• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention is directed to a heat recovery boiler in which exhaust gas is discharged from a gas turbine / diesel engine to a boiler duct to recover heat of the exhaust gas, and ammonia is injected into the exhaust gas and mixed to reduce nitrogen oxides contained in the exhaust gas. A recovery arrangement comprising a horizontally installed boiler duct having an internal hollow portion in which exhaust gas flows from an upstream side to a downstream side, and a superheater, an evaporator, a denitrification reactor, and an economizer disposed in an order from the upstream side to the downstream side of the exhaust gas flow in the boiler duct; It's about a boiler. A drum is arranged outside the boiler duct and connected to the downcomer and evaporator extending from the drum to the boiler duct. The ammonia injector is arranged inside the boiler duct for injecting ammonia and is disposed upstream of the evaporator so as to be close to the downcomer on either of the upstream and downstream sides of the downcomer.
    公开号:KR19990036949A
    申请号:KR1019980042062
    申请日:1998-10-08
    公开日:1999-05-25
    发明作者:히데아끼 시마다；노리히데 에가미；다까유끼 나가시마
    申请人:오카모토 세이시；도시바 마이크로일렉트로닉스 가부시키가이샤；
    IPC主号:
    专利说明:

    Heat recovery boiler
    The present invention relates to an exhaust heat recovery boiler, and more particularly, to being able to reduce and remove nitrogen oxides (NOx) contained in exhaust gas.
    In recent years, in order to improve the efficiency of power generation from the viewpoint of energy conservation, in addition to power generation by a gas turbine, a steam is generated by recovering an arrangement of exhaust gas of a gas turbine, and a power generation by a steam turbine using generated steam is performed. There is a tendency to adopt cycle power generation. In addition, multi-cycle power plants tend to be larger in order to improve power generation efficiency and power output.
    In a combined cycle power plant, a heat recovery boiler is employed to recover the heat and produce steam. The heat recovery boiler recovers heat of exhaust gas discharged from a prime mover such as a gas turbine, and generates and supplies driving steam and process steam hot water for the steam turbine. In addition, in consideration of environmental protection, the heat recovery boiler includes a denitrator for reducing harmful nitrogen oxides contained in the exhaust gas. In particular, in recent years, there is a tendency to install a high performance denitrifier in a heat recovery boiler capable of removing more than 90% of the nitrogen oxide contained in the exhaust gas.
    A conventional heat recovery boiler will be described below with reference to FIG. 22 which is a schematic side view of the heat recovery boiler and FIG. 23 which is a plan view of the ammonia injection unit (apparatus) of the heat recovery boiler.
    As shown in these figures, the horizontal natural circulation heat recovery boiler is a reheat dual pressure boiler. In the boiler duct 14, a high pressure secondary superheater 15, a reheater 16, a high pressure primary superheater 13, a high pressure evaporator 4, a low pressure superheater 17, a high pressure economizer 18, a low pressure evaporator 19 and heat transfer tubes of the low pressure economizer 20 are provided, which are continuously installed in the boiler duct from the upstream side to the downstream side along the arrangement gas flow direction in the above-described order. In the boiler duct 14, an ammonia injection unit 1 and a NOx removal reactor 5 are provided, and a high pressure drum 6 and a low pressure drum 21 are provided at the upper part of the boiler. Reference numeral 2 denotes an ammonia injection part supporting member, reference numeral 3 denotes a high pressure drum down tube, reference numeral 7 denotes an ammonia injection tube, and reference numeral 8 denotes an ammonia injection nozzle.
    Next, the operation of the above heat recovery boiler will be described.
    The exhaust gas flowing into the heat recovery boiler passes continuously through the high pressure secondary superheater 15, the reheater 16, and the high pressure primary superheater 13, and is mixed with ammonia in the ammonia injection unit 1. After the exhaust gas passes through the high pressure evaporator 4, the nitrogen oxide contained in the exhaust gas is removed by a NOx removal reactor (denitration reactor or denitrifier) 5 including a catalyst layer for promoting a reduction reaction. Removed. Further, the exhaust gas continuously passes through the low pressure superheater 17, the high pressure economizer 18, the low pressure economizer 19, and the low pressure economizer 20, and then is discharged to the atmosphere.
    An ammonia injection section 1 of the heat recovery boiler is arranged on the upstream side of the high pressure evaporator 4 with respect to the exhaust gas flow direction. In addition, the ammonia needs to be uniformly mixed with the exhaust gas, so that the high-pressure evaporator 4 is inserted between the injection unit 1 and the denitrification reactor 5 so that the ammonia injection unit 1 is denitrated reactor 5 In a position somewhat isolated from When passing through the high-pressure evaporator 4 in which many heat pipes are arranged regularly, ammonia and exhaust gas are evenly arranged. Ammonia is oxidized at temperatures above 490 ° C. to produce nitrogen oxides. For this reason, it is not desirable to thoroughly maintain NOx removal efficiency. Accordingly, an appropriate exhaust gas temperature is required, and in order to satisfy these conditions, the ammonia injection unit 1 is disposed on the downstream side of the high pressure primary superheater 13 and the upstream side of the high pressure evaporator 4 from the discharge gas flow direction. And the planned gas temperature is approximately 470 ° C. In this way, the harmful nitrogen oxides contained in the exhaust gas in the heat recovery boiler are removed during the heat exchange by the heat transfer tube.
    FIG. 24 is a diagram illustrating the ammonia injection portion of FIG. 22 when viewed from the discharge gas flow direction. FIG.
    In FIG. 24, the ammonia injection unit 1 includes an ammonia injection tube 7, an ammonia injection unit supporting member 2, and a plurality of ammonia injection nozzles 8 formed in the ammonia injection tube 7. The ammonia is mixed in the air and in the mixer 22, and passes through the ammonia injection inlet connecting pipe 23, the ammonia injection header 24 and the ammonia injection inlet pipe 25, and thus the ammonia injection support member ( It flows into the ammonia injection pipe 7 supported by 2). Ammonia flowing into the ammonia injection tube 7 is injected from a plurality of ammonia injection nozzles 8 provided on the ammonia injection tube 7 and mixed with the exhaust gas. These many ammonia injection nozzles 8 are vertically alternately installed on the ammonia injection tube 7 so that ammonia is uniformly mixed with the exhaust gas. In addition, the flow rate of ammonia is controlled by the ammonia flow control valve 26 so that ammonia is uniformly mixed with the exhaust gas. As described above, the ammonia injection unit is configured in such a way that ammonia is uniformly injected from the boiler duct to the entire part of the exhaust gas.
    As mentioned above, the combined cycle power plant tends to be large in capacity, and for this reason, the heat recovery boiler is also enlarged. This has led to an increase in installation space, cost and cost per power. In order to avoid the above disadvantages, it is necessary to reduce the space of the heat recovery boiler and to design a low cost. The conventional heat recovery boiler requires a large space around the ammonia injection unit and the drum downcomer, thereby increasing the total length of the boiler.
    In addition, the combined cycle power plant is large in capacity, thereby increasing the gas turbine output power while raising the exhaust gas temperature. Therefore, the heat recovery boiler also tends to be high in temperature and large in capacity. For this reason, the heat recovery boiler must include a high performance denitrifier from the viewpoint of environmental conservation.
    However, in the conventional heat recovery boiler, the exhaust gas temperature is increased, and the temperature of the ammonia injection unit is increased in accordance with a system for supplying cooling steam to the gas turbine. For this reason, there is a possibility that ammonia injection is not performed at an appropriate temperature. In other words, there is a problem that it is difficult to realize high NOx removal efficiency in a high temperature and high capacity heat recovery boiler.
    An object of the present invention is to eliminate the defects or obstacles encountered in the prior art, and by placing the ammonia injection unit in an optimum position, it is possible to reduce and efficiently utilize the installation space for the heat recovery boiler, and to provide a high temperature and high capacity heat recovery boiler. Therefore, the present invention provides a heat recovery boiler capable of effectively removing nitrogen oxides contained in exhaust gas.
    1 is a side view showing an ammonia injection unit (apparatus) according to a first embodiment of the present invention.
    2 is a plan view of the ammonia injection unit seen from arrow II-II of FIG. 1;
    FIG. 3 is a view showing the ammonia jet shown in FIG. 1 or FIG. 11 as viewed in the discharge gas flow direction (arrow III). FIG.
    4 is a side view showing an ammonia injection part according to a modification of the first embodiment of the present invention.
    FIG. 5 is a plan view illustrating the ammonia injection unit seen from arrow V-V of FIG. 4.
    6 is a side view showing an ammonia injection unit according to a second embodiment of the present invention.
    FIG. 7 is a plan view of the ammonia spray unit seen from the arrow VIII-VIII of FIG. 6; FIG.
    FIG. 8 is a view showing the ammonia spray unit shown in FIG. 6 seen from the discharge gas flow direction (arrow V). FIG.
    9 is a side view showing an ammonia injection part according to a modification of the second embodiment of the present invention.
    FIG. 10 is a plan view illustrating the ammonia spray unit seen from the arrow VIII-VIII in FIG. 9. FIG.
    11 is a side view showing an ammonia injection unit according to a third embodiment of the present invention.
    FIG. 12 is a plan view of the ammonia injection unit viewed from arrow XII-XII of FIG. 11. FIG.
    It is a side view which shows the ammonia injection part by the modification of the 3rd Example of this invention.
    14 is a plan view of the ammonia injection unit seen from arrows XIV-XIV of FIG. 13.
    Fig. 15 is a side view showing an ammonia injection part according to the fourth embodiment of the present invention.
    FIG. 16 is a plan view illustrating the ammonia injection unit seen from arrows VI-VI of FIG. 15. FIG.
    Fig. 17 is a side view showing an ammonia injection part according to a modification of the fourth embodiment of the present invention.
    FIG. 18 is a plan view of the ammonia spray unit seen from the arrow VIII-VIII of FIG. 17; FIG.
    Fig. 19 is a side view showing an ammonia injection part according to the fifth embodiment of the present invention.
    Fig. 20 is a plan view showing the ammonia jet portion shown in Fig. 19 when viewed in the discharge gas flow direction (arrow VIII).
    21 is a side view showing an ammonia injection unit according to a sixth embodiment of the present invention.
    22 is a side view schematically showing a conventional heat recovery boiler.
    FIG. 23 is a plan view illustrating the ammonia spray unit seen from arrows XIII-XIII of FIG. 22.
    FIG. 24 is a view showing an ammonia injection portion of the heat recovery boiler shown in FIG. 23 when viewed from the discharge gas flow direction (arrow IV). FIG.
    According to one aspect of the present invention, the above and other objects of the present invention are that the exhaust gas is discharged from the gas turbine / diesel engine to the boiler duct to recover the heat of the exhaust gas, and the ammonia is injected into the exhaust gas and mixed with the oxidation contained in the exhaust gas. In a heat recovery boiler for reducing nitrogen,
    A horizontally installed boiler duct having an inner hollow portion in which exhaust gas flows from the upstream side to the downstream side;
    A superheater disposed upstream of the exhaust gas flow inside the boiler duct;
    An evaporator disposed downstream of the superheater;
    A denitrification reactor disposed downstream of the evaporator;
    An economizer disposed downstream of the evaporator;
    A drum disposed outside the boiler duct and connected to the evaporator;
    Downcomer devices extending from drums to boiler ducts; And
    An ammonia spraying device disposed inside the boiler duct for injecting ammonia,
    The ammonia injector is achieved by providing a heat recovery boiler, which is arranged upstream of the evaporator so as to be close to the downcomer on either upstream or downstream of the downcomer.
    According to another aspect of the present invention, an arrangement is provided in which exhaust gas is discharged from a gas turbine / diesel engine to a boiler duct to recover heat of the exhaust gas, and ammonia is injected into the exhaust gas and mixed to reduce nitrogen oxides contained in the exhaust gas. In a recovery boiler,
    A horizontally installed boiler duct having an inner hollow portion in which exhaust gas flows from the upstream side to the downstream side;
    A superheater disposed upstream of the exhaust gas flow inside the boiler duct;
    An evaporator device disposed downstream of the superheater and including a primary evaporator and a secondary evaporator disposed downstream of the primary evaporator;
    A denitrification reactor disposed downstream of the secondary evaporator;
    An economizer disposed downstream of the evaporator device;
    A drum disposed outside the boiler duct and connected to the primary and secondary evaporators;
    Downcomer devices extending from drums to boiler ducts; And
    An ammonia spraying device disposed inside the boiler duct for injecting ammonia,
    The ammonia injector and the downcomer is disposed between the primary and secondary evaporators, and the ammonia injector is disposed close to the downcomer on any one of upstream and downstream of the downcomer. An array recovery boiler is provided.
    According to another aspect of the present invention, exhaust gas is discharged from a gas turbine / diesel engine to a boiler duct to recover heat of the exhaust gas, and ammonia is injected into the exhaust gas and mixed to reduce the nitrogen oxide contained in the exhaust gas. In the heat recovery boiler,
    A horizontally installed boiler duct having an inner hollow portion in which exhaust gas flows from the upstream side to the downstream side;
    A superheater disposed upstream of the exhaust gas flow inside the boiler duct;
    An evaporator disposed downstream of the superheater;
    A denitrification reactor disposed downstream of the evaporator;
    An economizer disposed downstream of the superheater;
    A drum disposed outside the boiler duct and connected to the evaporator;
    Downcomer devices extending from drums to boiler ducts; And
    An ammonia injector disposed inside the boiler duct for injecting ammonia,
    The evaporator is composed of a plurality of heat pipes arranged in parallel to each other, the ammonia injection device is provided in parallel with the heat pipes and the upper and lower ends are supported by the upper and lower headers provided by the heat recovery boiler do.
    According to another aspect of the present invention, exhaust gas is discharged from a gas turbine / diesel engine to a boiler duct to recover heat of the exhaust gas, and ammonia is injected into the exhaust gas and mixed to reduce the nitrogen oxide contained in the exhaust gas. In the heat recovery boiler,
    A horizontally installed boiler duct having an inner hollow portion in which exhaust gas flows from the upstream side to the downstream side;
    A superheater disposed upstream of the exhaust gas flow inside the boiler duct;
    An evaporator disposed downstream of the superheater;
    A denitrification reactor disposed downstream of the evaporator;
    An economizer disposed downstream of the superheater;
    A drum disposed outside the boiler and connected to the evaporator;
    Downcomer devices extending from drums to boiler ducts; And
    An ammonia spraying device disposed inside the boiler duct for injecting ammonia,
    The ammonia injector is disposed upstream of the evaporator and is disposed between the downcomer and the superheater, the upper and lower ends of which are supported by upper and lower headers.
    In a preferred embodiment of the above various aspects, the ammonia spraying device is arranged on the downstream or upstream side of the downcomer device.
    The ammonia injector includes a plurality of ammonia injectors, a plurality of ammonia injector support members, the downcomer device comprises a plurality of downcomers and a plurality of ammonia injectors, and the ammonia injector support members are provided for the exhaust gas flow. It is arranged parallel to the downcomer. The ammonia injection nozzles are formed in two ammonia injection pipes arranged at the same level with respect to the discharge gas flow, and the injection nozzles formed in one ammonia injection pipe and the injection nozzles formed in the other ammonia injection pipe are alternately arranged in the discharge gas flow direction. The spray nozzle is formed in such a way that it is.
    The ammonia injection pipe support members are respectively disposed between adjacent downcomers. The ammonia injection pipe support member may be attached to the downcomer. The downcomer device may function in common as the ammonia injection pipe support member.
    The evaporation device is composed of a plurality of heat transfer tubes arranged in parallel with each other.
    According to the heat recovery boiler of the present invention described above, the ammonia injection device (part) is disposed at the same position as the drum downcomer device when viewed from the heat recovery boiler. This reduces the size in the direction of the exhaust gas flow of the heat recovery boiler, and thus a compact heat recovery boiler can be provided which can save space at low cost. In addition, since the ammonia injection unit is supported by the downcomer, the above effect can be increased.
    The evaporator may also be separated, and an ammonia injection device and a boiler downpipe device are inserted between the separate evaporators. Accordingly, even if the exhaust gas temperature rises as the combustion temperature of the gas turbine / diesel engine rises, ammonia may be injected after heat exchange to reach an appropriate temperature to remove nitrogen oxides. Space savings are thus achieved in the heat recovery boiler, and the heat recovery boiler is provided at low cost. In addition, nitrogen oxide is sufficiently removed in the high temperature and large capacity heat recovery boilers compared to the conventional arrangement, and environmental protection may be sufficiently considered in the high temperature and large capacity heat recovery boilers.
    In addition, since the downcomer is not disposed on the tube group outlet of the vaporizer, the mixed gas flows smoothly into the denitrifier, and the catalyst works effectively. Therefore, compared with the conventional case, even the same amount of catalyst can improve the NOx removal efficiency.
    The nature and characteristics of the present invention will become more apparent from the following description of the preferred embodiments with reference to the drawings.
    (Example)
    DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, and the same reference numerals are given to the devices or members corresponding to those shown in FIG. Reference is made only to the essential part of the heat recovery boiler of the invention.
    1 to 3 are diagrams illustrating an ammonia injection unit according to the first embodiment of the present invention.
    As shown in these figures, in the first embodiment, an ammonia injection section (apparatus) 1 is located on the upstream side of the high pressure evaporator 4 with respect to the discharge gas flow direction in the boiler duct 14 and also in the high pressure drum 6. Is disposed at the same position as the high-pressure drum down tube of a), and is usually arranged such that a plurality of down tubes extend in parallel to each other. In addition, the high-pressure drum down pipe 3 and the ammonia injection part supporting member 2 are arranged in parallel with the boiler horizontal direction, and are disposed perpendicular to the exhaust gas flow direction of the boiler duct. The ammonia injection unit 1 includes a plurality of pairs of ammonia injection pipes 71 and 72 including two pipes in which each pair is arranged side by side, a plurality of ammonia injection unit support members 2, and a plurality of ammonia injection pipes formed in each of the ammonia injection pipes. Ammonia jet nozzle. The two ammonia injection pipes 71 and 72 are arranged parallel to each other in the discharge gas flow direction. The ammonia injection nozzles 8 are alternately provided on the ammonia injection pipes 71 and 72 in the discharge gas flow direction. The exhaust gas is thus mixed with ammonia in the ammonia injection section 1, passed through the high pressure evaporator 4, and then nitrogen oxides are removed by the NOx removal reactor 5 which functions as a denitrification reactor or denitrifier.
    According to this embodiment, the ammonia injection section 1 is located on the upstream side of the high pressure evaporator 4 with respect to the discharge gas flow direction in the boiler duct 14 and also on the high pressure drum downcomer 3 of the high pressure drum 6. And are placed in the same position. Accordingly, the space can be reduced in the direction of the exhaust gas flow. In addition, nitrogen oxide is discharged from the ammonia injection unit 1 through the high-pressure evaporator 4 composed of a plurality of heat transfer tubes arranged in parallel to the denitrification reactor 5 so that ammonia and the exhaust gas are uniformly mixed with each other. Can be easily removed. In addition, since the high pressure drum down pipe 3 is not installed on the pipe group outlet of the high pressure evaporator 4, the mixed gas flows smoothly into the denitrification reactor 5, so that the catalyst is effectively activated to add the same amount as compared to the conventional example. Even if the NOx removal efficiency can be improved.
    4 and 5 are diagrams showing an ammonia injection unit according to a modification of the first embodiment of the present invention.
    As shown in these figures, this embodiment shows that the ammonia injection pipes 71 and 72 and the ammonia injection nozzles 8 are located on the downstream side of the high pressure drum down pipe 3 with respect to the discharge gas flow direction in the boiler duct 14. It differs from the 1st Embodiment in that it is arrange | positioned to the other structure is basically the same as that of 1st Embodiment. Accordingly, the same reference numerals are used to denote the same components or devices as those in the first embodiment, and redundant descriptions are omitted.
    According to this embodiment, the ammonia injection part 1 and the high pressure drum down pipe 3 are arrange | positioned at the same position, when looking at the side surface of a heat recovery boiler. Accordingly, the space can be reduced in the direction of the exhaust gas flow. In addition, since the exhaust gas flows from the ammonia injection unit 1 to the denitrification reactor 5 through the high pressure evaporator 4, nitrogen oxides can be easily removed in a state where ammonia and the exhaust gas are uniformly mixed with each other. In addition, since the high pressure drum down pipe 3 is not installed on the pipe group outlet of the high pressure evaporator 4, the mixed gas flows smoothly into the denitrification reactor 5, so that the catalyst is effectively activated to add the same amount as compared to the conventional example. Even if the NOx removal efficiency can be improved.
    6 to 8 are diagrams showing the ammonia injection unit according to the second embodiment of the present invention.
    As shown in these figures, this second embodiment differs from the first embodiment in that the high pressure drum downcomer 3 functions as the ammonia injector support member 2 in order to remove the ammonia injector support member. The other configuration is the same as that of the first embodiment. Accordingly, the same reference numerals are used to denote the same components or devices as those in the first embodiment, and redundant descriptions are omitted.
    In this second embodiment, as in the first embodiment, the exhaust gas is mixed with ammonia in the ammonia injection unit 1, and after passing through the high pressure evaporator 4, nitrogen oxide is removed by the denitrification reactor 5. In addition, since the high pressure drum downcomer 3 functions as the ammonia injector support member 2, the ammonia injector support member may be eliminated. Thus, the number of components can be reduced.
    9 and 10 are diagrams showing an ammonia injection unit according to a modification of the second embodiment of the present invention.
    As shown in these figures, this embodiment shows that the ammonia injection pipes 71 and 72 and the ammonia injection nozzles 8 are located on the downstream side of the high pressure drum down pipe 3 with respect to the discharge gas flow direction in the boiler duct 14. It differs from the 2nd Embodiment in that it is arrange | positioned to the other structure is the same as that of 1st Embodiment. Accordingly, the same reference numerals are used to denote the same components or devices as those in the first embodiment, and redundant descriptions are omitted.
    According to this embodiment, the ammonia injection part 1 and the high pressure drum down pipe 3 are arrange | positioned at the same position, when looking at the side surface of a heat recovery boiler. Accordingly, the space can be reduced in the direction of the exhaust gas flow. In addition, since the exhaust gas flows from the ammonia injection unit 1 to the denitrification reactor 5 through the high pressure evaporator 4, nitrogen oxides can be easily removed in a state where ammonia and the exhaust gas are uniformly mixed with each other. In addition, since the high pressure drum down pipe 3 is not installed on the pipe group outlet of the high pressure evaporator 4, the mixed gas flows smoothly into the denitrification reactor 5, so that the catalyst is effectively activated to add the same amount as compared to the conventional example. Even if the NOx removal efficiency can be improved.
    11 and 12 are views illustrating an ammonia injection unit according to a third embodiment of the present invention.
    As shown in these figures, in this embodiment, the high pressure evaporator 4 is divided into a first high pressure evaporator 9 and a second high pressure evaporator 10, and an ammonia injection unit 1 and a high pressure drum down tube 3 are provided. This embodiment differs from the first embodiment in that it is inserted between these first and second high pressure evaporators 9 and 10, and the other configuration is the same as in the first embodiment. Accordingly, the same reference numerals are used to denote the same components or devices as those in the first embodiment, and redundant descriptions are omitted.
    According to this third embodiment, the ammonia injection section 1 and the high pressure drum downcomer 3 are arranged at the same position as the first and second embodiments when the side view of the heat recovery boiler is viewed. In addition, the high pressure drum down tube 3 and the ammonia injection part supporting member 2 are arranged in parallel in the horizontal direction as in the first embodiment. The exhaust gas passes through the first high pressure evaporator 9 and mixes with ammonia in the ammonia injection unit 1. In addition, after the exhaust gas passes through the second evaporator 10, the nitrogen oxides are removed by the denitrification reactor 5. Therefore, according to the third embodiment, the NOx removal efficiency can be improved as compared with the conventional case.
    13 and 14 are diagrams showing an ammonia injection unit according to a modification of the third embodiment of the present invention.
    As shown in these figures, this embodiment shows that the ammonia injection pipes 71 and 72 and the ammonia injection nozzles 8 are located on the downstream side of the high pressure drum down pipe 3 with respect to the discharge gas flow direction in the boiler duct 14. It differs from the 3rd Embodiment in that it is arrange | positioned at the other structure is the same as that of 1st Embodiment. Accordingly, the same reference numerals are used to denote the same components or devices as those in the first embodiment, and redundant descriptions are omitted.
    According to this embodiment, since the ammonia injection pipes 71 and 72 and the ammonia injection nozzle 8 are arranged on the downstream side of the high pressure drum down pipe 3 with respect to the discharge gas flow direction, the arrangement in the discharge gas flow direction is performed. In addition to the space reduction of the recovery boiler, before the exhaust gas reaches the ammonia injection section 1, the exhaust gas reaches the ammonia injection section 1 after the heat exchange has been performed several times by passing more heat transfer tube groups than before.
    In addition, if the exhaust gas temperature at the inlet of the waste heat recovery boiler is higher than the conventional one, the temperature difference between the waste heat recovery boiler and the ammonia injector 1 becomes large, so that the exhaust gas drops to an appropriate temperature so that the exhaust gas is ammonia injector 1. May be directed to. Therefore, the heat recovery efficiency and the denitrification efficiency can be increased.
    15 and 16 are diagrams illustrating an ammonia injection unit according to a fourth embodiment of the present invention.
    As shown in these figures, this fourth embodiment differs from the third embodiment in that the high pressure drum downcomer 3 also functions as the ammonia injector support member 2 to remove the ammonia injector support member. , Other configurations are the same as those of the first embodiment. Accordingly, the same reference numerals are used to denote the same components or devices as those in the first embodiment, and redundant descriptions are omitted.
    In the fourth embodiment, as in the third embodiment, the exhaust gas is mixed with ammonia in the ammonia injection section 1 and passed through the high pressure evaporator 4, after which the nitric oxide is removed by the denitrification reactor 5. The high pressure drum downcomer 3 also functions as the ammonia injector support member 2 so that the ammonia injector support member can be removed. Thus, the number of components can be reduced.
    17 and 18 are diagrams showing an ammonia injection unit according to a modification of the fourth embodiment of the present invention.
    As shown in these figures, this embodiment shows that the ammonia injection pipes 71 and 72 and the ammonia injection nozzles 8 are located on the downstream side of the high pressure drum down pipe 3 with respect to the discharge gas flow direction in the boiler duct 14. It differs from the 4th Embodiment in the point which is arrange | positioned at the other structure is the same as that of 1st Embodiment. Accordingly, the same reference numerals are used to denote the same components or devices as those in the first embodiment, and redundant descriptions are omitted.
    In this embodiment, as in the third embodiment, the heat recovery and NOx removal efficiency can be improved, and since the support member can be removed, the number of components can be reduced.
    19 and 20 are diagrams illustrating an ammonia injection unit according to a fifth embodiment of the present invention.
    As shown in these figures, in this fifth embodiment, the ammonia injection unit 1 is configured in such a manner that the ammonia injection tube 7 is connected using the upper tube header 11 and the lower tube header 12. Furthermore, the ammonia injection part 1 is inserted from the vertical direction, and is arrange | positioned on the interposition part of the high pressure evaporator 4 comprised from the some heat exchanger tube as mentioned above.
    According to this fifth embodiment, the ammonia injection portion can be positioned from the vertical direction by using the upper and lower tube headers 11 and 12 in the ammonia injection portion 1 as heat transfer tubes. In addition, as in the third and fourth embodiments, space is saved in the exhaust gas flow direction, and ammonia injection can be performed at an appropriate exhaust gas temperature.
    21 is a view showing an ammonia injection unit according to a sixth embodiment of the present invention.
    As shown in FIG. 21, similarly to the fifth embodiment, the ammonia injection unit 1 is configured in such a manner that the ammonia injection tube 7 is connected using the upper tube header 11 and the lower tube header 12. As shown in FIG. An ammonia injection section 1 is also inserted from the vertical direction and disposed on the downstream side of the high pressure primary superheater 13 with respect to the discharge gas flow direction. In addition, the ammonia injection tube 7 and the ammonia injection nozzle 8 have the same arrangement | positioning as 5th Example of FIG.
    According to this sixth embodiment, similarly to the fifth embodiment, the ammonia injection section 1 is constructed using the upper and lower pipe headers 11 and 12. Therefore, space is saved in the direction of the exhaust gas flow, and ammonia injection can be performed at an appropriate exhaust gas temperature.
    Moreover, the present invention is not limited to the above embodiments, and it is obvious that various changes, modifications, and combinations are possible without departing from the scope of the claims.
    According to the heat recovery boiler of the present invention described above, the ammonia injection device (part) is disposed at the same position as the drum downcomer device as viewed from the heat recovery boiler. This reduces the size in the direction of the exhaust gas flow of the heat recovery boiler, and thus a compact heat recovery boiler can be provided which can save space at low cost. In addition, since the ammonia injection unit is supported by the downcomer, the above effect can be increased.
    The evaporator may also be separated, and an ammonia injection device and a boiler downpipe device are inserted between the separate evaporators. Accordingly, even if the exhaust gas temperature rises as the combustion temperature of the gas turbine / diesel engine rises, ammonia may be injected after heat exchange to reach an appropriate temperature to remove nitrogen oxides. Space savings are thus achieved in the heat recovery boiler, and the heat recovery boiler is provided at low cost. Nitrogen oxides are also sufficiently removed in high temperature and large capacity heat recovery boilers compared to conventional batches, and environmental protection can be fully considered in high temperature and large capacity heat recovery boilers.
    In addition, since the downcomer is not disposed on the tube group outlet of the vaporizer, the mixed gas flows smoothly into the denitrifier, and the catalyst works effectively. Therefore, compared with the conventional case, even the same amount of catalyst can improve the NOx removal efficiency.
    权利要求:
    Claims (20)
    [1" claim-type="Currently amended] In a heat recovery boiler in which exhaust gas is discharged from a gas turbine / diesel engine to a boiler duct to recover heat of the exhaust gas, and ammonia is injected into the exhaust gas and mixed to reduce nitrogen oxides contained in the exhaust gas.
    A horizontally installed boiler duct having an inner hollow portion in which exhaust gas flows from the upstream side to the downstream side;
    A superheater disposed upstream of the exhaust gas flow inside the boiler duct;
    An evaporator disposed downstream of the superheater;
    A denitrification reactor disposed downstream of the evaporator;
    An economizer disposed downstream of the evaporator;
    A drum disposed outside the boiler duct and connected to the evaporator;
    Downcomer devices extending from drums to boiler ducts; And
    An ammonia injector disposed inside the boiler duct for injecting ammonia,
    And the ammonia injector is arranged upstream of the evaporator so as to be close to the downcomer on any one of upstream and downstream of the downcomer.
    [2" claim-type="Currently amended] The method of claim 1,
    The ammonia injector is disposed in the upstream side of the downcomer, the heat recovery boiler.
    [3" claim-type="Currently amended] The method of claim 1,
    And the ammonia injector is disposed downstream of the downcomer.
    [4" claim-type="Currently amended] The method of claim 1,
    The ammonia injection device includes a plurality of ammonia injection pipes, a plurality of ammonia injection pipe support members, and a plurality of ammonia injection nozzles, and the downcomer device includes a plurality of down pipes, and the ammonia injection pipe support member includes a discharge gas. A heat recovery boiler, characterized in that it is disposed parallel to the downcomer with respect to the flow.
    [5" claim-type="Currently amended] The method of claim 4, wherein
    And the ammonia injection nozzle is formed in a plurality of ammonia injection pipes.
    [6" claim-type="Currently amended] The method of claim 4, wherein
    And the ammonia injection pipe support members are disposed between adjacent downcomers respectively.
    [7" claim-type="Currently amended] The method of claim 4, wherein
    The ammonia injection pipe support member is a heat recovery boiler, characterized in that mounted on the down pipe.
    [8" claim-type="Currently amended] The method of claim 4, wherein
    And said downcoming pipe functions in common as said ammonia injection pipe support member.
    [9" claim-type="Currently amended] The method of claim 1,
    The evaporator is a heat recovery boiler, characterized in that consisting of a plurality of heat pipes arranged to extend in parallel to each other.
    [10" claim-type="Currently amended] In a heat recovery boiler in which exhaust gas is discharged from a gas turbine / diesel engine to a boiler duct to recover heat of the exhaust gas, and ammonia is injected into the exhaust gas and mixed to reduce nitrogen oxides contained in the exhaust gas.
    A horizontally installed boiler duct having an inner hollow portion in which exhaust gas flows from the upstream side to the downstream side;
    A superheater disposed upstream of the exhaust gas flow inside the boiler duct;
    An evaporator device disposed downstream of the superheater and including a primary evaporator and a secondary evaporator disposed downstream of the primary evaporator;
    A denitrification reactor disposed downstream of the secondary evaporator;
    An economizer disposed downstream of the evaporator device;
    A drum disposed outside the boiler duct and connected to the primary and secondary evaporators;
    Downcomer devices extending from drums to boiler ducts; And
    An ammonia injector disposed inside the boiler duct for injecting ammonia,
    The ammonia injector and the downcomer is disposed between the primary and secondary evaporators, and the ammonia injector is disposed close to the downcomer on any one of upstream and downstream of the downcomer. Heat recovery boiler.
    [11" claim-type="Currently amended] The method of claim 10,
    The ammonia injector is disposed in the upstream side of the downcomer, the heat recovery boiler.
    [12" claim-type="Currently amended] The method of claim 10,
    And the ammonia injector is disposed downstream of the downcomer.
    [13" claim-type="Currently amended] The method of claim 10,
    The ammonia injection device includes a plurality of ammonia injection pipes, a plurality of ammonia injection pipe support members, and a plurality of ammonia injection nozzles, and the downcomer device includes a plurality of down pipes, and the ammonia injection pipe support member includes a discharge gas. A heat recovery boiler, characterized in that it is disposed parallel to the downcomer with respect to the flow.
    [14" claim-type="Currently amended] The method of claim 13,
    And the ammonia injection nozzle is formed in a plurality of ammonia injection pipes.
    [15" claim-type="Currently amended] The method of claim 13,
    And the ammonia injection pipe support members are disposed between adjacent downcomers respectively.
    [16" claim-type="Currently amended] The method of claim 13,
    The ammonia injection pipe support member is a heat recovery boiler, characterized in that mounted on the down pipe.
    [17" claim-type="Currently amended] The method of claim 13,
    And said downcoming pipe functions in common as said ammonia injection pipe support member.
    [18" claim-type="Currently amended] In a heat recovery boiler in which exhaust gas is discharged from a gas turbine / diesel engine to a boiler duct to recover heat of the exhaust gas, and ammonia is injected into the exhaust gas and mixed to reduce nitrogen oxides contained in the exhaust gas.
    A horizontally installed boiler duct having an inner hollow portion in which exhaust gas flows from the upstream side to the downstream side;
    A superheater disposed upstream of the exhaust gas flow inside the boiler duct;
    An evaporator disposed downstream of the superheater;
    A denitrification reactor disposed downstream of the evaporator;
    An economizer disposed downstream of the superheater;
    A drum disposed outside the boiler duct and connected to the evaporator;
    Downcomer devices extending from drums to boiler ducts; And
    An ammonia injector disposed inside the boiler duct for injecting ammonia,
    The evaporator is composed of a plurality of heat pipes arranged in parallel to each other, the ammonia injection device is disposed in parallel to the heat pipes and the upper and lower ends are supported by the upper and lower headers.
    [19" claim-type="Currently amended] The method of claim 18,
    And the ammonia injector is disposed downstream of the downcomer.
    [20" claim-type="Currently amended] In a heat recovery boiler in which exhaust gas is discharged from a gas turbine / diesel engine to a boiler duct to recover heat of the exhaust gas, and ammonia is injected into the exhaust gas and mixed to reduce nitrogen oxides contained in the exhaust gas.
    A horizontally installed boiler duct having an inner hollow portion in which exhaust gas flows from the upstream side to the downstream side;
    A superheater disposed upstream of the exhaust gas flow inside the boiler duct;
    An evaporator disposed downstream of the superheater;
    A denitrification reactor disposed downstream of the evaporator;
    An economizer disposed downstream of the superheater;
    A drum disposed outside the boiler and connected to the evaporator;
    Downcomer devices extending from drums to boiler ducts; And
    An ammonia injector disposed inside the boiler duct for injecting ammonia,
    And the ammonia injector is disposed upstream of the evaporator and disposed between the downcomer and the superheater, the upper and lower ends of which are supported by upper and lower headers.
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    同族专利:
    公开号 | 公开日
    AT260440T|2004-03-15|
    CN1158470C|2004-07-21|
    CA2249805C|2002-12-10|
    US6050226A|2000-04-18|
    US6334410B2|2002-01-01|
    CN1215818A|1999-05-05|
    EP0915288A3|2000-02-23|
    US20010000094A1|2001-04-05|
    TW421701B|2001-02-11|
    US6289850B1|2001-09-18|
    EP0915288A2|1999-05-12|
    US6435138B2|2002-08-20|
    CA2249805A1|1999-04-08|
    US20010035136A1|2001-11-01|
    JP3373771B2|2003-02-04|
    JPH11108334A|1999-04-23|
    EP0915288B1|2004-02-25|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1997-10-08|Priority to JP276203
    1997-10-08|Priority to JP27620397A
    1998-10-08|Application filed by 오카모토 세이시, 도시바 마이크로일렉트로닉스 가부시키가이샤
    1999-05-25|Publication of KR19990036949A
    2001-12-17|Application granted
    2001-12-17|Publication of KR100309959B1
    优先权:
    申请号 | 申请日 | 专利标题
    JP276203|1997-10-08|
    JP27620397A|JP3373771B2|1997-10-08|1997-10-08|Waste heat recovery boiler|
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