System for recovering sensible heat from molten slag

专利摘要:
The present invention relates to a system for recovering sensible heat of hot molten slag generated in a steel making process and a method for recovering the same. The molten slag sensible heat recovery system of the present invention comprises a pair roll 12 for discharging the molten slag 100 downward through the nip (N) to the slag plate 102 of a predetermined thickness (t); A housing 10 extending downward from the outside of the pair roll 12 along a traveling direction of the slag plate 102 discharged from the pair roll 12 to form a sealed space; An ejector (32) disposed below the housing (10) to discharge solidified and broken slag pieces (104) discharged from the pair roll (12) out of the housing (10); And a heat exchanger that blows gas into the lower portion of the housing 10 and draws gas out of the upper portion of the housing 10 to obtain heat from the slag 102 and 104. According to the present invention, it is possible to prevent the slag from sticking to the rotating vessel or the furnace wall while increasing the efficiency of the molten slag sensible heat recovery.
公开号:KR20040043029A
申请号:KR1020020071024
申请日:2002-11-15
公开日:2004-05-22
发明作者:송시명
申请人:주식회사 포스코；
IPC主号:

专利说明:

Sensible heat recovery system of molten slag {SYSTEM FOR RECOVERING SENSIBLE HEAT FROM MOLTEN SLAG}
[13] The present invention relates to a system for recovering sensible heat of hot molten slag generated in a steel making process and a method for recovering the same.
[14] In the steelmaking process of steel mills, hot molten slag is inevitably generated as a by-product. There are a number of techniques for recovering sensible heat released from such hot slag.
[15] An example of such sensible heat recovery technology will be described below. A cup-shaped container made of a refractory rotating by a driving force of a motor is mounted inside a cylindrical furnace composed of an iron shell and a refractory, and a cradle for seating a container containing molten slag is installed on an upper portion of the cylindrical furnace. A vessel containing molten slag is placed in the cradle, and the lower nozzle of the vessel is opened so that the molten slag is discharged in an appropriate amount. When the hot molten slag enters the cup-shaped rotating container through the nozzle, it is spun toward the furnace wall under centrifugal force due to the rotation of the container. The molten slag attached to the furnace wall surface is cooled while losing heat by the large amount of circulating nitrogen gas flowing from the bottom of the furnace body. As the above process continues, the slag accumulated and cooled on the wall of the furnace body becomes bulky particles in the form of non-uniform film, which are dropped by the self load and fall down to the furnace body. The dropped slag particles are loaded in the lower part of the furnace and then discharged to the outside through the lower part of the furnace. On the other hand, the nitrogen gas obtained during the cooling of the slag is introduced into the heat exchanger to generate steam, so that the sensible heat of the slag can be used as an effective energy.
[16] However, the prior art as described above has the following problems. Since slag has a significantly low thermal conductivity, when the slag accumulatively attached to the wall of the furnace body becomes thick, only the outer surface of the slag is cooled, making it difficult to efficiently exchange heat with nitrogen gas. This reduces the sensible heat recovery efficiency. In addition, since the slag has a high viscosity, the slag attached to the furnace wall and the rotating container has a problem that does not easily fall off from them even after being sufficiently cooled.
[17] Therefore, the present invention has been made to overcome the above-mentioned problems of the prior art, an object of the present invention is to increase the efficiency of the recovery of molten slag sensitized molten slag sensible heat that can prevent the slag adhered to the rotating vessel or the furnace wall surface It is to provide a recovery system.
[1] 1 is a partially cutaway perspective view of a molten slag cooling apparatus according to a preferred embodiment of the present invention.
[2] 2 is a schematic side cross-sectional view for explaining a molten slag injection operation.
[3] Figure 3 is a partially cut away perspective view of the molten slag cooling apparatus according to another embodiment of the present invention.
[4] 4 is a conceptual diagram of a molten slag sensible heat recovery system according to the present invention.
[5] 5 is a flowchart of a molten slag sensible heat recovery process according to the present invention.
[6] <Explanation of symbols of main parts in drawings>
[7] 12: twin roll 16: slag conduit
[8] 20, 22 ': Side dam 24: Nitrogen gas outlet
[9] 30: nitrogen gas inlet 32: rotary valve
[10] 42: blower 44: boiler
[11] 100, 102, 104: slag 106: nitrogen gas
[12] 108: coolant
[18] According to an aspect of the present invention for achieving the above object of the present invention is provided a sensible heat recovery system of molten slag generated in the steelmaking process. The molten slag sensible heat recovery system comprises a pair of rolls for discharging the molten slag downward through the nip to a slag plate of a predetermined thickness; A housing extending downward from the outside of the pair of rolls along a traveling direction of the slag plate discharged from the pair of rolls to form a closed space; An ejector disposed below the housing to discharge solidified and broken slag pieces from the pair of rolls and out of the housing; And a heat exchanger which blows gas into the lower part of the housing and draws gas out of the upper part of the housing to obtain heat from the slag.
[19] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, but these embodiments do not limit or limit the present invention.
[20] 1 is a partially cutaway perspective view of a molten slag cooling apparatus according to a preferred embodiment of the present invention, Figure 2 is a schematic side cross-sectional view of the molten slag cooling apparatus for explaining the molten slag injection operation.
[21] 1 and 2, the molten slag cooling apparatus used in the molten slag sensible heat recovery system of the present invention consists of an upright box-shaped housing 10 having a wide upper portion, a reduced middle portion, and a wider lower portion. A pair of rolls 12 are mounted on the upper portion of the cooling device at predetermined intervals. The upper part of the housing 10 has a top plate 18 covering the upper side between the twin rolls 12 and a side plate 20 in the form of side dams covering a part of both sides, so that the molten slag 100 is disposed on the upper side between the twin rolls 12. To form a confined space for temporary storage.
[22] On the other hand, the space | interval between the above-mentioned pair rolls 12, ie, the nip N, is preferably set so that the thickness t of the slag plate 102 discharged therebetween is approximately 1 cm or less as described later. This is because if the thickness of the slag plate 102 is too thick, the thermal conductivity is lowered and the heat recovery efficiency is lowered. One of the pair of rolls 12 is moved back and forth by the hydraulic cylinder 35 connected to the rotary shaft 14 to adjust the nip (N). The hydraulic cylinder 35 may be coupled to any one of the pair rolls 12.
[23] The housing 10 below the twin roll 12 forms a slag plate accommodating portion 22 whose thickness gradually decreases. The slag plate accommodating part 22 passes nitrogen gas inflow into the housing 10 through the nitrogen gas inlet 30 under the housing 10 while passing the slag plate 102 passed between the pair rolls 12 downward. And a nitrogen gas outlet 24 for discharging the gas. It is preferable that the inlet 30 and the outlet 24 be provided with a net so that impurities from the outside do not flow in or small pieces of slag inside the housing 10 do not flow out. Meanwhile, although only the nitrogen gas outlet 24 of the front side is illustrated for convenience of illustration, the nitrogen gas outlet may also be installed on the rear surface of the slag plate accommodating part 22.
[24] The slag plate accommodating part 22 leads to the slag plate passage part 26 of the lower side, and the slag loading chamber 28 is provided below the slag plate passage part 26. The slag loading chamber 28 has a large internal space so that the slag pieces 104 separated from the slag plate 102 can be accumulated, and the nitrogen gas inlet 30 at the side is for discharging the slag pieces at the lower side. Rotary valve 32 is installed. The rotary valve 32 is rotated by an adjacent drive motor 34 using a rope or the like.
[25] Meanwhile, the slag container 36 containing the high temperature slag 100 generated in the steelmaking process is disposed above the slag cooling device. The slag container 36 is disposed in place by placing a trunnion, which is a protrusion formed on both sides, on a pair of cradles 40.
[26] Hereinafter, the cooling and discharging process of the molten slag 100 will be described.
[27] The molten slag 100 contained in the slag container 36 is introduced into the closed space between the pair rolls 12 through the conduit 16 when the valve (not shown) is opened. The upper side between the pair rolls 12 is sealed to prevent the sensible heat of the molten slag 100 from escaping to the outside.
[28] When the twin roll 12 is rotated in the direction of the arrow A by a rope or gear on the driving side (not shown) connected to the rotating shaft 14, the molten slag 100 is nip N between the twin rolls 12. It proceeds downward through the slag plate 102 of a predetermined thickness (t) by its viscosity.
[29] Meanwhile, the coolant 108 (refer to FIG. 4) flows into one end of the rotating shaft 14 of the double roll 12 and is discharged to the other end. This is to rapidly solidify the hot molten slag 100 in contact with the double roll 12. Since the cooling system of such a pair of rolls 12 is well known, its detailed description is omitted below.
[30] The slag plate 102 is gradually cooled by the nitrogen gas 106 blowing out from the bottom of the housing 10 while exiting the pair roll 12. In addition, when the slag plate 102 is gradually cooled, the slag plate 102 passes through the slag passage part 26 to reach the slag stacking chamber 28. The slag plate 102 falls into the slag loading chamber 28 in the form of slag pieces 104 by being cracked or broken by its own load in accordance with the vibration of the cooling device before reaching the slag loading chamber 28. In addition, even when the slag plate 102 reaches the slag stacking chamber 28 without being broken in advance, the slag plate 102 is easily brittle when collided with the slag pieces 104 or the bottom surface stacked under the stacking chamber 28 due to its brittleness. Stacked on (28).
[31] In this process, the nitrogen gas 106 introduced into the inlet 30 cools the slag pieces 104 accumulated in the loading chamber 28 and the descending slag plate 102 while rising inside the housing 10 and then heated. It is discharged out of the housing 10 through the furnace outlet 26. The use of the hot nitrogen gas 106 discharged out of the housing 10 will be described later with reference to FIG. 4.
[32] On the other hand, the slag pieces 104 accumulated in the loading chamber 28 are discharged out of the cooling device by the rotary valve 32 driven by the motor 34.
[33] 3 is a partially cutaway perspective view of the molten slag cooling apparatus according to another embodiment of the present invention.
[34] The molten slag cooling apparatus according to another embodiment of the present invention shown in FIG. 3 is substantially the same as the cooling apparatus of FIG. 1, but the flag receiving portion 22 ′ of the housing 10 has both sides of the pair roll 12. It differs in that it does not cover an end part. Therefore, the side dam 20 'installed at the upper ends of the pair roll 12 is different from the accommodating part 22' unlike the side plate 20 of FIG. Such a configuration has the advantage of simple manufacturing compared to the configuration of FIG.
[35] 4 is a conceptual diagram of a molten slag sensible heat recovery system according to the present invention.
[36] As described above, the hot nitrogen gas 106 obtained from the slag cooling device is supplied to a heat exchanger in the form of a boiler 44 through a pipe to heat water inside the boiler 44 to generate steam. The nitrogen gas 106 used in the sensible heat recovery process is introduced into the inlet 30 of the cooling device by the blower 42 again.
[37] Meanwhile, the coolant 108 used in the pair roll 12 is supplied to the boiler 44 through a pipe and is configured to increase the sensible heat recovery efficiency. When the amount of the coolant 108 used is small, water is supplied from the outside to the boiler 44.
[38] 5 is a flowchart of a molten slag sensible heat recovery process according to the present invention.
[39] First, the valve of the molten slag container 36 (not shown), the amount of molten slag 100 contained in the slag container 36 and the state of the pair roll 12 and the side plates or side dams 20 and 20 '( S1). If it is determined that these conditions are good, the valve in the lower slag container 36 is opened to discharge the molten slag 100 through the conduit 16 downward (S2), and the twin roll 12 is operated (S3). . The circulating nitrogen gas 106 is then introduced into the chiller housing 10 to cool the slag plate 102 and the slag pieces 104 in the loading chamber 28 and the hot nitrogen gas for sensible heat recovery. (106) is obtained (S4). Subsequently, the rotary valve 32 is operated to discharge the slag pieces 104 accumulated in the loading chamber 28 out of the chiller housing 10.
[40] According to the molten slag sensible heat recovery system according to the present invention as described above, the molten slag is made into a thin plate and cooled. This can achieve rapid cooling by increasing the slag surface area, and because it is formed into thin plates, the slag is sufficiently cooled to the center and the amount of heat recovered is increased. As a result, high heat recovery efficiency is obtained and energy saving effect is achieved.
[41] In addition, since the slag does not substantially contact other objects while being cooled, it is possible to prevent the slag from sticking to the furnace wall and the rotating container as seen in the prior art.
[42] Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art have various modifications of the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. And can be changed.

权利要求:
Claims (5)
[1" claim-type="Currently amended] A pair roll 12 which discharges the molten slag 100 generated in the steelmaking process downwardly through the nip N to the slag plate 102 having a predetermined thickness t;
A housing 10 extending downward from the outside of the pair roll 12 along a traveling direction of the slag plate 102 discharged from the pair roll 12 to form a sealed space;
An ejector (32) disposed below the housing (10) to discharge solidified and broken slag pieces (104) discharged from the pair roll (12) out of the housing (10); And
And a heat exchanger that blows gas into the lower portion of the housing and draws the gas out of the upper portion of the housing to obtain heat from the slag (102, 104).
[2" claim-type="Currently amended] The method of claim 1, wherein the heat exchanger
A gas inlet 30 disposed below the housing 10;
A blower 42 for blowing gas into the gas inlet 30;
A gas outlet (26) disposed adjacent to the lower side of the pair of rolls (12) to discharge hot gas from the housing (10); And
And a heater (44) for heating the hot gas from the gas outlet (26) for heating.
[3" claim-type="Currently amended] 3. The molten slag sensible heat recovery system according to claim 2, wherein the heater is a boiler (44) and uses cooling water (108) used to cool the pair of rolls (12).
[4" claim-type="Currently amended] The molten slag sensible heat recovery system according to claim 1, further comprising a pair of side dams (20, 20 ') extending upward from the vicinity of the nip (N) on both sides of the pair roll (12).
[5" claim-type="Currently amended] The molten slag sensible heat recovery system according to claim 1, wherein the gas is nitrogen gas (106).

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同族专利:

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公开号 | 公开日

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KR100896580B1|2009-05-07|

引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
2002-11-15|Application filed by 주식회사 포스코

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2002-11-15|Priority to KR1020020071024A

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2004-05-22|Publication of KR20040043029A

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2009-05-07|Application granted

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2009-05-07|Publication of KR100896580B1

优先权:

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申请号 | 申请日 | 专利标题

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KR1020020071024A|KR100896580B1|2002-11-15|2002-11-15|Apparatus for recovering sensible heat from molten slag|