• 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:
    A multi-stage and energy-saving vacuum pump arrangement with a Roots vacuum pump in the first stage comprises a shut-off valve (13) arranged at an intake inlet opening, through which a non-condensed gas is received, which is sucked off by a condenser of a power plant, a first Roots vacuum pump (1) with is connected to the shut-off valve arranged at the suction inlet opening in order to receive and compress the gas passing through the shut-off valve arranged at the suction inlet opening, furthermore at least one second vacuum pump (2) being arranged, which is connected in series with the first Roots vacuum pump in order to reduce the amount of the first Roots vacuum pump (1) to compress pre-compressed gas further, with all second vacuum pumps being connected in series if more than one second vacuum pump (2) is present. A last-stage vacuum pump (3) is connected to the second vacuum pump (2) to further compress the gas expelled from the second vacuum pump (2), and a vapor separator (10) is also connected to the last-stage vacuum pump (3) to To separate vapor from a gas-vapor mixture generated in the last-stage vacuum pump (3), the gas then being ejected and the vapor being returned to the last-stage vacuum pump (3).
    公开号:CH714092B1
    申请号:CH00053/19
    申请日:2017-06-23
    公开日:2021-09-30
    发明作者:Z Shaw Raymond
    申请人:Elivac Company Ltd；
    IPC主号:
    专利说明:

    TECHNICAL AREA
    The present invention relates to a multi-stage and energy-saving vacuum pump arrangement with a Roots vacuum pump in the first stage.
    BACKGROUND OF THE INVENTION
    In a power plant, the coal consumption for power generation is significantly impaired by suction from a gas condenser. In a power generator with 300 MW to 330 MW, increasing the vacuum level by 1 Kpa reduces the consumption of coal at a rate of 2.6 g / kWh. At present, water jet air pumps, water / liquid ring pumps or vapor vacuum pumps are used as gas vacuum devices in power plants, the water in these vacuum pumps being used as a working medium. The capabilities of these vacuum pumps affect the temperature and pressure of the water. The capabilities of these vacuum pumps are low and difficult to control.
    For example, the operating temperature has a great influence on the quality of a water ring pump, with a power plant using natural water sources, these being used, for example, as cooling water. However, the temperature of the water source is affected by the climate and the seasons. If the temperature of the cooling water is higher, the vacuum of a vacuum pump is eliminated, whereby the efficiency of the gas delivery quickly drops to 80% to 90% of the original value, so that the operating performance is significantly impaired. Even if a predetermined pressure of the gas pump in the inlet of the system is reduced to zero, equipment can nevertheless be destroyed and safe operation impaired. Therefore, two vacuum pumps are often used to maintain the vacuum in the condenser and therefore the overall vacuum efficiency in the entire system, but this causes a waste of energy. The present invention is therefore intended to create a new multi-stage and energy-saving vacuum pump arrangement with a Roots vacuum pump in order to circumvent the problems described above.
    OBJECT OF THE INVENTION
    The present invention is intended to solve the problem described above. The present invention provides a multi-stage and energy-saving valmump pump arrangement, with a Roots vacuum pump in the first stage, which is used for sucking off a condenser of a power station. In the present invention, a Roots vacuum pump with the highest efficiency is used in a first stage, after which at least one vacuum pump is used in the second stage to further process the conveying gas, so that the expelled gas is compressed in several stages, whereby the amount of emitted gas is significantly reduced in order to achieve the goal of reducing electricity consumption.
    BRIEF DESCRIPTION OF THE DRAWINGS
    Figure 1 is an assembly view of the components of the present invention showing a three tier structure. FIG. 2 shows a side view of FIG. 1. FIG. 3 shows a rear view of FIG. 1.
    WAYS OF CARRYING OUT THE INVENTION
    [0006] Figs. 1 to 3 show the structure of the present invention. As shown in Figs. 1 to 3, in the present invention, a three-stage cooling process is used as an example for describing the structure of the present invention, but the present invention is not limited to the three-stage structure. The structure of the present invention consists of the following elements.
    There is an air supply shut-off valve 13 arranged at a suction inlet port, which serves to allow a non-condensed gas sucked from a condenser of a power plant (not shown) to enter.
    A first Roots vacuum pump 1 is connected to the air delivery shut-off valve 13 at the suction inlet port, with this Roots vacuum pump 1 the gas that is output from the air delivery shut-off valve 13 at the suction inlet port is received and compressed. The first Roots vacuum pump 1 comprises the following elements.
    A first vacuum hose is attached to the shut-off valve 13 arranged at the suction inlet port. The first vacuum hose receives the gas through the shut-off valve 13 arranged at the suction inlet opening, after which the gas is compressed therein.
    A raw gas pressure sensor 11 is positioned on an inlet side of the first vacuum hose to determine the gas pressure at the inlet of the first vacuum hose.
    With a first gas delivery device 18, the gas is delivered through the first vacuum hose. The first gas delivery device 18 consists of a first frequency-adjustable motor with a variable frequency drive (not shown). The first adjustable-frequency motor is arranged on an outside of the first vacuum hose. The frequency of the frequency adjustable motor is adjustable depending on the requirements of the system. The first gas delivery device 18 further includes a propulsion mechanism (such as blades). With the propulsion mechanism, the gas is propelled within the first vacuum hose. This is known in the prior art, so that a description of the details will be dispensed with.
    A spiral cooling tube 7 is positioned in the first vacuum hose. The gas is compressed, cooled with the spiral cooling tube 7, and then discharged.
    A temperature sensor 15 is positioned on an outlet side of the first vacuum hose to determine the temperature on the outlet side of the first vacuum hose.
    A gas outlet cooler 8 has an inlet side which is attached to the spiral cooling tube 7 in order to further cool the gas cooled with the spiral cooling tube 7.
    The non-condensed gas from a power plant is let into the first vacuum hose of the first Roots vacuum pump 1 through the shut-off valve 13 arranged at the suction inlet opening. The gas is then conveyed with the first gas conveying device 18 and compressed in the first Roots vacuum pump 18. During the compression, the gas to be compressed is cooled with the spiral cooling tube 7, and the discharged gas is then further cooled with the gas outlet cooler 8.
    At least one second Roots vacuum pump 2 is connected in series to an output side of the gas outlet cooler 8. The second Roots vacuum pump 2 receives the gas that has passed through the first Roots vacuum pump 18 through the gas outlet cooler 8 and then compresses the gas. The second Roots vacuum pump 2 consists of the following elements.
    A second vacuum hose is attached to the gas outlet cooler 8. The gas is compressed in the second vacuum hose.
    An outlet pressure sensor 12 is positioned at an outlet of the second vacuum hose to determine the gas pressure on the outlet side of the second vacuum hose.
    With a second gas delivery device 19, the gas is driven in the second vacuum hose. The second gas delivery device 19 consists of a second frequency-adjustable motor with a variable frequency drive (not shown). The second adjustable-frequency motor is arranged on an outside of the second vacuum hose. The frequency of the frequency-adjustable motor can be set depending on the requirements of the system. The second gas delivery device 19 further consists of a second propulsion mechanism (such as blades). With the second propulsion mechanism, the gas is propelled in the second vacuum hose. This is known from the prior art, so that a description of the details will be dispensed with.
    A second spiral cooling tube 5 is positioned in the second vacuum hose. The gas is compressed, cooled with the second spiral cooling tube 5, and then discharged.
    A second temperature sensor 16 is positioned at an outlet of the second vacuum hose to determine the temperature at an outlet end of the second vacuum hose.
    A bypass tube 17 for adjusting the pressure difference is attached to the second vacuum hose in order to adjust the pressure difference in the second vacuum hose. With the system, a gas delivery valve of the bypass pipe 17 is opened or closed to adjust the pressure difference in order to adjust the difference in the gas pressure in the vacuum hose.
    A second gas outlet cooler 4 has an inlet side connected to the spiral cooling tube 5 in order to further cool the gas discharged from the second spiral cooling tube 5.
    The gas that has passed through the first gas outlet cooler 8 and the first Roots vacuum pump 1 is conveyed on to the second vacuum hose of the second Roots vacuum pump 2. The gas is driven in the second Roots vacuum pump by means of the second gas delivery device 19, compressed in the second Roots vacuum pump 2 and then cooled with the second spiral cooling tube 5. The gas is then passed on to the second gas outlet cooler 4 in order to cool it down further.
    A liquid ring pump is arranged as the last-stage vacuum pump 3. This has an inlet side which is connected to the outlet side of the gas outlet cooler 4 in order to receive the gas emitted by the second Roots vacuum pump 2, the gas then being compressed with water in the liquid ring pump to generate a mixture of gas and steam. The liquid ring pump includes a second temperature sensor 14 positioned at the inlet of the liquid ring pump to determine the temperature at the inlet.
    A vapor separator 10 has an inlet connected to the liquid ring pump. The mixture of gas and vapor from the liquid ring pump is admitted into the vapor separator 10 to separate the gas from the vapor. The steam separator 10 includes a temperature sensor 20 on an outlet side of the steam separator 10 in order to detect the steam temperature on the outlet side of the steam separator 10.
    A liquid circulation heat exchanger 9 has an inlet side which is connected to the outlet side 102 of the vapor separator 10. An outlet side of the liquid circulation heat exchanger 9 is connected to the liquid ring pump.The water that has been separated from the mixture of the steam in the vapor separator 10 flows into the liquid circulation heat exchanger 9, in which it is cooled, after which the water flows back into the liquid ring pump.
    The present invention also includes a gas delivery valve 21 which is positioned at a circulating liquid suction end of the liquid ring pump to regulate the water supply from the vapor separator 10 to the liquid ring pump.
    The compressed mixture of gas and vapor in the liquid ring pump is admitted into the vapor separator 10 to separate the gas from the vapor. The separated gas is discharged through an upper end of the vapor separator 10.
    The gas cooled with the aid of the gas outlet cooler 4 flows into the liquid ring pump and is then compressed and with this a mixture of gas and steam is formed, the mixture then flowing into the vapor separator 10 in order to separate the gas and the vapor from each other again. The gas is discharged from the top of the vapor separator 10, while the vapor is cooled with the liquid circulation heat exchanger 9 and then flows back into the liquid ring pump. If the system has to be operated or stopped and this malfunctions, the gas delivery valve 21 of the liquid ring pump is opened or closed in order to prevent too much circulated liquid from flowing from the vapor separator 10 into the liquid ring pump, so that backflow or overflow of the water are avoided can.
    Figures 1 to 3 show a three-stage structure according to the present invention. In the present invention, the outlet and inlet pressures and temperatures are measured in order to perform a regenerative operation and thus improve the operating performance of the system. In this mode, the pressures that are measured with the pressure sensor 11 at the inlet of the first Roots vacuum pump 1 and the pressures on the inlet side of the last-stage liquid ring pump 3 that are measured with the pressure sensor 12 on the outlet side of the second Roots vacuum pump are analyzed. Furthermore, the temperatures measured with the temperature sensor 15 in the first Roots vacuum pump 1 and the temperatures measured with the temperature sensor 16 in the second Roots vacuum pump 2 are transmitted for analysis. The control signals are then transmitted to the first adjustable-frequency motor and the second adjustable-frequency motor to adjust the rotational speeds of the first adjustable-frequency motor and the second adjustable-frequency motor. The system therefore guarantees optimal and safe operation. Furthermore, the gas delivery valve of the bypass pipe 17 can be opened or closed with the system to adjust the pressure difference of the second Roots vacuum pump 2 in order to adjust the pressure difference in the vacuum hose.
    If a vacuum is to be maintained in the condenser of a power plant, a three-stage structure according to the present invention is suitable for this purpose. Similarly, for a power plant with a smaller capacity and with a vapor vacuum pump or a centrifugal vacuum pump that maintains a very lower vacuum or where the content of the conveying gas is low, a two-stage vacuum pump system according to the present invention can be used.
    The advantages of the present invention are that when using a Roots vacuum pump (no gas cooling root pump) in the first stage and other pumps, such as Roots vacuum pumps or other vacuum pumps, according to the present invention in the following stages of the power consumption compared with others Water ring pumps, steam pumps, centrifugal pumps according to the prior art is reduced. Therefore, by using the Roots vacuum pumps with other liquid ring pumps or vacuum pumps, the power consumption can be reduced by 20% - 30% compared to the conventional system. In addition, the space required to assemble the structure of the present invention is only a quarter of the area required for prior art water ring pumps, or only 70% the area for other prior art cooling ram vacuum pumps. The vacuum for a multi-stage and energy-saving vacuum pump arrangement is mainly dependent on the Roots vacuum pumps. These are only slightly affected by temperatures. Since the backflow is greater in the conventional vacuum system, the vacuum level of the system can be further promoted, so that the energy-saving vacuum pump arrangement of the present invention is more suitable for improving the evacuation of the gas condensate of a power plant.
    Despite the description of the present invention, it is apparent that the same can be modified in various ways. Such variations are not a departure from the spirit and scope of the present invention if such modifications are obvious to a person skilled in the art from the disclosure content, so that these modifications are also the subject of the invention and fall within the scope of the appended claims.
    权利要求:
    Claims (7)
    [1]
    1. Multi-stage and energy-saving vacuum pump arrangement with a Roots vacuum pump in the first stage, comprisinga shut-off valve (13) which is arranged at a suction inlet opening and is used for the inlet of a non-condensed gas which is sucked off by a condenser of a power plant;a first Roots vacuum pump (1) communicating with the shut-off valve (13) arranged at the suction inlet port for receiving and compressing a gas admitted through the shut-off valve (13) arranged at the suction inlet port;at least one second vacuum pump (2) which is connected in series with the first Roots vacuum pump in order to further compress the gas precompressed in the first Roots vacuum pump (1), all the second vacuum pumps being connected in series if there is more than one second vacuum pump (2) is.
    [2]
    2. The vacuum pump assembly of claim 1, further comprisinga last stage vacuum pump (3) connected to the second vacuum pump (2) for further compressing the gas discharged from the second vacuum pump (2); anda vapor separator (10) which is connected to the last-stage vacuum pump (3), the vapor separator (10) being configured to separate the vapor from a gas-vapor mixture generated in the last-stage vacuum pump (3), the gas thereafter ejected and the steam is returned to the last-stage vacuum pump (3).
    [3]
    3. Vacuum pump arrangement according to claim 1, wherein a Roots vacuum pump is used as the second vacuum pump.
    [4]
    4. Vacuum pump arrangement according to claim 1, wherein a gas valve of each vacuum pump is configured so that it is automatically controllable.
    [5]
    5. Vacuum pump arrangement according to claim 3, further comprising a second gas delivery device (19) of the second vacuum pump, in which the gas is delivered in a second vacuum hose, and wherein the second gas delivery device (19) comprises a second adjustable-frequency motor, the second adjustable-frequency motor on an outside of the second vacuum hose is arranged.
    [6]
    6. Vacuum pump arrangement according to claim 2, wherein a pressure at the inlet of the first Roots vacuum pump (1) can be measured with a pressure sensor (11), one at the inlet of the last-stage vacuum pump (3) which is connected to the at least one second vacuum pump (2) , the prevailing pressure can be measured with a pressure sensor (12) which is arranged on the outlet side of the second vacuum pump (2), the temperature in the first Roots vacuum pump (1) with a temperature sensor (15) and the temperature in the second vacuum pump (2 ) can be measured and analyzed with a temperature sensor (16), the signals of this analysis then being transferable to a first frequency-adjustable motor of the first Roots vacuum pump (1) and to a second frequency-adjustable motor of the second vacuum pump (2) in order to determine the rotational speeds of the first frequency-adjustable Motor and the second frequency-adjustable motor, so that the operation of the system optimally and safely r is.
    [7]
    7. Vacuum pump arrangement according to claim 3, wherein the second vacuum pump (2) further comprises a second vacuum hose, wherein a gas delivery valve of a bypass pipe (17) for setting the pressure difference of the second Roots vacuum pump (2) can be opened or closed in order to set a pressure difference in the second vacuum hose.
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    引用文献:
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    CN204783661U|2015-07-13|2015-11-18|宁波浙铁大风化工有限公司|Tertiary roots's pendular ring vacuum unit|
    CN105202937B|2015-10-10|2017-06-20|中联西北工程设计研究院有限公司|A kind of condenser Vacuumization energy-saving device without cavitation low noise|
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    CN206017140U|2016-07-12|2017-03-15|上海伊莱茨真空技术有限公司|A kind of three-level Roots water ring intelligent frequency-conversion controls vacuum system|CN106014997B|2016-07-12|2018-07-13|上海伊莱茨真空技术有限公司|A kind of three-level Roots-water ring intelligent frequency-conversion control vacuum system and its control method|
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    法律状态:
    优先权:
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    CN201610542660.1A|CN106014997B|2016-07-12|2016-07-12|A kind of three-level Roots-water ring intelligent frequency-conversion control vacuum system and its control method|
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