CN214887723U - Cooling system capable of reducing sealing water temperature of water-ring vacuum pump - Google Patents
Cooling system capable of reducing sealing water temperature of water-ring vacuum pump Download PDFInfo
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- CN214887723U CN214887723U CN202120940853.9U CN202120940853U CN214887723U CN 214887723 U CN214887723 U CN 214887723U CN 202120940853 U CN202120940853 U CN 202120940853U CN 214887723 U CN214887723 U CN 214887723U
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Abstract
The embodiment of the utility model provides a can reduce cooling system of water ring vacuum pump sealing water temperature, cooling system includes: a circulating water pump for driving the open cooling water circulation; the water inlet end of the open cooling water pump is communicated with the water outlet end of the circulating water pump; the first control valve is connected with the open cooling water pump in parallel; a water supply main pipe with one end communicated with the water outlet end of the open cooling water pump; the pipeline pump is arranged on the water supply main pipe; a water supply bypass provided in parallel with the pipe pump; the second control valve is arranged on the water supply bypass; a plurality of water inlet ends and the vacuum pump sealing water cooler communicated with the other end of the water supply main pipe. The utility model discloses, utilize the tubing pump to improve vacuum pump cooling water flow, reduce the vacuum pump sealing water temperature, improve the unit vacuum, reduce low pressure jar exhaust temperature, improve the unit heat supply, and tubing pump power is lower, can practice thrift the station service greatly, improves the economic benefits of power plant. Meanwhile, the cooling system is simple in structure, convenient to maintain and high in practicability.
Description
Technical Field
The utility model relates to a gas-steam combined cycle unit technical field particularly, relates to a cooling system that can reduce the sealed water temperature of water ring vacuum pump.
Background
At present, most of gas-steam combined cycle machine groups are composed of two gas turbines and a steam turbine, and a steam turbine vacuum system is provided with three water ring vacuum pumps for pumping non-condensed gas in a condenser so as to maintain the vacuum of the condenser and improve the heat exchange condition of the condenser. Each vacuum pump is provided with a steam-water separator, and the steam-water separator separates non-condensable gas pumped by the vacuum pump from water and then discharges the non-condensable gas into the atmosphere. The sealing water is provided with a sealing water cooler, and the required cooling water has two sources, wherein one source is from an open type circulating cooling water supply main pipe of the main plant, and the other source is returned to the open type circulating cooling water return main pipe of the main plant after heat exchange; the other path of the heat exchange water comes from a raw water system of the whole plant and returns circulating water to the main water pipe after heat exchange.
When the water ring vacuum pump operates, in order to maintain the pumping capacity of the vacuum pump, the temperature T of sealing water of the vacuum pump must be kept at a certain supercooling degree, and if the water temperature rises, the sealing water of the vacuum pump is vaporized, the pumping capacity of the vacuum pump is reduced, and the vacuum degree of a condenser is reduced. The cooling water of the vacuum pump sealing water cooler is designed to be open cooling water, and in winter operation, because the heat supply of a unit is large, the amount of steam entering a low-pressure cylinder is small, a circulating pump maintains low-load operation, and an open cooling water pump is in a standby state, so that the water supply pressure of an open cooling water pipeline is low. When the cooling water source of the vacuum pump sealed water cooler is boiled cold water, the flow of the cooling water is insufficient, the temperature of the vacuum pump sealed water rises, the condenser is in vacuum reduction, the unit efficiency is reduced, and meanwhile, the heat supply capacity of the unit is reduced due to the fact that the exhaust temperature of the low-pressure cylinder rises.
In the prior art, two methods are adopted for reducing the temperature of sealing water of a vacuum pump in the operation of a unit. The first method comprises the following steps: when circulating water pressure is lower, the vacuum pump cooling water yield can not reach the cooling water yield of predetermineeing, at this moment, start the cold water pump, the sealed water supply pipe pressure of vacuum pump rises to the cooling water discharge of the sealed water chiller of vacuum pump increases, the sealed water temperature of vacuum pump descends, the vacuum pump evacuation ability improves, however, the cold water pump that the adoption of this kind of method used is 6kV motor, and its rated power is 220kW, starts the cold water pump and can make the station service rate rise by a wide margin. The second method is as follows: switch to raw water with the sealed water cooler cooling water source of vacuum pump by open circulating water, because raw water temperature receives ambient temperature to influence lessly, and the temperature is lower moreover, and its temperature value is generally about 10 ℃ to cut to make the sealed temperature of vacuum pump decline after raw water, however, because raw water is the urgent reserve water source of power plant, non-emergency can't use, consequently, switch to raw water and can reach the purpose that reduces the sealed temperature of vacuum pump, but the feasibility is not high.
Disclosure of Invention
The present specification provides a cooling system for reducing the temperature of seal water in a water-ring vacuum pump, which overcomes at least one technical problem in the prior art.
According to an embodiment of the present specification, there is provided a cooling system that can reduce a temperature of seal water of a water-ring vacuum pump, the cooling system including: a circulating water pump for driving the open cooling water circulation; the water inlet end of the open cooling water pump is communicated with the water outlet end of the circulating water pump; a first control valve connected in parallel with the open cooling water pump; a water supply main pipe, one end of which is communicated with the water outlet end of the open cooling water pump; the pipeline pump is arranged on the water supply main pipe; a water supply bypass provided in parallel with the pipe pump; the second control valve is arranged on the water supply bypass; and the plurality of water inlet ends are communicated with the other end of the water supply main pipe.
Preferably, the cooling system further comprises a pressure gauge; the pressure gauge is arranged on the water supply main pipe and used for monitoring the pressure in the water supply main pipe.
Preferably, the first control valve is an electrically operated valve.
Preferably, a check valve is further disposed on the water supply bypass.
Preferably, the second control valve is an electrically operated valve.
Preferably, the cooling system further comprises a water return pipe; the water return pipe is communicated with the water outlet end of the vacuum pump sealing water cooler.
Further preferably, the cooling system further comprises a condenser; and the water inlet end of the condenser is communicated with the water outlet end of the circulating water pump.
Still further preferably, the water outlet end of the condenser is communicated with the water return pipe.
Further preferably, the cooling system further comprises a closed water heat exchanger; and the water inlet end of the closed water heat exchanger is communicated with the water outlet end of the open cooling water pump.
Still further preferably, the water outlet end of the closed water heat exchanger is communicated with the water return pipe.
By applying the embodiment of the specification, the pipeline pump is additionally arranged on the water supply main pipe of the vacuum pump sealing water cooler, the pipeline pressure of the vacuum pump sealing water is improved by utilizing the pipeline pump, the water supply flow of the cooling water of the vacuum pump sealing water cooler is further improved, and the temperature of the vacuum pump sealing water is reduced. And after the open cooling water pump is started, the pipeline pump is stopped, a second control valve on the water supply bypass corresponding to the pipeline pump is opened, and the pressure of the vacuum pump sealing water pipeline is increased by the open cooling water pump. Because the power of the pipeline pump is obviously lower than that of the open cooling water pump, the pipeline pump is used during the initial stage or the final stage of a heat supply season during pumping and condensing working conditions and low-load pure condensing working conditions, the service power can be greatly saved, and the economic benefit of a power plant is improved. Meanwhile, the cooling system is simple in structure, convenient to maintain and high in practicability.
The innovation points of the embodiment of the specification comprise:
1. when the unit is in pumping condensation operation or pure condensation low-load operation, the pipeline pump can be started to improve the pipeline pressure of the vacuum pump sealing water, so that the cooling water flow of the vacuum pump sealing water cooler is improved, the temperature of the vacuum pump sealing water is reduced, the suction capacity of the vacuum pump is improved, the normal output of the vacuum pump is ensured, the unit condenser is kept in vacuum, the exhaust temperature of the low-pressure cylinder can be reduced, and the heat supply capacity of the unit is improved.
2. The pipeline pump power in the cooling system is lower, and compared with a high-power open cooling water pump, the system can greatly save the service power and improve the economic benefit of a power plant.
3. The cooling system is small in modification, low in modification cost, simple in structure, convenient to design and maintain, high in practicability and beneficial to improvement of economic performance of the unit.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a cooling system capable of reducing the temperature of seal water of a water-ring vacuum pump according to an embodiment of the present disclosure;
FIG. 2 is an enlarged schematic structural view of a water supply main pipe portion of a cooling system capable of reducing the sealing water temperature of a water ring vacuum pump provided in an embodiment of the present disclosure;
description of reference numerals: 1 is a circulating water pump, 2 is an open cooling water pump, 3 is a first control valve, 4 is a water supply main pipe, 5 is a pipeline pump, 6 is a water supply bypass, 7 is a second control valve, 8 is a vacuum pump sealing water cooler, 9 is a pressure gauge, 10 is a check valve, 11 is a water return pipe, 12 is a condenser and 13 is a closed water heat exchanger.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.
It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present specification and the drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The embodiment of the specification discloses a cooling system capable of reducing the temperature of sealing water of a water-ring vacuum pump. The following are detailed below.
Fig. 1 and 2 illustrate a cooling system capable of reducing the temperature of sealing water of a water-ring vacuum pump according to an embodiment of the present disclosure. As shown in fig. 1 and fig. 2, the cooling system includes a circulating water pump 1, an open cooling water pump 2, a first control valve 3, a water supply main pipe 4, a pipeline pump 5, a water supply bypass 6, a second control valve 7, a vacuum pump sealed water cooler 8, a pressure gauge 9, a check valve 10, a water return pipe 11, a condenser 12 and a closed water heat exchanger 13.
Wherein, circulating water pump 1 is used for driving open cooling water circulation, supplies main building open circulating cooling water for this cooling system. In a specific embodiment, the circulating water pumps 1 may include a plurality of summer circulating water pumps and a plurality of winter circulating water pumps, and the corresponding circulating water pumps 1 are started corresponding to different operation periods so as to correspond to different operation conditions, so that the unit operates more economically and efficiently.
In the embodiment of the present specification, the cooling water source provided by the circulating water pump 1 is divided into two paths, one path is used for cooling the condenser 12, and the other path is used for cooling the vacuum pump seal water cooler 8.
Specifically, the water inlet end of the condenser 12 is communicated with the water outlet end of the circulating water pump 1, and the cooling water supplied by the circulating water pump 1 is used for heat exchange.
The end of intaking of open cooling water pump 2 is linked together with circulating water pump 1 goes out the water end, and the play water end intercommunication of open cooling water pump 2 supplies the one end of female pipe 4 of water, and the other end of the female pipe 4 of supplying water is linked together with the end of intaking of a plurality of vacuum pump seal water coolers 8, and open cooling water pump 2 goes up parallelly connected and is provided with first control flap 3, preferred, first control flap 3 is electric valve. When the open cooling water pump 2 is operated, cooling water flows into the water supply main pipe 4 through the open cooling water pump 2; when the open cooling water pump 2 is in standby, the cooling water flows into the water supply main pipe 4 through the first control valve 3. This cooling system controls the cooling water that circulating water pump 1 carried through open cooling water pump 2 and first control flap 3 to carry this cooling water to a plurality of vacuum pump seal water coolers 8 in through supplying water main pipe 4, thereby guarantee the suction capacity of vacuum pump seal water cooler 8, keep condenser 12 vacuum.
The unit is when the winter operation, because the unit heat supply is great, the steam volume that gets into the low pressure jar is very little, circulating water pump 1 maintains lower load operation, at this moment, open cooling water pump 2 is in standby state, first control flap 3 is opened, the cooling water is carried through first control flap 3, lead to supplying water female pipe 4 water supply pressure lower, and then make the cooling water flow not enough, the vacuum pump sealed water temperature risees, the condenser vacuum descends, unit efficiency reduces, simultaneously, because low pressure jar exhaust steam temperature rises, lead to the unit heat supply ability to descend.
In order to solve the above problems, a pipeline pump 5 is additionally arranged on the water supply main pipe 4, a water supply bypass 6 connected in parallel with the pipeline pump 5 is designed, and a second control valve 7 is arranged on the water supply bypass 6, wherein the second control valve 7 is preferably an electric valve. When the pipeline pump 5 is started and the second control valve 7 is closed, cooling water is conveyed through the pipeline pump 5; when the pipe pump 5 is turned off and the second control valve 7 is opened, the cooling water is delivered through the supply water bypass 6 by the pipe pump 5. When the unit heat supply operating mode in winter or spring and autumn electric load is lower, circulating water pump 1 frequency is lower, and circulating water pressure is lower, and it is low to open cold water pressure, starts tubing pump 5, can improve vacuum pump seal water pipeline pressure, promotes the pressure in the water supply main pipe 4 promptly to improve the water supply flow of the 8 cooling waters of vacuum pump seal water cooler, reduce the vacuum pump seal water temperature. After the open cooling water pump 2 is started, the pressure of the vacuum pump sealing water pipeline rises, the pipeline pump 5 can be stopped, the second control valve 7 is opened simultaneously, and cooling water is conveyed through the water supply bypass 6, so that stable and sufficient cooling water flow can be kept all the time, the temperature of the vacuum pump sealing water is kept at a certain supercooling degree, the output and suction capacity of the vacuum pump are guaranteed, the vacuum of the condenser is further kept, and the unit efficiency and the heat supply capacity are improved.
In the specific implementation process, a 30kW power pipeline pump 5 is adopted, and the flow rate is 80t/h, so that the requirement of cooling water when two vacuum pumps run simultaneously can be met. Compared with a boiling cold water pump with 220kW power, the system is calculated by using the pumping and condensing working condition at the initial stage or the final stage of a heating season and the low-load pure condensing working condition for 3000h, can save the service power (220-30). times.3000-57 ten thousand kilowatts, and has 34 ten thousand yuan of reduced economic benefit, so that the cooling system can greatly improve the economic benefit of a power plant.
Further, in order to prevent the cooling water from flowing back, a check valve 10 is further disposed on the water supply bypass 6, so that the cooling system is safer and more reliable. In addition, a pressure gauge 9 is arranged on the water supply main pipe 4, and the pressure gauge 9 is used for monitoring the pressure in the water supply main pipe 4. When the pressure in the water supply main pipe 4 is lower than a preset value, the pipeline pump 5 can be started to ensure the preset flow of the cooling water, and the automation is strong.
In addition, cooling system still includes wet return 11, and wet return 11 is linked together with the play water end of the sealed water cooler 8 of vacuum pump, the play water end of condenser 12 respectively, and the cooling water after carrying out the heat transfer in the sealed water cooler 8 of vacuum pump, condenser 12 carries to the cooling tower through wet return 11 to carry out cyclic utilization, improved the utilization ratio of water resource greatly, practice thrift the cost.
Meanwhile, the cooling water conveyed by the open cooling water pump 2 and the first control valve 3 can also be used for cooling operation of the closed water heat exchanger 13, the water inlet end of the closed water heat exchanger 13 is communicated with the water outlet end of the open cooling water pump 2, and the water outlet end of the closed water heat exchanger 13 is communicated with the water return pipe 11, so that the utilization rate of the cooling water is further improved.
To sum up, this specification discloses a cooling system that can reduce water ring vacuum pump sealing water temperature adds a tubing pump on the water supply main pipe of vacuum pump sealing water cooler, utilizes this tubing pump to improve vacuum pump sealing water pipeline pressure, and then improves the water supply flow of vacuum pump sealing water cooler cooling water, reduces vacuum pump sealing water temperature. And after the open cooling water pump is started, the pipeline pump is stopped, a second control valve on the water supply bypass corresponding to the pipeline pump is opened, and the pressure of the vacuum pump sealing water pipeline is increased by the open cooling water pump. Because the power of the pipeline pump is obviously lower than that of the open cooling water pump, the pipeline pump is used during the initial stage or the final stage of a heat supply season during pumping and condensing working conditions and low-load pure condensing working conditions, the service power can be greatly saved, and the economic benefit of a power plant is improved. Meanwhile, the cooling system is simple in structure, convenient to maintain and high in practicability.
Those of ordinary skill in the art will understand that: the figures are schematic representations of one embodiment, and the blocks or processes in the figures are not necessarily required to practice the present invention.
Those of ordinary skill in the art will understand that: modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, or may be located in one or more devices different from the embodiments with corresponding changes. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.
Claims (10)
1. A cooling system for reducing the temperature of seal water of a water-ring vacuum pump, the cooling system comprising: a circulating water pump for driving the open cooling water circulation; the water inlet end of the open cooling water pump is communicated with the water outlet end of the circulating water pump; a first control valve connected in parallel with the open cooling water pump; a water supply main pipe, one end of which is communicated with the water outlet end of the open cooling water pump; the pipeline pump is arranged on the water supply main pipe; a water supply bypass provided in parallel with the pipe pump; the second control valve is arranged on the water supply bypass; and the plurality of water inlet ends are communicated with the other end of the water supply main pipe.
2. The cooling system capable of reducing the temperature of the sealing water of the water-ring vacuum pump according to claim 1, further comprising a pressure gauge; the pressure gauge is arranged on the water supply main pipe and used for monitoring the pressure in the water supply main pipe.
3. The cooling system capable of reducing the temperature of the sealing water of the water-ring vacuum pump as claimed in claim 1, wherein the first control valve is an electrically operated valve.
4. The cooling system capable of reducing the temperature of the sealing water of the water-ring vacuum pump as claimed in claim 1, wherein a check valve is further disposed on the water supply bypass.
5. The cooling system for reducing the sealing water temperature of a water-ring vacuum pump as claimed in claim 1, wherein the second control valve is an electrically operated valve.
6. The cooling system capable of reducing the temperature of the seal water of the water-ring vacuum pump according to claim 1, further comprising a water return pipe; the water return pipe is communicated with the water outlet end of the vacuum pump sealing water cooler.
7. The cooling system capable of reducing the temperature of the sealing water of the water-ring vacuum pump according to claim 6, wherein the cooling system further comprises a condenser; and the water inlet end of the condenser is communicated with the water outlet end of the circulating water pump.
8. The cooling system capable of reducing the temperature of the sealing water of the water-ring vacuum pump as claimed in claim 7, wherein the water outlet end of the condenser is communicated with the water return pipe.
9. The cooling system capable of reducing the temperature of the seal water of the water-ring vacuum pump according to claim 6, further comprising a closed water heat exchanger; and the water inlet end of the closed water heat exchanger is communicated with the water outlet end of the open cooling water pump.
10. The cooling system capable of reducing the temperature of the seal water of the water-ring vacuum pump as claimed in claim 9, wherein the water outlet end of the closed water heat exchanger is communicated with the water return pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120940853.9U CN214887723U (en) | 2021-05-06 | 2021-05-06 | Cooling system capable of reducing sealing water temperature of water-ring vacuum pump |
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| CN202120940853.9U CN214887723U (en) | 2021-05-06 | 2021-05-06 | Cooling system capable of reducing sealing water temperature of water-ring vacuum pump |
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| CN214887723U true CN214887723U (en) | 2021-11-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115111850A (en) * | 2022-06-09 | 2022-09-27 | 华能国际电力股份有限公司丹东电厂 | Closed cooling water circulation system of power plant |
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2021
- 2021-05-06 CN CN202120940853.9U patent/CN214887723U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115111850A (en) * | 2022-06-09 | 2022-09-27 | 华能国际电力股份有限公司丹东电厂 | Closed cooling water circulation system of power plant |
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