CN213930438U - Device for improving performance of sealed water supply system of water supply pump set of thermal power plant - Google Patents
Device for improving performance of sealed water supply system of water supply pump set of thermal power plant Download PDFInfo
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- CN213930438U CN213930438U CN202022751965.8U CN202022751965U CN213930438U CN 213930438 U CN213930438 U CN 213930438U CN 202022751965 U CN202022751965 U CN 202022751965U CN 213930438 U CN213930438 U CN 213930438U
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Abstract
The utility model relates to a thermodynamic power plant feeds water pump package sealing water system technical field, more specifically relates to a device that improves thermodynamic power plant feeds water pump package sealing water supply system performance, the condensate water pressure female pipe, the condensate water fine treatment system, bearing seal heater, booster pump, the condensate water mother pipe and adjusting valve, orifice plate and the connecting tube of condensate water pump package export have been included, are provided with 3 regulating lines between condensate water pressure female pipe and orifice plate, the water supply end of regulating line is connected with the entrance point of orifice plate, is connected with the feed water pump package through orifice plate and temperature regulating valve and supplies sealing water to the feed water pump package. The sealing water supply system is characterized in that when the load of a thermal power plant unit changes and the amount of miscellaneous water changes, the pressure of the condensed water at the inlet end of the throttling orifice plate is higher and stable, and the sealing water continuously and stably supplied to the water supply pump set is ensured.
Description
Technical Field
The utility model relates to a thermal power plant feed pump package sealing water system technical field, more specifically relates to a device of improving thermal power plant feed pump package sealing water supply system performance.
Background
The insufficient pressure of the front end of sealing water of a water feed pump unit of a thermal power plant becomes one of important hidden dangers of stable and efficient operation of the water feed pump unit, and domestic power plants pay attention to the hidden dangers.
In a large thermal power generating set, a high-pressure water feed pump set is called as the heart of a power plant and is an important auxiliary machine of a modern thermal power plant.
A sealing water system is an important system in a high pressure feed water pump set. The wear associated with the high speed rotor of a high pressure feed water pump makes the seals of the high pressure feed water pump subject to frequent leakage events. The sealing failure can bring direct economic loss to enterprises and also can threaten personal safety of workers. The unstable high-pressure water pump device always has hidden troubles in the production of enterprises, and is not favorable for the normal production of the enterprises. The good sealing water system can ensure the normal work of the high-pressure water pump device and can improve the working efficiency.
The hydraulic sealing is that a certain amount of high-pressure water is introduced into the sealing cavity to play the roles of water sealing, cooling and flushing. The sealing structure is a non-contact hydrodynamic seal, and is a novel rotating shaft sealing structure developed in recent years. The hydraulic sealing structure is simple, easy to maintain, free of abrasion in working, low in failure rate and long in service life.
The seal water is usually from the outlet of a condensate pump or an auxiliary booster pump of the power plant. The supply pressure of the condensing pump is different from the internal pressure of a boiler feed water pump, so that the adjustment and control of the sealing water pressure and flow are key factors for the good operation of a hydraulic sealing system.
The feed water pressure of the feed water pump set is obviously improved along with the increase of the capacity of the thermal power generating unit. The water feed pump group is used as important equipment in the production process of a thermal power plant, the water feed pressure of the supercritical thermal power generating unit reaches more than 23MPa, and the water feed pressure of the ultra-supercritical thermal power generating unit reaches more than 30MPa, so that the hydraulic sealing difficulty is increased, leakage of a sealing system occurs sometimes, and adverse effects are caused on the normal operation of the thermal power generating unit, such as the reduction of the operation efficiency of the water feed pump, the reduction of the water feed pressure, even the damage of the water feed pump group and the like. Therefore, the hydraulic sealing system of the feed pump set is effectively controlled, the production efficiency can be improved, and the safety of the production process is ensured.
The seal water for the thermal power plant feed pump package is typically from a condensate pump. In the process of power production, the unit electrical load must be matched with the electrical load. When the electrical load of the unit is adjusted, when the flow rate and the pressure of the condensed water are changed remarkably, the supply pressure and the flow rate of the sealing water are easy to be unstable, and the continuous and stable supply of enough sealing water flow is difficult to guarantee.
The thermal power plant participates in peak shaving operation, in order to guarantee the safety margin of the sealing water pressure of the water supply pump, the rotating speed reduction of a frequency converter of a motor of the condensate pump is limited, and the throttling loss of the condensate system under the low load of a unit is large, so that the power consumption rate of the motor of the condensate pump is increased.
The seal water of the feed pump group and various water such as the desuperheating water of the condenser commonly share a condensed water taking mother pipe. When the water consumption of each item of water such as condenser desuperheating water changes remarkably, the pressure of the condensate water taking main pipe can also fluctuate greatly, so that the pressure and the flow of the sealing water of the water supply pump set fluctuate greatly, the operation of the water supply pump set is adversely affected, and even the normal operation is difficult.
Disclosure of Invention
In view of the above, the present invention provides a device for improving the performance of a sealed water supply system of a water pump set of a thermal power plant, which can maintain the pressure of the sealed water supply and continuously and stably supply enough flow of the sealed water when the load of the set and the condensed water system change, so that the whole water pump set can operate with better stability and efficiency.
In order to achieve the above purpose, the utility model adopts the technical scheme that: the utility model provides a device for improving sealed water supply system performance of thermal power plant feed pump package, has included the condensate water pressure mother pipe of condensate water pump package export, condensate water fine treatment system, bearing seal heater, booster pump, condensate water mother pipe and adjusting valve, orifice plate and connecting tube of getting into, is provided with 3 regulating lines between condensate water pressure mother pipe and orifice plate, the water supply end of regulating line is connected with the entrance point of orifice plate, is connected with feed pump package through orifice plate and temperature regulating valve and supplies the sealed water to feed pump package. The condensed water from the condensed water pressure main pipe is respectively connected with the inlet end of the throttle orifice plate through 3 regulating pipelines, and the sealed water is supplied to the water feed pump set through the throttle orifice plate and the temperature regulating valve.
Preferably, the first adjusting pipeline is formed by sequentially connecting a condensate water taking main pipe and a first gate valve between the condensate fine treatment system and the shaft seal heater, and a water supply end of the first gate valve is connected with an inlet end of the throttle orifice plate.
Preferably, the second regulating pipeline is formed by sequentially connecting a condensate water taking main pipe, a second gate valve, a booster pump and a third gate valve between the condensate water fine treatment system and the inlet shaft seal heater, and the water supply end of the third gate valve is connected with the inlet end of the throttle orifice plate.
Preferably, the outlet pipeline of the booster pump is provided with a flow regulating branch pipeline, and the flow regulating branch pipeline is connected with the inlet pipeline of the booster pump through a flow regulating valve.
Preferably, the third adjusting pipeline is provided with a stop valve and a check valve between the condensed water pressure main pipe and the condensed water fine treatment system, and the water supply end of the check valve is connected with the inlet end of the throttling orifice plate.
Preferably, a boiler air supply temperature reduction water taking point, a condenser temperature reduction water taking point and other water taking points are arranged on the condensed water taking main pipe.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a set up 3 regulation pipelines that can make quick adjustment according to different situation of change, thermal power plant unit load change and when miscellaneous condensate water yield changes have effectively been solved, the condensate water pressure of the sealed water system of feed pump group reduces and the problem that the flow is not enough, the condensate water pressure of sealed water system has been improved, and sealed water supply flow has been guaranteed, when thermal power plant unit load change, when condensate water system parameter variation and miscellaneous water yield change, the condensate water pressure that keeps the throttle orifice entrance point is higher, and stable, guarantee to continuously and stably supply the seal water to feed pump group. The utility model relates to a rational in infrastructure, convenient regulation and control, strong adaptability, easy maintenance, the during operation does not have wearing and tearing, and the fault rate is low, and long service life effectively ensures the permanent normal operating of feed pump group.
Drawings
FIG. 1 is a schematic diagram of an apparatus for improving the performance of a sealed water supply system of a feed pump set of a thermal power plant
The graphic symbols are illustrated as follows: 1-condensed water pressure main pipe, 2-condensed water fine treatment system, 3-shaft seal heater, 4-stop valve, 5-check valve, 6-third valve gate, 7-booster pump, 8-second valve gate, 9-first gate valve, 10-orifice plate, 11-temperature regulating valve, 12-water feed pump group, 13-low pressure heater group, 14-boiler air supply and water reducing temperature water taking point, 15-condenser water reducing temperature water taking point, 16-other water taking point, 17-condensed water taking main pipe and 18-flow regulating valve.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are the terms "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of the description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and those skilled in the art can understand the specific meanings of the terms according to specific situations.
To further clarify the objects, features, and functions of the present invention, a review board may further describe the following detailed description of the invention in conjunction with the accompanying drawings:
please refer to fig. 1, which is a schematic diagram of the system structure of the present invention, the present invention provides a device for improving the performance of the sealing water supply system of the feed pump set of the thermal power plant, which comprises a condensation water pressure main pipe 1 at the outlet of the condensation water pump set, a condensation water fine treatment system 2, a shaft seal heater 3, a booster pump 7, a condensation water intake main pipe 17, an adjusting valve, a throttle orifice plate 10 and a connecting pipeline, wherein 3 adjusting pipelines are arranged between the condensation water pressure main pipe and the throttle orifice plate, the water supply end of the adjusting pipeline is connected with the inlet end of the throttle orifice plate 10, and the sealing water is supplied to the feed pump set through the throttle orifice plate 10 and the temperature adjusting valve 11 connected with the feed pump set.
Preferably, the first adjusting pipeline is formed by sequentially connecting a condensate water taking main pipe 17 and a first gate valve 9 between the condensate water fine treatment system 2 and the shaft seal heater 3, and a water supply end of the first gate valve 9 is connected with an inlet end of the orifice plate 10.
Preferably, the second regulating pipeline is formed by sequentially connecting a condensate water taking main pipe 17, a second gate valve 8, a booster pump 7 and a third gate valve 6 between the condensate water fine treatment system 2 and the inlet shaft seal heater 3, and the water supply end of the third gate valve 6 is connected with the inlet end of the orifice plate 10.
Preferably, the outlet pipeline of the booster pump 7 is provided with a flow regulating branch pipeline, and the flow regulating branch pipeline is connected with the inlet pipeline of the booster pump 7 through a flow regulating valve 18.
Preferably, the third adjusting pipeline is provided with a stop valve 4 and a check valve 5 between the condensed water pressure main pipe 1 and the condensed water fine treatment system 2, and the water supply end of the check valve 5 is connected with the inlet end of the orifice plate 10.
Preferably, a boiler air supply temperature-reducing water taking point 14, a condenser temperature-reducing water taking point 15 and other water taking points 16 are arranged on the condensed water taking mother 17 pipe.
The following non-limiting examples serve to illustrate the present invention:
the utility model discloses an improve device of thermal power plant feed pump package sealing water supply system performance is shown in FIG. 1, and the condensate water that comes from the female pipe 1 of condensate water pressure gets into condensate water fine treatment system 2, through bearing seal heater 3 afterwards, as the main condensate water that goes low pressure heater group 13, is power plant's steam power cycle's working medium. A condensate water taking main pipe 17 is led out between the condensate water fine treatment system 2 and the shaft seal heater 3. And then a plurality of branches are led out from the condensed water taking main pipe 17, wherein the branches comprise but are not limited to water using equipment for supplying sealing water to the water feeding pump set 12, a boiler air supply and temperature reduction water taking point 14, a condenser temperature reduction water taking point 15, other water using and taking points 16 and the like.
When the unit load and the pressure of the condensate water taking main pipe 17 are high, the condensate water from the condensate water pressure main pipe 1 passes through the condensate water fine treatment system 2 and then enters the shaft seal heater 3, the condensate water taking main pipe 17 and the first gate valve 9 pass through the first adjusting pipeline, the water supply end of the first gate valve 9 is connected with the inlet end of the throttle orifice plate 10, the output supply pressure of the seal water is adjusted through the throttle orifice plate 10 and the temperature adjusting valve 11, the high and stable condensate water pressure at the inlet end of the throttle orifice plate is kept, and the seal water is continuously and stably supplied to the water supply pump unit 12.
When the load of the unit changes and the pressure of the condensate water taking main pipe 17 is lower, the first gate valve 9 is closed, the condensate water from the condensate water pressure main pipe 1 is led in from the condensate water taking main pipe 17 through the second adjusting pipeline before passing through the condensate water fine treatment system 2 and entering the shaft seal heater 3, the seal water is adjusted and conveyed through the second gate valve 8, the booster pump 7 and the third gate valve 6, and the water supply end of the third gate valve 6 is connected with the inlet end of the throttle orifice plate 10. Part of the sealing water pressurized by the booster pump 7 is supplied to the feed pump group 12 through the orifice plate 10 and the temperature control valve 11 in a continuously stable output manner.
Preferably, the outlet pipeline of the booster pump 7 is provided with a flow regulating branch pipeline, and the flow regulating branch pipeline is connected with the inlet pipeline of the booster pump 7 through a flow regulating valve 18. The other part of the sealing water is merged with the condensed water from the condensed water taking main pipe 17 through the flow regulating valve 18 and enters the inlet end of the booster pump 7.
The opening of the flow regulating valve 18 is adjusted to control the inlet end pressure of the orifice plate 10 and the flow of the seal water 12. When the pre-valve pressure of the flow control valve 18 exceeds or falls below the set point of the flow control valve 18, the flow control valve 18 automatically adjusts the amount of water flow therethrough.
When the booster pump 7 and the flow regulating valve 18 need to be overhauled, the two gate valves 8 and the third gate valve 6 are closed, so that the booster pump 7 and the flow regulating valve 18 are cut off and isolated, and the overhaul and maintenance operation is convenient. When other regulating circuits are used, the second regulating circuit is closed.
When the load of the unit changes, the pressure of the condensate water taking main pipe 17 is lower, and the booster pump 7 is stopped or overhauled, the condensate water from the condensate water pressure main pipe 1 reaches the inlet end of the throttling orifice plate 10 after being conveyed by the stop valve 4 and the check valve 5, the output supply pressure of the seal water is adjusted by the throttling orifice plate 10 and the temperature adjusting valve 11, the condensate water pressure at the inlet end of the throttling orifice plate is kept higher and stable, the seal water is continuously and stably supplied to the water feed pump group 12, and the check valve 5 is arranged to prevent the problem that the loss of the output seal water pressure is reduced due to the backflow of the seal water output from the second adjusting pipeline from the third adjusting pipeline.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (7)
1. The device for improving the performance of the sealing water supply system of the water supply pump set of the thermal power plant comprises a condensation water pressure main pipe at the outlet of the condensation water pump set, a condensation water fine treatment system, a shaft seal heater, a booster pump, a condensation water taking main pipe, an adjusting valve, a throttling orifice plate and a connecting pipeline.
2. The apparatus of claim 1, wherein the regulating valve comprises a first gate valve, a second gate valve, a third gate valve, a stop valve, a check valve, a temperature regulating valve, and a flow regulating valve.
3. The apparatus of claim 1, wherein the first regulating pipeline is a condensate water collecting main pipe and a first gate valve sequentially connected between the condensate fine treatment system and the shaft seal heater, and a water supply end of the first gate valve is connected to an inlet end of the orifice plate.
4. The apparatus of claim 1, wherein the second regulating pipeline is a condensate water intake main pipe, a second gate valve, a booster pump and a third gate valve connected in sequence between the condensate polishing system and the shaft seal inlet heater, and a water supply end of the third gate valve is connected to an inlet end of the orifice plate.
5. The apparatus for improving the performance of a sealed water supply system of a feed pump set of a thermal power plant as set forth in claim 4, wherein the outlet pipe of the booster pump is provided with a branch flow regulating pipe connected to the inlet pipe of the booster pump via a flow regulating valve.
6. The apparatus as claimed in claim 1, wherein the third regulating pipeline comprises a stop valve and a check valve between the condensed water pressure main pipe and the condensed water fine treatment system, and the water supply end of the check valve is connected with the inlet end of the orifice plate.
7. The apparatus for improving the performance of a sealed water supply system of a water feed pump set of a thermal power plant according to claim 3 or 4, wherein a boiler air supply temperature reduction water taking point, a condenser temperature reduction water taking point and other water taking points are arranged on the condensed water taking header pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022751965.8U CN213930438U (en) | 2020-11-24 | 2020-11-24 | Device for improving performance of sealed water supply system of water supply pump set of thermal power plant |
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| CN202022751965.8U CN213930438U (en) | 2020-11-24 | 2020-11-24 | Device for improving performance of sealed water supply system of water supply pump set of thermal power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114112200A (en) * | 2021-12-02 | 2022-03-01 | 中国电建集团贵州电力设计研究院有限公司 | Adjusting method of pipeline system for adjusting depressurization rate in boiler water overpressure experiment |
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2020
- 2020-11-24 CN CN202022751965.8U patent/CN213930438U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114112200A (en) * | 2021-12-02 | 2022-03-01 | 中国电建集团贵州电力设计研究院有限公司 | Adjusting method of pipeline system for adjusting depressurization rate in boiler water overpressure experiment |
| CN114112200B (en) * | 2021-12-02 | 2024-01-23 | 中国电建集团贵州电力设计研究院有限公司 | Method for adjusting pipeline system for adjusting depressurization rate in boiler water overpressure experiment |
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