CN213574264U - Steam turbine power generation system - Google Patents

Abstract

The application discloses steam turbine power generation system belongs to thermal power generation technical field. In the disclosed steam turbine power generation system, the first end of the main steam extraction pipe is communicated with the main steam turbine, the first end of the first steam extraction branch pipe and the first end of the second steam extraction branch pipe are connected to the second end of the main steam extraction pipe in parallel, the second end of the first steam extraction branch pipe is communicated with the deaerator, the second end of the second steam extraction branch pipe is communicated with the water feeding pump steam turbine, the first steam extraction branch pipe is provided with a first quick-closing check valve and a first electric isolating valve, the first quick-closing check valve and the first electric isolating valve are sequentially arranged in the steam extraction direction of the first steam extraction branch pipe, and the conduction direction of the first quick-closing check valve is consistent with the steam extraction direction of the first steam extraction branch pipe. Above-mentioned scheme can solve among the background art can lead to water to enter into the main steam turbine after the oxygen-eliminating device is full of water, and then produces the trouble relatively easily, causes the problem that the feed pump steam turbine can not normally work.

Description

Steam turbine power generation system

Technical Field

The application belongs to the technical field of thermal power generation, and particularly relates to a steam turbine power generation system.

Background

The deaerator is a device for removing dissolved oxygen contained in boiler feed water, and plays an important role in a steam turbine power generation system. The deaerator can protect the boiler to avoid oxygen corrosion, but meanwhile, the deaerator also has certain hidden danger, and once the deaerator is full of water, water can enter the main steam turbine, so that faults are easily generated, and the water supply pump steam turbine can not work normally.

SUMMERY OF THE UTILITY MODEL

The purpose of the embodiment of the application is to provide a steam turbine power generation system, can solve among the background art can lead to water to enter into the main steam turbine after the oxygen-eliminating device is full of water, and then produce the trouble relatively easily, cause the problem that the feed pump steam turbine can not normally work.

In order to solve the technical problem, the present application is implemented as follows:

in a first aspect, an embodiment of the present application provides a steam turbine power generation system, which includes a main steam turbine, a main steam extraction pipe, a first branch steam extraction pipe, a second branch steam extraction pipe, a deaerator, and a feed water pump steam turbine, wherein the first end of the main steam extraction pipe is communicated with the main turbine, the first end of the first branch steam extraction pipe and the first end of the second branch steam extraction pipe are connected in parallel at the second end of the main steam extraction pipe, the second end of the first steam extraction branch pipe is communicated with the deaerator, the second end of the second steam extraction branch pipe is communicated with the water feeding pump turbine, the first steam extraction branch pipe is provided with a first quick-closing check valve and a first electric isolating valve which are sequentially arranged in the steam extraction direction of the first steam extraction branch pipe, and the conduction direction of the first quick-closing check valve is consistent with the steam extraction direction of the first steam extraction branch pipe.

The steam turbine power generation system that this application embodiment discloses improves through the structure to the steam turbine power generation system in the background art, through add first quick check valve that closes on first steam extraction branch pipe to under the unusual circumstances such as deaerator full water, can play the effect of quick closing, thereby can solve the deaerator in case full water can lead to the problem that water enters into the main steam turbine. Simultaneously, first electronic isolation valve can play further isolation to with the cooperation of first quick-closing check valve, reach the purpose of isolated water betterly. Therefore, the steam turbine power generation system disclosed by the embodiment of the application can rapidly realize a better isolation and blocking function, and can avoid the occurrence of faults caused by water inflow of the main steam turbine.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic structural diagram of a steam turbine power generation system according to an embodiment of the present application.

Description of reference numerals:

100-main steam extraction pipe, 110-third quick-closing check valve;

200-a first steam extraction branch pipe, 210-a first quick-closing check valve, 220-a first electric isolating valve and 230-a first mechanical check valve;

300-a second steam extraction branch pipe, 310-a second quick-closing check valve, 320-a second electric isolation valve, 330-a quick-closing valve, 340-a steam flow regulating valve and 350-a flow measuring device;

400-a deaerator;

500-feed pump turbine;

600-a first hydrophobic pipeline, 610-a first hydrophobic regulating valve, 620-a first hydrophobic isolation valve;

700-a second hydrophobic pipeline, 710-a second hydrophobic regulating valve, 720-a second hydrophobic isolation valve;

800-auxiliary steam inlet pipeline, 810-switch valve.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.

As shown in fig. 1, an embodiment of the present application discloses a steam turbine power generation system, which includes a main turbine, a main steam extraction pipe 100, a first branch steam extraction pipe 200, a second branch steam extraction pipe 300, a deaerator 400, and a feed water pump turbine 500.

The main turbine is a core part of the steam turbine power generation system, and in the working process, steam generated by a boiler of the steam turbine power generation system can push the main turbine to rotate so as to realize power generation. The first end of the main extraction pipe 100 is in communication with the main turbine, through which steam is then admitted into the main extraction pipe 100.

The first end of the first branch steam extraction pipe 200 and the first end of the second branch steam extraction pipe 300 are connected in parallel to the second end of the main steam extraction pipe 100, so that steam in the main turbine flows through the main steam extraction pipe 100 and then enters the first branch steam extraction pipe 200 and the second branch steam extraction pipe 300 respectively, and further provides required steam for branch pipelines. The second end of first steam extraction branch pipe 200 communicates with oxygen-eliminating device 400, and oxygen-eliminating device 400 generally adopts the method of thermal power deoxidization, promptly heats the temperature that water improved with steam, and then makes the partial pressure of steam on the surface of water progressively increase, and under this condition, the partial pressure of steam on the surface of water of the inside of oxygen-eliminating device 400 increases gradually, and the gas of dissolving in aquatic will constantly escape to can detach the oxygen of aquatic, thereby can avoid entire system to receive the oxygen corruption.

The second end of the second steam extraction branch pipe 300 is communicated with a feed pump turbine 500, the feed pump turbine 500 is a turbine for driving a feed pump, and the turbine drives the feed pump, thereby realizing that the feed pump delivers water to a turbine power generation system.

First branch extraction pipe 200 is provided with first fast check valve 210 and electronic isolation valve 220 of closing, the switching-on direction of first fast check valve 210 is unanimous with the extraction direction of first branch extraction pipe 200, under this condition, make the steam of main steam turbine reach the mesh of oxygen in getting rid of the oxygen-eliminating device 400 smoothly in reaching the oxygen-eliminating device 400, under the unusual circumstances such as oxygen-eliminating device 400 is full of water simultaneously, can realize intercepting the water flow in first branch extraction pipe 200 and be responsible for 100 to the extraction when closing first fast check valve 210, and then the prevention main steam turbine breaks down.

First quick-closing check valve 210 compares in ordinary check valve, except the effect that can prevent the medium refluence after closing, still can utilize simultaneously pneumatic mechanism or hydraulic pressure mechanism to realize supplementary closing as assist drive device, and then reach the effect of quick closing, and then under the unusual circumstances such as oxygen-eliminating device 400 full water, can close the valve fast, and then carry out more swift isolation to the water in oxygen-eliminating device 400, the water of avoiding oxygen-eliminating device 400 gets into and takes out steam main pipe 100 after reentrant main turbine, and then causes the trouble and influences main turbine's normal operating. It should be noted that the first quick-closing check valve 210 can block the first steam extraction branch pipe 200 after being closed, and if the steam pressure of the steam extraction main pipe 100 is high, the first quick-closing check valve 210 can be pushed open, so that one-way opening is realized.

First electronic isolation valve 220 has good isolation effect, compares in the valve of general switch class, and its security requires more highly, and when the oxygen-eliminating device 400 abnormal conditions such as full water appear, the closing of first electronic isolation valve 220 can realize more effective isolation between oxygen-eliminating device 400 and the main steam turbine.

Specifically, first fast check valve 210 and electronic isolation valve 220 of closing can set gradually in the extraction direction of first extraction branch pipe 200, and then make first electronic isolation valve 220 can assist under the abnormal conditions such as oxygen-eliminating device 400 full water and block, the too big problem of water pressure that first fast check valve 210 received when avoiding the oxygen-eliminating device 400 full water condition.

The steam turbine power generation system that this application embodiment discloses improves through the structure to the steam turbine power generation system in the background art, through add first quick check valve 210 that closes on first steam extraction branch pipe 200 to under the unusual circumstances such as the deaerator 400 full water, can play the effect of quick shutoff, thereby can solve deaerator 400 in case the full water can lead to water to enter into the problem of main turbine. Meanwhile, the first electric isolation valve 220 can play a further isolating role, so that the first electric isolation valve is matched with the first quick-closing check valve 210 to achieve a better water isolating effect. Therefore, the steam turbine power generation system disclosed by the embodiment of the application can rapidly realize a better isolation and blocking function, and can avoid the occurrence of faults caused by water inflow of the main steam turbine.

The steam extraction main pipe 100 of the steam turbine power generation system disclosed in the embodiment of the application can also be provided with a third quick-closing check valve 110, which is the same as the first quick-closing check valve 210, and compared with a common check valve, besides the function of preventing medium diversion after closing, an auxiliary closing can be realized by utilizing an air pressure structure or a hydraulic mechanism and other assistance mechanisms, so that the effect of quick closing is achieved, and the closing of the steam extraction main pipe 100 can be quickly controlled.

Specifically, the conduction direction of the third quick-closing check valve 110 is the same as the steam extraction direction of the steam extraction main pipe 100. Under the circumstances, make the steam of main steam turbine can reach in oxygen-eliminating device 400 and the feed pump steam turbine 500 smoothly through steam extraction main pipe 100, simultaneously under the abnormal conditions such as oxygen-eliminating device 400 full water, can close third quick-closing check valve 110, and then realize further intercepting the rivers in the first steam extraction branch pipe 200 and flow to main steam turbine to steam extraction main pipe 100 then, and then prevent that main steam turbine breaks down. Of course, under the abnormal conditions of the deaerator 400 being full of water and the like, only the first quick-closing check valve 210 can be closed, and the third quick-closing check valve 110 is kept open, so that the steam can not be influenced to enter the feed pump turbine 500 through the second steam extraction branch pipe 300, and the normal operation of the feed pump turbine 500 can not be influenced.

The steam turbine power generation system disclosed in the embodiment of the present application can further include a first drain pipe 600, and the first drain pipe 600 can drain away the condensate water produced by the first steam extraction branch pipe 200, thereby reducing the harm of the condensate water to the valve. One end of the first drain pipe 600 may be connected to the first steam extraction branch pipe 200 at a position between the first electric isolation valve 220 and the first quick-closing check valve 210, and since the density of water is greater than that of steam, the kinetic energy generated by the first electric isolation valve is also greater under the same condition, under such a condition, drainage is performed before the first electric isolation valve 220, so that a water hammer can be prevented from being formed by the condensed water of the steam, damage to the first electric isolation valve 220 when the steam turbine power generation system operates again can be avoided, and further, the service life of the first electric isolation valve 220 can be prevented from being influenced.

In a further technical solution, the first drain pipe 600 may be provided with a first drain regulating valve 610, and the first drain regulating valve 610 may be a pressure reducing valve, which may convert hot condensed water into secondary steam by reducing pressure, so that the condensed water is reused; or a common flow regulating valve, thereby regulating the discharge flow of the condensed water.

In a further technical solution, the first hydrophobic pipeline 600 may be further provided with a first hydrophobic isolation valve 620. The first hydrophobic isolation valve 620 plays a role in draining the condensed water and closing and isolating the condensed water if necessary, thereby implementing an auxiliary function of the first hydrophobic adjustment valve 610 on the first hydrophobic pipeline 600. Meanwhile, the first hydrophobic isolation valve 620 has better isolation performance, and the first hydrophobic isolation valve 620 and the first hydrophobic adjustment valve 610 cooperatively play a role in controlling the on-off of the first hydrophobic pipeline 600 more stably.

In the steam turbine power generation system disclosed in the embodiment of the present application, a first mechanical check valve 230 may be disposed at a position between the first electric isolation valve 220 and the deaerator 400 on the first steam extraction branch pipe 200, and the first mechanical check valve 230 is a check valve without a power assisting mechanism, so that the operation is more stable. When the first quick-closing check valve 210 fails, the first mechanical check valve 230 is closed, so that water in the deaerator 400 cannot flow back, and the main turbine can be prevented from being damaged; when the first quick-closing check valve 210 works normally, the first mechanical check valve 230 can enhance the check and isolation effects on water in the first steam extraction branch pipe 200, so that the main turbine can operate normally.

In the steam turbine power generation system disclosed in the embodiment of the present application, the second steam extraction branch pipe 300 can be provided with the second electric isolation valve 320 and the second quick-closing check valve 310, the second quick-closing check valve 310 is compared with a common check valve, except for the effect of preventing the medium from flowing backwards after closing, an auxiliary closing can be realized by using a pneumatic mechanism or a hydraulic mechanism as a power assisting mechanism, and then the effect of quick closing is achieved, and then the steam source of the feed water pump steam turbine 500 is cut to the auxiliary steam to come the steam pipeline 800 and can be quickly closed, and then the quick starting of the feed water pump steam turbine 500 is realized, and the utilization efficiency of the auxiliary steam is improved.

The second electric isolation valve 320 has a good isolation effect, and compared with a general switch type valve, the safety requirement is higher, when the steam source of the water supply pump steam turbine 500 is switched to the auxiliary steam incoming pipeline 800, the second electric isolation valve 320 can be quickly closed, so that the water supply pump steam turbine 500 can be quickly started, and the utilization efficiency of the auxiliary steam is improved. This is suitable for a situation where the main turbine does not discharge steam when the steam turbine power generation system is started, and it is necessary to supply the steam for starting to the feed pump turbine 500 through the auxiliary steam supply pipe 800.

In a further embodiment, the second electric isolation valve 320 and the second quick-closing check valve 310 may be sequentially disposed in the steam extraction direction of the second steam extraction branch pipe 300.

In the steam turbine power generation system disclosed in the embodiment of the present application, a quick closing valve 330 and a steam flow regulating valve 340 may be sequentially disposed between the second quick closing check valve 310 and the feed water pump turbine 500. The second quick-closing check valve 310 can rapidly close the steam inlet of the feed water pump turbine 500 in an emergency state, so that the unit is safely stopped, the steam flow regulating valve 340 can be used for regulating the flow of the steam, and further the steam parameters in the second steam extraction branch pipe 300 are suitable for the running condition of the feed water pump turbine 500. The quick-closing valve 330 serves to quickly shut off all air supplies to the feedwater pump turbine 500.

The steam turbine power generation system disclosed in the embodiment of the present application may further include a second drain pipe 700, and the second drain pipe 700 may drain away the condensed water generated by the second steam extraction branch pipe 300, thereby reducing the harm of the condensed water to the valve. One end of the second drainage pipe 700 may be connected to the second steam extraction branch pipe 300 at a position between the second quick-closing check valve 310 and the quick-closing valve 330, and since the density of water is greater than that of steam, the kinetic energy generated by the water is also greater under the same condition, in this case, drainage is performed before the quick-closing valve 330, so that a water hammer can be prevented from being formed by the condensed water of the steam, and the steam turbine power generation system is prevented from damaging the quick-closing valve 330 during the operation again, and further, the service life of the quick-closing valve 330 can be prevented from being affected.

In a further technical scheme, a second drain regulating valve 710 may be disposed on the second drain pipe 700, and the second drain regulating valve 710 may be a pressure reducing valve, which may convert hot condensed water into secondary steam by reducing pressure, so that the condensed water is reused; or a common flow regulating valve, thereby regulating the discharge flow of the condensed water.

In a further technical solution, the second hydrophobic pipeline 700 may further be provided with a second hydrophobic isolation valve 720, and the second hydrophobic isolation valve 720 plays a role in draining condensed water and closing and isolating the condensed water when necessary, so as to implement an auxiliary function of the second hydrophobic adjustment valve 710 on the second hydrophobic pipeline 700. Meanwhile, the second hydrophobic isolation valve 720 has better isolation performance, and the second hydrophobic isolation valve 720 and the second hydrophobic adjustment valve 710 cooperatively play a role in controlling the on-off of the second hydrophobic pipeline 700 more stably.

In the steam turbine power generation system disclosed in the embodiment of the present application, the second steam extraction branch pipe 300 may be provided with a flow measurement device 350, and the flow measurement device 350 may measure and display the flow of steam in the second steam extraction branch pipe 300, so as to monitor the steam flow.

In the steam turbine power generation system disclosed in the embodiment of the present application, the steam turbine power generation system may further include an auxiliary steam supply pipeline 800, the auxiliary steam supply pipeline 800 provides steam for starting the water feed pump steam turbine 500 when the main steam turbine is not yet started to operate, and then the auxiliary water feed pump steam turbine 500 enters a normal operation stage, and the auxiliary steam supply pipeline 800 may also serve as an auxiliary steam source when the system is stopped, and then the system is safely and stably stopped. The auxiliary steam supply line 800 is connected to an auxiliary steam source, which is typically an auxiliary boiler different from the main boiler in the steam turbine power generation system.

In a further technical scheme, the auxiliary steam inlet pipeline 800 may be provided with a switch valve 810, the switch valve 810 may control on-off of the auxiliary steam inlet pipeline 800, the switch valve 810 is opened when the system needs auxiliary steam, and the switch valve 810 is closed when the system does not need auxiliary steam, so that effective control of the auxiliary steam inlet pipeline 800 is realized.

It should be noted that the valves referred to herein are all existing products, and for brevity of the text, the description is omitted here.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. The utility model provides a steam turbine power generation system, its characterized in that includes main steam turbine, the main steam extraction pipe (100), first branch steam extraction pipe (200), second branch steam extraction pipe (300), oxygen-eliminating device (400) and feed water pump steam turbine (500), wherein, the main steam extraction pipe (100) the first end with main steam turbine intercommunication, the first end of first branch steam extraction pipe (200) with the first end parallel connection of second branch steam extraction pipe (300) is in the second end of the main steam extraction pipe (100), the second end of first branch steam extraction pipe (200) with oxygen-eliminating device (400) intercommunication, the second end of second branch steam extraction pipe (300) with feed water pump steam turbine (500) intercommunication, first branch steam extraction pipe (200) is provided with first fast check valve (210) and first electronic isolating valve (220), first fast check valve (210) with first electronic isolating valve (220) set gradually in the steam extraction direction of first branch steam extraction pipe (200), the conduction direction of the first quick-closing check valve (210) is consistent with the steam extraction direction of the first steam extraction branch pipe (200).

2. The steam turbine power generation system according to claim 1, wherein the main steam extraction pipe (100) is provided with a third quick-closing check valve (110), and a communication direction of the third quick-closing check valve (110) is identical to a steam extraction direction of the main steam extraction pipe (100).

3. The steam turbine power generation system of claim 1, further comprising a first steam trap pipe (600), one end of the first steam trap pipe (600) being connected to the first steam extraction branch pipe (200) at a position between the first electric isolation valve (220) and the first quick-closing check valve (210), the first steam trap pipe (600) being provided with a first trap regulating valve (610).

4. A steam turbine power generation system according to claim 3, characterized in that the first hydrophobic conduit (600) is further provided with a first hydrophobic isolation valve (620).

5. The steam turbine power generation system of claim 3, wherein a first mechanical check valve (230) is disposed on the first steam extraction branch (200) at a location between the first electrically-operated isolation valve (220) and the deaerator (400).

6. The steam turbine power generation system according to claim 1, wherein the second branch extraction pipe (300) is provided with a second electrically operated isolation valve (320) and a second quick-closing check valve (310), and the second electrically operated isolation valve (320) and the second quick-closing check valve (310) are sequentially arranged in the extraction direction of the second branch extraction pipe (300).

7. The steam turbine power generation system of claim 6, wherein a quick-closing valve (330) and a steam flow regulating valve (340) are sequentially disposed between the second quick-closing check valve (310) and the feed pump turbine (500).

8. The steam turbine power generation system of claim 7, further comprising a second steam trap (700), wherein one end of the second steam trap (700) is connected between the second quick-closing check valve (310) and the quick-closing valve (330), and a second steam trap isolation valve (720) and a second steam trap regulating valve (710) are disposed on the second steam trap (700).

9. Steam turbine power generation system according to claim 6, characterized in that the second steam extraction branch (300) is provided with a flow measuring device (350).

10. The steam turbine power generation system according to claim 1, further comprising an auxiliary steam supply line (800), the auxiliary steam supply line (800) being provided with a switching valve (810).

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