CN218409903U - Power plant thermodynamic cycle system - Google Patents

Abstract

An embodiment of the present disclosure provides a power plant thermodynamic cycle system, the system including: the system comprises a boiler, a steam turbine, a condenser, an air extractor, a make-up water tank, a heating device, a deaerator and an oxygen discharge door controller; the condenser is communicated with the deaerator through a first water conveying pipeline, the deaerator is provided with an oxygen discharge door, the deaerator is communicated with the boiler through a second water conveying pipeline, the boiler is communicated with the steam turbine, and the steam turbine is communicated with the condenser; the air pump is communicated with the condenser through an air pumping pipeline; the heating device is used for heating the make-up water tank so as to heat the make-up water to the saturation temperature of the condenser under the working pressure; the oxygen exhaust door controller is electrically connected with the oxygen exhaust door and is used for controlling the oxygen exhaust door to close when the oxygen content in the deaerator is lower than a preset value. The make-up water is heated to the saturation temperature of the condenser under the working pressure, so that deoxygenation is facilitated, the oxygen discharge door is closed, heat and working medium discharge is reduced, and energy conservation and emission reduction are realized.

Description

Power plant thermal cycle system

Technical Field

The embodiment of the disclosure belongs to the technical field of power plant thermodynamic cycle, and particularly relates to a power plant thermodynamic cycle system.

Background

In order to ensure the safety, economy and flexibility of the unit operation, the conventional design of a general power plant thermodynamic cycle system usually consists of a plurality of subsystems which interact and work in coordination and have different functions, and mainly comprises a steam intermediate reheating system, a water supply regenerative system, an external heating system and the like.

The regenerative feedwater heating system is a system for extracting partial steam from the intermediate stage of the turbine with different pressures to heat condensed water and feedwater. The part of the work of the regenerative heat extraction with the extraction steam has no cold source loss, and is one of the main measures for improving the heat economy of the thermal power plant. Modern thermal power plants usually employ 7-8 (or even 9) regenerative heating systems.

And further, in order to ensure the continuous operation of the unit, a water supply unit is required to be arranged, but the deoxidation process of the water supply unit is generally completed under the working conditions of relatively high pressure, high temperature, relatively large discharged heat and relatively large discharged working medium.

For example, since the generation of power plants, the technology and management level of power plants are continuously improved, and the steam-water loss rate of a thermodynamic system in the production process of the power plants is reduced to 0.5-1.0%. At present, the biggest loss source is the working medium emission of the oxygen gate of oxygen-eliminating device, but must keep oxygen-eliminating device oxygen gate open state again in order to guarantee the requirement of working medium oxygen content among the thermodynamic cycle system. The reduction of the oxygen content of the steam-water working medium is to ensure that mechanical equipment of the system is prevented from being corroded, so that chemical treatment such as strict deoxidization, deionization and the like must be carried out on the make-up water, and the make-up water can be charged into the system to run after being qualified.

The prior art has at least the following problems: in a thermal cycle system, an oxygen discharge door of the deaerator is kept in an open state, the loss rate of a steam-water working medium is high, and large energy and working medium waste exists, so that the economic benefit of a power plant is restricted.

SUMMERY OF THE UTILITY MODEL

The embodiment of the disclosure aims to solve at least one of technical problems in the prior art and provides a thermal cycle system of a power plant.

One aspect of an embodiment of the present disclosure provides a power plant thermodynamic cycle system. The system comprises a thermal power generation subsystem, a thermal power terminal subsystem, a thermal power backheating subsystem and a thermal power supply subsystem; the thermal power generation subsystem comprises: boilers and steam turbines; the thermal power terminal subsystem includes: a condenser and an air extractor; the thermal energy power regenerative subsystem comprises: deaerator and oxygen discharge door controller; the thermal power replenishment subsystem comprises: a make-up water tank and a heating device; a condensed water outlet of the condenser is communicated with a make-up water inlet of the deaerator through a first water conveying pipeline, an exhaust outlet of the deaerator is provided with an oxygen exhaust door, a water supply outlet of the deaerator is communicated with a water supply inlet of the boiler through a second water conveying pipeline, a steam outlet of the boiler is communicated with a steam inlet of the steam turbine, and an exhaust outlet of the steam turbine is communicated with a steam inlet of the condenser;

the outlet of the make-up water tank is communicated with a make-up water inlet of the condenser through a make-up pipeline, and the inlet of the air pump is communicated with an exhaust outlet of the condenser through an air pumping pipeline; the heating device is used for heating the make-up water tank so as to heat the make-up water to a saturation temperature under the working pressure of the condenser; the oxygen discharge door controller is electrically connected with the oxygen discharge door and used for controlling the oxygen discharge door to be closed when the oxygen content in the deaerator is lower than a preset value.

Optionally, the heating device comprises a heat collector and a heat exchanger; the heat collector is connected with the heat exchanger; the heat collector is arranged on the outer side of the make-up water tank; the heat exchanger is arranged on the inner side of the make-up water tank.

Optionally, the system further comprises a temperature sensor and a temperature controller; the temperature sensor is arranged in the make-up water tank or the make-up pipeline and is electrically connected with the temperature controller; and the temperature controller is used for regulating and controlling the heating device to maintain the temperature of the replenishing water at the saturation temperature according to the temperature of the replenishing water detected by the temperature sensor.

Optionally, the system further comprises a water volume regulator; the water quantity regulator is serially arranged on the supply pipeline and used for regulating the supply water quantity conveyed to the condenser.

Optionally, a spray header is arranged in the condenser, the spray header is provided with a plurality of spray holes, and the spray header is communicated with a make-up water inlet of the condenser through a connecting pipe.

Optionally, the spraying range of the spray header at least covers 1/2 of the cross-sectional area of the condenser.

Optionally, the number of the spraying holes ranges from 10 to 30.

In the power plant thermodynamic cycle system disclosed by the embodiment of the disclosure, the makeup water input to the condenser is heated to the saturation temperature under the working pressure thereof, so that the oxygen can escape easily, the air exhauster directly removes oxygen during air exhaust, the oxygen content of the makeup water after oxygen removal is reduced, an oxygen discharge door is closed when the oxygen content is lower than a preset value, the heat and working medium discharge of the oxygen remover are reduced, and energy conservation and emission reduction are realized.

Drawings

Fig. 1 is a schematic structural diagram of a thermodynamic cycle system of a power plant according to an embodiment of the present disclosure.

In the figure:

100. a condenser; 110. a first water conveying pipeline; 120. a first condensate pump;

130. a fine desalted water tank; 140. a second condensate pump; 200. an air extractor; 210. an air extraction pipeline; 300. a deaerator; 310. a second water conveying pipeline; 320. a low pressure heater; 330. a high pressure heater; 340. a feed pump; 400. an oxygen discharge door; 500. a boiler;

600. a steam turbine; 700. a make-up water tank; 710. a supply line; 720. a water replenishing pump;

730. a water quantity regulator; 800. a heating device.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention is described in further detail below with reference to the accompanying drawings and the detailed description.

As shown in fig. 1, embodiments of the present disclosure relate to a power plant thermodynamic cycle system, the system comprising: the system comprises a thermal power generation subsystem, a thermal power terminal subsystem, a thermal power backheating subsystem and a thermal power supply subsystem; the thermal energy power generation subsystem comprises: a boiler 500 and a steam turbine 600; the thermal power terminal subsystem comprises: a condenser 100 and an ejector 200; the thermal energy power regenerative subsystem comprises: a deaerator 300 and an oxygen discharge door controller (not shown); the thermal energy power replenishment subsystem comprises: a make-up water tank 700 and a heating device 800. The condensate outlet of the condenser 100 is communicated with the feed water inlet of the deaerator 300 through a first water conveying pipeline 110, the exhaust outlet of the deaerator 300 is provided with an oxygen exhaust door 400, the feed water outlet of the deaerator 300 is communicated with the feed water inlet of the boiler 500 through a second water conveying pipeline 310, the steam outlet of the boiler 500 is communicated with the steam inlet of the steam turbine 600, and the exhaust steam outlet of the steam turbine 600 is communicated with the steam inlet of the condenser 100.

An outlet of the make-up water tank 700 is communicated with a make-up water inlet of the condenser 100 through a make-up pipeline 710, and an inlet of the air ejector 200 is communicated with an exhaust outlet of the condenser 100 through an air extraction pipeline 210; the heating device 800 is configured to heat the make-up water tank 700 to heat the make-up water to a saturation temperature of the condenser 100 under the operating pressure; the oxygen exhaust door controller is electrically connected with the oxygen exhaust door 400 and is used for controlling the oxygen exhaust door 400 to be closed when the oxygen content in the deaerator 300 is lower than a preset value.

As shown in fig. 1, the thermal energy power replenishment subsystem further comprises: the water replenishing pump 720, the water replenishing pump 720 may be disposed in the replenishing line 710. The make-up water in the make-up water tank 700 is water subjected to desalination, the make-up water tank 700 may be a desalination water tank for a power plant, and the desalination water tank may be disposed between water treatment units. The thermal energy power replenishment subsystem may further comprise: and the water replenishing controller is electrically connected with the water level meter of the deaerator, and the water replenishing pump 720 is electrically connected with the water replenishing controller. When the water level of the feed water in the deaerator 300 is lower than a preset threshold value, the water supplementing controller receives a feed water level signal, and controls the water supplementing pump to convey the feed water which is desalted and heated to the saturation temperature under the working pressure of the condenser to the condenser; the heating device 800 heats the make-up water temperature to the saturation temperature of the condenser 100 under the working pressure, and the gas dissolved in the make-up water reaches the lowest value in the physical state, so that the oxygen content of the make-up water is ensured to meet the index requirement.

The thermal power terminal subsystem further comprises: a first condensate pump 120, a fine desalted water tank 130, and a second condensate pump 140. The first condensate pump 120, the fine desalted water tank 130 and the second condensate pump 140 are sequentially disposed in the first water pipe 110 along a flow direction of makeup water. The first condensate pump 120 boosts the condensate and the make-up water in the condenser 100 and then sends the boosted condensate and the make-up water to the fine desalting water tank 130, the fine desalting water tank 130 further removes the salt of the make-up water after oxygen removal, and the boosted make-up water is sent to the heat energy power regenerative subsystem through the second condensate pump 140. The thermal power terminal subsystem further comprises: the condenser comprises a circulating water pump (not shown in the figure), a circulating water pipeline (not shown in the figure), a cooling water tower (not shown in the figure) and the like, wherein the circulating water pipeline is arranged in the condenser 100, the part of the circulating water pipeline, which extends out of the condenser 100, is provided with the circulating water pump, and two ends of the circulating water pipeline are communicated with the cooling water tower. The specific connection relationship between the circulating water pump, the circulating water pipeline and the cooling water tower is not described herein.

As an example, as shown in fig. 1, the thermal energy power regenerative subsystem further includes: a low pressure heater 320, a feed pump 340, and a high pressure heater 330; the low pressure heater 320 is disposed at the first water conveying pipeline 110. The feed water pump 340 and the high pressure heater 330 are respectively disposed on the second water pipe 310. The water supply pump is used for supplying water with a certain temperature and peroxide removal in the water storage tank of the deaerator, and the water is conveyed to the boiler after the pressure is increased so as to meet the requirement of water for the boiler. The low pressure heater with the high pressure heater can utilize partial extraction steam heating boiler feed water of steam turbine respectively, improves the power plant's thermal efficiency, improves the feedwater temperature, and then reduces the feedwater that gets into the boiler and the temperature of furnace, has reduced the heat transfer loss of difference in temperature, saves fuel to be favorable to unit safety operation. The specific structures and control connection relation technologies of the low-pressure heater, the feed pump and the high-pressure heater are mature, and are not described herein again. The deaerator 300 still is provided with the fluviograph, the fluviograph with the heat energy power supply subsystem electricity is connected, the fluviograph is used for detecting the water level of feeding in the deaerator 300, works as when the deaerator 300 water level of feeding is less than and predetermines the threshold value, the fluviograph send signal extremely the water supply controller of heat energy power supply subsystem, heat energy power supply subsystem will make up water and heat to carry behind the saturation temperature under the condenser operating pressure extremely condenser 100 carries out the deoxidization, transport extremely again deaerator 300. Be provided with the oxygen meter near the feedwater export in the oxygen-eliminating device 300, the oxygen meter with the oxygen door controller electricity is connected, the oxygen meter is arranged in monitoring the oxygen content of feedwater in the oxygen-eliminating device 300, works as when the oxygen content of feedwater is less than the default in the oxygen-eliminating device 300, when oxygen content quality index is less than the standard promptly, the oxygen door 400 self-closing of oxygen-eliminating device 300 reduces power plant thermodynamic cycle system's heat and working medium and discharges, the oxygen meter can be dissolved oxygen sensor. The specific volume, model and the like of the deaerator can be selected according to actual conditions, and the specific structure of the deaerator is not repeated here.

The working principle of the power plant thermodynamic cycle system is as follows: the heating device can operate independently of the unit, the heating device 800 can heat the make-up water tank 700 in advance, heat the make-up water to the saturation temperature under the operating pressure of the condenser 100, or heat the make-up water to 2-4 degrees higher than the saturation temperature, adjust the heating make-up water temperature according to the actual situation, and keep the make-up water temperature at the saturation temperature; when a unit is started, heated make-up water is conveyed to the condenser 100, and because the temperature of the make-up water is the saturation temperature of the condenser 100 under the working pressure, after the make-up water enters the condenser 100, gas in the make-up water easily escapes, and the air pump 200 pumps out gas such as oxygen and the like escaping from the condenser 100 at the same time, so that the vacuum state of the condenser 100 is maintained; the deaerated make-up water and the condensed water form the boiler 500 feed water and are conveyed to the deaerator 300, the oxygen detector in the deaerator 300 detects the oxygen content of the boiler 500 feed water and sends detection information to the oxygen exhaust door controller, when the oxygen content of the boiler 500 feed water is lower than a preset value, the oxygen exhaust door controller controls the oxygen exhaust door 400 to close, otherwise, the oxygen exhaust door 400 is opened; in a general situation, in a unit starting stage, although the condenser 100 performs deoxygenation, the oxygen content of the make-up water entering the deoxygenator 300 may exceed the preset oxygen content value of the deoxygenator 300, at this time, the oxygen discharge door 400 is opened to discharge the gas in the deoxygenator 300; after the unit normally operates, the heating device maintains the temperature of the make-up water at the saturation temperature of the condenser under the working pressure, and the heating device can automatically operate as required to continuously heat the make-up water in the make-up water tank so as to ensure that the make-up water heated to the saturation temperature can be supplied at any time when the make-up water is required; when the water level meter detects that the water level of the feed water in the deaerator 300 is lower than a preset threshold value and the feed water is required to be supplemented, the water level meter sends a signal to the water supplementing controller, the water supplementing controller conveys the feed water heated to the saturation temperature under the working pressure of the condenser 100 to the condenser 100, after the feed water at the saturation temperature enters the condenser 100, gas easily escapes and is extracted by the air extractor 200, and the oxygen content of the condensed water in the condenser 100 is lower, so that the oxygen content standards of the condensed water and the feed water are ensured; the boiler 500 water which is deaerated by the condenser is input to the deaerator 300, the oxygen content of the water fed into the deaerator 300 is basically ensured to be lower than a preset value, and the oxygen discharge door 400 is ensured to be closed. In a unit starting stage under a general condition, a water treatment working condition is mainly performed, the make-up water input to the deaerator 300 is deaerated, the oxygen content is low, the oxygen discharge door 400 can be opened a little, and the opening size of the oxygen discharge door 400 can be adjusted according to an actual condition; along with the operation of a unit, the condensed water from a steam turbine 600 in the condenser 100 is increased, the make-up water entering the condenser 100 is subjected to deoxygenation, so that the oxygen content of the feed water input into a boiler 500 of the deaerator 300 is reduced, the closed state of an oxygen discharge door 400 can be basically maintained, after the oxygen discharge door is closed, the discharged working media such as steam and water are reduced, the amount of the make-up water or the number of times of the make-up water to be supplemented can be reduced, the oxygen brought in by the make-up water can be reduced, the condenser can completely meet the deoxygenation work, so that the oxygen content of the make-up water input into the deaerator is lower than a preset value, the oxygen discharge door is kept closed, the steam and water loss of a power plant is reduced, and the purposes of energy conservation and emission reduction are achieved,

the embodiment of the disclosure achieves the aim of completing the deoxidation of the working medium without heat and working medium emission in the test stage and the actual use, thereby not only ensuring that the working medium meets the standard requirements, but also completing the purposes of energy conservation and emission reduction.

For example, the oxygen discharge door 400 of the deaerator 300 of the thermal cycle system of a general thermal generator set is normally opened to control the oxygen content of the working medium of the thermal cycle system within a standard range. The result is that the steam-water loss reaches more than 50% or even more of the total steam-water loss of the thermodynamic cycle system. Taking a 600MWe unit as an example, taking the low value of the steam-water loss rate of the unit as 0.5%, namely 9 tons/hour, after closing the oxygen discharge gate, conservative estimation can reduce the steam-water loss rate to 0.25%, namely 4.5 tons/hour at least, the heat loss is 240 ten thousand kilocalories/hour, and about 0.345 tons/hour of nuclear standard coal. After the oxygen discharge door is closed by utilizing the embodiment disclosed by the invention, the flow of a thermodynamic cycle system is reduced under the same working condition, and if the flow is calculated according to 6000 hours of annual equivalent utilization of a unit, the flow is reduced to about 2000 tons/year of standard coal; the amount is 27000 tons per year in terms of desalted water. According to statistics, the 600MWe units in China are up to 630 units, only the improvement can save 126 ten thousand tons of standard coal, 1700 ten thousand tons of demineralized water and CO ₂ 462 million tons are discharged. 137 1000WMe thermal generating sets and 900 300WMe thermal generating sets exist nationwide, and the improvement is implementedThe effects of energy conservation and emission reduction are more huge.

The embodiment of the disclosure can keep the oxygen discharge door in a normally closed state by improving the operation mode of the oxygen discharge door of the deaerator of the thermal power plant thermal power cycle system and the thermal power cycle system, and the oxygen content of the working medium is ensured to meet the quality index requirement, so that the steam-water loss of a power plant is reduced, and the national energy conservation and emission reduction is made contribution.

Illustratively, as shown in fig. 1, the heating device 800 includes a heat collector (not shown) and a heat exchanger (not shown); the heat collector is connected with the heat exchanger; the heat collector is arranged on the outer side of the make-up water tank 700; the heat exchanger is disposed inside the supplementary water tank 700.

As an example, the thermodynamic cycle system may utilize a solar photovoltaic/photothermal device or the like to heat the make-up water in the make-up water tank 700, so as to save energy, be convenient to use, and complement energy conservation and emission reduction of the embodiment of the present disclosure.

Illustratively, the system further comprises a temperature sensor (not shown in the figures) and a temperature controller (not shown in the figures); the temperature sensor is arranged in the make-up water tank 700 or the make-up pipeline 710 and is electrically connected with the temperature controller; the temperature controller is configured to regulate and control the heating device 800 to maintain the temperature of the makeup water at the saturation temperature according to the temperature of the makeup water detected by the temperature sensor.

As an example, the temperature controller may be electrically connected to the makeup water controller, and the makeup water controller may transmit a saturation temperature corresponding to the operating pressure of the condenser 100 to the temperature controller, and the temperature controller may control the heating device 800 to maintain the makeup water temperature at the saturation temperature. Generally, the condenser keeps vacuum or the working pressure is extremely low, the saturation temperature of the make-up water is only dozens of degrees, and different condensers correspond to different saturation temperatures, which is not described herein. The embodiment of the disclosure adopts the temperature sensor and the temperature controller can ensure the heating temperature of the make-up water and ensure the continuous and effective circulation of the thermodynamic cycle system.

Illustratively, as shown in fig. 1, the system further includes a water volume regulator 730; the water quantity regulator 730 is serially connected to the supply pipeline 710, and is configured to regulate the supply water quantity delivered to the condenser 100.

As an example, the water quantity controller 730 may be electrically connected to the water supply controller, and the water quantity controller 730 may adjust the amount of the supply water to be supplied to the condenser 100 according to the amount of the supply water obtained by the water supply controller. The water volume regulator 730 may be an ultrasonic flow meter, which may be a doppler ultrasonic flow meter. The ultrasonic flowmeter is suitable for the flow measurement of the pipeline, can measure the flow of various liquids and sewage, has a large measurement range, only needs to be clamped on the outer wall of the pipeline, and is very convenient to install, so that when the pipeline is adopted for water inlet, the accuracy of monitoring obtained data can be further improved by adopting the ultrasonic flowmeter, and the convenience of assembly can be improved. The water quantity regulator 730 can also be a fluid metering pump, and the functions of conveying, metering and regulating can be simultaneously completed by using the fluid metering pump, so that the production process flow is simplified. The person skilled in the art can select relevant devices as the water quantity regulator according to actual conditions. Adopt water yield regulator can reduce the water supply volume in the unit interval, extension water supply time to do benefit to the water supply and get into gaseous abundant effusion behind the condenser keeps the water supply volume to satisfy thermodynamic cycle system's requirement, becomes the long water supply when wholesale benefit is the right amount promptly, reaches fully to discharge the gas in the water supply again. The specific water supply amount can be regulated and controlled according to actual conditions.

Illustratively, a spray header (not shown in the figure) is arranged in the condenser 100, the spray header is provided with a plurality of spray holes, and the spray header is communicated with a make-up water inlet of the condenser 100 through a connecting pipe; the spraying range of the spray header at least covers 1/2 of the cross section area of the condenser 100; the number of the spraying holes ranges from 10 to 30.

As an example, spray header sprays are covered above the condenser tubes in the condenser 100, and/or the spray header spray range covers at least 1/2 of the cross-sectional area of the condenser 100, and specifically, the number of spray holes of the spray header may be set according to the type of the unit. Taking a 600MWe unit as an example, the spray header can be provided with at least 20 spray holes. According to the embodiment of the disclosure, the number of the spraying holes is increased, the radial size of the spraying head is increased, the spraying range is enlarged, and the vacuum degree of the thermal circulation system is ensured to meet the requirements of the technical specification of the power plant.

Another aspect of the embodiments of the present disclosure provides a method for thermodynamic cycle of a power plant, where the method for thermodynamic cycle of a power plant includes: the heating device 800 heats the make-up water in the make-up water tank 700 to a saturation temperature under the operating pressure of the condenser 100; the makeup water heated to the saturation temperature is input to the condenser 100 through the makeup line 710, and the air extractor 200 extracts air and removes oxygen from the condenser 100 through the air extraction line 210.

The condenser 100 inputs the deaerated makeup water to the deaerator 300 through the first water conveying pipeline 110; the deaerator 300 inputs the deaerated makeup water to the boiler 500 through a second water pipeline 310, and the boiler 500 operates to input the generated steam to the steam turbine 600; steam discharged by the steam turbine 600 enters the condenser 100 to be condensed into water to be circulated and provide feed water for the boiler 500; wherein, the oxygen discharge door controller is used for controlling the oxygen discharge door 400 to close when the oxygen content in the oxygen remover 300 is lower than a preset value.

As an example, the make-up water is heated in the make-up water tank 700 to the saturation temperature of the condenser 100 under the operating pressure, the make-up water entering the condenser 100 is extracted and deoxygenated by the air extractor 200, so that the deoxygenation of the make-up water in the condenser 100 is completed, and after the make-up water is input to the deoxygenator 300, the oxygen content is low, and the oxygen discharge door 400 is kept closed during the normal operation of the unit. The oxygen exhaust door can be controlled by an oxygen exhaust door controller additionally arranged on the deaerator, so that the oxygen exhaust door can be automatically closed or opened, and the specific air exhaust time and the like can be adjusted according to actual conditions. According to the embodiment of the disclosure, the energy conservation and emission reduction of the coal-fired power plant are realized by improving the equipment and the operation method of the thermal cycle system of the power plant, and the carbon neutralization is made contribution in 2030 years of carbon peak reaching 2060 years of China. The thermodynamic cycle system is simple in structure, the existing equipment can be fully utilized to be properly improved, the thermodynamic cycle method of the embodiment of the disclosure is realized, the steam-water emission of the working medium of the deaerator is reduced, and the purposes of energy conservation and emission reduction are achieved.

For example, when the system further includes a temperature sensor and a temperature controller, the heating device 800 heats the make-up water in the make-up water tank 700 to a saturation temperature at the operating pressure of the condenser 100, and includes: the sensor detects the temperature of the make-up water in the make-up water tank 700 or the make-up piping; the controller regulates the heating device 800 according to the received makeup water temperature to maintain the makeup water temperature at the saturation temperature.

As an example, the embodiment of the disclosure can realize continuous heating of the make-up water, the make-up water is automatically heated to the saturation temperature without manual operation, the heating is timely and accurate, and the continuous operation of the unit is ensured.

Illustratively, when the system further comprises a water volume regulator 730, the method further comprises: the amount of makeup water to be supplied to the condenser 100 is adjusted by the water amount adjuster 730.

As an example, unlike water replenishment performed at a time, the embodiment of the present disclosure may prolong the time of water replenishment by reducing the amount of internal water replenishment per unit time, so as to facilitate the escape of gas in the water replenishment, ensure that the condenser is sufficiently deoxygenated, and reduce the oxygen content of the water replenishment. The specific reduction of the water supply amount in unit time can be set according to actual conditions, which is not described herein. By adopting the thermodynamic cycle method disclosed by the embodiment of the disclosure, the steam-water discharge of the working medium of the deaerator can be effectively reduced, and the energy conservation and emission reduction are realized. Make contribution to national energy conservation and emission reduction.

It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and scope of the invention, and such modifications and improvements are also considered to be within the scope of the invention.

Claims (7)

1. A power plant thermodynamic cycle system, the system comprising: the system comprises a thermal power generation subsystem, a thermal power terminal subsystem, a thermal power backheating subsystem and a thermal power supply subsystem; the thermal energy power generation subsystem comprises: boilers and steam turbines; the thermal power terminal subsystem comprises: a condenser and an air extractor; the thermal energy power regenerative subsystem comprises: deaerator and oxygen discharge door controller; the thermal energy power replenishment subsystem comprises: a make-up water tank and a heating device;

a condensed water outlet of the condenser is communicated with a make-up water inlet of the deaerator through a first water conveying pipeline, an exhaust outlet of the deaerator is provided with an oxygen exhaust door, a water supply outlet of the deaerator is communicated with a water supply inlet of the boiler through a second water conveying pipeline, a steam outlet of the boiler is communicated with a steam inlet of the steam turbine, and an exhaust outlet of the steam turbine is communicated with a steam inlet of the condenser;

the outlet of the make-up water tank is communicated with a make-up water inlet of the condenser through a make-up pipeline, and the inlet of the air pump is communicated with an exhaust outlet of the condenser through an air pumping pipeline;

the heating device is used for heating the make-up water tank so as to heat the make-up water to a saturation temperature under the working pressure of the condenser;

the oxygen discharge door controller is electrically connected with the oxygen discharge door and used for controlling the oxygen discharge door to be closed when the oxygen content in the deaerator is lower than a preset value.

2. The system of claim 1, wherein the heating device comprises a heat collector and a heat exchanger; the heat collector is connected with the heat exchanger;

the heat collector is arranged on the outer side of the make-up water tank; the heat exchanger is arranged on the inner side of the make-up water tank.

3. The system of claim 1, further comprising a temperature sensor and a temperature controller;

the temperature sensor is arranged in the make-up water tank or the make-up pipeline and is electrically connected with the temperature controller;

and the temperature controller is used for regulating and controlling the heating device to maintain the temperature of the replenishing water at the saturation temperature according to the temperature of the replenishing water detected by the temperature sensor.

4. The system of any one of claims 1 to 3, further comprising a water volume regulator;

the water quantity regulator is serially arranged on the supply pipeline and used for regulating the supply water quantity conveyed to the condenser.

5. The system according to any one of claims 1 to 3, wherein a spray header is arranged in the condenser, the spray header is provided with a plurality of spray holes, and the spray header is communicated with a make-up water inlet of the condenser through a connecting pipe.

6. The system of claim 5, wherein the spray header spray range covers at least 1/2 of the cross-sectional area of the condenser.

7. The system of claim 6, wherein the number of spray holes ranges from 10 to 30.

Images