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

A power plant thermodynamic cycle system

technical field

The embodiments of the present disclosure belong to the technical field of thermal cycle of power plants, and specifically relate to a thermal cycle system of a power plant.

Background technique

In order to ensure the safe, economical and flexible operation of the unit, the traditional design of the thermodynamic cycle system of a general power plant is usually composed of several subsystems that interact and coordinate with each other and have different functions, mainly including steam intermediate reheating system, feed water reheating system, External heating system, etc.

Feedwater recuperation system is a system in which part of the steam is extracted from the intermediate stages of different pressures of the steam turbine to heat condensate water and feedwater. This part of heat recovery is done by steam extraction without loss of cold source, which is one of the main measures to improve the thermal economy of thermal power plants. Modern thermal power plants usually use 7-8 (or even 9) regenerative heating systems.

Further, in order to ensure the continuous operation of the unit, a make-up water unit must be installed, but in general, the deoxidation process of the make-up water unit is completed under relatively high pressure, high temperature, and relatively large discharge heat and working fluid .

For example, since the formation of the power plant, the technology and management level of the power plant has been continuously improved, and the soda loss rate of the thermal system in the production process of the power plant has been reduced to 0.5-1.0%. At present, the biggest source of loss is the discharge of the working fluid from the oxygen exhaust door of the deaerator, but in order to ensure the oxygen content of the working fluid in the thermal cycle system, the oxygen exhaust door of the deaerator must be kept open. The purpose of reducing the oxygen content of the soda water working medium is to ensure that the mechanical equipment of the system is free from corrosion. Therefore, the make-up water must be strictly deoxidized, deionized and other chemical treatments, and can only be filled into the system for operation after passing the standard.

There are at least the following problems in the prior art: in the thermodynamic cycle system, the oxygen discharge door of the deaerator remains open, the loss rate of soda and water working medium is high, and there is a large waste of energy and working medium, which restricts the economic benefits of the power plant .

Utility model content

Embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art, and provide a thermal cycle system of a power plant.

An aspect of the embodiments of the present disclosure provides a thermal cycle system of a power plant. The system includes a thermal power generation subsystem, a thermal power terminal subsystem, a thermal power regeneration subsystem and a thermal power supply subsystem; the thermal power generation subsystem includes: a boiler and a steam turbine; the thermal power terminal subsystem includes : Condenser and air extractor; The thermal energy power recovery subsystem includes: Deaerator and oxygen exhaust door controller; The thermal energy power supply subsystem includes: Makeup water tank and heating device; The condenser's The condensed water outlet is connected with the feed water inlet of the deaerator through the first water pipeline, the exhaust outlet of the deaerator is provided with an oxygen discharge valve, and the water supply outlet of the deaerator is connected through the second water pipeline The road is connected with the feed water inlet of the boiler, the steam outlet of the boiler is connected with the steam inlet of the steam turbine, and the exhaust steam outlet of the steam turbine is connected with the steam inlet of the condenser;

The outlet of the make-up water tank communicates with the make-up water inlet of the condenser through a make-up pipeline, and the inlet of the air extractor communicates with the exhaust outlet of the condenser through a suction pipeline; the heating The device is used to heat the make-up water tank to heat the make-up water temperature to the saturation temperature under the working pressure of the condenser; the oxygen discharge door controller is electrically connected to the oxygen discharge door for When the oxygen content in the oxygen device is lower than a preset value, the oxygen discharge valve is controlled to be closed.

Optionally, the heating device includes a heat collector and a heat exchanger; the heat collector is connected to the heat exchanger; the heat collector is arranged outside the makeup water tank; the heat exchanger is arranged Inside the make-up water tank.

Optionally, the system further includes a temperature sensor and a temperature controller; the temperature sensor is arranged in the supply water tank or in the supply pipeline, and is electrically connected to the temperature controller; the temperature controller is used Based on the supply water temperature detected by the temperature sensor, the heating device is regulated to maintain the supply water temperature at the saturation temperature.

Optionally, the system further includes a water volume regulator; the water volume regulator is connected in series with the supply pipeline for adjusting the supply water volume delivered to the condenser.

Optionally, a spray head is provided in the condenser, and the spray head is provided with a plurality of spray holes, and the spray head is connected to the feed water inlet of the condenser through a connecting pipe.

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

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

In the thermal cycle system of the power plant in the embodiment of the present disclosure, the feed water input to the condenser is heated to its saturation temperature under the working pressure, which is conducive to the escape of oxygen. The oxygen content is reduced to close the oxygen discharge door when the oxygen content is lower than the preset value, reduce the heat and working medium discharge of the deaerator, and realize energy saving and emission reduction.

Description of drawings

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

In the picture:

100. Condenser; 110. First water pipeline; 120. First condensate pump;

130. Fine desalinated water tank; 140. Second condensate pump; 200. Air extractor; 210. Air extraction pipeline; 300. Deaerator; 310. Second water delivery pipeline; 320. Low-pressure heater; 330. High-pressure heating device; 340, feed water pump; 400, oxygen exhaust door; 500, boiler;

600, steam turbine; 700, water supply tank; 710, supply pipeline; 720, water supply pump;

730, water regulator; 800, heating device.

Detailed ways

In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in FIG. 1 , an embodiment of the present disclosure relates to a thermal cycle system of a power plant, the system includes: a thermal power generation subsystem, a thermal power terminal subsystem, a thermal power regeneration subsystem, and a thermal power supply subsystem; The thermal power generation subsystem includes: boiler 500 and steam turbine 600; the thermal power terminal subsystem includes: condenser 100 and air extractor 200; the thermal power regeneration subsystem includes: deaerator 300 and oxygen exhaust A door controller (not shown in the figure); the thermal power supply subsystem includes: a supply water tank 700 and a heating device 800 . The condensed water outlet of the condenser 100 communicates with the feed water inlet of the deaerator 300 through the first water delivery pipeline 110, and the exhaust outlet of the deaerator 300 is provided with an oxygen discharge valve 400. The feedwater outlet of the deaerator 300 communicates with the feedwater inlet of the boiler 500 through the second water pipeline 310, the steam outlet of the boiler 500 communicates with the steam inlet of the steam turbine 600, and the exhaust steam of the steam turbine 600 The outlet communicates with the steam inlet of the condenser 100 .

The outlet of the make-up water tank 700 communicates with the make-up water inlet of the condenser 100 through a make-up pipeline 710 , and the inlet of the air extractor 200 communicates with the exhaust outlet of the condenser 100 through a suction pipeline 210 The heating device 800 is used to heat the make-up water tank 700, so as to heat the make-up water temperature to the saturation temperature under the working pressure of the condenser 100; the oxygen discharge door controller is electrically connected to the oxygen discharge door 400 connected to control the closure of the oxygen discharge valve 400 when the oxygen content in the deaerator 300 is lower than a preset value.

As shown in FIG. 1 , the thermal power supply subsystem further includes: a supplementary water pump 720 , and the supplementary water pump 720 may be arranged in the supply pipeline 710 . The replenishment water in the replenishment water tank 700 is demineralized water, the replenishment water tank 700 may be a demineralized water tank for a power plant, and the demineralized water tank may be installed in a desalination room. The thermal power supply subsystem may further include: a water replenishment controller, the water replenishment controller is electrically connected to the water level gauge of the deaerator, and the water replenishment pump 720 is electrically connected to the water replenishment controller. When the feed water level in the deaerator 300 is lower than the preset threshold value, the feed water level signal is received by the feed water controller, and the feed water controller controls the feed water pump to remove salt and heat to the working pressure of the condenser Make-up water at a lower saturation temperature is sent to the condenser; the heating device 800 heats the make-up water to the saturation temperature under the working pressure of the condenser 100, and the gas dissolved in the make-up water in this physical state reaches The minimum, so as to ensure that the oxygen content of the supply water meets the target requirements.

The thermal power terminal subsystem further includes: a first condensate pump 120 , a fine desalinated water tank 130 and a second condensate pump 140 . The first condensate pump 120 , the fine desalinated water tank 130 and the second condensate pump 140 are sequentially arranged in the first water delivery pipeline 110 along the flow direction of the feed water. The first condensate pump 120 boosts the pressure of the condensate and make-up water in the hot well of the condenser 100 and sends them to the fine desalinated water tank 130, and the fine desalted water tank 130 further deoxidizes the make-up water Desalination is carried out, and the pressure is further boosted by the second condensed water pump 140 and then sent to the thermal power recovery sub-system. The thermal power terminal subsystem also includes: 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), etc., and the circulating water pipeline is set at the The condenser 100, the part of the circulating water pipeline protruding from the condenser 100 is provided with the circulating water pump, and both ends of the circulating water pipeline communicate with the cooling water tower. The specific connection relationship between the circulating water pump, the circulating water pipeline and the cooling water tower will not be described here.

As an example, as shown in FIG. 1 , the thermal power regeneration subsystem further includes: a low-pressure heater 320, a feed water pump 340, and a high-pressure heater 330; the low-pressure heater 320 is arranged on the first water delivery pipeline 110. The feed water pump 340 and the high pressure heater 330 are respectively arranged in the second water delivery pipeline 310 . The feed water pump is used to deliver the deaerator water with a certain temperature and deoxidized feed water to the boiler after increasing the pressure in the water storage tank of the deaerator, so as to meet the water demand of the boiler. The low-pressure heater and the high-pressure heater can respectively use part of steam extraction of the steam turbine to heat the boiler feed water, improve the thermal efficiency of the power plant, increase the temperature of the feed water, and then reduce the temperature of the feed water entering the boiler and the furnace, reducing the heat exchange loss due to temperature difference, saving fuel, and is conducive to the safe operation of the unit. As for the specific structures and control connections of the low-pressure heater, the feed water pump, and the high-pressure heater, the technologies are relatively mature, and will not be repeated here. The deaerator 300 is also provided with a water level gauge, the water level gauge is electrically connected to the thermal power supply subsystem, and the water level gauge is used to detect the feed water level in the deaerator 300, when the deaerator 300 feed water When the water level is lower than the preset threshold, the water level gauge sends a signal to the water supply controller of the thermal energy power supply subsystem, and the thermal energy power supply subsystem heats the supply water to the saturation temperature under the working pressure of the condenser before delivering to the condenser 100 for deoxygenation, and then to the deaerator 300. An oxygen measuring instrument is arranged in the deaerator 300 close to the feed water outlet, and the oxygen measuring instrument is electrically connected to the oxygen discharge door controller, and the oxygen measuring instrument is used to monitor the oxygen content of the feed water in the deaerator 300, When the oxygen content of the feed water in the deaerator 300 is lower than the preset value, that is, when the quality index of the oxygen content is lower than the standard, the oxygen exhaust valve 400 of the deaerator 300 is automatically closed to reduce the heat and heat of the thermal cycle system of the power plant. For working fluid discharge, the oxygen meter may be a dissolved oxygen sensor. The specific volume and model of the deaerator can be selected and used according to the actual situation, and the specific structure of the deaerator will not be described here.

The working principle of the thermodynamic cycle system of the power plant: the heating device can operate independently of the unit, the heating device 800 can heat the make-up water tank 700 in advance, and heat the make-up water temperature to the working pressure of the condenser 100 Saturation temperature, it is also possible to heat the supply water 2°-4° higher than the saturation temperature, adjust the heating supply water temperature according to the actual situation, and keep the supply water temperature at the saturation temperature; when the unit starts, the heated supply water transported to the condenser 100, because the make-up water temperature is the saturation temperature under the working pressure of the condenser 100, after the make-up water enters the condenser 100, the gas in the make-up water can easily escape, and the gas pumping The device 200 extracts the oxygen and other gases escaping from the condenser 100 to keep the condenser 100 in a vacuum state; the make-up water and condensed water after deoxygenation form the feed water of the boiler 500 and send it to the deoxidizer. Oxygenator 300, the oxygen meter in the deaerator 300 detects the oxygen content of the boiler 500 feed water, and sends the detection information to the oxygen exhaust door controller, when the boiler 500 feed water oxygen content When the value is lower than the preset value, the oxygen exhaust valve controller controls the oxygen exhaust valve 400 to close, otherwise, the oxygen exhaust valve 400 is opened; generally speaking, during the start-up stage of the unit, although the condenser 100 Deaeration, the oxygen content of the feed water entering the deaerator 300 may exceed the oxygen content preset value of the deaerator 300, at this time, the oxygen discharge valve 400 is opened, and the oxygen content is discharged from the deaerator 300 gas; after the normal operation of the unit, the heating device maintains the make-up water temperature at the saturation temperature under the working pressure of the condenser, where the heating device can automatically operate as required to continuously heat the make-up water in the make-up water tank , to ensure that when replenishment is required, replenishment water heated to the saturation temperature can be provided at any time; The meter sends a signal to the water replenishment controller, and the water replenishment controller sends the makeup water heated to the saturation temperature under the working pressure of the condenser 100 to the condenser 100, because the makeup water at the saturation temperature enters the After the condenser 100, the gas easily escapes and is extracted by the air extractor 200. Since the oxygen content of the condensed water in the condenser 100 is low, the oxygen content standard of the condensed water and the make-up water is guaranteed; The boiler 500 feed water that is deaerated by the condenser is input to the deaerator 300, which can basically ensure that the oxygen content of the feed water entering the deaerator 300 is lower than a preset value, and ensure that the oxygen exhaust valve 400 is closed. Generally, during the start-up stage of the unit, water treatment is mainly carried out. The feed water input to the deaerator 300 has been deaerated, and the oxygen content is low. The oxygen discharge door 400 can be opened a little, and the oxygen discharge The opening size of the door 400 can be adjusted according to the actual situation; as the unit is running, the condensed water from the steam turbine 600 in the condenser 100 increases, and the make-up water entering the condenser 100 is deaerated, so that it is input into the The oxygen content in the boiler 500 feed water of the deaerator 300 is reduced, and the oxygen exhaust valve 400 can basically be kept closed. After the oxygen exhaust valve is closed, the discharged soda and water and other working fluids are reduced, and the amount of replenished water or the frequency of replenishment will also decrease. If the oxygen is reduced, the oxygen brought in by the make-up water will also be reduced, and the condenser can fully meet the deaeration work, so that the oxygen content of the make-up water input to the deaerator is lower than the preset value, and the oxygen discharge valve is kept Closed, reducing the loss of soda water in the power plant, achieving the purpose of energy saving and emission reduction,

In the test stage and actual use, the embodiment of the present disclosure achieves the deoxidation of the working medium without heat and discharge of the working medium, which can not only ensure that the working medium meets the standard requirements, but also achieve the purpose of energy saving and emission reduction.

As an example, the oxygen discharge valve 400 of the deaerator 300 of the thermodynamic cycle system of a general thermal power generation unit is normally open to control the oxygen content of the working fluid in the thermal cycle system within the standard range. As a result, the steam-water loss here reaches more than 50% of the total steam-water loss in the thermal cycle system, or even more. Taking the 600MWe unit as an example, take the low value of 0.5% of the steam-water loss rate of the unit, that is, 9 tons/hour. After closing the oxygen exhaust valve, it is conservatively estimated that the steam-water loss rate can be reduced to at least 0.25%, that is, 4.5 tons/hour. It is 2.4 million kcal/hour, about 0.345 tons/hour of nuclear standard coal. After the oxygen exhaust valve is closed by using the embodiment of the present disclosure, the flow rate of the thermal cycle system is reduced under the same working conditions. If the equivalent utilization of the unit is 6000 hours per year, it is equivalent to about 2000 tons of standard coal per year; equivalent to 27000 tons of demineralized water tons/year. According to statistics, there are as many as 630 600MWe units in operation in China. This improvement alone can save 1.26 million tons of standard coal, 17 million tons of desalinated water, and 4.62 million tons of _CO2 emissions per year. Considering that there are still 137 1000WMe and 900 300WMe thermal power generating units in the country, the effect of energy saving and emission reduction will be even greater after the implementation of this improvement.

In the embodiment of the present disclosure, by improving the operation mode of the oxygen discharge door of the deaerator in the thermal cycle system of the thermal power plant and the improvement of the thermal cycle system, the oxygen discharge valve can be kept in a normally closed state, while ensuring that the oxygen content of the working medium reaches Quality index requirements, thereby reducing the loss of soda water in power plants, and contributing to national energy conservation and emission reduction.

Exemplarily, as shown in Figure 1, the heating device 800 includes a heat collector (not shown in the figure) and a heat exchanger (not shown in the figure); connection; the heat collector is arranged outside the make-up water tank 700; the heat exchanger is arranged inside the make-up water tank 700.

As an example, the thermodynamic cycle system can use solar photovoltaic/photothermal equipment to heat the make-up water in the make-up water tank 700, which saves energy, is easy to use, and complements the energy saving and emission reduction of the embodiments of the present disclosure.

Exemplarily, the system further includes a temperature sensor (not shown in the figure) and a temperature controller (not shown in the figure); the temperature sensor is arranged in the make-up water tank 700 or in the make-up pipeline 710, and It is electrically connected with the temperature controller; the temperature controller is used to regulate 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 can be electrically connected with the water supply controller, and the water supply controller can transmit the saturation temperature corresponding to the working pressure of the condenser 100 to the temperature controller, and the The temperature controller regulates the heating device 800 to maintain the make-up water temperature at the saturation temperature. Generally, the condenser is kept in vacuum, or the working pressure is extremely low, and the saturation temperature of the make-up water is only tens of degrees. Different condensers correspond to different saturation temperatures, which will not be described here. The embodiment of the present disclosure adopts the temperature sensor and the temperature controller to ensure the heating temperature of the make-up water and ensure the continuous and effective circulation of the thermal cycle system.

Exemplarily, as shown in FIG. 1 , the system further includes a water volume regulator 730; the water volume regulator 730 is connected in series with the supply pipeline 710 for adjusting the supply water volume delivered to the condenser 100 .

As an example, the water quantity regulator 730 may be electrically connected to the water supply controller, and the water quantity regulator 730 adjusts the supply water quantity delivered to the condenser 100 according to the supplementary water quantity obtained by the water supply controller. The water volume regulator 730 may be an ultrasonic flow meter, and the ultrasonic flow meter may be a Doppler ultrasonic flow meter. Ultrasonic flowmeter is suitable for flow measurement of pipelines, and can measure the flow of various liquids and sewage. It has a large measurement range and only needs to be clamped on the outer wall of the pipeline. It is very convenient to install. The flowmeter can further improve the accuracy of the data obtained by monitoring, and can improve the convenience of assembly. The water volume regulator 730 can also be a fluid metering pump, and the fluid metering pump can simultaneously complete the functions of transportation, metering and adjustment, thereby simplifying the production process. Those skilled in the art can select related devices as the water volume regulator according to the actual situation. The use of the water volume regulator can reduce the amount of water supply per unit time and prolong the water supply time, so that the gas can fully escape after the water supply enters the condenser, so that the water supply can meet the requirements of the thermal cycle system, that is, the water supply can be changed to Replenish water for an appropriate amount of time, and fully discharge the gas in the replenishment water. The specific water supply can be regulated according to the actual situation.

Exemplarily, the condenser 100 is provided with a shower head (not shown in the figure), and the shower head is provided with a plurality of spray holes, and the shower head is connected to the condensate through a connecting pipe. The feed water inlet of the condenser 100 is connected; the spray range of the spray head covers at least 1/2 of the cross-sectional area of the condenser 100; the number of spray holes ranges from 10 to 30.

As an example, the sprinkler spray covers above the condensation pipe in the condenser 100, and/or, the spray range of the sprinkler covers at least 1/2 of the cross-sectional area of the condenser 100, specifically The number of spray holes of the spray head can be set according to the type of the unit. Taking a 600MWe unit as an example, the spray head can be provided with at least 20 spray holes. The embodiment of the present disclosure increases the number of spray holes, increases the radial size of the spray head, and increases the spray range to ensure that the vacuum degree of the thermal cycle system meets the requirements of the technical specifications of the power plant.

On the other hand, the embodiments of the present disclosure provide a thermal cycle method of a power plant, using the above-mentioned thermal cycle system, the method includes: the heating device 800 heats the make-up water in the make-up water tank 700 to the condenser The saturation temperature under 100 working pressure; the makeup water heated to the saturation temperature is input to the condenser 100 through the makeup pipeline 710, and the air extractor 200 is connected to the condenser through the exhaust pipeline 210 100 to carry out pumping and deoxygenation.

The condenser 100 inputs the oxygen-depleted make-up water to the deaerator 300 through the first water pipeline 110; Water is input to the boiler 500, and the steam produced by the boiler 500 is input to the steam turbine 600 when the boiler 500 is running; the steam discharged from the steam turbine 600 enters the condenser 100 to be condensed into a water cycle to provide feed water for the boiler 500; wherein, The oxygen discharge valve controller is used for controlling the closure of the oxygen discharge valve 400 when the oxygen content in the deaerator 300 is lower than a preset value.

As an example, the make-up water is heated to the saturation temperature under the working pressure of the condenser 100 in the make-up water tank 700, and the make-up water entering the condenser 100 is pumped to remove oxygen through the air extractor 200, so that the make-up water The deoxidation of the water in the condenser 100 can ensure that the oxygen content of the feed water is low after being input into the deaerator 300, and the oxygen discharge valve 400 is kept closed during the normal operation of the unit. The oxygen discharge door can be controlled by an oxygen discharge door controller installed on the deaerator to realize automatic closing or opening, and the specific pumping time can be adjusted according to actual conditions. The embodiments of the present disclosure realize energy saving and emission reduction of coal-fired power plants by improving the equipment and operation method of the thermal cycle system of the power plant, and contribute to the country's 2030 carbon peak and 2060 carbon neutrality. Moreover, the structure of the thermal cycle system is simple, and the existing equipment can be fully utilized for appropriate improvement to realize the thermal cycle method of the embodiment of the present disclosure, reduce the steam and water discharge of the working fluid of the deaerator, and achieve energy saving and emission reduction.

Exemplarily, 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 the saturation temperature under the working pressure of the condenser 100, including: The sensor detects the make-up water temperature in the make-up water tank 700 or the make-up pipeline; the controller regulates the heating device 800 according to the received make-up water temperature to maintain the make-up water temperature at the saturation temperature.

As an example, the embodiments of the present disclosure can continuously heat the makeup water without manual operation, and automatically heat the makeup water to the saturation temperature, and the heating is timely and accurate, ensuring continuous operation of the unit.

Exemplarily, when the system further includes a water volume regulator 730 , the method further includes: adjusting the makeup water volume delivered to the condenser 100 through the water volume regulator 730 .

As an example, different from replenishing water at one time, the embodiments of the present disclosure can reduce the amount of replenishing water per unit time and extend the replenishing water time to facilitate the escape of gas in the replenishing water, ensure that the condenser is fully deoxygenated, and reduce the The oxygen content of the make-up water. The specific reduction of the water supply amount per unit time can be set according to the actual situation, and will not be repeated here. By adopting the thermodynamic cycle method of the embodiment of the present disclosure, it is possible to effectively reduce the steam and water discharge of the working fluid of the deaerator, and realize energy saving and emission reduction. Contribute to national energy conservation and emission reduction.

It can be understood that, the above embodiments are only exemplary embodiments adopted to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present utility model, and these variations and improvements are also regarded as the protection scope of the present utility model.

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.

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