A TCA water recovery system with a high-efficiency clarification and coagulation device and a control method

Abstract

A TCA water recovery system with an efficient clarification and coagulation device and a control method, comprising a TCA cooler, the top of the TCA cooler is connected to the high-temperature and high-pressure air output end of the gas turbine compressor chamber outlet, the cooling air after heat exchange in the TCA cooler is connected to the gas turbine rotor center hole of the gas turbine combustion chamber through a filter; the water inlet of the TCA cooler is connected to the high-pressure water pump, and the return water outlet of the TCA cooler is provided with three branches, the first branch is connected to the boiler high-pressure economizer, the second branch is connected to the pressure vessel M through a temperature reduction and pressure reduction device P, and the third branch is connected to the condenser. The present invention can effectively realize the characteristics of smooth switching of variable working conditions, convenient dosing, multi-stage clarification and separation, online water quality monitoring, automatic sewage discharge, and automatic recovery of qualified water quality.

Description

Technical Field

[0001] The invention relates to the technical field of gas-steam combined cycle power plant units, and in particular to a TCA feed water recovery system with a high-efficiency clarification and coagulation device and a control method. Background Art

[0002] Taking the typical Dongfang Electric / Mitsubishi MF701F5 gas turbine as an example, TCA (gas turbine cooling air cooler) is an auxiliary equipment that must be configured for the gas turbine, which is equivalent to a water-air heat exchanger. Its function is to use low-temperature high-pressure feed water to cool part of the high-temperature and high-pressure air extracted from the gas turbine compressor chamber. The high-temperature and high-pressure air after cooling and filtration enters the center hole of the gas turbine turbine rotor to cool the turbine rotor and moving blades.

[0003] The low-temperature, high-pressure feed water at the cold end of the TCA comes from the boiler's high-pressure feed water pump. After being heated in the TCA, this part of the water normally returns to the boiler's high-pressure economizer and eventually enters the steam drum. During the start-up and shutdown phases of the gas turbine, the feed water from the TCA does not have the conditions to enter the boiler-side economizer, and conventional designs can only enter the condenser.

[0004] In the early stage of gas turbine commissioning, the high-pressure feed water at the TCA outlet is dirty and cannot directly enter the boiler economizer. Therefore, this part of water can only enter the condenser at this stage. This has two consequences. First, it pollutes the entire condensate system and deteriorates the water quality. Second, too many impurities accumulate and eventually enter the condensate pump inlet filter, affecting the normal operation of the condensate pump.

[0005] During a gas turbine failure or shutdown, the feed water at the TCA outlet of the conventional design is delivered to the condenser through a flow control regulating valve. Since there is a negative pressure in the condenser (indicated by p1), and the feed water is high-temperature and high-pressure feed water (indicated by p2), p2 is much greater than p1, and the differential pressure before and after the flow control regulating valve is high, the switching process often causes pipeline oscillation, loosening of supports and hangers, or even falling off, accompanied by large fluctuations in the feedback of the flow control regulating valve. Summary of the invention

[0006] In order to overcome the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a TCA water recovery system and control method with a high-efficiency clarification and coagulation device, which can effectively realize the characteristics of smooth switching of variable operating conditions, convenient dosing, multi-stage clarification and separation, online monitoring of water quality, automatic sewage discharge and automatic recovery of qualified water quality.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A TCA water recovery system with a high-efficiency clarification and coagulation device comprises a TCA cooler 1, the top of the TCA cooler 1 is connected to the high-temperature and high-pressure air output end of the gas turbine compressor chamber outlet, and the cooling air after heat exchange in the TCA cooler 1 is connected to the center hole of the gas turbine rotor in the gas turbine combustion chamber through a filter screen 2;

[0009] The water inlet end of the TCA cooler 1 is connected to the high-pressure feed water pump 3, and the return water outlet of the TCA cooler 1 is provided with three branches, the first branch is connected to the boiler high-pressure economizer 4, the second branch is connected to the pressure vessel M6 through the temperature reduction and pressure reduction device P5, and the third branch is connected to the condenser 10.

[0010] The air outlet of the TCA cooler 1 is provided with a bypass regulating valve A7 for controlling the temperature.

[0011] The output end of the pressure vessel M6 is connected to the online water quality monitoring device N8. Water that meets the requirements enters the condenser 10 through the control valve G9, and water that does not meet the requirements flows back to the pressure vessel M6 through the reflux valve H11. A sludge and sewage discharge valve I12 is provided at the bottom of the pressure vessel M6.

[0012] A control valve B13 and a control valve C14 are arranged in parallel between the water inlet end of the TCA cooler 1 and the high-pressure water pump 3 .

[0013] A flow control valve D15 is provided between the TCA cooler 1 and the temperature and pressure reduction device P5.

[0014] The temperature reduction and pressure reduction device P5 is internally provided with 5 layers of annular tubes, each layer of which has a certain number of throttling holes, and each layer of annular tubes has connecting pipes, which operate in series. High-pressure water supply enters from the upper layer, and the pressure decreases step by step along each layer. A cylindrical grid is arranged in the middle of the temperature reduction and pressure reduction device P5, and a layer of filter screen is wrapped around the outside of the grid, which plays a role of fixing and supporting. A nozzle is arranged at the top of the temperature reduction and pressure reduction device P5, and the top of the grid is below the nozzle position. The low-temperature water supply from the middle tap of the water supply pump is directly sprayed into the inside of the grid through the nozzle to reduce the water supply after pressure reduction.

[0015] A dosing reserved interface is provided between the temperature reduction and pressure reduction device P5 and the pressure vessel M6, and the dosing reserved interface is used for adding coagulant and coagulant aid.

[0016] The pressure vessel M6 is provided with a coagulation zone, a plug flow zone, an inclined plate settling zone and a high molecular weight fine filtration zone in sequence. The inclined plate settling zone is provided with an inclined plate, and the high molecular weight fine filtration zone is filled with high molecular weight small balls.

[0017] The output end of the water supply side of the pressure vessel M6 is divided into three parallel routes, one route enters the boiler high-pressure economizer 4 through the flow control valve F17, another route directly enters the condenser 10 through the flow control valve E18, and the last route is connected to the temperature reduction and pressure reduction device P5 through the flow control valve D15, and enters the pressure vessel M6 after being output in the temperature reduction and pressure reduction device P5. The feed water is purified and separated in the pressure vessel M6, and finally the qualified feed water enters the condenser 10 through the control valve G9, and the unqualified feed water flows back to the pressure vessel M6 through the reflux valve H11.

[0018] The desuperheated water of the pressure vessel M6 comes from the low-temperature water supply from the middle tap of the water supply pump, and a desuperheated water regulating valve J16 is provided on the pipeline.

[0019] A flow control valve E18 is provided between the return water of the TCA device 1 and the condenser 10 .

[0020] A control method for a TCA water recovery system with a high-efficiency clarification and coagulation device comprises the following steps;

[0021] Control of the air side of TCA unit 1:

[0022] The control of the air side is mainly carried out after the single gas turbine is started. The corresponding pipe diameter is configured according to the cooling air flow required by the system. The main control method is to adjust the opening of the bypass regulating valve A7 entering the TCA device 1. The opening of the bypass regulating valve A7 is used to control the mixed temperature T at the outlet of the air side of the TCA device 1. f , regulating valve A7 automatically tracks the temperature T of the mixture after the outlet of TCA device 1 f , when T f >T0 (T0 is the design value of TCA air side outlet temperature), the bypass regulating valve A7 is closed, otherwise it is opened, and the whole process is closed-loop control;

[0023] TCA device 1 water inlet side control:

[0024] High-pressure feed water enters TCA device 1 through two parallel cooling water control valves B13 and C14. The opening of cooling water control valve B13 and C14 of TCA device 1 is controlled according to the set value of the gas turbine control system. Under normal circumstances, only one of control valves B13 and C14 is kept open and the other is closed to achieve redundant configuration;

[0025] TCA device 1 outlet side control

[0026] 1) Water outlet side to pressure vessel M6 circuit: At the initial stage of gas turbine startup, when the feed water quality does not meet the requirements or the feed water temperature does not meet the requirements for entering the boiler drum, the cooling water will enter the pressure vessel M6 first through the cooling water flow control valve D15, and complete water quality treatment, purification, sewage discharge and online monitoring in the pressure vessel M6;

[0027] The specific control methods are as follows:

[0028] a) If the online water quality monitoring is qualified, the control valve G9 from the pressure vessel M6 to the condenser 10 will be automatically opened, and the reflux valve H11 of the pressure vessel M6 will be interlocked and closed after the control valve G9 is fully opened;

[0029] b) If the online water quality monitoring fails, the reflux valve H11 of the pressure vessel M6 will be automatically opened. After the reflux valve H11 is fully opened, the control valve G9 from the pressure vessel M6 to the condenser will be interlocked and closed;

[0030] c) Automatic sewage valve I12: The mud discharge door at the bottom of the pressure vessel M6 is opened for 5 minutes every 8 hours to discharge mud and sewage, and finally discharged to the relevant water treatment equipment in the plant area;

[0031] d) The size and number of the throttling orifice plates of the temperature reduction and pressure reduction device P5 are designed according to the outlet pressure p1 of the water supply pump and the design pressure p2 of the pressure vessel M6, and the water supply pressure is finally throttled to the set value p2; the temperature reduction water of the pressure vessel M6 comes from the low-temperature water supply of the middle tap of the water supply pump, and a temperature reduction water regulating valve J16 is provided on the pipeline. The temperature reduction water regulating valve J16 automatically tracks the outlet water temperature T2 in the pressure vessel M6. When the temperature T2 is higher than the design outlet water temperature T2 of the pressure vessel M6, the temperature of the pressure vessel M6 is reduced. m , then the cooling water regulating valve J16 opens wide, otherwise it closes small, and the whole circuit realizes closed-loop regulation;

[0032] 2) Water outlet side to condenser 10 loop: When the gas turbine is shut down normally or undergoes fault maintenance, the high-pressure feed water quality meets the requirements. At this time, it is only necessary to switch the feed water loop directly to the condenser 10, that is, automatically open the flow control valve E18 from the TCA unit 1 to the condenser 10, and at the same time, interlock and close the flow control valve F17 from the TCA unit 1 to the high-pressure economizer 4;

[0033] 3) Flow control valve F17 from the outlet side to the high-pressure economizer outlet: When the load reaches more than 40% after the engine is started, the temperature on the air side of the TCA unit 1 under this load reaches the requirement for heating the high-pressure feed water. At this time, the flow control valve E18 from the TCA unit 1 to the condenser 10 is gradually closed, and the flow control valve F17 from the TCA unit 1 to the high-pressure economizer 4 is opened in an interlocking manner. The flow control valve F17 is controlled according to the set value of the engine control system.

[0034] Beneficial effects of the present invention:

[0035] 1) Convenient and feasible reserved interface for adding drugs: a reserved interface for adding coagulant and coagulant aid is designed in the container inlet area;

[0036] 2) Multi-stage efficient drug reaction zone: can realize the accelerated reaction and sedimentation of particles, colloids and suspended matter in sewage with drugs;

[0037] 3) Separation of clean water and sludge: The sludge produced after the reaction can be separated from the clean water;

[0038] 4) Online monitoring of outlet water quality: The outlet side is equipped with an online water quality detection turbidity meter, sodium meter, silica meter and pH value, which can be updated in real time.

[0039] 5) Automatic sewage discharge: The mud discharge door at the bottom of the container is opened for 5 minutes every 8 hours to discharge mud, and the sewage is discharged to the relevant water treatment equipment in the factory.

[0040] 6) Qualified water recovery: The water that meets the standards after testing is transported to the condenser through the pump. The water that does not meet the standards re-enters the reaction zone through the reflux valve.

[0041] 7) A temperature and pressure reduction device M is installed on the TCA return water loop to adjust the temperature and pressure of the high-pressure feed water to the parameters p2 and T required by the pressure vessel M. m .

[0042] 8) Automatic switching can be achieved between the flow control regulating valve F on the TCA return water side circuit and the return water regulating valve E to the condenser.

[0043] 9) The flow control valves D / E / F involved in the system can realize online monitoring of the flow during the switching process. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0045] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0046] like Figure 1 As shown: TCA air side: a certain amount of high-temperature and high-pressure air (p, t) is extracted from the outlet of the gas turbine compressor chamber and enters the TCA cooler 1, where it exchanges heat with low-temperature and high-pressure feed water. The air after heat exchange first passes through the filter 2 and finally enters the center hole of the gas turbine turbine rotor in the gas turbine combustion chamber to cool the turbine rotor and moving blades.

[0047] TCA water side: The outlet feed water from the high-pressure feed water pump 3 enters the TCA cooler 1 through the parallel feed water control valve B13 and the control valve C14, and cools the high-temperature and high-pressure air in the TCA cooler 1. After heat exchange, the high-pressure feed water has three routes. One route enters the outlet of the boiler high-pressure economizer 4 and finally enters the boiler high-pressure drum; the other route enters the condenser 10 that is evacuated through the flow control valve E18. The third route goes to the parallel loop of the condenser 10. The parallel loop first enters a temperature reduction and pressure reduction device P5 through the flow control valve D15. The temperature reduction and pressure reduction device P5 is designed with a multi-stage orifice plate and a filter screen, which can effectively realize the gradual reduction of the high-pressure feed water pressure. At the same time, a nozzle is designed in the temperature reduction and pressure reduction device P5. The nozzle water source comes from the middle tap of the high-pressure feed water pump, which can achieve a cooling effect. The feed water after temperature reduction and pressure reduction enters the pressure vessel M6, and the pressure vessel M6 can realize efficient clarification / coagulation / drainage of sewage and final clean water recovery.

[0048] Pressure vessel M6: Before the feed water after temperature reduction and pressure reduction enters the pressure vessel M6, coagulant and coagulant aid are added through the reserved interface for dosing and enter the pressure vessel M6. The pressure vessel M6 is internally provided with a coagulation zone, a plug flow zone, an inclined plate sedimentation zone and a high molecular particle size fine filtration zone. The coagulation zone can realize the reaction between the particles / colloids and suspended matter in the sewage and the added drugs; the plug flow zone further accelerates and promotes the reaction between the drugs and the above impurities; the inclined plate sedimentation zone realizes the separation of clean water and sludge; the high molecular particle size fine filtration zone further filters the clean water after the reaction to improve the water quality. The feed water after multi-stage purification is tested by the online water quality monitoring device N8 at the outlet of the pressure vessel M6. The water quality that meets the requirements enters the condenser 10 through the control valve G9, and the water quality that does not meet the requirements flows back to the pressure vessel M6 through the reflux valve H11. The treated sewage and impurities are finally discharged to the corresponding water treatment device in the plant for treatment.

[0049] The air outlet of the TCA cooler 1 is provided with a bypass regulating valve A7 for controlling the temperature.

[0050] The output end of the pressure vessel M6 is connected to the online water quality monitoring device N8. Water that meets the requirements enters the condenser 10 through the control valve G9, and water that does not meet the requirements flows back to the pressure vessel M6 through the reflux valve H11. A sludge and sewage discharge valve I12 is provided at the bottom of the pressure vessel M6.

[0051] A control valve B13 and a control valve C14 are arranged in parallel between the water inlet end of the TCA cooler 1 and the high-pressure water pump 3 .

[0052] A flow control valve D15 is provided between the TCA cooler 1 and the temperature and pressure reduction device P5.

[0053] The temperature reduction and pressure reduction device P5 is internally provided with 5 layers of annular tubes, each layer of which has a certain number of throttling holes, and each layer of annular tubes has connecting pipes, which operate in series. High-pressure water supply enters from the upper layer, and the pressure decreases step by step along each layer. A cylindrical grid is arranged in the middle of the temperature reduction and pressure reduction device P5, and a layer of filter screen is wrapped around the outside of the grid, which plays a role of fixing and supporting. A nozzle is arranged at the top of the temperature reduction and pressure reduction device P5, and the top of the grid is below the nozzle position. The low-temperature water supply from the middle tap of the water supply pump is directly sprayed into the inside of the grid through the nozzle to reduce the water supply after pressure reduction, and finally achieve the effect of temperature reduction and pressure reduction. The device can realize multi-stage reduction, spray cooling, and efficient filtration of high-pressure and high-temperature water supply, and finally enter the pressure vessel M6 after reaching the set parameters.

[0054] A dosing reserved interface is provided between the temperature reduction and pressure reduction device P5 and the pressure vessel M6, and the dosing reserved interface is used for adding coagulant and coagulant aid.

[0055] The pressure vessel M6 is provided with a coagulation zone, a plug flow zone, an inclined plate settling zone and a high molecular weight fine filtration zone in sequence. The inclined plate settling zone is provided with an inclined plate, and the high molecular weight fine filtration zone is filled with high molecular weight small balls.

[0056] A certain amount of coagulant is added to the internal coagulation area of ​​the pressure vessel M6 to mix the sewage and the coagulant in this area; after the water passes through the coagulation area, a plug flow area is set to make the mixed water in this area rise slowly, so that the pollutants and the clean water are gradually separated; after the water passes through the plug flow area, an inclined plate sedimentation area is set to further separate the pollutants from the clean water through the built-in inclined plate; the pollutants in the plug flow area and the inclined plate sedimentation area are sent out from the mud discharge gate after sedimentation and further processed, and the clean water passing through the inclined plate sedimentation area enters the high molecular weight particle size fine filtration area, which is filled with high molecular weight particle size balls to further remove the residual pollutants in the clean water, so that the effluent finally meets the requirements.

[0057] The output end of the water supply side of the pressure vessel M6 is divided into three parallel routes, one route enters the boiler high-pressure economizer 4 through the flow control valve F17, another route directly enters the condenser 10 through the flow control valve E18, and the last route is connected to the temperature reduction and pressure reduction device P5 through the flow control valve D15, and enters the pressure vessel M6 after being output in the temperature reduction and pressure reduction device P5. The feed water is purified and separated in the pressure vessel M6, and finally the qualified feed water enters the condenser 10 through the control valve G9, and the unqualified feed water flows back to the pressure vessel M6 through the reflux valve H11.

[0058] Control Methods

[0059] Control of the air side of TCA unit 1:

[0060] The control of the air side is mainly carried out after the single gas turbine is started. The corresponding pipe diameter is configured according to the cooling air flow required by the system. The main control method is to adjust the opening of the bypass regulating valve A7 entering the TCA device 1. The opening of the bypass regulating valve A7 is used to control the mixed temperature T at the outlet of the air side of the TCA device 1. f , regulating valve A7 automatically tracks the temperature T of the mixture after the outlet of TCA device 1 f , when T f >T0 (T0 is the design value of TCA air side outlet temperature), the bypass regulating valve A7 is closed, otherwise it is opened, and the whole process is closed-loop control;

[0061] TCA device 1 water inlet side control:

[0062] High-pressure feed water enters TCA device 1 through two parallel cooling water control valves B13 and C14. The opening of cooling water control valve B13 and C14 of TCA device 1 is controlled according to the set value of the gas turbine control system. Under normal circumstances, only one of control valves B13 and C14 is kept open and the other is closed to achieve redundant configuration;

[0063] TCA device 1 outlet side control

[0064] 1) Water outlet side to pressure vessel M6 circuit: At the initial stage of gas turbine startup, when the feed water quality does not meet the requirements or the feed water temperature does not meet the requirements for entering the boiler drum, the cooling water will enter the pressure vessel M6 first through the cooling water flow control valve D15, and complete water quality treatment, purification, sewage discharge and online monitoring in the pressure vessel M6;

[0065] The specific control methods are as follows:

[0066] a) If the online water quality monitoring is qualified, the control valve G9 from the pressure vessel M6 to the condenser 10 will be automatically opened, and the reflux valve H11 of the pressure vessel M6 will be interlocked and closed after the control valve G9 is fully opened;

[0067] b) If the online water quality monitoring fails, the reflux valve H11 of the pressure vessel M6 will be automatically opened. After the reflux valve H11 is fully opened, the control valve G9 from the pressure vessel M6 to the condenser will be interlocked and closed;

[0068] c) Automatic sewage valve I12: The mud discharge door at the bottom of the pressure vessel M6 is opened for 5 minutes every 8 hours to discharge mud and sewage, and finally discharged to the relevant water treatment equipment in the plant area;

[0069] d) The size and number of the throttling orifice plates of the temperature reduction and pressure reduction device P5 are designed according to the outlet pressure p1 of the water supply pump and the design pressure p2 of the pressure vessel M6, and the water supply pressure is finally throttled to the set value p2; the temperature reduction water of the pressure vessel M6 comes from the low-temperature water supply of the middle tap of the water supply pump, and a temperature reduction water regulating valve J16 is provided on the pipeline. The temperature reduction water regulating valve J16 automatically tracks the outlet water temperature T2 in the pressure vessel M6. When the temperature T2 is higher than the design outlet water temperature T2 of the pressure vessel M6, the temperature of the pressure vessel M6 is reduced. m , then the cooling water regulating valve J16 opens wide, otherwise it closes small, and the whole circuit realizes closed-loop regulation;

[0070] 2) Water outlet side to condenser 10 loop: When the gas turbine is shut down normally or undergoes fault maintenance, the high-pressure feed water quality meets the requirements. At this time, it is only necessary to switch the feed water loop directly to the condenser 10, that is, automatically open the flow control valve E18 from the TCA unit 1 to the condenser 10, and at the same time, interlock and close the flow control valve F17 from the TCA unit 1 to the high-pressure economizer 4;

[0071] 3) Flow control valve F17 from the outlet side to the high-pressure economizer outlet: When the load reaches more than 40% after the engine is started, the temperature on the air side of the TCA unit 1 under this load reaches the requirement for heating the high-pressure feed water. At this time, the flow control valve E18 from the TCA unit 1 to the condenser 10 is gradually closed, and the flow control valve F17 from the TCA unit 1 to the high-pressure economizer 4 is opened in an interlocking manner. The flow control valve F17 is controlled according to the set value of the engine control system.

Claims

1. A TCA water recovery system with a high-efficiency clarification and coagulation device, characterized in that: It comprises a TCA cooler (1), the top of the TCA cooler (1) is connected to the high-temperature and high-pressure air output end of the gas turbine compressor chamber outlet, and the cooling air that has undergone heat exchange in the TCA cooler (1) is connected to the center hole of the gas turbine rotor in the gas turbine combustion chamber through a filter (2); The water inlet end of the TCA cooler (1) is connected to the high-pressure feed water pump (3), and the return water outlet of the TCA cooler (1) is provided with three branches, the first branch is connected to the boiler high-pressure economizer (4), the second branch is connected to the pressure vessel M (6) through the temperature reduction and pressure reduction device P (5), and the third branch is connected to the condenser (10); The TCA cooler (1) is provided with a bypass regulating valve A (7) at the air outlet for controlling the temperature; The output end of the pressure vessel M (6) is connected to an online water quality monitoring device N (8); water that meets the requirements enters the condenser (10) through a control valve G (9); water that does not meet the requirements flows back to the pressure vessel M (6) through a reflux valve H (11); a sludge and sewage discharge valve I (12) is provided at the bottom of the pressure vessel M (6); A control valve B (13) and a control valve C (14) are arranged in parallel between the water inlet end of the TCA cooler (1) and the high-pressure water supply pump (3); The temperature reduction and pressure reduction device P (5) is internally provided with 5 layers of annular pipes, each layer of annular pipes is provided with a certain number of throttling holes, and each layer of annular pipes is connected with a connecting pipeline, which operates in series, and high-pressure feed water enters from the upper layer, and the pressure decreases step by step along each layer. A cylindrical grid is arranged in the middle of the temperature reduction and pressure reduction device P (5), and a layer of filter screen is wrapped on the outside of the grid. A nozzle is arranged at the top of the temperature reduction and pressure reduction device P (5), and the top of the grid is below the nozzle. The low-temperature feed water from the middle tap of the water supply pump is directly sprayed into the inside of the grid through the nozzle to reduce the water supply after pressure reduction; A dosing interface is provided between the temperature reduction and pressure reduction device P (5) and the pressure vessel M (6), and the dosing interface is used to add a coagulant and a coagulant aid; The pressure vessel M (6) is provided with a coagulation zone, a plug flow zone, an inclined plate settling zone and a high molecular weight fine filtration zone in sequence, wherein the inclined plate settling zone is provided with an inclined plate, and the high molecular weight fine filtration zone is filled with high molecular weight small balls; The output end of the water supply side of the pressure vessel M (6) is divided into three parallel paths, one of which enters the boiler high-pressure economizer (4) through a flow control valve F (17), another directly enters the condenser (10) through a flow control valve E (18), and the last is connected to the temperature reduction and pressure reduction device P (5) through a flow control valve D (15). After being output from the temperature reduction and pressure reduction device P (5), the water supply enters the pressure vessel M (6). The water supply is purified and separated in the pressure vessel M (6). Finally, qualified water supply enters the condenser (10) through a control valve G (9), and unqualified water supply is returned to the pressure vessel M (6) through a reflux valve H (11); The desuperheated water of the pressure vessel M (6) comes from the low-temperature water supply from the middle tap of the water supply pump, and a desuperheated water regulating valve J (16) is provided on the pipeline; A flow control valve E (18) is provided between the return water of the TCA cooler (1) and the condenser (10); A flow control valve D (15) is provided between the TCA cooler (1) and the temperature and pressure reduction device P (5).

2. The control method of a TCA water recovery system with a high-efficiency clarification and coagulation device according to claim 1 is characterized in that: The steps include: TCA cooler (1) air side control: The air side control is mainly carried out after the gas turbine is started up. The corresponding pipe diameter is configured according to the cooling air flow rate required by the system. The main control method is to adjust the opening of the bypass regulating valve A (7) entering the TCA cooler (1). The opening of the bypass regulating valve A (7) is used to control the mixed temperature T at the air side outlet of the TCA cooler (1). f , the regulating valve A (7) automatically tracks the temperature T of the mixed mixture at the outlet of the TCA cooler (1) f , when T f >T0 (T0 is the design value of TCA air side outlet temperature), the bypass regulating valve A (7) is opened to a smaller degree, otherwise it is opened to a larger degree, and the whole process is closed-loop controlled; TCA cooler (1) water inlet side control: High-pressure feed water enters the TCA cooler (1) through two parallel cooling water control valves B (13) and C (14). The openings of the cooling water control valves B (13) and C (14) of the TCA cooler (1) are controlled according to the set values ​​of the gas turbine control system. Under normal circumstances, only one of the control valves B (13) and C (14) is kept open and the other is closed, thus realizing a redundant configuration. TCA cooler (1) outlet side control 1) Water outlet to pressure vessel M (6) circuit: At the initial stage of turbine startup, if the feed water quality does not meet the requirements or the feed water temperature does not meet the requirements for entering the boiler drum, the cooling water will enter the pressure vessel M (6) through the cooling water flow control valve D (15) first, and the water quality treatment, purification, sewage discharge and online monitoring will be completed in the pressure vessel M (6); The specific control methods are as follows: a) If the online water quality monitoring is qualified, the control valve G (9) from the pressure vessel M (6) to the condenser (10) is automatically opened, and after the control valve G (9) is fully opened, the reflux valve H (11) of the pressure vessel M (6) is interlocked and closed; b) If the online water quality monitoring fails, the reflux valve H (11) of the pressure vessel M (6) is automatically opened, and after the reflux valve H (11) is fully opened, the control valve G (9) from the pressure vessel M (6) to the condenser is interlocked and closed; c) Mud and sewage discharge valve I (12): The mud discharge valve at the bottom of the pressure vessel M (6) is opened for 5 minutes every 8 hours to discharge mud and sewage, and finally discharged to the relevant water treatment equipment in the plant; d) The size and number of the throttling orifice plates of the temperature reduction and pressure reduction device P (5) are designed according to the outlet pressure p1 of the water supply pump and the design pressure p2 of the pressure vessel M (6), and the water supply pressure is finally throttled to the set value p2; the temperature reduction water of the pressure vessel M (6) comes from the low-temperature water supply from the middle tap of the water supply pump, and a temperature reduction water regulating valve J (16) is provided on the pipeline. The temperature reduction water regulating valve J (16) automatically tracks the outlet water temperature T2 in the pressure vessel M (6). When the temperature T2 is higher than the design outlet water temperature T2 of the pressure vessel M (6), the temperature reduction water regulating valve J (16) is automatically adjusted. m , the cooling water regulating valve J (16) is opened wide, otherwise it is closed small, and the whole circuit realizes closed-loop regulation; 2) Water outlet side to condenser (10) loop: When the gas turbine is shut down normally or undergoes fault maintenance, the high-pressure feed water quality meets the requirements. In this case, it is only necessary to switch the feed water loop directly to the condenser (10), that is, automatically open the flow control valve E (18) from the TCA cooler (1) to the condenser (10), and simultaneously close the flow control valve F (17) from the TCA cooler (1) to the high-pressure economizer (4); 3) Flow control valve F (17) from the outlet side to the high-pressure economizer outlet: When the load reaches 40% or more after the engine is started, the temperature of the air side of the TCA cooler (1) under this load reaches the requirement for heating the high-pressure feed water. At this time, the flow control valve E (18) from the TCA cooler (1) to the condenser (10) is gradually closed, and the flow control valve F (17) from the TCA cooler (1) to the high-pressure economizer (4) is opened in a chain manner. The flow control valve F (17) is controlled according to the set value of the engine control system.

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