A combined cycle unit full-operation operation system and method based on electric energy storage drive

Abstract

The present invention discloses a combined cycle unit full-operation condition operation system and method based on electric energy storage drive, including a gas turbine, a compressor, a waste heat boiler, a gas turbine, an electrochemical energy storage module, and a compressor, wherein the electrochemical energy storage module provides power for the compressor; first, a battery is used to store valley electricity, and an electric drive heat pump is driven during peak operation, and the gas turbine intake air is heated or cooled according to the actual operating conditions of the combined cycle unit, so as to improve the operating efficiency of the combined cycle unit and enhance the peak capacity of the unit. Second, when the gas turbine is operated in winter, the high-temperature condensate of the back-pressure steam turbine is used in stages to establish a low-grade waste heat cycle, thereby improving the operating efficiency of the unit under partial load. The operating efficiency, stability and flexibility of the combined cycle unit are improved, especially when the output of new energy and load fluctuations are large, and the optimized operation of the unit is achieved through the assistance of the electric energy storage system.

Description

Technical Field

[0001] The present invention relates to the technical field of energy utilization, and in particular to a combined cycle unit full-operation condition operation system and method based on electric energy storage drive. Background Art

[0002] As the installed capacity of new energy sources increases gradually, how to smooth out the periodicity and volatility of new energy generation is one of the difficulties faced by the new power system. Combined cycle units are the ballast and stabilizer of the power system peak load regulation. Combined cycle units are an efficient and environmentally friendly power generation technology with strong peak load regulation capabilities, and have been widely used in the power industry.

[0003] In order to further enhance the unit's operating capacity and optimize the comprehensive energy utilization efficiency, the present invention relies on electric energy storage equipment and electric drive heat pump equipment to improve the operating efficiency of the gas turbine and its cogeneration unit under full load and partial load conditions, and enhance the unit's peak capacity. In actual operation, the unit often faces variable operating conditions, including uncertainty in the output of new energy, load fluctuations, etc., which pose challenges to the stable operation of the unit. Summary of the invention

[0004] The purpose of the present invention is to provide a combined cycle unit full-operation condition operation system and method based on electric energy storage drive. First, the off-peak electricity is stored in batteries, and the electric drive heat pump is driven during peak operation. According to the actual operating conditions of the combined cycle unit, the intake air of the gas turbine is heated or cooled, so as to improve the operating efficiency of the combined cycle unit and enhance the peak capacity of the unit. Second, when the gas turbine is operated in winter, the high-temperature condensate of the back-pressure steam turbine is used in stages to establish a low-grade waste heat cycle to improve the operating efficiency of the unit under partial load. The operating efficiency, stability and flexibility of the combined cycle unit are improved, especially when the output of new energy and the load fluctuations are large, and the optimized operation of the unit is achieved with the assistance of the electric energy storage system.

[0005] The technical solution of the present invention is as follows:

[0006] The combined cycle unit full-operation condition operation system based on electric energy storage drive includes a gas turbine, a compressor, a waste heat boiler, and a connecting pipeline. The system is characterized in that it includes a gas turbine, an electrochemical energy storage module, and a compressor, and the electrochemical energy storage module provides power for the compressor; the condensate outlet of the compressor is connected to a four-way reversing valve through a pipeline, and the outlet of the four-way reversing valve is connected to the liquid inlet of the intake heat exchanger. The air is connected to the intake heat exchanger and the rear intake heat exchanger through the pipeline in turn for heat exchange. The heat exchange air enters the gas turbine through the pipeline from the outlet of the rear intake heat exchanger. The flue gas of the gas turbine is connected to the waste heat boiler through the pipeline for heat exchange and then discharged through the chimney;

[0007] It also includes a back-pressure steam turbine, a condenser, a condensate pump, and a heat exchanger. The steam after work of the back-pressure steam turbine is connected to the condenser through a pipeline. The outlet of the condenser is connected to the condensate pump and the heat exchanger in sequence through a pipeline and then connected to the water inlet of the waste heat boiler to form a recycling pipeline.

[0008] A first valve is installed in the pipeline between the condensate pump and the heat exchanger, and both ends of the first valve are respectively connected to the water cooling heat exchange inlet and outlet of the rear air intake heat exchanger through pipelines;

[0009] The medium inlet and the medium outlet of the heat exchanger are respectively connected to the pipeline and connected to the inlet end of the four-way reversing valve after passing through the fourth valve and the fifth valve;

[0010] The medium inlet and the medium outlet of the heat exchanger are also connected to pipelines respectively and connected to the liquid outlet of the air intake heat exchanger after passing through the sixth valve and the seventh valve.

[0011] Both ends of the first valve are connected to parallel pipes respectively, and the parallel pipes are connected to the second valve and the third valve respectively, and then connected to the water cooling heat exchange inlet and outlet of the rear intake heat exchanger respectively.

[0012] During the valley electricity period, the electrochemical energy storage module is charged to realize valley electricity consumption.

[0013] A method for full-operation condition operation of a combined cycle unit based on electric energy storage drive, characterized in that: based on the full-operation condition operation system of the combined cycle unit based on electric energy storage drive, when operating in winter, the system closes the first valve, opens the second valve and the third valve, and puts the system into operation with a post-installed intake heat exchanger to realize the step-by-step utilization of waste heat of condensate after the condensate pump; at the same time, the fourth valve is opened, the fifth valve is closed, the sixth valve is closed, and the seventh valve is opened, and the interface of the four-way reversing valve connected to the compressor outlet is connected to the liquid inlet of the intake heat exchanger, and the compressor medium enters the intake heat exchanger through the four-way reversing valve, and then flows back to the heat exchanger through the seventh valve for heat exchange, and then flows back to the compressor through the fourth valve to form an air heating operation path; at the same time, the electrochemical power storage module is used to drive the compressor to operate, and the intake heat exchanger is used to heat the air, thereby improving the energy utilization rate of the unit.

[0014] A method for full-operation condition operation of a combined cycle unit based on electric energy storage drive, characterized in that: based on the full-operation condition operation system of the combined cycle unit based on electric energy storage drive, when operating in summer, the first valve is opened, the second valve and the third valve are closed, and the intake heat exchanger is placed after the shutdown system because the condensate temperature is low and no step utilization is required; at the same time, the system closes the fourth valve, opens the fifth valve, opens the sixth valve, and closes the seventh valve, and the interface of the four-way reversing valve connected to the compressor outlet is connected to the heat exchanger inlet, and the compressor medium passes through the four-way reversing valve and the fifth valve to enter the heat exchanger for heat exchange, and then passes through the sixth valve to enter the intake heat exchanger and the four-way reversing valve to flow back to the compressor, forming an air cooling operation path, and at the same time, the electrochemical power storage module is used to drive the compressor to operate, and the intake heat exchanger is used to reduce the air temperature, thereby improving the top peak capacity of the unit.

[0015] The combined cycle unit full-operation operation system based on electric energy storage drive and its operation method have many significant advantages, mainly including:

[0016] 1. Efficient use of energy:

[0017] The system charges during off-peak hours through electrochemical energy storage modules, thereby absorbing and storing low-priced off-peak electricity and improving the economic efficiency of energy utilization.

[0018] During winter operation, the waste heat of the condensate after the condensate pump is utilized in a cascade manner to heat the air through the rear air intake heat exchanger, thereby improving the energy utilization rate of the unit.

[0019] During summer operation, the system valves and reversing valves are adjusted and the air temperature is lowered using the intake heat exchanger, which improves the unit's peak capacity and enhances its operating efficiency and adaptability.

[0020] 2. Flexibility and adjustability:

[0021] The system design includes multiple valves and reversing valves, which can flexibly adjust the system's operating mode according to different seasons and working conditions, such as heating the air in winter and cooling the air in summer, to adapt to different operating environments.

[0022] The introduction of electrochemical energy storage modules enables the system to adjust energy storage and discharge strategies according to electricity price fluctuations in different time periods, improving the economy and flexibility of the system.

[0023] 3. Environmental protection and energy saving:

[0024] The flue gas generated by the gas turbine is heat exchanged through the waste heat boiler, which fully utilizes the waste heat resources, reduces energy waste, and at the same time lowers the temperature of the emissions, which is beneficial to environmental protection.

[0025] The system drives the compressor through an electrochemical energy storage module, reducing energy consumption and emissions under traditional mechanical drive methods, which is beneficial to energy conservation and emission reduction.

[0026] 4. System stability and reliability:

[0027] The system improves the stability and reliability of the system and reduces the failure rate through the design of recycling pipelines, such as the recycling system composed of back-pressure steam turbine, condenser, condensate pump, heat exchanger, etc.

[0028] The setting and flexible adjustment of various valves enable the system to respond quickly to different working conditions and maintain a stable operating state.

[0029] The present invention utilizes the waste heat of the unit condensate to heat the intake air of the gas turbine, which can realize the recovery of low-grade waste heat and improve the energy utilization rate of the unit under partial load. It can achieve multiple purposes such as valley power consumption, intake air cooling, intake air heating, and cascade recovery and utilization of unit waste heat, and can improve the operating efficiency of the gas turbine under full load and partial load operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is the winter operating condition diagram of the full-operating condition operation system of the combined cycle unit driven by electric energy storage according to the present invention.

[0031] Figure 2 This is the summer operating condition diagram of the full-operating condition operation system of the combined cycle unit driven by electric energy storage according to the present invention. DETAILED DESCRIPTION

[0032] See also Figure 1 , 2 ,

[0033] The full-operation operation system of the combined cycle unit driven by electric energy storage includes a gas turbine, a compressor, a waste heat boiler, connecting pipelines, a gas turbine, an electrochemical energy storage module, and a compressor. The electrochemical energy storage module provides power for the compressor. The condensate outlet of the compressor is connected to a four-way reversing valve through a pipeline, and the outlet of the four-way reversing valve is connected to the liquid inlet of the intake heat exchanger. The air is connected to the intake heat exchanger and the rear intake heat exchanger through the pipeline in turn for heat exchange. The heat exchange air enters the gas turbine through the pipeline from the outlet of the rear intake heat exchanger. The flue gas of the gas turbine is connected to the waste heat boiler through the pipeline for heat exchange and then discharged through the chimney.

[0034] It also includes a back-pressure steam turbine, a condenser, a condensate pump, and a heat exchanger. The steam after work of the back-pressure steam turbine is connected to the condenser through a pipeline. The outlet of the condenser is connected to the condensate pump and the heat exchanger in sequence through a pipeline and then connected to the water inlet of the waste heat boiler to form a recycling pipeline.

[0035] A first valve is installed in the pipeline between the condensate pump and the heat exchanger, and both ends of the first valve are respectively connected to the water cooling heat exchange inlet and outlet of the rear intake heat exchanger through pipelines;

[0036] The medium inlet and the medium outlet of the heat exchanger are respectively connected to the pipeline and connected to the inlet end of the four-way reversing valve after passing through the fourth valve and the fifth valve;

[0037] The medium inlet and the medium outlet of the heat exchanger are also connected to pipelines respectively and connected to the liquid outlet of the air intake heat exchanger after passing through the sixth valve and the seventh valve.

[0038] Both ends of the first valve are connected to parallel pipes respectively, and the parallel pipes are connected to the second valve and the third valve respectively, and then connected to the water-cooled heat exchange inlet and outlet of the rear intake heat exchanger respectively.

[0039] How to run:

[0040] The system configuration is different in winter and summer: in summer, the steam turbine involved in this system is a condensing steam turbine, the purpose of which is to increase the upper limit of power generation; in winter, the steam turbine in this system is converted into a back-pressure steam turbine by replacing the rotor, which increases the exhaust pressure and temperature to increase the condenser circulating water temperature to ensure heating for residents.

[0041] Specific system operation mode:

[0042] 1.1 During the valley electricity period, the electrochemical energy storage module is charged to realize valley electricity consumption;

[0043] 1.2 During the peak power period, the unit needs to run at the peak. At this time, the operating mode of this system is determined by the following conditions:

[0044] When operating in winter, the unit is in winter partial load condition, and the system operates as follows Figure 1 shown.

[0045] A method for operating a combined cycle unit under full-operation conditions based on electric energy storage drive, wherein the system closes a first valve, opens a second valve and a third valve, and operates a post-installed intake heat exchanger of the system to realize the step-by-step utilization of waste heat of condensate after a condensate pump; at the same time, the fourth valve is opened, the fifth valve is closed, the sixth valve is closed, and the seventh valve is opened; an interface of a four-way reversing valve connected to an outlet of a compressor is connected to a liquid inlet of an intake heat exchanger; a compressor medium enters the intake heat exchanger through the four-way reversing valve, and then flows back to the heat exchanger through the seventh valve for heat exchange, and then flows back to the compressor through the fourth valve to form an air heating operation path; at the same time, an electrochemical power storage module is used to drive the compressor to operate, and the intake heat exchanger is used to heat the air, thereby improving the energy utilization rate of the unit.

[0046] When operating in summer, the unit is in full load condition in summer, and the system operates as follows Figure 2 As shown,

[0047] A method for operating a combined cycle unit under full operating conditions based on electric energy storage drive, wherein the first valve is opened, the second valve and the third valve are closed, and since the condensate temperature is low and no step utilization is required, the system rear intake heat exchanger is shut down; at the same time, the system closes the fourth valve, opens the fifth valve, opens the sixth valve, and closes the seventh valve, and the interface of the four-way reversing valve connected to the compressor outlet is connected to the heat exchanger inlet, and the compressor medium passes through the four-way reversing valve and the fifth valve into the heat exchanger for heat exchange, and then passes through the sixth valve into the intake heat exchanger and the four-way reversing valve to flow back to the compressor, forming an air cooling operation path, and at the same time, the compressor is driven to operate by an electrochemical power storage module, and the air intake heat exchanger is used to reduce the air temperature, thereby improving the unit's peak capacity.

Claims

1. A method for operating a combined cycle unit under full operating conditions based on electric energy storage drive, characterized in that: The invention comprises a combined cycle unit full-operation condition operation system based on electric energy storage drive, wherein the combined cycle unit full-operation condition operation system based on electric energy storage drive comprises a gas turbine, a compressor, a waste heat boiler, and a connecting pipeline, and is characterized in that it comprises a gas turbine, an electrochemical energy storage module, and a compressor, wherein the electrochemical energy storage module provides power for the compressor; the condensing medium outlet of the compressor is connected to a four-way reversing valve through a pipeline, the outlet of the four-way reversing valve is connected to the liquid inlet of the intake heat exchanger, the air is connected to the intake heat exchanger and the rear intake heat exchanger through the pipeline in turn for heat exchange, the heat exchanged air enters the gas turbine through the pipeline from the outlet of the rear intake heat exchanger, the flue gas of the gas turbine is connected to the waste heat boiler through the pipeline for heat exchange, and then discharged through the chimney Out; also includes a back-pressure steam turbine, a condenser, a condensing pump, and a heat exchanger. The steam after the back-pressure steam turbine does work is connected to the condenser through a pipeline. The outlet of the condenser is connected to the condensing pump and the heat exchanger in sequence through a pipeline and then connected to the water inlet of the waste heat boiler to form a recycling pipeline; a first valve is installed in the pipeline between the condensing pump and the heat exchanger, and the two ends of the first valve are respectively connected to the water-cooled heat exchange inlet and outlet of the rear air intake heat exchanger through a pipeline; the medium inlet and the medium outlet of the heat exchanger are respectively connected to the pipeline and connected to the inlet end of the four-way reversing valve after passing through the fourth valve and the fifth valve; the medium inlet and the medium outlet of the heat exchanger are also respectively connected to the pipeline and connected to the liquid outlet of the air intake heat exchanger after passing through the sixth valve and the seventh valve; The full-operation method of the combined cycle unit driven by electric energy storage is as follows: when operating in winter, the system closes the first valve, opens the second valve and the third valve, and puts the system into operation with a post-installed intake heat exchanger to realize the step-by-step utilization of the waste heat of the condensate after the condensate pump; at the same time, the fourth valve is opened, the fifth valve is closed, the sixth valve is closed, and the seventh valve is opened, and the interface of the four-way reversing valve connected to the compressor outlet is connected to the liquid inlet of the intake heat exchanger, and the compressor medium enters the intake heat exchanger through the four-way reversing valve, and then flows back to the heat exchanger through the seventh valve for heat exchange, and then flows back to the compressor through the fourth valve to form an air heating operation path; at the same time, the electrochemical power storage module is used to drive the compressor to operate, and the intake heat exchanger is used to heat the air, thereby improving the energy utilization rate of the unit; When operating in summer, the air intake heat exchanger is used to reduce the air temperature and improve the peak capacity of the unit.

2. A method for full-operation operation of a combined cycle unit based on electric energy storage drive according to claim 1, characterized in that: Both ends of the first valve are connected to parallel pipes respectively, and the parallel pipes are connected to the second valve and the third valve respectively, and then connected to the water cooling heat exchange inlet and outlet of the rear intake heat exchanger respectively.

3. The method for full-operation operation of a combined cycle unit based on electric energy storage drive according to claim 1, characterized in that: During the valley electricity period, the electrochemical energy storage module is charged to realize valley electricity consumption.

4. The method for full-operation operation of a combined cycle unit based on electric energy storage drive according to claim 1, characterized in that: When operating in summer, open the first valve, close the second valve and the third valve. Since the condensate temperature is low and there is no need for cascade utilization, shut down the system's rear intake heat exchanger. At the same time, close the fourth valve, open the fifth valve, open the sixth valve, and close the seventh valve. The interface of the four-way reversing valve connected to the compressor outlet is connected to the heat exchanger inlet. The compressor medium passes through the four-way reversing valve and the fifth valve into the heat exchanger for heat exchange, and then passes through the sixth valve into the intake heat exchanger and the four-way reversing valve to flow back to the compressor, forming an air cooling operation path. At the same time, the electrochemical power storage module is used to drive the compressor to operate, and the intake heat exchanger is used to reduce the air temperature to improve the unit's peak capacity.

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