Energy storage-heat pump linkage system based on gas-steam combined cycle and operation method
By introducing energy storage-heat pump linkage technology into the gas-steam combined cycle power generation system, the problems of low energy utilization efficiency and low peak regulating depth during the peak regulating process of existing systems are solved, and efficient use of multi-energy flow across time and space and efficient absorption of new energy are achieved.
Patent Information
- Application Number
- CN202510407511.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-02
- Publication Date
- 2025-06-13
AI Technical Summary
The existing gas-steam combined cycle power generation system has low energy utilization efficiency, small peak regulating depth, and insufficient parameter adjustment and insufficient selection of heat source.
The energy storage-heat pump linkage system based on the combined gas-steam cycle is adopted. By storing high-pressure air and waste heat during the electrical trough period, the electric heat pump is used to recover waste heat and store it for heating or auxiliary power generation; during the peak period, the gas storage chamber reduces the work of the fuel engine by releasing high-pressure air in the gas storage chamber, and preheating natural gas and condensate water to assist power generation.
It realizes efficient use of wind-light-gas-storage multi-energy flow across time and space, improves the system's energy efficiency level and new energy consumption capacity, and enhances the peak-shaving depth and flexibility of the unit.
Smart Images
Figure CN120140027A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical fields of wind and solar power generation, gas-steam combined cycle, thermal power peak regulation and new energy power consumption, and in particular to an energy storage-heat pump linkage system and an operation method based on a gas-steam combined cycle. Background Art
[0002] Renewable energy generation such as solar and wind power has strong volatility and anti-peak characteristics, which brings huge challenges to the peak regulation of the power grid. Thermal power is transforming from basic power to peak-shaving power, and deep peak-shaving operation of thermal power units will become the norm in the next few years. The gas-steam combined cycle power generation system is clean and efficient, and is an important and promising form of power generation. Improving the deep peak-shaving capability of the gas-steam combined cycle power generation system while efficiently absorbing renewable energy generation such as wind and solar power is a key technology in the energy and power industry. At present, conventional technologies have the following problems: (1) The comprehensive energy utilization level of peak load regulation methods such as electric boilers and bypass main steam is low. In order to improve the heating capacity of the unit during the peak period, the comprehensive energy efficiency level of the unit will be further reduced.
[0003] (2) The existing gas-steam combined cycle power generation system has problems such as inflexible parameter adjustment and inflexible heat source selection. Conventional unit peak-shaving technology faces practical problems such as low energy utilization efficiency and small peak-shaving depth. Summary of the invention
[0004] In order to solve the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide an energy storage-heat pump linkage system and operation method based on a gas-steam combined cycle, the system includes a gas-steam combined cycle unit, an electric heat pump, a new energy generator, a power controller, a storage tank, a gas storage chamber, and various pipeline valves, etc.; during the low electricity period, high-pressure air is stored in the gas storage chamber to consume the work of the gas engine, and the unabsorbed electricity of the power grid is used to drive the electric heat pump to recover various waste heat of the system and store it for heating or auxiliary power generation, so as to achieve low irreversibility electric heating while fully absorbing wind and solar power; during the peak electricity stage, the high-pressure air in the gas storage chamber is released to the combustion chamber to reduce the consumption of the gas engine work, and the purpose of auxiliary power generation is achieved by preheating natural gas and condensate through heat storage. The present invention realizes the efficient utilization of wind-solar-gas-storage multi-energy flows across time and space, and the system energy efficiency level and new energy absorption capacity are significantly improved.
[0005] In order to achieve the above object, the present invention adopts the following technical solution: Energy storage - heat pump linkage system based on gas - steam combined cycle. The system includes an air pipeline, an air compressor 01, a control valve B 22, a combustion chamber 04, a gas turbine 02, a flue gas pipeline of a waste heat boiler 16, and an exhaust pipeline, which are connected in sequence; the outlet pipeline of the air compressor 01 is also connected in sequence to a control valve A 21, a gas storage chamber 03, a control valve C 23, and the combustion chamber 04; a natural gas pipeline is connected in sequence to the cold fluid side of a heat exchanger A 05 and the combustion chamber 04; the exhaust pipeline of a steam turbine unit 11 is connected in sequence to the shell side of a condenser 14, the cold fluid side of a heat exchanger B 15, the steam - water pipeline of the waste heat boiler 16, and the steam inlet pipeline of the steam turbine unit 11; a regenerative pipeline is connected in sequence to a control valve F 26, a cold tank 18, a control valve H 30, the cold fluid side of a condenser 09, a water pump B 29, a hot tank 07, a water pump A 28, a control valve E 25, and a heating pipeline; the regenerative pipeline is connected in sequence to a control valve F 26, the hot fluid side of a heat exchanger B 15, a control valve G 27, a control valve E 25, and a heating pipeline; the regenerative pipeline is connected in sequence to a control valve F 26, the hot fluid side of a heat exchanger A 05, a control valve D 24, a control valve E 25, and a heating pipeline; the outlet pipeline of a heat pump compressor 20 is connected in sequence to the hot fluid side of a condenser 09, a throttle valve 19, the cold fluid side of an evaporator 18, and the inlet of the heat pump compressor 20; the outlet pipeline of the hot fluid side of the evaporator 18 is connected in sequence to a water pump C 31, the tube side of the condenser 14, a control valve J 33, and the inlet of the hot fluid side of the evaporator 18; the pipeline between the tube side of the condenser 14 and the control valve J 33 is also connected in sequence to a control valve I 32, a cooling tower 17, and the outlet of the hot fluid side of the evaporator 18; the air compressor 01, the gas turbine 02, and a gas turbine generator 06 are connected by a mechanical shaft; the steam turbine unit 11 and a steam turbine generator 13 are connected by a mechanical shaft; the gas turbine generator 06, the steam turbine generator 13, and a new energy generator 10 are respectively connected to the three inlets of a power controller 12 through circuits, and the two outlets of the power controller 12 are respectively connected to the power grid and the heat pump compressor 20 through circuits.
[0006] The energy storage - heat pump linkage system based on gas - steam combined cycle operates in the following manner during low - electricity - consumption periods: Close control valves C 23, D 24, and G 27; adjust the opening degrees of control valves E 25 and F 26 and the flow rate of water pump A 28 according to the heat load; adjust the opening degrees of control valves A 21 and B 22 according to the load of gas turbine 02, thereby consuming part of the mechanical work of gas turbine 02 and storing the excess high - pressure air in gas storage chamber 03; adjust the power controller 12 according to the electricity load required by the power grid to preferentially consume the power generation of new - energy generator 10, and consume the excess power through heat - pump compressor 20; adjust the thermal parameters of throttle valve 19 according to the heating temperature and the temperature of the condensed water on the tube side of condenser 14; adjust water pump B 29 and control valve H 30 according to the power of heat - pump compressor 20 and the thermal parameters of throttle valve 19 to make the temperature of the hot water flowing into hot water tank 07 consistent with the heating temperature; adjust water pump C 31, control valve I 32, and control valve J 33 according to the power of heat - pump compressor 20 and the thermal parameters of throttle valve 19 to make the outlet temperature of the hot - fluid side of evaporator 18 meet the requirement of cooling the exhaust steam of steam turbine unit 11 by condenser 14.
[0007] The energy storage - heat pump linkage system based on gas - steam combined cycle operates in the following manner during high - electricity - consumption periods: Close control valve A 21, open and adjust control valve C 23 so that the high - pressure air in gas storage chamber 03 enters combustion chamber 04 to reduce the mechanical work consumed by air compressor 01; open and adjust water pump A 28 so that the flow rate of the hot water flowing out of hot water tank 07 does not exceed the rated value, open and adjust control valves D 24, E 25, F 26, and G 27, and under the premise of preferentially meeting the external heat load, pre - heat natural gas and the condensed water of steam turbine unit 11 to make the sum of the power generation of gas - turbine generator 06 and steam - turbine generator 13 the largest and ensure that the Celsius temperature at the outlet of the cold - fluid side of heat exchanger A 05 for replacing natural gas and the Celsius temperature of the condensed water entering the steam - water pipeline of waste - heat boiler 16 do not exceed 85% of the Celsius temperature of the fluid in hot water tank 07; adjust the power controller 12 according to the electricity load required by the power grid to preferentially consume the power generation of new - energy generator 10, and if there is still excess power, consume it through heat - pump compressor 20; when there is excess power that needs to be consumed through heat - pump compressor 20, the adjustment methods of throttle valve 19, water pump B 29, control valve H 30, water pump C 31, control valve I 32, and control valve J 33 are the same as those in low - electricity - consumption periods; when there is no excess power that needs to be consumed through heat - pump compressor 20, close throttle valve 19, water pump B 29, control valve H 30, water pump C 31, control valve I 32, and control valve J 33.
[0008] Compared with the prior art, the present invention has the following advantages: (1) The heat of the return water of the heat supply network is recovered by an electric heat pump to assist heating, realizing the orderly utilization of energy.
[0009] (2) By comprehensively adopting compressed air energy storage and thermal energy storage devices, energy is stored and utilized across time and space, improving the energy efficiency level of the system.
[0010] (3) Through the linkage between compressed air energy storage and thermal energy storage, the complementary and interchangeable flow of heat and electric energy is achieved, and then the operating flexibility of the unit in the heating season is improved.
[0011] (4) By reasonably matching the operation method and system configuration of the present invention, the consumption level of new energy power such as wind energy and solar energy in the heating season is improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic diagram of the energy storage - heat pump linkage system and operation method based on gas - steam combined cycle of the present invention. DETAILED DESCRIPTION OF THE INVENTION
[0013] The present invention will be further described in detail below with reference to the drawings and specific embodiments.
[0014] In order to achieve the efficient and flexible coupling of energy utilization technology across time and space, heat pump technology, wind and solar power generation technology and gas - steam combined cycle units, the energy storage - heat pump linkage system based on gas - steam combined cycle of the present invention is as Figure 1As shown in the figure, the system includes an air pipeline, an air compressor 01, a control valve B 22, a combustion chamber 04, a gas turbine 02, a flue gas pipeline of a waste heat boiler 16, and an exhaust pipeline, which are connected in sequence; the outlet pipeline of the air compressor 01 is also connected in sequence to a control valve A 21, a gas storage chamber 03, a control valve C 23, and the combustion chamber 04; the natural gas pipeline is connected in sequence to the cold fluid side of a heat exchanger A 05 and the combustion chamber 04; the exhaust pipeline of a steam turbine unit 11 is connected in sequence to the shell side of a condenser 14, the cold fluid side of a heat exchanger B 15, the steam-water pipeline of the waste heat boiler 16, and the steam inlet pipeline of the steam turbine unit 11; the regenerative pipeline is connected in sequence to a control valve F 26, a cold tank 18, a control valve H 30, the cold fluid side of a condenser 09, a water pump B 29, a hot tank 07, a water pump A 28, a control valve E 25, and a heat supply pipeline; the regenerative pipeline is connected in sequence to a control valve F 26, the hot fluid side of a heat exchanger B 15, a control valve G 27, a control valve E 25, and a heat supply pipeline; the regenerative pipeline is connected in sequence to a control valve F 26, the hot fluid side of a heat exchanger A 05, a control valve D 24, a control valve E 25, and a heat supply pipeline; the outlet pipeline of a heat pump compressor 20 is connected in sequence to the hot fluid side of a condenser 09, a throttle valve 19, the cold fluid side of an evaporator 18, and the inlet of the heat pump compressor 20; the outlet pipeline of the hot fluid side of the evaporator 18 is connected in sequence to a water pump C 31, the tube side of the condenser 14, a control valve J 33, and the inlet of the hot fluid side of the evaporator 18; the pipeline between the tube side of the condenser 14 and the control valve J 33 is also connected in sequence to a control valve I 32, a cooling tower 17, and the outlet of the hot fluid side of the evaporator 18; the air compressor 01, the gas turbine 02, and a gas turbine generator 06 are connected by a mechanical shaft; the steam turbine unit 11 and a steam turbine generator 13 are connected by a mechanical shaft; the gas turbine generator 06, the steam turbine generator 13, and a new energy generator 10 are respectively connected to the three inlets of a power controller 12 through circuits, and the two outlets of the power controller 12 are respectively connected to the power grid and the heat pump compressor 20 through circuits. Through the above system design, the cross-time and space conversion and storage of heat and electric energy flow in the system can be realized during the heating season, and heat storage and gas storage are used to replace electricity storage, thereby greatly improving the flexible operation range of the system and the comprehensive energy utilization efficiency.
[0015] In order to develop the energy storage - heat pump linkage system based on gas - steam combined cycle more scientifically and effectively, it operates in the following manner during the low - electricity - consumption period: Close control valves C 23, control valves D 24, and control valves G 27, so that the pipeline from the gas storage chamber 03 to the combustion chamber 04 is cut off, and at the same time, heat exchanger A 05 and heat exchanger B 15 do not work during the low - electricity - consumption period; Adjust the opening degrees of control valves E 25 and control valves F 26 and the flow rate of water pump A 28 according to the heat load, so that the hot water flow rate in the heating pipeline meets the heating demand; Adjust the opening degrees of control valves A 21 and control valves B 22 according to the load of the gas turbine 02, thereby consuming part of the mechanical work of the gas turbine 02 and storing the excess high - pressure air in the gas storage chamber 03, achieving the purpose of reducing the electrical output of the gas - turbine generator 06, and replacing electricity storage in the form of storing compressed air; Adjust the power controller 12 to preferentially consume the power generation of the new - energy generator 10 according to the electrical load required by the power grid, and the excess power is consumed by the heat - pump compressor 20 to achieve low - irreversibility electric heating; Adjust the thermal parameters of the throttle valve 19 according to the heating temperature and the temperature of the condensate water on the tube side of the condenser 14 to meet the evaporation and condensation temperatures of the electric heat pump; Adjust water pump B 29 and control valves H 30 according to the power of the heat - pump compressor 20 and the thermal parameters of the throttle valve 19 so that the hot water temperature flowing into the hot water tank 07 is consistent with the heating temperature; Adjust water pump C 31, control valves I 32, and control valves J 33 according to the power of the heat - pump compressor 20 and the thermal parameters of the throttle valve 19 so that the outlet temperature of the hot - fluid side of the evaporator 18 meets the requirements for cooling the exhaust steam of the steam turbine unit 11 by the condenser 14. Through the above operation mode, it is possible to replace electricity storage in the form of heat storage and gas storage, greatly reduce the system investment, and at the same time improve the flexible operation level of the system, thereby achieving the efficient consumption of a high proportion of new - energy electricity.
[0016] In order to develop the energy storage - heat pump linkage system based on gas - steam combined cycle more scientifically and effectively, it operates in the following manner during peak electricity periods: Close control valve A 21 to cut off the gas storage path, open and adjust control valve C 23 so that the high - pressure air in the gas storage chamber 03 enters the combustion chamber 04 to reduce the mechanical work consumed by the air compressor 01, thereby increasing the electrical output of the gas turbine generator 06; open and adjust water pump A 28 so that the hot water flow rate flowing out of the hot tank 07 does not exceed the rated value, open and adjust control valve D 24, control valve E 25, control valve F 26, and control valve G 27. On the premise of giving priority to meeting the external heat load, pre - heat the natural gas and the condensate of the steam turbine unit 11, so that the sum of the power generation of the gas turbine generator 06 and the steam turbine generator 13 is maximized and the Celsius temperature at the cold fluid side outlet of the natural gas leaving the heat exchanger A 05 and the Celsius temperature of the condensate entering the steam - water pipeline of the waste heat boiler 16 do not exceed 85% of the Celsius temperature of the fluid in the hot tank 07, thereby increasing the power generation output of the gas - steam combined cycle system; adjust the power controller 12 according to the electricity load required by the power grid to preferentially absorb the power generation of the new energy generator 10. If there is still excess power, it is absorbed by the heat pump compressor 20; when there is excess power that needs to be absorbed by the heat pump compressor 20, the adjustment methods of the throttle valve 19, water pump B 29, control valve H 30, water pump C 31, control valve I 32, and control valve J 33 are the same as those in off - peak electricity periods; when there is no excess power that needs to be absorbed by the heat pump compressor 20, close the throttle valve 19, water pump B 29, control valve H 30, water pump C 31, control valve I 32, and control valve J 33. At this time, the electric heat pump system does not work. Through the above operation method, on the premise of meeting the heat load during peak electricity periods, the overall electrical output of the system can be greatly increased, realizing the flexible and efficient operation of the system.
Claims
1. Energy storage-heat pump linkage system based on gas-steam combined cycle, characterized by: The invention comprises an air pipeline, an air compressor (01), a control valve B (22), a combustion chamber (04), a gas turbine (02), a flue gas pipeline of a waste heat boiler (16), and a smoke exhaust pipeline which are connected in sequence; the outlet pipeline of the air compressor (01) is also connected in sequence to the control valve A (21), the air storage chamber (03), the control valve C (23), and the combustion chamber (04); the natural gas pipeline is connected in sequence to the cold fluid side of the heat exchanger A (05) and the combustion chamber (04); the exhaust pipeline of the steam turbine unit (11) is connected in sequence to the shell side of the condenser (14) and the cold fluid side of the heat exchanger B (15). , the steam-water pipeline of the waste heat boiler (16), the steam inlet pipeline of the steam turbine unit (11); the heat return pipeline is connected in sequence to the control valve J (26), the cold tank (18), the control valve S (30), the cold fluid side of the condenser (09), the water pump B (29), the hot tank (07), the water pump A (28), the control valve E (25), and the heating pipeline; the heat return pipeline is connected in sequence to the control valve J (26), the hot fluid side of the heat exchanger B (15), the control valve G (27), the control valve E (25), and the heating pipeline; the heat return pipeline is connected in sequence to the control valve J (26), the heat exchanger B (15), the hot fluid side, the control valve G (27), the control valve E (25), and the heating pipeline. The hot fluid side of the device A (05), the control valve D (24), the control valve E (25), and the heating pipeline; the outlet pipeline of the heat pump compressor (20) is connected in sequence to the hot fluid side of the condenser (09), the throttle valve (19), the cold fluid side of the evaporator (18), and the inlet of the heat pump compressor (20); the outlet pipeline of the hot fluid side of the evaporator (18) is connected in sequence to the water pump C (31), the tube side of the condenser (14), the control valve D (33), and the inlet of the hot fluid side of the evaporator (18); the pipeline between the tube side of the condenser (14) and the control valve D (33) is also connected in sequence to the control valve The door (32), the cooling tower (17), and the hot fluid side outlet of the evaporator (18); the air compressor (01), the gas turbine (02), and the gas turbine generator (06) are connected through a mechanical shaft; the steam turbine unit (11) and the steam turbine generator (13) are connected through a mechanical shaft; the gas turbine generator (06), the steam turbine generator (13), and the new energy generator (10) are respectively connected to the three inlets A, B, and C of the power controller (12) through circuits, and the two outlets A and B of the power controller (12) are respectively connected to the power grid and the heat pump compressor (20) through circuits.
2. The operating method of the energy storage-heat pump linkage system based on the gas-steam combined cycle according to claim 1 is characterized in that: During the off-peak period, control valve C (23), control valve D (24), and control valve G (27) are closed; the openings of control valve E (25) and control valve F (26) and the flow rate of water pump A (28) are adjusted according to the heat load; the openings of control valve A (21) and control valve B (22) are adjusted according to the load of the gas turbine (02), thereby consuming part of the mechanical work of the gas turbine (02) and allowing excess high-pressure air to be stored in the air storage chamber (03); the power controller (12) is adjusted according to the power load required by the power grid to give priority to consuming the power generated by the new energy generator (10), and the excess power is passed through the heat pump compressor (20). The invention relates to a heat pump (07) and a heat pump (07) for cooling the hot water. The invention relates to a heat pump (07) for cooling the hot water. The invention relates to a heat pump (07) for cooling the hot water. The invention relates to a heat pump (07) for cooling the hot water. The invention relates to a heat pump (07) for cooling the hot water. The invention relates to a heat pump (07) for cooling the hot water. The invention relates to a heat pump (07) for cooling the hot water. The invention relates to a heat pump (07) for cooling the hot water. The invention relates to a heat pump (07) for cooling the hot water. The invention relates to a heat pump (07) for cooling the hot water. The invention relates to a heat pump (07) for cooling the hot water. The invention relates to a heat pump (07) for cooling the hot water. The invention relates to a heat pump (07) for cooling the hot water.
3. The operating method of the energy storage-heat pump linkage system based on the gas-steam combined cycle according to claim 1 is characterized in that: During the peak electricity period, the control valve A (21) is closed, and the control valve C (23) is opened and adjusted to allow the high-pressure air in the air storage chamber (03) to enter the combustion chamber (04) to reduce the mechanical work consumed by the air compressor (01); the water pump A (28) is opened and adjusted so that the hot water flow out of the hot tank (07) does not exceed the rated value, and the control valve D (24), control valve E (25), control valve F (26), and control valve G (27) are opened and adjusted to preheat the natural gas and the condensate of the steam turbine unit (11) on the premise of giving priority to meeting the external heat load, so that the sum of the power generation of the gas turbine generator (06) and the steam turbine generator (13) is maximized and the temperature of the outlet of the cold fluid side of the natural gas leaving the heat exchanger A (05) and the condensate entering the waste heat boiler (16) are met. The Celsius temperature of the water pipeline does not exceed 85% of the Celsius temperature of the fluid in the heat tank (07); the power controller (12) is adjusted according to the power load required by the power grid to give priority to absorbing the power generated by the new energy generator (10); if there is still excess power, it is absorbed by the heat pump compressor (20); when there is excess power that needs to be absorbed by the heat pump compressor (20), the throttle valve (19), water pump B (29), control valve Xin (30), water pump C (31), control valve Ren (32) and control valve Gui (33) are adjusted in the same way as during the off-peak period; when there is no excess power that needs to be absorbed by the heat pump compressor (20), the throttle valve (19), water pump B (29), control valve Xin (30), water pump C (31), control valve Ren (32) and control valve Gui (33) are closed.