Heat supply system suitable for cross-seasonal waste heat storage and deep peak regulation of air cooling and heating power unit and operation method

Abstract

The invention discloses a heat supply system suitable for cross-seasonal waste heat storage and deep peak regulation of an air cooling and heating power unit and an operation method, and belongs to the technical field of comprehensive energy utilization and heat supply, and the heat supply system comprises a cooling heat exchange subsystem used for cooling the air cooling and heating power unit and a boiler and supplying heat to each subsystem; the heat storage subsystem is used for storing waste heat of the power plant, heating a target needing to be heated through a hot water heat storage tank in the heating season and providing a low-temperature heat source for the heat pump subsystem through a buried pipe; the heat pump subsystem is used for absorbing the low-temperature heat source by using a compression heat pump when the generating capacity of the thermoelectric unit is excessive, upgrading and heating the absorbed heat through electric energy, and generating a heat source with higher temperature to be provided for the heat supply network heat supply subsystem; and the heat supply network heat supply subsystem is used for receiving a heat source output by the cooling heat exchange subsystem or a heat source output when the heat pump subsystem works in the heating season. All-time waste heat utilization, deep peak regulation capacity, multi-energy combined supply flexibility and higher energy utilization efficiency can be achieved.

Description

Technical Field

[0001] The present invention relates to a heating system and an operating method suitable for cross-seasonal storage and deep peak regulation of waste heat of an air-cooled thermal power unit, belonging to the technical field of comprehensive energy utilization and heating supply. Background Art

[0002] Waste heat recovery heating technology: This technology recycles low-grade energy emitted by industrial equipment, such as high-temperature flue gas from process equipment and primary cooling circulating water from coking plants in steel enterprises. During the recovery process, heat exchangers are installed in the flue to transfer heat from the flue gas to the circulating water. Alternatively, other heat exchange equipment is used to transfer heat from waste heat and wastewater to a usable medium, thereby converting low-grade thermal energy into usable heat.

[0003] Geothermal heat pump technology utilizes shallow geothermal resources on the Earth's surface for both heating and cooling. In winter, the heat pump unit draws heat from the ground to heat the building. In summer, it absorbs heat from indoor spaces and transfers it back to the ground, providing air conditioning and cooling. The operating principle is that a compressor applies work to the refrigerant, causing it to undergo a vapor-to-liquid conversion cycle to achieve heat transfer.

[0004] Hot water storage tank technology: As a container for storing hot water, it provides basic insulation and storage functions, equipped with a water inlet, outlet, and temperature monitoring device. It utilizes the high specific heat capacity of water to introduce heat transfer water into the tank to store heat. When needed, the hot water is released to provide heat energy to heat-consuming equipment, maintaining a constant water temperature and meeting short-term hot water needs.

[0005] Waste heat recovery is incomplete and inefficient: Most existing waste heat recovery technologies only target a single waste heat source and are unable to fully recover the various waste heat generated by air-cooled thermal power units, resulting in a large amount of waste heat waste.

[0006] Lack of cross-seasonal heat storage capability: Traditional heat storage technologies, whether hot water storage tanks or other heat storage methods, can generally only achieve short-term storage of heat in the current season. They are unable to effectively store heat from periods of excess waste heat such as summer for use in seasons with high heating demand such as winter, making it difficult to achieve cross-seasonal allocation and efficient utilization of heat.

[0007] Inadequate peak-shaving capacity: During peak and off-peak periods, heating power cannot be flexibly and quickly adjusted to meet fluctuating user demand, resulting in unstable heating quality. Furthermore, the existing system lacks a coordinated peak-shaving mechanism between its various components, hindering its overall efficiency and making deep peak-shaving difficult. The system is unable to adapt to fluctuations in heat sources and load variations, easily leading to insufficient energy supply or energy waste.

[0008] Low system integration: Existing technologies often operate independently of each other, including waste heat recovery, heat storage, and heat supply, resulting in a low level of integration. This lack of close integration between these links and poor information exchange prevents unified and efficient regulation of the entire system based on factors such as actual waste heat generation, heat load demand, and energy price fluctuations. This limits the overall efficiency of energy utilization and overall system performance. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a heating system and operation method suitable for cross-seasonal storage and deep peak regulation of waste heat of air-cooled thermal power units.

[0010] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions.

[0011] In a first aspect, the present invention discloses a heating system suitable for storing and utilizing waste heat from air-cooled thermal power units across seasons and for deep peak regulation, comprising: The cooling and heat exchange subsystem is used to cool the thermal power unit and boiler and supply heat to the thermal storage subsystem, heat pump subsystem, and heat network heating subsystem; The heat storage subsystem is used to store the waste heat from the air-cooling unit in the cooling and heat exchange subsystem, to heat the target in need of heating through the hot water storage tank during the heating season, and to provide a low-temperature heat source for the heat pump subsystem through the buried pipe; The heat pump subsystem is used to absorb the low-temperature heat source by using a compression heat pump when the thermal power unit generates excess power, and then use electrical energy to upgrade the absorbed heat to generate a higher temperature heat source to provide to the heating network heating subsystem; The heat supply subsystem of the heat network is used to receive the heat source output by the cooling and heat exchange subsystem or the heat source output by the heat pump subsystem during the heating season to provide heating to the target that needs heating.

[0012] Furthermore, the cooling and heat exchange subsystem includes: a gas turbine, a steam turbine, a boiler, a flue gas waste heat exchanger, a valve 1, a pump 1, a flow control valve 1, a flow control valve 2, an air cooling island, an air condenser, a valve 2, a pump 2 and a valve 3; The flue gas outlet of the gas turbine is connected to the boiler. After the flue gas releases heat in the boiler, it enters the flue gas waste heat exchanger for further heat release and cooling. The high-temperature and high-pressure steam outlet of the boiler is respectively connected to the steam turbine and pump six; the low-pressure steam outlet of the steam turbine after work is connected to flow control valve one and flow control valve two respectively through pump one, flow control valve one is connected to the first inlet of the air-cooled condenser, flow control valve two is connected to the inlet of the air-cooled island, the first outlet of the air-cooled condenser and the outlet of the air-cooled island are connected to the condensate discharge port, the second inlet of the air-cooled condenser is connected to valve three, the second outlet of the air-cooled condenser is connected to the water inlet of the flue gas waste heat exchanger through pump two and valve one in sequence, and the water outlet of the flue gas waste heat exchanger is connected to valve two; The heat storage subsystem includes: a hot water storage tank, valve four, pump three, valve five, valve six, pump four, buried pipe and valve seven; The high-temperature layer of the hot water thermal storage tank is connected to valve four and pump three respectively. Valve four is also connected to valve two. Pump three is connected to valve six and pump four respectively through valve five. Valve six is ​​connected to one end of the buried pipe. The low-temperature layer of the hot water thermal storage tank is connected to valve seven. The heat pump subsystem includes: valve eight, valve nine, compression heat pump, pump five, valve ten 26 and valve eleven; The other end of the buried pipe is connected to valve seven through valve eight and valve ten and to the first outlet of the compression heat pump through valve nine. The first inlet of the compression heat pump is connected to pump four. The second outlet of the compression heat pump is connected to pump five. The second inlet of the compression heat pump is connected to valve eleven. The heating network heating subsystem includes: valve 12, pump 6, extraction steam heat exchanger, valve 13, valve 14, valve 15, valve 16, pump 7, valve 17, valve 18 and pump 8; Valve 12 is connected to the first outlet of the extraction steam heat exchanger, and valve 12 is also connected to pump 1. The high-temperature and high-pressure steam outlet of the boiler is connected to the first inlet of the steam heat exchanger through pump 6. The second inlet of the steam heat exchanger is connected to valve 15, valve 16, valve 17 and valve 18 respectively through valve 13. Valve 15 is also connected to valve 2. Valve 17 is also connected to pump 5. Valve 18 is connected to the primary network return water through pump 8. The second outlet of the extraction steam heat exchanger is connected to valve 16 and pump 7 respectively through valve 14, and pump 7 is connected to the primary network water supply.

[0013] In a second aspect, the present invention further discloses an operating method of a heating system suitable for storing and utilizing waste heat from air-cooled thermal power units across seasons and performing deep peak load regulation based on the first aspect, comprising: During the non-heating season, when the thermal power unit is in operation, the cooling and heat exchange subsystem is used as the heat source, and the exhaust steam condensation heat at the turbine outlet and the waste heat from the boiler flue gas are used to heat the thermal storage subsystem. During the non-heating season, the thermal power unit is shut down and the heat stored in the hot water thermal storage tank is used to heat the inter-seasonal thermal soil. The cooling and heat exchange subsystem and the heat network heating subsystem are shut down. During the heating season, only the thermal power units are operating to extract steam and provide waste heat for heating. The cooling and heat exchange subsystem and the heating network heating subsystem are used as heat sources to heat the return water of the heating network. The heat pump subsystem and the heat storage subsystem are in a shutdown state.

[0014] Furthermore, in the non-heating season, the thermal power unit operates under the following conditions: the cooling heat exchange subsystem is used as the heat source, and the exhaust steam condensation heat at the turbine outlet and the waste heat of the boiler flue gas are used to supply heat to the thermal storage subsystem: Valve 1, flow control valve 1, flow control valve 2, valve 2, valve 3, valve 5, valve 6, valve 8, pump 1, and pump 2 are open; valve 4, valve 7, valve 9, valve 10, valve 11, valve 12, valve 13, valve 14, valve 15, valve 16, valve 17, valve 18, compression heat pump, pump 3, pump 4, pump 5, pump 6, pump 7, and pump 8 are closed; the cooling heat exchange subsystem and the buried pipe form a heat storage circulation system to recover the condensation heat of the exhaust steam at the turbine outlet and the waste heat of the boiler flue gas; the heat pump subsystem and the heat network heating subsystem are in a shutdown state; Driven by pump one, the steam at the turbine outlet is divided into two paths and enters the air-cooling island and the air-cooled condenser respectively through flow control valve one and flow control valve two. After releasing heat, it is condensed and discharged. The heat source water flows into the air-cooled condenser through valve three to absorb the condensation heat of the steam at the turbine outlet and its temperature rises. Then it flows into the flue gas waste heat exchanger through pump two and valve one, further absorbs the waste heat of the boiler flue gas, and then flows into the buried pipe through valve two, valve five, and valve six to heat the soil and store heat. The temperature of the heat source water decreases after flowing through the buried pipe, and then it flows back to valve three, forming a cycle to continuously recover the condensation heat of the exhaust steam at the turbine outlet and the waste heat of the boiler flue gas.

[0015] Furthermore, when the hot water flow at the outlet of valve two exceeds a preset upper limit, valves four, seven, and ten are opened, and the hot water at the outlet of valve two flows into the high-temperature layer of the hot water thermal storage tank through valve four for heat storage. At the same time, the cold water in the low-temperature layer of the hot water thermal storage tank flows back to valve three through valves seven and ten, forming a cycle.

[0016] Furthermore, when the hot water flow at the outlet of valve two is lower than the preset lower limit, pump three, valve seven, and valve ten are opened, and the hot water in the high-temperature layer of the hot water storage tank flows into the buried pipe through pump three, valve five, and valve six as compensation. At the same time, the cold water at the outlet of valve eight flows into the low-temperature layer of the hot water storage tank through valve ten and valve seven, forming a circulation.

[0017] Furthermore, in the non-heating season, the thermal power unit is shut down and the heat stored in the hot water thermal storage tank is used to heat the cross-seasonal thermal storage soil. The cooling and heat exchange subsystem and the heat network heating subsystem are shut down in the following operation mode: Valve 5, Valve 6, Valve 7, Valve 8, Valve 10, and Pump 3 are open; Valve 1, Flow Control Valve 1, Flow Control Valve 2, Valve 2, Valve 3, Valve 4, Valve 9, Valve 11, Valve 12, Valve 13, Valve 14, Valve 15, Valve 16, Valve 17, Valve 18, Compression Heat Pump, Pump 1, Pump 2, Pump 4, Pump 5, Pump 6, Pump 7, and Pump 8 are closed; the hot water thermal storage tank and the underground pipe form a heat storage circulation system, using the heat stored in the hot water thermal storage tank during the unit operation phase to continuously store heat in the underground pipe; The hot water in the high temperature layer of the hot water storage tank flows into the buried pipe through pump three, valve five, and valve six to heat the soil and store heat. After the temperature drops, it flows back to the low temperature layer of the hot water storage tank through valves eight, valve ten, and valve seven, forming a cycle.

[0018] Furthermore, in the heating season, only the thermal power units are operating to extract steam and provide waste heat for heating. The cooling and heat exchange subsystem and the heating network heating subsystem serve as heat sources to heat the return water of the heating network. The heat pump subsystem and the heat storage subsystem are in a shutdown state. The operating mode is as follows: Valve 1, flow control valve 1, flow control valve 2, valve 2, valve 3, valve 10, valve 13, valve 14, valve 15, pump 1, pump 2, pump 7, and pump 8 are open, and valve 4, valve 5, valve 6, valve 7, valve 8, valve 9, valve 11, valve 12, valve 16, valve 17, valve 18, pump 3, pump 4, pump 5, and pump 6 are closed; The return water from the primary network passes through pump eight, valve ten, and valve three in sequence to enter the air-cooled condenser to absorb heat and heat up, then passes through pump two and valve one to enter the flue gas waste heat exchanger to further absorb heat and heat up, then flows through valve two, valve fifteen, and valve thirteen to enter the extraction steam heat exchanger to further absorb heat and heat up, then flows through valve fourteen and pump seven as the primary network supply water to provide heating for users, forming a cycle.

[0019] Furthermore, in the heating season, when only the thermal power unit is operating to extract steam and supply waste heat for heating and the thermal power unit generates excess electricity, valve six, valve nine, valve eleven, valve seventeen, the compression heat pump, pump four, and pump five are opened, and the compression heat pump converts the excess electricity into heat; After the low-temperature heat source water in the buried pipe absorbs geothermal energy, it passes through valve six and pump four and enters the compression heat pump. After releasing heat as a low-temperature heat source, it flows back to the buried pipe through valve nine, forming a cycle. After the primary network return water passes through pump 8, a part of it is diverted and enters the compression heat pump through valve 11 to absorb heat and heat up, and then passes through pump 5 and valve 17 to merge with the hot water heated by waste heat, enters the extraction steam heat exchanger for further heating, and then serves as the primary network supply water to provide heating for users, forming a cycle.

[0020] Furthermore, in the heating season, the operation mode is such that only the thermal power unit is operated to extract steam and provide waste heat for heating, and the hot water storage tank is used as a regulating heat source. The operation mode is as follows: When the hot water supply of the heating system is insufficient to meet the heating demand, valve seven and pump three are opened to use the hot water stored in the hot water storage tank for heating. The hot water in the high-temperature layer of the hot water storage tank passes through pump three and is heated by waste heat to merge with the hot water, thereby increasing the hot water supply; When the hot water supply of the heating system exceeds the heating demand, the excess hot water can be stored in the hot water storage tank by opening valves four and seven, thereby reducing the amount of hot water supplied.

[0021] The beneficial effects achieved by the present invention are: Full-time waste heat utilization: Through cross-seasonal soil heat storage and hot water storage tanks, waste heat from the non-heating season is stored for use in winter, thereby improving the waste heat utilization rate throughout the year.

[0022] Deep peak-shaving capability: Compression heat pumps can absorb excess electricity and convert it into thermal energy, which increases the peak-shaving depth of the unit and helps stabilize the power grid.

[0023] Flexibility of multi-energy cogeneration: It supports the coordinated output of heat and electricity. In the face of large fluctuations in heat load, the system has flexible and efficient peak regulation and fast response speed. It can adjust the operating status in time to ensure stable heat supply.

[0024] More efficient energy utilization: Breaking through the limitations of traditional single waste heat recovery, comprehensively recovering multiple types of waste heat, realizing cross-seasonal heat storage and multi-energy complementarity, and significantly improving the comprehensive energy utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the working principle of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0028] Example 1. This example introduces a heating system suitable for cross-seasonal storage and deep peak regulation of waste heat from air-cooled thermal power units, including a cooling and heat exchange subsystem consisting of a gas turbine, a heat storage subsystem, a heat pump subsystem, and a heat network heating subsystem. It can realize waste heat recovery and deep peak regulation of air-cooled units in the heating season and non-heating season on a full time scale to meet the heating demand in the heating season, while reducing the amount of steam in the tower on the air-cooled island, which is beneficial to the vacuum of the unit and improves the output.

[0029] The cooling and heat exchange subsystem is used to cool the thermal power unit and boiler and supply heat to the thermal storage subsystem, heat pump subsystem, and heat network heating subsystem; The heat storage subsystem is used to store the waste heat from the air-cooling units in the cooling and heat exchange subsystem, provide heating to the target during the heating season through the hot water storage tank, and provide a low-temperature heat source for the heat pump subsystem through the buried pipe; The heat pump subsystem is used to absorb the low-temperature heat source by using a compression heat pump when the thermal power unit generates excess power, and then use electrical energy to upgrade the absorbed heat to generate a higher temperature heat source to provide to the heating network heating subsystem; The heat supply subsystem of the heat network is used to receive the heat source output by the cooling and heat exchange subsystem or the heat source output by the heat pump subsystem during the heating season to provide heating to the target that needs heating.

[0030] like Figure 1 As shown, the cooling and heat exchange subsystem includes a gas turbine 1, a steam turbine 2, a boiler 3, a flue gas waste heat exchanger 4, a valve 1 5, a pump 1 6, a flow control valve 1 7, a flow control valve 2 8, an air-cooling island 9, an air-cooled condenser 10, a valve 2 11, a pump 2 12 and a valve 3 13, which are used to cool the thermal power unit and the boiler and supply heat to other subsystems.

[0031] The heat storage subsystem includes a hot water storage tank 14, a valve four 15, a pump three 16, a valve five 17, a valve six 18, a pump four 19, a buried pipe 20 and a valve seven 21, which are used to store waste heat from the power plant and improve the energy efficiency of the unit; during the heating season, the hot water storage tank can be used directly for heating, and the buried pipe can be used as a low-temperature heat source for the heat pump.

[0032] The heat pump subsystem includes valve eight 22, valve nine 23, compression heat pump 24, pump five 25, valve ten 26 and valve eleven 27. The heat pump uses the heat stored in the soil as a low-temperature heat source to convert electrical energy into thermal energy. It can participate in the deep peak regulation of the unit, consume electricity and meet heating needs at the same time.

[0033] The heating network heating subsystem includes valve 12 28, pump 6 29, extraction steam heat exchanger 30, valve 13 31, valve 14 32, valve 15 33, valve 16 34, pump 7 35, valve 17 36, valve 18 37 and pump 8 38, which are used to meet the heating demand during the heating season. The connection relationship between the various components in the system is shown in the attached figure. Figure 1 shown.

[0034] The specific connection relationship is as follows: Cooling and heat exchange subsystem: The flue gas outlet of the gas turbine 1 is connected to the boiler 3. After the flue gas releases heat in the boiler 3, it enters the flue gas waste heat exchanger 4 for further heat release and cooling. The high-temperature and high-pressure steam outlet of the boiler 3 is respectively connected to the steam turbine 2 and pump six 29; the low-pressure steam outlet of the steam turbine 2 after work is connected to the flow control valve one 7 and the flow control valve two 8 respectively through pump one 6. The flow control valve one 7 is connected to the first inlet of the air-cooled condenser 10, and the flow control valve two 8 is connected to the inlet of the air-cooled island 9. The first outlet of the air-cooled condenser 10 and the outlet of the air-cooled island 9 are connected to the condensate discharge port. The second inlet of the air-cooled condenser 10 is connected to the valve three 13. The second outlet of the air-cooled condenser 10 is connected to the water inlet of the flue gas waste heat exchanger 4 through the pump two 12 and the valve one 5 in sequence. The water outlet of the flue gas waste heat exchanger 4 is connected to the valve two 11. The flue gas at the outlet of the gas turbine enters the boiler to release heat. After releasing heat in the boiler, it enters the flue gas waste heat exchanger for further heat release and cooling. After being heated into high-temperature and high-pressure steam in the boiler, water enters the steam turbine. Before entering the steam turbine, a portion of the steam can be extracted through pump six 29 for heating; the low-pressure steam at the outlet of the steam turbine that has completed work is then passed through pump one 6 and enters the air cooling island for cooling.

[0035] Thermal storage subsystem: The high-temperature layer of the hot water thermal storage tank 14 is connected to valve 4 15 and pump 3 16 respectively. Valve 4 15 is also connected to valve 2 11. Pump 3 16 is connected to valve 6 18 and pump 4 19 respectively through valve 5 17. Valve 6 18 is connected to one end of the buried pipe 20. The low-temperature layer of the hot water thermal storage tank 14 is connected to valve 7 21. The heat pump subsystem includes: valve eight 22, valve nine 23, compression heat pump 24, pump five 25, valve ten 26 and valve eleven 27; The other end of the buried pipe 20 is connected to the valve 7 21 through the valve 8 22 and the valve 10 26 and is connected to the first outlet of the compression heat pump 24 through the valve 9 23. The first inlet of the compression heat pump 24 is connected to the pump 4 19. The second outlet of the compression heat pump 24 is connected to the pump 5 25. The second inlet of the compression heat pump 24 is connected to the valve 11 27. Heating network heating subsystem: Valve 12 28 is connected to the first outlet of the extraction steam heat exchanger 30, and valve 12 28 is also connected to pump 1 6. The high-temperature and high-pressure steam outlet of the boiler 3 is connected to the first inlet of the steam heat exchanger 30 through pump 6 29. The second inlet of the steam heat exchanger 30 is connected to valve 15 33, valve 16 34, valve 17 36 and valve 18 37 through valve 13 31 respectively. Valve 15 33 is also connected to valve 2 11. Valve 17 36 is also connected to pump 5 25. Valve 18 37 is connected to the primary network return water through pump 8 38. The second outlet of the extraction steam heat exchanger 30 is connected to valve 16 34 and pump 7 35 respectively through valve 14 32. Pump 7 35 is connected to the primary network water supply.

[0036] Example 2, based on the same inventive concept as Example 1, introduces an operating method for a heating system suitable for storing and utilizing waste heat from air-cooled thermal power units across seasons and for deep peak regulation, including: During the non-heating season, thermal power units operate under thermal storage conditions, with the cooling and heat exchange subsystem serving as the heat source, utilizing the condensing heat of exhaust steam from the turbine outlet and the residual heat from the boiler flue gas to supply heat to the thermal storage subsystem. The system operates as follows: Valve 1 (5), flow control valve 1 (7), flow control valve 2 (8), valve 2 (11), valve 3 (13), valve 5 (17), valve 6 (18), valve 8 (22), pump 1 (6), and pump 2 (12) are open; valve 4 (15), valve 7 (21), valve 9 (23), valve 10 (26), valve 11 (27), valve 12 (28), valve 13 (31), valve 14 (32), valve 15 (33), valve 16 (34), valve 17 (36), valve 18 (37), compression heat pump 24, pump 3 (16), pump 4 (19), pump 5 (25), pump 6 (29), pump 7 (35), and pump 8 (38) are closed. The cooling and heat exchange subsystem and underground pipes 20 form a heat storage cycle system, recovering the condensation heat of the exhaust steam at the turbine outlet and the waste heat from the boiler flue gas. The heat pump subsystem and the heat supply subsystem are shut down. Driven by pump 1 (6), the steam at the turbine outlet is split into two paths, passing through flow control valve 1 (7) and flow control valve 2 (8), respectively, to enter the air-cooling island 9 and air-cooled condenser 10. After releasing heat, it condenses and is discharged. Heat source water flows through valve 3 (13) into the air-cooled condenser 10, absorbing the condensation heat of the steam at the turbine outlet and raising its temperature. It then flows through pump 2 (12) and valve 1 (5) into the flue gas waste heat exchanger 4, further absorbing the waste heat from the boiler flue gas. It then flows through valves 2 (11), 5 (17), and 6 (18) into the underground pipes 20, heating the soil and storing heat. The heat source water cools down after flowing through the underground pipes 20 and then flows back to valve 3 (13), completing a cycle that continuously recovers the condensation heat of the exhaust steam at the turbine outlet and the waste heat from the boiler flue gas.

[0037] Flow control valves 1 and 2 (8) can be used to adjust the exhaust steam flow into the air-cooling island 9 and air-cooled condenser 10, thereby regulating the condensation process and the amount of heat absorbed by the heat source water in the air-cooled condenser 10. When the hot water flow at the outlet of valve 2 (11) is too high, valves 4 (15), 7 (21), and 10 (26) are opened. Hot water from the outlet of valve 2 (11) flows through valve 4 (15) into the high-temperature layer of the hot water thermal storage tank 14 for heat storage. Simultaneously, cold water from the low-temperature layer of the hot water thermal storage tank 14 flows back to valve 3 (13) through valve 7 (21) and valve 10 (26), forming a circulation system. When the hot water flow at the outlet of valve 2 (11) is too low, pump 3 (16), valve 7 (21), and valve 10 (26) are opened. Hot water from the high-temperature layer of the hot water thermal storage tank 14 flows through pump 3 (16), valve 5 (17), and valve 6 (18) into the buried pipe 20 for compensation. Simultaneously, cold water from the outlet of valve 8 (22) flows through valve 10 (26) and valve 7 (21) into the low-temperature layer of the hot water thermal storage tank 14, forming a circulation system. Through the above adjustments, it is possible to ensure that the hot water entering the buried pipe 20 maintains an optimal flow rate, thereby improving the heat storage efficiency.

[0038] During the non-heating season, thermal power units are shut down. The cooling and heat exchange subsystem cannot serve as a heat source, relying instead on heat stored in the hot water thermal storage tank 14 to heat the inter-seasonal thermal soil. The cooling and heat exchange subsystem and the heat network heating subsystem are shut down. The system operates as follows: Valve 5 17, Valve 6 18, Valve 7 21, Valve 8 22, Valve 10 26, and Pump 3 16 are open. Valve 1 5, Flow Control Valve 1 7, Flow Control Valve 2 8, Valve 2 11, Valve 3 13, Valve 4 15, Valve 9 23, Valve 11 27, Valve 12 28, Valve 13 31, Valve 14 32, Valve 15 33, Valve 16 34, Valve 17 36, Valve 18 37, and the compression heat pump 24, Pump 1 6, Pump 2 12, Pump 4 19, Pump 5 25, Pump 6 29, Pump 7 35, and Pump 8 38 are closed. The hot water storage tank 14 and the underground pipe 20 form a heat storage circulation system, utilizing the heat stored in the hot water storage tank 14 during the unit's operation to continuously store heat in the underground pipe 20. Hot water from the high-temperature layer of the hot water storage tank 14 flows through pump 3 16 , valve 5 17 , and valve 6 18 into the underground pipe 20, heating the soil and storing heat. After cooling, it flows back to the low-temperature layer of the hot water storage tank 14 through valve 8 22 , valve 10 26 , and valve 7 21 , completing the circulation process. This ensures continuous heat storage in the underground pipe even when the unit is shut down.

[0039] During the heating season, only the thermal power units operate using steam extraction and waste heat. The cooling and heat exchange subsystem and the heat network heating subsystem serve as heat sources to heat the network return water. The heat pump subsystem and thermal storage subsystem are shut down. The system operates as follows: Valve 1 (5), flow control valve 1 (7), flow control valve 2 (8), valve 2 (11), valve 3 (13), valve 10 (26), valve 13 (31), valve 14 (32), valve 15 (33), pump 1 (6), pump 2 (12), pump 7 (35), and pump 8 (38) are open. Valve 4 (15), valve 5 (17), valve 6 (18), valve 7 (21), valve 8 (22), valve 9 (23), valve 11 (27), valve 12 (28), valve 16 (34), valve 17 (36), valve 18 (37), pump 3 (16), pump 4 (19), pump 5 (25), and pump 6 (29) are closed. The return water from the primary network passes through pump eight 38, valve ten 26, and valve three 13 in sequence to enter the air-cooled condenser 10 to absorb heat and heat up, then passes through pump two 12 and valve one 5 to enter the flue gas waste heat exchanger 4 to further absorb heat and heat up, then flows through valve two 11, valve fifteen 33, and valve thirteen 31 to enter the extraction steam heat exchanger 30 to further absorb heat and heat up, then flows through valve fourteen 32 and pump seven 35 as primary network supply water to provide heating for users, forming a cycle.

[0040] During the heating season, operating solely with the residual heat from the thermal power units, during periods of low electricity consumption, when the thermal power units are generating excess electricity, valves 6 (18), 9 (23), 11 (27), 17 (36), compression heat pump 24, pump 4 (19), and 5 (25) can be opened. Compression heat pump 24 converts excess electricity into heat. After absorbing geothermal heat, low-temperature heat source water in underground pipe 20 passes through valve 6 (18) and pump 4 (19), entering compression heat pump 24. After releasing heat as a low-temperature heat source, it flows back into underground pipe 20 through valve 9 (23), completing the circulation. Primary grid return water passes through pump 8 (38), with a portion diverted through valve 11 (27) to enter compression heat pump 25, where it absorbs heat and rises in temperature. It then passes through pump 5 (25) and valve 17 (36) to merge with hot water heated by the residual heat. It then enters the extraction heat exchanger (30) for further heating before being used as primary grid supply water to provide heating to users, completing the circulation. This method can absorb excess electricity from the units while simultaneously improving the system's heating capacity.

[0041] Based on the above-mentioned operating conditions during the heating season, the hot water storage tank 14 can be used as a regulating heat source. When the hot water supply of the system is insufficient to meet the heating demand, the hot water stored in the hot water storage tank 14 can be used for heating by opening valve seven 21 and pump three 16. The hot water in the high-temperature layer of the hot water storage tank 14 is heated by waste heat after passing through pump three 16, thereby increasing the hot water supply. When the hot water supply exceeds the heating demand, the excess hot water can be stored in the hot water storage tank 14 by opening valve four 15 and valve seven 21, thereby reducing the hot water supply.

[0042] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0043] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0044] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0045] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A heating system suitable for storing and utilizing waste heat from air-cooled thermal power units across seasons and for deep peak regulation, characterized in that: include: The cooling and heat exchange subsystem is used to cool the thermal power unit and boiler and supply heat to the thermal storage subsystem, heat pump subsystem, and heat network heating subsystem; The heat storage subsystem is used to store the waste heat from the air-cooling unit in the cooling and heat exchange subsystem, to heat the target in need of heating through the hot water storage tank during the heating season, and to provide a low-temperature heat source for the heat pump subsystem through the buried pipe; The heat pump subsystem is used to absorb the low-temperature heat source by using a compression heat pump when the thermal power unit generates excess power, and then use electrical energy to upgrade the absorbed heat to generate a higher temperature heat source to provide to the heating network heating subsystem; The heat supply subsystem of the heat network is used to receive the heat source output by the cooling and heat exchange subsystem or the heat source output by the heat pump subsystem during the heating season to provide heating to the target that needs heating.

2. The heating system suitable for storing and utilizing waste heat from air-cooled thermal power units across seasons and performing deep peak load regulation according to claim 1 is characterized in that: The cooling and heat exchange subsystem includes: a gas turbine (1), a steam turbine (2), a boiler (3), a flue gas waste heat exchanger (4), a valve 1 (5), a pump 1 (6), a flow control valve 1 (7), a flow control valve 2 (8), an air cooling island (9), an air condenser (10), a valve 2 (11), a pump 2 (12) and a valve 3 (13); The flue gas outlet of the gas turbine (1) is connected to the boiler (3). After the flue gas releases heat in the boiler (3), it enters the flue gas waste heat exchanger (4) for further heat release and cooling. The high-temperature and high-pressure steam outlet of the boiler (3) is respectively connected to the steam turbine (2) and pump six (29); the low-pressure steam outlet of the steam turbine (2) after work is respectively connected to flow control valve one (7) and flow control valve two (8) through pump one (6). Flow control valve one (7) is connected to the first inlet of the air-cooled condenser (10). Flow control valve two (8) is connected to the inlet of the air-cooled island (9). The first outlet of the air-cooled condenser (10) and the outlet of the air-cooled island (9) are connected to the condensate discharge port. The second inlet of the air-cooled condenser (10) is connected to valve three (13). The second outlet of the air-cooled condenser (10) is connected to the water inlet of the flue gas waste heat exchanger (4) through pump two (12) and valve one (5). The water outlet of the flue gas waste heat exchanger (4) is connected to valve two (11). The heat storage subsystem includes: a hot water heat storage tank (14), a valve four (15), a pump three (16), a valve five (17), a valve six (18), a pump four (19), an underground pipe (20) and a valve seven (21); The high temperature layer of the hot water thermal storage tank (14) is connected to valve four (15) and pump three (16) respectively. Valve four (15) is also connected to valve two (11). Pump three (16) is connected to valve six (18) and pump four (19) respectively through valve five (17). Valve six (18) is connected to one end of the buried pipe (20). The low temperature layer of the hot water thermal storage tank (14) is connected to valve seven (21). The heat pump subsystem includes: valve eight (22), valve nine (23), compression heat pump (24), pump five (25), valve ten (26) and valve eleven (27); The other end of the buried pipe (20) is connected to valve seven (21) through valve eight (22) and valve ten (26) and is connected to the first outlet of the compression heat pump (24) through valve nine (23), the first inlet of the compression heat pump (24) is connected to pump four (19), the second outlet of the compression heat pump (24) is connected to pump five (25), and the second inlet of the compression heat pump (24) is connected to valve eleven (27); The heat supply subsystem of the heat network includes: valve 12 (28), pump 6 (29), extraction steam heat exchanger (30), valve 13 (31), valve 14 (32), valve 15 (33), valve 16 (34), pump 7 (35), valve 17 (36), valve 18 (37) and pump 8 (38); Valve 12 (28) is connected to the first outlet of the steam extraction heat exchanger (30), valve 12 (28) is also connected to pump 1 (6), the high-temperature and high-pressure steam outlet of the boiler (3) is connected to the first inlet of the steam heat exchanger (30) through pump 6 (29), the second inlet of the steam heat exchanger (30) is respectively connected to valve 15 (33), valve 16 (34), valve 17 (36) and valve 18 (37) through valve 13 (31), valve 15 (33) is also connected to valve 2 (11), valve 17 (36) is also connected to pump 5 (25), valve 18 (37) is connected to the primary network return water through pump 8 (38), the second outlet of the steam extraction heat exchanger (30) is respectively connected to valve 16 (34) and pump 7 (35) through valve 14 (32), and pump 7 (35) is connected to the primary network water supply.

3. An operating method for a heating system suitable for storing and utilizing waste heat from air-cooled thermal power units across seasons and performing deep peak load regulation based on claim 2, characterized in that: include: During the non-heating season, when the thermal power unit is in operation, the cooling and heat exchange subsystem is used as the heat source, and the exhaust steam condensation heat at the turbine outlet and the waste heat from the boiler flue gas are used to heat the thermal storage subsystem. During the non-heating season, the thermal power unit is shut down and the heat stored in the hot water thermal storage tank (14) is used to heat the cross-seasonal thermal storage soil. The cooling and heat exchange subsystem and the heat network heating subsystem are shut down. During the heating season, only the thermal power units are operating to extract steam and provide waste heat for heating. The cooling and heat exchange subsystem and the heating network heating subsystem are used as heat sources to heat the return water of the heating network. The heat pump subsystem and the heat storage subsystem are in a shutdown state.

4. The operating method according to claim 3, characterized in that: The heat storage operation in the non-heating season, the operation mode of the thermal power unit operation, the cooling heat exchange subsystem as the heat source, and the use of the exhaust steam condensation heat at the turbine outlet and the waste heat of the boiler flue gas to heat the heat storage subsystem is as follows: Valve 1 (5), flow control valve 1 (7), flow control valve 2 (8), valve 2 (11), valve 3 (13), valve 5 (17), valve 6 (18), valve 8 (22), pump 1 (6), pump 2 (12) are open, valve 4 (15), valve 7 (21), valve 9 (23), valve 10 (26), valve 11 (27), valve 12 (28), valve 13 (31), valve 14 (32), valve 15 (33), valve 16 (34), valve 17 (36), valve 18 (37), compression heat pump (24), pump 3 (16), pump 4 (19), pump 5 (25), pump 6 (29), pump 7 (35), pump 8 (38) are closed; the cooling heat exchange subsystem and the buried pipe (20) form a heat storage circulation system to recover the exhaust steam condensation heat at the turbine outlet and the waste heat of the boiler flue gas; the heat pump subsystem and the heat network heating subsystem are in a shutdown state; The steam at the outlet of the turbine is driven by pump 1 (6) and is divided into two paths. The paths pass through flow control valve 1 (7) and flow control valve 2 (8) and enter the air cooling island (9) and air condenser (10). After releasing heat, the paths are condensed and discharged. The heat source water flows into the air condenser (10) through valve 3 (13) to absorb the condensation heat of the steam at the outlet of the turbine and the temperature increases. The water then flows into the flue gas waste heat heat exchanger (4) through pump 2 (12) and valve 1 (5) and further absorbs the waste heat of the boiler flue gas. The water then flows into the buried pipe (20) through valve 2 (11), valve 5 (17) and valve 6 (18) to heat the soil and store heat. The heat source water flows through the buried pipe (20) and the temperature decreases. The water then flows back to valve 3 (13), forming a cycle to continuously recover the condensation heat of the exhaust steam at the outlet of the turbine and the waste heat of the boiler flue gas.

5. The operating method according to claim 4, characterized in that: When the hot water flow rate at the outlet of valve two (11) exceeds the preset upper limit, valve four (15), valve seven (21) and valve ten (26) are opened, and the hot water at the outlet of valve two (11) flows into the high-temperature layer of the hot water heat storage tank (14) through valve four (15) for heat storage. At the same time, the cold water in the low-temperature layer of the hot water heat storage tank (14) flows back to valve three (13) through valve seven (21) and valve ten (26), forming a cycle.

6. The operating method according to claim 4, characterized in that: When the hot water flow rate at the outlet of valve two (11) is lower than the preset lower limit, pump three (16), valve seven (21) and valve ten (26) are opened, and the hot water in the high-temperature layer of the hot water storage tank (14) flows into the buried pipe (20) through pump three (16), valve five (17) and valve six (18) as compensation. At the same time, the cold water at the outlet of valve eight (22) flows into the low-temperature layer of the hot water storage tank (14) through valve ten (26) and valve seven (21), forming a cycle.

7. The operating method according to claim 3, characterized in that: In the non-heating season, the heat storage operation is carried out, the thermal power unit is shut down, and the heat stored in the hot water thermal storage tank (14) is used to heat the cross-season heat storage soil. The cooling heat exchange subsystem and the heat network heating subsystem are in the shut down state. The operation mode is as follows: Valve five (17), valve six (18), valve seven (21), valve eight (22), valve ten (26), and pump three (16) are opened, and valve one (5), flow control valve one (7), flow control valve two (8), valve two (11), valve three (13), valve four (15), valve nine (23), valve eleven (27), valve twelve (28), valve thirteen (31), valve fourteen (32), valve fifteen (33), valve sixteen (34), valve seventeen (36), valve eighteen (37), compression heat pump (24), pump one (6), pump two (12), pump four (19), pump five (25), pump six (29), pump seven (35), and pump eight (38) are closed; the hot water thermal storage tank (14) and the buried pipe (20) form a heat storage circulation system, and the heat stored in the hot water thermal storage tank (14) during the operation phase of the unit is used to continuously store heat in the buried pipe (20); The hot water in the high temperature layer of the hot water storage tank (14) flows into the buried pipe (20) through pump three (16), valve five (17), and valve six (18) to heat the soil and store heat. After the temperature drops, it flows back to the low temperature layer of the hot water storage tank (14) through valve eight (22), valve ten (26), and valve seven (21), forming a cycle.

8. The operating method according to claim 3, characterized in that: During the heating season, the operation mode is as follows: Valve 1 (5), flow control valve 1 (7), flow control valve 2 (8), valve 2 (11), valve 3 (13), valve 10 (26), valve 13 (31), valve 14 (32), valve 15 (33), pump 1 (6), pump 2 (12), pump 7 (35), pump 8 (38) are open, valve 4 (15), valve 5 (17), valve 6 (18), valve 7 (21), valve 8 (22), valve 9 (23), valve 11 (27), valve 12 (28), valve 16 (34), valve 17 (36), valve 18 (37), pump 3 (16), pump 4 (19), pump 5 (25) and pump 6 (29) are closed; The return water from the primary network passes through pump eight (38), valve ten (26), and valve three (13) in sequence and enters the air-cooled condenser (10) to absorb heat and heat up. It then passes through pump two (12) and valve one (5) and enters the flue gas waste heat exchanger (4) to further absorb heat and heat up. It then flows through valve two (11), valve fifteen (33), and valve thirteen (31) and enters the steam extraction heat exchanger (30) to further absorb heat and heat up. It then flows through valve fourteen (32) and pump seven (35) as the primary network water supply to provide heating for users, forming a cycle.

9. The operating method according to claim 8, characterized in that: When the thermal power unit is only operating in the steam extraction and waste heat heating mode during the heating season and the thermal power unit generates excess power, valve six (18), valve nine (23), valve eleven (27), valve seventeen (36), compression heat pump (24), pump four (19), and pump five (25) are opened, and the compression heat pump (24) converts the excess power into heat; After the low-temperature heat source water in the buried pipe (20) absorbs geothermal heat, it passes through valve six (18) and pump four (19) and enters the compression heat pump (24). After releasing heat as a low-temperature heat source, it flows back to the buried pipe (20) through valve nine (23), forming a cycle. After the primary network return water passes through pump eight (38), a portion of it is diverted and passes through valve eleven (27) to enter the compression heat pump (25) to absorb heat and heat up, and then passes through pump five (25) and valve seventeen (36) to merge with the hot water heated by waste heat, and enters the steam extraction heat exchanger (30) for further heating and then serves as the primary network supply water to provide heating for users, forming a cycle.

10. The operating method according to claim 8, characterized in that: In the heating season, only the thermal power unit is operated to extract steam and provide waste heat for heating, and the hot water storage tank (14) is used as a regulating heat source. The operation mode is: When the hot water supply of the heating system is insufficient to meet the heating demand, valve seven (21) and pump three (16) are opened to use the hot water stored in the hot water storage tank (14) for heating. The hot water in the high-temperature layer of the hot water storage tank (14) passes through pump three (16) and is heated by waste heat to merge with the hot water, thereby increasing the hot water supply; When the amount of hot water supplied by the heating system exceeds the heating demand, the excess hot water can be stored in the hot water storage tank (14) by opening valve four (15) and valve seven (21), thereby reducing the amount of hot water supplied.

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