Comprehensive energy utilization system for heat, electricity and gas storage and supply

Abstract

The invention belongs to the technical field of compressed air energy storage, and discloses a heat, electricity and gas storage and supply comprehensive energy utilization system which comprises a heat supply network water return pipeline, a waste heat utilization device, a compressed air energy storage device and an air turbine power generation device. The waste heat utilization device comprises a first heat pump unit and a second heat pump unit, the first heat pump unit comprises a first heat pump body and a first waste heat circulation pipeline, the first waste heat circulation pipeline is connected with the first heat pump body and the power plant unit, and the second heat pump unit comprises a second heat pump body and a second waste heat circulation pipeline. The second waste heat circulation pipeline is connected with the second heat pump body and the power plant unit, the heat supply network water return pipeline comprises a first path and a second path, the first heat pump unit is connected with the first path, and the second heat pump unit is connected with the second path; the compressed air energy storage device is connected with the waste heat utilization device and the air turbine power generation device. In this way, waste heat can be effectively utilized, and the supply flexibility and the comprehensive utilization efficiency of energy are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage, and in particular to a comprehensive energy utilization system for storage and supply of heat, electricity and gas. Background Art

[0002] Compressed air energy storage is a large-scale energy storage technology that uses excess electricity to compress air during periods of low electricity demand and stores it in large gas storage facilities. It then releases the compressed air during periods of peak electricity demand and generates electricity through turbines, thereby achieving peak shaving and valley filling of electricity.

[0003] In existing thermal power plants and heating networks, there is a lot of unused heat (for example, the heat in the exhaust steam after turbine power generation and the heat in the circulating water of power plant units). This waste heat is usually discharged directly or returned to the system after simple treatment. Low-grade waste heat is difficult to be used directly for power generation or other high-value purposes. In addition, since there are various operating conditions of power plant units, the demand for waste heat recovery will also change accordingly. It is difficult to directly apply waste heat to compressed air energy storage systems. There are problems such as low comprehensive utilization efficiency of heat, electricity and gas energy and low flexibility of energy supply under different operating conditions. Summary of the invention

[0004] The purpose of the present invention is to provide an integrated energy utilization system for storage and supply of heat, electricity and gas, so as to solve the problems of low comprehensive utilization efficiency of heat, electricity and gas energy and low flexibility of energy supply under different working conditions.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A comprehensive energy utilization system for heat, electricity and gas storage and supply, comprising: a heat network return pipe, the heat network return pipe is connected to the heat network; a waste heat utilization device, the waste heat utilization device comprises a first heat pump unit and a second heat pump unit, the first heat pump unit comprises a first heat pump body and a first waste heat circulation pipeline, the first waste heat circulation pipeline is connected to the first heat pump body and a power plant unit, the second heat pump unit comprises a second heat pump body and a second waste heat circulation pipeline, the second waste heat circulation pipeline is connected to the second heat pump body and the power plant unit, the heat network return pipe comprises a first path and a second path, the first heat pump unit is connected to the first path, and the second heat pump unit is connected to the second path to increase the medium temperature in the first path and the second path; a compressed air energy storage device and an air turbine power generation device, the compressed air energy storage device is connected to the waste heat utilization device and the air turbine power generation device, the compressed air energy storage device comprises a compressor, and the air turbine power generation device comprises a turbine.

[0007] Preferably, the compressed air energy storage device also includes a cold energy storage tank and a hot energy storage tank, the cold energy storage tank is connected to the compressor and the hot energy storage tank, the hot energy storage tank is connected to the power plant unit, the heating network and the compressor, and the air turbine power generation device also includes a power generation cold water tank and a power generation hot water tank, the power generation cold water tank is connected to the turbine and the hot energy storage tank, the hot energy storage tank is connected to the power plant unit and the turbine.

[0008] Preferably, the compressed air energy storage device further comprises an energy storage cold water tank bypass and an energy storage hot water tank bypass, the energy storage cold water tank bypass is connected in parallel with the energy storage cold water tank, and the energy storage hot water tank bypass is connected in parallel with the energy storage hot water tank.

[0009] Preferably, the compressed air energy storage device also includes a non-heating season condensate heater and a heating season heat exchanger, the non-heating season condensate heater is arranged between the energy storage hot water tank and the energy storage cold water tank, the non-heating season condensate heater is connected to the power plant unit to increase the temperature of the condensate, the heating season heat exchanger is arranged between the energy storage hot water tank and the energy storage cold water tank, and the heating season heat exchanger is connected to the heat network.

[0010] Preferably, the comprehensive energy utilization system for storage and supply of heat, electricity and gas also includes a waste heat collection device, the waste heat collection device includes a collection component, the collection component includes a waste heat exchanger and a waste heat regulating valve, the waste heat exchanger is connected to the waste heat regulating valve, the collection component is connected to the power plant unit, the first waste heat circulation pipeline includes a waste heat circulation water supply pipeline and a waste heat circulation return water pipeline, the collection component is arranged between the waste heat circulation return water pipeline and the waste heat circulation water supply pipeline, the waste heat circulation return water pipeline and the waste heat circulation water supply pipeline are both connected to the first heat pump body.

[0011] Preferably, the waste heat collection device also includes a boiler sewage pipe, a cold slag drainage pipe, a desulfurization slurry pipe and other waste heat pipes, and four collection components are provided, and the four collection components are respectively connected to the boiler sewage pipe, the cold slag drainage pipe, the desulfurization slurry pipe and the other waste heat pipes.

[0012] Preferably, the comprehensive energy utilization system for storage and supply of heat, electricity and gas also includes a gas storage device, and the gas storage device is connected to both the compressor and the turbine.

[0013] Preferably, the output end of the gas storage device is connected to a pressure reducing valve.

[0014] Preferably, the air turbine power generation device also includes a steam circulation component and a valley electricity heat storage heat exchanger, the valley electricity heat storage heat exchanger is arranged between the power generation cold water tank and the power generation hot water tank, the steam circulation component is connected to the valley electricity heat storage heat exchanger and the power plant unit, and is used to transfer the heat in the steam output by the power plant unit to the valley electricity heat storage heat exchanger.

[0015] Preferably, the waste heat utilization device further includes a first regulating valve and a second regulating valve, wherein the first regulating valve is arranged on the first path, and the second regulating valve is arranged on the second path.

[0016] Beneficial effects of the present invention:

[0017] A comprehensive energy utilization system for heat, electricity and gas storage and supply, comprising a heat network return pipe, a waste heat utilization device, a compressed air energy storage device and an air turbine power generation device, wherein the heat network return pipe is connected to the heat network; the waste heat utilization device comprises a first heat pump unit and a second heat pump unit, the first heat pump unit comprises a first heat pump body and a first waste heat circulation pipeline, the first waste heat circulation pipeline is connected to the first heat pump body and the power plant unit, the second heat pump unit comprises a second heat pump body and a second waste heat circulation pipeline, the second waste heat circulation pipeline is connected to the second heat pump body and the power plant unit, the heat network return pipe comprises a first path and a second path, the first heat pump unit is connected to the first path, and the second heat pump unit is connected to the second path, so as to increase the medium temperature in the first path and the second path; the compressed air energy storage device is connected to the waste heat utilization device and the air turbine power generation device, the compressed air energy storage device comprises a compressor, and the air turbine power generation device comprises a turbine.

[0018] In this way, the low-grade thermal energy carried by the exhaust steam waste heat of the steam turbine of the power plant unit and the circulating water waste heat can be utilized by the first heat pump unit and the second heat pump unit respectively, and after being converted into medium-grade thermal energy, they can be used to heat the return water of the heat network to meet the waste heat recovery needs of the power plant units under different operating conditions. Coupling the power plant units, the heat network, the compressed air energy storage device, and the air turbine power generation device can achieve multi-energy complementarity and improve the efficiency of energy utilization and supply of heat, electricity, and gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of a comprehensive energy utilization system for heat, electricity and gas storage and supply in one embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of a first partial structure of a comprehensive energy utilization system for heat, electricity and gas storage and supply in one embodiment of the present invention, which is intended to show a compressed air energy storage device;

[0021] Figure 3It is a second partial structural schematic diagram of the integrated energy utilization system for heat, electricity and gas storage and supply in one embodiment of the present invention, which is intended to show an air turbine power generation device;

[0022] Figure 4 It is a schematic diagram of the third partial structure of the comprehensive energy utilization system for storage and supply of heat, electricity and gas in one embodiment of the present invention, which is intended to show the waste heat collection device.

[0023] In the figure:

[0024] 1. Heat network return water pipeline; 11. First route; 12. Second route; 2. Waste heat utilization device; 21. First heat pump unit; 211. First heat pump body; 212. First waste heat circulation pipeline; 2121. Waste heat circulation water supply pipeline; 2122. Waste heat circulation return water pipeline; 213. First heat source pipeline; 22. Second heat pump unit; 221. Second heat pump body; 222. Second waste heat circulation pipeline; 223. Second heat source pipeline; 23. First regulating valve; 24. Second regulating valve; 3. Compressed air energy storage device; 31. Compressor; 311. Cooler; 32. Energy storage cold water tank; 321. Energy storage cold water pump; 322. Energy storage cold water shut-off valve; 33. Energy storage hot water tank; 331. Energy storage hot water pump; 332. Energy storage hot water shut-off valve; 34. Energy storage cold water tank bypass; 341. First check valve; 35. Energy storage hot water tank bypass; 351. Second check valve; 36. Non-heating season condensate heater; 37. Heating season heat exchanger; 38. First heater bypass; 39. Second heater bypass; 4. Air turbine power generation device; 41. Turbine; 411. Air expansion heater; 42. Power generation cold water tank; 421. Power generation cold water pump; 43. Power generation hot water tank; 431. Power generation hot water pump; 44. Steam circulation component; 441. Steam input pipe; 442. Condensate output pipe; 45. Valley power storage heat exchanger; 5. Waste heat collection device; 51. Collection component; 511. Waste heat exchanger; 512. Waste heat regulating valve; 52. Boiler sewage pipe; 53. Cold slag drainage pipe; 54. Desulfurization slurry pipe; 55. Other waste heat pipes; 56. Waste heat circulation water pump; 6. Gas storage device; 61. Pressure reducing valve. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0026] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0029] See also Figures 1 to 4The present invention provides a comprehensive energy utilization system for heat, electricity and gas storage and supply, comprising a heat network return water pipeline 1, a waste heat utilization device 2, a compressed air energy storage device 3 and an air turbine power generation device 4, wherein the heat network return water pipeline 1 is connected to the heat network (not shown in the figure); the waste heat utilization device 2 comprises a first heat pump unit 21 and a second heat pump unit 22, wherein the first heat pump unit 21 comprises a first heat pump body 211 and a first waste heat circulation pipeline 212, wherein the first waste heat circulation pipeline 212 is connected to the first heat pump body 211 and a power plant unit (not shown in the figure), and the second heat pump unit 22 comprises The second heat pump body 221 and the second waste heat circulation pipeline 222 are connected to each other, and the second waste heat circulation pipeline 222 and the second heat pump body 221 and the power plant units are all connected. The heat network return water pipeline 1 includes a first path 11 and a second path 12. The first heat pump unit 21 is connected to the first path 11, and the second heat pump unit 22 is connected to the second path 12 to increase the medium temperature in the first path 11 and the second path 12. The compressed air energy storage device 3 is connected to the waste heat utilization device 2 and the air turbine power generation device 4. The compressed air energy storage device 3 includes a compressor 31, and the air turbine power generation device 4 includes a turbine 41.

[0030] Among them, the heat network return water pipeline 1 is used to circulate the heat network return water to the heater of the heat network for reheating. The first heat pump body 211 and the second heat pump body 221 are both lithium bromide absorption heat pumps. The first heat pump unit 21 also includes a first heat source pipeline 213, and the second heat pump unit 22 also includes a second heat source pipeline 223. The input end of the first heat source pipeline 213 and the input end of the second heat source pipeline 223 are both connected to the steam extraction output end of the power station steam turbine unit heat network, and the output end of the first heat source pipeline 213 and the output end of the second heat source pipeline 223 are both connected to the condensate water system of the heat network.

[0031] Furthermore, the first waste heat circulation pipeline 212 is connected to the waste heat circulation water system of the power plant unit for heat exchange, the input end of the second waste heat circulation pipeline 222 is connected to the exhaust steam output end of the power plant unit, and the output end of the second waste heat circulation pipeline 222 is connected to the condensate water system of the power plant unit to utilize the low-grade thermal energy in the exhaust steam. The output end of the first heat pump unit 21 and the output end of the second heat pump unit 22 are both connected to the compressed air energy storage device 3; the output end of the heat network return water pipe 1 is connected to the compressed air energy storage device 3.

[0032] It should be noted that the low-grade thermal energy in the power plant unit can be transported to the first heat pump unit 21 through the first waste heat circulation pipeline 212, and the low-grade thermal energy in the exhaust steam output by the steam turbine in the power plant unit can be transported to the second heat pump unit 22 through the second waste heat circulation pipeline 222. The high-grade thermal energy in the first heat source pipeline 213 and the second heat source pipeline 223 can be mixed with the low-grade thermal energy in the first waste heat circulation pipeline 212 and the second waste heat circulation pipeline 222 respectively to obtain medium-grade thermal energy. Since the heat network return water pipeline 1 is coupled to the compressed air energy storage device 3, the compressed heat energy generated by the first heat pump unit 21, the second heat pump unit 22 and the compressed air energy storage device 3 in the process of compressing air can be used to heat the return water in the heat network return water pipeline 1.

[0033] In this way, the lithium bromide absorption heat pump can absorb the waste heat of the steam turbine of the power plant unit and the waste heat of the circulating water of the power plant unit, realize the effective recovery of low-grade thermal energy in the power plant unit, improve the comprehensive utilization efficiency of energy, and reduce energy waste. In addition, the operating principle of the lithium bromide absorption heat pump is relatively simple, and the quality requirements of the driving heat source are not high. It can adapt to the waste heat recovery needs of the power plant unit under different working conditions and ensure the stable operation of the system; by coupling the power plant unit, the heat network, the compressed air energy storage device 3, and the air turbine power generation device 4, multi-energy complementarity can be achieved, which is beneficial to power supply, heat supply, and peak regulation, and improves the efficiency of energy utilization and supply of heat, electricity, and gas.

[0034] See also Figure 1 In some embodiments, the waste heat utilization device 2 further includes a first regulating valve 23 and a second regulating valve 24 . The first regulating valve 23 is disposed in the first path 11 , and the second regulating valve 24 is disposed in the second path 12 .

[0035] In this way, the first regulating valve 23 and the second regulating valve 24 can respectively control the amount of heat network return water entering the first heat pump unit 21 and the second heat pump unit 22, thereby flexibly adjusting the amount of water passing through the first regulating valve 23 and the second regulating valve 24 according to the exhaust steam of the power grid unit and the waste heat of the circulating water, thereby improving the flexibility of energy supply and the comprehensive utilization efficiency under different working conditions.

[0036] See also Figure 2 and Figure 3 In some embodiments, the compressed air energy storage device 3 further includes an energy storage cold water tank 32 and an energy storage hot water tank 33. The energy storage cold water tank 32 is indirectly connected to the compressor 31 and the energy storage hot water tank 33 through the system. The energy storage hot water tank 33 is indirectly connected to the power plant unit, the heat network, and the compressor 31 through the system. The air turbine power generation device 4 further includes a power generation cold water tank 42 and a power generation hot water tank 43. The power generation cold water tank 42 is indirectly connected to the turbine 41 and the power generation hot water tank 43 through the system. The power generation hot water tank 43 is indirectly connected to the power plant unit and the turbine 41 through the system.

[0037] In this embodiment, the compressor 31 is provided with a plurality of compression stages in series, and a cooler 311 is provided between adjacent compression stages, which is used to reduce the air temperature output by each compression stage in the middle of the compressor 31. The energy storage cold water tank 32 is connected to an energy storage cold water pump 321 and two energy storage cold water shut-off valves 322. The energy storage cold water pump 321 is provided between the output end of the energy storage cold water tank 32 and the input end of the cooler 311, and the energy storage cold water pump 321 is connected to the cooler 311, which is used to transport the low-temperature water in the energy storage cold water tank 32 to the cooler 311. The two energy storage cold water shut-off valves 322 are respectively provided At the output end and input end of the energy storage cold water tank 32, the energy storage cold water shut-off valve 322 arranged at the output end of the energy storage cold water tank 32 is located upstream of the energy storage cold water pump 321; correspondingly, the energy storage hot water tank 33 is connected to the energy storage hot water pump 331 and two energy storage hot water shut-off valves 332, the energy storage hot water pump 331 is arranged between the output end of the energy storage hot water tank 33 and the input end of the cold water tank, the two energy storage hot water shut-off valves 332 are respectively arranged at the output end and input end of the energy storage hot water tank 33, and the energy storage hot water shut-off valve 332 arranged at the output end of the energy storage hot water tank 33 is located upstream of the energy storage hot water pump 331.

[0038] Furthermore, the turbine 41 is provided with a plurality of expansion work stages, and the turbine 41 is connected to an air expansion heater 411 for heating the compressed air to improve the efficiency of the air expansion work in the turbine 41; the output end of the power generation cold water tank 42 is connected to a power generation cold water pump 421, and the output end of the power generation hot water tank 43 is connected to a power generation hot water pump 431.

[0039] In this way, by setting up a multi-stage compressor 31 and a multi-stage turbine 41, the compressed air energy storage efficiency and the air turbine power generation efficiency can be improved, and the heat generated by the compressor 31 when compressing the air can be stored in the energy storage hot water tank 33 during the off-season, and can also be used to heat the return water of the heating network during the heating season, so as to fully utilize the energy; during the peak power period of the non-heating season, the electricity price is high and the electricity demand is large, the hot water in the power generation hot water tank 43 releases heat and is used to heat the air entering the turbine 41, so as to improve the power generation efficiency, and the excess heat can also be used for power generation, through the turbine 41 and the steam turbine of the power plant unit to generate electricity, so as to flexibly use the waste heat according to different working conditions, and improve the comprehensive utilization efficiency of heat, electricity and gas energy and the flexibility of energy supply.

[0040] In this embodiment, the compressor 31 is provided with 7 compression stages, the cooler 311 is provided with 6 stages, the turbine 41 is provided with 3 expansion working stages, and the air heater 411 is provided with 2 stages. The number of compression stages in the compressor 31, the number of coolers 311, the number of expansion working stages of the turbine 41 and the number of air expansion heaters 411 can all be flexibly adjusted and are not listed in detail here.

[0041] See also Figure 2 In some embodiments, the compressed air energy storage device 3 further includes an energy storage cold water tank bypass 34 and an energy storage hot water tank bypass 35, the energy storage cold water tank bypass 34 is connected in parallel with the energy storage cold water tank 32, and the energy storage hot water tank bypass 35 is connected in parallel with the energy storage hot water tank 33.

[0042] In this embodiment, a first check valve 341 is provided on the energy storage cold water tank bypass 34, and a second check valve 351 is provided on the energy storage hot water tank bypass 35, so as to flexibly switch the flow of the medium in the compressed air energy storage device 3 in the heating season and the non-heating season, and prevent the water in the energy storage hot water tank 33 and the energy storage cold water tank 32 from flowing in reverse to the inlet of the energy storage hot water tank 33 and the inlet of the energy storage cold water tank 32 through the energy storage hot water tank bypass 35 and the energy storage cold water tank bypass 34 respectively.

[0043] In this way, during the heating season, the energy storage hot water shut-off valve 332 and the energy storage cold water shut-off valve 322 are closed to allow the medium to flow in the energy storage cold water tank bypass 34, and the heat generated when the compressor 31 compresses the air can be directly used to heat the return water of the heating network, reducing other heat required for subsequent heating of the return water of the heating network; during the non-heating season, the energy storage hot water shut-off valve 332 and the energy storage cold water shut-off valve 322 are opened, so that the waste heat generated between the compression stages and the last stage of the compressor 31 can be stored in the energy storage hot water tank 33, thereby improving the comprehensive utilization efficiency of heat, electricity and gas energy under different working conditions and the flexibility of energy supply.

[0044] See also Figure 2 In some embodiments, the compressed air energy storage device 3 also includes a non-heating season condensate heater 36 and a heating season heat exchanger 37. The non-heating season condensate heater 36 is arranged between the energy storage hot water tank 33 and the energy storage cold water tank 32. The non-heating season condensate heater 36 is connected to the power plant unit to increase the temperature of the condensate. The heating season heat exchanger 37 is arranged between the energy storage hot water tank 33 and the energy storage cold water tank 32. The heating season heat exchanger 37 is connected to the heat network.

[0045] Among them, the non-heating season condensate heater 36 is connected to the condensate system of the power plant unit, so that the condensate of the power plant unit can be heated by the non-heating season condensate heater 36 and returned to the condensate system of the power plant unit; the heating season heat exchanger 37 is connected to the heating network return pipe 1, which is used to heat the return water in the heating network return pipe 1.

[0046] In this way, during the off-heating season peak power period, the condensate of the power plant units can be heated by the off-heating season condensate heater 36, and the heat recovery and extraction of the steam turbine of the power plant units can be reduced, thereby improving the system cycle thermal efficiency and energy utilization efficiency; during the heating season, the heat carried by the water in the energy storage hot water tank 33 can heat the return water in the heat network return water pipe 1 through the heating season heat exchanger 37, reducing the heat required for the heat network heater to heat the return water, thereby improving the comprehensive utilization efficiency of heat, electricity and gas energy under different working conditions and the flexibility of energy supply.

[0047] It can be understood that the compressed air energy storage device may also include a first heater bypass 38 and a second heater bypass 39. The first heater bypass 38 is connected in parallel with the non-heating season condensate heater 36, and the second heater bypass 39 is connected in parallel with the heating season heat exchanger 37, so that the medium can selectively flow through the non-heating season condensate heater 36 and the heating season heat exchanger 37. The setting position and number of the bypass can be flexibly adjusted according to the actual design, and no more examples are given here.

[0048] See also Figure 1 and Figure 4 In some embodiments, the integrated energy utilization system for storage and supply of heat, electricity and gas also includes a waste heat collection device 5, the waste heat collection device 5 includes a collection component 51, the collection component 51 includes a waste heat exchanger 511 and a waste heat regulating valve 512, the waste heat exchanger 511 is connected to the waste heat regulating valve 512, the collection component 51 is connected to the power plant unit, the first waste heat circulation pipeline 212 includes a waste heat circulation water supply pipeline 2121 and a waste heat circulation return water pipeline 2122, the collection component 51 is arranged between the waste heat circulation return water pipeline 2122 and the waste heat circulation water supply pipeline 2121, the waste heat circulation return water pipeline 2122 and the waste heat circulation water supply pipeline 2121 are both connected to the first heat pump body 211.

[0049] Among them, the output end of the waste heat circulation water supply pipe 2121 and the input end of the waste heat circulation return water pipe 2122 are respectively connected to the first heat pump body 211, so that the low-grade thermal energy quality and heat carried by the medium in the waste heat circulation water supply pipe 2121 are improved under the action of the high-grade thermal energy of the first heat source pipeline 213, and the waste heat circulation return water pipe 2122 further absorbs the waste heat of the circulating water of the power plant unit. The waste heat exchanger 511 is a surface heat exchanger.

[0050] In this way, the waste heat of the circulating water of the power plant units can be collected by the collection component 51 and transported to the first heat pump unit 21 through the waste heat circulation water supply pipe 2121, and the first heat pump unit 21 can utilize the low-grade thermal energy in the circulating water of the power plant units to heat the return water in the heat network return pipe 1 under the action of high-grade thermal energy, thereby realizing the utilization of low-grade thermal energy and improving the comprehensive utilization efficiency of heat, electricity and gas energy and the flexibility of energy supply under different working conditions.

[0051] See also Figure 4 In some embodiments, the waste heat collection device 5 also includes a boiler sewage pipe 52, a cold slag drainage pipe 53, a desulfurization slurry pipe 54 and other waste heat pipes 55, and a plurality of collection components 51 are provided. The plurality of collection components 51 are respectively connected to the boiler sewage pipe 52, the cold slag drainage pipe 53, the desulfurization slurry pipe 54, other waste heat pipes 55, etc., that is, the plurality of collection components 51 are arranged in parallel.

[0052] In this embodiment, the boiler sewage pipe 52, the cold slag drainage pipe 53, the desulfurization slurry pipe 54 and other waste heat pipes 55 are all connected to the power plant units. A group of collection components 51 includes a waste heat exchanger 511 and a waste heat regulating valve 512. The boiler sewage pipe 52, the cold slag drainage pipe 53, the desulfurization slurry pipe 54, and other waste heat pipes 55 are respectively connected to the four waste heat exchangers 511. The waste heat regulating valve 512 in each group of collection components 51 is arranged upstream of the waste heat exchanger 511, and the output end of the waste heat regulating valve 512 is connected to the waste heat circulation water supply pipe 2121, which is used to transport the collected waste heat to the first heat pump unit 21. Other waste heat pipes 55 can collect other forms of waste heat, such as waste heat from turbine exhaust steam. The waste heat exchanger 511 can absorb gaseous or liquid waste heat into the circulating water in the waste heat circulation water supply pipe 2121.

[0053] In this way, the sewage, cold slag and desulfurization slurry discharged from the boiler of the power plant unit can be heat exchanged with the waste heat exchanger 511 through the boiler sewage pipe 52, the cold slag drainage pipe 53 and the desulfurization slurry pipe 54 respectively, so that the waste heat exchanger 511 can transport the low-grade waste heat to the first heat pump unit 21, and the waste heat regulating valve 512 can adjust the amount of circulating water entering the first heat pump unit 21 under different working conditions.

[0054] It is understandable that the waste heat collection device 5 can also be connected to other pipelines of the power plant unit, and this embodiment does not limit this.

[0055] Furthermore, in some embodiments, the waste heat collection device 5 also includes a waste heat circulation water pump 56 , which is disposed upstream of the collection component 51 and is used to transport water from the waste heat circulation water return pipe 2122 to the collection component 51 .

[0056] See also Figure 2 and Figure 3 In some embodiments, the integrated energy utilization system for heat, electricity and gas storage and supply further includes a gas storage device 6, which is connected to the compressor 31 and the turbine 41. The gas storage device 6 is an above-ground gas storage tank.

[0057] It should be noted that the compressed air source of the compressor 31 includes the intermediate air extraction of the compressor 31, the exhaust of the turbine 41, and the reduced pressure air supply of the air storage device 6.

[0058] In this way, the air storage device 6 can store and release air according to different working conditions, so as to improve the comprehensive energy utilization efficiency and energy supply flexibility of the compressed air energy storage device 3 and the air turbine power generation device 4 under different working conditions.

[0059] It is understandable that the compressed gas may also be carbon dioxide gas and is not limited to air, which will not be elaborated here; the gas storage device 6 may also be an artificial chamber, a salt cave, an abandoned mine cave, etc.

[0060] See also Figure 2 and Figure 3 In some embodiments, the output end of the gas storage device 6 is connected to a pressure reducing valve 61, and the pressure range of the output end of the pressure reducing valve 61 is 0.5MPa-0.7MPa. Furthermore, the compressor 31 and the turbine 41 are connected to the compressed air network (not shown in the figure) through pipelines, and the second stage exhaust pressure range of the compressor 31, the final stage exhaust pressure range of the turbine 41, and the input end pressure range of the compressed air network are all 0.5MPa-0.7MPa.

[0061] In this way, the pressure reducing valve 61 can control the safety and reliability of the compressed air output by the air storage device 6, and can adjust the pressure of the compressed air output by the air storage device 6 according to different working conditions, thereby making the energy supply more flexible.

[0062] It is understandable that the air pressure range at the output end of the pressure reducing valve 61 and the air pressure range at the input end of the compressed air network can be flexibly adjusted according to actual needs, and no further details are given here.

[0063] See also Figure 3 In some embodiments, the air turbine power generation device 4 also includes a steam circulation component 44 and a valley power heat storage heat exchanger 45. The valley power heat storage heat exchanger 45 is arranged between the power generation cold water tank 42 and the power generation hot water tank 43. The steam circulation component 44 is connected to the valley power heat storage heat exchanger 45 and the power plant unit, and is used to transfer the heat in the steam output by the power plant unit to the valley power heat storage heat exchanger 45.

[0064] In this embodiment, the steam circulation component 44 includes a steam input pipe 441 and a condensate output pipe 442, and the steam input pipe 441 and the condensate output pipe 442 are both connected to the valley power storage heat exchanger 45, so that the surplus medium-pressure industrial steam when the boiler of the power plant unit is running at the minimum load can enter the valley power storage heat exchanger 45 through the steam input pipe 441, heat the circulating water in the air turbine power generation device 4 and store it in the power generation hot water tank 43, and the condensate after heat exchange is returned to the power plant unit through the condensate output pipe 442.

[0065] In this way, during the off-season valley hours, the excess medium-pressure steam in the power plant unit can be used as a heat source for the air turbine generator 4, and the heat can be transferred to the circulating water inside the air turbine generator 4, so that the heat of the medium-pressure steam can be stored in the power generation hot water tank 43. During the off-season peak hours, the heat in the power generation hot water tank 43 can be released and heat the compressed air entering the turbine 41, driving the turbine 41 to do work. After the work, the compressed air enters the compressed air pipeline network to supply air to the outside according to the user's gas pressure, and the circulating water after releasing the heat enters the power generation cold water tank 42 for storage.

[0066] It is understandable that the steam input through the steam input pipe 441 can also be high-pressure steam, which is not limited in this embodiment; by designing the final exhaust pressure of the turbine 41 to be close to the atmospheric pressure, the exhaust gas can also be discharged into the atmosphere, which is not limited in this embodiment.

[0067] In some embodiments, the operation method of the integrated energy utilization system for heat, electricity and gas storage and supply is as follows:

[0068] During the heating season, the heat carried by the boiler sewage, cold slag drainage, desulfurization slurry, and turbine exhaust steam of the power plant units are respectively exchanged with the corresponding waste heat exchangers 511, and the amount of hot water entering the waste heat circulation water supply pipeline 2121 is adjusted by the waste heat regulating valve 512, so that the first heat pump unit 21 heats the heat network return water in the first path 11; the heat carried by the turbine exhaust steam of the power plant units enters the second heat pump unit 22 to heat the heat network return water in the second path 12; the heat network extraction steam of the power plant turbine unit is used as power steam, which can increase the circulating water waste heat and exhaust steam waste heat of the power plant units to medium-grade thermal energy, and heat the heat network return water.

[0069] During the off-peak period of the heating season, the heat generated by each stage of the compressor 31 and the waste heat of the exhaust gas are used to further increase the temperature of the return water from the heating network.

[0070] During the off-peak hours in the non-heating season, the compression heat energy generated by the compressor 31 during the air compression process is stored in the energy storage hot water tank 33 and the energy storage cold water tank 32. At the same time, during this period, the power plant units perform peak load regulation, so that the surplus medium-pressure industrial steam from the boiler of the power plant units at the lowest load enters the air turbine generator 4, and the heat energy carried by the medium-pressure industrial steam is stored in the power generation hot water tank 43.

[0071] During the off-heating season peak electricity period, the steam turbine of the power plant unit and the turbine 41 of the air turbine generator 4 generate electricity, and the heat in the power generation hot water tank 43 is released and used as supplementary heat for the air turbine power generation, driving the turbine 41 to generate electricity; and the waste heat from the exhaust of the compressor 31 can be transported to the off-heating season condensate heater 36, so that it heats the condensate of the power plant unit, reduces the steam extraction of the steam turbine, and improves the thermal efficiency of the system cycle.

[0072] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A comprehensive energy utilization system for heat, electricity and gas storage and supply, characterized in that: include: A heating network return water pipeline (1), wherein the heating network return water pipeline (1) is connected to the heating network; A waste heat utilization device (2), the waste heat utilization device (2) comprising a first heat pump unit (21) and a second heat pump unit (22), the first heat pump unit (21) comprising a first heat pump body (211) and a first waste heat circulation pipeline (212), the first waste heat circulation pipeline (212) being connected to the first heat pump body (211) and a power plant unit, the second heat pump unit (22) comprising a second heat pump body (221) and a second waste heat circulation pipeline (222), the second waste heat circulation pipeline (222) being connected to the second heat pump body (221) and the power plant unit, the heat network return water pipeline (1) comprising a first path (11) and a second path (12), the first heat pump unit (21) being connected to the first path (11), the second heat pump unit (22) being connected to the second path (12), so as to increase the temperature of the medium in the first path (11) and the second path (12); A compressed air energy storage device (3) and an air turbine power generation device (4), wherein the compressed air energy storage device (3) is connected to the waste heat utilization device (2) and the air turbine power generation device (4), the compressed air energy storage device (3) includes a compressor (31), and the air turbine power generation device (4) includes a turbine (41).

2. The integrated energy utilization system for heat, electricity and gas storage and supply according to claim 1 is characterized in that: The compressed air energy storage device (3) further comprises an energy storage cold water tank (32) and an energy storage hot water tank (33); the energy storage cold water tank (32) is connected to the compressor (31) and the energy storage hot water tank (33); the energy storage hot water tank (33) is connected to the power plant unit, the heat network, and the compressor (31); the air turbine power generation device (4) further comprises an electric power generation cold water tank (42) and an electric power generation hot water tank (43); the electric power generation cold water tank (42) is connected to the turbine (41) and the electric power generation hot water tank (43); the electric power generation hot water tank (43) is connected to the power plant unit and the turbine (41).

3. The integrated energy utilization system for heat, electricity and gas storage and supply according to claim 2 is characterized in that: The compressed air energy storage device (3) further comprises an energy storage cold water tank bypass (34) and an energy storage hot water tank bypass (35); the energy storage cold water tank bypass (34) is connected in parallel with the energy storage cold water tank (32); and the energy storage hot water tank bypass (35) is connected in parallel with the energy storage hot water tank (33).

4. The integrated energy utilization system for heat, electricity and gas storage and supply according to claim 2 is characterized in that: The compressed air energy storage device (3) further comprises a non-heating season condensate water heater (36) and a heating season heat exchanger (37); the non-heating season condensate water heater (36) is arranged between the energy storage hot water tank (33) and the energy storage cold water tank (32); the non-heating season condensate water heater (36) is connected to the power plant unit to increase the temperature of condensate water; the heating season heat exchanger (37) is arranged between the energy storage hot water tank (33) and the energy storage cold water tank (32); the heating season heat exchanger (37) is connected to the heat network.

5. The comprehensive energy utilization system for heat, electricity and gas storage and supply according to claim 1 is characterized in that: The comprehensive energy utilization system for heat, electricity and gas storage and supply also includes a waste heat collection device (5), the waste heat collection device (5) includes a collection component (51), the collection component (51) includes a waste heat heat exchanger (511) and a waste heat regulating valve (512), the waste heat exchanger (511) is connected to the waste heat regulating valve (512), the collection component (51) is connected to the power plant unit, the first waste heat circulation pipeline (212) includes a waste heat circulation water supply pipeline (2121) and a waste heat circulation return water pipeline (2122), the collection component (51) is arranged between the waste heat circulation return water pipeline (2122) and the waste heat circulation water supply pipeline (2121), and the waste heat circulation return water pipeline (2122) and the waste heat circulation water supply pipeline (2121) are both connected to the first heat pump body (211).

6. The integrated energy utilization system for heat, electricity and gas storage and supply according to claim 5 is characterized in that: The waste heat collection device (5) also includes a boiler sewage pipe (52), a cold slag drainage pipe (53), a desulfurization slurry pipe (54) and other waste heat pipes (55), and four collection components (51) are provided, and the four collection components (51) are respectively connected to the boiler sewage pipe (52), the cold slag drainage pipe (53), the desulfurization slurry pipe (54) and the other waste heat pipes (55).

7. The integrated energy utilization system for heat, electricity and gas storage and supply according to claim 1 is characterized in that: The comprehensive energy utilization system for storage and supply of heat, electricity and gas also includes a gas storage device (6), and the gas storage device (6) is connected to the compressor (31) and the turbine (41).

8. The integrated energy utilization system for heat, electricity and gas storage and supply according to claim 7 is characterized in that: The output end of the gas storage device (6) is connected to a pressure reducing valve (61).

9. The integrated energy utilization system for heat, electricity and gas storage and supply according to claim 2 is characterized in that: The air turbine power generation device (4) further comprises a steam cycle component (44) and a valley power heat storage heat exchanger (45); the valley power heat storage heat exchanger (45) is arranged between the power generation cold water tank (42) and the power generation hot water tank (43); the steam cycle component (44) is connected to the valley power heat storage heat exchanger (45) and the power plant unit, and is used to transfer the heat in the steam output by the power plant unit to the valley power heat storage heat exchanger (45).

10. The comprehensive energy utilization system for heat, electricity and gas storage and supply according to any one of claims 1 to 9, characterized in that: The waste heat utilization device (2) further comprises a first regulating valve (23) and a second regulating valve (24); the first regulating valve (23) is arranged on the first path (11), and the second regulating valve (24) is arranged on the second path (12).

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