CN216788505U - Natural gas combined cooling heating and power energy system with phase-change heat storage device - Google Patents
Natural gas combined cooling heating and power energy system with phase-change heat storage device Download PDFInfo
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- CN216788505U CN216788505U CN202220244483.XU CN202220244483U CN216788505U CN 216788505 U CN216788505 U CN 216788505U CN 202220244483 U CN202220244483 U CN 202220244483U CN 216788505 U CN216788505 U CN 216788505U
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Abstract
The utility model discloses a natural gas combined cooling heating and power energy supply system with a phase change heat storage device, which comprises a gas power generation subsystem, wherein a flue gas discharge pipeline of the gas power generation subsystem is connected with a waste heat power generation subsystem; cooling water pipelines of the gas power generation subsystem are respectively communicated to the heat supply subsystem, the refrigeration subsystem and the heat storage subsystem; waste heat steam pipelines of the waste heat power generation subsystem are respectively communicated to the heat supply subsystem, the refrigeration subsystem and the heat storage subsystem; the waste heat flue gas of the gas power generation subsystem provides a heat source for the waste heat power generation subsystem to carry out secondary power generation, the waste heat water of the gas power generation subsystem and the waste heat steam of the waste heat power generation subsystem are used as heat sources of the heat supply subsystem and the refrigeration subsystem, and meanwhile, the heat storage subsystem is additionally arranged to store heat and supply heat, so that the full utilization of natural gas energy is realized, and the energy waste is reduced.
Description
Technical Field
The utility model belongs to the technical field of natural gas functional systems, and particularly relates to a natural gas combined cooling heating and power energy supply system with a phase change heat storage device.
Background
Natural gas, which is a mixture of hydrocarbon and non-hydrocarbon gases naturally trapped in a subterranean formation, is one of the important energy sources. The natural gas is used as energy, so that the consumption of coal and petroleum can be reduced.
At present, natural gas is used as energy supply, and a gas water heater boiler is mainly used in central heating places such as part of markets, hotels, office buildings, hospitals, schools and the like in urban hot water supply, but the natural gas belongs to high-grade energy, and if the natural gas is directly combusted to supply low-grade hot water, great waste is inevitably generated.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a natural gas combined cooling heating and power energy system with a phase-change heat storage device, which is used for fully utilizing natural gas serving as high-grade energy and reducing energy waste.
The utility model adopts the following technical scheme: a natural gas combined cooling heating and power energy system with a phase-change heat storage device comprises a gas power generation subsystem, wherein a flue gas discharge pipeline of the gas power generation subsystem is connected with a waste heat power generation subsystem;
cooling water pipelines of the gas power generation subsystem are respectively communicated to the heat supply subsystem, the refrigeration subsystem and the heat storage subsystem;
waste heat steam pipelines of the waste heat power generation subsystem are respectively communicated to the heat supply subsystem, the refrigeration subsystem and the heat storage subsystem;
the gas power generation subsystem and the waste heat power generation subsystem are used for generating electric energy to meet the power load; the heat storage subsystem is used for recovering and storing the waste heat of the gas power generation subsystem and the waste heat power generation subsystem so as to supply heat and refrigerate in the shutdown period of the gas power generation subsystem and the waste heat power generation subsystem.
Further, the gas power generation subsystem comprises an internal combustion engine, the internal combustion engine is respectively connected with an air source and a natural gas source, the internal combustion engine comprises a gas turbine, the gas turbine is connected with a first generator, and the first generator is connected with a first power load.
Furthermore, the waste heat power generation subsystem comprises a waste heat boiler, a heat source inlet of the waste heat boiler is connected to a waste heat flue gas outlet of the internal combustion engine, a heat source outlet of the waste heat boiler is connected with a steam turbine, the steam turbine is connected with a second power generator, and the second power generator is connected with a second power load.
Furthermore, the heat supply subsystem comprises a heat exchanger, a heat source outlet of the heat exchanger is connected to the heat supply terminal, and a heat source inlet of the heat exchanger is respectively connected with the steam turbine, the internal combustion engine and the heat storage subsystem.
Further, the heat exchanger includes a steam heat exchanger and a hot water heat exchanger.
Furthermore, the refrigeration subsystem comprises an absorption type bromine refrigerator, and the absorption type bromine refrigerator is connected with a refrigeration terminal; the absorption type bromine cooling machine is also connected with the internal combustion engine, the steam turbine and the heat storage subsystem.
Further, the heat storage subsystem comprises a phase change heat storage device which is respectively connected with the heat exchanger and the absorption type bromine refrigerator;
the phase-change heat storage device is also respectively connected with the internal combustion engine and the steam turbine.
Further, the phase change heat storage device comprises a steam phase change heat storage device and a hot water phase change heat storage device.
Furthermore, the phase change heat storage device is also respectively connected with a circulating cooling water and a deaerator.
The other technical scheme of the utility model is as follows: the operation method of the natural gas combined cooling heating and power energy system with the phase-change heat storage device comprises the following steps of:
when the gas power generation subsystem and the waste heat power generation subsystem stop, waste heat of the gas power generation subsystem and the waste heat power generation subsystem stores heat for the phase change heat storage subsystem;
after the phase-change heat storage subsystem stores heat, the heat supply subsystem and the refrigeration subsystem are supplied with heat, and the deaerator of the waste heat power generation subsystem is supplied with heat before the waste heat power generation subsystem is started next time.
The beneficial effects of the utility model are: the waste heat flue gas of the gas power generation subsystem provides a heat source for the waste heat power generation subsystem to carry out secondary power generation, the waste heat water of the gas power generation subsystem and the waste heat steam of the waste heat power generation subsystem are used as heat sources of the heat supply subsystem and the refrigeration subsystem, and meanwhile, the heat storage subsystem is additionally arranged to carry out heat storage and heat supply, so that the natural gas energy is fully utilized, and the energy waste is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a natural gas combined cooling heating and power energy system with a phase change heat storage device according to an embodiment of the present invention.
Wherein: 10. a gas power generation subsystem; 11. an internal combustion engine; 12. a first generator; 13. a first electrical load; an air source; 15. a natural gas source;
20. a waste heat power generation subsystem; 21. a waste heat boiler; 22. a steam turbine; 23. a second generator; 24. a second electrical load;
30. a heating subsystem; 31. a heat exchanger; 32. a heat supply terminal;
40. a refrigeration subsystem; 41. an absorption type bromine refrigerator; 42. a refrigeration terminal;
50. a heat storage subsystem; 51. circulating cooling water; 52. a phase change heat storage device; 53. a deoxygenated water supply pump; 54. a deaerator.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
At present, most centralized power supply systems only adopt single energy, are limited by a plurality of factors, and once the centralized power supply systems fail and are not replaced, the energy system is paralyzed, and the output safety and the stability are poor. The distributed energy system is arranged at a user side, can be used as a supplementary power supply of a large power grid, can be used for emergency when an accident occurs, and is high in flexibility and reliability of preferentially supplying power and energy to important users.
The natural gas combined cooling heating and power technology provided by the embodiment of the utility model utilizes natural gas to burn and apply work to generate high-grade electric energy, and then the low-grade heat energy discharged by power generation equipment is fully used for heating and refrigeration, so that the energy gradient utilization is realized, and the natural gas combined cooling heating and power technology is an efficient energy utilization system and is a new way for supplying cooling, heating and power to public buildings.
However, a common energy system is usually operated in a market, a hotel, an office building, a hospital or a school and the like in stages, and is mostly operated in the daytime, and is in a shutdown state without load at night, and after a front-end device is shut down, a rear-end energy is usually wasted due to a lag reason. The phase change energy storage device is introduced to store the part of heat, and the part of heat can be continuously utilized when the device is turned off at night.
The embodiment of the utility model discloses a natural gas combined cooling heating and power energy system with a phase change heat storage device, which comprises a gas power generation subsystem 10, wherein a flue gas discharge pipeline of the gas power generation subsystem 10 is connected with a waste heat power generation subsystem 20; cooling water pipelines of the gas power generation subsystem 10 are respectively communicated to the heat supply subsystem 30, the refrigeration subsystem 40 and the heat storage subsystem 50; the waste heat steam pipeline of the waste heat power generation subsystem 20 is respectively communicated to the heat supply subsystem 30, the refrigeration subsystem 40 and the heat storage subsystem 50; the gas power generation subsystem 10 and the waste heat power generation subsystem 20 are used for generating electric energy to meet the power load; the heat storage subsystem 50 is used for recovering and storing the waste heat of the gas power generation subsystem 10 and the waste heat power generation subsystem 20 so as to supply heat and refrigerate in the shutdown period of the gas power generation subsystem 10 and the waste heat power generation subsystem 20.
According to the utility model, the waste heat flue gas of the gas power generation subsystem 10 is used for providing a heat source for the waste heat power generation subsystem 20 to carry out secondary power generation, the waste heat water of the gas power generation subsystem 10 and the waste heat steam of the waste heat power generation subsystem 20 are used as heat sources of the heat supply subsystem 30 and the refrigeration subsystem 40, and meanwhile, the heat storage subsystem 50 is additionally arranged to carry out heat storage and heat supply, so that the full utilization of natural gas energy is realized, and the energy waste is reduced.
In one embodiment, the gas power subsystem 10 includes an internal combustion engine 11, the internal combustion engine 11 is connected to an air source 14 and a natural gas source 15, respectively, the internal combustion engine 11 includes a gas turbine, the gas turbine is connected to a first generator 12, and the first generator 12 is connected to a first electrical load 13. Specifically, natural gas and air are input into the internal combustion engine 11 and are combusted in the internal combustion engine 11, the gas turbine of the internal combustion engine 11 converts thermal energy into mechanical energy, and the internal combustion engine 11 is connected with a first generator to supply power to a first electric load 13.
In addition, the exhaust-heat flue gas of the internal combustion engine 11 enters the exhaust-heat boiler 21 for heat exchange, the hot water is converted into high-temperature high-pressure steam, the internal energy is converted into mechanical energy under the action of the steam turbine 22, the steam turbine 22 is connected with the second generator 23 to supply power to the second power load 24, and the first power load 13 and the second power load 24 may be the same or different. Moreover, a cylinder liner water pipeline in the internal combustion engine 11 is connected with the heat exchanger 31, and hot water is generated after heat exchange with the heat exchanger 31; and the other path of cylinder liner water is connected with an absorption type bromine cooler 41 through a branch pipe and exchanges heat with the absorption type bromine cooler 41 to refrigerate.
In an embodiment of the present invention, another branch of the cylinder liner water in the internal combustion engine 11 is connected to the phase change heat storage device 52 to perform heat charging of the phase change heat storage device 52, so as to ensure that the cylinder liner water heat source is not wasted after the internal combustion engine 11 is stopped, and improve the energy utilization rate.
In one embodiment, the cogeneration subsystem 20 comprises a cogeneration boiler 21, a heat source inlet of the cogeneration boiler 21 is connected to a waste heat flue gas outlet of the internal combustion engine 11, a heat source outlet of the cogeneration boiler 21 is connected to a steam turbine 22, the steam turbine 22 is connected to a second generator 23, and the second generator 23 is connected to a second electrical load 24. Specifically, the outlet pipeline of the steam turbine 22 is connected with the heat exchanger 31, and hot water is generated after heat exchange with the heat exchanger 31 to supply heat to the heat supply terminal 32. The outlet pipe of the steam turbine 22 is connected to the absorption bromine refrigerator 41, and performs heat exchange with the absorption bromine refrigerator 41 to perform cooling. The outlet pipeline of the steam turbine 22 is also connected with the phase-change heat storage device 51 to charge the phase-change heat storage device 51, and the steam heat source of the steam turbine 22 can be effectively utilized after the steam turbine is stopped.
In one embodiment, the heating subsystem 30 includes a heat exchanger 31, a heat source outlet of the heat exchanger 31 is connected to the heating terminal 32, and a heat source inlet of the heat exchanger 31 is connected to the steam turbine 22, the internal combustion engine 11, and the heat storage subsystem 50, respectively. Specifically, the heat exchanger 31 includes a steam heat exchanger and a hot water heat exchanger, so that the liner water of the internal combustion engine 11 and the waste heat steam of the steam turbine 22 can be utilized.
In one embodiment, the refrigeration subsystem 40 includes an absorption bromine chiller 41, the absorption bromine chiller 41 is connected to a refrigeration terminal 42; the absorption bromine refrigerator 41 is also connected to the internal combustion engine 11, the steam turbine 22 and the heat storage subsystem 50. Specifically, the absorption-type bromine refrigerator 41 is a combined absorption-type bromine refrigerator device of a vapor absorption-type bromine refrigerator device and a hot water absorption-type bromine refrigerator device.
In one embodiment, the heat storage subsystem 50 comprises a phase change heat storage device 52, and the phase change heat storage device 52 is respectively connected with the heat exchanger 31 and the absorption bromine refrigerator 41 to realize heat supply and refrigeration of the system when the internal combustion gas 11 and the waste heat boiler 21 are not started. The phase-change heat storage device 52 is also connected with the internal combustion engine 11 and the steam turbine 22 respectively to realize effective recycling of cylinder liner water and steam. In addition, since the phase change heat storage device 52 needs to absorb water heat and steam heat, it includes a steam phase change heat storage device and a hot water phase change heat storage device.
In the embodiment of the present invention, the phase change heat storage device 52 is further connected to the circulating cooling water 51 and the deaerator 54, respectively, so as to be fully ready for starting before the start of the waste heat boiler 21. In addition, in order to increase the system pressure, a feed water pump 53 is added between the deaerator 54 and the phase change heat storage device 52.
The utility model also discloses an operation method of the natural gas combined cooling heating and power energy system with the phase-change heat storage device, and the natural gas combined cooling heating and power energy system with the phase-change heat storage device comprises the following steps: when the gas power generation subsystem 10 and the waste heat power generation subsystem 20 are shut down, the waste heat of the gas power generation subsystem 10 and the waste heat power generation subsystem 20 stores heat for the phase change heat storage subsystem 50; after the phase change heat storage subsystem 50 stores heat, heat is supplied to the heating subsystem 30 and the refrigeration subsystem 40, and heat is supplied to the deaerator 54 of the cogeneration subsystem 20 before the cogeneration subsystem 20 is started next time.
Specifically, during normal operation in daytime, the power supply system enters the internal combustion engine 11 from the natural gas source 15 and the air source 14 for combustion, the gas turbine in the internal combustion engine 11 converts heat energy into mechanical energy and drives the first generator 12 to supply power, and on the other hand, the waste heat flue gas of the internal combustion engine 11 enters the waste heat boiler 21 for heat exchange, so that hot water is converted into high-temperature high-pressure steam, and the internal energy is converted into mechanical energy under the action of the steam turbine 22 to drive the second generator 23 to supply power. The hot water subsystem 30 supplies cylinder jacket water mainly subjected to heat exchange by the internal combustion engine 11 to generate hot water through heat exchange of the heat exchanger 31, when the hot water is not supplied enough, the condensed steam passing through the steam turbine 22 can exchange heat through the heat exchanger 31 to supply the hot water, and when the cylinder jacket water is enough, part of the cylinder jacket water can flow into the phase-change heat storage device 52 to perform phase-change heat charging. Similarly, the refrigeration subsystem 40 supplies cylinder jacket water mainly subjected to heat exchange by the internal combustion engine 11 to perform refrigeration through heat exchange by the absorption type bromine refrigerator 41, and when the refrigeration supply is insufficient, can perform refrigeration through heat exchange by condensed steam after passing through the steam turbine 22 by the absorption type bromine refrigerator 41.
More specifically, in the shutdown process of the system, the waste heat of the cylinder liner water can flow into the phase change heat storage device 52, the phase change heat storage device 52 can be charged with heat, after the shutdown, the high-temperature high-pressure steam is reduced into the condensed steam through the steam turbine 22 and does not need to be recycled, therefore, the directly condensed steam is introduced into the phase change heat storage device 52 for phase change heat charging, after the shutdown at night, because the heat consumption of the user is less, at the moment, the heat consumption can be provided by the phase change heat storage device 52, and the specific realization path is that the circulating cooling water 51 serving as the make-up water exchanges heat through the phase change heat storage device 52, and respectively generates hot water through the heat exchanger 31 or refrigerates through the absorption type bromine refrigerator 41. Because the heat and the cold are less used at night, if the heat in the phase-change heat storage device 52 is enough, part of the heat can be supplied to the deaerator 54 through the deaerating water feeding pump 53 for use when the machine is started on the next day, and because the machine is in a valley power state (low cost) at night, municipal power supply can be directly adopted for power supply.
By using the system and the method, the natural gas can be utilized to burn and apply work to generate high-grade electric energy, and then the low-grade heat energy discharged by the power generation equipment is fully used for heating and refrigeration, so that the energy gradient utilization is realized. Meanwhile, the phase change heat storage device is adopted, so that waste heat recovery can be realized when the machine is turned off, heat supply or refrigeration can be continued at night, or hot water can be supplied to a deaerator for use next day.
Claims (9)
1. A natural gas combined cooling heating and power energy supply system with a phase-change heat storage device is characterized by comprising a gas power generation subsystem (10), wherein a flue gas discharge pipeline of the gas power generation subsystem (10) is connected with a waste heat power generation subsystem (20);
cooling water pipelines of the gas power generation subsystem (10) are respectively communicated to the heat supply subsystem (30), the refrigeration subsystem (40) and the heat storage subsystem (50);
waste heat steam pipelines of the waste heat power generation subsystem (20) are respectively communicated to the heat supply subsystem (30), the refrigeration subsystem (40) and the heat storage subsystem (50);
the gas power generation subsystem (10) and the waste heat power generation subsystem (20) are used for generating electric energy to meet the power load; the heat storage subsystem (50) is used for recovering and storing the waste heat of the gas power generation subsystem (10) and the waste heat power generation subsystem (20) so as to supply heat and refrigerate in the shutdown period of the gas power generation subsystem (10) and the waste heat power generation subsystem (20).
2. The natural gas combined cooling heating and power energy system with the phase-change heat storage device as claimed in claim 1, wherein the gas power generation subsystem (10) comprises an internal combustion engine (11), the internal combustion engine (11) is connected with an air source (14) and a natural gas source (15) respectively, the internal combustion engine (11) comprises a gas turbine, the gas turbine is connected with a first power generator (12), and the first power generator (12) is connected with a first power load (13).
3. The natural gas combined cooling heating and power energy system with the phase-change heat storage device as claimed in claim 2, wherein the cogeneration subsystem (20) comprises a waste heat boiler (21), a heat source inlet of the waste heat boiler (21) is connected to a waste heat flue gas outlet of the internal combustion engine (11), a heat source outlet of the waste heat boiler (21) is connected to a steam turbine (22), the steam turbine (22) is connected to a second generator (23), and the second generator (23) is connected to a second power load (24).
4. The natural gas combined cooling heating and power energy system with the phase-change heat storage device as claimed in claim 3, wherein the heat supply subsystem (30) comprises a heat exchanger (31), a heat source outlet of the heat exchanger (31) is connected to a heat supply terminal (32), and a heat source inlet of the heat exchanger (31) is respectively connected to the steam turbine (22), the internal combustion engine (11) and the heat storage subsystem (50).
5. The natural gas combined cooling heating and power energy system with the phase-change heat storage device as claimed in claim 4, wherein the heat exchanger (31) comprises a steam heat exchanger and a hot water heat exchanger.
6. The natural gas combined cooling heating and power energy system with the phase-change heat storage device as claimed in claim 4 or 5, wherein the refrigeration subsystem (40) comprises an absorption bromine refrigerator (41), and the absorption bromine refrigerator (41) is connected with a refrigeration terminal (42); the absorption type bromine cooling machine (41) is also connected with the internal combustion engine (11), the steam turbine (22) and the heat storage subsystem (50).
7. The natural gas combined cooling heating and power energy system with the phase-change heat storage device as claimed in claim 6, wherein the heat storage subsystem (50) comprises a phase-change heat storage device (52), and the phase-change heat storage device (52) is respectively connected with the heat exchanger (31) and the absorption bromine refrigerator (41);
the phase-change heat storage device (52) is also connected with the internal combustion engine (11) and the steam turbine (22) respectively.
8. The natural gas combined cooling heating and power energy system with the phase-change heat storage device as claimed in claim 7, wherein the phase-change heat storage device (52) comprises a steam phase-change heat storage device and a hot water phase-change heat storage device.
9. The natural gas combined cooling heating and power energy system with the phase-change heat storage device as claimed in claim 8, wherein the phase-change heat storage device (52) is further connected with a circulating cooling water (51) and a deaerator (54), respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220244483.XU CN216788505U (en) | 2022-01-27 | 2022-01-27 | Natural gas combined cooling heating and power energy system with phase-change heat storage device |
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| CN202220244483.XU CN216788505U (en) | 2022-01-27 | 2022-01-27 | Natural gas combined cooling heating and power energy system with phase-change heat storage device |
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