CN103629857B - Based on the thermal power cogeneration central heating system of heat pump - Google Patents
Based on the thermal power cogeneration central heating system of heat pump Download PDFInfo
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- CN103629857B CN103629857B CN201310655660.9A CN201310655660A CN103629857B CN 103629857 B CN103629857 B CN 103629857B CN 201310655660 A CN201310655660 A CN 201310655660A CN 103629857 B CN103629857 B CN 103629857B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
Abstract
Based on a thermal power cogeneration central heating system for heat pump, by introducing absorption heat exchange unit, multistage electric drive heat pump, repeatedly carry out using with power source and heat exchange to thermal source, improve the utilization ratio of steam source, is better user's heat supply; Introduce solar thermal collector, utilize this clean energy resource of solar energy to heat up to a secondary net backwater, energy-conserving and environment-protective; Heat exchanger is added in addition in steam power plant, a secondary net backwater water temperature is promoted with the low-grade heat source in condensing engine, introducing steam double-effect absorption heat pump, steam single-effective absorption heat pump, steam large temperature difference absorption heat pump, vapor-water heat exchanger reclaim low-grade heat step by step simultaneously, effectively make use of the exhaust steam in steam turbine, improve efficiency of energy utilization.Native system provides power plants generating electricity efficiency more than 30%.
Description
Technical field
The invention belongs to thermoelectricity co-generating heat supplying field, particularly relate to a kind of thermal power cogeneration central heating system based on heat pump.
Background technology
In recent years along with the increasing of the increase of China's urban heat supplying area and industrial premises, building of production line, China's heating power consumption figure is increased fast.Analyze from heat-supplying mode, current China resident heating mainly contains following several mode: cogeneration of heat and power mode, middle-size and small-size district boiler room central heating, household small-size gas water-heating furnace, family's coal furnace etc.Wherein cogeneration of heat and power mode is after the high-grade heat energy power-generating utilizing fuel, by the technology of the comprehensive energy utilization of its low grade heat energy heat supply.The average generating efficiency of current China 3,000,000 kilowatts of firepower electrical plants is 33%, and during steam power plant's heat supply, generating efficiency can reach 20%, and in 80% remaining heat more than 70% can be used for heat supply.The fuel of 10000 kilojoule heats, adopts cogeneration of heat and power mode, can produce 2000 kilojoule electric power and 7000 kilojoule heats.And adopting common thermal power plant to generate electricity, this 2000 kilojoule electric power need consume 6000 kilojoule fuel.Therefore, the electric power of cogeneration of heat and power mode output is deducted its fuel consumption according to the generating efficiency of common power plant, remaining 4000 kilojoule fuel can produce 7000 kilojoule heats.In this sense, then the efficiency of steam power plant's heat supply is 170%, is about 2 times of medium small boiler room heating efficiency.Therefore, when conditions permit, the heating system of cogeneration of heat and power should be first developed.However, in cogeneration of heat and power mode for hankering or there are some problems, such as: exhaust steam in steam turbine directly enters cooling tower and wastes a large amount of energy, a large amount of latent heat of vaporization is not fully used.Steam simultaneously needed for heat supply greatly reduces generating efficiency etc.
Summary of the invention
For problems such as a large amount of latent heats of vaporization in exhaust steam in steam turbine can not be fully utilized, the invention provides a kind of thermal power cogeneration central heating system based on heat pump.
The technical scheme that the present invention adopts for technical solution problem is:
In steam power plant, in steam turbine, a part of high-temperature steam drives electrical power generators, another part high-temperature steam is input to steam double-effect absorption heat pump, steam single-effective absorption heat pump, the large temperature difference absorption heat pump of steam, vapor-water heat exchanger respectively, and the power source as absorption type heat pump assembly at different levels participates in heat exchange;
Weary gas in steam turbine enters into condensing engine, wherein a part of heat exchange is that the hot water of 40 DEG C to be input to a secondary net backwater heat exchange of 15 DEG C in heat exchanger is 25 DEG C, another part accesses steam double-effect absorption heat pump, steam single-effective absorption heat pump, the large temperature difference absorption heat pump of steam in parallel, as the low-temperature heat source of absorption type heat pump assembly at different levels, return after heat exchange in condensing engine; 25 DEG C of hot water enters steam double-effect absorption heat pump successively, steam single-effective absorption heat pump, the large temperature difference absorption heat pump of steam are heated to 55 DEG C, 70 DEG C, 90 DEG C respectively, finally enter vapor-water heat exchanger and steam heat-exchanging temperature is increased to 110 DEG C, supplying water as a secondary net is input to absorption heat exchange unit;
In heat exchange station, one secondary net of 110 DEG C supplies water input absorption heat exchange unit as power source, the low-temperature heat source as this absorption heat exchange unit is continued after acting cooling, 25 DEG C are reduced to as temperature after low-temperature heat source heat exchange, this hot water of 25 DEG C is input to the vaporizer side in multistage electric drive heat pump as low-temperature heat source again to make condenser side provide the hot water heating of 60 DEG C for user, be input in solar thermal collector from a secondary net backwater of 5 DEG C of the vaporizer side discharge multistage electric drive heat pump and a secondary net return water temperature is heated to 15 DEG C, then entered in steam power plant's system by heat exchanger.
Absorption heat pump at different levels and vapor-water heat exchanger all adopt the steam turbine of about 0.3MPa to heat and to draw gas driving.
The invention has the beneficial effects as follows:
Introduce absorption heat exchange unit, multistage electric drive heat pump, repeatedly carry out using with power source and heat exchange to thermal source, improve the utilization ratio of steam source, is better user's heat supply;
Introduce solar thermal collector, utilize this clean energy resource of solar energy to heat up to a secondary net backwater, energy-conserving and environment-protective;
Heat exchanger is added in addition in steam power plant, a secondary net backwater water temperature is promoted with the low-grade heat source in condensing engine, introducing steam double-effect absorption heat pump, steam single-effective absorption heat pump, steam large temperature difference absorption heat pump, vapor-water heat exchanger reclaim low-grade heat step by step simultaneously, effectively make use of the exhaust steam in steam turbine, improve efficiency of energy utilization.
Native system provides power plants generating electricity efficiency more than 30%.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention.
In figure: 1. steam turbine, 2. generator, 3. condensing engine, 4. cooling tower, 5. heat exchanger, 6. steam double-effect absorption heat pump, 7. steam single-effective absorption heat pump, 8. the large temperature difference absorption heat pump of steam, 9. vapor-water heat exchanger, 10. absorption heat exchange unit, 11. multistage electric drive heat pumps, 12. solar thermal collectors, 13. users
Detailed description of the invention
In steam power plant, in steam turbine 1, a part of high-temperature gas drives generator 2 to generate electricity, another part high-temperature steam is input to steam double-effect absorption heat pump 6, steam single-effective absorption heat pump 7, the large temperature difference absorption heat pump 8 of steam, vapor-water heat exchanger 9 respectively, and the power source as absorption type heat pump assembly at different levels participates in heat exchange;
Weary gas in steam turbine 1 enters into condensing engine 3, wherein a part of heat exchange is that the hot water of 40 DEG C to be input to a secondary net backwater heat exchange of 15 DEG C in heat exchanger 5 is 25 DEG C, another part accesses steam double-effect absorption heat pump 6, steam single-effective absorption heat pump 7, the large temperature difference absorption heat pump 8 of steam in parallel, as the low-temperature heat source of absorption type heat pump assembly at different levels, return in condensing engine 3 after heat exchange; 25 DEG C of hot water enters steam double-effect absorption heat pump 6 successively, steam single-effective absorption heat pump 7, the large temperature difference absorption heat pump 8 of steam are heated to 55 DEG C, 70 DEG C, 90 DEG C respectively, finally enter vapor-water heat exchanger 9 and be increased to 110 DEG C with steam heat-exchanging temperature, supplying water as a secondary net is input to absorption heat exchange unit 10;
In heat exchange station, one secondary net of 110 DEG C supplies water input absorption heat exchange unit 10 as power source, the low-temperature heat source as this absorption heat exchange unit 10 is continued after acting cooling, 25 DEG C are reduced to as temperature after low-temperature heat source heat exchange, this hot water of 25 DEG C is input to the vaporizer side in multistage electric drive heat pump 11 as low-temperature heat source again to make condenser side provide the hot water heating of 60 DEG C for user, be input in solar thermal collector 12 from a secondary net backwater of 5 DEG C of the vaporizer side discharge multistage electric drive heat pump 11 and a secondary net return water temperature is heated to 15 DEG C, then entered in steam power plant's system by heat exchanger 5.
Absorption heat pump at different levels and vapor-water heat exchanger all adopt the steam turbine of about 0.3MPa to heat and to draw gas driving.
The present invention is not limited to the present embodiment, any the present invention disclose technical scope in equivalent concepts or change, be all classified as protection scope of the present invention.
Claims (1)
1., based on a thermal power cogeneration central heating system for heat pump, it is characterized in that:
In steam power plant, in steam turbine (1), a part of high-temperature steam drives generator (2) generating, another part high-temperature steam is input to steam double-effect absorption heat pump (6), steam single-effective absorption heat pump (7), the large temperature difference absorption heat pump (8) of steam, vapor-water heat exchanger (9) respectively, and the power source as absorption type heat pump assembly at different levels participates in heat exchange;
Weary gas in steam turbine (1) enters into condensing engine (3), wherein a part of heat exchange is that the hot water of 40 DEG C to be input to a secondary net backwater heat exchange of 15 DEG C in heat exchanger (5) is 25 DEG C, another part accesses steam double-effect absorption heat pump (6), steam single-effective absorption heat pump (7), the large temperature difference absorption heat pump (8) of steam in parallel, as the low-temperature heat source of absorption type heat pump assembly at different levels, return in condensing engine (3) after heat exchange; 25 DEG C of hot water enters steam double-effect absorption heat pump (6) successively, steam single-effective absorption heat pump (7), the large temperature difference absorption heat pump (8) of steam are heated to 55 DEG C, 70 DEG C, 90 DEG C respectively, finally enter vapor-water heat exchanger (9) and be increased to 110 DEG C with steam heat-exchanging temperature, supplying water as a secondary net is input to absorption heat exchange unit (10);
In heat exchange station, one secondary net of 110 DEG C supplies water input absorption heat exchange unit (10) as power source, the low-temperature heat source as this absorption heat exchange unit (10) is continued after acting cooling, 25 DEG C are reduced to as temperature after low-temperature heat source heat exchange, this hot water of 25 DEG C is input to the vaporizer side in multistage electric drive heat pump (11) as low-temperature heat source again to make condenser side provide the hot water heating of 60 DEG C for user, be input in solar thermal collector (12) from a secondary net backwater of 5 DEG C of the vaporizer side discharge multistage electric drive heat pump (11) and a secondary net return water temperature is heated to 15 DEG C, then entered in steam power plant's system by heat exchanger (5).
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| CN201310655660.9A CN103629857B (en) | 2013-12-04 | 2013-12-04 | Based on the thermal power cogeneration central heating system of heat pump |
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