CN103628938A - System for greatly reducing cogeneration centralized heat supply temperature - Google Patents
System for greatly reducing cogeneration centralized heat supply temperature Download PDFInfo
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- CN103628938A CN103628938A CN201310643880.XA CN201310643880A CN103628938A CN 103628938 A CN103628938 A CN 103628938A CN 201310643880 A CN201310643880 A CN 201310643880A CN 103628938 A CN103628938 A CN 103628938A
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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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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
Abstract
The invention relates to a system for greatly reducing a cogeneration centralized heat supply temperature. An absorptive heat exchanging unit and a multistage electric-drive heat pump are used as a power source and for exchanging the heat with a heat source, so that the utilization efficiency of a steam heat source can be improved, and the heat can be better supplied to a user; and in addition, a condensing engine is introduced into a thermal power plant to recycle the low-grade heat source, a steam double-effect absorptive heat pump, a steam single-effect absorptive heat pump and a steam large-temperature-difference absorptive heat pump are also used for gradually recovering the low-grade heat, so that the dead steam in a steam turbine can be effectively utilized, and the utilization efficiency of the energy can be improved. By reducing the temperature of the water supplied by a primary network to 90DEG C, the heat supply steam extraction volume of the thermal power plant can be reduced, and the power generation capacity of the thermal power plant can be improved; the heat-preserving consumables can be saved and the heat loss of a heat supply pipeline can be reduced by reducing the temperature of the heat supply water.
Description
Technical field
The invention belongs to thermoelectricity co-generating heat supplying field, relate in particular to a kind of system that significantly reduces cogeneration of heat and power central heat supply temperature.
Background technique
In recent years, along with the increasing of the increase of China's urban heat supplying area and industrial premises, building of production line, made China's heating power consumption figure rapid growth.From heat-supplying mode, analyze, China resident heating at present mainly contains following several mode: cogeneration of heat and power mode, middle-size and small-size district boiler room central heat supply, household small-size gas water-heating furnace, family's coal stove etc.Wherein cogeneration of heat and power mode is to utilize after the high-grade heat energy power-generating of fuel, by the technology of the comprehensive utilization energy of its low grade heat energy heat supply.During the at present average generating efficiency Wei33%，Er thermoelectricity plant heat supply of 3,000,000 kilowatts of firepower electrical plants of China, generating efficiency can reach 20%, 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 the generating of common thermal power plant, this 2000 kilojoule electric power need consume 6000 kilojoule fuel.Therefore, the electric power of cogeneration of heat and power mode output is deducted to its fuel consumption according to the generating efficiency of common power plant, remaining 4000 kilojoule fuel can produce 7000 kilojoule heats.The efficiency of in this sense ，Ze thermoelectricity plant heat supply is 170%, is about 2 times of medium small boiler room heating efficiency.Therefore when conditions permit, should first develop the heating system of cogeneration of heat and power.However, in cogeneration of heat and power mode, for hankering or existing some problems, for example: exhaust steam in steam turbine directly enters cooling tower and wasted a large amount of energy, a large amount of latent heats of vaporization are not fully used.The required steam of heat supply simultaneously greatly reduces generating efficiency etc.In the steam heating pipeline of high temperature, need a large amount of thermal insulating materials to reduce the loss of heat on the other hand; In the situation that heating temperature is higher, although use more thermal insulating material can cause larger heat loss.
Summary of the invention
For the problem that can not be fully utilized of a large amount of latent heats of vaporization in exhaust steam in steam turbine, and the shortcoming of a large amount of heat losss in hot duct, the invention provides a kind of system that significantly reduces cogeneration of heat and power central heat supply temperature.
The present invention is that the technological scheme that technical solution problem adopts is:
In thermoelectricity plant, in steam turbine, a part of high-temperature steam drives generator generating, another part high-temperature steam is input to respectively steam double-effect absorption heat pump, steam single-effective absorption heat pump, the large temperature difference absorption heat pump of steam, as the power source participation heat exchange of absorption type heat pump assemblys at different levels;
Weary gas in steam turbine enters into condensing engine, wherein a part of heat exchange be that the hot water of 40 ℃ is input in heat exchanger is 25 ℃ by a secondary net backwater heat exchange of 5 ℃, 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 assemblys at different levels, after heat exchange, return in vapour condenser; 25 ℃ of hot water enters successively steam double-effect absorption heat pump, steam single-effective absorption heat pump, the large temperature difference absorption heat pump of steam and is heated to respectively 55 ℃, 70 ℃, 90 ℃, and the hot water of last 90 ℃ supplies water and is input to absorption heat exchange unit as a secondary net;
In heat exchange station, one secondary net of 90 ℃ supplies water input absorption heat exchange unit as power source, after acting cooling, continue the low-temperature heat source as this absorption heat exchange unit, as temperature after low-temperature heat source heat exchange, be reduced to 25 ℃, this hot water of 25 ℃ 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 ℃ for user, and the secondary net backwater of 5 ℃ that the vaporizer side from multistage electric drive heat pump is discharged is heated up after being 25 ℃ and entered in thermoelectricity plant's system by heat exchanger heat exchange.
Absorption heat pumps at different levels all adopt the steam turbine heating of the about 0.3MPa driving of drawing gas.
The invention has the beneficial effects as follows:
One secondary net supply water temperature is reduced to 90 ℃, has saved the heating amount of drawing gas of thermoelectricity plant, has increased the generating capacity of thermoelectricity plant; The reduction of the water temperature that simultaneously heats has been saved the consumption of thermal insulating material and has been reduced heat supply pipeline heat loss.
Introducing absorption heat exchange unit, multistage electric drive heat pump, repeatedly thermal source is carried out using with power source and heat exchange, improved the utilization ratio of steam source, is better user's heat supply;
In thermoelectricity plant, add in addition heat exchanger, with the low-grade heat source in condensing engine, promote a secondary net backwater water temperature, introduce steam double-effect absorption heat pump, steam single-effective absorption heat pump, the large temperature difference absorption heat pump of steam simultaneously, reclaim step by step low-grade heat, effectively utilize the exhaust steam in steam turbine, improved efficiency of energy utilization.
Native system provides power plant's generating 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, the 8. large temperature difference absorption heat pump of steam, 10. absorption heat exchange unit, 11. multistage electric drive heat pumps, 13. users
Embodiment
In thermoelectricity plant, in steam turbine 1, a part of high-temperature steam drives generator 2 generatings, another part high-temperature steam is input to respectively steam double-effect absorption heat pump 6, steam single-effective absorption heat pump 7, the large temperature difference absorption heat pump 8 of steam, as the power source participation heat exchange of absorption type heat pump assemblys at different levels;
Weary gas in steam turbine 1 enters into condensing engine 3, wherein a part of heat exchange be that the hot water of 40 ℃ is input in heat exchanger 5 is 25 ℃ by a secondary net backwater heat exchange of 15 ℃, 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 assemblys at different levels, after heat exchange, return in vapour condenser 3; 25 ℃ of hot water enters successively steam double-effect absorption heat pump 6, steam single-effective absorption heat pump 7, the large temperature difference absorption heat pump 8 of steam and is heated to respectively 55 ℃, 70 ℃, 90 ℃, and the hot water of last 90 ℃ supplies water and is input to absorption heat exchange unit 10 as a secondary net;
In heat exchange station, one secondary net of 90 ℃ supplies water input absorption heat exchange unit 10 as power source, after acting cooling, continue the low-temperature heat source as this absorption heat exchange unit 10, as temperature after low-temperature heat source heat exchange, be reduced to 25 ℃, this hot water of 25 ℃ 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 ℃ for user, and the secondary net backwater of 5 ℃ that the vaporizer side from multistage electric drive heat pump 11 is discharged is heated up after being 25 ℃ and entered in thermoelectricity plant's system by heat exchanger 5 heat exchange.
Absorption heat pumps at different levels all adopt the steam turbine heating of the about 0.3MPa driving of drawing gas.
The present invention is not limited to the present embodiment, and equivalent concepts or change in any technical scope disclosing in the present invention, all classify protection scope of the present invention as.
Claims (1)
1. significantly reduce a system for cogeneration of heat and power central heat supply temperature, it is characterized in that:
In thermoelectricity plant, in steam turbine (1), a part of high-temperature steam drives generator (2) generating, another part high-temperature steam is input to respectively steam double-effect absorption heat pump (6), steam single-effective absorption heat pump (7), the large temperature difference absorption heat pump of steam (8), as the power source participation heat exchange of absorption type heat pump assemblys at different levels;
Weary gas in steam turbine (1) enters into condensing engine (3), wherein a part of heat exchange be that the hot water of 40 ℃ is input in heat exchanger (5) is 25 ℃ by a secondary net backwater heat exchange of 5 ℃, another part accesses steam double-effect absorption heat pump (6), steam single-effective absorption heat pump (7), the large temperature difference absorption heat pump of steam (8) in parallel, as the low-temperature heat source of absorption type heat pump assemblys at different levels, after heat exchange, return in vapour condenser (3); 25 ℃ of hot water enters successively steam double-effect absorption heat pump (6), steam single-effective absorption heat pump (7), the large temperature difference absorption heat pump of steam (8) and is heated to respectively 55 ℃, 70 ℃, 90 ℃, and the hot water of last 90 ℃ supplies water and is input to absorption heat exchange unit (10) as a secondary net;
In heat exchange station, one secondary net of 90 ℃ supplies water input absorption heat exchange unit (10) as power source, after acting cooling, continue the low-temperature heat source as this absorption heat exchange unit (10), as temperature after low-temperature heat source heat exchange, be reduced to 25 ℃, this hot water of 25 ℃ 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 ℃ for user, the secondary net backwater of 5 ℃ that vaporizer side from multistage electric drive heat pump (11) is discharged enters in thermoelectricity plant's system after being 25 ℃ by heat exchanger (5) heat exchange intensification.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104315583A (en) * | 2014-09-23 | 2015-01-28 | 大连葆光节能空调设备厂 | Energy-saving heat supply system for reducing heat supply return water temperature and recovering city waste heat |
| CN108800268A (en) * | 2018-08-17 | 2018-11-13 | 国电龙源电力技术工程有限责任公司 | Heating system and method suitable for long range heat supply |
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| CN101619662A (en) * | 2009-08-14 | 2010-01-06 | 清华大学 | Method for recovering waste heat of thermal power plant and heating and supplying heat to hot water in a stepping way |
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| CN104315583A (en) * | 2014-09-23 | 2015-01-28 | 大连葆光节能空调设备厂 | Energy-saving heat supply system for reducing heat supply return water temperature and recovering city waste heat |
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| CN103628938B (en) | 2015-07-22 |
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Effective date of registration: 20210428 Address after: 116600 No. 8-21 west the Yellow Sea Road, Dalian Development Zone, Liaoning Patentee after: Dalian Baoguang energy saving air conditioning Co.,Ltd. Address before: 116600, No. 306, building 3, north science and technology incubation base, No. 34, Harbin Road, Dalian Development Zone, Dalian, Liaoning Patentee before: DALIAN BAOGUANG ENERGY-SAVING AIR CONDITIONING EQUIPMENT FACTORY |