CN103628938B - 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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- CN103628938B CN103628938B CN201310643880.XA CN201310643880A CN103628938B CN 103628938 B CN103628938 B CN 103628938B CN 201310643880 A CN201310643880 A CN 201310643880A CN 103628938 B CN103628938 B CN 103628938B
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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]
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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, particularly relate to a kind of system significantly reducing 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, 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 heat supply, household small-size gas water-heating furnace, family's coal stove 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 thermoelectricity 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 thermoelectricity 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.Need a large amount of thermal insulating materials to reduce the loss of heat in the steam heating pipeline of another aspect high temperature; When heating temperature is higher, although use more thermal insulating material can cause larger heat loss.
Summary of the invention
Can not to be fully utilized problem and the shortcoming of a large amount of heat loss in hot duct for a large amount of latent heats of vaporization in exhaust steam in steam turbine, to the invention provides a kind of system significantly reducing cogeneration of heat and power central heat supply temperature.
The technological scheme that the present invention adopts for technical solution problem is:
In thermoelectricity 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 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 vapour condenser, 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 5 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 vapour condenser; 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, and the hot water of last 90 DEG C supplies water as a secondary net and is input to absorption heat exchange unit;
In heat exchange station, one secondary net of 90 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, enters in thermoelectricity plant's system after a secondary net backwater of 5 DEG C of the vaporizer side discharge multistage electric drive heat pump is 25 DEG C by heat exchanger heat exchange intensification.
Absorption heat pump at different levels all adopts the steam turbine of about 0.3MPa to heat and to draw gas driving.
The invention has the beneficial effects as follows:
One secondary net supply water temperature is reduced to 90 DEG C, saves the heating amount of drawing gas of thermoelectricity plant, adds the generating capacity of thermoelectricity plant; The reduction of the water temperature that simultaneously heats saves the consumption of thermal insulating material and decreases heat supply pipeline heat loss.
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;
Heat exchanger is added in addition in thermoelectricity plant, a secondary net backwater water temperature is promoted with the low-grade heat source in vapour condenser, introduce steam double-effect absorption heat pump, steam single-effective absorption heat pump, the large temperature difference absorption heat pump of steam simultaneously, reclaim low-grade heat step by step, 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. vapour condenser, 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 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 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 vapour condenser 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 vapour condenser 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, and the hot water of last 90 DEG C supplies water as a secondary net and is input to absorption heat exchange unit 10;
In heat exchange station, one secondary net of 90 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, enters in thermoelectricity plant's system after a secondary net backwater of 5 DEG C of the vaporizer side discharge multistage electric drive heat pump 11 is 25 DEG C by heat exchanger 5 heat exchange intensification.
Absorption heat pump at different levels all adopts 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. 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 steam double-effect absorption heat pump (6), steam single-effective absorption heat pump (7), the large temperature difference absorption heat pump (8) of steam 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 vapour condenser (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 5 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 vapour condenser (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, and the hot water of last 90 DEG C supplies water as a secondary net and is input to absorption heat exchange unit (10);
In heat exchange station, one secondary net of 90 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, the one secondary net backwater of 5 DEG C of discharging from the vaporizer side multistage electric drive heat pump (11) passes through to enter in thermoelectricity plant's system after heat exchanger (5) heat exchange intensification is 25 DEG C.
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| CN201310643880.XA CN103628938B (en) | 2013-12-04 | 2013-12-04 | System for greatly reducing cogeneration centralized heat supply temperature |
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| CN201310643880.XA CN103628938B (en) | 2013-12-04 | 2013-12-04 | System for greatly reducing cogeneration centralized heat supply temperature |
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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 |
| CN108800268B (en) * | 2018-08-17 | 2023-07-04 | 国能龙源电力技术工程有限责任公司 | Heating system and method suitable for long-distance heat supply |
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| US6848267B2 (en) * | 2002-07-26 | 2005-02-01 | Tas, Ltd. | Packaged chilling systems for building air conditioning and process cooling |
| CN101619662B (en) * | 2009-08-14 | 2012-05-16 | 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 |
| CN101949612B (en) * | 2010-08-27 | 2012-11-14 | 清华大学 | Cooling mode driven by utilizing urban heat supply network |
| CN102022145B (en) * | 2010-11-18 | 2014-03-05 | 清华大学 | Steam exhaust waste heat recovery unit |
| CN102330579B (en) * | 2011-07-27 | 2014-02-26 | 双良节能系统股份有限公司 | Combined type heating system for recovering condensation waste heat of main stream turbine and auxiliary stream turbine of thermal power plant |
| CN202176380U (en) * | 2011-08-22 | 2012-03-28 | 河北联合大学 | Comprehensive utilization device of waste steam latent heat of turbine |
| CN203685320U (en) * | 2013-12-04 | 2014-07-02 | 大连葆光节能空调设备厂 | System for greatly reducing central heating temperature of heat and power cogeneration |
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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 |
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