CN103629724B - Significantly reduce the system of cogeneration of heat and power central heating temperature - Google Patents

Significantly reduce the system of cogeneration of heat and power central heating temperature Download PDF

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CN103629724B
CN103629724B CN201310655682.5A CN201310655682A CN103629724B CN 103629724 B CN103629724 B CN 103629724B CN 201310655682 A CN201310655682 A CN 201310655682A CN 103629724 B CN103629724 B CN 103629724B
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steam
heat pump
heat
temperature
absorption heat
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CN103629724A (en
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毕海洋
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Dalian University
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Dalian University
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/12Hot water central heating systems using heat pumps
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/14Combined heat and power generation [CHP]

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Abstract

Significantly reduce a system for cogeneration of heat and power central heating temperature, 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 carry out intensification energy-conserving and environment-protective to a secondary net backwater; 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, 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.One secondary net supply water temperature is reduced to 90 DEG C, saves the heating amount of drawing gas of steam power plant, adds the generating capacity of steam power plant; The reduction of the water temperature that simultaneously heats saves the consumption of insulation material, decreases heat supply pipeline thermal losses.

Description

Significantly reduce the system of cogeneration of heat and power central heating temperature
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 heating temperature.
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.Need a large amount of insulation 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 insulation material can cause larger thermal losses.
Summary of the invention
Can not to be fully utilized problem and the shortcoming of a large amount of thermal losses 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 heating temperature.
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 respectively, and the power source as absorption type heat pump assembly at different levels participates in heat exchange;
Exhaust steam 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, 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, 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 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 steam power plant, adds the generating capacity of steam power plant; The reduction of the water temperature that simultaneously heats saves the consumption of insulation material and decreases heat supply pipeline thermal losses.
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 carry out intensification energy-conserving and environment-protective to a secondary net backwater;
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, 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. 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, 12. solar thermal collectors, 13. users
Detailed description of the invention
In steam power 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;
Exhaust steam 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, 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, 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 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 heating temperature, 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 respectively, and the power source as absorption type heat pump assembly at different levels participates in heat exchange;
Exhaust steam 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, 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, 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).
CN201310655682.5A 2013-12-04 2013-12-04 Significantly reduce the system of cogeneration of heat and power central heating temperature Active CN103629724B (en)

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* Cited by examiner, † Cited by third party
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CN108930995B (en) * 2018-08-01 2020-04-14 东北大学 Central heating system for combined heating of solar energy and low-grade industrial waste heat
CN109442815B (en) * 2018-11-29 2024-04-09 宁波杭州湾新区祥源动力供应有限公司 Double-effect water chilling unit system based on steam condensate recycling
CN111351264A (en) * 2018-12-20 2020-06-30 大连民族大学 Heat supplementing and heating method for solar energy and lithium bromide heat pump
CN111351110A (en) * 2018-12-20 2020-06-30 大连民族大学 Solar energy supplied lithium bromide heat pump heat supply method
CN111351251A (en) * 2018-12-20 2020-06-30 大连民族大学 Unmixed heat-supplementing lithium bromide heat pump heating method

Citations (5)

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Publication number Priority date Publication date Assignee Title
JP2007064047A (en) * 2005-08-30 2007-03-15 Hitachi Eng Co Ltd Waste heat recovery facility for steam turbine plant
CN101231004A (en) * 2008-02-28 2008-07-30 清华大学 Large temperature-difference central heating system
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
KR100975276B1 (en) * 2009-12-01 2010-08-12 주식회사 코와 Local heating water feeding system using absorbing type heat pump
CN101949612A (en) * 2010-08-27 2011-01-19 清华大学 Cooling mode driven by utilizing urban heat supply network

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007064047A (en) * 2005-08-30 2007-03-15 Hitachi Eng Co Ltd Waste heat recovery facility for steam turbine plant
CN101231004A (en) * 2008-02-28 2008-07-30 清华大学 Large temperature-difference central heating system
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
KR100975276B1 (en) * 2009-12-01 2010-08-12 주식회사 코와 Local heating water feeding system using absorbing type heat pump
CN101949612A (en) * 2010-08-27 2011-01-19 清华大学 Cooling mode driven by utilizing urban heat supply network

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