CN203685320U - System for greatly reducing central heating temperature of heat and power cogeneration - Google Patents

System for greatly reducing central heating temperature of heat and power cogeneration Download PDF

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Publication number
CN203685320U
CN203685320U CN201320799168.4U CN201320799168U CN203685320U CN 203685320 U CN203685320 U CN 203685320U CN 201320799168 U CN201320799168 U CN 201320799168U CN 203685320 U CN203685320 U CN 203685320U
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China
Prior art keywords
heat
steam
temperature
heat pump
absorption
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CN201320799168.4U
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Chinese (zh)
Inventor
姚伟君
毕海洋
迟建华
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大连葆光节能空调设备厂
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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
    • 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]

Abstract

The utility model relates to a system for greatly reducing central heating temperature of the heat and power cogeneration. In the system, an absorption heat-exchange unit, and a multi-level electrically-driven thermal pump are introduced, so as to repeatedly perform utilization of power source and heat exchange on the heat source, so that the utilization efficiency of the steam heat source is improved and the system can better supply heat to a user; besides, a condensing engine is introduced to the thermal power plant to recycle low-grade heat sources; simultaneously, a steam dual-purpose absorption heat pump, a steam single-effect absorption heat pump and a steam large-temperature-difference absorption heat pump are introduced to recycle low-grade heat quantities step by step, so that exhaust steam in a steam turbine is effectively utilized and the utilization efficiency of the energy source is improved; as the temperature of a primary water supply network is decreased to 90 DEC, heating steam extraction quantity in the thermal power plant is saved and the power generation capacity of the thermal power plant is improved; the heat preservation material consumption and thermal losses of a heating pipeline are saved as the result of the decrease of the heating water temperature.

Description

Significantly reduce the system of cogeneration of heat and power central heat supply temperature
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
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 in recent years.Analyze from heat-supplying mode, 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.At present the average generating efficiency of 3,000,000 kilowatts of firepower electrical plants of China is 33%, and generating efficiency can reach 20% when thermoelectricity plant's heat supply, 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.In this sense, the efficiency of thermoelectricity plant's heat supply is 170%, is about 2 times of medium small boiler room heating efficiency.Therefore in the time of conditions permit, should first develop the heating system of cogeneration of heat and power.However, 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 in cogeneration of heat and power mode.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 for 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, participates in heat exchange as the power source 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 DEG C is input in heat exchanger is 25 DEG C by a secondary net backwater heat exchange of 5 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 assemblys at different levels, after heat exchange, return in vapour condenser; 25 DEG C 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 DEG C, 70 DEG C, 90 DEG C, and the hot water of last 90 DEG C supplies water and is input to absorption heat exchange unit as a secondary net;
In heat exchange station, one secondary net of 90 DEG C 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, be reduced to 25 DEG C 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, and the secondary net backwater of 5 DEG C that the vaporizer side from multistage electric drive heat pump is discharged is heated up after being 25 DEG C 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 DEG C, 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, promote a secondary net backwater water temperature 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 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%.
Brief description of the drawings
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 to generate electricity, 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, participates in heat exchange as the power source 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 DEG C is input in heat exchanger 5 is 25 DEG C by a secondary net backwater heat exchange of 15 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 assemblys at different levels, after heat exchange, return in vapour condenser 3; 25 DEG C 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 DEG C, 70 DEG C, 90 DEG C, and the hot water of last 90 DEG C supplies water and is input to absorption heat exchange unit 10 as a secondary net;
In heat exchange station, one secondary net of 90 DEG C 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, be reduced to 25 DEG C 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, and the secondary net backwater of 5 DEG C that the vaporizer side from multistage electric drive heat pump 11 is discharged is heated up after being 25 DEG C 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. a system that significantly reduces cogeneration of heat and power central heat supply temperature, 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), participates in heat exchange as the power source 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 DEG C is input in heat exchanger (5) is 25 DEG C by a secondary net backwater heat exchange of 5 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 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 DEG C 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 DEG C, 70 DEG C, 90 DEG C, and the hot water of last 90 DEG C supplies water and is input to absorption heat exchange unit (10) as a secondary net;
In heat exchange station, one secondary net of 90 DEG C 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), be reduced to 25 DEG C 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 secondary net backwater of 5 DEG C that vaporizer side from multistage electric drive heat pump (11) is discharged enters in thermoelectricity plant's system after being 25 DEG C by heat exchanger (5) heat exchange intensification.
CN201320799168.4U 2013-12-04 2013-12-04 System for greatly reducing central heating temperature of heat and power cogeneration CN203685320U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103628938A (en) * 2013-12-04 2014-03-12 大连葆光节能空调设备厂 System for greatly reducing cogeneration centralized heat supply temperature
CN106765042A (en) * 2016-12-05 2017-05-31 中国华能集团清洁能源技术研究院有限公司 The coal fired power plant broad sense heat regenerative system and method for a kind of combination nature draught cooling tower
CN109595667A (en) * 2018-12-20 2019-04-09 大连民族大学 Mixed point of solar energy concurrent heating lithium bromide heat pump heating device
CN109595670A (en) * 2018-12-20 2019-04-09 大连民族大学 The heat pump heat exchanging device of the mixed lithium bromide for dividing concurrent heating of thermoelectricity

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103628938A (en) * 2013-12-04 2014-03-12 大连葆光节能空调设备厂 System for greatly reducing cogeneration centralized heat supply temperature
CN106765042A (en) * 2016-12-05 2017-05-31 中国华能集团清洁能源技术研究院有限公司 The coal fired power plant broad sense heat regenerative system and method for a kind of combination nature draught cooling tower
CN109595667A (en) * 2018-12-20 2019-04-09 大连民族大学 Mixed point of solar energy concurrent heating lithium bromide heat pump heating device
CN109595670A (en) * 2018-12-20 2019-04-09 大连民族大学 The heat pump heat exchanging device of the mixed lithium bromide for dividing concurrent heating of thermoelectricity

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Owner name: TIANJIN BAOGUANG HUINENG NEW ENERGY TECHNOLOGY CO.

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Address after: 116600, No. 306, building 3, north science and technology incubation base, No. 34, Harbin Road, Dalian Development Zone, Dalian, Liaoning

Patentee after: Dalian Baoguang Energy-saving Air Conditioning Equipment Plant

Patentee after: Tianjin Bao Guanghuineng new energy technology 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 Plant

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