CN103629724A - System for greatly reducing district heating temperature by cogeneration - Google Patents
System for greatly reducing district heating temperature by cogeneration Download PDFInfo
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- CN103629724A CN103629724A CN201310655682.5A CN201310655682A CN103629724A CN 103629724 A CN103629724 A CN 103629724A CN 201310655682 A CN201310655682 A CN 201310655682A CN 103629724 A CN103629724 A CN 103629724A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 22
- 238000010521 absorption reaction Methods 0.000 claims abstract description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 230000000712 assembly Effects 0.000 claims description 6
- 238000000429 assembly Methods 0.000 claims description 6
- 239000006200 vaporizer Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 238000010795 Steam Flooding Methods 0.000 claims description 3
- 239000012774 insulation material Substances 0.000 abstract description 4
- 238000000605 extraction Methods 0.000 abstract 1
- 239000008236 heating water Substances 0.000 abstract 1
- 238000010248 power generation Methods 0.000 abstract 1
- 239000002699 waste material Substances 0.000 abstract 1
- 239000000446 fuel Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/12—Hot water central heating systems using heat pumps
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 district heating temperature by cogeneration. By introducing an absorption heat exchanger unit and a multi-stage electrically driven heat pump, a heat source is used as a power source and for heat exchange time after time, so that the utilization efficiency of a steam heat source is improved, and heat is supplied to users better; a solar collector is introduced, so that solar energy as clean energy is used for raising the temperature of primary-network backwater, saving energy and protecting environment; in addition, a heat exchanger is added in a thermal power plant, and a low-grade heat source in a condensing machine is used for raising the temperature of the primary-network backwater; meanwhile, a steam double-effect absorption heat pump, a steam single-effect absorption heat pump, and a steam large-temperature-difference absorption heat pump are introduced to gradually recover low-grade heat, waste steam in a turbine is effectively utilized, and the utilization efficiency of energy is improved. The primary-network water supply temperature is reduced to 90 DEG C, the heating steam extraction capacity of the thermal power plant is saved, and the power generation capacity of the thermal power plant is increased; meanwhile, the amount of heat insulation materials is saved by reduction in heating water temperature, and the heat loss of a heating pipe is reduced.
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 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, 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 heating, household small-size gas water-heating furnace, family's coal furnace 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 steam power 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 steam power 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 insulation materials to reduce the loss of heat on the other hand; In the situation that heating temperature is higher, although use more insulation material can cause larger thermal losses.
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 thermal losses in hot duct, the invention provides a kind of system that significantly reduces cogeneration of heat and power central heating temperature.
The present invention is that the technical scheme that technical solution problem adopts is:
In steam power 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 15 ℃, 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 condensing engine; 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, the secondary net backwater of 5 ℃ that vaporizer side from multistage electric drive heat pump is discharged is input in solar thermal collector a secondary net return water temperature is heated to 15 ℃, then by heat exchanger, enter in steam power plant's system.
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 steam power plant, has increased the generating capacity of steam power plant; The reduction of the water temperature that simultaneously heats has been saved the consumption of insulation material and has been reduced heat supply pipeline thermal losses.
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;
Introduce solar thermal collector, utilize this clean energy resource of solar energy to the secondary net backwater energy-conserving and environment-protective that heat up;
In steam power 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, 12. solar thermal collectors, 13. users
The specific embodiment
In steam power 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 condensing engine 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, the secondary net backwater of 5 ℃ that vaporizer side from multistage electric drive heat pump 11 is discharged is input in solar thermal collector 12 a secondary net return water temperature is heated to 15 ℃, then by heat exchanger 5, enter in steam power plant's system.
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 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 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 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 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 condensing engine (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 is input in solar thermal collector (12) a secondary net return water temperature is heated to 15 ℃, then by heat exchanger (5), enter in steam power plant's system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310655682.5A CN103629724B (en) | 2013-12-04 | 2013-12-04 | Significantly reduce the system of cogeneration of heat and power central heating temperature |
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| CN201310655682.5A CN103629724B (en) | 2013-12-04 | 2013-12-04 | Significantly reduce the system of cogeneration of heat and power central heating temperature |
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| CN103629724A true CN103629724A (en) | 2014-03-12 |
| CN103629724B CN103629724B (en) | 2015-12-30 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108930995A (en) * | 2018-08-01 | 2018-12-04 | 东北大学 | A kind of central heating system of solar energy and low-grade industrial exhaust heat united heat |
| CN109442815A (en) * | 2018-11-29 | 2019-03-08 | 宁波杭州湾新区祥源动力供应有限公司 | A kind of economic benefits and social benefits water chilling unit system recycled based on steam condensate |
| 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 |
| CN111351251A (en) * | 2018-12-20 | 2020-06-30 | 大连民族大学 | Unmixed heat-supplementing lithium bromide heat pump heating method |
| CN111351110A (en) * | 2018-12-20 | 2020-06-30 | 大连民族大学 | Solar energy supplied lithium bromide heat pump heat supply method |
Citations (5)
| 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 |
-
2013
- 2013-12-04 CN CN201310655682.5A patent/CN103629724B/en not_active Expired - Fee Related
Patent Citations (5)
| 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 |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108930995A (en) * | 2018-08-01 | 2018-12-04 | 东北大学 | A kind of central heating system of solar energy and low-grade industrial exhaust heat united heat |
| 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 |
| CN109442815A (en) * | 2018-11-29 | 2019-03-08 | 宁波杭州湾新区祥源动力供应有限公司 | A kind of economic benefits and social benefits water chilling unit system recycled based on steam condensate |
| 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 |
| CN111351251A (en) * | 2018-12-20 | 2020-06-30 | 大连民族大学 | Unmixed heat-supplementing lithium bromide heat pump heating method |
| CN111351110A (en) * | 2018-12-20 | 2020-06-30 | 大连民族大学 | Solar energy supplied lithium bromide heat pump heat supply method |
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| CN103629724B (en) | 2015-12-30 |
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