CN104481611A - Dead steam waste heat recovery system based on large temperature difference heat exchange technology - Google Patents
Dead steam waste heat recovery system based on large temperature difference heat exchange technology Download PDFInfo
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- CN104481611A CN104481611A CN201410831966.XA CN201410831966A CN104481611A CN 104481611 A CN104481611 A CN 104481611A CN 201410831966 A CN201410831966 A CN 201410831966A CN 104481611 A CN104481611 A CN 104481611A
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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Abstract
The invention relates to a dead steam waste heat recovery system based on a large temperature difference heat exchange technology, and belongs to the field of waste heat recovery in a power plant. The system consists of a steam turbine, a condenser, a condensate pump, a steam-water heat exchanger, a lithium bromide absorption heat pump, a primary net circulating water pump, a waste heat water circulating pump, a large temperature difference heat exchanger unit, a secondary net circulating water pump and connecting pipelines. According to the system, the temperature of return water in a primary net is reduced by utilizing the large temperature difference heat exchange technology, return water in a heat supply network is heated by directly utilizing dead steam under the precondition of not changing the exhaust steam pressure of the steam turbine, meanwhile steam extraction of the steam turbine is utilized for driving the lithium bromide absorption heat pump to recycle the remaining dead steam exhaust heat for carrying out secondary heating on the return water in the primary net, and thus a great deal of waste caused by the fact that heat passes through a cooling tower system is avoided.
Description
Technical field
The invention belongs to residual heat of electric power plant and reclaim field, be related specifically to a kind of exhaust steam residual heat reclaiming system based on large temperature difference technology.
Background technique
In the main heating system in northern cities and towns, cogeneration of heat and power, because unit heating coal consumption is far below region boiler and all kinds of dispersion heating system, is the heat resource form that energy conversion efficiency generally acknowledged is at present the highest.At present, power plant heating system have two kinds of modes, the first utilizes the mode of the direct heating circulating water that draws gas of steam turbine, this kind of mode has the advantages that heating temperature is higher, supply backwater temperature difference large and heating service Area comparison is large, be applicable to large, medium and small sucking condensing turbine, adopt some the exhaust steam heat of condensation of this kind of mode to be lost in air eventually through cooling water; It two is adopt the mode of low vacuum heating, and this kind of mode is applicable to that a secondary net return water temperature is lower and the occasion that supply water temperature is not too high, heating service area is less, adopts this kind of mode to have the high advantage of the thermal efficiency.But above two kinds of modes have the shortcoming of oneself, mode one has a large amount of exhaust steam heats of condensation when operation and discharges into the atmosphere, and the supply water temperature of mode two can not be too high, and generally needs the exhaust steam pressure improving steam turbine, affects generated energy.
Summary of the invention
The object of the invention is the deficiency overcoming above two kinds of heat-supplying modes, a kind of exhaust steam residual heat reclaiming system based on large temperature difference technology is proposed, the feature that native system utilizes return water temperature low, the waste heat of the half of vapour condenser vapour condenser is directly reclaimed under the prerequisite not improving steam turbine exhaust pressure, second half of simultaneously vapour condenser, as the waste heat source of lithium bromide absorption type heat pump, carries out double heating to heat supply network backwater.Vapor-water heat exchanger heats as the third level, is delivered to large net after a secondary net backwater is heated to design temperature.Have under the prerequisite of equal heating load, the generated energy of steam turbine is more, and supply water temperature is higher.
The present invention proposes a kind of exhaust steam residual heat reclaiming system based on large temperature difference technology, it is characterized in that, this system is primarily of steam turbine, vapour condenser, condensate pump, vapor-water heat exchanger, lithium bromide absorption type heat pump, a secondary net circulating water pump, remaining hot water recycle pump, large temperature difference heat-exchange unit, secondary network circulating water pump and connecting tube composition; Its annexation is: the high pressure main steam inlet of steam turbine is connected with high temperature and high pressure steam pipeline, the exhaust steam outlet of steam turbine is connected with the exhaust steam entrance of vapour condenser, the water of condensation outlet of vapour condenser is connected with the entrance of condensate pump, and water of condensation delivery side of pump is connected with water of condensation main pipeline; The extraction opening of steam turbine is connected with the entrance of the steam inlet of vapor-water heat exchanger with the driving steam of lithium bromide absorption type heat pump respectively, and the water of condensation outlet of lithium bromide absorption heat pump exports with the water of condensation of vapor-water heat exchanger respectively and is connected with condensing water conduit; The hot water outlet of vapor-water heat exchanger is connected with the water supply line of the first side of other heat-exchange unit with the first side entrance of large temperature difference heat-exchange unit respectively; The first side water outlet of large temperature difference heat-exchange unit is connected with the first side outlet conduit of other large temperature difference heat-exchange unit with the entrance of a secondary net circulating water pump respectively, the outlet of one secondary net circulating water pump is connected with the cold side entrance of vapour condenser, the cold side outlet port of vapour condenser is connected with the heated side hot water inlet of lithium bromide absorption type heat pump, and the heated side hot water outlet of lithium bromide absorption type heat pump is connected with the hot water inlet of vapor-water heat exchanger; The remaining hot water entrance of lithium bromide absorption type heat pump is connected with remaining hot water circulation delivery side of pump, and the remaining hot water outlet of lithium bromide absorption type heat pump is connected with the cold side entrance of vapour condenser, and the cold side outlet of vapour condenser is connected with the entrance of waste heat circulation pump; Secondary network circulating water pump inlet side is connected with secondary network water return pipeline, and secondary network circulating water delivery side of pump is connected with the secondary network entrance of large temperature difference heat-exchange unit, and the secondary network outlet of large temperature difference heat-exchange unit is connected with water supply line.
Feature of the present invention and useful achievement:
The present invention is based on the exhaust steam residual heat reclaiming system of large temperature difference technology, large temperature difference technology is utilized to reduce the return water temperature of a secondary net, under the prerequisite not changing steam turbine exhaust pressure, directly utilize exhaust steam to heat heat supply network backwater, utilize drawing gas of steam turbine to drive lithium bromide absorption type heat pump to reclaim residue exhaust steam residual heat for carrying out secondary heating to a secondary net backwater simultaneously, thus avoid heat and caused a large amount of wastes by cooling tower systems.The present invention can reclaim the heat of condensation of the whole exhaust steam of steam turbine, avoids recirculating cooling water system to be wasted a large amount of heats and water resources by cooling tower, thus saves the energy, emissions reduction, improves the utilization ratio of primary energy, reduces the user cost of user.
Accompanying drawing explanation
A kind of exhaust steam residual heat reclaiming system structure based on large temperature difference technology of Fig. 1 and workflow schematic diagram.
Embodiment
The present invention propose a kind of exhaust steam residual heat reclaiming system Structure Figure based on large temperature difference technology and be described in detail as follows:
As shown in Figure 1, this system is primarily of steam turbine 1, vapour condenser 2, condensate pump 3, vapor-water heat exchanger 4, lithium bromide absorption type heat pump 5, secondary net circulating water pump 6, remaining hot water recycle pump 7, large temperature difference heat-exchange unit 8, secondary network circulating water pump 9 and connecting tube composition for structure of the present invention.Its annexation is:
The high pressure main steam inlet 11 of steam turbine 1 is connected with high temperature and high pressure steam pipeline a, the exhaust steam outlet 13 of steam turbine 1 is connected with the exhaust steam entrance 21 of vapour condenser 2, the water of condensation outlet 22 of vapour condenser 2 is connected with the entrance of condensate pump 3, and the outlet of condensate pump 3 is connected with water of condensation main pipeline b; The extraction opening 12 of steam turbine 1 is connected with the entrance 51 of the steam inlet 41 of vapor-water heat exchanger 4 with the driving steam of lithium bromide absorption type heat pump 5 respectively, and the water of condensation outlet 52 of lithium bromide absorption heat pump 5 exports 42 with the water of condensation of vapor-water heat exchanger 4 respectively and is connected with condensing water conduit e; The hot water outlet 44 of vapor-water heat exchanger 4 is connected with the water supply line d of the first side of other heat-exchange unit with the first side entrance 81 of large temperature difference heat-exchange unit 8 respectively; The first side water outlet 82 of large temperature difference heat-exchange unit 8 is connected with the first side outlet conduit c of other large temperature difference heat-exchange unit with the entrance of a secondary net circulating water pump 6 respectively, the outlet of one secondary net circulating water pump 6 is connected with the cold side entrance 23 of vapour condenser 2, the cold side outlet port 24 of vapour condenser 2 is connected with the heated side hot water inlet 53 of lithium bromide absorption type heat pump 5, and the heated side hot water outlet 54 of lithium bromide absorption type heat pump 5 is connected with the hot water inlet 43 of vapor-water heat exchanger 4; The remaining hot water entrance 55 of lithium bromide absorption type heat pump 5 is connected with the outlet of remaining hot water recycle pump 7, the remaining hot water outlet 56 of lithium bromide absorption type heat pump 5 is connected with the cold side entrance 25 of vapour condenser 2, and the cold side outlet 26 of vapour condenser 2 is connected with the entrance of waste heat circulation pump 7; Secondary network circulating water pump 9 inlet side is connected with secondary network water return pipeline f, and the outlet of secondary network circulating water pump 9 is connected with the secondary network entrance 83 of large temperature difference heat-exchange unit 8, and the secondary network outlet 84 of large temperature difference heat-exchange unit is connected with water supply line g.
The working principle of native system and effect: this technology mainly sets up large temperature difference heat-exchange unit, reduce return water temperature, thus directly reclaim the heat of condensation of exhaust steam on the basis of not improving gas turbine exhaust gas pressure.Also set up lithium bromide absorption type heat pump simultaneously, utilize heat pump techniques directly to reclaim second half exhaust steam residual heat of vapour condenser, finally utilize vapor-water heat exchanger to heat further hot net water, accomplished the cascade utilization of energy.This technology path is compared with rough vacuum heating technology, and one is to reduce exhaust pressure; Two is to improve supply water temperature.Meanwhile, the UTILIZATION OF VESIDUAL HEAT IN amount of exhaust steam and the generated energy of equipment are much larger than traditional extracted steam from turbine heating system.
The present invention utilizes large temperature difference technology to reduce a secondary net return water temperature, thus under the prerequisite not changing steam turbine exhaust pressure, directly utilize exhaust steam to heat a secondary net heat supply network backwater, utilize drawing gas of steam turbine to drive lithium bromide absorption type heat pump to reclaim residue exhaust steam residual heat for carrying out secondary heating to a secondary net backwater simultaneously, thus avoid heat and caused a large amount of wastes by cooling tower systems.
The embodiment of the equipment in the present invention all adopts matured product.
1, steam turbine: being the sucking condensing turbine group of maturation, is power plant's existing equipment, as C6-4.9/0.49;
2, vapour condenser: being the double-flow dividing wall type vapour condenser of maturation, is power plant's existing equipment, as heat exchange area 2000 ㎡ of vapour condenser;
3, condensate pump is the condensate pump of maturation, is power plant's existing equipment;
4, vapor-water heat exchanger is traditional spike steam-water heat exchanging equipment.According to heat exchange amount and heat exchange difference determination heat exchange area;
5, lithium bromide absorption type heat pump: be matured product, according to adding heat, the temperature of the out temperature of waste heat side and the import and export of heated side determines, as RHP20;
6, a circulation pump of heat-supply network, according to the flow of heat load and supply and return water temperature determination heat supply network, according to index circuit determination water lift of pump, according to the model of lift and flow determination water pump;
7, remaining hot water circulating water pump, according to the temperature difference determination remaining hot water quantity of circulating water of the import and export of waste heat load and vapour condenser, according to the water resistance determination water lift of pump of the remaining hot water circulatory system, according to the model of lift and flow determination water pump;
8, large temperature difference heat-exchange unit, supplies water according to heat exchange amount and heat supply network and the supply and return water temperature of return water temperature and secondary network determines the model of large temperature difference heat-exchange unit;
9, load side circulating water pump, according to the flow of the supply and return water temperature determination water pump of heat load and secondary network, according to index circuit determination lift, according to the model of lift and flow determination water pump.
Claims (1)
1. the exhaust steam residual heat reclaiming system based on large temperature difference technology, it is characterized in that, this system is primarily of steam turbine, vapour condenser, condensate pump, vapor-water heat exchanger, lithium bromide absorption type heat pump, a secondary net circulating water pump, remaining hot water recycle pump, large temperature difference heat-exchange unit, secondary network circulating water pump and connecting tube composition; Its annexation is: the high pressure main steam inlet of steam turbine is connected with high temperature and high pressure steam pipeline, the exhaust steam outlet of steam turbine is connected with the exhaust steam entrance of vapour condenser, the water of condensation outlet of vapour condenser is connected with the entrance of condensate pump, and water of condensation delivery side of pump is connected with water of condensation main pipeline; The extraction opening of steam turbine is connected with the entrance of the steam inlet of vapor-water heat exchanger with the driving steam of lithium bromide absorption type heat pump respectively, and the water of condensation outlet of lithium bromide absorption heat pump exports with the water of condensation of vapor-water heat exchanger respectively and is connected with condensing water conduit; The hot water outlet of vapor-water heat exchanger is connected with the water supply line of the first side of other heat-exchange unit with the first side entrance of large temperature difference heat-exchange unit respectively; The first side water outlet of large temperature difference heat-exchange unit is connected with the first side outlet conduit of other large temperature difference heat-exchange unit with the entrance of a secondary net circulating water pump respectively, the outlet of one secondary net circulating water pump is connected with the cold side entrance of vapour condenser, the cold side outlet port of vapour condenser is connected with the heated side hot water inlet of lithium bromide absorption type heat pump, and the heated side hot water outlet of lithium bromide absorption type heat pump is connected with the hot water inlet of vapor-water heat exchanger; The remaining hot water entrance of lithium bromide absorption type heat pump is connected with remaining hot water circulation delivery side of pump, and the remaining hot water outlet of lithium bromide absorption type heat pump is connected with the cold side entrance of vapour condenser, and the cold side outlet of vapour condenser is connected with the entrance of waste heat circulation pump; Secondary network circulating water pump inlet side is connected with secondary network water return pipeline, and secondary network circulating water delivery side of pump is connected with the secondary network entrance of large temperature difference heat-exchange unit, and the secondary network outlet of large temperature difference heat-exchange unit is connected with water supply line.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106402981A (en) * | 2016-08-30 | 2017-02-15 | 洛阳双瑞特种装备有限公司 | Large-temperature-difference waste heat recovery heat supply unit for electric drive heat pumps |
| CN107166480A (en) * | 2017-06-08 | 2017-09-15 | 中广核工程有限公司 | Nuclear power plant's heating plant heat-exchange system |
| CN107300203A (en) * | 2017-07-05 | 2017-10-27 | 燕山大学 | Utilize the heat pump heat distribution system and method for across the season storage power taking factory exhaust steam residual heat of soil |
| CN107621000A (en) * | 2017-09-06 | 2018-01-23 | 同方节能装备有限公司 | A kind of big temperature difference heat-exchange unit |
| CN108800275A (en) * | 2018-07-16 | 2018-11-13 | 河南理工大学 | A kind of big temperature-difference central heating system and working method using residual heat of electric power plant |
| CN108870507A (en) * | 2018-04-03 | 2018-11-23 | 大连葆光节能空调设备厂 | A kind of big temperature-difference central heating system using double condensers |
| CN109405032A (en) * | 2017-08-18 | 2019-03-01 | 国家电投集团科学技术研究院有限公司 | Nuclear power station waste heat for supplying system |
| CN110030609A (en) * | 2019-03-22 | 2019-07-19 | 中冶西北工程技术有限公司 | Circulating cooling water afterheat recycling system |
| CN111351116A (en) * | 2018-12-20 | 2020-06-30 | 大连民族大学 | Heating method of lithium bromide heat pump with heat pump and plate heat exchanger mixed for cogeneration of power plant |
| CN111351252A (en) * | 2018-12-20 | 2020-06-30 | 大连民族大学 | Cogeneration method for power plant |
| CN111351115A (en) * | 2018-12-20 | 2020-06-30 | 大连民族大学 | Power plant cogeneration method for heating by lithium bromide heat pump |
| CN111351108A (en) * | 2018-12-20 | 2020-06-30 | 大连民族大学 | Heat pump heat exchange method of lithium bromide with heat and power mixed and heat supplemented |
| CN112378112A (en) * | 2020-11-10 | 2021-02-19 | 国网天津市电力公司 | Exhaust steam waste heat utilization system and utilization method based on absorption heat pump |
| CN113375209A (en) * | 2021-06-28 | 2021-09-10 | 大唐环境产业集团股份有限公司 | Large temperature difference heat supply method and system for coal-fired unit coupling compression heat pump |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106402981A (en) * | 2016-08-30 | 2017-02-15 | 洛阳双瑞特种装备有限公司 | Large-temperature-difference waste heat recovery heat supply unit for electric drive heat pumps |
| CN107166480A (en) * | 2017-06-08 | 2017-09-15 | 中广核工程有限公司 | Nuclear power plant's heating plant heat-exchange system |
| CN107300203A (en) * | 2017-07-05 | 2017-10-27 | 燕山大学 | Utilize the heat pump heat distribution system and method for across the season storage power taking factory exhaust steam residual heat of soil |
| CN107300203B (en) * | 2017-07-05 | 2023-08-29 | 燕山大学 | Heat pump heating system and method for accumulating waste heat of dead steam of power plant by utilizing soil in cross-season mode |
| CN109405032A (en) * | 2017-08-18 | 2019-03-01 | 国家电投集团科学技术研究院有限公司 | Nuclear power station waste heat for supplying system |
| CN109405032B (en) * | 2017-08-18 | 2024-03-19 | 国家电投集团科学技术研究院有限公司 | Nuclear power station waste heat supply system |
| CN107621000A (en) * | 2017-09-06 | 2018-01-23 | 同方节能装备有限公司 | A kind of big temperature difference heat-exchange unit |
| CN108870507A (en) * | 2018-04-03 | 2018-11-23 | 大连葆光节能空调设备厂 | A kind of big temperature-difference central heating system using double condensers |
| CN108800275B (en) * | 2018-07-16 | 2023-05-26 | 河南理工大学 | Large-temperature-difference central heating system utilizing waste heat of power plant and working method |
| CN108800275A (en) * | 2018-07-16 | 2018-11-13 | 河南理工大学 | A kind of big temperature-difference central heating system and working method using residual heat of electric power plant |
| CN111351116A (en) * | 2018-12-20 | 2020-06-30 | 大连民族大学 | Heating method of lithium bromide heat pump with heat pump and plate heat exchanger mixed for cogeneration of power plant |
| CN111351108A (en) * | 2018-12-20 | 2020-06-30 | 大连民族大学 | Heat pump heat exchange method of lithium bromide with heat and power mixed and heat supplemented |
| CN111351115A (en) * | 2018-12-20 | 2020-06-30 | 大连民族大学 | Power plant cogeneration method for heating by lithium bromide heat pump |
| CN111351252A (en) * | 2018-12-20 | 2020-06-30 | 大连民族大学 | Cogeneration method for power plant |
| CN110030609A (en) * | 2019-03-22 | 2019-07-19 | 中冶西北工程技术有限公司 | Circulating cooling water afterheat recycling system |
| CN110030609B (en) * | 2019-03-22 | 2024-06-07 | 中冶西北工程技术有限公司 | Circulating cooling water waste heat recycling system |
| CN112378112A (en) * | 2020-11-10 | 2021-02-19 | 国网天津市电力公司 | Exhaust steam waste heat utilization system and utilization method based on absorption heat pump |
| CN113375209A (en) * | 2021-06-28 | 2021-09-10 | 大唐环境产业集团股份有限公司 | Large temperature difference heat supply method and system for coal-fired unit coupling compression heat pump |
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Application publication date: 20150401 |