CN106705185A - Energy-saving heat supply system with function of reducing temperature of heat supply return water - Google Patents
Energy-saving heat supply system with function of reducing temperature of heat supply return water Download PDFInfo
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- CN106705185A CN106705185A CN201611242522.8A CN201611242522A CN106705185A CN 106705185 A CN106705185 A CN 106705185A CN 201611242522 A CN201611242522 A CN 201611242522A CN 106705185 A CN106705185 A CN 106705185A
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- temperature
- backwater
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 238000010521 absorption reaction Methods 0.000 claims abstract description 32
- 238000001816 cooling Methods 0.000 claims abstract description 19
- 230000006835 compression Effects 0.000 claims abstract description 14
- 238000007906 compression Methods 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims description 81
- 238000010792 warming Methods 0.000 claims description 12
- 239000000498 cooling water Substances 0.000 claims description 11
- 238000005057 refrigeration Methods 0.000 claims description 11
- 239000008188 pellet Substances 0.000 claims description 10
- 238000000605 extraction Methods 0.000 claims description 2
- 239000002918 waste heat Substances 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000002245 particle Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 6
- 239000000446 fuel Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000010908 plant waste Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/06—Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/16—Waste heat
-
- 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]
Abstract
The invention discloses an energy-saving heat supply system with a function of reducing the temperature of heat supply return water, and belongs to the field of improvement of energy utilization efficiency. Heat exchange can be repeatedly carried out on heat sources by multistage heat exchangers, multistage absorption heat exchange units, multistage compression heat pumps and an ice making type refrigerator, accordingly, the heat supply areas can be enlarged, and the energy utilization efficiency can be improved. The energy-saving heat supply system has the advantages that the temperature of the return water of heat supply primary pipe networks can be reduced and reach 0 DEG C, the return water contains 10% of ice particles, accordingly, route heat loss of the return water of the heat supply primary pipe networks can be reduced, the temperature difference of the return water of the heat supply primary pipe networks can be increased and reaches 118 DEG C from the original 60 DEG C, the flow rate of circulating water of the heat supply primary pipe networks can be lowered, energy consumption of circulating pumps can be reduced, heat supply flow rates of a user side can be greatly increased, the delivery efficiency of the pipe networks can be improved, the heat supply scale can be expanded, waste heat of a cooling tower can be recycled, and the like.
Description
Technical field
The invention belongs to improve efficiency of energy utilization field, it is related to an a kind of reduction cogeneration of heat and power pipe network backwater temperature of heating
Degree, the energy-saving heating system for significantly expanding heat supplying scale.
Background technology
The ladder that although current cogeneration of heat and power realizes the energy is utilized, but still belongs to traditional heating mode, and heating efficiency is low,
Energy waste is big.The problem that current traditional heating mode is present mainly has：
1st, the used heat that steam power plant's cooling tower is distributed is the heat sources that a city maximum is most concentrated, and is referred to as " giving up in city
Heat energy isolated island ", heat can not be conveyed out, and cooling tower used heat grade is low, it is impossible to be utilized.
2nd, steam power plant's cooling tower dispersed heat accounts for the 20%-30% of total consumption of coal.
3rd, steam power plant's cooling tower waste heat need to evaporate substantial amounts of water resource, and situation is more severe for the north of water shortage.
4th, traditional 110 DEG C of pipe network water supply temperature of heating system one time, 50 DEG C of return water temperature, supply backwater temperature difference is small.
5th, pipe network supply backwater temperature difference of heating is small causes circulating pump energy consumption big, and transfer efficiency is low.
6th, traditional 50 DEG C of pipe network return water temperature of heating system one time, the high-temperature steam directly extracted out with steam turbine exchanges heat and heats up
To 110 DEG C, need quantity of steam very big, cause generated energy to reduce.
7th, traditional 110 DEG C of pipe network water supply temperature of heating system one time, 50 DEG C of return water temperature, for water return pipeline temperature and the earth
Temperature difference is larger, and water supply has heat loss, and backwater also has heat loss.
8th, because pipe network return water temperature of heating is 50 DEG C, the used heat of power plant cooling tower cannot be added, and be caused a large amount of
Used heat is wasted.
9th, existing heating network conveying capacity is limited, it is difficult to meet require, to expand heating network, then put into it is huge and
Road is needed brokenly to construct, it is severely limited in urban core region.
10th, other independent fire coals of current cogeneration of heat and power generally existing or the boiler room of combustion gas, by fuel (coal, oil, day
Right gas etc.) direct combustion heat supplying, only make use of the amount of the energy, it is clear that be the waste (fire fall fire is without liter) to high-grade energy,
Directly burning is equal to the energy for slatterning half to fuel.China's gas degree of self-sufficiency is not enough, it is necessary to a large amount of imports, directly burning is right
The waste of the energy is utilized.
11st, the property safe and reliable to operation of independent boiler room is low, if one of link goes wrong, can influence whole confession
Hot systems.
Based on these problems, my corporation in 2006 obtains the patented technology of Patent No. ZL200610099043.5, adopts
The heat supply method combined with vapor heat exchanger with absorption type heat pump assembly, the system does not change existing steam power plant's installed capacity and carries
The quantity of steam of confession, and its heat capacity is improve, and increased heat capacity is equivalent to the heat for not consuming steam.Obtain within 2016
The patent of invention of the Patent No. CN201310654739.X for obtaining, by introducing absorption heat exchange unit, is repeatedly carried out to thermal source
Used with power source and heat exchange, improve the utilization ratio of steam source, be preferably user's heat supply；Steam double-effect is introduced to absorb
Formula heat pump, steam single-effective absorption heat pump, the big temperature difference absorption heat pump of steam, vapor-water heat exchanger reclaim low-grade heat step by step
Amount, effectively make use of the exhaust steam in steam turbine, improve efficiency of energy utilization.These patented technologies, have solved cooling tower
Used heat is wasted, and heat the once small problem of net supply backwater temperature difference.But also there is heating pipe network supply backwater temperature difference, an area of heat-supply service
The problems such as can still greatly improving, this technology uses multi-stage heat exchanger, absorption heat pump, compression refrigerating machine and ice making type refrigeration machine
The use in conjunction pipe network supply backwater temperature difference that will heat continues to widen, and fully reclaims condenser waste heat, and fuel combustion is slatterned
The matter of heat is effectively combined with the amount of cooling tower wasted heat, produces the effective heat energy for being suitable for heating of the existing matter amount of having again,
Expand area of heat-supply service, improve heating efficiency.
The content of the invention
Can not be fully utilized because grade is low for power plant cooling tower used heat, fuel (coal, oil, natural gas etc.) directly fires
Burn heat supply waste heat matter (fire use), pipe network supply backwater temperature difference of heating is small, circulating pump energy consumption is big, transfer efficiency is low,
The problems such as water return pipeline heat loss, limited existing heating network conveying capacity, will be heated a pipe network the invention provides one kind
Return water temperature is down to 0 DEG C and the energy-saving heating system that can significantly expand heat supplying scale containing 10% ice pellets.
The present invention for the technical scheme that is used of solution technical problem for：
Including steam power plant extraction for heat supply system, steam-condenser of thermal power plants cooling water system, Region Heating Station heat pump, heating
Pipe network, a heating secondary pipe network system.
A Region Heating Station side pipe network water supply of heating does driving heat source into absorption heat pump, and heat exchanger is entered after cooling
In exchanged heat with the backwater of heating secondary pipe network, the evaporator after heat exchange into absorption heat pump does low-temperature heat source, heating one
Secondary pipe network return water temperature is reduced to 15 DEG C；One stage of compression formula refrigeration machine is set again, and the pipe network return water temperature that will heat is reduced to 2
℃；One-level ice making type refrigeration machine is set again 2 DEG C of return water temperature is dropped into 0 DEG C and 10% ice pellets return power plant is produced；Absorb
The high temperature heat source of formula heat pump is the backwater of the heating secondary pipe network after once exchanging heat from heat exchanger out, and heat secondary pipe
The backwater of net is warming up to 50 DEG C of return user sides in absorption heat pump after second exchanges heat；Compression refrigerating machine and ice making
The backwater of 40 DEG C of the secondary pipe network that heats is heated to 50 DEG C of return user sides by the condenser side of type refrigeration machine.
Pipe network backwater of heating is exchanged heat by heat exchanger in steam power plant with steam-condenser of thermal power plants cooling water, reclaims steam power plant
Waste heat, then lifted temperature by steam type absorption heat pump, afterwards by steam water heat exchanger and steam turbine in thermal power plant draw gas into
Row heat exchange, obtains pipe network water supply of 110 DEG C of heating of conventional heat-supplying mode；The pipe network return water temperature that wherein heats was lifted
The driving heat source of steam type absorption heat pump is the high-temperature steam that steam turbine is extracted out in journey, and low-temperature heat source is that steam-condenser of thermal power plants is cold
But water.
The beneficial effects of the invention are as follows：
1st, condenser waste heat can to greatest extent be reclaimed with minimum cost, improves energy utilization rate；
2nd, heat a pipe network supply backwater temperature difference increase, reduces a pipe network circulating water flow, reduces circulating pump
Energy consumption；
3rd, the temperature of compression refrigerating machine output is very low, actually in the transformation process of market, can directly utilize market
In original refrigeration machine without in addition investment purchase heat pump, can both reduce investment outlay cost, can save space again, it is to avoid machine
Device leaves unused；
4th, the thermal source of can not extract absorption heat pump in the pipe network that heats 15 DEG C of compression refrigerating machine is again
Heat is put forward, the heat supply temperature difference is continued to widen, improve heating efficiency；
5th, pipe network backwater of heating of the system is used for 0 DEG C and containing 10% ice pellets, less than the earth temperature, along journey
Heat loss will not be produced；
6th, because pipe network backwater of heating is 0 DEG C and containing 10% ice pellets, along the used heat of many spot distributions of journey
Can add and, set up used heat energy recycling network.Absorbed heat of pipe network backwater intensification of heating is originally in cooling
Dispersed heat (condenser cooling residual heat) in tower, this section of heat is free.And the heat transfer process is straight with plate type heat exchanger
Connect what heat exchange was obtained, any other energy is not consumed；
7th, the system has reclaimed the heat that lost in cooling tower originally to greatest extent, greatly reduces cooling tower
Drift ice amount；
8th, conventional pipe network supply backwater temperature difference of heating is 60 DEG C, and the backwater of the system is 0 DEG C and containing 10% ice pellets,
System supply backwater temperature difference can reach 118 DEG C, along with the heat energy of Region Heating Station side absorption type heat pump assembly thermal source, equivalent to confession
Hot overall temperature difference reaches 160 DEG C~180 DEG C.This technology significantly increases the confession heat flow and the heat supply temperature difference of user side, improves
Pipe network transfer efficiency and heat supplying scale, reduce the investment of heating network, great for city energy-saving significance.In Downtown
Domain, Underground Space Resource is used up substantially while thermic load rapid growth, avoids brokenly road from constructing for the big temperature difference operation of backwater, the skill
Art will turn into the unique solution of pipe network dilatation；
9th, the extracted steam from turbine part that script is used as heat exchange is used for driving absorption heat pump to do work, the fuel that will be wasted
Fire use and the fire of cooling tower heat that wastes is without effectively combining, as the effective heat energy for being suitable for heating；
10th, heating process are a dynamic processes.In warm season initial stage and latter stage, heating demand is lower than heating peak value
40% or so, therefore be accomplished by reducing heat load at warm season initial stage and latter stage.This technology can be by adjusting quantity of circulating water
Or the regulation temperature difference adapts to the heat load requirement of different times.Regardless of regulative mode, steam turbine can be reduced
Draw gas, increase generated energy.
Brief description of the drawings
Fig. 1 is the schematic diagram of specific embodiment one；
In figure：1. steam turbine, 2. generator, 3. condenser, 4. cooling tower, 5. plate type heat exchanger, 6. steam double-effect absorb
Formula heat pump, 7. steam single-effective absorption heat pump, the 8. big temperature difference absorption heat pump of steam, 9. steam water heat exchanger, 10. absorption type heat
Pump, 11. heat exchangers, 12. compression refrigerating machines, 13. ice making type refrigeration machines, 14. user sides.
Specific embodiment
In Region Heating Station side, 110 DEG C of hot water of pipe network output of steam power plant's heating drive into absorption heat pump 10
Dynamic thermal source, enters the backwater in heat exchanger 11 with heating secondary pipe network and is exchanged heat after cooling, absorption heat pump is entered after heat exchange
10 evaporator does low-temperature heat source, and pipe network return water temperature of heating is reduced to 15 DEG C；User side recirculated water backwater is introduced into and changes
Hot device 11 once to be exchanged heat and be warming up to 45 DEG C by 40 DEG C, and the condenser side for entering back into absorption heat pump 10 carries out second heat exchange
50 DEG C of return user sides are warming up to by 45 DEG C；
The compression refrigerating machine 12 of Region Heating Station side is arranged on, is once managed with 15 DEG C of heating that absorption heat pump 10 is discharged
40 DEG C of heating secondary pipe network backwater is warming up to 50 DEG C of return user sides 14 by net backwater as low-temperature heat source, and heating is once managed
Net return water temperature is down to 2 DEG C；
The ice making type refrigeration machine 13 of Region Heating Station side is arranged on, is once managed with the heating discharged from compression refrigerating machine 12
2 DEG C pipe network backwater of heating is cooled to 0 DEG C and produces 10% ice pellets return thermoelectricity by net backwater as low-temperature heat source
40 DEG C of heating secondary pipe network backwater is warming up to 50 DEG C of return user sides 14 by factory, condenser side；
Weary gas in steam power plant side, steam turbine 1 is entered into condenser 3, and condenser cooling water is heated into 35 DEG C；0
DEG C and the pipe network backwater of heating containing 10% ice pellets carry out heat exchange into power plant's plate type heat exchanger 5 and condenser cooling water and rise
To 30 DEG C, 35 DEG C of condenser cooling water is cooled in 20 DEG C of return condensers 3 temperature；The steam type for being arranged on steam power plant side absorbs
Formula heat pump 6,7,8, driving heat source is done with the high-temperature steam that steam turbine is extracted out, using condenser cooling water as low-temperature heat source, will be for
Warm up a pipe network backwater and be heated to 90 DEG C；90 DEG C pipe network backwater of heating is taken out into steam water heat exchanger 9 and steam turbine 1
Vapour heat exchange is warming up to 110 DEG C as pipe network water supply output of heating.
The present invention is not limited to above-mentioned specific embodiment, any equivalent concepts in the technical scope of present disclosure
Or change, it is classified as protection scope of the present invention.
Claims (2)
1. a kind of energy-saving heating system for reducing heat supply return water temperature, including steam power plant extraction for heat supply system, steam-condenser of thermal power plants
Cooling water system, Region Heating Station heat pump, pipe network of heating, heating secondary pipe network system, it is characterised in that：
Region Heating Station side heat a pipe network water supply do driving heat source into absorption heat pump, after cooling enter heat exchanger in
The backwater of heating secondary pipe network is exchanged heat, and the evaporator after heat exchange into absorption heat pump does low-temperature heat source, and heating is once managed
Net return water temperature is reduced to 15 DEG C；One stage of compression formula refrigeration machine is set again, and the pipe network return water temperature that will heat is reduced to 2 DEG C；
One-level ice making type refrigeration machine is set again 2 DEG C of return water temperature is dropped into 0 DEG C and 10% ice pellets return power plant is produced；Absorption type heat
The high temperature heat source of pump is the backwater of the heating secondary pipe network after once exchanging heat from heat exchanger out, heating secondary pipe network
Backwater is warming up to 50 DEG C of return user sides in absorption heat pump after second exchanges heat；Compression refrigerating machine and ice making type system
The backwater of 40 DEG C of the secondary pipe network that heats is heated to 50 DEG C of return user sides by the condenser side of cold.
2. it is according to claim 1 it is a kind of reduce heat supply return water temperature energy-saving heating system, it is characterised in that：It includes
Steam power plant side at least one-level steam type absorption heat pump, Region Heating Station side at least first order absorption formula heat pump, one stage of compression formula system
Cold and one-level ice making type refrigeration machine；
In Region Heating Station side, 110 DEG C of hot water of pipe network output of steam power plant's heating do driving heat into absorption heat pump 10
Source, enters the backwater in heat exchanger 11 with heating secondary pipe network and is exchanged heat, into absorption heat pump 10 after heat exchange after cooling
Evaporator does low-temperature heat source, and pipe network return water temperature of heating is reduced to 15 DEG C；User side recirculated water backwater is introduced into heat exchanger
11 is once exchanged heat be warming up to 45 DEG C by 40 DEG C, and entering back into the condenser side of absorption heat pump 10 carries out second heat exchange by 45
DEG C it is warming up to 50 DEG C of return user sides；
The compression refrigerating machine 12 of Region Heating Station side is arranged on, is returned with pipe network of 15 DEG C of heating that absorption heat pump 10 is discharged
40 DEG C of heating secondary pipe network backwater is warming up to 50 DEG C of return user sides 14 by water as low-temperature heat source, and pipe network of heating is returned
Coolant-temperature gage is down to 2 DEG C；
The ice making type refrigeration machine 13 of Region Heating Station side is arranged on, is returned with the pipe network of heating discharged from compression refrigerating machine 12
2 DEG C pipe network backwater of heating is cooled to 0 DEG C and produces 10% ice pellets return steam power plant by water as low-temperature heat source, cold
40 DEG C of heating secondary pipe network backwater is warming up to 50 DEG C of return user sides 14 by condenser side；
Weary gas in steam power plant side, steam turbine 1 is entered into condenser 3, and condenser cooling water is heated into 35 DEG C；0 DEG C simultaneously
Pipe network backwater of heating containing 10% ice pellets carries out heat exchange and is warmed up into power plant's plate type heat exchanger 5 and condenser cooling water
30 DEG C, 35 DEG C of condenser cooling water is cooled in 20 DEG C of return condensers 3；It is arranged on the steam type absorption type heat of steam power plant side
Pump 6,7,8, driving heat source is done with the high-temperature steam that steam turbine is extracted out, using condenser cooling water as low-temperature heat source, will heat one
Secondary pipe network backwater is heated to 90 DEG C；90 DEG C pipe network backwater of heating is changed into steam water heat exchanger 9 with drawing gas for steam turbine 1
Heat is warming up to 110 DEG C as pipe network water supply output of heating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611242522.8A CN106705185A (en) | 2016-12-29 | 2016-12-29 | Energy-saving heat supply system with function of reducing temperature of heat supply return water |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611242522.8A CN106705185A (en) | 2016-12-29 | 2016-12-29 | Energy-saving heat supply system with function of reducing temperature of heat supply return water |
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| CN106705185A true CN106705185A (en) | 2017-05-24 |
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