CN106979545A - A kind of utilization heat pump extracts once the heating plant of net backwater heat - Google Patents
A kind of utilization heat pump extracts once the heating plant of net backwater heat Download PDFInfo
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- CN106979545A CN106979545A CN201710388918.1A CN201710388918A CN106979545A CN 106979545 A CN106979545 A CN 106979545A CN 201710388918 A CN201710388918 A CN 201710388918A CN 106979545 A CN106979545 A CN 106979545A
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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
- 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
- F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
-
- 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
- F24D2200/12—Heat pump
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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
Abstract
The present invention relates to the heating plant that a kind of utilization heat pump extracts once net backwater heat, it is characterized in that setting a heat pump, the secondary network side outlet of heat pump connects the water inlet of user terminal radiator by heat pump secondary network feed pipe, and the secondary network side-entrance of heat pump connects the delivery port of user terminal radiator by heat pump secondary network return pipe；Net side import of heat pump is by heat pump once net feed pipe connection once net return pipe, and once net return pipe is connected on once net return pipe and is located at heat pump once net feed pipe and the once downstream position of the tie point of net return pipe by heat pump for the net side outlet of heat pump；Heat pump once sets heat pump once net backwater pressure pump on net return pipe；Heat pump secondary network circulating pump is set on heat pump secondary network return pipe.The beneficial effects of the invention are as follows：The utilization of existing resource is improved, the energy is saved, cost of investment is reduced, increases economic efficiency.
Description
Technical field
The present invention relates to Heat Supply Engineering technical field, more particularly to the heat supply for utilizing heat pump to extract once net backwater heat
Stand.
Background technology
Continuing to develop and expand with city, the area of heat-supply service of urban heating system increases year by year, and Fig. 1 shows a city
Town central heating system, is the high-temperature water for producing the thermals source such as power plant or boiler room 1, and each use is transported to through once net feed pipe 2
Family heating plant 4, user's heating plant 4 extracts once the conventional heating plant of net water supply heat for conventional utilization heat exchanger.High temperature
Water is connected to a net side import of heat exchanger 6 through once net water inlet pipe 2, heat exchanger water inlet pipe 15, carries out after heat exchange, from
The net side outlet of heat exchanger, through heat exchanger, once net return pipe 16 returns to thermal source 1 by once net return pipe 3,
Circulated again after heating；In secondary net side, by heat exchanger 6 by the water heated up through heat exchange from the secondary net side of heat exchanger
Outlet is transported to the water inlet of user terminal radiator 8 through heat exchanger secondary network feed pipe 17, and by user terminal radiator 8
Delivery port entered by the secondary net side of heat exchanger secondary network return pipe 18 and the Returning heat-exchanger 6 of secondary network circulating pump 51
Mouthful, then heat exchange heating is carried out, it is achieved in system central heating.
But the area of heat-supply service of many heating systems has approached its maximum heat capacity at present, it is difficult to further increase heating-surface
Product, how further to excavate heat supply potentiality is heat supply unit problems faced.
The actual heat capacity of heating system is equal to the product of specific heat at constant pressure, circular flow and supply backwater temperature difference three,
That is Q=Cp*qm*△T.In the design of heating system, maximum heat capacity is for backwater temperature according to largest loop flow with maximum
What difference was designed.In actual motion, with the increase of heat user, heating system increases heat supply by increasing circular flow
Amount, when reaching largest loop flow, is limited by place capacities such as pipeline, water pumps, can not just continue to increase circular flow.
Exchange capability of heat and the limitation of the heating system method of operation due to heat transmission equipment, supply backwater temperature difference remain unchanged, the maximum of design
Supply backwater temperature difference is 60 DEG C, but the supply backwater temperature difference of actual motion is usual at 50 DEG C or so, less than maximum supply backwater temperature difference.Cause
This, when the actual motion flow of heating system reaches largest loop flow, the actual heating load of heating system just reaches maximum
It is worth, but because supply backwater temperature difference is less than maximum supply backwater temperature difference design load, causes the actual maximum heating load of heating system small
In the maximum heating load of design, the heat capacity of thermal source can not give full play to, and restrict the development of heating enterprise.Therefore, how to be directed to
Once net circulating water flow has reached design of pipe networks parameter, and a network operation supply backwater temperature difference is less than design parameter, and thermal source is supplied
Heat energy power fails situation about playing completely, and to this pipe network " at full capacity ", solution is not increasing pipe network flow, do not changing other
In the case of heat user operational factor, the problem of heat supply for further improving thermal source is exported, as industry concerned issue.
The content of the invention
It is a primary object of the present invention in view of the above-mentioned problems, providing a kind of utilization heat pump extracts once net backwater heat
Heating plant, by improving the supply backwater temperature difference of heating system, gives full play to heat supply ability, realization is not increasing pipe network stream
Amount, do not change other heat user operational factors in the case of, further improve thermal source heat supply output effect.
The technical solution adopted for the present invention to solve the technical problems is：
The present invention design philosophy be：Heating system is regard as net side thermal source of heat pump, Cong Zhongti using once net backwater
It is user's heat supply to take heat secondary network recirculated water, while user's heat demand is realized, reduces once net return water temperature,
Once net supply backwater temperature difference is widened, so that, in the case where not increasing pipe network flow, not changing other heat user operational factors,
Further improve the heat supply output of thermal source.
Concrete technical scheme is：
A kind of utilization heat pump extracts once the heating plant of net backwater heat, it is characterised in that set a heat pump, the heat pump
Secondary network side outlet pass through heat pump secondary network feed pipe connect user terminal radiator water inlet, the secondary network of the heat pump
Side-entrance connects the delivery port of user terminal radiator by heat pump secondary network return pipe；Net side import of heat pump passes through heat
Once net feed pipe connects once net return pipe to pump, and by heat pump, once net return pipe is connected to one for the net side outlet of heat pump
It is located at the downstream position of heat pump once net feed pipe and the once tie point of net return pipe on secondary net return pipe.
Heat pump once net backwater pressure pump is set on the heat pump once net return pipe.
Heat pump secondary network circulating pump is set on the heat pump secondary network return pipe.
The beneficial effects of the invention are as follows：The heating plant that a kind of utilization heat pump extracts once net backwater heat is provided, it is and existing
Technology ratio, by improving the supply backwater temperature difference of heating system, gives full play to heat supply ability, and reaching is not increasing pipe network stream
Amount, do not change other heat user operational factors in the case of, further improve thermal source heat supply output effect, make heat supply
" at full capacity " pipe network that ability fails to play completely further expands heat supplying scale.So as to improve the utilization of existing resource, save
The energy, reduces cost of investment, improves the economic benefit of heat supply department.
Brief description of the drawings
Fig. 1 is the structural representation of conventional central heating system；
Fig. 2 is the structure and the application schematic diagram in the conventional central heating system shown in Fig. 1 of the present invention.
In figure：
1 thermal source, 2 once net feed pipes, 3 once net return pipes, 4 extract once the normal of net water supply heat using heat exchangers
Rule heating plant, 51 heat exchanger secondary network circulating pumps, 52 heat pump secondary network circulating pumps, 6 heat exchangers, 7 extract one using heat pump
The heating plant of secondary net backwater heat, 8 user terminal radiators, 9 heat pumps once net backwater pressure pump, 10 heat pumps, 11 heat pumps are once
Net side return pipe, the 12 net side feed pipes of heat pump one time, 13 heat pump secondary network side outlets, 14 heat pump secondary network side-entrances, 15 heat are handed over
Net side feed pipe of parallel operation, the 16 net side return pipes of heat exchanger one time, the secondary net side feed pipe of 17 heat exchangers, 18 heat exchanges
The secondary net side return pipe of device, the outlet of 19 net sides of heat pump one time, the 20 net side imports of heat pump one time, the secondary net side feed pipe of 21 heat pumps,
The secondary net side return pipe of 22 heat pumps, the tie point of 23 heat pumps once net feed pipe and once net return pipe, 24 heat pumps are once netted back
The tie point of water pipe and once net return pipe.
Below in conjunction with drawings and examples to the detailed description of the invention.
Embodiment
Fig. 2 shows that the utilization heat pump that the present invention is provided extracts the once structure of the heating plant of net backwater heat and in Fig. 1
Application in shown conventional central heating system.
Show that a kind of utilization heat pump extracts once the heating plant 7 of net backwater heat in figure, it is characterised in that there is provided a heat
Pump 10, the secondary network side outlet 13 of the heat pump 10 connects user terminal radiator 8 by the secondary net side feed pipe 21 of heat pump
Water inlet, the secondary network side-entrance 14 of the heat pump 10 connects user terminal radiator 8 by the secondary network return pipe 22 of heat pump
Delivery port；By heat pump, once net water inlet pipe 12 connects once net return pipe 3 for net side import 20 of heat pump 10, heat pump
By heat pump, once net return pipe 11 is connected on once net return pipe 3 and is located at heat pump once net water inlet pipe for net side outlet 19
12 with the downstream position of the once tie point 23 of net return pipe 3, heat pump in such as figure once net return pipe 11 and once net backwater
The tie point 24 of pipe.
Heat pump once net backwater pressure pump 9 is set on above-mentioned heat pump once net return pipe 11.
Heat pump secondary network circulating pump 52 is set on above-mentioned heat pump secondary network return pipe 22.
The running that the above-mentioned heating plant for extracting once net backwater heat using heat pump carries out heat supply is as follows：
(1) net side of heat pumps:
1. part backwater is extracted from once net return pipe 3, once net feed pipe 12 is connected to heat pump once by heat pump 10
Net side import 20, into the evaporator of heat pump, heat pump work working medium is given in evaporator as thermal source heat release；
2. after once net backwater cools in heat pump, heat pump once net return pipe 11 is passed through from net side of heat pump outlet 19
By heat pump, once net backwater pressure pump 9 sends once net return pipe 3 back to, defeated backheat source 1 after being mixed with once net backwater.
(2) the secondary net side of heat pumps:
1. the secondary network backwater after the cooling of the user terminal radiator 8 in heat pump secondary network, from user terminal radiator
Delivery port, after heat pump secondary network circulating pump 52 pressurizes, by heat pump secondary network return pipe 22 from heat pump secondary network side-entrance 14
Into the condenser of heat pump, sorption type heat pump work working medium institute liberated heat within the condenser；
2. the user terminal radiator backwater after heating up, by heat pump secondary network side outlet 13 through heat pump secondary network feed pipe 21
The water inlet of access user terminal radiator 8；In the cooling of user terminal radiator, and so on circulate.
To meet system operation, heat pump once net force (forcing) pump lift, it is necessary to overcome damaged through pipeline in flow along journey
Lose, local losses and equipment internal loss, while should ensure that mixed with once net backwater after will not cause once net backwater countercurrently.Follow
The lift of ring pump reduces circulating pump lift if operating pressure value is higher than design load, such as transported according to the pressure value control at mixed water
Row pressure value then increases circulating pump lift less than design load.
The calculating process and principle of the heating system are as follows：
1. according to user side area of heat-supply service F and user side heating index q, user side thermic load Q is determined：
Q=F*q (1)
User side thermic load is heat pump heat supply amount Q.
2. according to heat pump net side inlet temperature t11With its secondary net side outlet/inlet temperature t21/t22, specific heat capacity
cp, calculate the secondary net side quantity of circulating water m of heat pump2：
m2=Q/cp/(t22-t21) (2)
3. heat pump type selecting is determined, and by net side of heating efficiency COP values and heat pump of heat-pump apparatus producer offer heat pump
Outlet temperature t12, according to heating efficiency COP values and heat pump heat supply amount Q, calculate net side caloric receptivity Q of heat pump1：
Q1=(COP-1) Q/COP (3)
Afterwards, the once net recycling water utilization amount m of net side of heat pump is determined1：
m1=Q1/cp/(t11-t12) (4)
4. the driving energy Q of heat pump is calculated2：
Q2=Q/COP (5)
According to driving energy Q2With heat pump type of drive, electrisity consumption, gas consumption or heat consumption are drawn.
5. by once net global cycle water m, once net confession/return water temperature t01/t11, heat pump is calculated by a net side
Once net return water temperature t after return pipe net mixing is transported in outlet11’：
t11'=[m1t12+(m-m1)t11]/m (6)
6. return water temperature t11' reduction cause pipe network heat capacity increase, gain of heat ratio be η：
η=(t11-t11’)/(t01-t11) * 100% (7)
7. when once net supply backwater temperature difference is widened to design parameter △ T, pipe network can increase area of heat-supply service FIncrease：
FIncrease=F* [△ T- (t01-t11)]/(t11-t11’) (8)
The definition of symbol in above-mentioned formula (1)-(8) and unit are as follows：
F- user side area of heat-supply service , ㎡；
Q- user side heating indexs, W/ ㎡；
Q- user sides thermic load and heat pump heat supply amount, W；
Q1Net side caloric receptivity of-heat pump, W；
Q2- heat pump driving energy, W；
t01- once net supply water temperature, DEG C；
t11- once net side inlet temperature of net return water temperature namely heat pump, DEG C；
t11Net side water outlet is transported to once net return water temperature after return pipe net is mixed by '-heat pump, DEG C；
t12Net side outlet temperature of-heat pump, DEG C；
t21- heat pump secondary network side-entrance temperature, DEG C；
t22- heat pump secondary network side outlet temperature, DEG C；
The heating efficiency of COP- heat pumps；
cp- specific heat at constant pressure, J/ (Kg* DEG C)；
M- once net global cycle water, m3/s；
m1The once net recycling water utilization amount of net side of-heat pump, m3/s；
m2The secondary net side quantity of circulating water of-heat pump, m3/s；
η-gain of heat ratio；
△ T- once net design supply backwater temperature difference, DEG C；
FIncrease- pipe network can increase area of heat-supply service , ㎡.
Concrete application example
By taking Tianjin cogeneration of heat and power pipe network as an example, the heating plant that net backwater heat is extracted once using heat pump is answered
With.The cogeneration of heat and power design of pipe networks heat capacity is gross heat input Q0=700MW, total area of heat-supply service F0=1,300 ten thousand m2, it is designed for
Backwater temperature difference=t01-t11=60 DEG C, design once net global cycle water m=10000t/h.By development for many years, actual fortune
Row pipe network maximum stream flow reaches 10000t/h, and actual confession/return water temperature is 100 DEG C/55 DEG C, and supply backwater temperature difference is 45 DEG C, is only
The 75% of design load, the heat capacity for still having 25% is not utilized.
The pipe network has a new heat user application heat, the m of area of heat-supply service F=47 ten thousand2, thermic load is 32.9MW, Nian Yongre
Measure as 25.33 ten thousand GJ.Because pipe network can not further increase flow, according to traditional heat supply mode, it is impossible to be user's heat supply.
Therefore, utilization heat pump shown in Fig. 2 is set up in above-mentioned cogeneration of heat and power pipe network extract once the heating plant 7 of net backwater heat and solve
The new heat user heat supply.
Calculated according to above-mentioned calculating process：
1. user side thermic load is heat pump heat supply amount Q=32.9MW.
2. net side inlet temperature t of heat pump11=55 DEG C, secondary network side-entrance temperature t21=60 DEG C, outlet temperature t22=
80 DEG C, specific heat capacity cp=4186.8J/ (Kg* DEG C).Thus secondary net side quantity of circulating water m is drawn2=Q/cp/(t22-t21)=
1414.7t/h。
3. this example selects gas absorption heat pump, its heating efficiency COP=1.7, and net side outlet temperature of heat pump is t12
=20 DEG C；Net side caloric receptivity Q of heat pump1=(COP-1) Q/COP=13.5MW, once net recycling water utilization amount m1=Q1/cp/
(t11-t12)=332.9t/h；
4. the driving that gas absorption heat pump needs energy Q2=Q/COP=19.4MW, i.e. gas consumption are
1997.7m3/h；
5. its net side water outlet is transported to once after net return pipe is mixed and once netted back by gas absorption heat pump
Coolant-temperature gage
t11'=[m1t12+(m-m1)t11]/m=53.7 DEG C；
6. gain of heat ratio η=(t11-t11’)/(t01-t11) * 100%=2.9%；
7. using gas absorption heat pump will once net supply backwater temperature difference is widened to design parameter △ T=60 DEG C when, pipe network
Area of heat-supply service F can be increasedIncrease=F* [△ T- (t01-t11)]/(t11-t11')=542.3 ten thousand m2；
According to above-mentioned actual operation, for the new heat user, once net backwater heat " is extracted using heat pump by newly-increased
Heating plant 7 " can continue by above-mentioned Tianjin cogeneration of heat and power pipe network heat supply.
In the present embodiment, heat pump 10 employs commercially available model BZ1200XI-R1 gas absorption heat pump；Heat pump is once
Net force (forcing) pump 9 employs model TP200-150/4 force (forcing) pump；Heat pump secondary network circulating pump 52 employs model TP250-
370/4 circulating pump.
The project extracts once net backwater heat using gas absorption heat pump is used for user heating heat, in declared working condition
During lower operation, heat pump is 332.9t/h using once net backwater maximum stream flow, its net side caloric receptivity 13.5MW, its once net
Side-entrance temperature is 55 DEG C, and a net side outlet temperature is 20 DEG C, and a net side water outlet is transported to once after the mixing of net water return pipeline 3
Once net return water temperature is down to 53.7 DEG C, with once netting former 55 DEG C of return water temperature than about 1.3 DEG C of reduction, that is, increases the defeated heat energy of pipe network
Power about 2.9%.From once net backwater middle age 10.4 ten thousand GJ of caloric receptivity, year 42 ten thousand stere of gas consumption, to heat user year heat supply
Measure up to 250,000 GJ.The project investment internal rate of return (IRR) 8.16%, capital financial internal rate of return (FIRR) can be realized by implementing the project
6.3%.Using the present invention, such as by the heat capacity of residue 25% all of the m of area of heat-supply service about 542.3 ten thousand can be increased2.It is aobvious
The utilization for improving existing resource is write, cost of investment is reduced, heat supply department economic benefit is improved.
It is described above, only it is the preferred embodiments of the present invention, not makees any formal to the structure of the present invention
Limitation.Every technical spirit according to the present invention makees single modification, equivalent variations and modification to above example, still falls within this
In the range of inventive technique scheme.
Claims (3)
1. a kind of utilization heat pump extracts once the heating plant of net backwater heat, it is characterised in that set a heat pump, the heat pump
Secondary network side outlet connects the water inlet of user terminal radiator, the secondary net side of the heat pump by heat pump secondary network feed pipe
Import connects the delivery port of user terminal radiator by heat pump secondary network return pipe；Net side import of heat pump passes through heat pump
Once net feed pipe connects once net return pipe, and by heat pump, once net return pipe is connected to once for the net side outlet of heat pump
It is located at the downstream position of heat pump once net feed pipe and the once tie point of net return pipe on net return pipe.
2. a kind of utilization heat pump according to claim 1 extracts once the heating plant of net backwater heat, it is characterised in that
The heat pump once sets heat pump once net backwater pressure pump on net return pipe.
3. a kind of utilization heat pump according to claim 1 or 2 extracts once the heating plant of net backwater heat, it is characterised in that
Heat pump secondary network circulating pump is set on the heat pump secondary network return pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710388918.1A CN106979545A (en) | 2017-05-26 | 2017-05-26 | A kind of utilization heat pump extracts once the heating plant of net backwater heat |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710388918.1A CN106979545A (en) | 2017-05-26 | 2017-05-26 | A kind of utilization heat pump extracts once the heating plant of net backwater heat |
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| Publication Number | Publication Date |
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ID=59342732
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| CN201710388918.1A Withdrawn CN106979545A (en) | 2017-05-26 | 2017-05-26 | A kind of utilization heat pump extracts once the heating plant of net backwater heat |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108506992A (en) * | 2018-04-26 | 2018-09-07 | 天津市热电设计院有限公司 | A kind of mixed water Heating Adjustment heat source extracting return water heat using heat pump |
| CN109589015A (en) * | 2018-11-29 | 2019-04-09 | 九阳股份有限公司 | A kind of water detection method of food processor |
| CN112944451A (en) * | 2021-04-15 | 2021-06-11 | 晟源高科(北京)科技有限公司 | Natural gas energy supplementing graded utilization system based on pressure isolation station and adjusting method |
| CN112984614A (en) * | 2021-03-04 | 2021-06-18 | 长春工程学院 | Method and device for regulating and controlling supply and return water temperature of heating system by using Carnot cooler |
| CN113375212A (en) * | 2021-05-17 | 2021-09-10 | 大唐吉林发电有限公司热力分公司 | High-efficient heat pump system that retrieves of central heating pipe network return water |
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| CN206803293U (en) * | 2017-05-26 | 2017-12-26 | 天津市热电设计院有限公司 | A kind of heating plant that net backwater heat is extracted once using heat pump |
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| RU2286465C1 (en) * | 2005-07-12 | 2006-10-27 | Общество с ограниченной ответственностью "Научно-производственное объединение "Энергосберегающие технологии" | Heat supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108506992A (en) * | 2018-04-26 | 2018-09-07 | 天津市热电设计院有限公司 | A kind of mixed water Heating Adjustment heat source extracting return water heat using heat pump |
| CN109589015A (en) * | 2018-11-29 | 2019-04-09 | 九阳股份有限公司 | A kind of water detection method of food processor |
| CN112984614A (en) * | 2021-03-04 | 2021-06-18 | 长春工程学院 | Method and device for regulating and controlling supply and return water temperature of heating system by using Carnot cooler |
| CN112944451A (en) * | 2021-04-15 | 2021-06-11 | 晟源高科(北京)科技有限公司 | Natural gas energy supplementing graded utilization system based on pressure isolation station and adjusting method |
| CN113375212A (en) * | 2021-05-17 | 2021-09-10 | 大唐吉林发电有限公司热力分公司 | High-efficient heat pump system that retrieves of central heating pipe network return water |
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Application publication date: 20170725 |