CN104089435B - Heat pump is utilized to reclaim the amount of energy saving defining method of circulating cooling water afterheat - Google Patents
Heat pump is utilized to reclaim the amount of energy saving defining method of circulating cooling water afterheat Download PDFInfo
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- CN104089435B CN104089435B CN201410310146.6A CN201410310146A CN104089435B CN 104089435 B CN104089435 B CN 104089435B CN 201410310146 A CN201410310146 A CN 201410310146A CN 104089435 B CN104089435 B CN 104089435B
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- 239000000498 cooling water Substances 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000002918 waste heat Substances 0.000 claims abstract description 14
- 230000009467 reduction Effects 0.000 claims abstract description 10
- 238000011084 recovery Methods 0.000 claims abstract description 5
- 239000003245 coal Substances 0.000 claims description 18
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 238000004458 analytical method Methods 0.000 abstract description 2
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 230000004048 modification Effects 0.000 abstract description 2
- 238000012986 modification Methods 0.000 abstract description 2
- 239000008400 supply water Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
Classifications
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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]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
-
- 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 present invention relates to a kind of amount of energy saving defining method utilizing heat pump to reclaim circulating cooling water afterheat, comprising step has: (1) heat pump absorbs the determination of waste heat amount from condenser recirculated cooling water; (2) determination of unit generation power reduction after condenser pressure is promoted; (3) heat pump is utilized to reclaim the determination of condenser circulating cooling water afterheat amount of energy saving. The present invention utilizes absorption heat pump to reclaim condenser circulating cooling water afterheat for heat hot net recirculated water, reduce the cold source energy of steam turbine, increase external heat supplied simultaneously, reduce coal-fired consumption, reaching energy-conservation object, the present invention is by systems analysis, successfully realizing the calculating utilizing heat pump to reclaim condenser circulating cooling water afterheat amount of energy saving, thinking is rigorous, computational science, the organic efficiency of waste heat and the process modification of waste heat recovery is all significant.
Description
Technical field
The invention belongs to thermal power generation field of energy-saving technology, especially a kind of amount of energy saving defining method utilizing heat pump to reclaim circulating cooling water afterheat.
Background technology
Steam turbine cold source energy is one of topmost loss in current thermal power plant therrmodynamic system, accounts for about the 40% of unit always heat absorption amount, and energy is not owing to making full use of and lose in vain greatly. Along with aggravation and increasingly strict energy-saving and emission-reduction and the environmental requirement of competition among enterprises, reduce steam turbine cold source energy further, fuel saving consumes, decreasing pollution discharges, utilize absorption heat pump that turbine condenser recirculated cooling water is carried out waste heat recovery, the external heat supplied of unit can be increased, the object of energy-saving and emission-reduction can be reached again. But complete method of calculation be there is no for the concrete numerical value of amount of energy saving utilizing absorption heat pump to reclaim condenser circulating cooling water afterheat.
Summary of the invention
It is an object of the invention to for the deficiencies in the prior art, and propose a kind of amount of energy saving defining method utilizing heat pump to reclaim circulating cooling water afterheat.
The present invention solves its technical problem and takes following technical scheme to realize:
A kind of amount of energy saving defining method utilizing heat pump to reclaim circulating cooling water afterheat, it is characterised in that comprise step as follows:
(1) heat pump absorbs the determination of waste heat amount from condenser recirculated cooling water; Determine that the formula used is:
My=Qout��Hout-Qin��Hin=Qout��f(Pout��Tout)-Qin��f(Pin��Tin)
In formula: MyFor the waste heat amount that heat pump absorbs from condenser recirculated cooling water, kW;Qin is condenser recirculated cooling water water supply flow, QoutFor condenser cooling water return flow, t/h, in systems in which Qin=Qout; HoutFor condenser cooling water return enthalpy, kJ/kg, it is possible to by its pressure PoutWith temperature ToutTable look-up and obtain; HinFor condenser recirculated cooling water water supply enthalpy, kJ/kg, it is possible to by its pressure PinWith temperature TinTable look-up and obtain;
(2) determination of unit generation power reduction after condenser pressure is promoted; Determine that formula is:
�� N=N �� (P1-P0)����
In formula: �� N is unit generation power reduction after lifting condenser pressure, kW; N is unit generation acc power, kW; P1For the condenser pressure after lifting, kPa; P0Condenser pressure during for normally running, kPa; �� is that condenser pressure changes the correction factor to set generator power influences, %/kPa;
(3) heat pump is utilized to reclaim the determination of condenser circulating cooling water afterheat amount of energy saving, it is determined that formula is:
G=(My����-��N����)��h
Wherein, utilize heat pump to reclaim condenser circulating cooling water afterheat amount of energy saving and represent with the form of standard coal,
In formula: G for utilize heat pump reclaim condenser circulating cooling water afterheat amount of energy saving, ton/year; �� is the average heat supply coal consumption of unit, g/MJ; �� is that unit is on average powered coal consumption, g/ (kW.h); H is unit year hours run number, hour.
And, in described step (1) formula, each data volume all comes from unit DCS system data in timing statistics section.
And, in described step (2) formula, the source of each data volume is respectively:
1. unit generation acc power N comes from unit DCS system data in timing statistics section;
2. the condenser pressure P after promoting1Come from unit DCS system data in timing statistics section;
Condenser pressure P when 3. normally running0Come from unit history run data;
4. the correction factor �� of set generator power influences is come from unit design specification sheets by condenser pressure change.
And, in described step (3) formula, the source of each data volume is respectively:
1. the average heat supply coal consumption �� of unit is historical statistical data;
2. the unit coal consumption �� that on average powers is historical statistical data;
3. unit year hours run number h is historical statistical data.
Advantage and the positively effect of the present invention be:
The present invention utilizes absorption heat pump to reclaim condenser circulating cooling water afterheat for heat hot net recirculated water, reduces the cold source energy of steam turbine, increases external heat supplied simultaneously, reduces coal-fired consumption, reaches energy-conservation object. The present invention is by systems analysis, successfully realizing the calculating utilizing heat pump to reclaim condenser circulating cooling water afterheat amount of energy saving, and thinking is rigorous, computational science, the organic efficiency of waste heat and the process modification of waste heat recovery is all significant.
Accompanying drawing explanation
Fig. 1 is that the present invention utilizes heat pump to reclaim condenser circulating cooling water afterheat system architecture schematic diagram.
Embodiment
The invention process being further described below in conjunction with accompanying drawing, following examples are descriptive, are not limited, can not limit protection scope of the present invention with this.
Utilizing heat pump to reclaim an amount of energy saving defining method for circulating cooling water afterheat, as shown in Figure 1, utilize heat pump to reclaim condenser circulating cooling water afterheat system and comprise condenser and heat pump, the step of this defining method is as follows:
(1) heat pump absorbs the determination of waste heat amount from condenser recirculated cooling water; Determine that the formula used is:
My=Qout��Hout-Qin��Hin=Qout��f(Pout��Tout)-Qin��f(Pin��Tin)
In formula: MyFor the waste heat amount that heat pump absorbs from condenser recirculated cooling water, kW;QinFor condenser recirculated cooling water water supply flow, QoutFor condenser cooling water return flow, t/h, as shown in Figure 1, Q in systems in whichin=Qout(QoutFor condenser cooling water return flow); HoutFor condenser cooling water return enthalpy, kJ/kg, it is possible to by its pressure PoutWith temperature ToutTable look-up and obtain (with function f (Pout, Tout) represent); HinFor condenser recirculated cooling water water supply enthalpy, kJ/kg, it is possible to by its pressure PinWith temperature TinTable look-up and obtain (with function f (Pin, Tin) represent),
In formula, the source of each data volume is respectively:
1. condenser recirculated cooling water water supply flow QinCome from unit DCS system data in timing statistics section;
2. condenser cooling water return pressure PoutCome from unit DCS system data in timing statistics section;
3. condenser cooling water return temperature ToutCome from unit DCS system data in timing statistics section;
4. condenser recirculated cooling water pressure of supply water PinCome from unit DCS system data in timing statistics section;
5. condenser recirculated cooling water supply water temperature TinCome from unit DCS system data in timing statistics section;
(2) determination of unit generation power reduction after condenser pressure is promoted; Determine that formula is:
The benefit of condenser circulating cooling water afterheat is reclaimed for improving heat pump, it is generally required to take the method improving condenser pressure (unit vacuum) to improve condenser cooling water return temperature, this measure can reduce set generator power under identical operating mode, and after promoting condenser pressure, unit generation power reduction calculation formula is as follows:
�� N=N �� (P1-P0)����
In formula: �� N is unit generation power reduction after lifting condenser pressure, kW; N is unit generation acc power, kW; P1For the condenser pressure after lifting, kPa; P0Condenser pressure during for normally running, kPa; �� is that condenser pressure changes the correction factor to set generator power influences, %/kPa.
In formula, the source of each data volume is respectively:
1. unit generation acc power N comes from unit DCS system data in timing statistics section;
2. the condenser pressure P after promoting1Come from unit DCS system data in timing statistics section;
Condenser pressure P when 3. normally running0Come from unit history run data;
4. the correction factor �� of set generator power influences is come from unit design specification sheets by condenser pressure change.
(3) heat pump is utilized to reclaim the determination of condenser circulating cooling water afterheat amount of energy saving, it is determined that formula is:
The heat pump recovery condenser circulating cooling water afterheat amount of energy saving that utilizes in the present invention represents with the form of standard coal,
G=(My����-��N����)��h
In formula: G for utilize heat pump reclaim condenser circulating cooling water afterheat amount of energy saving, ton/year; �� is the average heat supply coal consumption of unit, g/MJ; �� is that unit is on average powered coal consumption, g/ (kW.h); H is unit year hours run number, hour.
In calculation formula, the source of each data volume is respectively:
1. the average heat supply coal consumption �� of unit is historical statistical data;
2. the unit coal consumption �� that on average powers is historical statistical data;
3. unit year hours run number h is historical statistical data.
Example
For a concrete condenser recirculated cooling water water supply flow Qin=7800t/h; Condenser cooling water return pressure Pout=0.12MPa, return water temperature Tout=42.8 DEG C, condenser cooling water return Hout=179.3kJ/kg; Condenser recirculated cooling water pressure of supply water Pout=0.28MPa, supply water temperature Tout=16.7 DEG C, condenser recirculated cooling water water supply Hout=70.3kJ/kg, system, utilize the formulae discovery of step (1),
(1) heat pump absorbs the determination of waste heat amount from condenser recirculated cooling water;
My=Qout��Hout-Qin��Hin=Qout��f(POut,Tout)-Qin��f(PIn,Tin)
Through calculating, the waste heat amount that heat pump absorbs from condenser recirculated cooling water is 236166kW;
(2) determination of unit generation power reduction after condenser pressure is promoted; By following formulae discovery:
�� N=N �� (P1-P0)����
In formula: set generator power average value N=250000kW; Condenser pressure P after lifting1=9.5kPa; Condenser pressure P during normal operation0=4.1kPa; Condenser pressure change is to the correction factor ��=0.35%/kPa of set generator power influences.
Through calculating, after lifting condenser pressure, unit generation power reduction is 4725kW;
(3) heat pump is utilized to reclaim the determination of condenser circulating cooling water afterheat amount of energy saving; By following formulae discovery:
G=(My����-��N����)��h
In formula: the average heat supply coal consumption ��=40g/MJ of unit; Unit is on average powered coal consumption ��=340g/ (kW.h); Unit year hours run number h=2800 hour.
Through calculating, utilize heat pump to reclaim condenser circulating cooling water afterheat and save mark amount G=2850 ton/year, coal.
Claims (4)
1. one kind utilizes the amount of energy saving defining method of heat pump recovery circulating cooling water afterheat, it is characterised in that comprise step as follows:
(1) heat pump absorbs the determination of waste heat amount from condenser recirculated cooling water; Determine that the formula used is:
My=Qout��Hout-Qin��Hin=Qout��f(Pout, Tout)-Qin��f(Pin, Tin)
In formula: MyFor the waste heat amount that heat pump absorbs from condenser recirculated cooling water, kW; QinFor condenser recirculated cooling water water supply flow, t/h, QoutFor condenser cooling water return flow, t/h, in systems in which Qin=Qout, HoutFor condenser cooling water return enthalpy, kJ/kg, it is possible to by its pressure PoutWith temperature ToutTable look-up and obtain; HinFor condenser recirculated cooling water water supply enthalpy, kJ/kg, it is possible to by its pressure PinWith temperature TinTable look-up and obtain;
(2) determination of unit generation power reduction after condenser pressure is promoted; Determine that formula is:
�� N=N �� (P1-P0)����
In formula: �� N is unit generation power reduction after lifting condenser pressure, kW; N is unit generation acc power, kW; P1For the condenser pressure after lifting, kPa; P0Condenser pressure during for normally running, kPa; �� is that condenser pressure changes the correction factor to set generator power influences, %/kPa;
(3) heat pump is utilized to reclaim the determination of condenser circulating cooling water afterheat amount of energy saving, it is determined that formula is:
G=(My����-��N����)��h
Wherein, utilize heat pump to reclaim condenser circulating cooling water afterheat amount of energy saving and represent with the form of standard coal,
In formula: G for utilize heat pump reclaim condenser circulating cooling water afterheat amount of energy saving, ton/year; �� is the average heat supply coal consumption of unit, g/MJ; �� is that unit is on average powered coal consumption, g/ (kW.h); H is unit year hours run number, hour.
2. the amount of energy saving defining method utilizing heat pump to reclaim circulating cooling water afterheat according to claim 1, it is characterised in that: in described step (1) formula, each data volume all comes from unit DCS system data in timing statistics section.
3. the amount of energy saving defining method utilizing heat pump to reclaim circulating cooling water afterheat according to claim 1, it is characterised in that: in described step (2) formula, the source of each data volume is respectively:
1. unit generation acc power N comes from unit DCS system data in timing statistics section;
2. the condenser pressure P after promoting1Come from unit DCS system data in timing statistics section;
Condenser pressure P when 3. normally running0Come from unit history run data;
4. the correction factor �� of set generator power influences is come from unit design specification sheets by condenser pressure change.
4. the amount of energy saving defining method utilizing heat pump to reclaim circulating cooling water afterheat according to claim 1, it is characterised in that: in described step (3) formula, the source of each data volume is respectively:
1. the average heat supply coal consumption �� of unit is historical statistical data;
2. the unit coal consumption �� that on average powers is historical statistical data;
3. unit year hours run number h is historical statistical data.
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| CN105825285B (en) * | 2015-01-08 | 2019-11-19 | 国家电网公司 | A kind of heat-engine plant circulating water source absorption type heat pump energy-conserving amount determines method |
| CN109740235B (en) * | 2018-12-28 | 2022-11-29 | 新奥数能科技有限公司 | Method and device for determining coal saving amount of coal-fired boiler, readable medium and electronic equipment |
| CN110544183A (en) * | 2019-09-19 | 2019-12-06 | 国网天津市电力公司电力科学研究院 | combined heat and power generation unit recovery waste heat benefit calculation method based on absorption heat pump |
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| JP2007064048A (en) * | 2005-08-30 | 2007-03-15 | Hitachi Eng Co Ltd | Waste heat recovery facility of power plant |
| CN201836967U (en) * | 2010-10-26 | 2011-05-18 | 北京国电电科院节能技术有限公司 | Cogeneration energy saving device utilizing waste heat of direct air cooling unit for heat supply |
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| JP2007064048A (en) * | 2005-08-30 | 2007-03-15 | Hitachi Eng Co Ltd | Waste heat recovery facility of power plant |
| CN201836967U (en) * | 2010-10-26 | 2011-05-18 | 北京国电电科院节能技术有限公司 | Cogeneration energy saving device utilizing waste heat of direct air cooling unit for heat supply |
| CN203010751U (en) * | 2012-12-25 | 2013-06-19 | 李同强 | Heat-supply device utilizing waste heat of biomass power plant |
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Address after: 300010 Tianjin city Hebei District Wujing Road No. 39 Applicant after: State Grid Corporation of China Applicant after: State Grid Tianjin Electric Power Company Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant before: State Grid Corporation of China Applicant before: State Grid Tianjin Electric Power Company |
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