CN110005488A - A kind of high back pressure energy saving in heating system optimization method - Google Patents
A kind of high back pressure energy saving in heating system optimization method Download PDFInfo
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- CN110005488A CN110005488A CN201910135405.9A CN201910135405A CN110005488A CN 110005488 A CN110005488 A CN 110005488A CN 201910135405 A CN201910135405 A CN 201910135405A CN 110005488 A CN110005488 A CN 110005488A
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- 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
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
-
- 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
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
-
- 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
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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]
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The present invention relates to a kind of high back pressure energy saving in heating system optimization method, heating system includes high back pressure thermal power plant unit, No.1 steam extraction heat supply unit, No. two steam extraction heat supply units, Gateway Station in Heating Network heat exchanger, industrial heating user terminal, resident's heating user terminal；High back pressure thermal power plant unit, No.1 steam extraction heat supply unit and No. two steam extraction heat supply units are cogeneration units, carry out power generation and heat supply simultaneously according to the electrical load requirement of power grid and the thermal load demands of heat supply network；Gateway Station in Heating Network heat exchanger is steam water heat exchanger, and vapour side is connected with the extraction for heat supply pipeline of No.1 steam extraction heat supply unit and No. two steam extraction heat supply units, and water side is connected with the recirculated water of high back pressure thermal power plant unit；Industrial heating user terminal demand is high-temperature steam, by No.1 steam extraction heat supply unit and No. two steam extraction heat supply unit heat supplies；Resident's heating user terminal demand is high-temperature-hot-water, by the heat supply after the heating of Gateway Station in Heating Network heat exchanger of high back pressure thermal power plant unit, No.1 steam extraction heat supply unit and No. two steam extraction heat supply units.
Description
Technical field
The present invention relates to cogeneration of heat and power technical field, especially a kind of high back pressure energy saving in heating system optimization method.
Background technique
High back pressure series connection extraction for heat supply system is a kind of heat supply that North China's cogeneration units generally use in recent years
System can both make full use of the advantage that high back pressure thermal power plant unit cold source energy is zero, can also be negative according to the heat of heat supply user
Lotus demand, the steam extraction amount by controlling steam extraction heat supply unit adjust external heating load.The heating system can give full play to highback
Press thermal power plant unit and steam extraction heat supply unit advantage, flexibly meet the needs of heat supply user, such as application No. is
201810984137.3 Chinese patent, but high back pressure thermal power plant unit is externally supplied with more different types of thermal power plant unit series connection
When hot, because there are difference for the operation characteristic and economy of different thermal power plant units, when thermal power plant unit electric load, heating parameter, industry
It, will if more thermal power plant units cannot be reasonably adjusted according to its operation characteristic when the operating conditions such as heat supply user demand change
Cause the waste of energy.
Summary of the invention
It is an object of the invention to overcome above-mentioned deficiency present in current high back pressure series connection extraction for heat supply system, one is provided
Kind high back pressure energy saving in heating system optimization method is joined with solving thermal power plant unit thermoelectricity in power grid electric load and heat supply network load variations
Produce the higher problem of units consumption.
Technical solution used by the present invention solves the above problems is: the high back pressure energy saving in heating system optimization method,
Be characterized in that: heating system includes: high back pressure thermal power plant unit, No.1 steam extraction heat supply unit, No. two steam extraction heat supply units, heat supply network head
It stands heat exchanger, industrial heating user terminal, resident heats user terminal；The high back pressure thermal power plant unit, No.1 steam extraction heat supply unit
With No. two steam extraction heat supply units be cogeneration units, according to power grid electrical load requirement and heat supply network thermal load demands simultaneously into
Row power generation and heat supply；The Gateway Station in Heating Network heat exchanger is steam water heat exchanger, vapour side and No.1 steam extraction heat supply unit and No. two pumpings
The extraction for heat supply pipeline of vapour thermal power plant unit is connected, and water side is connected with the recirculated water of high back pressure thermal power plant unit；The industrial heating
User terminal demand is high-temperature steam, by No.1 steam extraction heat supply unit and No. two steam extraction heat supply unit heat supplies；Resident's heating
User terminal demand is high-temperature-hot-water, by high back pressure thermal power plant unit, No.1 steam extraction heat supply unit and No. two steam extraction heat supply units through heat
Net heat supply after initial station heat exchanger heats；
When the variation of power grid electrical load requirement, the economy after analysis high back pressure thermal power plant unit electric load variation is calculated,
Determine that high back pressure thermal power plant unit electric load changes the influence to heating system economy；
When the variation of power grid electrical load requirement, comparison No.1 steam extraction heat supply unit and No. two steam extraction heat supply unit economy are calculated
Property difference, determine that grid requirements unit mediates or when peak load regulation, No.1 steam extraction heat supply unit and No. two extraction for heat supply machines
The sequencing of group electric load adjustment；
When resident's heating user terminal heat demand changes, according to the difference of thermal power plant unit economy, heat supply is determined
The sequencing of unit heating parameter adjustment；
When industrial heating user terminal heat demand changes, according to the difference of thermal power plant unit economy, heat supply is determined
The sequencing of unit heating parameter adjustment.
The calculation formula of high back pressure thermal power plant unit economy are as follows:Wherein, H is heat consumption rate, and Q is boiler caloric receptivity,
P is generator power.
The calculation formula of No.1 steam extraction heat supply unit and No. two steam extraction heat supply unit economy are as follows:Its
In, H is heat consumption rate, and Q is boiler caloric receptivity, and P is generator power, QfFor extraction for heat supply amount.
The calculation formula of boiler caloric receptivity Q is Q=Gfw(hms-hfw)+Grh(hhr-hcr)；Wherein, GfwFor boiler feedwater stream
Amount, hmsFor boiler export main steam specific enthalpy, hfwFor boiler feedwater specific enthalpy, Grh is reheated steam flow, hhrFor hot steam ratio again
Enthalpy, hcrFor cold specific steam enthalpy again.
Compared with prior art, the present invention having the following advantages that and effect: the present invention is directed to electrical load requirement and thermic load
The case where demand real-time change, has invented a kind of high back pressure heat supply and the energy conservation of heating system that steam extraction heat supply unit is composed in series
Method is optimized and revised, solves the externally power generation and when heat supply jointly of different types of cogeneration units, because of operation characteristic and warp
The problem that Ji characteristic difference causes energy consumption higher.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention.
In figure: 1- high back pressure thermal power plant unit；2- No.1 steam extraction heat supply unit；No. bis- steam extraction heat supply units of 3-；4- heat supply network is first
It stands heat exchanger；5- industrial heating user terminal；6- resident's heating user terminal.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing and by embodiment, and following embodiment is to this hair
Bright explanation and the invention is not limited to following embodiments.
Embodiment.
Referring to Fig. 1, high back pressure energy saving in heating system optimization method in the present embodiment, heating system includes: that high back pressure supplies
Heat engine group 1, No.1 steam extraction heat supply unit 2, No. two steam extraction heat supply units 3, Gateway Station in Heating Network heat exchanger 4, industrial heating user terminal 5,
Resident's heating user terminal 6；High back pressure thermal power plant unit 1, No.1 steam extraction heat supply unit 2 and No. two steam extraction heat supply units 3 are thermoelectricity connection
Unit is produced, carries out power generation and heat supply simultaneously according to the electrical load requirement of power grid and the thermal load demands of heat supply network；Gateway Station in Heating Network heat exchange
Device 4 is steam water heat exchanger, the extraction for heat supply pipeline phase of vapour side and No.1 steam extraction heat supply unit 2 and No. two steam extraction heat supply units 3
Even, water side is connected with the recirculated water of high back pressure thermal power plant unit 1；5 demand of industrial heating user terminal is high-temperature steam, by No.1 steam extraction
Thermal power plant unit 2 and No. two 3 heat supplies of steam extraction heat supply unit；Resident's heating 6 demand of user terminal is high-temperature-hot-water, by high back pressure heat supply machine
The heat supply after the heating of Gateway Station in Heating Network heat exchanger 4 of group 1, No.1 steam extraction heat supply unit 2 and No. two steam extraction heat supply units 3；
When the variation of power grid electrical load requirement, the economy after analysis 1 electric load of high back pressure thermal power plant unit variation is calculated,
Determine that 1 electric load of high back pressure thermal power plant unit changes the influence to heating system economy；
When the variation of power grid electrical load requirement, calculates comparison No.1 steam extraction heat supply unit 2 and No. two steam extraction heat supply units 3 pass through
The difference of Ji property, when determining the mediation of grid requirements unit or peak load regulation, No.1 steam extraction heat supply unit 2 and No. two extraction for heat supply
The sequencing of 3 electric load of unit adjustment；
When resident's heating 6 heat demand of user terminal changes, according to the difference of thermal power plant unit economy, heat supply is determined
The sequencing of unit heating parameter adjustment；
When 5 heat demand of industrial heating user terminal changes, according to the difference of thermal power plant unit economy, heat supply is determined
The sequencing of unit heating parameter adjustment.
In the present embodiment, the energy conservation optimizing method of high back pressure heating system, steps are as follows:
Calculate economy when 1 variable working condition of high back pressure thermal power plant unit, calculation formula are as follows:Wherein, H is heat consumption rate,
Q is boiler caloric receptivity, and P is generator power.The calculation formula of boiler caloric receptivity Q is Q=Gfw(hms-hfw)+Grh(hhr-hcr)；
Wherein, GfwFor boiler feedwater flow, hmsFor boiler export main steam specific enthalpy, hfwFor boiler feedwater specific enthalpy, Grh is reheated steam
Flow, hhrFor hot specific steam enthalpy again, hcrFor cold specific steam enthalpy again.
According to calculated result, determine the variation of 1 electric load of high back pressure thermal power plant unit to the shadow of high back pressure heating system economy
It rings, and according to the demand of power grid electric load, industrial heating user terminal 5 and resident heating user terminal 6, determines high back pressure heating system
Optimization sequence.
After the variation of 1 electric load of high back pressure thermal power plant unit, 1 heat consumption situation of change of high back pressure thermal power plant unit is as shown in table 1.
Heat consumption situation of change when the active variation of 1 high back pressure thermal power plant unit of table
It can be seen from Table 1 that index situation of change when 1 electric load 125MW and 100MW of high back pressure thermal power plant unit is,
Heat consumption rate increases 428.84kJ/kWh, and 1 electric load of high back pressure thermal power plant unit is higher, and unit efficiency is higher, high pressure cylinder and middle pressure
The efficiency of cylinder is also higher, the acting ability enhancing of steam turbine.
Calculate the calculation formula of No.1 steam extraction heat supply unit 2 and No. two 3 economy of steam extraction heat supply unit are as follows:Wherein, H is heat consumption rate, and Q is boiler caloric receptivity, and P is generator power, QfFor extraction for heat supply amount.Boiler is inhaled
The calculation formula of heat Q is Q=Gfw(hms-hfw)+Grh(hhr-hcr)；Wherein, GfwFor boiler feedwater flow, hmsGo out for boiler
Mouth main steam specific enthalpy, hfwFor boiler feedwater specific enthalpy, Grh is reheated steam flow, hhrFor hot specific steam enthalpy again, hcrIt is steamed again to be cold
Vapour specific enthalpy.
According to calculated result, the difference of No.1 steam extraction heat supply unit 2 and No. two 3 economy of steam extraction heat supply unit is determined, and
According to the demand of power grid electric load, resident heating user terminal and industrial heating user terminal 5,2 He of No.1 steam extraction heat supply unit is determined
The optimization sequence of No. two steam extraction heat supply units 3.
When No.1 steam extraction heat supply unit 2 and No. two 3 identical electric loads of steam extraction heat supply unit, thermal power plant unit heat consumption situation such as table
Shown in 2.
Heat consumption situation when 2 No.1 steam extraction heat supply unit of table and No. two steam extraction heat supply units identical electric load
It can be seen from Table 2 that when No.1 steam extraction heat supply unit 2 and No. two 3 identical electric loads of steam extraction heat supply unit, No.1
The heat consumption rate of steam extraction heat supply unit 2 is 150.62kJ/kWh higher than the heat consumption rate of No. two steam extraction heat supply units 3, illustrates No.1 steam extraction
When thermal power plant unit 2 and No. two 3 series operations of steam extraction heat supply unit, the economy of No. two steam extraction heat supply units 3 is more preferable.
According to the above high back pressure thermal power plant unit 1, No.1 steam extraction heat supply unit 2 and No. two 3 power transformation loads of steam extraction heat supply unit
The situation of change of unit economy when operating condition, energy saving optimizing sequence when high back pressure heating system variable working condition are as follows:
High back pressure thermal power plant unit 1 does not have cold source energy, preferential to distribute high back pressure heat supply in the distribution of heating system electric load
Unit 1, reallocation No.1 steam extraction heat supply unit 2 and No. two steam extraction heat supply units 3,1 electric load of high back pressure thermal power plant unit should be kept
Highest.
When the heat consumption rate of No. two steam extraction heat supply units 3 is low, to No.1 steam extraction heat supply unit 2 and No. two steam extraction heat supply units 3
It is preferential to distribute No. two low steam extraction heat supply units 3 of heat consumption when electric load distributes.
When the heat consumption rate of No.1 steam extraction heat supply unit 2 is high, No.1 steam extraction heat supply unit 2 and No. two steam extraction heat supply units 3 are joined
When mediating with power grid, the No.1 steam extraction heat supply unit 2 for preferentially allowing the thermal efficiency high participates in mediating.
When the heat consumption rate of No. two steam extraction heat supply units 3 is low, and resident's heating user terminal 6 needs to increase heating load, preferential point
With No. two low steam extraction heat supply units 3 of heat consumption, increase the throttle flow of No. two steam extraction heat supply units 3 to Gateway Station in Heating Network heat exchanger 4.
The high pressure cylinder and IP efficiency height of No. two steam extraction heat supply units 3, illustrate No. two 3 high pressure cylinders of steam extraction heat supply unit rows
Vapour parameter is low, preferential to distribute No. two low steam extraction heat supply units 3 of heat consumption when industrial heating user terminal 5 needs to increase heating load,
Increase the evaporation capacity for engine of No. two steam extraction heat supply units 3 to industrial heating user terminal 5.
It is any to be familiar with although the present invention is disclosed as above with embodiment, its protection scope being not intended to limit the invention
The technical staff of this technology changes and retouches made without departing from the spirit and scope of the invention, should belong to this hair
Bright protection scope.
Claims (4)
1. a kind of high back pressure energy saving in heating system optimization method, it is characterised in that: heating system includes: high back pressure thermal power plant unit
(1), No.1 steam extraction heat supply unit (2), No. two steam extraction heat supply units (3), Gateway Station in Heating Network heat exchanger (4), industrial heating user terminal
(5), resident heats user terminal (6)；High back pressure thermal power plant unit (1), No.1 steam extraction heat supply unit (2) and No. two steam extractions supply
Heat engine group (3) be cogeneration units, according to power grid electrical load requirement and heat supply network thermal load demands simultaneously carry out power generation and
Heat supply；The Gateway Station in Heating Network heat exchanger (4) is steam water heat exchanger, vapour side and No.1 steam extraction heat supply unit (2) and No. two steam extractions
The extraction for heat supply pipeline of thermal power plant unit (3) is connected, and water side is connected with the recirculated water of high back pressure thermal power plant unit (1)；The industry
Heat supply user end (5) demand is high-temperature steam, by No.1 steam extraction heat supply unit (2) and No. two steam extraction heat supply unit (3) heat supplies；Institute
The resident that states user terminal (6) demand that heats is high-temperature-hot-water, by high back pressure thermal power plant unit (1), No.1 steam extraction heat supply unit (2) and
The heat supply after Gateway Station in Heating Network heat exchanger (4) are heated of No. two steam extraction heat supply units (3)；
When the variation of power grid electrical load requirement, the economy after analysis high back pressure thermal power plant unit (1) electric load variation is calculated, really
Determine influence of high back pressure thermal power plant unit (1) the electric load variation to heating system economy；
When the variation of power grid electrical load requirement, comparison No.1 steam extraction heat supply unit (2) and No. two steam extraction heat supply unit (3) warps are calculated
The difference of Ji property, when determining the mediation of grid requirements unit or peak load regulation, No.1 steam extraction heat supply unit (2) and No. two steam extractions are supplied
The sequencing of heat engine group (3) electric load adjustment；
When resident's heating user terminal (6) heat demand changes, according to the difference of thermal power plant unit economy, heat supply machine is determined
The sequencing of group heating parameter adjustment；
When industrial heating user terminal (5) heat demand changes, according to the difference of thermal power plant unit economy, heat supply machine is determined
The sequencing of group heating parameter adjustment.
2. high back pressure energy saving in heating system optimization method according to claim 1, it is characterised in that: high back pressure thermal power plant unit
(1) calculation formula of economy are as follows:Wherein, H is heat consumption rate, and Q is boiler caloric receptivity, and P is generator power.
3. high back pressure energy saving in heating system optimization method according to claim 1, it is characterised in that: No.1 extraction for heat supply machine
The calculation formula of group (2) and No. two steam extraction heat supply unit (3) economy are as follows:Wherein, H is heat consumption rate, and Q is pot
Furnace caloric receptivity, P is generator power, QfFor extraction for heat supply amount.
4. high back pressure energy saving in heating system optimization method according to claim 2 or 3, it is characterised in that: boiler caloric receptivity Q
Calculation formula be Q=Gfw(hms-hfw)+Grh(hhr-hcr)；Wherein, GfwFor boiler feedwater flow, hmsFor the main steaming of boiler export
Vapour specific enthalpy, hfwFor boiler feedwater specific enthalpy, Grh is reheated steam flow, hhrFor hot specific steam enthalpy again, hcrFor cold specific steam enthalpy again.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111047168A (en) * | 2019-12-02 | 2020-04-21 | 国网河北省电力有限公司电力科学研究院 | Peak regulation capacity evaluation method after high-back-pressure heat supply reconstruction of heat supply unit |
| CN111287811A (en) * | 2020-03-31 | 2020-06-16 | 西安西热节能技术有限公司 | Vacuum online optimization method for optimal operation of high-backpressure step heating unit |
| CN113074402A (en) * | 2021-04-16 | 2021-07-06 | 太原理工大学 | High-back-pressure heat supply optimization method for thermoelectric unit |
| CN114562718A (en) * | 2022-01-26 | 2022-05-31 | 西安热工研究院有限公司 | Optimal control method and device for cogeneration unit and storage medium |
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| CN109118017A (en) * | 2018-09-03 | 2019-01-01 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Thermic load optimizing distribution method, electronic equipment and storage medium |
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| CN102519067A (en) * | 2011-12-21 | 2012-06-27 | 华北电力大学 | Heating energy saving device with additional back pressure generator for extraction condensing unit and heating energy saving method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111047168A (en) * | 2019-12-02 | 2020-04-21 | 国网河北省电力有限公司电力科学研究院 | Peak regulation capacity evaluation method after high-back-pressure heat supply reconstruction of heat supply unit |
| CN111047168B (en) * | 2019-12-02 | 2023-05-30 | 国网河北省电力有限公司电力科学研究院 | Peak regulating capability assessment method for heat supply unit after high back pressure heat supply transformation |
| CN111287811A (en) * | 2020-03-31 | 2020-06-16 | 西安西热节能技术有限公司 | Vacuum online optimization method for optimal operation of high-backpressure step heating unit |
| CN113074402A (en) * | 2021-04-16 | 2021-07-06 | 太原理工大学 | High-back-pressure heat supply optimization method for thermoelectric unit |
| CN113074402B (en) * | 2021-04-16 | 2022-07-19 | 太原理工大学 | High-back-pressure heat supply optimization method for thermoelectric unit |
| CN114562718A (en) * | 2022-01-26 | 2022-05-31 | 西安热工研究院有限公司 | Optimal control method and device for cogeneration unit and storage medium |
| CN114562718B (en) * | 2022-01-26 | 2023-09-01 | 西安热工研究院有限公司 | Optimal control method and device for cogeneration unit and storage medium |
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