CN116658267A - Solar-assisted cogeneration system and operation method - Google Patents
Solar-assisted cogeneration system and operation method Download PDFInfo
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- CN116658267A CN116658267A CN202310645993.7A CN202310645993A CN116658267A CN 116658267 A CN116658267 A CN 116658267A CN 202310645993 A CN202310645993 A CN 202310645993A CN 116658267 A CN116658267 A CN 116658267A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000001105 regulatory effect Effects 0.000 claims abstract description 128
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 119
- 238000010521 absorption reaction Methods 0.000 claims abstract description 39
- 239000002918 waste heat Substances 0.000 claims abstract description 25
- 238000005338 heat storage Methods 0.000 claims abstract description 20
- 230000005611 electricity Effects 0.000 claims abstract description 6
- 238000011084 recovery Methods 0.000 claims abstract description 5
- 230000001172 regenerating effect Effects 0.000 claims description 64
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 11
- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 239000006096 absorbing agent Substances 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 238000010248 power generation Methods 0.000 abstract description 11
- 238000010438 heat treatment Methods 0.000 abstract description 9
- 238000009833 condensation Methods 0.000 abstract description 4
- 230000005494 condensation Effects 0.000 abstract description 4
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 6
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
Classifications
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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
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
- F03G6/068—Devices for producing mechanical power from solar energy with solar energy concentrating means having other power cycles, e.g. Stirling or transcritical, supercritical cycles; combined with other power sources, e.g. wind, gas or nuclear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/071—Devices for producing mechanical power from solar energy with energy storage devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/092—Devices for producing mechanical power from solar energy using heat pumps, e.g. solar assisted heat pumps
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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
- F24D18/00—Small-scale combined heat and power [CHP] generation systems specially adapted for domestic heating, space heating or domestic hot-water supply
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/002—Machines, plants or systems, using particular sources of energy using solar energy
- F25B27/007—Machines, plants or systems, using particular sources of energy using solar energy in sorption type systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/04—Heat pumps of the sorption type
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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
- F24D2101/00—Electric generators of small-scale CHP systems
- F24D2101/10—Gas turbines; Steam engines or steam turbines; Water turbines, e.g. located in water pipes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
A solar energy auxiliary cogeneration system and an operation method thereof, wherein the system comprises a boiler, a turbine high-middle-low pressure cylinder, a condenser and a heat recovery system which are sequentially communicated; the solar energy heat collection system also comprises a groove type solar energy heat collection system, a high-low temperature heat storage tank, an oil-water heat exchanger, a peak heater, a waste heat heater, an auxiliary heater, an absorption heat pump, various valves and the like. In the daytime, the peak power supply and low valley period adopts a solar energy to drive an absorption heat pump and a peak heater, and the waste heat of steam exhaust of a steam turbine and backwater of a heat supply network is recovered, so that the power generation output of the steam turbine is increased in an auxiliary way on the premise of meeting the heat supply load; the excess solar heat is stored by the hot tank. At night, in the peak period of electricity low-valley heat supply, the high-temperature tank releases heat to drive the absorption heat pump and the peak heater to recover the exhaust steam of the steam turbine and the backwater waste heat of the heat supply network, so that the heat supply network heat supply system is used for supplying heat to the heat supply network. The invention realizes the pure condensation working condition operation of the heating season cogeneration unit, greatly improves the power output of the unit in the power peak period, and obviously improves the peak regulating capability.
Description
Technical Field
The invention relates to the technical fields of cogeneration, power station peak shaving and solar photo-thermal utilization, in particular to a solar auxiliary cogeneration system and an operation method.
Background
The new energy power generation such as solar energy and wind energy has strong volatility and anti-peak shaving characteristics, and the increase of the network surfing duty ratio of the new energy power generation brings great challenges to the peak shaving of the power grid. With the rapid development of clean energy industry in China, the problem of the consumption of new energy power generation is still serious, and phenomena such as wind abandoning, light abandoning and the like are common. At present, the thermal power generation capacity of China is excessive, the annual utilization hours of power generation equipment are low, and the continuous low-load operation or the deep peak regulation operation of the thermal power generating unit can become a normal state in the next years. The heat and power cogeneration unit has large specific gravity and wide range in thermal power generation, and the improvement of the deep peak shaving capacity of the heat and power cogeneration unit is a key technology for effectively absorbing renewable energy sources for power generation. The conventional deep peak shaving technology of the thermoelectric unit at present has the following problems:
(1) The peak regulation modes such as an electric boiler, bypass main steam and cylinder cutting only reduce the power generation output of the unit in the low-peak period of electric power, and in order to improve the heat supply capacity, the unit extracts steam and supplies heat in the peak period of electric power so that the power generation output in the peak period is influenced.
(2) The conventional cogeneration peak shaving system has the practical problems of inflexible parameter adjustment, inflexible heat source steam selection, low energy utilization efficiency, small peak shaving depth and the like.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a solar-assisted cogeneration system and an operation method, wherein in the daytime in the peak heat supply low-valley period of electric power, a solar-driven absorption heat pump is adopted to recover the exhaust waste heat of a steam turbine and the return water waste heat of a heat supply network, and a peak heater is adopted to heat the water supply at the outlet of an evaporator of the absorption heat pump to a specified temperature. On the premise of meeting the heating load, the redundant hot water is used for auxiliary heating of the water supply of the regenerative system of the steam turbine so as to improve the power generation output of the steam turbine; the excessive solar heat in the daytime is stored by the high-temperature tank and used as a heat source at night. The heat released by the high-temperature tank is used for driving the absorption heat pump at night in the peak period of electric low-valley heat supply, the waste heat of steam turbine exhaust and the waste heat of heat supply network backwater are recovered, the peak heater is adopted for heating the water supply at the outlet of the evaporator of the absorption heat pump to the designated temperature, and finally the water supply system is completely used for heat supply of the heat supply network. The invention can operate in a pure condensation working condition in a heating season, greatly improves peak regulation flexibility, simultaneously uses solar energy as an auxiliary heat source to further improve the power output of the unit in the power peak period, and uses solar energy to drive the absorption heat pump to recycle the waste heat of the system, thereby greatly improving the comprehensive utilization efficiency of the system energy. The invention realizes the flexible and rapid switching of the working modes of the power station system in the peak-valley period, realizes the orderly utilization of energy steps in the peak regulation process, and has the advantages of high energy utilization efficiency, large peak regulation depth and flexible parameter adjustment.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the solar auxiliary cogeneration system comprises a main steam side of a boiler 201, a turbine high-pressure cylinder 202, a reheat steam side of the boiler 201, a turbine medium-pressure cylinder 203, a turbine low-pressure cylinder 204, a condenser 206, a seventh-stage regenerative heater 216 pipe side, a sixth-stage regenerative heater 215 pipe side, a fifth-stage regenerative heater 214 pipe side, a fourth-stage regenerative heater 213 pipe side, a deaerator 212, a second-stage regenerative heater 211 pipe side, a first-stage regenerative heater 210 pipe side and a main steam side of the boiler 201 which are sequentially communicated; the heat conducting oil outlet pipeline of the trough type solar heat collection system 101 is divided into two paths through a three-way switching valve A105, one path is communicated with the heat conducting oil inlet pipeline of the trough type solar heat collection system 101 through the oil side of an oil-water heat exchanger A102 and a three-way switching valve B106 in sequence, and the other path is communicated with the heat conducting oil inlet pipeline of the trough type solar heat collection system 101 through the oil side of an oil-water heat exchanger B109 and a three-way switching valve B106 in sequence; the high-temperature heat storage tank 104 is sequentially communicated with the regulating valve 107, the water side of the oil-water heat exchanger A102, the water pump 108 and the low-temperature heat storage tank 103 through pipelines; the water side outlet of the oil-water heat exchanger B109 is sequentially communicated with a three-way regulating valve A111, a generator of an absorption heat pump 118, a three-way regulating valve B112 and the water side inlet of the oil-water heat exchanger B109 through pipelines; the three-way regulating valve A111 is communicated with the three-way regulating valve B112 through the shell side of the peak heater 110; the condenser outlet of the absorption heat pump 118 is communicated with the condenser inlet of the absorption heat pump 118 through the pipe side of the peak heater 110, the three-way switching valve C113, the shell side of the auxiliary heater 116, the three-way switching valve T114, the absorber of the absorption heat pump 118; the three-way switching valve C113 is sequentially communicated with the heat supply network 115, the shell side of the waste heat heater 117 and the three-way switching valve T114 through pipelines; the pipe side inlet of the seventh-stage regenerative heater 216 is communicated with the pipe side inlet of the fourth-stage regenerative heater 213 sequentially through the three-way regulating valve C207, the pipe side of the auxiliary heater 116 and the three-way regulating valve D208; the outlet of the side of the condenser 206 is sequentially communicated with a three-way regulating valve pentane 121, a three-way regulating valve hexane 120, an evaporator of an absorption heat pump 118, a three-way regulating valve heptyl 119, a three-way regulating valve octyl 122 and the inlet of the side of the condenser 206 through pipelines; the three-way regulating valve 120 is sequentially communicated with the pipe side of the waste heat heater 117 and the three-way regulating valve heptyl 119 through a pipeline; the three-way regulating valve penta 121 is sequentially communicated with the cooling tower 209 and the three-way regulating valve octyl 122 through pipelines; the generator 205 is connected with the turbine high pressure cylinder 202, the turbine intermediate pressure cylinder 203 and the turbine low pressure cylinder 202 through mechanical rotating shafts; the steam extraction pipelines of the steam turbines 1# to 7# with the pressure from high to low are respectively communicated with the shell side inlet of the first-stage regenerative heater 210, the shell side inlet of the second-stage regenerative heater 211, the inlet of the deaerator 212, the shell side inlet of the fourth-stage regenerative heater 213, the shell side inlet of the fifth-stage regenerative heater 214, the shell side inlet of the sixth-stage regenerative heater 215 and the shell side inlet of the seventh-stage regenerative heater 216; the shell side of the first-stage regenerative heater 210 is sequentially communicated with the shell side of the second-stage regenerative heater 211 and the deaerator 212, and the shell side of the fourth-stage regenerative heater 213 is sequentially communicated with the shell side of the fifth-stage regenerative heater 214, the shell side of the sixth-stage regenerative heater 215, the shell side of the seventh-stage regenerative heater 216 and the condenser 206.
The operation method of the solar auxiliary cogeneration system comprises the following steps of: the groove type solar heat collection system 101 is put into operation, and the three-way switching valve A105 and the three-way switching valve B106 are regulated according to the electric load and the thermal load, so that the flow of high-temperature heat conduction oil flowing out of the groove type solar heat collection system 101 is reasonably divided into two paths; the turning of the water pump 108 and the opening of the regulating valve 107 are regulated, so that the low-temperature water in the low-temperature heat storage tank 103 is absorbed by the oil-water heat exchanger A102 to become high-temperature water with specified temperature, and the high-temperature water is stored in the high-temperature heat storage tank 104; the high-temperature hot water flowing out of the oil-water heat exchanger B109 is divided into two paths which are respectively used as heat sources of the peak heater 110 and the absorption heat pump 118 generator, and the temperature of the hot water at the outlet of the peak heater 110 reaches the temperature required by the heat supply network 115 by adjusting the three-way regulating valve A111 and the three-way regulating valve B112; on the premise of ensuring the water supply flow and the heat load of the heat supply network 115, the three-way switching valve C113 and the three-way switching valve T114 are regulated, the water supply of the heat recovery system of the steam turbine is heated by the auxiliary heater 116, and the three-way regulating valve C207 and the three-way regulating valve T208 are regulated so that the water temperature of the outlet at the pipe side of the auxiliary heater 116 is kept consistent with the water temperature of the outlet at the pipe side of the fifth-stage heat recovery heater 214; the three-way regulating valve 120 and the three-way regulating valve heptyl 119 are regulated, so that the temperature difference between the return water temperature of the heat supply network at the shell side of the waste heat heater 117 and the temperature difference between the water at the outlet of the shell side of the auxiliary heater 116 are kept within a preset temperature difference, and the temperature difference between the water at the outlet of the pipe side of the waste heat heater 117 and the temperature difference between the water at the outlet of the evaporator of the absorption heat pump 118 are kept within a preset temperature difference; the three-way regulating valve penta 121 and the three-way regulating valve octyl 122 are regulated, so that the temperature of the warm water at the outlet of the cooling tower 209 is consistent with the temperature of the pipeline between the three-way regulating valve heptyl 119 and the three-way regulating valve octyl 122;
the operation method of the solar auxiliary cogeneration system comprises the following steps of: the groove type solar heat collection system 101 does not work, a pipeline where the groove type solar heat collection system 101 is positioned is closed by adjusting the three-way switching valve A105 and the three-way switching valve B106, the steering direction of the water pump 108 is adjusted, and the opening of the valve 107 is adjusted according to the thermal load at night, so that the high-temperature water in the high-temperature heat storage tank 104 becomes low-temperature water after heat is released by the oil-water heat exchanger A102, and the low-temperature water is stored in the low-temperature heat storage tank 103; the three-way switching valve C113, the three-way switching valve T114, the three-way regulating valve C207 and the three-way regulating valve T208 are regulated so that the shell side and the tube side of the auxiliary heater 116 do not work; the three-way regulating valve A111 and the three-way regulating valve B112 are regulated to ensure that the water temperature at the pipe side outlet of the peak heater 110 is consistent with the water supply temperature required by the night heat supply network 115; the three-way regulating valve (121), the three-way regulating valve (120), the three-way regulating valve (119) and the three-way regulating valve (122) are regulated, so that the temperature difference among the outlet water temperature of the evaporator of the absorption heat pump (118), the water temperature of the outlet at the tube side of the waste heat heater (117) and the warm water at the inlet at the tube side of the condenser (206) is kept within the preset temperature difference.
Compared with the prior art, the invention has the following advantages:
(1) In the power peak time, the peak heater heats in a gradient way, and the absorption heat pump fully recovers the exhaust waste heat of the steam turbine, so that the ordered utilization of the energy in a gradient way is realized.
(2) The solar energy auxiliary unit generates electricity in the power peak period, so that the power output of the unit in the power peak period is improved, and the power peak regulation interval is enlarged.
(3) Solar energy is used as a peak heater and an absorption heat pump driving heat source, so that the primary energy saving rate of the system is greatly improved.
(4) The invention realizes the operation of the heating season thermoelectric unit under the pure condensation working condition, improves the flexible switching speed of the working mode of the power station system in the peak-valley period, and has large peak regulation depth and flexible parameter adjustment.
Drawings
Fig. 1 is a schematic diagram of a solar-assisted cogeneration system and method of operation of the invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
In order to realize efficient and flexible coupling of solar energy and a cogeneration unit, as shown in fig. 1, the solar energy assisted cogeneration system comprises a main steam side of a boiler 201, a turbine high-pressure cylinder 202, a reheat steam side of the boiler 201, a turbine intermediate-pressure cylinder 203, a turbine low-pressure cylinder 204, a condenser 206, a seventh-stage regenerative heater 216 pipe side, a sixth-stage regenerative heater 215 pipe side, a fifth-stage regenerative heater 214 pipe side, a fourth-stage regenerative heater 213 pipe side, a deaerator 212, a second-stage regenerative heater 211 pipe side, a first-stage regenerative heater 210 pipe side and a main steam side of the boiler 201 which are sequentially communicated; the heat conducting oil outlet pipeline of the trough type solar heat collection system 101 is divided into two paths through a three-way switching valve A105, one path is communicated with the heat conducting oil inlet pipeline of the trough type solar heat collection system 101 through the oil side of an oil-water heat exchanger A102 and a three-way switching valve B106 in sequence, and the other path is communicated with the heat conducting oil inlet pipeline of the trough type solar heat collection system 101 through the oil side of an oil-water heat exchanger B109 and a three-way switching valve B106 in sequence; the high-temperature heat storage tank 104 is sequentially communicated with the regulating valve 107, the water side of the oil-water heat exchanger A102, the water pump 108 and the low-temperature heat storage tank 103 through pipelines; the water side outlet of the oil-water heat exchanger B109 is sequentially communicated with a three-way regulating valve A111, a generator of an absorption heat pump 118, a three-way regulating valve B112 and the water side inlet of the oil-water heat exchanger B109 through pipelines; the three-way regulating valve A111 is communicated with the three-way regulating valve B112 through the shell side of the peak heater 110; the condenser outlet of the absorption heat pump 118 is communicated with the condenser inlet of the absorption heat pump 118 through the pipe side of the peak heater 110, the three-way switching valve C113, the shell side of the auxiliary heater 116, the three-way switching valve T114, the absorber of the absorption heat pump 118; the three-way switching valve C113 is sequentially communicated with the heat supply network 115, the shell side of the waste heat heater 117 and the three-way switching valve T114 through pipelines; the pipe side inlet of the seventh-stage regenerative heater 216 is communicated with the pipe side inlet of the fourth-stage regenerative heater 213 sequentially through the three-way regulating valve C207, the pipe side of the auxiliary heater 116 and the three-way regulating valve D208; the outlet of the side of the condenser 206 is sequentially communicated with a three-way regulating valve pentane 121, a three-way regulating valve hexane 120, an evaporator of an absorption heat pump 118, a three-way regulating valve heptyl 119, a three-way regulating valve octyl 122 and the inlet of the side of the condenser 206 through pipelines; the three-way regulating valve 120 is sequentially communicated with the pipe side of the waste heat heater 117 and the three-way regulating valve heptyl 119 through a pipeline; the three-way regulating valve penta 121 is sequentially communicated with the cooling tower 209 and the three-way regulating valve octyl 122 through pipelines; the generator 205 is connected with the turbine high pressure cylinder 202, the turbine intermediate pressure cylinder 203 and the turbine low pressure cylinder 202 through mechanical rotating shafts; the steam extraction pipelines of the steam turbines 1# to 7# with the pressure from high to low are respectively communicated with the shell side inlet of the first-stage regenerative heater 210, the shell side inlet of the second-stage regenerative heater 211, the inlet of the deaerator 212, the shell side inlet of the fourth-stage regenerative heater 213, the shell side inlet of the fifth-stage regenerative heater 214, the shell side inlet of the sixth-stage regenerative heater 215 and the shell side inlet of the seventh-stage regenerative heater 216; the shell side of the first-stage regenerative heater 210 is sequentially communicated with the shell side of the second-stage regenerative heater 211 and the deaerator 212, and the shell side of the fourth-stage regenerative heater 213 is sequentially communicated with the shell side of the fifth-stage regenerative heater 214, the shell side of the sixth-stage regenerative heater 215, the shell side of the seventh-stage regenerative heater 216 and the condenser 206. According to the system configuration of the invention, the primary energy saving rate of the system can be greatly improved by taking solar energy as a means for driving a heat source by a peak heater and an absorption heat pump.
In order to more scientifically and effectively develop the economical and flexibility potential of the solar-assisted cogeneration system, the daytime electric power peak heating valley period operates in the following manner: the groove type solar heat collection system 101 is put into operation, the three-way switching valve A105 and the three-way switching valve B106 are regulated according to electric load and thermal load, so that the flow of high-temperature heat conduction oil flowing out of the groove type solar heat collection system 101 is reasonably divided into two paths, one path is used for driving the absorption heat pump 118 and the peak heater 110 to work, and the other path stores heat energy in the heat storage tank after heat exchange is carried out by the oil-water heat exchanger A102; the turning of the water pump 108 and the opening of the regulating valve 107 are regulated, so that the low-temperature water in the low-temperature heat storage tank 103 is absorbed by the oil-water heat exchanger A102 to become high-temperature water with specified temperature, and the high-temperature water is stored in the high-temperature heat storage tank 104 and used as a heat source in the night electricity valley period; the high-temperature hot water flowing out of the oil-water heat exchanger B109 is divided into two paths which are respectively used as heat sources of the peak heater 110 and the absorption heat pump 118 generator, and the working medium flow in an outlet pipeline of the three-way valve is reasonably distributed by adjusting the three-way regulating valve A111 and the three-way regulating valve B112, so that the hot water at the outlet of the peak heater 110 reaches the temperature required by the heat supply network 115 after full heat exchange; the three-way switching valve C113 and the three-way switching valve T114 are regulated, the working medium flow in an outlet pipeline of the three-way valve is reasonably distributed, on the premise that the water supply flow and the heat load of the heat supply network 115 are preferentially ensured, the water supply of the steam turbine regenerative system is heated by the auxiliary heater 116, the working medium heat exchange process adopts dividing wall type heat exchange, the three-way regulating valve C207 and the three-way regulating valve T208 are regulated, the heating flow of the water supply of the steam turbine regenerative system in the auxiliary heater 116 is controlled, and the water temperature of the outlet of the pipe side of the auxiliary heater 116 is kept consistent with the water temperature of the outlet of the pipe side of the fifth-stage regenerative heater 214; the three-way regulating valve 120 and the three-way regulating valve 119 are regulated to control the flow of refrigerant water entering the evaporator of the absorption heat pump 118, so that the temperature difference between the return water temperature of the shell side outlet heat supply network of the waste heat heater 117 and the temperature difference between the water temperature of the shell side outlet of the auxiliary heater 116 are kept within 3 ℃, and the temperature difference between the water temperature of the tube side outlet of the waste heat heater 117 and the water temperature of the evaporator of the absorption heat pump 118 is kept within 3 ℃; regulating the three-way regulating valve penta 121 and the three-way regulating valve octyl 122, and controlling the circulating water flow entering the cooling tower 209 so that the temperature of the warm water at the outlet of the cooling tower 209 is consistent with the temperature of the pipeline between the three-way regulating valve heptyl 119 and the three-way regulating valve octyl 122; in the power peak time, the peak heater heats in a gradient way, the absorption heat pump fully recovers the exhaust waste heat of the steam turbine, and the energy can be utilized in a gradient order; meanwhile, the solar energy assists the unit to generate electricity, so that the electricity output of the unit in the power peak period can be improved, and the power peak regulation interval is enlarged.
The operation method of the solar auxiliary cogeneration system comprises the following steps of: the groove type solar heat collection system 101 does not work, and the pipeline of the groove type solar heat collection system 101 is not circulated by adjusting the three-way switching valve A105 and the three-way switching valve B106, so that the pipeline of the groove type solar heat collection system 101 is closed, the steering of the water pump 108 is adjusted, the opening of the valve 107 is adjusted according to the thermal load at night, high-temperature water in the high-temperature heat storage tank 104 is changed into low-temperature water after heat is released by the oil-water heat exchanger A102, and the low-temperature water is stored in the low-temperature heat storage tank 103, so that the energy storage device operates under an energy release working condition; the three-way switching valve C113, the three-way switching valve T114, the three-way regulating valve C207 and the three-way regulating valve T208 are regulated, so that a channel of the pipeline where the three-way valve is positioned for flowing hot water working medium to the auxiliary heater 116 is closed, and the shell side and the pipe side of the auxiliary heater 116 do not work; the opening degree of each outlet of the three-way regulating valve A111 and the three-way regulating valve B112 is regulated, so that the flow rate of high-temperature working medium flowing to the absorption heat pump 118 and the peak heater 110 is controlled, and after the working medium exchanges heat fully, the water temperature at the outlet of the pipe side of the peak heater 110 is consistent with the water supply temperature required by the night heat supply network 115; and the three-way regulating valve (121), the three-way regulating valve (120), the three-way regulating valve (119) and the three-way regulating valve (122) are regulated, and the working medium flow of a pipeline where the three-way valve is positioned is controlled, so that the temperature difference between the water temperature at the outlet of the evaporator of the absorption heat pump (118), the water temperature at the outlet of the waste heat heater (117) and the warm water at the inlet of the condenser (206) is kept within 3 ℃. Through reasonable matching of the operation method and the system configuration, the invention can realize the operation of the heating season thermoelectric unit under the pure condensation working condition, improves the flexible switching speed of the working mode of the power station system in the peak-valley period, has large peak regulation depth and flexible parameter adjustment.
Claims (3)
1. A solar auxiliary cogeneration system comprises a main steam side of a boiler (201), a high-pressure cylinder (202) of a steam turbine, a reheat steam side of the boiler (201), a medium-pressure cylinder (203) of the steam turbine, a low-pressure cylinder (204) of the steam turbine, a condenser (206), a pipe side of a seventh-stage regenerative heater (216), a pipe side of a sixth-stage regenerative heater (215), a pipe side of a fifth-stage regenerative heater (214), a pipe side of a fourth-stage regenerative heater (213), an oxygen remover (212), a pipe side of a second-stage regenerative heater (211), a pipe side of a first-stage regenerative heater (210) and a main steam side of the boiler (201), which are sequentially communicated; the heat conducting oil outlet pipeline of the trough type solar heat collection system (101) is divided into two paths through a three-way switching valve A (105), one path is communicated with the heat conducting oil inlet pipeline of the trough type solar heat collection system (101) through the oil side of the oil-water heat exchanger A (102) and a three-way switching valve B (106) in sequence, and the other path is communicated with the heat conducting oil inlet pipeline of the trough type solar heat collection system (101) through the oil side of the oil-water heat exchanger B (109) and the three-way switching valve B (106) in sequence; the high-temperature heat storage tank (104) is sequentially communicated with the regulating valve (107), the water side of the oil-water heat exchanger A (102), the water pump (108) and the low-temperature heat storage tank (103) through pipelines; the water side outlet of the oil-water heat exchanger B (109) is sequentially communicated with a three-way regulating valve A (111), a generator of an absorption heat pump (118), a three-way regulating valve B (112) and a water side inlet of the oil-water heat exchanger B (109) through pipelines; the three-way regulating valve A (111) is communicated with the three-way regulating valve B (112) through the shell side of the peak heater (110); the condenser outlet of the absorption heat pump (118) is communicated with the condenser inlet of the absorption heat pump (118) through the pipe side of the peak heater (110), the three-way switching valve C (113), the shell side of the auxiliary heater (116), the three-way switching valve T (114), the absorber of the absorption heat pump (118) and the three-way switching valve C; the three-way switching valve C (113) is sequentially communicated with a heat supply network (115), the shell side of the waste heat heater (117) and the three-way switching valve T (114) through pipelines; the pipe side inlet of the seventh-stage regenerative heater (216) is communicated with the pipe side inlet of the fourth-stage regenerative heater (213) through a three-way regulating valve C (207) and the pipe side of the auxiliary heater (116) in sequence; the outlet at the tube side of the condenser (206) is sequentially communicated with a three-way regulating valve (121), a three-way regulating valve (120), an evaporator of an absorption heat pump (118), a three-way regulating valve (119), a three-way regulating valve octyl (122) and the inlet at the tube side of the condenser (206) through pipelines; the three-way regulating valve (120) is sequentially communicated with the pipe side of the waste heat heater (117) and the three-way regulating valve (119) through a pipeline; the three-way regulating valve (121) is sequentially communicated with the cooling tower (209) and the three-way regulating valve (122) through pipelines; the generator (205) is connected with the turbine high-pressure cylinder (202), the turbine medium-pressure cylinder (203) and the turbine low-pressure cylinder (202) through mechanical rotating shafts; the steam turbine 1# to 7# steam extraction pipelines with the pressure from high to low are respectively communicated with a shell side inlet of a first-stage regenerative heater (210), a shell side inlet of a second-stage regenerative heater (211), an inlet of a deaerator (212), a shell side inlet of a fourth-stage regenerative heater (213), a shell side inlet of a fifth-stage regenerative heater (214), a shell side inlet of a sixth-stage regenerative heater (215) and a shell side inlet of a seventh-stage regenerative heater (216); the shell side of the first-stage regenerative heater (210) is sequentially communicated with the shell side of the second-stage regenerative heater (211) and the deaerator (212), and the shell side of the fourth-stage regenerative heater (213) is sequentially communicated with the shell side of the fifth-stage regenerative heater (214), the shell side of the sixth-stage regenerative heater (215) and the shell side of the seventh-stage regenerative heater (216) and the condenser (206).
2. A method of operating a solar-assisted cogeneration system according to claim 1, wherein: in the daytime, the electric power peak heat supply low-valley period is shortened, the trough type solar heat collection system (101) works, and the three-way switching valve A (105) and the three-way switching valve B (106) are adjusted according to electric load and thermal load, so that the high-temperature heat conduction oil flow flowing out of the trough type solar heat collection system (101) is divided into two paths; the turning of the water pump (108) and the opening of the regulating valve (107) are regulated, so that low-temperature water in the low-temperature heat storage tank (103) is converted into high-temperature water with specified temperature through the heat of heat transfer oil absorbed by the oil-water heat exchanger A (102) and is stored in the high-temperature heat storage tank (104); the high-temperature hot water flowing out of the oil-water heat exchanger B (109) is divided into two paths which are respectively used as heat sources of the peak heater (110) and the absorption heat pump (118) generator, and the temperature of the hot water at the outlet of the peak heater (110) reaches the temperature required by a heat supply network (115) by adjusting the three-way regulating valve A (111) and the three-way regulating valve B (112); the three-way switching valve C (113) and the three-way switching valve T (114) are regulated, on the premise of ensuring the water supply flow and the heat load of the heat supply network (115), the water supply of the heat recovery system of the steam turbine is heated by the auxiliary heater (116), and the three-way regulating valve C (207) and the three-way regulating valve T (208) are regulated so that the water temperature of the outlet at the pipe side of the auxiliary heater (116) is kept consistent with the water temperature of the outlet at the pipe side of the fifth-stage recovery heater (214); the three-way regulating valve (120) and the three-way regulating valve (119) are regulated, so that the temperature difference between the return water temperature of the shell side outlet heat supply network of the waste heat heater (117) and the temperature difference between the shell side outlet water temperature of the auxiliary heater (116) is kept within a preset temperature difference, and the temperature difference between the water temperature of the tube side outlet of the waste heat heater (117) and the water temperature of the evaporator outlet of the absorption heat pump (118) is kept within a preset temperature difference; and (3) regulating the three-way regulating valve penta (121) and the three-way regulating valve octyl (122) to ensure that the temperature of the warm water at the outlet of the cooling tower (209) is consistent with the temperature of the pipeline between the three-way regulating valve heptyl (119) and the three-way regulating valve octyl (122).
3. A method of operating a solar-assisted cogeneration system according to claim 1, wherein: the method comprises the steps that during a night electricity low-valley heat supply peak period, a trough type solar heat collection system (101) does not work, a pipeline where the trough type solar heat collection system (101) is located is closed by adjusting a three-way switching valve A (105) and a three-way switching valve B (106), the steering direction of a water pump (108) is adjusted, the opening of a heat load adjusting valve (107) is adjusted according to night, so that high-temperature water in a high-temperature heat storage tank (104) becomes low-temperature water after heat is released by an oil-water heat exchanger A (102), and the low-temperature water is stored in a low-temperature heat storage tank (103); the three-way switching valve C (113), the three-way switching valve T (114), the three-way regulating valve C (207) and the three-way regulating valve T (208) are regulated, so that the shell side and the tube side of the auxiliary heater (116) do not work; the three-way regulating valve A (111) and the three-way regulating valve B (112) are regulated to ensure that the water temperature at the outlet of the pipe side of the peak heater (110) is consistent with the water supply temperature required by the night heat supply network (115); the three-way regulating valve (121), the three-way regulating valve (120), the three-way regulating valve (119) and the three-way regulating valve (122) are regulated, so that the temperature difference among the outlet water temperature of the evaporator of the absorption heat pump (118), the outlet water temperature of the tube side of the waste heat heater (117) and the warm water at the inlet of the tube side of the condenser (206) is kept within the preset temperature difference.
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