CN111351265A - Thermoelectric combined water mixing and water dividing type heat pump heating method - Google Patents
Thermoelectric combined water mixing and water dividing type heat pump heating method Download PDFInfo
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- CN111351265A CN111351265A CN201811566073.1A CN201811566073A CN111351265A CN 111351265 A CN111351265 A CN 111351265A CN 201811566073 A CN201811566073 A CN 201811566073A CN 111351265 A CN111351265 A CN 111351265A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 461
- 238000010438 heat treatment Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 20
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims abstract description 210
- 238000003860 storage Methods 0.000 claims description 50
- 239000002699 waste material Substances 0.000 claims description 20
- 239000002918 waste heat Substances 0.000 abstract description 38
- 238000011084 recovery Methods 0.000 abstract description 27
- 239000007789 gas Substances 0.000 abstract description 7
- 125000004122 cyclic group Chemical group 0.000 abstract description 4
- 238000009826 distribution Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000009833 condensation Methods 0.000 abstract 1
- 230000005494 condensation Effects 0.000 abstract 1
- 239000005329 float glass Substances 0.000 description 36
- 238000001816 cooling Methods 0.000 description 21
- 238000005338 heat storage Methods 0.000 description 15
- 230000008859 change Effects 0.000 description 11
- 239000000498 cooling water Substances 0.000 description 7
- 239000000446 fuel Substances 0.000 description 6
- 230000005855 radiation Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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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
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
- F25B15/06—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide
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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
- F01K17/025—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic in combination with at least one gas turbine, e.g. a combustion gas turbine
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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
- F24D15/00—Other domestic- or space-heating systems
- F24D15/04—Other domestic- or space-heating systems using heat pumps
-
- 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
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
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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
- 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
- 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]
- Y02B30/62—Absorption based systems
- Y02B30/625—Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Materials Engineering (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
A heating method of a thermoelectric combined water mixing and dividing type heat pump belongs to the field of heat supply waste heat recovery and heat distribution, and aims to solve the problems that a lithium bromide heat pump is provided with a high-temperature heat source, the heat supply and demand are not matched, and the heat of high-temperature power plant water and stored water is supplied to a user side in a grading mode, a second water divider divides water with the same quantity as that input by a cogeneration device and conveys the water to a power plant through a power plant condensation gas return pipe, and the rest water is conveyed to a water divider through a pipeline to serve as return water; high-temperature steam of 100 ℃ generated by the steam turbine enters the first lithium bromide heat pump unit as a high-temperature heat source, and the outlet water of the medium-temperature heat source of the first lithium bromide heat pump unit is secondary heat exchange water at about 50 ℃, so that the effect is that the high-temperature water is provided with the heat source by the low-temperature power plant water at the steam exhaust device and the steam turbine, and the heat is gradually increased by the steam heat pump unit and the plurality of lithium bromide heat pump units, so that the high-temperature heat source is provided for the lithium bromide heat pump, and the cyclic utilization of the power plant water is.
Description
Technical Field
The invention belongs to the field of heat supply waste heat recovery and heat distribution, and relates to a thermoelectricity combined water mixing and water distribution type heat pump heating method.
Background
In recent years, with the increase of urban heating area and the increase of industrial factory building production line construction in China, the heat consumption in China is rapidly increased, and the heat supply mode is analyzed, so that at present, the heating of residents in China mainly has the following modes: the system comprises a heat and power cogeneration mode, a centralized heating mode of small and medium-sized regional boiler rooms, a household small gas water heater, a household coal-fired furnace and the like, wherein the heat and power cogeneration mode is a comprehensive energy utilization technology for generating power by utilizing high-grade heat energy of fuel and then supplying heat to low-grade heat energy of the fuel. At present, the average power generation efficiency of 300 ten thousand kilowatt thermal power plants in China is 33%, when the thermal power plants supply heat, the power generation efficiency can reach 20%, the rest 80%, more than 70% of heat can be used for supplying heat, 10000 kilojoule of thermal fuel is used, a cogeneration mode is adopted, 2000 kilojoule of power and 7000 kilojoule of heat can be generated, and a common thermal power plant is adopted for power generation, 6000 kilojoule of fuel needs to be consumed by the 2000 kilojoule of power, so that the power generated by the cogeneration mode is deducted from the fuel consumption of the common power plant according to the power generation efficiency of the common power plant, and the rest 4000 kilojoule of fuel can generate 7000 kilojoule of heat. In this sense, the heat supply efficiency of the thermal power plant is 170%, which is about twice of the heat supply efficiency of the small and medium-sized boiler rooms. When the conditions allow, the heating mode of cogeneration should be developed preferentially. In cogeneration heat supply, there are some problems, for example; on one hand, high-temperature steam in a power plant is expensive, on the other hand, a large amount of heat insulation materials are needed in a high-temperature steam heating pipeline to reduce heat loss, and under the condition that the heating temperature is higher, large heat loss can be caused even though more heat insulation materials are used. Therefore, other heat sources such as industrial waste heat with low price and large yield need to be found to replace high-temperature steam in a power plant part. The waste heat of low-temperature industry represented by a float glass plant is abandoned at present, or the extra water and electricity resources are used for emission, so that the waste heat is discarded with the disadvantage.
Disclosure of Invention
In order to solve the problems that a high-temperature heat source is provided for a lithium bromide heat pump, the heat supply and the heat demand are not matched, a lithium bromide heat pump heating device exchanges heat among stored water, a user side and power plant water, and the heat of the high-temperature power plant water and the stored water is supplied to the user side in a grading manner, the invention provides the following technical scheme:
a heating method of a thermoelectric combined water mixing and dividing type heat pump is characterized in that a condenser lead-in pipe of a power plant is communicated with a high-temperature heat exchange section of a lithium bromide heat pump and conveys high-temperature heat exchange water (100 ℃) to the high-temperature heat exchange section, an outlet of the high-temperature heat exchange section is communicated with an inlet of a hot water flow passage of a plate type heat exchanger and conveys the high-temperature heat exchange water after high-temperature heat exchange to the hot water flow passage, an outlet of the hot water flow passage of the plate type heat exchanger is communicated with a second inlet of a water mixer and conveys plate type heat exchange water to the water mixer, an outlet of a water storage tank is communicated with a first inlet of the water mixer and conveys storage water to the water mixer, the plate type heat exchange water and the storage water form mixed water in the water mixer, an outlet of the water mixer is communicated with a low-temperature heat exchange section of the lithium bromide heat pump and conveys the mixed water as a low-temperature heat source, an outlet of the, the residual water is conveyed to the water separator by a pipeline to be used as return water;
the cogeneration apparatus performs the following method: the method comprises the following steps that power plant water with the temperature of about 5 ℃ enters a cold water inlet of a condenser of a steam heat pump unit, waste steam water generated by a waste steam device exchanges heat with the power plant water with the temperature of about 5 ℃ at an evaporator end of the steam heat pump unit, primary heat exchange water with the temperature of about 30 ℃ is output from a condenser end of the steam heat pump unit, and the primary heat exchange water enters a medium-temperature heat source of a first lithium bromide heat pump unit and serves as inlet water of the first lithium bromide heat pump unit; the waste steam water generated by the waste steam device enters a first lithium bromide heat pump unit as a low-temperature heat source, high-temperature steam with the temperature of 100 ℃ generated by a steam turbine enters the first lithium bromide heat pump unit as a high-temperature heat source, and secondary heat exchange water with the temperature of about 50 ℃ is discharged from a medium-temperature heat source of the first lithium bromide heat pump unit; the waste steam water generated by the waste steam device enters a second lithium bromide heat pump unit to be used as a low-temperature heat source, the high-temperature steam generated by the steam turbine enters the second lithium bromide heat pump unit to be used as a high-temperature heat source, and the effluent of a medium-temperature heat source of the second lithium bromide heat pump unit is three-stage heat exchange water at about 70 ℃; and the waste steam water generated by the waste steam device enters a third lithium bromide heat pump unit to be used as a low-temperature heat source, the high-temperature steam generated by the steam turbine enters the third lithium bromide heat pump unit to be used as a high-temperature heat source, the effluent water of a medium-temperature heat source of the third lithium bromide heat pump unit is four-stage heat exchange water at about 90 ℃, the four-stage heat exchange water enters a steam-water heat exchanger to exchange heat with the high-temperature steam generated by the steam turbine, and the hot water at 100 ℃ is output by the steam-water heat exchanger.
The high-temperature water is provided with a heat source by low-temperature power plant water at an exhaust steam device and a steam turbine, and is gradually heated by a steam heat pump unit and a plurality of lithium bromide heat pump units, so that a high-temperature heat source is provided for the lithium bromide heat pump, the cyclic utilization of the power plant water is realized, the problem of mismatching of heat supply and demand caused by severe cold weather and other conditions can be solved, the heat demand of a user side in normal load can be met, the stepped utilization of energy is realized, the basic concept of energy conservation and emission reduction is met, the economic cost is saved, and the economic benefit is improved. Lithium bromide heat pump heating system is to the storage water, carried out the heat transfer between user side and the power plant water, supply the user side with the heat of high temperature power plant water and storage water, promptly through the lithium bromide heat pump, the heat transfer is accomplished to plate heat exchanger, and return power plant and first water knockout drum respectively with the low temperature moisture after the heat transfer, make the low temperature water after the heat transfer continue to participate in the circulation, not only accomplished high temperature heat and low temperature thermal output in the lump, still by cyclic utilization with water, water source and thermal saving and make full use of have been realized.
Drawings
FIG. 1 is a piping connection diagram of the apparatus of the present invention.
Fig. 2 is a piping connection diagram of the cogeneration unit of the power plant of the present invention.
1. A float glass workshop, 2, a prepared water tank, 3, a first control valve, 4, a second control valve, 5, a first circulating pump, 6, a cooling tower, 7, a third control valve, 8, a fourth control valve, 9, a fifth control valve, 10, a sixth control valve, 11, a seventh control valve, 12, an eighth control valve, 13, a ninth control valve, 14, a tenth control valve, 15, an eleventh control valve, 16, a twelfth control valve, 17, a second circulating pump, 18, a third circulating pump, 19, an overflow port, 20, a heat insulation layer, 21, a cold pool, 22, a hot pool, 23, a first heat pump, 24, a second heat pump, 25, a third heat pump, 26, a water collector, 27, a fourth circulating pump, 28, a first water separator, 29, a temperature sensor, 30, a fifth circulating pump, 31, a phase change heat storage device, 32, a thirteenth control valve, 33, a fourteenth control valve, 34, a solar cell panel, 35. a fifteenth control valve, 36, a sixteenth control valve, 37, a water storage tank, 38, a lithium bromide heat pump, 39, a plate heat exchanger, 40, a user end pipeline, 41, a cogeneration device, 42, a water mixer, 43, a water dividing valve, 44, a second water divider, 45, a power plant condensed gas return pipe, 46 and a sixth circulating pump.
1-1, a steam heat pump unit, 1-2, a third lithium bromide heat pump unit, 1-3, a second lithium bromide heat pump unit, 1-4, a first lithium bromide heat pump unit, 1-5, a steam-water heat exchanger, 1-6, a steam exhaust device and 1-7, a steam turbine.
Detailed Description
Example 1:
an integrated multi-waste-heat coupling heating system comprises a float glass waste heat recovery device, a solar waste heat recovery device and a lithium bromide heat pump heating device.
Float glass waste heat recovery device, including float glass workshop (1), hot pond (22), cold pond (21), second circulating pump (17), third circulating pump (18) two-stage control valve, cooling tower (6), heat pump, the first delivery port of float glass workshop (1) lets in hot pond (22) by first water pipe, the entry intercommunication water-supply pipe of cooling tower (6), the outlet line of cooling tower (6) lets in cold pond (21), water-supply pipe installation two-stage control valve and circulating pump, water-supply pipe lets in hot pond (22), the circulating pump sets up the position department between hot pond (22) and the two-stage control valve of water-supply pipe, by between the valve of two-stage control valve the water-supply pipe intercommunication, and be located this part's water-supply pipe intercommunication branch water pipe, branch water pipe is by the tube coupling heat pump, and be located this part's pipeline and install seventh control valve (11).
The heat pump comprises three groups, namely a heat pump 23, a heat pump 24 and a heat pump 25, wherein the hot end input of the evaporator of each heat pump (23, 24, 25) is a branch water pipe, and the cold end output of the evaporator of each heat pump is connected with a cooling tower (6). And a twelfth control valve (16) is arranged on a communication pipeline between the cold end output of the evaporator of the heat pump and the cooling tower (6). The hot end output of the condenser of the heat pump (23, 24, 25) is a water collector (26), a fourth circulating pump (27) is installed on a front end pipeline of the water collector (26), the front end of the fourth circulating pump (27) is communicated with a circulating water inlet of a water storage tank (37) of the solar waste heat recovery device, the cold end input of the condenser of the heat pump (23, 24, 25) is a first water divider (28), and the first water divider (28) is connected with the other outlet of a water dividing valve (43) of a second water divider (44) of the lithium bromide heat pump heating device.
The inlet of the cooling tower (6) is connected with the water feeding pipe in parallel at least, a group of control valve groups are installed on each water feeding pipe, each group of control valve groups at least comprises two-way parallel two-stage control valves, the valves of each two-stage control valves are communicated with each other through the water feeding pipe, the water feeding pipes located on the part are communicated with branch water pipes, the branch water pipes are connected with a plurality of paths of heat pumps in parallel through pipelines, and the pipelines located on the part are provided with seventh control valves (11). Specifically, the water feeding pipe comprises a first road water feeding pipe and a second road water feeding pipe which are connected in parallel, the first road water feeding pipe is provided with a first group of control valve sets, the first group of control valve sets comprise a first road two-stage control valve and a second road two-stage control valve which are connected in parallel, the first road two-stage control valve comprises an eighth control valve (12) and a third control valve (7), and the second road two-stage control valve comprises a ninth control valve (13) and a fourth control valve (8); a second group of control valve sets are installed on the second water supply pipe, each second group of control valve sets comprises a first two-stage control valve and a second two-stage control valve which are connected in parallel, each first two-stage control valve comprises a tenth control valve (14) and a fifth control valve (9), and each second two-stage control valve comprises an eleventh control valve (15) and a sixth control valve (10); the heat pump comprises a first heat pump (23), a second heat pump (24) and a third heat pump (25).
Float glass waste heat recovery device still includes prepares water tank (2), the outlet pipe of preparing water tank (2) lets in cold pool (21), the second delivery port intercommunication second water pipe in float glass workshop (1), the second outlet pipe with prepare the outlet pipe intercommunication of water tank (2), the second water pipe both sides the outlet pipe, one side installation first control valve (3), opposite side installation second control valve (4), install first circulating pump (5) on the outlet pipe of second control valve (4) low reaches. The hot pool (22) and the cold pool (21) are separated by a heat insulation layer (20), and an overflow gap (19) communicated with the two pools is arranged on the heat insulation layer (20).
The execution method of the device comprises the following steps: a float glass waste heat recovery method comprises the steps that circulating water at 37-39 ℃ generated in a float glass workshop (1) is introduced into a hot pool (22) through a first water pipe, a second circulating pump (17) and a third circulating pump (18) are pressurized, after pressurization is finished, an eighth control valve (12), a ninth control valve (13), a tenth control valve (14) and an eleventh control valve (15) are opened, a third control valve (7), a fourth control valve (8), a fifth control valve (9) and a sixth control valve (10) are closed, a seventh control valve (11) is opened, the circulating water at 37-39 ℃ in the hot pool (22) is extracted by the circulating pump of a water supply pipe and is extracted to evaporators in a first heat pump (23), a second heat pump (24) and a third heat pump (25) to serve as the hot end input of the evaporators, the circulating water at 37-39 ℃ exchanges heat with intermediate water at 24-26 ℃ at the cold end of a condenser, after heat exchange, the hot end of the condenser outputs medium water with the temperature of 33-35 ℃, the cold end of the evaporator outputs circulating water with the temperature of 31-33 ℃ and the circulating water is supplied to a cooling tower (6), and is discharged into a cold pool (21) after being cooled by a cooling tower (6), the circulating water of the cold pool (21) is pressurized by a first circulating pump (5), a second control valve (4) is opened, the circulating water of the cold pool (21) is conveyed to a float glass workshop (1) to be used as cooling water for float glass production, when heat exchange is not needed, opening an eighth control valve (12), a ninth control valve (13), a tenth control valve (14), an eleventh control valve (15), a third control valve (7), a fourth control valve (8), a fifth control valve (9) and a sixth control valve (10), and the seventh control valve (11) is closed, and circulating water at 37-39 ℃ in the hot pool (22) is pumped by a circulating pump of the water feeding pipe and is directly pumped to the cooling tower (6) for cooling. The cold end of the evaporator outputs circulating water with the temperature of about 31-33 ℃ and supplies the circulating water to the cooling tower (6), the temperature of the cooling water in the process flow production is required to be 20-30 ℃, namely the temperature of the water in the cold pool (21) is kept in a relatively stable temperature environment of 20-30 ℃, if the temperature of the circulating water output by the cold end of the evaporator is higher than 30 ℃, the circulating water is cooled by the cooling tower (6) and then discharged into the cold pool (21), and if the temperature of the circulating water output by the cold end of the evaporator is lower than 30 ℃, the circulating water is directly discharged into the cold pool (21) through the cooling tower (6).
The hot ends of the condensers of the first heat pump (23), the second heat pump (24) and the third heat pump (25) output the intermediate water with the temperature of 33-35 ℃ and are collected by a water collector (26). The pipeline of the front end of the water collector is provided with a fourth circulating pump (27) used for pumping intermediate water in the water collector (26), and the front end of the fourth circulating pump is connected with a water storage tank (37) of the solar waste heat recovery device. The intermediate water of 24-26 ℃ input by the cold ends of the condensers of the first heat pump (23), the second heat pump (24) and the third heat pump (25) is supplied by a first water separator (28), the first water divider (28) is connected with the other outlet of the water dividing valve of the second water divider (44) of the lithium bromide heat pump heating device, the return water after heat exchange of the lithium bromide heat pump heating device is used as the intermediate water at the temperature of 24-26 ℃, the intermediate water for float glass waste heat recovery is reheated by the solar waste heat recovery device, part of heat is exchanged with high-temperature hot water of a power plant in the lithium bromide heat pump heating device to be sent to a user pipeline, the float glass waste heat and the solar waste heat are used as heating heat sources, and the intermediate water with relatively stable low temperature after heat exchange is used for the cold end output of the condenser end of the heat pump unit, and circularly participates in heat exchange, thereby saving water quantity and heat.
In the power-off state, the second control valve (4) is closed, the first control valve (3) is opened, and the water in the prepared water tank (2) can provide cooling water for the float glass workshop (1) for 15 minutes. The hot pond (22) and the cold pond (21) are separated by a heat insulation layer (20), the heat insulation layer (20) is provided with an overflow port (19) for communicating the two ponds, and water in the hot pond (22) or the cold pond (21) is excessive and exceeds the overflow port (19) to enter the corresponding pond, so that the water is not directly overflowed from the pond due to excessive water in the single pond.
The solar waste heat recovery device comprises a solar water heater (34), a phase change heat storage device (31), a water storage tank (37), a temperature sensor (29), a fifth circulating pump (30), a thirteenth control valve (32), a fourteenth control valve (33) and a fifteenth control valve (35), wherein a circulating outlet of the water storage tank (37) is connected with the solar water heater (34) through a pipeline, a fifteenth control valve (35) is arranged on the pipeline section, a water outlet pipe of the solar water heater (34) is branched into two parallel water pipes, a thirteenth control valve (32) is arranged on one water pipe, and is connected with the fifth circulating pump (30), a fourteenth control valve (33) is arranged on the other water pipe, and is connected with a phase change heat storage device (31), the phase change heat storage device (31) is connected with the fifth circulating pump (30), and the outlet of the fifth circulating pump (30) is connected with the circulating inlet of the water storage tank (37). The inlet of the water storage tank (37) is connected with a water collector (26), the water collector (26) is the water collector (26) of the float glass waste heat recovery device, and the water collector (26) is connected with the high-temperature output ends of the condensers of the three groups of heat pumps of the float glass waste heat recovery device.
The outlet of the water storage tank (37) is communicated with a first inlet of a water mixer (42) of the lithium bromide heat pump heating device. And a sixteenth control valve (36) is arranged on a communication pipeline between the water storage tank (37) and the water mixer (42), namely a water supply pipeline connected with an outlet of the water storage tank (37), and the sixteenth control valve (36) is arranged on the water supply pipeline and is used for controlling the water quantity and the water storage speed of the solar waste heat recovery device for supplying water to the lithium bromide heat pump heating device. The cogeneration unit (41) is connected to a power plant wherein the steam temperature is about 100 ℃ and the water temperature in the water storage tank (37) is about 45 ℃. A temperature sensor (29) is installed in the water storage tank (37) to measure the temperature of the stored water.
The execution method of the device comprises the following steps: the solar energy waste heat recovery method comprises the following steps:
and (3) a normal mode: when the solar radiation intensity is relatively moderate, i.e. when day 7: 00 to day 11: 00 and day 15: 00 to day 19: when the temperature is 00 hours, opening a fifteenth control valve (35), closing a fourteenth control valve (33), opening a thirteenth control valve (32), so that water in a water storage tank (37) is extracted from a circulating outlet of the water storage tank (37) by a fifth circulating pump (30), the water in the water storage tank (37) is heated by a solar water heater (34), the heated water is directly extracted to the water storage tank (37) through a pipeline provided with the thirteenth control valve (32), and the heated water flows back to the water storage tank (37) from a circulating water inlet of the water storage tank (37); circulating the stored water heating cycle until the mode is changed or the measured value of the temperature sensor (29) in the water storage tank (37) reaches a set threshold value;
and (3) energy storage mode: when the intensity of solar radiation is relatively excessive, i.e. when day 11: 00 to 15: when the temperature is 00 hours, opening a fifteenth control valve (35), closing a thirteenth control valve (32), opening a fourteenth control valve (33), starting a phase change heat storage device (31), enabling water in a water storage tank (37) to be extracted from a circulating outlet of the water storage tank (37) by a fifth circulating pump (30), heating the water in the water storage tank (37) by a solar water heater (34), and enabling the phase change heat storage device (31) to store excessive heat energy through a pipeline provided with the phase change heat storage device (31) so as to keep the outlet water temperature at a set temperature; circulating the water storage heating circulation until the mode is changed;
a heat generation mode: when the intensity of solar radiation is relatively insufficient, i.e. when the day 19: 00 to the next day 7: 00 hours or when the temperature sensor (29) measures that the water temperature is continuously lower than 40 ℃ within half an hour; closing the thirteenth control valve (32), opening the fourteenth control valve (33), starting the phase-change heat storage device (31), so that water in the water storage tank (37) is pumped out by the fifth circulating pump (30) from a circulating outlet of the water storage tank (37), the water in the water storage tank (37) is heated by the solar water heater (34), and heat energy stored in a heat storage mode is released by the phase-change heat storage device (31) through a pipeline provided with the phase-change heat storage device (31), so that the outlet water temperature is increased and kept at the set temperature; and circulating the stored water heating circulation until the mode is changed.
In the three modes, the inlet of the water storage tank (37) is communicated with the water collector (26) to supply water to the water storage tank (37). The outlet of the water storage tank (37) is communicated with the first inlet of a water mixer (42) of the lithium bromide heat pump heating device and used for conveying and storing water, and the stored water is 45 ℃.
The lithium bromide heat pump heating device comprises a lithium bromide heat pump (38), a plate heat exchanger (39), a water mixer (42) and a second water separator (44); the lithium bromide heat pump (38) comprises a high-temperature heat exchange section, a low-temperature heat exchange section and a medium-temperature heat exchange section, the plate heat exchanger (39) comprises a hot water flow passage and a cold water flow passage, and the water mixer (42) comprises a first inlet, a second inlet and an outlet; a cold water flow channel of the plate heat exchanger (39) is connected with a second output pipeline; the inlet of the high-temperature heat exchange section is connected with a cogeneration device (41), the outlet of the high-temperature heat exchange section is connected with the inlet of a hot water flow passage of the plate heat exchanger (39), the outlet of the hot water flow passage of the plate heat exchanger (39) is connected with the second inlet of the water mixer (42), the outlet of the water storage tank (37) is communicated with the first inlet of the water mixer (42), the outlet of the water mixer (42) is connected with the inlet of the low-temperature heat exchange section, the outlet of the low-temperature heat exchange section is connected with the second water divider (44), the second water divider (44) is provided with a bidirectional water dividing valve (43), one outlet of the water dividing valve (43) is connected with a power plant condensed gas return pipe (45), and the other outlet of the water dividing valve (; the medium-temperature heat exchange section of the lithium bromide heat pump (38) is connected with a first output pipeline, and the cold water flow passage of the plate type heat exchanger (39) is connected with a second output pipeline. And a sixth circulating pump (46) is arranged in a pipeline connecting the outlet of the water dividing valve (43) and the water divider (28). One outlet of the diverter valve (43) is connected to the diverter (28) and the diverter is connected to the cold side of the condenser of the heat pump (23, 24, 25). The first output pipeline and the second output pipeline are connected with the user side pipeline and output heat exchange heat energy in a grading mode. And the user end pipeline is provided with a heat supply pipeline. The cogeneration device (41) is connected to a power plant, wherein the temperature of steam is about 100 ℃, the temperature of water output from the water storage tank (37) is about 45 ℃, the input temperature of a high-temperature heat exchange section of the lithium bromide heat pump (38) is about 100 ℃, the output temperature is about 70 ℃, the input temperature of a low-temperature heat exchange section is about 46 ℃, the output temperature is about 25 ℃, the input temperature of a medium-temperature heat exchange section is about 36 ℃, and the output temperature of the medium-temperature heat exchange section is about 45 ℃; the output temperature of the mixed water of the water mixer (42) is about 46 ℃, the input temperature of a hot water flow passage of the plate type heat exchanger (39) is about 70 ℃, the output temperature is about 50 ℃, the input temperature of a cold water flow passage of the plate type heat exchanger (39) is about 36 ℃, the output temperature is about 45 ℃, and the input temperature of the second water separator (44) is about 25 ℃.
By the aforesaid, lithium bromide heat pump heating system is to the storage water, carried out the heat transfer between user side and the power plant water, with the heat supply user side of high temperature power plant water and storage water, through the lithium bromide heat pump promptly, the heat transfer is accomplished to plate heat exchanger, and return power plant and first water knockout drum respectively with the low temperature moisture after the heat transfer, make the low temperature water after the heat transfer continue to participate in the circulation, not only accomplished high temperature heat and low temperature thermal output in the lump, still by cyclic utilization with water, water source and thermal saving and make full use of have been realized. And in order to be able to directly adapt the low-temperature water to the lithium bromide heat pump, a solar energy waste heat recovery device is added between the float glass waste heat recovery device and the lithium bromide heat pump heating device so as to supplement partial heat with clean energy.
The execution method of the device comprises the following steps: a lithium bromide heat pump heating method comprises the steps that a condenser lead-in pipe of a power plant is communicated with a high-temperature heat exchange section of a lithium bromide heat pump (38), high-temperature heat exchange water (100 ℃) is conveyed to the high-temperature heat exchange section, an outlet of the high-temperature heat exchange section is communicated with an inlet of a hot water flow passage of a plate type heat exchanger (39), the high-temperature heat exchange water (70 ℃) after high-temperature heat exchange is conveyed to the hot water flow passage, an outlet of the hot water flow passage of the plate type heat exchanger (39) is communicated with a second inlet of a water mixer (42) and conveys plate type heat exchange water (50 ℃) to the water mixer (42), an outlet of a water storage tank (37) is communicated with a first inlet of the water mixer (42) and conveys storage water (45 ℃) to the water mixer (42), the plate type heat exchange water and the storage water form mixed water (46 ℃) in the water mixer (42), an outlet of the water mixer (42) is communicated with a low, the outlet of the low-temperature heat exchange section is communicated with the water separator (44) and outputs low-temperature heat exchange water (25 ℃), the second water separator (44) separates water which is equal to the amount input by the cogeneration device (41) and conveys the water back to the power plant through a power plant condensed gas return pipe (45), the rest water is conveyed to the water separator (28) through a pipeline to serve as return water, the return water (25 ℃) received by the first water separator (28) serves as return water, and the return water is conveyed to the cold ends of condensers of the first heat pump (23), the second heat pump (24) and the third heat pump (25) to serve as intermediary water. The medium-temperature heat exchange section of the lithium bromide heat pump (38) is connected with a first output pipeline, the high-temperature heat exchange section and the low-temperature heat exchange section exchange heat for the medium-temperature heat exchange section and supply the heat to a user-side fan coil (output temperature is 45 ℃), water in a hot water flow passage of the plate heat exchanger (39) exchanges heat for water in a cold water flow passage, the input temperature of the cold water flow passage is about 36 ℃, the output temperature is 45 ℃, and heat exchange heat energy is output in a grading manner.
The lead-in pipe of the condenser of the power plant is communicated with the high-temperature heat exchange section of the lithium bromide heat pump (38) and conveys 100 ℃ high-temperature heat exchange water to the high-temperature heat exchange section, the outlet of the high-temperature heat exchange section is communicated with the inlet of the hot water flow passage of the plate heat exchanger (39) and conveys 70 ℃ high-temperature heat exchange water after high-temperature heat exchange to the hot water flow passage, the outlet of the hot water flow passage of the plate heat exchanger (39) is communicated with the second inlet of the water mixer (42) and conveys 50 ℃ plate type heat exchange water to the water mixer (42), the outlet of the water storage tank (37) is communicated with the first inlet of the plate type heat exchange water mixer (42) and conveys 45 ℃ storage water to the water mixer (42), the plate type heat exchange water and the storage water form 46 ℃ mixed water in the water mixer (42), the outlet of the water mixer (42) is communicated with the low-temperature section of the lithium bromide heat pump (38) and conveys 46 ℃ mixed water as a low-temperature heat source, the outlet of the low-, the second water separator (44) separates water with the same quantity as that input by the cogeneration device (41), the water is conveyed back to the power plant by a power plant condensed gas return pipe (45), and the rest water is conveyed to the first water separator (28) by a pipeline to be used as return water.
The medium-temperature heat exchange section of the lithium bromide heat pump (38) is connected with a first output pipeline, the high-temperature heat exchange section and the low-temperature heat exchange section exchange heat for the medium-temperature heat exchange section and supply the heat to a fan coil of a user end, the output temperature is 45 ℃, water in a hot water flow passage of the plate type heat exchanger (39) exchanges heat for water in a cold water flow passage, the output temperature of the cold water flow passage is about 36 ℃, and heat exchange heat energy is output in a grading manner.
The first water separator (28) receives return water at 25 ℃, and the return water is conveyed to the cold ends of the condensers of the first heat pump (23), the second heat pump (24) and the third heat pump (25) to be used as intermediate water.
The cogeneration device of the power plant in the scheme comprises exhaust steam devices (1-6), steam turbines (1-7), steam heat pump units (1-1), third lithium bromide heat pump units (1-2), second lithium bromide heat pump units (1-3) and first lithium bromide heat pump units (1-4), wherein each lithium bromide heat pump unit comprises a high-temperature heat source, a low-temperature heat source and a medium-temperature heat source, the heat exchange pipelines of the exhaust steam devices (1-6) are communicated with the evaporator of the steam heat pump units (1-1) and the low-temperature heat source of each lithium bromide heat pump unit in parallel, the heat exchange pipelines of the steam turbines (1-7) are communicated with the high-temperature heat sources of each lithium bromide heat pump unit in parallel, the high-temperature water outlets of condensers are communicated with the medium-temperature inlets of the first lithium bromide heat pump units (1-4), the outlet of the first lithium bromide heat pump unit (1-4) is communicated with the inlet of the medium-temperature heat source of the second lithium bromide heat pump unit (1-3), and the outlet of the medium-temperature heat source of the second lithium bromide heat pump unit (1-3) is communicated with the inlet of the medium-temperature heat source of the third lithium bromide heat pump unit (1-2).
An inlet of the steam exhaust device (1-6) is connected with an inlet pipe, an outlet of the steam exhaust device is connected with an outlet pipe, the inlet pipe and the outlet pipe are arranged in parallel, the inlet pipe is communicated with an outlet of a low-temperature heat source of the first lithium bromide heat pump unit (1-4), the outlet pipe is communicated with an inlet of a low-temperature heat source of the first lithium bromide heat pump unit (1-4), an inlet of a low-temperature heat source of the second lithium bromide heat pump unit (1-3) is connected into the outlet pipe in parallel, an outlet of the low-temperature heat source of the second lithium bromide heat pump unit (1-3) is connected into the inlet pipe in parallel, an inlet of a low-temperature heat source of the third lithium bromide heat pump unit (1-2) is connected into the outlet pipe in parallel, an outlet; the inlet of the steam turbine (1-7) is connected with an inlet pipe, the outlet of the steam turbine is connected with an outlet pipe, the inlet pipe and the outlet pipe are arranged in parallel, the inlet pipe is communicated with the steam outlet of the steam-water heat exchanger (1-5), the outlet pipe is communicated with the steam inlet of the steam-water heat exchanger (1-5), the inlet of the high-temperature heat source of the first lithium bromide heat pump unit (1-4) is connected into the outlet pipe in parallel, the outlet of the high-temperature heat source of the second lithium bromide heat pump unit (1-3) is connected into the inlet pipe in parallel, the outlet of the high-temperature heat source of the third lithium bromide heat pump unit (1-2) is connected into the outlet pipe in parallel, the outlet of the high-temperature heat source of the third lithium bromide heat pump unit (1-2) is connected into, the outlet of the evaporator of the steam heat pump unit (1-1) is connected with the inlet pipe.
The low-temperature water inlet of the condenser of the steam heat pump unit (1-1) is connected with a water inlet pipeline (about 5 degrees).
And a low-temperature heat source of the third lithium bromide heat pump unit (1-2) is also connected with a water inlet pipeline (about 25 degrees).
The execution method of the cogeneration device of the power plant comprises the following steps: the method comprises the following steps that power plant water with the temperature of about 5 ℃ enters a cold water inlet of a condenser of a steam heat pump unit (1-1), waste steam water generated by a waste steam device (1-6) exchanges heat with the power plant water with the temperature of about 5 ℃ at an evaporator end of the steam heat pump unit (1-1), primary heat exchange water with the temperature of about 30 ℃ is output from a condenser end of the steam heat pump unit (1-1), and the primary heat exchange water enters an intermediate temperature heat source of a first lithium bromide heat pump unit (1-4) and serves as inlet water of the first lithium bromide heat pump unit; waste steam water generated by the waste steam devices (1-6) enters a first lithium bromide heat pump unit (1-4) to be used as a low-temperature heat source, high-temperature steam with the temperature of 100 ℃ generated by a steam turbine (1-7) enters the first lithium bromide heat pump unit (1-4) to be used as a high-temperature heat source, and secondary heat exchange water with the temperature of about 50 ℃ is discharged from a medium-temperature heat source of the first lithium bromide heat pump unit (1-4); the dead steam water generated by the dead steam device (1-6) enters a second lithium bromide heat pump unit (1-3) to be used as a low-temperature heat source, the high-temperature steam generated by the steam turbine (1-7) enters the second lithium bromide heat pump unit (1-3) to be used as a high-temperature heat source, and the effluent water of the medium-temperature heat source of the second lithium bromide heat pump unit (1-3) is three-stage heat exchange water at about 70 ℃; the dead steam water generated by the dead steam device (1-6) enters a third lithium bromide heat pump unit (1-2) to be used as a low-temperature heat source, the high-temperature steam generated by a steam turbine (1-7) enters the third lithium bromide heat pump unit (1-2) to be used as a high-temperature heat source, the effluent water of the medium-temperature heat source of the third lithium bromide heat pump unit (1-2) is four-stage heat exchange water at about 90 ℃, the four-stage heat exchange water enters a steam-water heat exchanger (1-5) to exchange heat with the high-temperature steam generated by the steam turbine (1-7), and the steam-water heat exchanger (1-5) outputs hot water at 100 ℃.
The embodiment provides a heating system is united in coupling of high-temperature steam of power plant and low temperature waste heat that float glass factory produced, both can satisfy the heat supply demand and reduce the use of power plant high-temperature steam again, reduces the heating cost by a wide margin.
A heat exchange machine room is built in a float glass plant area, industrial waste heat (38 ℃) in circulating water of a cooling tower in the float glass plant area is cooled to 32 ℃ through a heat exchanger in winter, the temperature of intermediate water is raised to 35 ℃ from 25 ℃, the temperature is reduced to 31-33 ℃ after heat exchange, and the intermediate water is conveyed back to the float glass heat exchange machine room, so that a large amount of low-temperature heat sources are obtained. The low-temperature waste heat generated by the float glass has the following advantages:
the heating and ventilation system is not changed: only the pipeline part of the cooling tower is modified, and other systems are not affected.
The electric power operation cost is not increased: and a heat exchanger machine room is additionally arranged in a plant area, and a cooling tower does not run in a heating season, so that the electric charge is saved.
The other side equipment is not increased or decreased: the cooling tower is not cancelled, and the device can be continuously used in non-heating seasons without influencing other equipment.
The working temperature is not changed: the temperature of the heat exchanger is kept at 32 ℃ after heat exchange, the use requirement is not influenced, and the energy consumption is not increased.
By adopting the scheme, a large amount of waste heat can be recovered without changing the original operation condition of a factory, increasing the power consumption and influencing the product yield. The technical scheme of this embodiment can provide the high-temperature steam coupling heat supply that a large amount of low temperature heat sources and power plant provided, under the condition that does not influence the heat supply effect, greatly reduced the quantity of power plant's high-temperature steam, make full use of the low temperature heat source that float glass factory produced again, reduced the heat supply cost, improved economic benefits. Therefore, the invention has the function of not underestimating the target of energy conservation and emission reduction.
Example 2:
the whole system consists of a float glass waste heat recovery device, a solar waste heat recovery device and a lithium bromide heat pump heating device.
The float glass waste heat recovery device mainly works according to the following principle: when waste heat recovery is carried out under working conditions in winter, circulating water containing a large amount of low-temperature waste heat at 37-39 ℃ generated in the float glass workshop 1 is discharged into the hot pond 22 and is pressurized by the third circulating pump 18 and the second circulating pump 17, at the moment, the eighth control valve 12, the ninth control valve 13, the tenth control valve 14 and the eleventh control valve 15 are opened, and the third control valve 7, the fourth control valve 8, the fifth control valve 9 and the sixth control valve 10 are closed; the circulating water is introduced into a first heat pump 23, a second heat pump 24 and a third heat pump 25, exchanges heat with intermediate water at the temperature of 24-26 ℃ to form return water at the temperature of about 31-33 ℃, is introduced into a cooling tower 6 through a control valve 16, and is discharged into a cold pool 21. The water from the cold pool 21 is pressurised by a circulation pump 5 through an open second control valve 4 and fed to the float glass plant 1 as float glass production cooling water. In the power-off state, the second control valve 4 is closed, the first control valve 3 is opened, and the water in the preliminary water tank 2 can supply cooling water to the plant 1 for 15 minutes.
The main working principle of the solar waste heat recovery device is as follows: the first heat pump 23, the second heat pump 24 and the third heat pump 25 heat the cooling water of 24-25 ℃ led out by the first water separator 28 to 34-36 ℃, and then the cooling water is sent into the water collector 26, and then is pressurized by the fourth circulating pump 27 and sent into the water storage tank 37; the water in the water storage tank 37 is heated to 45 ℃ by the solar device, the sixteenth control valve 36 is opened, and the water is sent to the water mixer 42 for mixing.
The solar energy waste heat recovery device has the following 3 working modes:
1. normal mode
When the intensity of the solar radiation is proper, the control valve 33 is closed, the control valve 32 is opened, and the device directly heats the water in the water tank 37 without opening the phase change heat storage device 31.
2. Mode of energy storage
When the solar radiation intensity is too high, the control valve 32 is closed, the control valve 33 is opened, the system opens the phase change heat storage device 31 to store excessive heat energy, and the evaporation temperature is kept at a certain temperature to improve the operation efficiency of the solar waste heat recovery device.
3. Heating mode
When the solar radiation intensity is insufficient or the temperature sensor 29 measures that the water temperature is too low for a certain period of time, the thirteenth control valve 32 is closed and the fourteenth control valve 33 is opened. The system starts the phase change heat storage device 31 and releases the heat energy stored in the heat storage mode, so that the evaporation temperature is increased and kept at a certain temperature to improve the operation efficiency of the solar waste heat recovery device.
The lithium bromide heat pump heating device mainly works according to the following principle: high-temperature steam at about 100 ℃ is introduced into the power plant from the cogeneration unit 41 to serve as a high-temperature heat source of the lithium bromide heat pump 38; the water outlet temperature of the high-temperature heat source water outlet end of the lithium bromide heat pump is about 70 ℃, the water enters the plate heat exchanger 39 to exchange heat with the return water of about 36 ℃ of the user end pipeline 40 to obtain hot water of about 45 ℃ for the user end fan coil, the water outlet temperature is about 50 ℃, the hot water is sent to the water mixer 42 to be mixed with the intermediate water containing float glass waste heat of about 45 ℃ (the water temperature is about 46 ℃ after mixing), the mixed water is sent to the lithium bromide heat pump 38 to be used as a low-temperature heat source, the water outlet temperature is about 25 ℃, and the outlet water is sent to the second water divider 44. The water separated by the second water separator 44 is sent to the power plant condensed gas return pipe 45 in an amount equal to the amount of water introduced by the cogeneration device 41, and then the water is sent back to the power plant, and the remaining water separated by the second water separator 44 is sent to the water separator 28 under pressure to complete the medium water circulation. The return water temperature of a user end pipeline at the lithium bromide heat pump end is about 45 ℃, and the inlet water temperature is about 36 ℃. On the other hand, the low-quality heat of float glass and solar energy and the high-quality heat of steam of a power plant are used as heat sources, and the heat exchange means ensures that the low-quality heat can not be used uselessly, the energy is extremely used, and the step energy is also utilized. In the process, for the heat of the cogeneration device and the float glass, the cold quantity is used once in the recycling of the low-temperature water after heat exchange, the recycling of the circulating water is realized, and the water resource is saved. When the high-temperature steam of the power plant is used, the heat quality of the cogeneration device is gradually improved so as to form high-temperature water suitable for heat exchange, and the temperature of the high-temperature water can reach or approach 100 ℃.
During the heating in winter, the operation is performed in the above manner, during the non-heating period, the control valve 16 and the control valve 11 are closed, the water in the float glass hot pool 22 at 37-39 ℃ is cooled to 31-33 ℃ in the cooling tower 6 and then sent into the cold pool 21, and the cooling tower can be controlled and adjusted by opening and closing the third control valve 7, the fourth control valve 8, the fifth control valve 9, the sixth control valve 10, the seventh control valve 11, the eighth control valve 12, the ninth control valve 13, the tenth control valve 14 and the eleventh control valve 15.
In the aspect of price, the condensate water of the power plant is expensive, the float glass water is low in price, the water of the power plant is only used as a high-temperature heat source of the lithium bromide heat pump, and the intermediate water obtained by the waste heat of the float glass is used as a low-temperature heat source. Greatly reduces the water consumption of the power plant and improves the economic benefit. The water of the power plant enters the plate heat exchanger for further heat exchange after being used as the high-temperature heat source of the lithium bromide heat pump for heat exchange, and then is mixed with the intermediate water obtained by float glass waste heat recovery, so that the water inlet temperature of the low-temperature heat source of the lithium bromide heat pump is increased, the water utilization efficiency of the power plant is further improved, the stepped utilization of high-grade energy of the water of the power plant is realized, the water energy efficiency maximization of the power plant is ensured, and the economic benefit is improved. The system integrally uses three sets of heating devices, so that the reliability of heating is greatly improved, and the important civil problem of stable heating is guaranteed. The use of a plate heat exchanger 39 instead of a heat pump reduces the initial installation costs and the subsequent operating costs.
In one embodiment, any temperature in this application, using a non-exact representation of the temperature around or about or equivalent to the temperature, is defined, such as around 45 ℃ or about 45 ℃, then represents an interval of ± 1 degree of the temperature, i.e. 44-46 ℃ for example, and the specific temperature value directly represents its numerical temperature, whereas in a further preferred embodiment, a direct numerical representation of the temperature referred to in this application is understood to be an interval of ± 1 degree of its temperature, such as 45 degrees of water for heat exchange, representing 44-46 ℃ for example, except with hot water that must be represented by the numerical value, e.g. 100 ℃.
The above description is only for the purpose of creating a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (1)
1. A heating method of a thermoelectric combined water mixing and water diversion type heat pump is characterized in that a condenser lead-in pipe of a power plant is communicated with a high-temperature heat exchange section of a lithium bromide heat pump (38) and conveys high-temperature heat exchange water to the high-temperature heat exchange section, an outlet of the high-temperature heat exchange section is communicated with an inlet of a hot water flow passage of a plate heat exchanger (39) and conveys high-temperature heat exchange water after high-temperature heat exchange to the hot water flow passage, an outlet of the hot water flow passage of the plate heat exchanger (39) is communicated with a second inlet of a water mixer (42) and conveys plate type heat exchange water to the water mixer (42), an outlet of a water storage tank (37) is communicated with a first inlet of the water mixer (42) and conveys storage water to the water mixer (42), the plate type heat exchange water and the storage water form mixed water in the water mixer (42), an outlet of the water mixer (42) is communicated with a low-temperature heat exchange section of the lithium bromide, an outlet of the low-temperature heat exchange section is communicated with the water separator (44) and outputs low-temperature heat exchange water to the water separator, the second water separator (44) separates water which is equal to the amount of the water input by the cogeneration device (41), the water is conveyed back to the power plant through a condensed gas return pipe (45) of the power plant, and the rest water is conveyed to the water separator (28) through a pipeline to be used as return water;
the cogeneration apparatus performs the following method: the method comprises the following steps that power plant water with the temperature of about 5 ℃ enters a cold water inlet of a condenser of a steam heat pump unit, waste steam water generated by a waste steam device exchanges heat with the power plant water with the temperature of about 5 ℃ at an evaporator end of the steam heat pump unit, primary heat exchange water with the temperature of about 30 ℃ is output from a condenser end of the steam heat pump unit, and the primary heat exchange water enters a medium-temperature heat source of a first lithium bromide heat pump unit and serves as inlet water of the first lithium bromide heat pump unit; the waste steam water generated by the waste steam device enters a first lithium bromide heat pump unit as a low-temperature heat source, high-temperature steam with the temperature of 100 ℃ generated by a steam turbine enters the first lithium bromide heat pump unit as a high-temperature heat source, and secondary heat exchange water with the temperature of about 50 ℃ is discharged from a medium-temperature heat source of the first lithium bromide heat pump unit; the waste steam water generated by the waste steam device enters a second lithium bromide heat pump unit to be used as a low-temperature heat source, the high-temperature steam generated by the steam turbine enters the second lithium bromide heat pump unit to be used as a high-temperature heat source, and the effluent of a medium-temperature heat source of the second lithium bromide heat pump unit is three-stage heat exchange water at about 70 ℃; and the waste steam water generated by the waste steam device enters a third lithium bromide heat pump unit to be used as a low-temperature heat source, the high-temperature steam generated by the steam turbine enters the third lithium bromide heat pump unit to be used as a high-temperature heat source, the effluent water of a medium-temperature heat source of the third lithium bromide heat pump unit is four-stage heat exchange water at about 90 ℃, the four-stage heat exchange water enters a steam-water heat exchanger to exchange heat with the high-temperature steam generated by the steam turbine, and the hot water at 100 ℃ is output by the steam-water heat exchanger.
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