CN111351255A - Lithium bromide heat pump heating method for recovering solar waste heat - Google Patents
Lithium bromide heat pump heating method for recovering solar waste heat Download PDFInfo
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- CN111351255A CN111351255A CN201811565717.5A CN201811565717A CN111351255A CN 111351255 A CN111351255 A CN 111351255A CN 201811565717 A CN201811565717 A CN 201811565717A CN 111351255 A CN111351255 A CN 111351255A
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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
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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
- 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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- 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]
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Abstract
Lithium bromide heat pump heating method of solar energy waste heat recovery belongs to heat supply waste heat recovery and heat distribution field, in order to solve and improve the temperature of intaking, with the heat supply user end of high temperature power plant water and storage water to low temperature water after the heat transfer returns power plant and first water knockout drum respectively, makes the low temperature water after the heat transfer continue to participate in the problem of circulation, the mode of generating heat: when the intensity of solar radiation is relatively insufficient, i.e. when the day 19: 00 to the next day 7: when the temperature is 00 hours or the temperature sensor measures that the water temperature is continuously lower than 40 ℃ within half an hour; and closing the thirteenth control valve, connecting the low-temperature water outlet of the evaporator with the second output, outputting low-temperature heat exchange water, connecting the low-temperature water outlet of the evaporator with the second output, outputting storage water (45 ℃) and recycling water, thereby realizing the saving and full use of water sources and heat.
Description
Technical Field
The invention belongs to the field of heat supply waste heat recovery and heat distribution, and relates to a lithium bromide heat pump heating method with solar waste heat recovery.
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 problem that the water inlet temperature is increased, heat of high-temperature power plant water and stored water is supplied to a user side, and low-temperature water after heat exchange is respectively returned to a power plant and a first water separator, so that the low-temperature water after heat exchange continuously participates in circulation, the invention provides the following technical scheme:
a lithium bromide heat pump heating method for recovering solar energy waste heat comprises a solar energy waste heat recovery method and a lithium bromide heat pump heating method;
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 of the water in the water storage tank is 00 hours, opening a fifteenth control valve, closing a fourteenth control valve, opening a thirteenth control valve, so that water in the water storage tank is extracted by a fifth circulating pump from a circulating outlet of the water storage tank, heating the water in the water storage tank by a solar water heater, directly extracting the heated water to the water storage tank through a pipeline provided with the thirteenth control valve, and returning the heated water to the water storage tank through a circulating water inlet of the water storage tank; circulating the water storage heating circulation until the mode is changed or the measured value of the temperature sensor in the water storage tank 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 of the discharged water is 00 hours, opening the fifteenth control valve, closing the thirteenth control valve, opening the fourteenth control valve, starting the phase change heat storage device, pumping out the water in the water storage tank from a circulating outlet of the water storage tank by a fifth circulating pump, heating the water in the water storage tank by the solar water heater, and storing excessive heat energy by the phase change heat storage device through a pipeline provided with the phase change heat storage device to keep the temperature of the discharged water at the 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: when the temperature is 00 hours or the temperature sensor measures that the water temperature is continuously lower than 40 ℃ within half an hour; closing the thirteenth control valve, opening the fourteenth control valve, starting the phase change heat storage device, so that water in the water storage tank is extracted by the fifth circulating pump from a circulating outlet of the water storage tank, the water in the water storage tank is heated by the solar water heater, and heat energy stored in a heat storage mode is released by the phase change heat storage device through a pipeline provided with the phase change heat storage device, 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 is communicated with the water collector to supply water to the water storage tank. The outlet of the water storage tank is communicated with the inlet of the low-temperature heat exchange section of the lithium bromide heat pump, and water is conveyed to the water storage tank 37 by the water collector 26 for storage;
the lithium bromide heat pump heating method comprises the steps that a steam-water heat exchanger is communicated with a high-temperature heat exchange section of a lithium bromide heat pump and is used for conveying high-temperature heat exchange water (100 ℃), an outlet of the high-temperature heat exchange section is connected with a high-temperature water inlet of an evaporator of a fifth heat pump and outputs high-temperature heat exchange water (60 ℃), a low-temperature water outlet of the evaporator of the fifth heat pump is divided into two branches, the first branch is connected with a first output and outputs heat exchange water (25 ℃), the second branch is connected with a high-temperature water inlet of an evaporator of a fourth heat pump and outputs heat exchange water (25 ℃), a low-temperature water outlet of the evaporator is connected with a second output and outputs low-temperature heat exchange water, a low-temperature water outlet of the evaporator is connected with a second output and outputs storage water (45 ℃), an outlet of the low-temperature heat exchange section is connected with a first water separator and outputs heat exchange water (25 ℃), and is connected with the first output pipeline to supply the first output water (60 ℃), the evaporator of the fifth heat pump exchanges heat with the condenser, is connected with the second output pipeline to supply the second output water (60 ℃), the evaporator of the fourth heat pump exchanges heat with the condenser, and is connected with the third output pipeline to supply the third output water (45 ℃).
Has the advantages that: the phase change heat storage device is started and the heat energy stored in the heat storage mode is released, 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. 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, through the lithium bromide heat pump promptly, the heat transfer is accomplished to the heat pump, 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.
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, solar water heater, 35. fifteenth control valve, 36 sixteenth control valve, 37 water storage tank, 38 lithium bromide heat pump,
39. the system comprises a fourth heat pump, 40, a fifth heat pump, 41, a user terminal pipeline, 42, a sixth circulating pump, 43, a steam-water heat exchanger, 44, a seventeenth control valve, 45, a first lithium bromide heat pump unit, 46, a second lithium bromide heat pump unit, 47, a third lithium bromide heat pump unit, 48, a steam heat pump unit, 49, a steam turbine and 50, and a steam exhaust device.
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), 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 upper hose of cooling tower (6), the outlet pipeline of cooling tower (6) lets in cold pond (21), upper hose installation two-stage control valve and circulating pump, the upper hose lets in hot pond (22), the circulating pump sets up the position department between hot pond (22) and two-stage control valve at the upper hose, the valve of two-stage control valve within a definite time by the upper hose intercommunication, and be located the upper hose intercommunication branch water pipe of this part, the branch water pipe is by the tube coupling heat pump, and be located this part's pipe-line installation 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 an outlet of a low-temperature heat exchange section 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. A first heat pump (23),
24-26 ℃ intermediate water input from the cold ends of condensers of a second heat pump (24) and a third heat pump (25) is supplied by a first water separator (28), the first water separator (28) is connected with an outlet of a low-temperature heat exchange section of a lithium bromide heat pump heating device, return water after heat exchange of the low-temperature heat exchange section of the lithium bromide heat pump serves as the 24-26 ℃ intermediate water, the intermediate water for float glass waste heat recovery is reheated by a solar waste heat recovery device, part of heat and high-temperature hot water of a power plant are subjected to heat exchange to a user pipeline in the lithium bromide heat pump heating device, the float glass waste heat and the solar waste heat serve as heating heat sources, the heat-exchanged intermediate water with relatively stable low temperature is used for cold end output of the condenser end of the heat pump unit, the heat exchange is cyclically participated, and the water quantity and the heat are saved.
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 separator (28) is connected with the high-temperature input ends of the condensers of the three groups of heat pumps of the float glass waste heat recovery device.
And the outlet of the water storage tank (37) is communicated with the inlet of the low-temperature heat exchange section of the lithium bromide heat pump (38). And a sixteenth control valve (36) is arranged on a communication pipeline between the water storage tank (37) and the low-temperature heat exchange section, 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 storage tank and is used for controlling the water quantity and the water speed of the solar waste heat recovery device for supplying water to the lithium bromide heat pump heating device. The power plant condensed gas inlet pipe (43) is connected with the power plant, the temperature of steam in the power plant condensed gas inlet pipe is about 100 ℃, and the temperature of water output from 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 inlet of the low-temperature heat exchange section of the lithium bromide heat pump (38), and the water collector 26 conveys stored water to the water storage tank 37, wherein the stored water is 45 ℃.
The lithium bromide heat pump heating device comprises a lithium bromide heat pump (38), a fourth heat pump (39) and a fifth heat pump (40); 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 medium-temperature heat exchange section is connected with a first output pipeline, the fourth heat pump (39) comprises an evaporator and a condenser, the condenser is connected with a second output pipeline, the fifth heat pump (40) comprises an evaporator and a condenser, and the condenser is connected with a third output pipeline; the inlet of the high-temperature heat exchange section is connected with the water outlet of a steam-water heat exchanger (43) of a cogeneration device of a power plant, the outlet of the high-temperature heat exchange section is connected with the high-temperature water inlet of an evaporator of a fifth heat pump (40), the low-temperature water outlet of the evaporator of the fifth heat pump (40) is divided into two branches, the first branch is connected with a first output, the second branch is connected with the high-temperature water inlet of the evaporator of a fourth heat pump (39), the low-temperature water outlet of the evaporator is connected with a second output, a water supply pipe is connected with the inlet of the low-temperature heat exchange section, and the outlet of the low-.
The first output is a medium-temperature heat source of a third lithium bromide heat pump unit (47) of the cogeneration device of the power plant, and the second output is a low-temperature inlet of a condenser of the steam heat pump unit (48). The water supply pipe is connected with the outlet of the water storage tank (37). And the water supply pipe is provided with a sixteenth control valve (36). And a sixth circulating pump (42) is arranged on a pipeline connecting the outlet of the low-temperature heat exchange section with the first water divider (28). The first output pipeline, the second output pipeline and the third output pipeline are user output pipelines and are heating pipelines.
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, accomplish the heat transfer through the lithium bromide heat pump promptly, 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, realized water source and thermal saving and make full use of. 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, a steam-water heat exchanger (43) is communicated with a high-temperature heat exchange section of a lithium bromide heat pump (38), and is used for conveying high-temperature heat exchange water (100 ℃), an outlet of the high-temperature heat exchange section is connected with a high-temperature water inlet of an evaporator of a fifth heat pump (40) and outputs the high-temperature heat exchange water (60 ℃), a low-temperature water outlet of the evaporator of the fifth heat pump (40) is divided into two branches, the first branch is connected with a first output and outputs the heat exchange water (25 ℃), the second branch is connected with a high-temperature water inlet of an evaporator of a fourth heat pump (39) and outputs the heat exchange water (25 ℃), a low-temperature water outlet of the evaporator is connected with a second output and outputs the low-temperature heat exchange water (5 ℃), a low-temperature water outlet of the evaporator is connected with a second output and outputs stored water (45 ℃), an outlet of the low-temperature heat exchange section is connected with, and outputs heat exchange intermediate water (25 ℃), the medium temperature heat exchange section exchanges heat with the high temperature heat exchange section and the low temperature heat exchange section, is connected with a first output pipeline to supply first output water (60 ℃), the evaporator of a fifth heat pump (40) exchanges heat with a condenser, is connected with a second output pipeline to supply second output water (60 ℃) and the water supply temperature of the second output pipeline is 45 ℃), the evaporator of a fourth heat pump (39) exchanges heat with the condenser, and is connected with a third output pipeline to supply third output water (45 ℃) and the water supply temperature of the third output pipeline is 36 ℃.
The first output is a low-temperature heat source of a third lithium bromide heat pump unit (47) of a cogeneration device of a power plant, heat exchange water (25 ℃) is output to the first output through a first branch, the second output is a low-temperature inlet of a condenser of a steam heat pump unit (48), and low-temperature heat exchange water (5 ℃) is output to the second output through a low-temperature water outlet of an evaporator of a fourth heat pump (39). The three-way output of the first water separator (28) is connected with the cold end of the condenser of the heat pump (23, 24, 25), and low-temperature heat exchange water (25 ℃) is supplied to the first water separator.
The lithium bromide heat pump heating device and the method realize the step energy utilization, for example, the first output pipeline, the second output pipeline and the third output pipeline are user output pipelines and heating pipelines, namely, the water inlet temperature of the first output pipeline and the third output pipeline is 45 ℃, the water outlet temperature is subjected to heat exchange to be 60 ℃, the water inlet heat exchange of the second output pipeline at 36 ℃ is subjected to 45-degree water outlet, and the step energy is output without energy loss. 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 ℃.
The device for cogeneration of heat and power in a power plant comprises a steam exhaust device (50), a steam turbine (49), a steam heat pump unit (48), a third lithium bromide heat pump unit (47), a second lithium bromide heat pump unit (46) and a first lithium bromide heat pump unit (45), wherein each lithium bromide heat pump (38) unit comprises a high-temperature heat source, a low-temperature heat source and a medium-temperature heat source, a heat exchange pipeline of the steam exhaust device (50) is parallelly communicated with an evaporator of the steam heat pump unit (48) and the low-temperature heat sources of the lithium bromide heat pump (38) units, a heat exchange pipeline of the steam turbine (49) is parallelly communicated with the high-temperature heat sources of the lithium bromide heat pump (38) units, a high-temperature water outlet of a condenser is connected with an inlet of the medium-temperature heat source of the third lithium bromide heat pump unit (47), an outlet of the third lithium bromide heat pump unit (47) is communicated with an inlet of, the outlet of the medium-temperature heat source of the second lithium bromide heat pump unit (46) is communicated with the inlet of the medium-temperature heat source of the first lithium bromide heat pump unit (45).
An inlet of the steam exhaust device (50) 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 (45), the outlet pipe is communicated with an inlet of a low-temperature heat source of the first lithium bromide heat pump unit (45), an inlet of a low-temperature heat source of the second lithium bromide heat pump unit (46) is connected into the outlet pipe in parallel, an outlet of the low-temperature heat source of the third lithium bromide heat pump unit (47) is connected into the inlet pipe in parallel; the inlet of steam turbine (49) connects the inlet tube, and its exit linkage outlet pipe, inlet tube, outlet pipe parallel arrangement, the steam outlet of inlet tube intercommunication vapour-water heat exchanger (43), the steam inlet of outlet tube intercommunication vapour-water heat exchanger (43), the entry parallel access of the high temperature heat source of first lithium bromide heat pump set (45) the outlet pipe, its export parallel access the inlet tube, the entry parallel access of the high temperature heat source of second lithium bromide heat pump set (46) the outlet pipe, its export parallel access the inlet tube, the entry parallel access of the high temperature heat source of third lithium bromide heat pump set (47) the outlet pipe, its export parallel access the inlet tube, the entry linkage outlet pipe of the evaporimeter of steam heat pump set (48), the exit linkage inlet tube of the evaporimeter of steam heat pump set (48). The outlet of the medium temperature heat source of the lithium bromide heat pump unit (45) is communicated with the water inlet of the steam-water heat exchanger (43). And a low-temperature water inlet of a condenser of the steam heat pump unit (48) is connected with a low-temperature water outlet of an evaporator of a fourth heat pump (39) of the lithium bromide heat pump heating device. And the low-temperature heat source of the third lithium bromide heat pump unit (47) is also connected with a second branch of the lithium bromide heat pump heating device. And a seventeenth control valve (44) is arranged on the first branch.
The execution method of the device comprises the following steps: a cogeneration method of a power plant comprises the 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 (48), waste steam water generated by a steam exhaust device (50) exchanges heat with the power plant water with the temperature of about 5 ℃ at an evaporator end of the steam heat pump unit (48), primary heat exchange water with the temperature of about 30 ℃ is output by a condenser end of the steam heat pump unit (48), and the primary heat exchange water enters a medium-temperature heat source of a third lithium bromide heat pump unit (47) and serves as inlet water of the medium-temperature heat source; the waste steam water generated by the waste steam device (50) enters a third lithium bromide heat pump unit (47) to be used as a low-temperature heat source, the high-temperature steam with the temperature of 100 ℃ generated by a steam turbine (49) enters the third lithium bromide heat pump unit (47) to be used as a high-temperature heat source, and the effluent water of the medium-temperature heat source of the third lithium bromide heat pump unit (47) is secondary heat exchange water with the temperature of about 50 ℃; the exhaust steam water generated by the exhaust steam device (50) enters a second lithium bromide heat pump unit (46) to be used as a low-temperature heat source, the high-temperature steam generated by the steam turbine (49) enters the second lithium bromide heat pump unit (46) to be used as a high-temperature heat source, and the effluent water of a medium-temperature heat source of the second lithium bromide heat pump unit (46) is three-stage heat exchange water at about 70 ℃; the exhaust steam water generated by the exhaust steam device (50) enters a first lithium bromide heat pump unit (45) to be used as a low-temperature heat source, the high-temperature steam generated by a steam turbine (49) enters the first lithium bromide heat pump unit (45) to be used as a high-temperature heat source, the effluent water of a medium-temperature heat source of the first lithium bromide heat pump unit (45) is four-stage heat exchange water at about 90 ℃, the four-stage heat exchange water enters a steam-water heat exchanger (43) to exchange heat with the high-temperature steam generated by the steam turbine (49), and the steam-water heat exchanger (43) outputs hot water at 100 ℃.
The power plant water with the temperature of about 5 ℃ comes from an evaporator of a fourth heat pump (39) of the lithium bromide heat pump heating device. The inlet water of the low-temperature heat source of the third lithium bromide heat pump unit (47) also comprises inlet water with the temperature of 25 ℃ from a second branch of the lithium bromide heat pump heating device.
The lithium bromide heat pump heating device and the method realize the step energy utilization, for example, the first output pipeline, the second output pipeline and the third output pipeline are user output pipelines and heating pipelines, namely, the water inlet temperature of the first output pipeline and the third output pipeline is 45 ℃, the water outlet temperature of the first output pipeline and the third output pipeline is subjected to heat exchange to 60 ℃, a fourth heat pump 39 can be used for associating the fourth heat pump with a fifth heat pump 40, and the water inlet heat exchange of the second output pipeline is 45 ℃ and the water outlet temperature of the second output pipeline is 45 ℃, namely, the step energy is output, and the energy loss is avoided. 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 ℃.
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 25 ℃ 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: the lithium bromide heat pump heating device comprises a steam-water heat exchanger 43, a lithium bromide heat pump 38, a fourth heat pump 39, a fifth heat pump 40, a user end pipeline 41, a sixth circulating pump 42 and a seventeenth control valve 44. The main working principle is as follows: high-temperature steam at about 100 ℃ is introduced into the power plant from the steam-water heat exchanger 43 to serve as a high-temperature heat source of the lithium bromide heat pump 38; the water (about 60 ℃) discharged from the high-temperature heat source water outlet end of the lithium bromide heat pump enters the heat pump 40 to exchange heat with the user end pipeline 41 to form hot water at about 60 ℃ for users to use, and the temperature of the discharged water is about 25 ℃. The intermediate water with the temperature of 44-45 ℃ and the obtained float glass waste heat enters a low-temperature heat source end of a lithium bromide heat pump 38 through a sixteenth control valve 36, the outlet water temperature is about 24-26 ℃, and the intermediate water is pressurized and sent to a water separator 28 through a sixth circulating pump 42 to complete intermediate water circulation. When the fourth heat pump 39 works, the return water temperature of the user end pipeline 41 at the end of the fourth heat pump 39 is about 45 ℃, and the outlet water temperature is about 36 ℃. The return water temperature of a user end pipeline 41 at the lithium bromide heat pump 38 end is about 60 ℃, and the outlet water temperature is about 45 ℃.
Switching control: because the price of water in the power plant is expensive, some are priced according to the water quantity, and some are priced according to the consumed heat; when the power plant is priced according to the water amount and the demand load of a user end pipeline 41 is large or the demand load of the user end pipeline 41 is overlarge, a seventeenth control valve 44 and a fourth heat pump 39 are opened, so that water at the temperature of about 25 ℃ enters the fourth heat pump 39, the temperature of outlet water is about 5 ℃, and then the outlet water is sent back to the power plant; it is possible to negotiate with the plant to optimize the system operation from an economic standpoint, with a portion of the water entering the fourth heat pump 39 and then returning to the plant, and a portion of the water returning directly to the plant.
The cogeneration part device of the power plant comprises a steam heat pump unit 48, a steam lithium bromide heat pump unit 47, a steam lithium bromide heat pump unit 46, a steam lithium bromide heat pump unit 45, a steam turbine device 49 and a steam power generation device 50. The main working principle is as follows: the water of the power plant with the temperature of about 5 ℃ collected by the water end of each part enters the steam heat pump unit 48, the water with the temperature of 5 ℃ exchanges heat with the exhaust steam generated by the steam power generation device 50 in the steam heat pump unit 48 to increase the water temperature to about 30 ℃, and the water with the temperature of about 30 ℃ enters the medium temperature heat source end of the next-stage steam lithium bromide heat pump unit 47. The steam lithium bromide heat pump unit 47 obtains water at about 30 ℃ provided by the upper steam heat pump unit 48 and power plant water at about 25 ℃ collected from each position as a medium temperature heat source, high-temperature steam generated by the steam turbine device 49 is used as a high temperature heat source, and the obtained water at about 50 ℃ enters the next-stage steam lithium bromide heat pump unit 46 as a medium temperature heat source. The steam lithium bromide heat pump unit 46 obtains water at about 50 ℃ provided by the upper steam lithium bromide heat pump unit 47 as a heat source medium temperature, high-temperature steam generated by the steam turbine device 49 is used as a high-temperature heat source, and the obtained water at about 70 ℃ enters the next-stage steam lithium bromide heat pump unit 45 as a medium-temperature heat source. The steam lithium bromide heat pump unit 45 obtains water at about 70 ℃ provided by the upper steam lithium bromide heat pump unit 46 as a medium temperature heat source, high temperature steam generated by the steam turbine unit 49 as a high temperature heat source, high temperature steam at about 90 ℃ is obtained, and the high temperature steam at about 90 ℃ is sent to the steam-water heat exchanger 43. The high temperature steam generated by the steam power plant 52 heats the power plant water at about 90 ℃ to 100 ℃ at the steam-water heat exchanger 43 for use by each water end.
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 of the float glass waste heat provides a large amount of low-temperature heat sources. Greatly reduces the water consumption of the power plant and improves the economic benefit. The water of power plant and the intermediate water obtained from float glass waste heat recovery are not mixed, the water of power plant is clean, the intermediate water may contain impurities due to overlong pipeline, the water of power plant may be polluted, and the reliability of the system is ensured by the pipeline design mode without mixing water. 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 heat pump is utilized to enlarge the temperature difference, the space is saved, and the heat pump is suitable for small machine rooms. The problem of mismatching of heat supply and demand caused by severe cold weather or water shortage and low load operation during maintenance of a float glass plant can be solved, the heat demand of a user side when the load is normal can be met, the step 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.
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 lithium bromide heat pump heating method for recovering solar energy waste heat is characterized by comprising a solar energy waste heat recovery method and a lithium bromide heat pump heating method;
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; circulating the water storage 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 inlet of the low-temperature heat exchange section of the lithium bromide heat pump (38), and the water collector (26) conveys the stored water to the water storage tank (37);
the lithium bromide heat pump heating method comprises the steps that a steam-water heat exchanger (43) is communicated with a high-temperature heat exchange section of a lithium bromide heat pump (38) and is used for conveying high-temperature heat exchange water, an outlet of the high-temperature heat exchange section is connected with a high-temperature water inlet of an evaporator of a fifth heat pump (40) and is used for outputting the high-temperature heat exchange water, a low-temperature water outlet of the evaporator of the fifth heat pump (40) is divided into two branches, the first branch is connected with a first output and is used for outputting the heat exchange water, the second branch is connected with a high-temperature water inlet of an evaporator of a fourth heat pump (39) and is used for outputting the heat exchange water, a low-temperature water outlet of the evaporator is connected with a second output and is used for outputting the low-temperature heat exchange water (5 ℃), a low-temperature water outlet of the evaporator is connected with a second output and is used for storing water, an outlet of the low-temperature heat exchange section is connected with a first water separator (28, and is connected with the first output pipeline to supply first output water, the evaporator of the fifth heat pump (40) exchanges heat with the condenser, is connected with the second output pipeline to supply second output water, and the evaporator of the fourth heat pump (39) exchanges heat with the condenser, and is connected with the third output pipeline to supply third output water.
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| CN112856550A (en) * | 2021-01-08 | 2021-05-28 | 大连民族大学 | Multi-heat-pump heat-increasing heating system based on waste heat recovery and waste heat recovery heating power generation system |
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Application publication date: 20200630 |