CN111351258A - Method for supplying circulating intermediate water by combining heat mixing type heat pump and waste heat recovery float glass - Google Patents

Method for supplying circulating intermediate water by combining heat mixing type heat pump and waste heat recovery float glass Download PDF

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Publication number
CN111351258A
CN111351258A CN201811566055.3A CN201811566055A CN111351258A CN 111351258 A CN111351258 A CN 111351258A CN 201811566055 A CN201811566055 A CN 201811566055A CN 111351258 A CN111351258 A CN 111351258A
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water
heat
temperature
control valve
heat exchange
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汪语哲
杨正凯
张皓天
李佳乐
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Dalian Minzu University
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Dalian Minzu University
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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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/18—Hot-water central heating systems using heat pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B27/00—Machines, plants or systems, using particular sources of energy
    • F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
    • 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
    • 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
    • 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
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/32—Heat sources or energy sources involving multiple heat sources in combination or as alternative heat sources
    • 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
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/10—Heat storage materials, e.g. phase change materials or static water enclosed in a space
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
    • Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
    • 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

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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)
  • Sorption Type Refrigeration Machines (AREA)

Abstract

A method for jointly supplying circulating intermediate water to a mixed heat type heat pump and waste heat recovery float glass belongs to the field of heat supply waste heat recovery and heat distribution, and aims to solve the problems that part of heat and high-temperature hot water of a power plant are subjected to heat exchange for a user pipeline in a lithium bromide heat pump heating device, the intermediate water with relatively stable low temperature after heat exchange is used for cold end output of a condenser end of a heat pump unit, an outlet of a low-temperature heat exchange section is connected with an inlet of a water separator and outputs low-temperature heat exchange water (25 ℃) to the outlet of the water separator, the low-temperature heat exchange water is output from a first outlet and a second outlet of the water separator, the effect is that the part of heat and the high-temperature hot water of the power plant are subjected to heat exchange for the user pipeline in the lithium bromide heat pump heating device, the intermediate water with relatively stable low temperature after heat exchange is used for cold.

Description

Method for supplying circulating intermediate water by combining heat mixing type heat pump and waste heat recovery float glass
Technical Field
The invention belongs to the field of heat supply waste heat recovery and heat distribution, and relates to a method for jointly supplying circulating intermediate water by a mixed heat type heat pump and waste heat recovery float glass.
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 the lithium bromide heat pump heating device exchanges heat of the part of heat and high-temperature hot water of a power plant to a user pipeline together, and intermediate water with relatively stable low temperature after heat exchange is used for outputting at the cold end of a condenser end of a heat pump unit, the invention provides the following technical scheme:
a method for supplying circulating intermediate water by combining a mixed heat type heat pump and waste heat recovery float glass comprises
A lithium bromide heat pump heating method and a float glass waste heat recovery method;
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 an inlet of a high-temperature heat exchange water pipe of a plate heat exchanger and outputs the high-temperature heat exchange water (70 ℃), an outlet of the high-temperature heat exchange water pipe of the plate heat exchanger is connected with a first inlet of a water mixer and outputs heat exchange cold water (50 ℃), a water supply pipe is connected with a second inlet of the water mixer and outputs storage water (45 ℃), the heat exchange cold water and the storage water are mixed in the water mixer to form mixed water (46 ℃), an outlet of the water mixer is connected with an inlet of a low-temperature heat exchange section and outputs the mixed water, an outlet of the low-temperature heat exchange section is connected with an inlet of a water separator and outputs low-temperature heat exchange water (25 ℃), the first outlet is branched into two branches, the first branch of the first outlet is connected with a high-temperature water inlet of an evaporator of the fourth heat pump and outputs low-temperature heat exchange water to the high-temperature water inlet, the low-temperature water is output from a low-temperature water outlet of the evaporator of the fourth heat pump, a second outlet of the water separator is connected with the first water separator and outputs low-temperature heat exchange water (25 ℃) to the first water separator, the medium-temperature heat exchange section exchanges heat with the high-temperature heat exchange section and the low-temperature heat exchange section and is connected with a first output pipeline to supply first output water (60 ℃), the high-temperature heat exchange water exchanges heat with the low-temperature heat exchange water pipe and is connected with a second output pipeline to supply second output water (55 ℃), the evaporator exchanges heat with the condenser and is connected with a third output pipeline;
the method for recycling the waste heat of the float glass comprises the steps of introducing circulating water at 37-39 ℃ generated in a float glass workshop into a hot pool through a first water pipe, pressurizing a second circulating pump and a third circulating pump, opening an eighth control valve, a ninth control valve, a tenth control valve and an eleventh control valve after pressurization, closing the third control valve, the fourth control valve, the fifth control valve and the sixth control valve, opening a seventh control valve, pumping the circulating water at 37-39 ℃ in the hot pool through the circulating pump of a water feeding pipe, pumping the circulating water to evaporators in a first heat pump, a second heat pump and a third heat pump, inputting the circulating water as the hot end of the evaporators, exchanging heat between the circulating water at 37-39 ℃ and intermediate water at 24-26 ℃ at the cold end of a condenser, outputting the intermediate water at 33-35 ℃ at the hot end of the condenser after heat exchange, outputting the circulating water at 31-33 ℃ at the cold end of the evaporators, supplying the circulating water to a cooling tower, cooling the circulating water by the cooling tower and discharging the circulating water into a cold pool, the circulating water in the cold pool is pressurized by a first circulating pump, a second control valve is opened, the circulating water in the cold pool is conveyed to a float glass workshop to be used as cooling water for producing float glass, when heat exchange is not needed, an eighth control valve, a ninth control valve, a tenth control valve, an eleventh control valve, a third control valve, a fourth control valve, a fifth control valve and a sixth control valve are opened, a seventh control valve is closed, the circulating water at 37-39 ℃ in the hot pool is extracted by the circulating pump of the water supply pipe and is directly extracted to a cooling tower to be cooled, 24-26 ℃ intermediate water input from the cold ends of condensers of the first heat pump, the second heat pump and the third heat pump is supplied by a first water separator, the first water separator is connected with a second outlet of a second water separator of the lithium bromide heat pump device, and the backwater after heat exchange of the lithium bromide heat pump is used as the 24-26 ℃ intermediate water for heating.
Has the advantages that: the backwater after the heat exchange of the lithium bromide heat pump is used as intermediate water, the heat of the part of heat and the high-temperature hot water of the power plant are exchanged for the user pipeline in the lithium bromide heat pump heating device, the intermediate water with relatively stable low temperature after the heat exchange is used for the output of the cold end of the condenser end of the heat pump unit, the heat exchange is participated in circulation, and the water quantity and the heat are saved. The step energy utilization is realized, if the first output pipeline, the second output pipeline and the third output pipeline are user output pipelines and are heating pipelines, the lithium bromide heat pump and the plate heat exchanger are in bidirectional association, and the lithium bromide heat pump and the fourth heat pump are associated, so that the device can output preset step energy conveniently due to the association among the heating devices, and the energy loss is greatly reduced.
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 plate heat exchangers, 41 user end pipelines, 42 steam-water heat exchangers, 43 water mixers, 44 seventeenth control valves, 45 water distribution valves, 46 second water dividers, 47 sixth circulating pumps, 48 steam heat pump units, 49 first lithium bromide heat pump units, 50 second lithium bromide heat pump units, 51 third lithium bromide heat pump units, 52 steam turbines and 53 steam exhaust devices.
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 a second outlet of a second water divider (46) 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 with the temperature of 24-26 ℃ input from 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 divider (28), the first water divider (28) is connected with a second outlet of a second water divider (46) of the lithium bromide heat pump heating device, the return water after heat exchange of the lithium bromide heat pump is used as the intermediate water with the temperature of 24-26 ℃ to form the intermediate water for float glass waste heat recovery, the intermediate water is reheated by a solar waste heat recovery device, the partial heat and the high-temperature hot water of a power plant are subjected to heat exchange together for a user pipeline in the lithium bromide heat pump heating device, the float glass waste heat and the solar waste heat are used as heating heat sources, the intermediate water with relatively stable low temperature after heat exchange is used for the cold end output of the condenser of the heat pump unit, the intermediate water circularly participates in heat exchange, and the 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 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 (33), 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 (34) 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 (34) 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.
And the outlet of the water storage tank (37) is communicated with a second inlet of the lithium bromide heat pump unit, which is connected with a water mixer (43). And a sixteenth control valve (36) is arranged on a communication pipeline between the water storage tank (37) and the water mixer, 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 power plant condensed gas inlet pipe (41) 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 (34), opening a thirteenth control valve (32), so that water in the 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 (33), 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 (34), 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 (33), 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 evaporation 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 (34), 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 (33), 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 evaporation 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 second inlet of the water mixer (43), 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), a plate heat exchanger (40), a water mixer (43) and a second water separator (46); 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 plate type heat exchanger (40) comprises a high-temperature heat exchange water pipe and a low-temperature heat exchange water pipe, the low-temperature heat exchange water pipe is connected with a second output pipeline, the heat pump 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 a water outlet of a steam-water heat exchanger (42) of a cogeneration device of a power plant, the outlet of the high-temperature heat exchange section is connected with the inlet of a high-temperature heat exchange water pipe of the plate heat exchanger (40), the outlet of the high-temperature heat exchange water pipe of the plate heat exchanger (40) is connected with a first inlet of a water mixer (43), a water supply pipe is connected with a second inlet of the water mixer (43), the outlet of the water mixer (43) 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 inlet of the water divider, the first outlet of the second water divider (46) is divided into two branches, the first branch of the first outlet is connected with a high-temperature water inlet of an evaporator of the fourth heat pump (39), and.
The water supply pipe is connected with an outlet of the water storage tank (37), a low-temperature water outlet of an evaporator of the fourth heat pump (39) is connected with a low-temperature inlet of a condenser of a steam heat pump unit (48) of the cogeneration device of the power plant, and a second branch of the first outlet is connected with a medium-temperature heat source of a first lithium bromide heat pump unit (49) of the cogeneration device of the power plant. And the water supply pipe is provided with a sixteenth control valve (36). And a sixth circulating pump (47) is arranged on a pipeline connecting the second outlet of the second water separator (46) with the first water separator (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 is characterized in that a steam-water heat exchanger (42) 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 connected with an inlet of a high-temperature heat exchange water pipe of a plate type heat exchanger (40), the high-temperature heat exchange water (70 ℃) is output to the high-temperature heat exchange water pipe, an outlet of the high-temperature heat exchange water pipe of the plate type heat exchanger (40) is connected with a first inlet of a water mixer (43), heat exchange cold water (50 ℃) is output to the high-temperature heat exchange water pipe, a water supply pipe is connected with a second inlet of the water mixer (43), storage water (45 ℃) is output to the water pipe, the heat exchange cold water and the storage water are mixed in the water mixer (43) to form mixed water (46 ℃), an outlet of the water mixer (43) is connected with an inlet of, the low-temperature heat exchange water is output from a first outlet and a second outlet of the water separator, the first outlet is branched into two branches, the first branch of the first outlet is connected with a high-temperature water inlet of an evaporator of a fourth heat pump (39) and outputs the low-temperature heat exchange water, the low-temperature water outlet of the evaporator of the fourth heat pump (39) outputs low-temperature water (5 ℃), the second outlet of the water separator is connected with a first water separator (28) and outputs the low-temperature heat exchange water (25 ℃), the medium-temperature heat exchange section exchanges heat with the high-temperature heat exchange section and the low-temperature heat exchange section and is connected with a first output pipeline to supply the first output water (60 ℃), the high-temperature heat exchange water pipe exchanges heat with the low-temperature heat exchange water pipe and is connected with a second output pipeline to supply the second output water (55 ℃), the evaporator exchanges heat with the condenser and is connected with a third output pipeline to.
A low-temperature water outlet of an evaporator of the fourth heat pump (39) is connected with a low-temperature inlet of a condenser of the steam heat pump unit (48) and supplies low-temperature water (5 ℃) to the condenser of the steam heat pump unit (48), a second branch of the first outlet is connected with a medium-temperature heat source of the first lithium bromide heat pump unit (49) and supplies medium-temperature heat-exchange water (25 ℃) to the medium-temperature heat source of the first lithium bromide heat pump unit (49). The three outputs of the water separator 28 are connected to the cold end of the condenser of the heat pump (23, 24, 25), and low-temperature heat exchange water (25 ℃) is supplied to the condenser.
The device for cogeneration of heat and power in a power plant comprises a steam exhaust device (53), a steam turbine (52), a steam heat pump unit (48), a first lithium bromide heat pump unit (49), a second lithium bromide heat pump unit (50) and a third lithium bromide heat pump unit (51), wherein each lithium bromide heat pump 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 (53) 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 units, a heat exchange pipeline of the steam turbine (52) is parallelly communicated with the high-temperature heat sources of the lithium bromide heat pump units, a high-temperature water outlet of a condenser is connected with an inlet of the medium-temperature heat source of the first lithium bromide heat pump unit (49) for communication, an outlet of the first lithium bromide heat pump unit (49) is, the outlet of the medium-temperature heat source of the second lithium bromide heat pump unit (50) is communicated with the inlet of the medium-temperature heat source of the third lithium bromide heat pump unit (51).
An inlet of the steam exhaust device (53) 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 third lithium bromide heat pump unit (51), the outlet pipe is communicated with an inlet of a low-temperature heat source of the third lithium bromide heat pump unit (51), an inlet of a low-temperature heat source of the second lithium bromide heat pump unit (50) is connected into the outlet pipe in parallel, an outlet of the low-temperature heat source of the first lithium bromide heat pump unit (49) is connected into the inlet pipe in parallel, an outlet of the low-temperature heat source of the first lithium bromide heat pump unit (49) is connected into the outlet pipe in parallel;
the inlet of the steam turbine (52) is connected with the inlet pipe, the outlet of the steam turbine is connected with the 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 (42), the outlet pipe is communicated with the steam inlet of the steam-water heat exchanger (42), the inlet of the high-temperature heat source of the third lithium bromide heat pump unit (51) is connected into the outlet pipe in parallel, the outlet of the high-temperature heat source of the second lithium bromide heat pump unit (50) is connected into the inlet pipe in parallel, the outlet of the high-temperature heat source of the first lithium bromide heat pump unit (49) is connected into the outlet pipe in parallel, the outlet of the high-temperature heat source of the second lithium bromide heat pump unit is connected into the inlet pipe in parallel, the inlet of the evaporator of the steam heat.
The outlet of the medium-temperature heat source of the third lithium bromide heat pump unit (51) is communicated with the water inlet of the steam-water heat exchanger (42). 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 first lithium bromide heat pump unit (49) is also connected with a second branch of a first outlet of a water separator 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 (53) 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 first lithium bromide heat pump unit (49) and serves as inlet water of the medium-temperature heat source; the waste steam water generated by the waste steam device (53) enters a first lithium bromide heat pump unit (49) to be used as a low-temperature heat source, the high-temperature steam with the temperature of 100 ℃ generated by a steam turbine (52) enters the first lithium bromide heat pump unit (49) to be used as a high-temperature heat source, and the effluent water of the medium-temperature heat source of the first lithium bromide heat pump unit (49) is secondary heat exchange water with the temperature of about 50 ℃; the exhaust steam water generated by the exhaust steam device (53) enters a second lithium bromide heat pump unit (50) to be used as a low-temperature heat source, the high-temperature steam generated by the steam turbine (52) enters the second lithium bromide heat pump unit (50) 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 (50) is three-stage heat exchange water at about 70 ℃; the exhaust steam water generated by the exhaust steam device (53) enters a third lithium bromide heat pump unit (51) to be used as a low-temperature heat source, the high-temperature steam generated by the steam turbine (52) enters the third lithium bromide heat pump unit (51) 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 (51) is four-stage heat exchange water at about 90 ℃, the four-stage heat exchange water enters a steam-water heat exchanger (42) to exchange heat with the high-temperature steam generated by the steam turbine (52), and the steam-water heat exchanger (42) 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 medium-temperature heat source of the first lithium bromide heat pump unit (49) also comprises inlet water at 25 ℃ from a second branch of a first outlet of a water separator of the lithium bromide heat pump heating device.
The lithium bromide heat pump heating device and the method realize the utilization of the step energy, for example, the first output pipeline, the second output pipeline and the third output pipeline are user output pipelines and are heating pipelines, namely the water inlet temperature of the first output pipeline is 45 ℃, the water outlet temperature of the first output pipeline is 60 ℃ after heat exchange, the lithium bromide heat pump 38 is in two-way association with the plate heat exchanger 40, the water inlet temperature of the second output pipeline is 36 ℃, the water outlet temperature of the second output pipeline is 55 ℃ after heat exchange, the lithium bromide heat pump 38 is associated with the fourth heat pump 39, the water inlet temperature of the third output pipeline is 36 ℃, the water outlet temperature of the third output pipeline is 45 ℃ after heat exchange, the association among the heating devices ensures that the device is convenient to output the preset step energy without energy loss, 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, the heat exchange means ensures that the low-quality heat can, the energy is used more aggressively, and the energy is also used in a step mode. 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 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 is opened, and the water is sent to the water mixer 43 to be mixed.
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 32 is closed, the control valve 34 is opened, and the device does not need to open the phase change heat storage device 31 to directly heat the water in the water tank 37.
2. Mode of energy storage
When the solar radiation intensity is too high, the control valve 34 is closed, the control valve 32 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 period of time, the fourteenth control valve 34 is closed and the thirteenth control valve 32 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 42, a lithium bromide heat pump 38, a heat pump 39, a plate heat exchanger 40, a user end pipeline 41, a circulating pump 47 and a 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 42 to serve as a high temperature heat source of the lithium bromide heat pump 38; the water (about 70 ℃) discharged from the high-temperature heat source water outlet end of the lithium bromide heat pump enters the plate heat exchanger 40 to exchange heat with the user end pipeline 41 to obtain hot water with the temperature of about 55 ℃ 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 control valve 36, the outlet water temperature is about 24-26 ℃, and the intermediate water is pressurized by a circulating pump 42 and sent to a water separator 28 to complete intermediate water circulation. When the heat pump 39 works, the return water temperature of a user end pipeline 41 at the end of the 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 ℃.
The invention is characterized by the following switching control: because the price of water in the power plant is expensive, some of the water is priced according to the water quantity, and some of the water is 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 control valve 44 and a heat pump 39 are opened, so that water at about 25 ℃ enters the 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 have a portion of the water entering the heat pump 39 and returning to the plant from the economy and optimization system, and a portion of the water returning directly to the plant.
High temperature steam at about 100 ℃ is introduced into the power plant from the steam-water heat exchanger 42 to serve as a high temperature heat source of the lithium bromide heat pump 38; the water outlet temperature of the water outlet end of the high-temperature heat source of the lithium bromide heat pump is about 70 ℃, the water enters the plate heat exchanger 40 to exchange heat with a plate heat exchanger of about 36 ℃ of the user end pipeline 41, hot water of about 55 ℃ is obtained to be used by a fan coil of the user end, and the water outlet temperature is about 50 ℃. The effluent is sent to a water mixer 43 to be mixed with the intermediate water which is heated by the solar water heater and contains the float glass low-temperature waste heat at 45 ℃, and the water temperature is about 46 ℃ after the water mixing. The mixed water is sent to a lithium bromide heat pump 38 to be used as a low-temperature heat source, the outlet water temperature is about 25 ℃, and the outlet water is sent to a water separator 46. The water from the water separator 46 is returned to the power plant in an amount equal to the amount of water introduced by the steam-water heat exchanger 42, and the remaining water from the water separator 46 is pressurized and sent to the water separator 28 to complete the intermediate water cycle. When the heat pump 39 works, the control valve 44 is opened, water with the temperature of 25 ℃ is introduced into the heat pump 39 to be used as a heat source to exchange heat with a user side of the heat pump 39, the return water temperature is about 5 ℃, and the water is directly introduced into the steam heat pump unit 48 to exchange heat. When the heat pump 39 does not work, the control valve 44 is closed, and water at 25 ℃ which is supplied to the power plant is separated by the water separator 46 and is directly introduced into the lithium bromide heat pump unit 49. The outlet water temperature of a user end pipeline 41 at the heat pump end 39 is about 36 ℃, and the return water temperature is about 45 ℃. The return water temperature of a user end pipeline at the lithium bromide heat pump end is about 60 ℃, and the outlet water temperature is about 45 ℃.
The cogeneration part device of the power plant comprises a steam heat pump unit 48, a steam lithium bromide heat pump unit 49, a steam lithium bromide heat pump unit 50, a steam lithium bromide heat pump unit 51, a steam turbine device 52 and a steam power generation device 53. The main working principle is as follows: when the heat pump 39 works, the control valve 44 is opened, the power plant water with the temperature of about 5 ℃ obtained after heat reduction by the heat pump 39 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 53 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 49. The steam lithium bromide heat pump unit 49 obtains water of about 30 ℃ provided by the upper steam heat pump unit 48 and power plant water of about 25 ℃ distributed to the lithium bromide heat pump unit 49 by the water distributor 46 when the heat pump 39 does not work as medium temperature heat sources, high temperature steam generated by the steam turbine device 52 is used as a high temperature heat source, and the obtained water of about 50 ℃ enters the next stage of steam lithium bromide heat pump unit 50 to be used as the medium temperature heat source. The steam lithium bromide heat pump unit 50 obtains water at about 50 ℃ provided by the upper steam lithium bromide heat pump unit 49 as a medium temperature heat source, high temperature steam generated by the steam turbine device 52 as a high temperature heat source, and the obtained water at about 70 ℃ enters the next stage of steam lithium bromide heat pump unit 51 as a medium temperature heat source. The lithium bromide vapor heat pump unit 51 obtains water at about 70 ℃ provided by the upper lithium bromide vapor heat pump unit 50 as a medium temperature heat source, high temperature steam generated by the steam turbine unit 52 as a high temperature heat source to obtain water at about 90 ℃, and high temperature steam at about 100 ℃ generated by the steam turbine unit 52 is sent to the steam-water heat exchanger 42. The high temperature steam heats the power plant water at about 90 ℃ to 100 ℃ at the steam-water heat exchanger 42 and is used as a high temperature heat source for the lithium bromide heat pump 38. 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 ℃.
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 power plant water and the intermediate water obtained from float glass waste heat recovery are not mixed, the power plant water is clean, the intermediate water possibly contains impurities due to overlong obtained pipe, the power plant water is possibly polluted, and the reliability of the system is ensured by a pipeline design mode without water mixing. 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 method for supplying circulating intermediate water by combining a mixed heat type heat pump and waste heat recovery float glass comprises
A lithium bromide heat pump heating method and a float glass waste heat recovery method;
the lithium bromide heat pump heating method comprises the steps that a steam-water heat exchanger (42) 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 an inlet of a high-temperature heat exchange water pipe of a plate type heat exchanger (40) and outputs the high-temperature heat exchange water, an outlet of the high-temperature heat exchange water pipe of the plate type heat exchanger (40) is connected with a first inlet of a water mixer (43) and outputs heat exchange cold water, a water supply pipe is connected with a second inlet of the water mixer (43) and outputs storage water, the heat exchange cold water and the storage water are mixed in the water mixer (43) to form mixed water, an outlet of the water mixer (43) is connected with an inlet of a low-temperature heat exchange section and outputs the mixed water, an outlet of the low-temperature heat exchange water is connected with an inlet of a water separator and outputs the low-temperature heat exchange water, and the, the first outlet is branched into two branches, the first branch of the first outlet is connected with a high-temperature water inlet of an evaporator of a fourth heat pump (39) and outputs low-temperature heat exchange water, low-temperature water (5 ℃) is output from a low-temperature water outlet of the evaporator of the fourth heat pump (39), a second outlet of the water separator is connected with a first water separator (28) and outputs low-temperature heat exchange water, a medium-temperature heat exchange section exchanges heat with a high-temperature heat exchange section and a low-temperature heat exchange section and is connected with a first output pipeline to supply first output water, a high-temperature heat exchange water pipe exchanges heat with a low-temperature heat exchange water pipe and is connected with a second output pipeline to supply second output water, the evaporator exchanges heat with a condenser and is connected with a third output pipeline to supply third output water;
the 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 is supplied to a cooling tower (6), the circulating water is cooled by the cooling tower (6) and then is discharged into a cold pool (21), 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, 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) are opened, a seventh control valve (11) is closed, the circulating water with the temperature of 37-39 ℃ in a hot pool (22) is extracted by a circulating pump of a water feeding pipe and is directly extracted to the cooling tower (6) to be cooled, the medium water with the temperature of 24-26 ℃ input from 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 divider (28), the first water divider (28) is connected with the second outlet of a second water divider (46) of the lithium bromide heat pump heating device, and the return water after heat exchange of the lithium bromide heat pump is used as the medium water with the temperature of 24-26 ℃.
CN201811566055.3A 2018-12-20 2018-12-20 Method for supplying circulating intermediate water by combining heat mixing type heat pump and waste heat recovery float glass Withdrawn CN111351258A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008008581A (en) * 2006-06-30 2008-01-17 Toho Gas Co Ltd Absorption type space heating/hot water supply device
CN202532587U (en) * 2012-04-27 2012-11-14 北京华茂环能科技有限公司 System for recycling condensation heat from power plant for building heating by using heat pump
CN204301176U (en) * 2014-09-23 2015-04-29 大连葆光节能空调设备厂 Reduce the energy-saving heating system of heat supply return water temperature and recovery city used heat
CN106610044A (en) * 2016-12-29 2017-05-03 大连葆光节能空调设备厂 System for enlarging cogeneration centralized heat supply scale
CN107062698A (en) * 2016-12-27 2017-08-18 大连葆光节能空调设备厂 A kind of efficient direct expanding solar heating pump couples heating system with water resource heat pump
CN108105831A (en) * 2017-12-04 2018-06-01 大连葆光节能空调设备厂 A kind of glass factory's low temperature exhaust heat recycling system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008008581A (en) * 2006-06-30 2008-01-17 Toho Gas Co Ltd Absorption type space heating/hot water supply device
CN202532587U (en) * 2012-04-27 2012-11-14 北京华茂环能科技有限公司 System for recycling condensation heat from power plant for building heating by using heat pump
CN204301176U (en) * 2014-09-23 2015-04-29 大连葆光节能空调设备厂 Reduce the energy-saving heating system of heat supply return water temperature and recovery city used heat
CN107062698A (en) * 2016-12-27 2017-08-18 大连葆光节能空调设备厂 A kind of efficient direct expanding solar heating pump couples heating system with water resource heat pump
CN106610044A (en) * 2016-12-29 2017-05-03 大连葆光节能空调设备厂 System for enlarging cogeneration centralized heat supply scale
CN108105831A (en) * 2017-12-04 2018-06-01 大连葆光节能空调设备厂 A kind of glass factory's low temperature exhaust heat recycling system

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