CN111219906A - A combined energy supply system of a regional distributed energy system and a lake water source heat pump - Google Patents
A combined energy supply system of a regional distributed energy system and a lake water source heat pump Download PDFInfo
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- CN111219906A CN111219906A CN202010137000.1A CN202010137000A CN111219906A CN 111219906 A CN111219906 A CN 111219906A CN 202010137000 A CN202010137000 A CN 202010137000A CN 111219906 A CN111219906 A CN 111219906A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 463
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims abstract description 116
- 238000010521 absorption reaction Methods 0.000 claims abstract description 55
- 239000002918 waste heat Substances 0.000 claims abstract description 55
- 238000001816 cooling Methods 0.000 claims abstract description 51
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- 238000005338 heat storage Methods 0.000 claims description 21
- 239000007789 gas Substances 0.000 claims description 16
- 239000012530 fluid Substances 0.000 claims description 9
- 239000000498 cooling water Substances 0.000 claims description 4
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- 238000005265 energy consumption Methods 0.000 description 8
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- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 5
- 239000003345 natural gas Substances 0.000 description 5
- 239000003507 refrigerant Substances 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 4
- 238000004378 air conditioning Methods 0.000 description 4
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Classifications
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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
- 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
- F25B30/06—Heat pumps characterised by the source of low potential heat
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
- F25D3/02—Devices using other cold materials; Devices using cold-storage bodies using ice, e.g. ice-boxes
-
- 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
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
- F28D20/021—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat the latent heat storage material and the heat-exchanging means being enclosed in one container
-
- 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
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/12—Hot water central heating systems using heat pumps
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Materials Engineering (AREA)
- Sorption Type Refrigeration Machines (AREA)
Abstract
本发明涉及暖通领域，具体涉及一种区域分布式能源系统与湖水源热泵复合的供能系统，包括内燃机组、溴化锂吸收式制冷机组、湖水源热泵机组和建筑供冷设备；内燃机组用于发电为用电终端供电；溴化锂吸收式制冷机组用于利用内燃机组的余热制取冷水；湖水源热泵机组用于将建筑供冷设备回水制冷后提供给建筑供冷设备。本申请通过溴化锂吸收式制冷机组吸收内燃机组发电过程中产生热能制冷为建筑提供冷源，实现了能源的再利用，在冷源不能满足建筑需求时，湖水源热泵机组利用地表内湖水，通过湖水源热泵机组实现热交换，从而实现能源的再生利用。最后通过内燃机组发的电对建筑供冷设备提供电能，节约了电能的消耗。
The invention relates to the field of HVAC, in particular to a combined energy supply system of a regional distributed energy system and a lake water source heat pump, comprising an internal combustion engine unit, a lithium bromide absorption refrigeration unit, a lake water source heat pump unit and building cooling equipment; the internal combustion engine unit is used for The power generation is used to supply power to the electricity terminal; the lithium bromide absorption refrigeration unit is used to use the waste heat of the internal combustion engine unit to produce cold water; the lake water source heat pump unit is used to cool the building cooling equipment and then supply it to the building cooling equipment. In this application, the lithium bromide absorption refrigeration unit absorbs the heat energy generated during the power generation process of the internal combustion engine unit to provide a cold source for the building, thereby realizing the reuse of energy. The water source heat pump unit realizes heat exchange, thereby realizing the regeneration and utilization of energy. Finally, the electricity generated by the internal combustion engine unit provides electricity to the building cooling equipment, which saves the consumption of electricity.
Description
Technical Field
The invention relates to the field of heating ventilation, in particular to an energy supply system combining a regional distributed energy system and a lake water source heat pump.
Background
With the rapid development of market economy in recent years, the urbanization process is rapidly developed, the urban construction scale is continuously enlarged, various industrial parks, large-scale building groups and small towns are continuously emerged, and the total building area is increased year by year. Meanwhile, along with the improvement of living standard and comfort of people, the energy consumption of unit building area is in the trend of rigid rise. Building energy consumption is the energy consumption necessary to serve building functions and building comfort.
Due to the continuously increasing demand and the adjustment of urban energy structures, energy supply situations tend to be tense nationwide, and the energy supply cannot meet the requirements of sustainable development of economy and environment. The power load is increased year by year, especially the peak power shortage and peak valley difference are increased in summer, and many cities have to switch off and limit power in summer; natural gas shortage and price improvement appear in a plurality of cities in China, and energy sources become bottlenecks which restrict further development of economy.
The air conditioner and the heating load which have the highest proportion in building energy consumption and the largest energy-saving potential meet the cooling and heating comfort requirements of the building. In the prior art, a large amount of electric energy is consumed by building air conditioners, hot water systems and other systems, the electric energy consumption is high, the energy efficiency ratio is low, and the environmental protection and energy conservation are not enough.
Disclosure of Invention
The invention provides an energy supply system combining a regional distributed energy system and a lake water source heat pump, aiming at the problem that the current building consumes more electric energy for cooling.
In order to achieve the above purpose, the invention provides the following technical scheme:
an energy supply system combining a regional distributed energy system and a lake water source heat pump,
the system comprises an internal combustion engine set, a lithium bromide absorption refrigerating unit, a lake water source heat pump unit and building cold supply equipment; the internal combustion engine set is used for generating power to supply power to the power utilization terminal; the lithium bromide absorption type refrigerating unit is used for absorbing waste heat of the internal combustion engine unit, supplying the waste heat to the building cooling equipment after cooling; the lake water source heat pump unit is used for refrigerating return water of the building cooling equipment and then supplying the return water to the building cooling equipment;
the heating smoke inlet of the lithium bromide absorption refrigerating unit is connected with the heating smoke outlet of the internal combustion engine unit, the cold water outlet of the lithium bromide absorption refrigerating unit is connected with the cold water inlet of the building cooling equipment, the return water of the building cooling equipment flows out and then is divided into two branches, one branch flows into the return water inlet of the lithium bromide absorption refrigerating unit, the other branch flows into the return water inlet of the lake water source heat pump unit, and the cold water outlet of the lake water source heat pump unit is communicated with the cold water inlet of the building cooling equipment after being combined with the cold water outlet of the lithium bromide absorption refrigerating unit.
Preferably, the energy supply system further comprises a dual-working-condition water chilling unit and an ice storage device, wherein the dual-working-condition water chilling unit is used for refrigerating return water of the building cooling equipment and then providing a cold source for the building cooling equipment; the dual-working-condition water chilling unit is also used for preparing fluid ice and storing the fluid ice in the ice cold storage device; the ice cold storage device is used for storing fluid ice and releasing the cold energy of the fluid ice to provide a cold source for the building cold supply equipment; the water return inlet of the double-working-condition water chilling unit is communicated with the water return outlet of the building cooling equipment, the cold water outlet of the double-working-condition water chilling unit is divided into two branches, one branch is connected with the cold water inlet of the building cooling equipment, the other branch is connected with the cold water inlet of the ice storage device, the cold water outlet of the ice storage device is communicated with the cold water inlet of the building cooling equipment, and the water return outlet of the ice storage device is communicated with the water return inlet of the double-working-condition water chilling unit. The peak shifting and valley filling are realized through the double-working-condition water chilling unit and the ice cold storage device, the flexibility of an energy supply system is further improved, and the energy utilization efficiency is greatly improved.
Preferably, the energy supply system further comprises an ice making plate type heat exchanger, and the ice making plate type heat exchanger is used for refrigerating return water of the building cold supply equipment through the dual-working-condition water chiller; the water return inlet of the ice making plate type heat exchanger is communicated with the water return outlet of the building cooling equipment, the water return outlet of the ice making plate type heat exchanger is communicated with the inlet of the double-working-condition water chilling unit, the cold water inlet of the ice making plate type heat exchanger is communicated with the cold water outlet of the double-working-condition water chilling unit, and the cold water outlet of the ice making plate type heat exchanger is communicated with the cold water inlet of the building cooling equipment. And the cold energy generated by the double-working-condition refrigerating unit is utilized by the ice making plate type heat exchanger to cool the backwater at the user side of the building.
Preferably, the energy supply system further comprises a first ice melting plate type heat exchanger, a first cold water inlet of the first ice melting plate type heat exchanger is communicated with a cold water outlet of the ice cold storage device, a second cold water inlet of the first ice melting plate type heat exchanger is communicated with a cold water outlet of the ice making plate type heat exchanger, and a cold water outlet of the first ice melting plate type heat exchanger is communicated with a cold water inlet of the building cold supply equipment; the first ice melting plate type heat exchanger is used for further refrigerating cold water refrigerated by the ice making plate type heat exchanger by utilizing the flow state ice stored in the ice cold storage device. In order to further reduce the temperature of a cold source and reduce the energy consumption of a system, the first ice melting plate type heat exchanger is added to further refrigerate the cold water refrigerated by the ice making plate type heat exchanger, so that the requirement of the building cold supply equipment is met.
Preferably, the energy supply system further comprises a second ice melting plate type heat exchanger, and the second ice melting plate type heat exchanger is used for providing the outlet water of the lithium bromide absorption refrigeration unit and the lake water source heat pump unit to the building cold supply equipment after being recooled by using an ice cold storage device; and a first cold water inlet of the second ice melting plate type heat exchanger is communicated with a cold water outlet of the ice cold storage device, a second cold water inlet of the second ice melting plate type heat exchanger is communicated with a cold water outlet of the lithium bromide absorption type refrigerating unit, and the cold water outlet of the lithium bromide absorption type refrigerating unit is communicated with a cold water inlet of the building cold supply equipment, so that the energy is further saved.
Preferably, the energy supply system further comprises a waste heat boiler, a smoke-water heat exchanger and building heat supply equipment, wherein a heating smoke inlet of the waste heat boiler is communicated with a heating smoke outlet of the internal combustion engine set, a return water inlet of the waste heat boiler is communicated with a return water outlet of the building heat supply equipment, a hot water outlet of the waste heat boiler is communicated with a hot water inlet of the building heat supply equipment, a heating smoke outlet of the waste heat boiler is communicated with a heating smoke inlet of the smoke-water heat exchanger, and a hot water pipe of the lake water source heat pump unit penetrates through the smoke-water heat exchanger and then is communicated with a hot water inlet of the building heat supply equipment; the waste heat boiler is used for absorbing waste heat of the internal combustion engine set to produce hot water and then supplying the hot water to the building heating equipment; and the smoke-water heat exchanger is used for absorbing the waste heat of the waste heat boiler, reheating the outlet water of the lake water source heat pump unit and then supplying the reheated outlet water to the building heat supply equipment. In winter, the waste heat generated by the internal combustion engine set is transferred into the waste heat boiler to heat water and then is supplied to the building heating equipment, so that the building is heated, and the energy is saved.
Preferably, the energy supply system further comprises a phase-change heat storage device, the phase-change heat storage device is used for storing the waste heat of the outlet of the smoke-water heat exchanger in a phase-change heat storage water tank, the stored heat energy is gradually released according to the heat demand in the heat utilization peak period or the electricity utilization peak period, the heating smoke inlet of the phase-change heat storage device is communicated with the heating smoke outlet of the smoke-water heat exchanger, and the heating smoke outlet of the smoke-water heat exchanger is communicated with the hot water inlet of the building heat supply equipment. The waste heat of the smoke-water heat exchanger is utilized again through the phase change heat storage device, so that the heat is utilized to the maximum extent.
Preferably, the energy supply system further comprises a gas boiler, a hot water outlet of the gas boiler is communicated with a hot water inlet of the building heat supply equipment, a return water inlet of the gas boiler is communicated with a return water outlet of the building heat supply equipment, and the gas boiler is used for producing hot water and supplying the hot water to the building heat supply equipment. When the heat energy provided by the waste heat boiler phase change heat storage device and the lake water source heat pump unit cannot meet the requirement of building heating equipment, the heat energy is provided for the building through the gas boiler.
Compared with the prior art, the invention has the beneficial effects that: this application absorbs the heat energy that the internal-combustion engine set electricity generation in-process produced and makes cold water through lithium bromide absorption refrigeration unit to for building cooling equipment provides cold volume, realized recycling of the energy, then when the cold volume that lithium bromide absorption refrigeration unit produced can not satisfy the building demand, building cooling equipment passes through lake water source heat pump unit and realizes the heat exchange with the water in the earth's surface, thereby realizes the regeneration of the energy. The internal combustion engine unit, the lithium bromide absorption refrigerating unit and the lake water source heat pump unit jointly run for cooling, so that the consumption of electric energy is saved.
Description of the drawings:
FIG. 1 is a schematic structural diagram of an energy supply system combining a regional distributed energy system and a lake water source heat pump according to the present application;
FIG. 2 is a schematic structural diagram of the energy supply system combining the regional distributed energy system and the lake water source heat pump for summer operation;
fig. 3 is a schematic structural diagram of the winter operation of the energy supply system combining the regional distributed energy system and the lake water source heat pump provided by the present application.
The labels in the figure are: 1-an internal combustion engine set, 2-an electricity utilization terminal, 3-a lithium bromide absorption refrigerating unit, 4-a lake water source heat pump unit, 5-a double-working-condition water chilling unit, 6-an ice storage device, 7-an ice making plate type heat exchanger, 8-a first ice melting plate type heat exchanger, 9-a second ice melting plate type heat exchanger, 10-a smoke-water heat exchanger, 11-a waste heat boiler, 12-a gas boiler, 13-a building cooling device, 14-a building heating device and 15-a phase change heat storage device.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
As shown in fig. 1, the present application provides an energy supply system combining a regional distributed energy system and a lake water source heat pump, which comprises an internal combustion engine set 1, a lithium bromide absorption refrigeration unit 3, a lake water source heat pump set 4, a building cold supply device 13, a dual-working-condition water chilling unit 5, a waste heat boiler 11 and a smoke-water heat exchanger 10.
The internal combustion engine set 1 is a power generating device, generates electricity by acting, and is used for the operation of the lithium bromide absorption refrigerating unit 3, the lake water source heat pump set 4, the building refrigerating equipment and the building heating equipment. The internal combustion engine set compresses air through the compressor turbine, high-pressure air is mixed and combusted with natural gas in the combustion chamber, smoke expands to do work, the power turbine is pushed to rotate to do work to drive the generator to generate electricity, the generated electric energy supplies power for the power utilization terminal, and the discharged high-temperature smoke is conveyed to the next-stage heat utilization equipment for use.
The waste heat boiler 11 produces heat by using waste heat discharged by the internal combustion engine unit 1, and meets the heat requirement of the building heat supply equipment 14. The working principle of the waste heat boiler is as follows: the fuel is combusted to generate high-temperature flue gas which releases heat, the high-temperature flue gas firstly enters a hearth, then enters a waste heat recovery device of a front smoke box, then enters a smoke and fire tube, and finally enters a waste heat recovery device in a smoke channel of a rear smoke box to produce hot water or steam.
And the gas boiler 12 is used for producing heat, adjusting peak for heating in winter and ensuring building heating. The working principle of the gas boiler is as follows: after the gas boiler is powered on, the control system starts to detect the water level and the shell temperature of the boiler, the detection is normal, the boiler starts to start the burner to heat water, when the water temperature reaches a set temperature, the burner stops heating, meanwhile, the water temperature of the boiler reaches the pump-on temperature, the boiler starts the hot water circulating pump, hot water circulates in the heating pipeline system, and the heating purpose is achieved through heat dissipation of a radiator (such as a heating radiator, a fan coil water heating air conditioner, a central air conditioning unit and the like).
The lithium bromide absorption refrigerating unit 3 utilizes the waste heat generated by the power generation of the internal combustion engine unit 1 for producing cold energy and meeting the cold requirement of the building refrigerating equipment. The working principle of the lithium bromide absorption refrigerator is as follows: water as the refrigerant and lithium bromide as the absorbent. The heat energy discharged by the internal combustion engine set is used as power, and when the lithium bromide water solution is heated by high-temperature flue gas in the generator, the water in the solution is continuously vaporized; along with the continuous vaporization of water, the concentration of the lithium bromide aqueous solution in the generator is continuously increased and enters the absorber; the water vapor enters a condenser, is cooled by cooling water in the condenser and then is condensed to form high-pressure low-temperature liquid water; when the water in the condenser enters the steam generator through the throttle valve, it expands rapidly and vaporizes, and absorbs a large amount of heat of refrigerant water in the evaporator in the process of vaporization, thus achieving the purpose of cooling and refrigeration.
The lake water source heat pump unit 4 uses surface water to exchange heat and cold to serve as a cold and heat source of a water source heat pump, heat in lake water is taken out in winter and supplied to indoor heating, and the lake water is a heat source at the moment; in summer, indoor heat is discharged and released into surface water, and the lake water is a cold source. In summer, the cold energy generator and the double-working-condition water chilling unit 5 and the lithium bromide absorption refrigerating unit 3 run jointly to generate cold energy so as to meet the cold requirement of the building cold supply equipment 13; under the working condition in winter, the heat recovery system operates in combination with the waste heat boiler 11 and the gas boiler 12 to produce heat and meet the heat requirement of the building. The working principle of the lake water source heat pump unit is as follows: the low-grade heat energy resource formed by absorbing solar energy by the lake water is used, the lake water is used as a cold and heat source, and the heat pump principle is adopted, so that the heat in the building is transferred to the lake water by the lake water source heat pump unit in summer, and the cold supply of the building is realized; in winter, heat is extracted from lake water to realize building heat supply. Low grade heat energy resources are heat energy which is difficult to utilize.
The double-working-condition water chilling unit 5 is used for making water into flow state ice and storing the flow state ice in the ice cold storage device 6 in the valley period of cold quantity demand, and releasing the cold quantity in the ice cold storage device 6 to meet the cold demand of a building in the peak period of the cold quantity demand, so that the double-working-condition water chilling unit has the function of shifting peaks and filling valleys. The working principle of the double-working-condition water chilling unit is as follows: in daytime, the glycol liquid cooled by the main machine flows through the ice making plate type heat exchanger to convey cold energy to the tail end of the air conditioner, the temperature of the glycol liquid before entering the ice making plate type heat exchanger is 3.5 ℃, the temperature of the secondary refrigerant after passing through the ice making plate type heat exchanger is increased to 10.5 ℃, and the secondary refrigerant flows back to the refrigerating unit through the refrigerating pump; at night, the ethylene glycol liquid with 20% concentration of the secondary refrigerant flows through the host to be cooled, and then is conveyed to the ice storage device to cool the water in the ice storage device, the temperature is generally reduced to about minus 3 ℃, meanwhile, the ethylene glycol liquid is conveyed out by a pipeline on the other side of the ice storage device and flows back to the host through the refrigerating pump, and thus, the low-temperature ethylene glycol circularly cools the water in the ice storage device.
And the ice making plate type heat exchanger 7 is used for cooling the backwater at the user side of the building by using the cold energy generated by the double-working-condition refrigerating unit. The working principle of the ice making plate type heat exchanger is as follows: the glycol liquid cooled by the main machine flows through the ice making plate type heat exchanger, the temperature is about 3.5 ℃ before entering the ice making plate type heat exchanger, after heat exchange is carried out on the glycol liquid and the return water of the building cooling equipment, the temperature of the glycol liquid rises to about 10.5 ℃, and the return water is cooled and used for building cooling.
The working principle of the ice cold storage device is as follows: storing the flow state ice made by the double-working-condition water chilling unit in an ice storage tank, when the load is at peak load in the daytime, conveying water at 0 ℃ in the ice storage tank into the ice melting plate type heat exchanger for heat exchange, refluxing the high-temperature water after heat exchange to the ice storage tank, spraying the high-temperature water on ice to directly melt the ice, keeping the water outlet temperature at about 3.5 ℃ as long as the ice exists in the tank, and providing cold water at 5-7 ℃ for the other side of the ice melting plate type heat exchanger for cold supply of a building.
And the first ice melting plate type heat exchanger 8 is used for cooling the outlet water of the ice making plate type heat exchanger 7 by using the cold energy released by the ice cold accumulation device 6, so that the outlet water reaches a set value, and the energy consumption of the system is reduced.
And the second ice melting plate type heat exchanger 9 is used for recooling outlet water at the air conditioning unit side by using cold energy released by the ice cold accumulation device 6 to enable the outlet water to reach a set value, so that the energy consumption of the system is reduced.
The working principle of the ice melting plate type heat exchanger is as follows: and water at 0 ℃ in the ice cold accumulation device 6 is conveyed into the ice melting plate type heat exchanger for heat exchange, and cold water at 5-7 ℃ is provided for the other side of the ice melting plate type heat exchanger for cold supply of the building.
And the smoke-water heat exchanger 10 is used for reheating the outlet water at the air conditioner side of the lake water source heat pump unit 4 by utilizing the waste heat at the outlet of the waste heat boiler 11 to enable the outlet water to reach a set value, and improving the heat supply energy efficiency of the lake water source heat pump system. The working principle of the smoke-water heat exchanger is as follows: one side of the heat exchange surface is used for passing through flue gas, the other side of the heat exchange surface is used for passing through water to be heated, and the flue gas and the water are subjected to heat exchange to heat the water, so that the temperature of the water is increased, the flue gas exhaust temperature is reduced, and the utilization degree of flue gas waste heat is increased.
And the phase change heat storage device 15 is used for storing the redundant heat at the outlet of the smoke-water heat exchanger 10 in a phase change heat storage water tank and gradually releasing the stored heat energy according to the building heat demand in the heat utilization peak period or the electricity utilization peak period. The working principle of the phase change heat storage device is as follows: the heat energy provided by the heat source is stored in the phase-change heat storage water tank, and the stored heat energy is gradually released according to the heat demand of a user in the heat utilization peak period or the electricity utilization peak period to produce hot water for supplying heat to the building.
The building cooling equipment 13 performs heat exchange between cold water produced by the air conditioning unit and air in an indoor room of the building to cool the air in the indoor room, so that the purpose of cooling is achieved.
The refrigerating or heating equipment such as the internal combustion engine unit 1, the lithium bromide absorption refrigerating unit 3, the lake water source heat pump unit 4, the dual-working-condition water chilling unit 5 and the like in the application can respectively comprise one or more same equipment, if the plurality of equipment are connected in parallel, the output is carried out, and the inlets are also connected in parallel. For example, the lithium bromide absorption refrigerator set 3 may be one lithium bromide absorption refrigerator or a plurality of lithium bromide absorption refrigerators, and if the lithium bromide absorption refrigerator is a plurality of lithium bromide absorption refrigerators, each lithium bromide absorption refrigerator is connected in parallel, and the output end after the parallel connection is communicated with the building cooling equipment for cooling.
The energy supply system further comprises a signal feedback network, wherein the signal feedback network is used for monitoring the lithium bromide absorption refrigerating unit 3, the lake water source heat pump unit 4, the double-working-condition water chilling unit 5 and the like and the real-time electricity utilization condition of the building terminal equipment and controlling the transmission of the electric quantity.
As shown in fig. 2, the energy supply system combining the regional distributed energy system and the lake water source heat pump provided by the present application is schematically configured in summer.
The internal combustion engine set 1 is used for generating power, and the internal combustion engine set 1 is used for generating power to supply power to the power utilization terminal 2; the lithium bromide absorption refrigerating unit 3 is used for absorbing the waste heat of the internal combustion engine unit 1, supplying the cooled water to the building cooling equipment 13; the lake water source heat pump unit 4 is used for refrigerating return water of the building cooling equipment and then supplying the return water to the building cooling equipment 13.
The heating smoke inlet of the lithium bromide absorption refrigerating unit 3 is connected with the heating smoke outlet of the internal combustion engine unit 1, the cold water outlet of the lithium bromide absorption refrigerating unit 3 is connected with the cold water inlet of the building cold supply equipment 13, the backwater of the building cold supply equipment 13 flows out and then is divided into three branches, the first branch flows into the backwater inlet of the lithium bromide absorption refrigerating unit 3, the second branch flows into the backwater inlet of the lake water source heat pump unit 4, and the cold water outlet of the lake water source heat pump unit 4 is communicated with the cold water inlet of the building cold supply equipment 13 after being combined with the cold water outlet of the lithium bromide absorption refrigerating unit 3. And the third backwater of the building cold supply equipment 13 is communicated with the backwater inlet of the ice making plate type heat exchanger 7.
The cold water outlet of the double-working-condition water chilling unit 5 is divided into two branches, one branch of cold water outlet is connected with the cold water inlet of the ice making plate type heat exchanger 7, and the other branch of cold water outlet is connected with the cold water inlet of the ice cold storage device 6. And a cold water outlet of the ice cold storage device 6 is communicated with a first cold water inlet of the first ice melting plate type heat exchanger 8 and a first cold water inlet of the second ice melting plate type heat exchanger 9, and a backwater outlet of the first ice melting plate type heat exchanger 8 and a backwater outlet of the second ice melting plate type heat exchanger 9 are communicated with a backwater inlet of the ice cold storage device 6. And a second cold water inlet of the first ice melting plate type heat exchanger 8 is communicated with a cold water outlet of the ice making plate type heat exchanger 7, a second cold water inlet of the second ice melting plate type heat exchanger 9 is communicated with a cold water outlet of the lithium bromide absorption refrigerating unit 3, and a cold water outlet of the first ice melting plate type heat exchanger 8 and a cold water outlet of the second ice melting plate type heat exchanger 9 are communicated with a cold water inlet of the building cold supply equipment 13. And a backwater outlet of the ice cold storage device 6 is communicated with a backwater inlet of the double-working-condition water chilling unit 5. And a backwater outlet of the ice making plate type heat exchanger 7 is communicated with an inlet of the double-working-condition water chilling unit 5.
Lake water inlets of the lake water source heat pump unit 4 and the dual-working-condition water chilling unit 5 are communicated with lake water, and lake water outlets of the lake water source heat pump unit 4 and the dual-working-condition water chilling unit 5 are also communicated with the lake water.
The internal combustion engine set 1 can adopt natural gas as fuel to be input into the internal combustion engine set 1 to do work and generate electricity. High-temperature flue gas from the outlet of the internal combustion engine set 1 enters the lithium bromide absorption refrigerating unit 3 for refrigeration, and insufficient building cold energy is provided by the lake water source heat pump unit 4 and the dual-working-condition water chilling unit 5, so that the lake water source heat pump unit 4, the lithium bromide absorption refrigerating unit 3 and the dual-working-condition water chilling unit 5 can run in a complementary mode to meet the building cold requirement. In daytime, the ice cold storage device 6 is used for cooling preferentially, backwater on the user side flows through the ice making plate type heat exchanger 7 for cooling, then flows through the first ice melting plate type heat exchanger 8 for cooling to the set temperature, and is supplied to the user. When the temperature of the user is not high, the lake water source heat pump unit 4 and the lithium bromide absorption refrigerating unit 3 are partially started, the user side backwater flows through the lake water source heat pump unit 4 and the lithium bromide absorption refrigerating unit 3 to be cooled, then flows through the second ice melting plate type heat exchanger 9 to be cooled to the set temperature, and is supplied to the user. At night, the double-working-condition water chilling unit 5 is started to prepare the fluid ice at the low valley price and full load. The lake water source heat pump unit 4 and the lithium bromide absorption refrigerating unit 3 provide cold energy for the building, and the insufficient part is provided by the ice cold storage device 6. Meanwhile, the power consumption of the unit and the building terminal equipment is monitored in real time through a signal feedback network, and the transmission of the power is controlled.
The heat of the heating flue gas of the internal combustion engine set 1 and the return water of the lithium bromide absorption refrigerating unit are subjected to heat exchange in the lithium bromide absorption refrigerating unit, so that the temperature of the return water of the lithium bromide absorption refrigerating unit 3 is lower than that of the cold water of the lithium bromide absorption refrigerating unit 3. Similarly, the temperature of cold water flowing out of the cold water outlet of the lake water source heat pump unit 4 is lower than that of return water flowing in from the return water inlet, the temperature of return water flowing out of the return water inlet of each unit is higher than that of cold water flowing out of the cold water outlet of each unit as well as that of the double-working-condition cold water unit 5, the ice cold storage device 6, the ice making plate type heat exchanger 7, the first ice melting plate type heat exchanger 8 and the second ice melting plate type heat exchanger 9.
The flow rates of the lake water inlet and the lake water outlet of the lake water source heat pump unit 4 are set according to actual requirements, and the flow rates of the lake water inlet and the lake water outlet of the dual-working-condition water chilling unit 5 are also set according to the actual requirements. The flow rate of the lake water inlet and the lake water outlet is the same in general. The flow rates of the heating flue gas flowing into the lithium bromide absorption refrigerating unit 3 by the internal combustion engine unit 1 and the heating flue gas sprayed out by the lithium bromide absorption refrigerating unit 3 are the same.
As shown in fig. 3, the energy supply system combining the regional distributed energy system and the lake water source heat pump provided by the present application is schematically operated in winter.
The waste heat boiler 11, the lake water source heat pump unit 4, the smoke-water heat exchanger 10 and the phase change heat storage device 15 are connected in series. The heating flue gas inlet of the waste heat boiler 11 is communicated with the heating flue gas outlet of the internal combustion engine unit 1, the return water inlet of the waste heat boiler 11 is communicated with the return water outlet of the building heat supply equipment 14, the hot water outlet of the waste heat boiler 11 is communicated with the hot water inlet of the building heat supply equipment 14, the heating flue gas outlet of the waste heat boiler 11 is communicated with the heating flue gas inlet of the smoke-water heat exchanger 10, and a hot water pipe of the lake water source heat pump unit 4 is communicated with the hot water inlet of the building heat supply equipment 14 after the smoke-water heat exchanger 10 exchanges heat with the heating flue gas. The heating flue gas inlet of the phase change heat storage device 15 is communicated with the heating flue gas outlet of the flue gas-water heat exchanger 10, and the heating flue gas outlet of the flue gas-water heat exchanger 10 is communicated with the hot water inlet of the building heat supply equipment 14.
The waste heat boiler 11 is used for absorbing waste heat of the internal combustion engine unit 1 to produce hot water and then supplying the hot water to the building heating equipment 14; the smoke-water heat exchanger 10 is used for absorbing the waste heat of the waste heat boiler 11 to reheat the outlet water of the lake water source heat pump unit 4 and then supplying the reheated outlet water to the building heat supply equipment 14. The phase change heat storage device 15 is used for storing the waste heat at the outlet of the smoke-water heat exchanger 10 in a phase change heat storage water tank, and gradually releases the stored heat energy according to the heat demand in the heat utilization peak period or the electricity utilization peak period.
The natural gas enters the internal combustion engine set 1 to be combusted, expanded and worked to generate power for the operation of the set and the building terminal equipment. High-temperature flue gas from the internal combustion engine unit 1 enters a waste heat boiler 11 for heating, flue gas from the waste heat boiler 11 enters a flue-water heat exchanger 10 for reheating the outlet water at the air conditioning side of the lake water source heat pump unit 4 to a set temperature for supplying to a user, a phase change heat storage device 15 stores redundant heat in a phase change heat storage water tank, and the stored heat energy is gradually released according to the building heat demand in a heat utilization peak period or an electricity utilization peak period, so that the waste heat utilization is maximized, and the building heat demand in winter is met. The insufficient building heat energy is supplemented by the gas boiler 12, so that the stable supply of the building heat energy is ensured, and the gas boiler 12 plays a role in heating and peak shaving in winter of the building. Meanwhile, the power consumption of the unit and the building terminal equipment is monitored in real time through a signal feedback network, and the transmission of the power is controlled.
The lake water source heat pump unit 4 used by the regional distributed energy system and the lake water source heat pump composite energy supply system in winter and summer can be the same device. The cold quantity and the cold source are cold water, and the heat quantity and the heat source are hot water. Cold, heat and heat sources are all carriers. The connection between each unit is connected through a pipeline.
The invention has the following beneficial effects:
1. the energy supply system combining the regional distributed energy system and the lake water source heat pump comprehensively utilizes multiple energy technologies of renewable energy sources such as heat energy, natural gas energy and lake water generated by the internal combustion engine set 1, and the three energy systems are jointly operated to exert respective advantages, ensure the stability of energy supply of the system and greatly reduce the operation cost of the system.
2. The energy supply system combining the regional distributed energy system and the lake water source heat pump fully considers the night valley electricity price, utilizes the ice cold accumulation device 6 to accumulate cold at night, releases cold energy in the daytime, realizes peak shifting and valley filling, further improves the flexibility of the combined energy supply system, and greatly improves the energy utilization efficiency.
3. According to the energy supply system combining the regional distributed energy system and the lake water source heat pump, the internal combustion engine set realizes high-temperature section power generation, medium-temperature section refrigeration or heating and low-temperature section waste heat reutilization, and the energy is utilized step by step for multiple times, so that the performance efficiency of the whole internal combustion engine set is improved, and the gradient utilization of energy is realized.
4. According to the energy supply system combining the regional distributed energy system and the lake water source heat pump, waste heat discharged by the distributed energy system is utilized to reheat the lake water source heat pump system, and the heating efficiency of the lake water source heat pump system is improved by improving the water outlet temperature of the lake water source heat pump unit 4.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A regional distributed energy system and lake water source heat pump composite energy supply system is characterized by comprising an internal combustion engine set (1), a lithium bromide absorption refrigerating unit (3), a lake water source heat pump set (4) and building cold supply equipment (13); the internal combustion engine set (1) is used for generating electricity to supply power to the power utilization terminal (2); the lithium bromide absorption refrigerating unit (3) is used for absorbing waste heat of the internal combustion engine unit (1), supplying water for cooling and then supplying the water to the building cooling equipment (13); the lake water source heat pump unit (4) is used for refrigerating return water of the building cooling equipment and then supplying the return water to the building cooling equipment (13);
the heating smoke inlet of the lithium bromide absorption refrigerating unit (3) is connected with the heating smoke outlet of the internal combustion engine unit (1), the cold water outlet of the lithium bromide absorption refrigerating unit (3) is connected with the cold water inlet of the building cold supply equipment (13), the backwater of the building cold supply equipment (13) flows out and then is divided into two branches, one branch flows into the backwater inlet of the lithium bromide absorption refrigerating unit (3), the other branch flows into the backwater inlet of the lake water source heat pump unit (4), and the cold water outlet of the lake water source heat pump unit (4) is communicated with the cold water inlet of the building cold supply equipment (13) after being combined with the cold water outlet of the lithium bromide absorption refrigerating unit (3).
2. The energy supply system of claim 1, characterized in that the energy supply system further comprises a dual-working condition water chilling unit (5) and an ice storage device (6), wherein the dual-working condition water chilling unit (5) is used for refrigerating return water of the building cooling equipment (13) and then providing a cold source for the building cooling equipment (13); the double-working-condition water chilling unit (5) is also used for preparing fluid ice and storing the fluid ice in the ice cold storage device (6); the ice cold storage device (6) is used for storing fluid ice and releasing the cold energy of the fluid ice to provide a cold source for the building cold supply equipment (13); the return water import of two operating mode cooling water set (5) with the return water export intercommunication of building cooling equipment (13), the cold water export of two operating mode cooling water set (5) divides two, one with the cold water access connection of building cooling equipment (13), another one with the cold water access connection of ice cold-storage device (6), the cold water export of ice cold-storage device (6) with the cold water import intercommunication of building cooling equipment (13), the return water export of ice cold-storage device (6) with the return water import intercommunication of two operating mode cooling water set (5).
3. The energy supply system according to claim 2, characterized in that the energy supply system further comprises an ice making plate type heat exchanger (7), wherein the ice making plate type heat exchanger (7) is used for refrigerating return water of the building cold supply equipment (13) through the dual-working-condition water chilling unit (5); the backwater inlet of the ice making plate type heat exchanger (7) is communicated with the backwater outlet of the building cooling equipment (13), the backwater outlet of the ice making plate type heat exchanger (7) is communicated with the inlet of the double-working-condition water chilling unit (5), the cold water inlet of the ice making plate type heat exchanger (7) is communicated with the cold water outlet of the double-working-condition water chilling unit (5), and the cold water outlet of the ice making plate type heat exchanger (7) is communicated with the cold water inlet of the building cooling equipment (13).
4. An energy supply system according to claim 3, characterized in that it further comprises a first ice-melting plate heat exchanger (8), the first cold water inlet of said first ice-melting plate heat exchanger (8) communicating with the cold water outlet of said ice thermal storage device (6), the second cold water inlet of said first ice-melting plate heat exchanger (8) communicating with the cold water outlet of said ice-making plate heat exchanger (7), the cold water outlet of said first ice-melting plate heat exchanger (8) communicating with the cold water inlet of said building cold supply apparatus (13); the first ice melting plate type heat exchanger (8) is used for further refrigerating cold water refrigerated by the ice making plate type heat exchanger (7) by utilizing the flow state ice stored in the ice cold storage device (6).
5. A power supply system according to claim 3, characterized in that the power supply system further comprises a second ice melting plate type heat exchanger (9), and the second ice melting plate type heat exchanger (9) is used for providing the outlet water of the lithium bromide absorption refrigeration unit (3) and the lake water source heat pump unit (4) to the building cooling equipment (13) after being recooled by the ice cold storage device (6); and a first cold water inlet of the second ice melting plate type heat exchanger (9) is communicated with a cold water outlet of the ice cold storage device (6), a second cold water inlet of the second ice melting plate type heat exchanger (9) is communicated with a cold water outlet of the lithium bromide absorption refrigerating unit (3), and a cold water outlet of the lithium bromide absorption refrigerating unit (3) is communicated with a cold water inlet of the building cold supply equipment (13).
6. Energy supply system according to any one of claims 1-5, characterized in that the energy supply system further comprises a waste heat boiler (11), a smoke-water heat exchanger (10) and a building heating installation (14), a heating flue gas inlet of the waste heat boiler (11) is communicated with a heating flue gas outlet of the internal combustion engine set (1), a backwater inlet of the waste heat boiler (11) is communicated with a backwater outlet of the building heating equipment (14), a hot water outlet of the waste heat boiler (11) is communicated with a hot water inlet of the building heating equipment (14), the heating smoke outlet of the waste heat boiler (11) is communicated with the heating smoke inlet of the smoke-water heat exchanger (10), a hot water pipe of the lake water source heat pump unit (4) penetrates through the smoke-water heat exchanger (10) and then is communicated with a hot water inlet of the building heat supply equipment (14);
the waste heat boiler (11) is used for absorbing waste heat of the internal combustion engine set (1) to produce hot water and then supplying the hot water to the building heating equipment (14); the smoke-water heat exchanger (10) is used for absorbing the waste heat of the waste heat boiler (11) to reheat the outlet water of the lake water source heat pump unit (4) and then supplying the outlet water to the building heat supply equipment (14).
7. The energy supply system according to claim 6, characterized in that the energy supply system further comprises a phase-change heat storage device (15), the phase-change heat storage device (15) is used for storing the residual heat of the outlet of the smoke-water heat exchanger (10) in a phase-change heat storage water tank, and gradually releasing the stored heat energy according to the heat demand in the peak period of heat consumption or the peak period of electricity consumption, the heating smoke inlet of the phase-change heat storage device (15) is communicated with the heating smoke outlet of the smoke-water heat exchanger (10), and the heating smoke outlet of the smoke-water heat exchanger (10) is communicated with the hot water inlet of the building heat supply equipment (14).
8. A power supply system according to claim 6, characterized in that said power supply system further comprises a gas boiler (12), a hot water outlet of said gas boiler (12) is communicated with a hot water inlet of said building heat supply equipment (14), a return water inlet of said gas boiler (12) is communicated with a return water outlet of said building heat supply equipment (14), said gas boiler (12) is used for producing hot water and supplying it to said building heat supply equipment (14).
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| CN115507405A (en) * | 2022-09-28 | 2022-12-23 | 清华大学 | A district energy system and its operation mode |
| CN115507405B (en) * | 2022-09-28 | 2024-06-11 | 清华大学 | A regional energy system and operation mode |
| CN115614861A (en) * | 2022-09-29 | 2023-01-17 | 重庆清研理工智能控制技术研究院有限公司 | A district-level energy storage cooling system and method utilizing surplus energy of enterprises |
| CN115789811A (en) * | 2022-11-30 | 2023-03-14 | 青岛海尔空调器有限总公司 | Method and device for controlling heat pump system, heat pump system and storage medium |
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| CN111219906B (en) | 2024-11-29 |
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