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 is cold-supplying and consumes more electric energy.
In order to achieve the above object, the present invention provides the following technical solutions:
An energy supply system combining a regional distributed energy system and a lake water source heat pump,
The system comprises an internal combustion engine unit, a lithium bromide absorption refrigerating unit, a lake water source heat pump unit and building cooling equipment, wherein the internal combustion engine unit is used for generating electricity to supply power for a power utilization terminal, the lithium bromide absorption refrigerating unit is used for absorbing the residual heat of the internal combustion engine unit to supply water for cooling and then supplying the cooled water to the building cooling equipment, and the lake water source heat pump unit is used for refrigerating backwater of the building cooling equipment and then supplying the backwater of the building cooling equipment to the building cooling equipment;
The heating flue gas inlet of the lithium bromide absorption refrigerating unit is connected with the heating flue gas 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 cold supply equipment, backwater of the building cold supply equipment flows out and then is divided into two branches, one branch flows into the backwater inlet of the lithium bromide absorption refrigerating unit, the other branch flows into the backwater inlet of the lake water source heat pump unit, and the cold water outlet of the lake water source heat pump unit is combined with the cold water outlet of the lithium bromide absorption refrigerating unit and then is communicated with the cold water inlet of the building cold supply equipment.
The energy supply system comprises a building cooling device, a building cooling water supply device, an ice cold storage device, a double-working-condition water chilling unit, an ice cold storage device and a double-working-condition water chilling unit, wherein the double-working-condition water chilling unit is used for refrigerating backwater of the building cooling device and then providing a cold source for the building cooling device, the double-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 the fluid ice and releasing cold of the fluid ice to provide the cold source for the building cooling device, a backwater inlet of the double-working-condition water chilling unit is communicated with a backwater outlet of the building cooling device, a 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 device, the other branch is connected with the cold water inlet of the ice cold storage device, and a cold water outlet of the ice cold storage device is communicated with the backwater 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, so that 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 heat exchanger, wherein the ice-making plate heat exchanger is used for refrigerating backwater of the building cooling equipment through the double-working-condition water chilling unit, a backwater inlet of the ice-making plate heat exchanger is communicated with a backwater outlet of the building cooling equipment, a backwater outlet of the ice-making plate heat exchanger is communicated with an inlet of the double-working-condition water chilling unit, a cold water inlet of the ice-making plate heat exchanger is communicated with a cold water outlet of the double-working-condition water chilling unit, and a cold water outlet of the ice-making plate heat exchanger is communicated with a cold water inlet of the building cooling equipment. And cooling the backwater of the user side of the building by using the cold energy generated by the double-working-condition refrigerating unit through the ice-making plate type heat exchanger.
Preferably, the energy supply system further comprises a first ice melting plate heat exchanger, a first cold water inlet of the first ice melting plate heat exchanger is communicated with a cold water outlet of the ice storage device, a second cold water inlet of the first ice melting plate heat exchanger is communicated with a cold water outlet of the ice making plate heat exchanger, a cold water outlet of the first ice melting plate heat exchanger is communicated with a cold water inlet of the building cold supply device, and the first ice melting plate heat exchanger is used for further refrigerating cold water refrigerated by the ice making plate heat exchanger by utilizing fluid ice stored in the ice storage device. In order to further reduce the temperature of the cold source and reduce the energy consumption of the system, the first ice-melting plate type heat exchanger is added, and cold water refrigerated by the ice-making plate type heat exchanger is further refrigerated, so that the requirements of building cooling equipment are met.
Preferably, the energy supply system further comprises a second ice-melting plate heat exchanger, the second ice-melting plate heat exchanger is used for utilizing the ice cold accumulation device to re-cool outlet water of the lithium bromide absorption refrigerating unit and the lake water source heat pump unit and then providing the water for the building cooling equipment, a first cold water inlet of the second ice-melting plate heat exchanger is communicated with a cold water outlet of the ice cold accumulation device, a second cold water inlet of the second ice-melting plate heat exchanger is communicated with a cold water outlet of the lithium bromide absorption refrigerating unit, and a cold water outlet of the lithium bromide absorption refrigerating unit is communicated with a cold water inlet of the building cooling equipment, so that 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 unit, a backwater inlet of the waste heat boiler is communicated with a backwater 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, a hot water pipe of the lake water source heat pump unit is communicated with a hot water inlet of the building heat supply equipment after passing through the smoke-water heat exchanger, the waste heat boiler is used for absorbing waste heat of the internal combustion unit to produce hot water and then providing the hot water to the building heat supply equipment, and the smoke-water heat exchanger is used for absorbing waste heat of the waste heat boiler to reheat water discharged from the lake water source heat pump unit and then provide the hot water to the building heat supply equipment. When in winter, the waste heat generated by the internal combustion engine unit is transmitted into the waste heat boiler to heat water and then is supplied to the building heat supply equipment, so that heating of a building is realized, and energy sources are saved.
Preferably, the energy supply system further comprises a phase change heat storage device, the phase change heat storage device is used for storing waste heat absorbed by the outlet of the smoke-water heat exchanger in the phase change heat storage water tank, the stored heat energy is gradually released according to heat requirements in a heat consumption peak period or an electricity consumption peak period, a heating smoke inlet of the phase change heat storage device is communicated with a heating smoke outlet of the smoke-water heat exchanger, and a heating smoke outlet of the smoke-water heat exchanger is communicated with a 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 greatest 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 device, a return water inlet of the gas boiler is communicated with a return water outlet of the building heat supply device, and the gas boiler is used for producing hot water and supplying the hot water to the building heat supply device. When the heat energy provided by the phase-change heat storage device of the waste heat boiler and the lake water source heat pump unit can not meet the requirements of building heating equipment, the heat energy is provided for the building through the gas-fired boiler.
Compared with the prior art, the application has the beneficial effects that the lithium bromide absorption refrigerating unit absorbs the heat energy generated in the power generation process of the internal combustion unit to prepare cold water, so that the cold energy is provided for the building cold supply equipment, the reutilization of energy is realized, and then when the cold energy generated by the lithium bromide absorption refrigerating unit can not meet the building requirement, the building cold supply equipment realizes heat exchange with the water in the ground surface through the lake water source heat pump unit, so that the reutilization of energy is realized. The internal combustion unit, the lithium bromide absorption refrigerating unit and the lake water source heat pump unit are combined to operate for cooling, so that the consumption of electric energy is saved.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, mechanical or electrical, or may be in communication with each other between two elements, directly or indirectly through intermediaries, as would be understood by those skilled in the art, in view of the specific meaning of the terms described above.
As shown in fig. 1, the application provides a regional distributed energy system and lake water source heat pump combined energy supply system, which comprises an internal combustion engine unit 1, a lithium bromide absorption refrigerating unit 3, a lake water source heat pump unit 4, building cooling equipment 13, a double-condition water chilling unit 5, a waste heat boiler 11 and a smoke-water heat exchanger 10.
The internal combustion unit 1 is a power generation device and is used for running a lithium bromide absorption refrigerating unit 3, a lake water source heat pump unit 4, building refrigerating equipment and building heating equipment by acting to generate power. The internal combustion unit compresses air through the compressor turbine, high-pressure air is mixed and combusted with natural gas in the combustion chamber, so that the flue gas 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 is used for supplying power to the electricity utilization terminal, and the discharged high-temperature flue gas is transmitted to next-stage heat utilization equipment for use.
The waste heat boiler 11 utilizes the waste heat discharged by the internal combustion engine set 1 to produce heat and meets the heat requirement of the building heat supply equipment 14. The working principle of the waste heat boiler is that the fuel generates high-temperature smoke to release heat after combustion, the high-temperature smoke enters the hearth, then enters the waste heat recovery device of the front smoke box, then enters the smoke tube, and finally enters the waste heat recovery device in the flue of the rear smoke box to produce hot water or steam.
The gas boiler 12 is used for producing heat, carrying out peak shaving for heating in winter and guaranteeing building heating. The gas boiler has the working principle that 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 the 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 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 unit 1 to prepare cold energy, thereby meeting the cold requirement of building refrigerating equipment. The working principle of the lithium bromide absorption refrigerator is that water is used as a refrigerant and lithium bromide is used as an absorbent. The heat energy discharged by the internal combustion engine unit is used as power, when the lithium bromide aqueous solution is heated by high-temperature flue gas in the generator, the water in the solution is continuously vaporized, the concentration of the lithium bromide aqueous solution in the generator is continuously increased along with the continuous vaporization of the water and enters the absorber, the water vapor enters the condenser and is cooled by cooling water in the condenser and then is condensed into high-pressure low-temperature liquid water, when the water in the condenser enters the vapor generator through the throttle valve, the water is rapidly expanded and vaporized, and the heat of the refrigerant water in the evaporator is greatly absorbed in the vaporization process, so that the cooling and refrigerating purposes are achieved.
The lake water source heat pump unit 4 uses surface water to exchange cold and heat as a cold source of a water source heat pump, and takes heat in the lake water out in winter to supply indoor heating, wherein the lake water is the heat source, and the lake water is the cold source when the lake water is discharged from summer and released into the surface water. In summer, the heat pump is combined with the double-working-condition water chilling unit 5 and the lithium bromide absorption refrigerating unit 3 to generate cold energy to meet the cold requirement of the building cold supply equipment 13, and in winter, the heat pump is combined with the waste heat boiler 11 and the gas boiler 12 to produce heat to meet the building heat requirement. The working principle of the lake water source heat pump unit is that the lake water is used as a cold source by utilizing low-grade heat energy resources formed by solar energy absorbed by lake water, the heat pump principle is adopted, the heat in a building is transferred into the lake water by the lake water source heat pump unit in summer, so that the cooling of the building is realized, and in winter, the heat is extracted from the lake water, so that the heat supply of the building is realized. Low grade heat energy resources are heat energy which is difficult to utilize.
The double-working-condition water chilling unit 5 is used for preparing water into flow-state ice to be stored in the ice storage device 6 in the low-valley period of the cold energy demand, and releasing the cold energy in the ice storage device 6 to meet the cold energy demand of a building in the peak period of the cold energy demand, so that the double-working-condition water chilling unit has the effect of peak shifting and valley filling. The working principle of the dual-working-condition water chilling unit is that during daytime, glycol liquid cooled by a main machine flows through an ice-making plate heat exchanger, cold energy is conveyed to the tail end of an air conditioner, the temperature of the glycol liquid before entering the ice-making plate heat exchanger is 3.5 ℃, the temperature of a secondary refrigerant rises to 10.5 ℃ after the glycol liquid passes through the ice-making plate heat exchanger, the secondary refrigerant flows back to a refrigerating unit through a refrigerating pump, at night, 20% concentration of the glycol liquid of the secondary refrigerant flows through the main machine to be cooled, and then the glycol liquid is conveyed to an ice storage device to cool water in the ice storage device, the temperature is generally reduced to about-3 ℃, and meanwhile, the glycol liquid is conveyed out from a pipeline at the other side of the ice storage device and flows back to the main machine through the refrigerating pump, so that the low-temperature glycol circularly cools the water of the ice storage device.
And the ice-making plate heat exchanger 7 is used for cooling the backwater of the user side of the building by utilizing the cold energy generated by the double-working-condition refrigerating unit. The working principle of the ice-making plate heat exchanger is that the temperature of the glycol liquid cooled by the main machine flows through the ice-making plate heat exchanger, the temperature of the glycol liquid before entering the ice-making plate heat exchanger is about 3.5 ℃, the glycol liquid is heated to about 10.5 ℃ after heat exchange with backwater of building cooling equipment, and the backwater is cooled for building cooling.
The ice cold storage device has the working principle that fluid ice prepared by a double-working-condition water chilling unit is stored in an ice storage tank, 0 ℃ water in the ice storage tank is conveyed into an ice melting plate type heat exchanger to be subjected to heat exchange during daytime peak load, high temperature water after heat exchange flows back to an ice storage tank and is sprinkled on the ice to be directly subjected to ice melting, so that the water outlet temperature can be kept at about 3.5 ℃ all the time as long as ice is arranged in the tank, and 5-7 ℃ cold water is provided for the other side of the ice melting plate type heat exchanger to be used for cooling a building.
The first ice melting plate heat exchanger 8 is used for cooling the water discharged from the ice making plate heat exchanger 7 by utilizing the cold energy released by the ice storage device 6, so that the 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 utilizing the cold energy released by the ice cold accumulation device 6 to re-cool the outlet water at the side of the air conditioner unit, so that the outlet water reaches a set value, and the energy consumption of the system is reduced.
The ice melting plate heat exchanger has the working principle that water at 0 ℃ in the ice cold storage device 6 is conveyed into the ice melting plate heat exchanger for heat exchange, and cold water at 5-7 ℃ is provided for cooling a building on the other side of the ice melting plate heat exchanger.
The smoke-water heat exchanger 10 is used for reheating water at the air conditioner side outlet 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 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 that one side of the heat exchange surface passes through smoke, and the other side passes through water to be heated, so that the water is heated, the temperature of the water is increased, the smoke discharging temperature of the smoke is reduced, and the utilization degree of the smoke residual heat is improved.
The phase-change heat storage device 15 is used for storing the surplus heat at the outlet of the smoke-water heat exchanger 10 in the phase-change heat storage water tank, and gradually releasing the stored heat energy according to the heat requirement of the building in the heat utilization peak period or the electricity utilization peak period. The working principle of the phase-change heat storage device is that the heat energy provided by a heat source is stored in a 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 consumption peak period or the electricity consumption peak period to produce hot water to supply heat to a building.
The building cooling device 13 performs heat exchange between cold water produced by the air conditioning unit and air in a building indoor room to cool the air in the indoor room, thereby achieving the purpose of cooling.
The internal combustion unit 1, the lithium bromide absorption refrigerating unit 3, the lake water source heat pump unit 4, the double-station water chilling unit 5 and other refrigerating or heating equipment in the application can respectively comprise one or more identical equipment, and if the equipment is a plurality of pieces of equipment, the equipment is output after being connected in parallel, 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 being connected in parallel is communicated with a building cooling device for cooling.
The energy supply system provided by the application further comprises a signal feedback network, which is used for monitoring the electricity utilization real-time conditions of the lithium bromide absorption refrigerating unit 3, the lake water source heat pump unit 4, the double-station water chilling unit 5 and the like and the building terminal equipment and controlling the transmission of electric quantity.
Fig. 2 is a schematic structural diagram of a regional distributed energy system and lake water source heat pump combined energy supply system for summer according to the present application.
The system comprises an internal combustion unit 1, a lithium bromide absorption refrigerating unit 3 and a lake water source heat pump unit 4, wherein the internal combustion unit 1 is used for generating electricity, the internal combustion unit 1 is used for generating electricity to supply power for an electricity utilization terminal 2, the lithium bromide absorption refrigerating unit 3 is used for absorbing waste heat of the internal combustion unit 1 to supply water for cooling and then supplying the cooled water to the building cooling equipment 13, and the lake water source heat pump unit 4 is used for refrigerating backwater of the building cooling equipment and then supplying the backwater of the building cooling equipment to the building cooling equipment 13.
The heating flue gas inlet of the lithium bromide absorption refrigerating unit 3 is connected with the heating flue gas outlet of the internal combustion unit 1, the cold water outlet of the lithium bromide absorption refrigerating unit 3 is connected with the cold water inlet of the building cooling equipment 13, the backwater of the building cooling 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 combined with the cold water outlet of the lithium bromide absorption refrigerating unit 3 and then is communicated with the cold water inlet of the building cooling equipment 13. The third backwater of the building cooling equipment 13 is communicated with a backwater inlet of the ice-making plate 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 heat exchanger 7, and the other branch of cold water outlet is connected with the cold water inlet of the ice storage device 6. The cold water outlet of the ice storage device 6 is communicated with the first cold water inlet of the first ice melting plate heat exchanger 8 and the first cold water inlet of the second ice melting plate heat exchanger 9, and the return water outlet of the first ice melting plate heat exchanger 8 and the return water outlet of the second ice melting plate heat exchanger 9 are communicated with the return water inlet of the ice storage device 6. The second cold water inlet of the first ice-melting plate heat exchanger 8 is communicated with the cold water outlet of the ice-making plate heat exchanger 7, the second cold water inlet of the second ice-melting plate heat exchanger 9 is communicated with the cold water outlet of the lithium bromide absorption refrigerating unit 3, and the cold water outlet of the first ice-melting plate heat exchanger 8 is communicated with the cold water outlet of the second ice-melting plate heat exchanger 9 and the cold water inlet of the building cooling equipment 13. The backwater outlet of the ice cold accumulation device 6 is communicated with the backwater inlet of the double-station water chilling unit 5. And a backwater outlet of the ice-making plate heat exchanger 7 is communicated with an inlet of the double-station water chilling unit 5.
The lake water inlet of the lake water source heat pump unit 4 and the double-station water chilling unit 5 are communicated with lake water, and the lake water outlet of the lake water source heat pump unit 4 and the double-station water chilling unit 5 are also communicated with lake water.
The internal combustion engine set 1 can adopt natural gas as fuel to be input into the internal combustion engine set 1 for acting and generating power. The high-temperature flue gas from the outlet of the internal combustion unit 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 double-station water chilling unit 5, so that the lake water source heat pump unit 4, the lithium bromide absorption refrigerating unit 3 and the double-station water chilling unit 5 can complementarily operate in multiple functions so as to meet the building cold requirement. During daytime, the ice cold accumulation device 6 is used for cooling preferentially, and the backwater at the user side flows through the ice making plate heat exchanger 7 for cooling and then flows through the first ice melting plate heat exchanger 8 for cooling to a set temperature for supplying to the user. The lake water source heat pump unit 4 and the lithium bromide absorption refrigerating unit 3 are started separately from the other part, and 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, and then flows through the second ice melting plate heat exchanger 9 to be cooled to a set temperature for the user. At night, the low electricity price is utilized, and the double-station water chilling unit 5 is started at full load to prepare the fluid ice. The lake water source heat pump unit 4 and the lithium bromide absorption refrigerating unit 3 provide cold energy for the building, and the shortage is provided by the ice storage device 6. Meanwhile, the power utilization of the unit and the building terminal equipment is monitored in real time through a signal feedback network, and the transmission of electric quantity is controlled.
The heat of the heating flue gas of the internal combustion unit 1 and the backwater of the lithium bromide absorption refrigerating unit exchange heat in the lithium bromide absorption refrigerating unit, so that the backwater temperature of the lithium bromide absorption refrigerating unit 3 is lower than the cold water temperature of the lithium bromide absorption refrigerating unit 3. The temperature of cold water flowing out from a cold water outlet of the lake water source heat pump unit 4 is lower than that of cold water flowing into a return water inlet, and the temperature of the cold water flowing out from the return water inlet of each device is higher than that of the cold water flowing out from the cold water outlet of each device like the double-station water chilling unit 5, the ice storage device 6, the ice making plate heat exchanger 7, the first ice melting plate heat exchanger 8 and the second ice melting plate 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 demands, and the flow rates of the lake water inlet and the lake water outlet of the double-working-condition water chilling unit 5 are also set according to actual demands. The flow rates of the lake water inlet and the lake water outlet are the same in general. The flow rate of the heating smoke flowing into the lithium bromide absorption refrigerating unit 3 by the internal combustion unit 1 is the same as that of the heating smoke sprayed out by the lithium bromide absorption refrigerating unit 3.
As shown in fig. 3, an operation schematic diagram of the regional distributed energy system and lake water source heat pump combined energy supply system provided by the application is specific to 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 backwater inlet of the waste heat boiler 11 is communicated with the backwater 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 the 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 heat exchange is performed between the smoke-water heat exchanger 10 and 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 smoke-water heat exchanger 10, and the heating flue gas outlet of the smoke-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 the waste heat of the internal combustion engine unit 1 to produce hot water and then providing the hot water for the building heat supply equipment 14, and 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 providing the reheated outlet water for 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 peak period of heat utilization or the peak period of electricity utilization.
The natural gas enters the internal combustion engine set 1 to burn, expand and do work to generate power, and is used for running the set and the building terminal equipment. The high-temperature flue gas from the internal combustion unit 1 enters the waste heat boiler 11 for heating, the flue gas from the waste heat boiler 11 enters the smoke-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 a user, the 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 requirement in the heat consumption peak period or the electricity consumption peak period, so that the waste heat utilization is maximized, and the building heat requirement in winter is met. And insufficient building heat energy is supplemented by the gas boiler 12, so that stable supply of the building heat energy is ensured, and the gas boiler 12 plays a role in heating and peak shaving of the building in winter. Meanwhile, the power utilization of the unit and the building terminal equipment is monitored in real time through a signal feedback network, and the transmission of electric quantity is controlled.
The energy supply system combining the regional distributed energy system and the lake water source heat pump provided by the application can be the same equipment as the lake water source heat pump unit 4 used in winter and summer. The cold energy, cold source, i.e. cold water, heat energy and heat source, i.e. hot water, are described in the present application. The cold quantity, cold source, heat quantity and heat source are all carriers. The connection between each unit is connected through a pipeline.
The invention has the following beneficial effects:
1. The regional distributed energy system and lake water source heat pump combined energy supply system comprehensively utilizes various renewable energy technologies such as heat energy generated by power generation of the internal combustion engine unit 1, natural gas energy, lake water and the like, and plays respective advantages by combined operation of the three energy systems, ensures the stability of energy supply of the system and greatly reduces the running cost of the system.
2. The regional distributed energy system and lake water source heat pump combined energy supply system provided by the invention fully considers the night low electricity price, utilizes the ice storage device 6 to store cold at night and release cold energy at 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 with the lake water source heat pump, the internal combustion engine unit is used for realizing high-temperature section power generation, medium-temperature section refrigeration or heating and low-temperature section waste heat reutilization, so that the energy is utilized step by step for multiple times, the performance efficiency of the whole internal combustion engine unit is further improved, and the cascade 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, provided by the invention, the 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 further improved by improving the water outlet temperature of the lake water source heat pump unit 4.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.