Device for comprehensively recycling heat

Abstract

The heat comprehensive recycling device comprises a heat pump system, high-power heating equipment, a heat exchanger, a heat preservation water tank, a fourth circulating pump and a waste heat recoverer, the heat pump system is a loop composed of a compressor, a condenser, a throttling valve and an evaporator which are sequentially connected, and refrigerating fluid flows in the loop; the condenser and the waste heat recoverer form a loop through a fourth circulating pump, and hot water flows in the loop; the outlet end of the evaporator, the high-power heating equipment, the heat exchanger, the heat preservation water tank and the inlet end of the evaporator form a loop, cooling water flows in the loop, absorbs heat emitted by the high-power heating equipment and the heat exchanger, continues to heat the cooling water through the heat preservation water tank and then enters the evaporator, and the heat is dissipated through the heat preservation water tank. A resistance wire is arranged on the outer wall of the heat preservation water tank and is heated by electric energy of a photovoltaic power generation system.

Description

Technical Field

[0001] The utility model belongs to the technical field of public equipment, specifically to the technical field of comprehensive energy utilization, and in particular to a device for comprehensive heat recovery and utilization that is applied to the integrated operation of a cooling system, a boiler sewage system, new energy, and a waste heat recovery system to improve energy utilization efficiency. Background Art

[0002] At present, the common waste heat recovery system uses heat pump technology to convert waste heat into steam. The waste heat utilization system includes warm water generated by waste heat, exhaust steam, heat pump, steam compressor, high-temperature circulating water pump, throttle valve, pipeline, flash tank, controller, human-machine interface, etc.

[0003] At present, the common waste heat recovery system is to recover the heat of warm water to the high-temperature water system or steam system through a heat pump. The heat pump system exchanges the heat of warm water to the refrigerant through the evaporator, and the refrigerant is compressed into high-temperature gas through the compressor, and the heat is exchanged to the high-temperature water through the condenser. The steam is separated through the flash tank, pressurized by the steam compressor, and sent to the steam network for use.

[0004] Factories have cooling systems that generate a lot of waste heat when cooling high-power equipment or cooling equipment in high-temperature environments, such as air compressors, refrigerators, vacuum dehumidification systems, etc. In actual production, independent cooling systems are usually established for specific equipment or workshops, such as open / closed cooling towers, to exchange heat into the atmosphere, resulting in a large amount of heat loss.

[0005] The boiler blowdown system is divided into continuous blowdown and periodic blowdown. The blowdown rate of industrial boilers is about 3%, and some are even higher, reaching 5%. Continuous blowdown is discharged through an expander after heat exchange in a soft water heat exchanger. Periodic blowdown is discharged after passing through an expander. The blowdown is expanded after pressure reduction to produce flash steam and high-temperature water (close to boiling point), causing a large amount of heat loss.

[0006] For areas with good sunshine, solar energy resources are very important and potential energy. Photovoltaic power generation usually adopts the strategy of self-use and grid connection of surplus power. How to fully utilize the generated electricity, avoid adding surplus power grid connection links, and reduce equipment and management costs requires comprehensive consideration based on the existing equipment situation.

[0007] In summary, there is a lot of potential to be tapped in factory waste heat recovery. It is necessary to recycle various heat sources and expand the potential for heat supplementation, such as solar energy and wind energy. For cigarette factories, there is a lot of room for improvement in the overall utilization of heat. Summary of the invention

[0008] The purpose of this application is to provide a device for comprehensive heat recovery and utilization in view of the deficiencies in the prior art.

[0009] In order to achieve the purpose of this application, this application adopts the following technical solutions:

[0010] The utility model discloses a device for comprehensive heat recovery and utilization, which comprises: a heat pump system, a high-power heating device, a heat exchanger, a heat-insulating water tank, a fourth circulation pump and a waste heat recovery device. The heat pump system is composed of a loop composed of a compressor, a condenser, a throttle valve and an evaporator connected in sequence, in which a refrigerant flows; the condenser forms a loop with the waste heat recovery device through the fourth circulation pump, in which hot water flows; wherein: the outlet end of the evaporator, the high-power heating device, the heat exchanger, the heat-insulating water tank and the inlet end of the evaporator form a loop, in which cooling water flows, the cooling water absorbs the heat emitted from the high-power heating device and the heat exchanger, the cooling water is continuously heated by the heat-insulating water tank, and then enters the evaporator, a resistance wire is installed on the outer wall of the heat-insulating water tank, and the resistance wire is heated by the electric energy of the photovoltaic power generation system.

[0011] The utility model discloses a device for comprehensive heat recovery and utilization, wherein: the photovoltaic power generation system comprises: a photovoltaic array, an inverter, a controller and a grid-connected cabinet connected in sequence, the resistance wire of the thermal insulation water tank is connected to the controller, when the electric energy generated by the photovoltaic power generation system is not sent to the grid-connected cabinet, the electric energy generated by the photovoltaic power generation system is sent to the thermal insulation water tank through the controller and communicated with the resistance wire on the outer wall of the thermal insulation water tank.

[0012] The utility model discloses a device for comprehensive heat recovery and utilization, wherein: the device for comprehensive heat recovery and utilization also includes: a first buffer water tank and a second buffer water tank, and the second buffer water tank and the first buffer water tank are respectively installed at the inlet end and the outlet end of the high-power heating equipment.

[0013] The utility model discloses a device for comprehensive heat recovery and utilization, wherein: the device for comprehensive heat recovery and utilization also includes: a first circulation pump, a second circulation pump and a third circulation pump, the first circulation pump is installed on the pipeline between the second buffer water tank and the high-power heating equipment, the second circulation pump is installed on the pipeline between the first buffer water tank and the heat exchanger, and the third circulation pump is installed on the pipeline between the insulation water tank and the evaporator.

[0014] The utility model provides a device for comprehensive heat recovery and utilization, wherein: the high-power heating equipment is an air compressor or a refrigerator.

[0015] The utility model discloses a device for comprehensive heat recovery and utilization, wherein: the heat exchanger exchanges heat with high-temperature water from continuous or / and periodic sewage discharge of a boiler.

[0016] The utility model provides a device for comprehensive heat recovery and utilization, wherein: the heat exchanger exchanges heat with condensed water and / or sewage discharged from thermal equipment.

[0017] The utility model is a device for comprehensive heat recovery and utilization. Through in-depth analysis of the factory equipment cooling system, boiler blowdown system, new energy system and other waste heat systems, the heat balance relationship of the heat recycling process is evaluated, and the heat recovery and utilization system is constructed into an integrated system to achieve comprehensive energy recovery and utilization, thereby improving the overall system efficiency. The system uses cooling water as a medium to recover energy such as equipment cooling, boiler blowdown, and new energy surplus electricity, and forms a heat recovery and utilization system with a heat pump, recovering waste heat and surplus energy into high-temperature water vapor, achieving efficient heat utilization, and reducing the use of high-quality steam produced by the boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a basic system structure diagram of a heat comprehensive recovery and utilization technology of the utility model.

[0019] exist Figure 1 Among them, label 1 is a photovoltaic power generation system; label 2 is a heat pump system; label 3 is a high-power heating device; label 4 is a heat exchanger; label 5 is an insulated water tank; label 6 is a first buffer water tank; label 7 is a second buffer water tank; label 8 is a first circulation pump; label 9 is a second circulation pump; label 10 is a third circulation pump; label 11 is a photovoltaic array; label 12 is an inverter; label 13 is a controller; label 14 is a grid-connected cabinet; label 21 is a compressor; label 22 is a condenser; label 23 is an evaporator; label 24 is a throttle valve; label 31 is a fourth circulation pump; label 32 is a waste heat recovery device; label 33 is a resistance wire. DETAILED DESCRIPTION

[0020] like Figure 1 As shown, the device for comprehensive heat recovery and utilization of the utility model includes: a heat pump system 2, a high-power heating device 3, a heat exchanger 4, an insulated water tank 5, a first buffer water tank 6, a second buffer water tank 7, a first circulating pump 8, a second circulating pump 9, a third circulating pump 10, a fourth circulating pump 31 and a waste heat recovery device 32. The heat pump system 2 is composed of a compressor 21, a condenser 22, a throttle valve 24 and an evaporator 23 connected in sequence to form a loop, in which a refrigerant flows; the condenser 22 forms a loop with the waste heat recovery device 32 through the fourth circulating pump 31, and hot water flows in the loop.

[0021] The outlet end of the evaporator 23, the second buffer water tank 7, the first circulation pump 8, the high-power heating device 3, the first buffer water tank 6, the second circulation pump 9, the heat exchanger 4, the insulation water tank 5, the third circulation pump 10 and the inlet end of the evaporator 23 form a loop, in which cooling water flows. After the cooling water absorbs the heat emitted from the high-power heating device 3 and the heat exchanger 4, the insulation water tank 5 continues to heat the cooling water, and then enters the evaporator 23. A resistance wire 33 is installed on the outer wall of the insulation water tank 5, and the resistance wire 33 is heated by the electric energy of the photovoltaic power generation system 1. The photovoltaic power generation system 1 includes: a photovoltaic array 11, an inverter 12, a controller 13 and a grid-connected cabinet 14 connected in sequence. The resistance wire 33 of the insulation water tank 5 is connected to the controller 13. When the electric energy generated by the photovoltaic power generation system 1 is not sent to the grid-connected cabinet, the electric energy generated by the photovoltaic power generation system 1 is sent to the insulation water tank 5 through the controller 13 and communicates with the resistance wire 33 on the outer wall of the insulation water tank 5.

[0022] The high-power heating device 3 is an air compressor or a refrigerator. The heat exchanger 4 exchanges heat with high-temperature water from continuous or periodic blowdown of the boiler; or with condensed water or / and blowdown water discharged from thermal equipment.

[0023] The control process of the comprehensive heat recovery and utilization technology in this embodiment is as follows:

[0024] The utility model's device for comprehensive heat recovery and utilization uses cooling water as a medium to construct a closed cooling water circulation system; the equipment cooling and boiler blowdown (waste heat) heat exchange are connected in series to the pipe network system; the new energy (photovoltaic power generation) electric heating is connected in series to the insulated water tank; the system recovers energy such as equipment cooling, boiler blowdown, and new energy surplus electricity, and forms a heat recovery and utilization system with a heat pump, recovering waste heat and surplus energy into high-temperature water (steam) to achieve efficient heat utilization, while reducing the use of high-quality steam produced by the boiler. For non-production periods such as weekends and holidays, the new energy (photovoltaic power generation) switching control is used to heat the circulating cooling water, and the cooling water with increased temperature is stored in the insulated water tank and the pipe network system. The surplus electricity is converted into hot water heat storage to avoid the surplus electricity being connected to the Internet. When production is in progress, it directly provides a heat source for the heat pump, effectively utilizing the photovoltaic power generation during the non-production period. The system achieves an overall improvement in energy utilization efficiency.

[0025] The process flow of the device for comprehensive heat recovery and utilization of the utility model is as follows:

[0026] (1) Using cooling water as a medium, a closed cooling water circulation system is constructed to connect the cooling of high-power heating equipment 4 and the heat exchange of boiler sewage (waste heat) in series to the pipe network system, and the new energy (photovoltaic power generation) electric heating in series to the insulation water tank 5.

[0027] (2) Heat exchange is divided into two stages. The heat exchange temperature of the high-power heating equipment 4 is relatively low, which is the first stage of heat exchange. The temperature of the discharged waste heat (such as waste water from thermal equipment) is relatively high, which is the second stage of heat exchange in the heat exchanger 4. The circulating cooling water from the second buffer water tank 7 first cools the high-power equipment and absorbs the waste heat. This process is the first stage of heat exchange; after the temperature is increased, it enters the heat exchanger 4 and exchanges heat with the discharged waste heat (drainage, condensed water, boiler and heat accumulator waste water, etc.). This process is the second stage of heat exchange. After the temperature is increased, it enters the insulation water tank 5.

[0028] (3) The heat exchanger 4 for heat exchange between cooling water and exhaust heat can be divided into multiple stages, generally divided into two stages (low temperature and high temperature). The boiler wastewater (continuous discharge and fixed discharge) is collected and enters the heat exchanger after the expander. Low-quality condensate, drain, heat accumulator and deaerator tank wastewater are uniformly recovered in the water collection tank of this heat exchanger. Due to the poor quality of waste hot water, it is directly discharged into the sewage system after multi-stage heat exchange in the heat exchanger. This subsystem mainly recycles various heat sources with poor water quality.

[0029] (4) Connect the electric heating of new energy (photovoltaic power generation as an example) in series to the insulated water tank 5. The control of the photovoltaic power generation system 1 is divided into two paths. One path is to directly connect the electricity to the grid cabinet 14 for production during normal production; the other path is to use the electricity for electric heating in the resistance wire 33 of the insulated water tank 5, and to heat the circulating water during non-production. The surplus electricity is effectively converted into the heat of hot water and stored, avoiding the surplus electricity from being connected to the grid, saving equipment and management costs. When waiting for production, the cooling water with increased temperature directly becomes the hot water source of the heat pump.

[0030] (5) The cooling water in the insulated water tank 5 enters the heat pump system, passes through the evaporator 23, performs heat exchange, and the temperature of the cooling water is reduced. The heat enters the heat pump system 2 from the cooling water. The refrigerant in the heat pump system 2 passes through the condenser 22, performs heat exchange, and exchanges the heat to the water in the high-temperature water circulation system of the waste heat recovery device 32.

[0031] (6) The cooled cooling water enters the second buffer water tank 7 for the next water cycle. The system realizes the integrated management of factory equipment cooling waste heat, exhaust waste heat, photovoltaic surplus power energy storage, etc., and fully recycles and utilizes heat, improves the overall energy utilization efficiency of the factory, and reduces the comprehensive energy consumption of the factory.

[0032] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for comprehensive heat recovery and utilization, comprising: A heat pump system (2), a high-power heating device (3), a heat exchanger (4), an insulated water tank (5), a fourth circulating pump (31) and a waste heat recovery device (32), wherein the heat pump system (2) is composed of a loop consisting of a compressor (21), a condenser (22), a throttle valve (24) and an evaporator (23) connected in sequence, wherein a refrigerant flows in the loop; the condenser (22) forms a loop with the waste heat recovery device (32) through the fourth circulating pump (31), wherein hot water flows in the loop; and the evaporator (23) is characterized in that: The outlet end of the high-power heating device (3), the heat exchanger (4), the heat preservation water tank (5) and the inlet end of the evaporator (23) form a loop, in which cooling water flows. The cooling water absorbs the heat emitted from the high-power heating device (3) and the heat exchanger (4), and is further heated by the heat preservation water tank (5) before entering the evaporator (23). A resistance wire (33) is installed on the outer wall of the heat preservation water tank (5), and the resistance wire (33) is heated by the electric energy of the photovoltaic power generation system (1).

2. The device for comprehensive heat recovery and utilization according to claim 1, characterized in that: The photovoltaic power generation system (1) comprises: a photovoltaic array (11), an inverter (12), a controller (13) and a grid-connected cabinet (14) connected in sequence; a resistance wire (33) of a heat-insulating water tank (5) is connected to the controller (13); when the electric energy generated by the photovoltaic power generation system (1) is not sent to the grid-connected cabinet, the electric energy generated by the photovoltaic power generation system (1) is sent to the heat-insulating water tank (5) through the controller (13) and communicates with the resistance wire (33) on the outer wall of the heat-insulating water tank (5).

3. The device for comprehensive heat recovery and utilization according to claim 2, characterized in that: The device for comprehensive heat recovery and utilization also includes: a first buffer water tank (6) and a second buffer water tank (7), wherein the second buffer water tank (7) and the first buffer water tank (6) are respectively installed at the inlet and outlet ends of the high-power heating device (3).

4. The device for comprehensive heat recovery and utilization according to claim 3, characterized in that: The device for comprehensive heat recovery and utilization also includes: a first circulation pump (8), a second circulation pump (9) and a third circulation pump (10), wherein the first circulation pump (8) is installed on the pipeline between the second buffer water tank (7) and the high-power heating device (3), the second circulation pump (9) is installed on the pipeline between the first buffer water tank (6) and the heat exchanger (4), and the third circulation pump (10) is installed on the pipeline between the insulation water tank (5) and the evaporator (23).

5. The device for comprehensive heat recovery and utilization according to claim 4, characterized in that: The high-power heating device (3) is an air compressor or a refrigerator.

6. The device for comprehensive heat recovery and utilization according to claim 5, characterized in that: The heat exchanger (4) exchanges heat with high-temperature water from continuous or / and periodic blowdown of the boiler.

7. The device for comprehensive heat recovery and utilization according to claim 5, characterized in that: The heat exchanger (4) exchanges heat with condensed water and / or waste water discharged from thermal equipment.

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