Tandem composite system for waste heat multi-stage utilization

Abstract

The utility model discloses a series composite system for waste heat multi-stage utilization. The series composite system comprises a first heat pump circulating system, a second heat pump circulating system, a waste heat recovery heat exchanger, a heat storage water tank and a solar vacuum heat collector. The waste heat recovery heat exchanger is connected with an evaporator of the first heat pump circulation system, the evaporator is connected with the heat storage water tank, the heat storage water tank is in circulation connection with the solar vacuum heat collector, and the heat storage water tank is connected with an evaporator of the second heat pump circulation system. The waste heat recovery device has the advantages that waste heat recovery efficiency can be remarkably improved, energy consumption and carbon emission are reduced, and the waste heat recovery device has remarkable environmental and economic benefits.

Description

Technical Field

[0001] This utility model relates to the field of energy recovery and utilization technology, and in particular to a series composite system for multi-stage utilization of waste heat. Background Technology

[0002] With the acceleration of industrialization, energy consumption is increasing day by day, especially the large amount of waste heat generated in industrial production processes that has not been effectively utilized, resulting in a huge waste of energy. At present, waste heat recovery technology mainly focuses on single-stage heat exchange, which often can only recover a portion of the heat and is not very efficient.

[0003] Existing waste heat recovery systems mostly use simple heat exchangers, such as shell-and-tube heat exchangers. These systems typically only achieve single-stage heat exchange and cannot realize the effective utilization of multi-stage waste heat. For example, a waste heat boiler developed by a certain company can recover some waste heat, but it is limited to single-stage heat exchange and fails to achieve multi-stage utilization of waste heat.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The technical problem to be solved by this utility model is: how to solve the problem that the current waste heat recovery and utilization can only recover part of the waste heat and cannot realize the effective utilization of multi-stage waste heat.

[0006] This utility model solves the above-mentioned technical problems through the following technical means:

[0007] A series composite system for multi-stage utilization of waste heat includes a first heat pump cycle system, a second heat pump cycle system, a waste heat recovery heat exchanger, a hot water storage tank, and a solar vacuum collector.

[0008] The waste heat recovery heat exchanger is connected to the evaporator of the first heat pump cycle system, the evaporator is connected to the hot water storage tank, the hot water storage tank is cyclically connected to the solar vacuum collector, and the hot water storage tank is connected to the evaporator of the second heat pump cycle system.

[0009] In this invention, wastewater absorbs heat from waste gas in a waste heat recovery heat exchanger, then transfers the heat to the refrigerant in the evaporator of the first heat cycle system, and finally enters a hot water storage tank. The water in the tank is then sent to a solar vacuum collector to absorb solar heat, which circulates and heats the water in the tank. The heated water then enters the evaporator of the second heat pump cycle system, achieving efficient waste heat recovery. This invention employs a tiered energy and secondary utilization method to efficiently utilize waste heat; it uses solar energy to raise the temperature of the used waste heat source, improving secondary utilization efficiency; and it couples the waste heat from waste gas and wastewater for utilization. This significantly improves waste heat recovery efficiency, reduces energy consumption and carbon emissions, and has significant environmental and economic benefits.

[0010] Preferably, the first heat pump cycle system is the same as the second heat pump cycle system, both including a compressor, condenser, expansion valve, evaporator and gas-liquid separator connected in a cycle.

[0011] Preferably, the system further includes a hose and a one-way valve, the hose and the one-way valve being connected between the compressor and the gas-liquid separator, and the hose and the one-way valve being connected between the compressor and the condenser.

[0012] Preferably, the first end of the waste heat recovery heat exchanger is a wastewater inlet, the second end is connected to the evaporator of the first heat pump cycle system, the third end of the waste heat recovery heat exchanger is a waste gas inlet, and the fourth end is a waste gas outlet.

[0013] Preferably, the waste heat recovery heat exchanger is connected to the evaporator in the first heat pump cycle system via a first water pump.

[0014] Preferably, the second heat pump cycle system is also connected to a water storage tank.

[0015] Preferably, the water storage tank is connected to a drain valve.

[0016] Preferably, it also includes a second water pump and a water valve, with the water pump and water valve connected to the pipeline between the hot water storage tank and the solar vacuum collector.

[0017] Preferably, a third water pump is connected between the hot water storage tank and the evaporator of the second heat pump cycle system.

[0018] Preferably, an exhaust valve is connected to the hot water storage tank.

[0019] The advantages of this utility model are:

[0020] In this invention, wastewater absorbs heat from waste gas in a waste heat recovery heat exchanger, then transfers the heat to the refrigerant in the evaporator of the first heat cycle system, and finally enters a hot water storage tank. The water in the tank is then sent to a solar vacuum collector to absorb solar heat, which circulates and heats the water in the tank. The heated water then enters the evaporator of the second heat pump cycle system, achieving efficient waste heat recovery. This invention employs a tiered energy and secondary utilization method to efficiently utilize waste heat; it uses solar energy to raise the temperature of the used waste heat source, improving secondary utilization efficiency; and it couples the waste heat from waste gas and wastewater for utilization. This significantly improves waste heat recovery efficiency, reduces energy consumption and carbon emissions, and has significant environmental and economic benefits. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the series composite system for multi-stage utilization of waste heat according to an embodiment of this utility model;

[0022] Numbering on the map:

[0023] 1. First heat pump cycle system; 11. Compressor; 12. Condenser; 13. Expansion valve; 14. First evaporator; 15. Gas-liquid separator; 16. Hose; 17. Check valve; 2. Second heat pump cycle system; 24. Second evaporator; 3. Waste heat recovery heat exchanger; 31. First water pump; 4. Hot water storage tank; 41. Exhaust valve; 42. Third water pump; 5. Solar vacuum collector; 51. Second water pump; 6. Water storage tank; 61. Drain valve. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] Example 1:

[0026] like Figure 1 As shown, the series composite system for multi-stage utilization of waste heat includes a first heat pump cycle system 1, a second heat pump cycle system 2, a waste heat recovery heat exchanger 3, a hot water storage tank 4, and a solar vacuum collector 5; the waste heat recovery heat exchanger 3 is connected to the evaporator of the first heat pump cycle system 1, the evaporator is connected to the hot water storage tank 4, the hot water storage tank 4 is cyclically connected to the solar vacuum collector 5, and the hot water storage tank 4 is connected to the evaporator of the second heat pump cycle system 2.

[0027] In this embodiment, the first heat pump cycle system 1 and the second heat pump cycle system 2 are the same, meaning they have the same components and the same connection method. The first heat pump cycle system 1 will be used for explanation here. For distinction, the evaporator of the first heat pump cycle system 1 is designated as the first evaporator 14, and the evaporator of the second heat pump cycle system 2 is designated as the second evaporator 24.

[0028] The first heat pump cycle system 1 includes a compressor 11, a condenser 12, an expansion valve 13, a first evaporator 14, and a gas-liquid separator 15, which are connected in a cycle. It also includes a hose 16 and a one-way valve 17, the hose 16 and the one-way valve 17 connecting the compressor 11 and the gas-liquid separator 15, and the hose 16 and the one-way valve 17 connecting the compressor 11 and the condenser 12.

[0029] Heat pump cycle: The refrigerant is compressed in compressor 11, increasing its pressure and temperature, turning it into high-temperature, high-pressure vapor. The compressed high-temperature, high-pressure refrigerant vapor is discharged and sent to condenser 12. In condenser 12, the refrigerant vapor releases heat, its temperature drops, and it condenses. The refrigerant passes through expansion valve 13, its pressure decreases, and some of the refrigerant flashes into low-pressure vapor, forming a gas-liquid mixture. This refrigerant gas-liquid mixture absorbs heat from the cooled medium (water) in the first evaporator 14 and evaporates into vapor. Gas-liquid separator 15 uses gravity or centrifugal force to separate the liquid refrigerant and vapor; the vapor returns to compressor 11 to complete the cycle.

[0030] Hose 16 can be used to buffer the transmission pressure and facilitate the layout of various parts.

[0031] One-way valve 17 is used to control the conveying direction of the enterprise.

[0032] like Figure 1 As shown, the first end of the waste heat recovery heat exchanger 3 is a wastewater inlet, the second end is connected to the first evaporator 14 of the first heat pump cycle system 1, the third end of the waste heat recovery heat exchanger 3 is a waste gas inlet, and the fourth end is a waste gas outlet. A first water pump 31 is connected between the waste heat recovery heat exchanger 3 and the first evaporator 14.

[0033] The second evaporator 24 of the second heat pump cycle system 2 is connected to the water storage tank 6. The water storage tank 6 is connected to the drain valve 61. The water storage tank 6 stores water for the second evaporator 24.

[0034] A second water pump 51 and a water valve 52 are connected to the pipe between the hot water storage tank 4 and the solar vacuum collector 5. An exhaust valve 41 is connected to the hot water storage tank 4. A third water pump 42 is connected between the hot water storage tank 4 and the second evaporator 24 of the second heat pump circulation system 2.

[0035] Waste heat recovery: Wastewater absorbs heat from the exhaust gas in the waste heat recovery heat exchanger 3, then transfers the heat to the refrigerant through the first evaporator 14, and then enters the hot water storage tank 4. The water in the hot water storage tank 4 is pumped to the solar vacuum collector 5 by the second water pump 51 to absorb solar heat. The solar vacuum collector 5 is used to circulate and heat the water in the hot water storage tank 4. The water with increased heat then enters the second evaporator 24 of the second heat pump circulation system 2, achieving efficient waste heat recovery.

[0036] This embodiment adopts a tiered energy and secondary utilization method to efficiently utilize waste heat; it uses solar energy to raise the temperature of the used waste heat source, thereby improving the secondary utilization efficiency; it couples the waste heat from exhaust gas with the waste heat from wastewater; it can significantly improve the waste heat recovery efficiency, reduce energy consumption and carbon emissions, and has significant environmental and economic benefits.

[0037] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A series composite system for multi-stage utilization of waste heat, characterized in that, It includes a first heat pump cycle system, a second heat pump cycle system, a waste heat recovery heat exchanger, a hot water storage tank, and a solar vacuum collector; The waste heat recovery heat exchanger is connected to the evaporator of the first heat pump cycle system, the evaporator is connected to the hot water storage tank, the hot water storage tank is cyclically connected to the solar vacuum collector, and the hot water storage tank is connected to the evaporator of the second heat pump cycle system.

2. The series composite system for multi-stage waste heat utilization according to claim 1, characterized in that, The first heat pump cycle system is the same as the second heat pump cycle system, both including a compressor, condenser, expansion valve, evaporator and gas-liquid separator connected in a cycle.

3. The series composite system for multi-stage waste heat utilization according to claim 2, characterized in that, It also includes a hose and a one-way valve, the hose and the one-way valve being connected between the compressor and the gas-liquid separator, and the hose and the one-way valve being connected between the compressor and the condenser.

4. The series composite system for multi-stage waste heat utilization according to claim 1, characterized in that, The first end of the waste heat recovery heat exchanger is a wastewater inlet, the second end is connected to the evaporator of the first heat pump cycle system, the third end of the waste heat recovery heat exchanger is a waste gas inlet, and the fourth end is a waste gas outlet.

5. The series composite system for multi-stage utilization of waste heat according to claim 1, characterized in that, The waste heat recovery heat exchanger is connected to the evaporator in the first heat pump cycle system via a first water pump.

6. The series composite system for multi-stage utilization of waste heat according to claim 1, characterized in that, The second heat pump cycle system is also connected to a water storage tank.

7. The series composite system for multi-stage waste heat utilization according to claim 6, characterized in that, The water storage tank is connected to a drain valve.

8. The series composite system for multi-stage waste heat utilization according to claim 1, characterized in that, It also includes a second water pump and a water valve, with the second water pump and water valve connected to the pipeline between the hot water storage tank and the solar vacuum collector.

9. The series composite system for multi-stage waste heat utilization according to claim 1, characterized in that, A third water pump is connected between the hot water storage tank and the evaporator of the second heat pump cycle system.

10. The series composite system for multi-stage waste heat utilization according to claim 1, characterized in that, An exhaust valve is connected to the hot water storage tank.

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