Waste heat recovery system

Abstract

The utility model discloses a waste heat recovery system. The waste heat recovery system comprises a screw air compressor, a heat exchange device and a water source heat pump. The output end of the screw air compressor is connected with the first input end of the heat exchange device, the first output end of the heat exchange device is connected with the first input end of the water source heat pump, and the first output end of the water source heat pump outputs liquid at the first preset temperature. According to the waste heat recovery system, low-grade waste heat resources of the screw air compressor are effectively utilized, the temperature of the liquid flowing out of the heat exchange device can be increased through the water source heat pump so that the liquid at the first preset temperature can be output, then an industrial gas water heater can be replaced, energy consumption is reduced, and cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, in particular to a waste heat recovery system. Background Art

[0002] At present, due to production needs, the home appliance industry needs to pre-treat the body shell before painting. The pre-treatment is mainly to remove the oil attached to the iron shell to obtain a completely clean metal surface. The pre-treatment needs to be carried out in a cleaning liquid at 80°C. As the workpiece enters and exits the cleaning tank, the water temperature of the tank decreases, and the temperature decrease affects the pre-treatment effect. Therefore, the cleaning liquid needs to be heated. The commonly used method is to use a gas water heater to heat the cleaning liquid. Using a gas water heater to heat the cleaning liquid has the disadvantages of high energy consumption, difficult temperature control, safety hazards, cleanliness problems, and high maintenance costs. Utility Model Content

[0003] In view of this, the utility model aims to solve one of the problems in the related art at least to a certain extent. To this end, the purpose of the utility model is to provide a waste heat recovery system.

[0004] The present application provides a waste heat recovery system. The waste heat recovery system includes a screw air compressor, a heat exchange device and a water source heat pump, wherein the output end of the screw air compressor is connected to the first input end of the heat exchange device, the first output end of the heat exchange device is connected to the first input end of the water source heat pump, and the first output end of the water source heat pump outputs a liquid at a first preset temperature.

[0005] In certain embodiments, the second input end of the water source heat pump can input a liquid of a second preset temperature, the second output end of the water source heat pump is connected to the second input end of the heat exchange device, and the second output end of the heat exchange device is connected to the screw air compressor to provide coolant for the screw air compressor.

[0006] In certain embodiments, the first preset temperature ranges from 75°C to 85°C.

[0007] In certain embodiments, the water source heat pump includes an evaporator, and the output end of the heat exchange device is connected to the input end of the evaporator.

[0008] In certain embodiments, the waste heat recovery system further includes a liquid application device, and the first output end of the water source heat pump is connected to the input end of the liquid application device to provide the liquid with the first preset temperature to the liquid application device.

[0009] In certain embodiments, the liquid application device includes a water separator and a cleaning tank, the first output end of the water source heat pump is connected to the input end of the water separator, and the output end of the water separator is connected to the input end of the cleaning tank.

[0010] In some embodiments, the number of the cleaning tank is at least one.

[0011] In some embodiments, the output end of the liquid application device is connected to the second input end of the water source heat pump, the second output end of the water source heat pump is connected to the second input end of the heat exchange device, and the second output end of the heat exchange device is connected to the input end of the screw air compressor, forming a waste heat recovery cycle.

[0012] In some embodiments, the liquid application device also includes a circulating water pump and a water collector, the output end of the water divider is connected to the input end of the circulating water pump, the output end of the circulating water pump is connected to the input end of the cleaning tank, the output end of the cleaning tank is connected to the input end of the water collector, and the output end of the water collector is connected to the second input end of the water source heat pump.

[0013] In some embodiments, the number of the circulating water pumps corresponds to the number of the cleaning tanks.

[0014] In this way, the waste heat recovery system of the present application effectively utilizes the low-grade waste heat resources of the screw air compressor. The water source heat pump can increase the temperature of the liquid flowing out of the heat exchange device to output liquid at a first preset temperature, thereby replacing the industrial gas water heater, saving energy consumption and reducing costs.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0017] Figure 1 It is one of the structural schematic diagrams of the waste heat recovery system of the implementation mode of the present application;

[0018] Figure 2 This is the second structural schematic diagram of the waste heat recovery system according to the implementation mode of the present application;

[0019] Figure 3 This is the third structural schematic diagram of the waste heat recovery system according to the implementation mode of the present application;

[0020] Figure 4 This is the fourth structural schematic diagram of the waste heat recovery system of the implementation mode of the present application.

[0021] Main component reference numbers:

[0022] Waste heat recovery system 100;

[0023] Screw air compressor 10, input end 11 of screw air compressor, output end 12 of screw air compressor; heat exchange device 20, first input end 21 of heat exchange device, first output end 22 of heat exchange device, second input end 23 of heat exchange device, second output end 24 of heat exchange device; water source heat pump 30, first input end 31 of water source heat pump, first output end 32 of water source heat pump, second input end 33 of water source heat pump, second output end 34 of water source heat pump; liquid application device 40, input end 41 of liquid application device; water separator 50, input end 51 of water separator, output end 52 of water separator; cleaning tank 60, input end 61 of cleaning tank, output end 62 of cleaning tank; circulating water pump 70, input end 71 of circulating water pump, output end 72 of circulating water pump; water collector 80, input end 81 of water collector, output end 82 of water collector. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, and may refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection, or mutual communication; direct connection, indirect connection through an intermediate medium, internal connection between two elements, or interaction between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] See also Figure 1 The present application discloses a waste heat recovery system 100. The waste heat recovery system 100 includes a screw air compressor 10, a heat exchange device 20, and a water source heat pump 30. The output end 12 of the screw air compressor 10 is connected to the first input end 21 of the heat exchange device 20, the first output end 22 of the heat exchange device 20 is connected to the first input end 31 of the water source heat pump 30, and the first output end 32 of the water source heat pump 30 outputs a liquid at a first preset temperature.

[0030] Specifically, the screw air compressor 10 is a screw air compressor, which is a popular air supply device. When working, it converts electrical energy into mechanical energy, and the mechanical energy into high-pressure compressed air. The high-speed rotation of the air compressor screw generates a large amount of heat, which is carried out of the body through the lubricating oil and dissipated in the form of air cooling or water cooling, wasting a lot of heat energy. In view of this, the present application can recover the waste heat of the screw air compressor 10 through the waste heat recovery system 100.

[0031] The heat exchange device 20 transfers heat energy by heat conduction. The heat in the waste heat of the screw air compressor 10 is transferred to the liquid in the heat exchange device 20 by heat conduction. After the liquid absorbs the heat, the temperature rises, thereby recovering the waste heat of the screw air compressor 10.

[0032] The working mechanism of the water source heat pump 30 is to utilize the low-grade thermal energy resources formed by the solar energy and geothermal energy absorbed by the shallow water sources on the earth's surface, such as groundwater, rivers and lakes, and adopt the heat pump principle to realize the transfer of low-grade thermal energy to high-grade thermal energy through a small amount of high-grade electric energy input.

[0033] In one embodiment, the lubricating oil temperature at the output end 12 of the screw air compressor 10 is 65°C, and the liquid at 50°C is output after the heat exchange of the heat exchange device 20. The liquid flows from the first output end 22 of the heat exchange device 20 into the first input end 31 of the water source heat pump 30. After the liquid is heated to 80°C by the water source heat pump 30, the 80°C liquid is output from the first output end 32 of the water source heat pump 30.

[0034] In this way, the waste heat recovery system 100 of the present application effectively utilizes the low-grade waste heat resources of the screw air compressor 10, and can obtain liquid of the first preset temperature by further increasing the temperature through the water source heat pump 30, thereby replacing the industrial gas water heater, saving energy consumption and reducing costs.

[0035] It can be understood that the first preset temperature of the present application is related to the application scenario. For the application scenario of heating the cleaning liquid of the present application, the temperature range of the first preset temperature can be 75 to 85°C.

[0036] Specifically, for example, the first preset temperature can be 75°C, 76°C, 77°C, 78°C, 79°C, 80°C, 81°C, 82°C, 83°C, 84°C or 85°C, without limitation herein.

[0037] It is understandable that the temperature of the cleaning liquid in the pretreatment process of the metal shell of the electrical appliance is crucial to the cleaning effect. The ideal temperature range is 75°C to 85°C. If the temperature control is inaccurate and the actual temperature is outside the ideal temperature range, it may affect the cleaning effect or cause waste of the cleaning liquid. Therefore, the liquid with the first preset temperature output by the waste heat recovery system 100 of the present application can be used as the cleaning liquid in the pretreatment process of the metal shell of the electrical appliance, which can ensure a good cleaning effect and avoid waste of cleaning liquid.

[0038] In this way, the waste heat recovery system of the present application can provide a cleaning liquid maintained within a first preset temperature range, thereby ensuring a good cleaning effect and avoiding waste of the cleaning liquid.

[0039] In addition to being used as a waste heat recovery device for the screw air compressor 10 , the waste heat recovery system 100 of the present application can also be used to replace the cooling tower of the screw air compressor 10 .

[0040] Specifically, see Figure 2 In certain embodiments of the present application, the second input end 33 of the water source heat pump 30 can input liquid of a second preset temperature, the second output end 34 of the water source heat pump 30 is connected to the second input end 23 of the heat exchange device 20, and the second output end 24 of the heat exchange device 20 is connected to the screw air compressor 10 to provide coolant for the screw air compressor 10.

[0041] It can be understood that the water source heat pump 30 is composed of an evaporator, a compressor, a condenser, a throttle valve, etc. Among them, the evaporator is a heat source, the condenser is a cooling source, and the compressor is an energy converter. The water source heat pump 30 has multiple uses, which can heat the water source and cool it.

[0042] In one embodiment, the temperature of the liquid recovered after cleaning with the cleaning liquid is a second preset temperature, and at this time, the second preset temperature is a temperature lower than 80°C, for example, about 60°C. After the recovered liquid flows into the second input end 33 of the water source heat pump 30, the condenser of the water source heat pump 30 plays a cooling role, and the temperature of the liquid flowing out of the water source heat pump 30 can drop to 32°C, and then flows out from the output end 34 of the water source heat pump 30 to the heat exchange device 20. The second output end 24 of the heat exchange device 20 is connected to the screw air compressor 10, and the 32°C liquid can be used as a coolant for the screw air compressor 10.

[0043] In this way, the present application can input liquid of a second preset temperature at the second input end 33 of the water source heat pump 30. After the liquid is cooled by the water source heat pump 30 and the heat exchange device 20, it can be used as a coolant for the screw air compressor 10, thereby replacing the need to configure a cooling tower for cooling the screw air compressor 10. There is no need to configure a cooling tower, thereby reducing water consumption and electricity consumption.

[0044] When the waste heat recovery system 100 of the present application is used as a waste heat recovery device for a screw air compressor 10, as described above, the water source heat pump 30 includes an evaporator, and the first output end 22 of the heat exchange device 20 is connected to the input end 31 of the evaporator. That is, when the liquid of the heat exchange device 20 is input into the water source heat pump 30, the heat exchange effect of the evaporator can make the temperature of the liquid reach the first preset temperature.

[0045] For example, after the heat exchange device 20 recovers the waste heat of the screw air compressor 10, the liquid temperature of the heat exchange device 20 is about 42°C, and is input into the evaporator of the water source heat pump 30 through the first output end 22 of the heat exchange device 20, and the liquid of the first preset temperature is output from the evaporator of the water source heat pump 30.

[0046] In this way, the evaporator in the water source heat pump 30 in the waste heat recovery system 100 of the present application plays a heat exchange role, which can make the liquid temperature reach a first preset temperature, for example, the first preset temperature is 80°C, so that the liquid of the target temperature required for the cleaning liquid in the cleaning tank 60 can be output, thereby realizing the waste heat recovery of the screw air compressor 10.

[0047] See also Figure 3 The waste heat recovery system 100 further includes a liquid application device 40. The first output end 32 of the water source heat pump 30 is connected to the input end 41 of the liquid application device 40 to provide the liquid application device 40 with liquid of a first preset temperature.

[0048] That is to say, the waste heat recovery system 100 of the present application can be applied to the scenario where the liquid application device 40 pre-treats the electrical appliance casing, and the hot water of the first preset temperature generated by the waste heat recovery system 100 can be used as a cleaning liquid to play a cleaning role in the liquid application device 40.

[0049] See also Figure 3 In certain embodiments of the present application, the liquid application device 40 includes a water separator 50 and a cleaning tank 60 , the first output end 32 of the water source heat pump 30 is connected to the input end 51 of the water separator 50 , and the output end 52 of the water separator 50 is connected to the input end 61 of the cleaning tank 60 .

[0050] Specifically, since the resistance generated when the fluid passes through different flow paths is different, the distribution ratio can be controlled by adjusting the valve of each flow path through the water divider 50 to achieve flow regulation. The water divider 50 can evenly divide the fluid in a fluid pipeline into two or more parts to achieve fluid separation.

[0051] In detail, when the water source heat pump 30 in the waste heat recovery system 100 inputs liquid of a first preset temperature to the liquid application device 40, the liquid needs to be diverted first due to the large total amount of liquid and the diverse pretreatment processes and complex environment. The diverted liquid can flow to cleaning tanks 60 of different specifications to process various home appliance casings.

[0052] In this way, the liquid in the liquid application device 40 is divided by the water distributor 50, and the liquid can be controllably distributed to the cleaning tanks 60 at different locations according to the purpose.

[0053] In addition, the number of the cleaning tank 60 of the present application can be at least one. Specifically, in the waste heat recovery system 100, a single cleaning tank 60 can receive liquid heated by the waste heat recovery system 100, meet the high temperature heating requirements during the cleaning process, and realize the most basic liquid application.

[0054] By configuring multiple cleaning tanks 60, cleaning work can be performed simultaneously or in different time periods, which is more flexible and improves production efficiency. Configuring multiple cleaning tanks 60 can also more effectively manage and distribute the recovered heat energy, ensuring that each cleaning tank 60 can obtain sufficient heat energy support while avoiding energy waste.

[0055] It can be understood that the liquid output after cooling by the liquid application device 40 can also flow back to the water source heat pump 30, the heat exchange device 20 and the screw air compressor 10 in sequence to provide coolant for the screw air compressor 10, thereby realizing the waste heat recovery cycle.

[0056] Specifically, Figure 3As shown, the output end 82 of the liquid application device 40 is connected to the second input end 33 of the water source heat pump 30, the second output end 34 of the water source heat pump 30 is connected to the second input end 23 of the heat exchange device 20, and the second output end 24 of the heat exchange device 20 is connected to the input end 11 of the screw air compressor 10, forming a waste heat recovery cycle.

[0057] In detail, after cleaning the electrical housing in the cleaning tank 60 for a period of time, the temperature of the cleaning liquid in the cleaning tank 60 decreases, and the cleaning liquid can be recovered. The cleaning liquid is collected into the water source heat pump 30 through the output end 82 of the liquid application device 40. After heat exchange with the water source heat pump 30, the cleaning liquid temperature drops to 32°C and is sent to the heat exchange device 20 to be provided as a coolant to the screw air compressor 10. The liquid flow completes a closed loop, forming a waste heat recovery cycle.

[0058] See also Figure 4 In some embodiments of the present application, the liquid application device 40 further includes a circulating water pump 70 and a water collector 80. The output end 52 of the water distributor is connected to the input end 71 of the circulating water pump 70, the output end 72 of the circulating water pump 70 is connected to the input end 61 of the cleaning tank 60, the output end 62 of the cleaning tank 60 is connected to the input end 81 of the water collector 80, and the output end 82 of the water collector 80 is connected to the second input end 33 of the water source heat pump 30.

[0059] Specifically, in a large system, the circulating water pump 70 is mainly used to balance the loads of different areas. By adjusting the circulating water pump flow in different areas, it can be ensured that the temperature of each area reaches the set value, thereby improving the comfort and efficiency of the system.

[0060] In detail, the liquid of the water distributor 50 flows out through the output end 52 and flows into the input end 71 of the circulating water pump 70. When the circulating water pumps 70 are distributed in different areas, the flow rate and temperature of the liquid can be adjusted independently, so that the liquid can flow stably from the output end 72 to the input end 61 of the cleaning tank 60, thereby preventing the liquid from stagnating for too long in a certain device of the liquid application device 40 and causing the device to be damaged by overheating.

[0061] The liquid then flows out from the output end 62 of the cleaning tank 60 and enters the input end 81 of the water collector 80. The water collector 80 is responsible for converging the cleaning liquid branches from each cleaning tank 60 and flowing into the second input end 33 of the water source heat pump 30 through the output end 82, thereby completing the cleaning application of the liquid and the recovery of the waste liquid.

[0062] In this way, the liquid application device 40 completes the work of stably diverting the 80°C hot water heated by the water source heat pump 30 into the cleaning tanks 60 of each branch line using the water distributor 50 and the circulating water pump 70, and then collecting the cleaning liquid after work through the water collector 80 and returning it to the water source heat pump 30.

[0063] When the number of the cleaning tanks 60 is one or more, the number of the circulating water pumps 70 may correspond to the number of the cleaning tanks 60. That is, for example, Figure 4 The number of cleaning tanks 60 shown can be 3, and the number of circulating water pumps 70 can also be 3 corresponding to the number of cleaning tanks 60. If the capacity of the cleaning tank 60 is large, more circulating water pumps 70 are required, and the number of circulating water pumps can be 4 or 5.

[0064] It is understandable that the size and capacity of the cleaning tank 60 determines the number of appliance housings that can be accommodated therein and the amount of water required. If the cleaning tank 60 is large, more water and a stronger water flow are required to ensure the cleaning effect, and a more powerful or more circulating water pump 30 needs to be configured. In addition, the configuration of the circulating water pump 30 and the cleaning tank 60 is also affected by the system design. Some systems may use a parallel connection method to connect multiple cleaning tanks 60 and circulating water pumps 70 to achieve more efficient cleaning and more flexible operation.

[0065] In this way, configuring a suitable number of circulating water pumps 70 according to the number of cleaning tanks 60 can make the cleaning operation more flexible and more efficient, allowing the entire waste heat recovery system 100 to operate efficiently.

[0066] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A waste heat recovery system, characterized in that: The waste heat recovery system includes a screw air compressor, a heat exchange device and a water source heat pump. The output end of the screw air compressor is connected to the first input end of the heat exchange device, the first output end of the heat exchange device is connected to the first input end of the water source heat pump, and the first output end of the water source heat pump outputs a liquid at a first preset temperature.

2. The waste heat recovery system according to claim 1, characterized in that: The second input end of the water source heat pump can input liquid of a second preset temperature, the second output end of the water source heat pump is connected to the second input end of the heat exchange device, and the second output end of the heat exchange device is connected to the screw air compressor to provide coolant for the screw air compressor.

3. The waste heat recovery system according to claim 1, characterized in that: The first preset temperature ranges from 75°C to 85°C.

4. The waste heat recovery system according to claim 1, characterized in that: The water source heat pump comprises an evaporator, and the output end of the heat exchange device is connected to the input end of the evaporator.

5. The waste heat recovery system according to claim 1, characterized in that: The waste heat recovery system also includes a liquid application device, and the first output end of the water source heat pump is connected to the input end of the liquid application device to provide the liquid with the first preset temperature to the liquid application device.

6. The waste heat recovery system according to claim 5, characterized in that: The liquid application device comprises a water separator and a cleaning tank. The first output end of the water source heat pump is connected to the input end of the water separator, and the output end of the water separator is connected to the input end of the cleaning tank.

7. The waste heat recovery system according to claim 6, characterized in that: The number of the cleaning tank is at least one.

8. The waste heat recovery system according to claim 7, characterized in that: The output end of the liquid application device is connected to the second input end of the water source heat pump, the second output end of the water source heat pump is connected to the second input end of the heat exchange device, and the second output end of the heat exchange device is connected to the input end of the screw air compressor to form a waste heat recovery cycle.

9. The waste heat recovery system according to claim 8, characterized in that: The liquid application device also includes a circulating water pump and a water collector. The output end of the water divider is connected to the input end of the circulating water pump, the output end of the circulating water pump is connected to the input end of the cleaning tank, the output end of the cleaning tank is connected to the input end of the water collector, and the output end of the water collector is connected to the second input end of the water source heat pump.

10. The waste heat recovery system according to claim 9, characterized in that: The number of the circulating water pumps corresponds to the number of the cleaning tanks.

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