A waste heat recovery system for drying room
The waste heat recovery system in drying rooms addresses high energy consumption and temperature fluctuations by converting air compressor waste heat into usable hot water, stabilizing heat supply, and optimizing energy use through controlled fluid flow and heat management.
Patent Information
- Application Number
- CN202410786583.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-18
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2044-06-18
AI Technical Summary
Existing drying room technologies rely heavily on continuous operation of heat pumps, leading to high energy consumption, energy waste due to frequent start-stop cycles, and temperature fluctuations that affect drying quality and equipment wear.
A waste heat recovery system that converts air compressor waste heat into hot water, storing it in an insulated tank for later use by a wind cabinet, supplemented by a heat pump when needed, with controlled fluid flow and temperature management to stabilize heat supply.
Reduces energy consumption and equipment wear by recycling waste heat, stabilizing temperature, and minimizing frequent heat pump startups, thereby improving energy utilization and drying quality.
Smart Images
Figure CN118517895B_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of drying rooms, and in particular to a waste heat recovery system for drying rooms. Background Art
[0002] As a key equipment for material drying, drying room occupies an important position in industrial production. Existing drying room technology mostly relies on heat pump system to provide heat source, and then heat exchange with the environment through the heat exchanger in the wind cabinet to heat up the air. Then, the heated air is circulated in the drying room by the fan in the wind cabinet to achieve the drying effect of the drying room. Since the heat pump needs to run continuously to maintain the temperature of the drying room, it leads to huge power consumption and increases the operating cost of the enterprise. At the same time, when the heat demand is small or intermittent, the frequent start and stop of the heat pump not only causes energy waste, but also affects the drying quality due to temperature fluctuations and aggravates the wear of the equipment. Summary of the invention
[0003] In order to improve energy utilization and reduce energy consumption, the present application provides a waste heat recovery system for a drying room.
[0004] The present application provides a waste heat recovery system for a drying room, which adopts the following technical solution:
[0005] A waste heat recovery system for a drying room, comprising:
[0006] Air compressor;
[0007] Insulated water tank, used to store and keep hot water warm;
[0008] A waste heat recovery device, the waste heat recovery device is used to convert the waste heat generated by the air compressor into hot water, the output end of the waste heat recovery device is connected to a main pipe, the output end of the main pipe is connected to the thermal insulation water tank, the main pipe is provided with a main water pump, and the main water pump is used to control the hot water generated by the waste heat recovery device to flow to the thermal insulation water tank;
[0009] A heat pump unit is connected to the thermal insulation water tank, and the heat pump unit is used to replenish hot water for the thermal insulation water tank when the air compressor is in a shutdown state;
[0010] A wind cabinet, connected to the heat preservation water tank, and used to provide circulating hot air for the drying room;
[0011] The temperature sensor is arranged in the drying room and is used for real-time monitoring of the temperature in the drying room. The temperature sensor is electrically connected to the wind cabinet.
[0012] By adopting the above technical solution, the air compressor will generate a lot of heat when in use. The waste heat generated by the air compressor is converted into hot water through the waste heat recovery device and stored in the insulated water tank, and then transported to the wind cabinet. The wind cabinet converts the heat of the water transferred from the insulated water tank into the heat in the air. The wind cabinet blows the heated air into the drying room to circulate the hot air, realize the drying operation of the drying room, and recover the heat generated by the air compressor to the drying heat of the drying room, thereby reducing the possibility of the air compressor tripping due to excessive temperature, while reducing energy consumption and improving energy utilization. When the air compressor stops, Start the heat pump unit, which will supplement the insulated water tank with hot water so that the drying room can have a sufficient heat source and improve the operating stability of the drying room. Use the insulated water tank as a heat transfer medium to store hot water in the insulated water tank, which is convenient for controlling the heat transfer. When the heat demand is small or intermittent, heat can be directly drawn from the insulated water tank to achieve drying operations. There is no need to frequently start and stop the heat pump unit, which reduces energy waste. The insulated water tank makes the temperature of the hot water tend to be stable, reducing the possibility of reduced drying quality due to large temperature fluctuations.
[0013] Optionally, there are multiple air compressors, each of which is provided with an oil outlet end, and an oil outlet pipe is connected to the oil outlet end, each of the air compressors is matched with a waste heat recovery device, and the waste heat recovery device includes a heat exchanger and a first branch pipe, a cooling pipe is provided in the heat exchanger, the input end of the cooling pipe is connected to the oil outlet end of the air compressor through the oil outlet pipe, the heat exchanger is provided with a water outlet end and a water inlet end, the first branch pipe is connected to the water outlet end, the heat exchanger is connected to the main pipe through the first branch pipe, the main water pump is electrically connected to the air compressor, and when the air compressor is turned on, the air compressor transmits an opening signal to the main water pump, and the first branch pipe is connected to the main pipe.
[0014] By adopting the above technical solution, multiple air compressors are equipped with their own waste heat recovery devices, and the waste heat of each air compressor is utilized and converted through a heat exchanger, and finally centrally managed through a main pipe and a water pump system to achieve energy saving. The start of the air compressor simultaneously triggers the operation of the main water pump, so that the main water pump responds immediately, and the connection between the first branch pipe and the main pipe is realized to achieve effective heat transmission, optimize energy utilization, and reduce energy waste.
[0015] Optionally, the input end of the cooling tube is located at the bottom of the heat exchanger, and the output end of the cooling tube is located at the top of the heat exchanger. A guide is connected to the bottom of the heat exchanger, and the guide covers one end of the cooling tube close to the oil outlet pipe. The water outlet end of the heat exchanger is located at the end of the guide close to the input end of the cooling tube.
[0016] By adopting the above technical solution, the input end of the cooling pipe is placed at the bottom of the heat exchanger, and the output end is placed at the top. Natural convection and precise fluid management are used to improve the heat exchange efficiency. The guide cover is closed at one end of the cooling pipe close to the oil outlet pipe. When the oil just enters the cooling pipe, the temperature is high and the heat transfer efficiency is fast, so that the water temperature at the guide is much higher than the water temperature in other parts. The water outlet end of the heat exchanger is located at the end of the guide close to the input end of the cooling pipe. Water flows from top to bottom and moves along the guide to further exchange heat with the cooling pipe, thereby increasing the water temperature and raising the temperature of the water flowing to the main pipe, reducing heat energy waste and improving energy utilization.
[0017] Optionally, the first branch pipe is provided with a first water pump, each air compressor is matched with one first water pump, and the air compressor is electrically connected to the first water pump. When the air compressor is turned on, the air compressor transmits an opening signal to the first water pump, and the first branch pipe is connected to the main pipe through the first water pump.
[0018] By adopting the above technical solution, in actual use, the air compressor is turned on according to specific needs, so that the air compressor is sometimes in a shutdown state. By matching a first water pump with each air compressor, the flow of water in the heat exchanger is controlled to achieve one-to-one water flow control, thereby reducing the possibility that the water in the heat exchanger enters the insulation water tank under the control of the main water pump, resulting in a drop in water temperature in the insulation water tank and insufficient heat supply, thereby reducing the possibility of heat supplement by the heat pump and reducing energy consumption.
[0019] Optionally, the input end of the wind cabinet is connected to a return pipe, the wind cabinet is connected to the insulation water tank through the return pipe, the return pipe is provided with a proportional regulating valve, and the proportional regulating valve is electrically connected to the temperature sensor.
[0020] By adopting the above technical solution, the fluid flow rate can be accurately adjusted according to actual needs, the possibility of overheating or cooling of the drying room can be reduced, and energy waste can be reduced. At the same time, by smoothly adjusting the flow rate, the number of system starts and stops can be reduced, thereby reducing energy loss caused by frequent starts and stops.
[0021] Optionally, the insulated water tank includes a tank body and an interlayer assembly, the interlayer assembly divides the tank body into a hot water layer and a heating layer, the hot water layer is located at the bottom of the heating layer, the interlayer assembly is provided with a connecting port, the hot water layer and the heating layer are connected through the connecting port, the hot water layer is connected to the waste heat recovery device, the heating layer is connected to the output end of the heat pump unit, and the hot water layer is connected to the input end of the wind cabinet.
[0022] By adopting the above technical scheme, the hot water generated by the waste heat recovery device flows to the hot water layer, and the hot water supply cabinet in the hot water layer performs heat conversion to improve the stable hot air circulation for the drying room. The heating layer is arranged on the top of the hot water layer. When it is necessary to supply heat to the hot water in the hot water layer, the heat pump unit is started, and the hot water generated by the heat pump unit is used for the heating layer. The hot water in the heating layer flows into the hot water layer through the connecting port, so that the hot water in the hot water layer can be stably supplied with heat, reducing the possibility of unstable heat transferred to the wind cabinet due to a sudden increase in the heat of the hot water in the hot water layer, thereby reducing the possibility of unstable hot water output from the wind cabinet leading to reduced drying quality.
[0023] Optionally, the partition assembly includes a partition and a spiral tube, the bottom of the partition is fixed to the top of the spiral tube, the outer wall of the partition is fixed to the inner wall of the box body, and the connecting port is opened along the spiral direction of the spiral tube.
[0024] By adopting the above technical solution, the hot water produced by the heat pump unit enters the heating layer, and then the hot water flows in a spiral through the connecting port and enters the hot water layer, providing a buffer time for the addition of hot water, reducing the possibility of reduced drying quality due to large changes in hot water temperature and unstable heat transfer, and improving heat utilization.
[0025] Optionally, one end of the spiral tube close to the partition is U-shaped.
[0026] By adopting the above technical scheme, the hot water flowing out of the heating layer is retained in the U-shaped pipe area, which helps to maintain the temperature stratification in the thermal insulation water tank, reduce the possibility of overall heat loss caused by the mixing of heat between the heating layer and the hot water layer, and thus reduce the possibility of heat loss when hot water enters the heating layer, thereby reducing energy consumption. At the same time, the hot water at the U-shaped pipe is used as a layer of "heat cover", and the U-shaped pipe can continuously dissipate heat and mix with the heat of the hot water layer, thereby reducing heat loss caused by the natural rise of heat in the hot water layer, enhancing the heat of the hot water layer, improving energy utilization, and reducing energy consumption.
[0027] Optionally, a cold water layer is provided at the bottom of the hot water layer, the cold water layer is connected to an external tap water pipe, and the cold water layer is connected to the heat pump unit.
[0028] By adopting the above technical solution, water is pre-stored in the cold water layer to buffer the seasonal changes in tap water temperature, making the water temperature entering the heat pump relatively stable, improving the working efficiency of the heat pump unit, and reducing the frequent startup of the compressor and load changes caused by water temperature fluctuations. At the same time, the cold water layer can be used as a temporary storage of thermal energy, which can be used for heating at night or during off-peak hours. The high efficiency of the heat pump unit can be used to reduce electricity consumption during peak hours and optimize energy utilization.
[0029] Optionally, the cold water layer is connected to a drain pipe, the cold water layer is connected to the output end of the wind cabinet through the drain pipe, and the drain pipe is provided with a drain valve.
[0030] By adopting the above technical solution, water can be recycled, the waste of water resources can be reduced, the utilization of external tap water resources can be reduced, the frequency of starting tap water can be reduced, and energy consumption can be reduced.
[0031] In summary, the present application includes at least one of the following beneficial technical effects:
[0032] 1. The air compressor generates a lot of heat when in use. The waste heat generated by the air compressor is converted into hot water through the waste heat recovery device and stored in the insulated water tank, and then transported to the wind cabinet. The wind cabinet converts the heat of the water transferred from the insulated water tank into the heat in the air. The wind cabinet blows the heated air into the drying room for hot air circulation to achieve the drying operation of the drying room. The heat generated by the air compressor is recovered and used in the drying heat of the drying room, reducing the possibility of the air compressor tripping due to excessive temperature, while reducing energy consumption and improving energy utilization. When the air compressor stops, the heat pump is started The heat pump unit supplements the heat of the insulated water tank with hot water, so that the drying room can have a sufficient heat source and improve the operating stability of the drying room; the insulated water tank is used as a heat transfer medium to store hot water in the insulated water tank, which is convenient for controlling the heat transfer. When the heat demand is small or intermittent, heat can be directly drawn from the insulated water tank to achieve drying operation. There is no need to frequently start and stop the heat pump unit, which reduces energy waste. The insulated water tank makes the temperature of the hot water tend to be stable, reducing the possibility of reduced drying quality due to large temperature fluctuations.
[0033] 2. In actual use, the air compressor is turned on according to specific needs, so that sometimes the air compressor is in a stopped state. By matching a first water pump with each air compressor, the flow of water in the heat exchanger is controlled to achieve one-to-one water flow control, which reduces the possibility that the water in the heat exchanger enters the insulation water tank under the control of the main water pump, resulting in a drop in water temperature in the insulation water tank and insufficient heat supply, thereby reducing the possibility of heat supplement by the heat pump and reducing energy consumption;
[0034] 3. The hot water flowing out of the heating layer is retained in the U-shaped pipe area, which helps to maintain the temperature stratification in the insulation water tank, reduce the possibility of overall heat loss caused by the mixing of heat between the heating layer and the hot water layer, and thus reduce the possibility of heat loss when hot water enters the heating layer, reducing energy consumption. At the same time, the hot water at the U-shaped pipe acts as a layer of "heat cover", and the U-shaped pipe can continuously dissipate heat and mix with the heat of the hot water layer, reducing heat loss caused by the natural rise of the hot water layer, enhancing the heat of the hot water layer, improving energy utilization, and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] Figure 1 It is a schematic diagram of the overall position relationship in the embodiment of the present application.
[0036] Figure 2 It is a schematic diagram of the structure of the waste heat recovery device in the embodiment of the present application.
[0037] Figure 3 It is a schematic diagram of the internal structure of the thermal insulation water tank in the embodiment of the present application.
[0038] Description of reference numerals:
[0039] 1. Air compressor; 11. Oil outlet pipe; 2. Insulated water tank; 21. Box body; 211. Hot water layer; 212. Heating layer; 213. Cold water layer; 2131. Drain pipe; 2132. Drain valve; 22. Interlayer assembly; 221. Partition; 222. Spiral pipe; 2221. Connecting port; 3. Waste heat recovery device; 31. Heat exchanger; 311. Cooling pipe; 312. Output pipe; 313. Guide; 32. First branch pipe; 321. First water pump; 4. Wind cabinet; 41. Return pipe; 42. Proportional control valve; 5. Main pipe; 51. Main water pump; 6. Temperature sensor; 7. Heat pump unit. DETAILED DESCRIPTION
[0040] The following is combined with Figure 1-3 This application is described in further detail.
[0041] The embodiment of the present application discloses a waste heat recovery system for a drying room.
[0042] Reference Figure 1 A waste heat recovery system for a drying room comprises an air compressor 1, an insulated water tank 2, a waste heat recovery device 3, and a wind cabinet 4. The air compressor 1 uses lubricating oil for cooling. The insulated water tank 2 is used to store and keep hot water warm. The input end of the waste heat recovery device 3 is connected to the air compressor 1. The waste heat recovery device 3 is used to convert the waste heat generated by the air compressor 1 into hot water. The output end of the waste heat recovery device 3 is connected to a main pipe 5. The output end of the main pipe 5 is connected to the insulated water tank 2. A main water pump 51 is provided on the delivery pipeline of the main pipe 5. The main water pump 51 is used to control the hot water generated by the waste heat recovery device 3 to flow to the insulated water tank 2. The wind cabinet 4 is connected to the insulated water tank 2. The wind cabinet 4 is used to provide circulating hot air for the drying room. A temperature sensor 6 is provided in the drying room. The temperature sensor 6 is electrically connected to the wind cabinet 4. The temperature sensor 6 is used to monitor the temperature in the drying room in real time and transmit the temperature information to the wind cabinet 4.
[0043] When the air compressor 1 is in use, the air compressor 1 generates a large amount of heat, which is transferred out of the air compressor 1 by the lubricating oil, thereby realizing a cooling operation on the air compressor 1. The waste heat generated by the air compressor 1 is converted into hot water by the lubricating oil under the action of the waste heat recovery device 3, and the main water pump 51 is started. The hot water converted by the waste heat recovery device 3 is stored in the insulation water tank 2 through the main pipe 5, thereby reducing the possibility of the air compressor 1 tripping due to excessive temperature. The insulation water tank 2 stores and insulates the hot water, and the hot water is then transported from the insulation water tank 2 to the wind cabinet 4. The wind cabinet 4 converts the heat of the water transferred by the insulation water tank 2 into heat in the air, and the wind cabinet 4 blows the heated air into the drying room for hot air circulation, thereby providing energy for the operation of the drying room, and recovering the heat generated by the air compressor 1 for use in the drying heat of the drying room, thereby reducing energy consumption and improving energy utilization.
[0044] It also includes a heat pump unit 7, which is mainly composed of a heat pump, a water pump and its connecting pipes. The output end of the heat pump unit 7 is connected to the insulated water tank 2. The heat pump unit 7 is used to replenish hot water for the insulated water tank 2 when the air compressor 1 is in a shutdown state.
[0045] When the air compressor 1 is shut down, the heat pump unit 7 is started, and the hot water generated by the heat pump unit 7 is transmitted to the insulated water tank 2 for hot water heat supplement. The heat source generated by the heat pump unit 7 is used as a supplementary energy source for the operation of the drying room, reducing energy consumption, so that the drying room can have a sufficient heat source, and the operating stability of the drying room is improved. At the same time, the insulated water tank 2 is used as a heat transfer medium to store hot water in the insulated water tank 2, which is convenient for controlling the transmission of heat. When the heat demand is small or intermittent, heat can be directly absorbed from the insulated water tank 2 to achieve drying operation. There is no need for frequent start and stop of the heat pump unit 7, which reduces energy waste. The insulated water tank 2 makes the temperature of the hot water tend to be stable, reducing the possibility of reduced drying quality due to large temperature fluctuations.
[0046] The input end of the wind cabinet 4 is connected to a return pipe 41 , and the input end of the wind cabinet 4 is connected to the insulation water tank 2 through the return pipe 41 . The return pipe 41 is provided with a proportional regulating valve 42 , and the proportional regulating valve 42 is electrically connected to the temperature sensor 6 .
[0047] When the drying room is in use, the temperature sensor 6 monitors the temperature in the drying room, and the temperature sensor 6 transmits the temperature information to the proportional control valve 42. The proportional control valve 42 accurately adjusts the fluid flow according to actual needs, reduces the possibility of overheating or cooling the drying room, and reduces energy waste.
[0048] In actual applications, in order to meet the use requirements of the drying room, a plurality of air compressors 1 are set up, and lubricating oil is used in the air compressor 1 to cool the air compressor 1. The air compressor 1 is provided with an oil inlet end and an oil outlet end, and the oil outlet end of the air compressor 1 is connected to an oil outlet pipe 11. Each air compressor 1 is matched with a waste heat recovery device 3 to recover the waste heat generated by each air compressor 1, thereby improving the waste heat recovery efficiency and achieving the purpose of energy saving. The output end of each waste heat recovery device 3 is connected to the main pipe 5, and the main water pump 51 is located at one end of the main pipe 5. When the waste heat is recovered, the converted hot water is concentrated and transported to the insulation water tank 2 through the main pipe 5.
[0049] Reference Figure 1 and Figure 2 The waste heat recovery device 3 includes a heat exchanger 31 and a first branch pipe 32. A cooling pipe 311 is arranged in the heat exchanger 31. The cooling pipe 311 is in a snake shape. The input end of the cooling pipe 311 is connected to the oil outlet end of the air compressor 1 through the oil outlet pipe 11. The cooling pipe 311 is connected to the output pipe 312. The output end of the cooling pipe 311 is connected to the oil inlet end of the air compressor 1 through the output pipe 312. The heat exchanger 31 is provided with a water outlet end and a water inlet end. The first branch pipe 32 is connected to the water outlet end. The water outlet end of the heat exchanger 31 is connected to the main pipe 5 through the first branch pipe 32. The main water pump 51 is electrically connected to the air compressor 1. When the air compressor 1 is turned on, the air compressor 1 transmits an opening signal to the main water pump 51, and the first branch pipe 32 is connected to the main pipe 5.
[0050] The start of the air compressor 1 simultaneously triggers the operation of the main water pump 51, so that the main water pump 51 responds immediately, and the connection between the first branch pipe 32 and the main pipe 5 is realized to achieve effective heat transmission, optimize energy utilization, and reduce energy waste.
[0051] The input end of the cooling pipe 311 is located at the bottom of the heat exchanger 31, the output end of the cooling pipe 311 is located at the top of the heat exchanger 31, and the water outlet end of the heat exchanger 31 is located at the bottom of the water inlet end. By arranging a pump on the output pipe 312, the flow of oil and the flow of water form convection, thereby enhancing the heat exchange effect, increasing the temperature of the water entering the thermal insulation water tank 2, improving energy utilization, and reducing the possibility of energy waste caused by insufficient heat exchange.
[0052] To further enhance the heat exchange effect, a guide 313 is connected to the bottom of the heat exchanger 31. The guide 313 covers one end of the cooling pipe 311 close to the oil outlet pipe 11. The water outlet of the heat exchanger 31 is located at one end of the guide 313 close to the input end of the cooling pipe 311. When the oil just enters the cooling pipe 311, the temperature is high and the heat transfer efficiency is fast, so that the water temperature at the guide 313 is much higher than the water temperature of other parts. The water outlet of the heat exchanger 31 is located at one end of the guide 313 close to the input end of the cooling pipe 311. Water flows from top to bottom and moves along the guide 313 to further exchange heat with the cooling pipe 311, thereby increasing the water temperature and raising the temperature of the water flowing to the main pipe 5, thereby reducing heat energy waste and improving energy utilization.
[0053] In order to meet the operation of the drying room, multiple air compressors 1 are set. However, in actual use, it is necessary to start the air compressor 1 according to specific needs, so that sometimes the air compressor 1 is in a stopped state. Under the control of the main water pump 51, the water that has not undergone heat exchange also enters the thermal insulation water tank 2, resulting in a decrease in heat energy. The main water pump 51 is also required to provide sufficient power supply, which wastes energy resources, and the output hot water may not meet the heat supply demand of the drying room. In order to improve energy utilization, the first branch pipe 32 is provided with a first water pump 321. Each air compressor 1 is matched with a first water pump 321, and the air compressor 1 is electrically connected to the first water pump 321. When the air compressor 1 is turned on, the air compressor 1 transmits an opening signal to the first water pump 321, and the first branch pipe 32 is connected to the main pipe 5 through the first water pump 321, realizing one-to-one water flow control, thereby reducing the possibility that the water in the heat exchanger 31 enters the insulated water tank 2 under the control of the main water pump 51, resulting in a drop in water temperature in the insulated water tank 2 and insufficient heat supply, thereby reducing the possibility of using a heat pump for heat supplement and reducing energy consumption.
[0054] Reference Figure 1 and Figure 3 The insulated water tank 2 includes a box body 21 and an interlayer assembly 22. The interlayer assembly 22 divides the box body 21 into a hot water layer 211 and a heating layer 212. The hot water layer 211 is located at the bottom of the heating layer 212. The interlayer assembly 22 is provided with a connecting port 2221. The hot water layer 211 and the heating layer 212 are connected through the connecting port 2221. The hot water layer 211 is connected to the first branch pipe 32 through the main pipe 5. The hot water layer 211 is located at one end of the main pipe 5 away from the waste heat recovery device 3. The heating layer 212 is connected to the output end of the heat pump unit 7. The output end of the hot water layer 211 is connected to the input end of the wind cabinet 4 through the return pipe 41.
[0055] When the heat of the air compressor 1 is to be recycled, the air compressor 1 is started, and the waste heat is transferred to the hot water layer 211 through the main pipe 5 under the action of heat exchange. The hot water in the hot water layer 211 is transported to the wind cabinet 4 under the action of the return pipe 41, and the wind cabinet 4 performs heat conversion to improve the stable hot air circulation for the drying room. The heating layer 212 is arranged on the top of the hot water layer 211. When it is necessary to supply heat to the hot water in the hot water layer 211, the heat pump unit 7 is started, and the hot water generated by the heat pump unit 7 is used to heat the layer 212. The hot water in the heating layer 212 flows into the hot water layer 211 through the connecting port 2221, so that the hot water in the hot water layer 211 can be stably supplied with heat, thereby reducing the possibility of unstable heat transferred to the wind cabinet 4 due to a sudden increase in the heat of the hot water in the hot water layer 211, thereby reducing the possibility of unstable hot water output from the wind cabinet 4 leading to reduced drying quality.
[0056] The partition assembly 22 includes a partition 221 and a spiral tube 222. The bottom wall of the partition 221 is fixed to the top wall of the spiral tube 222. The outer wall of the partition 221 is fixed to the inner wall of the box body 21. The connecting port 2221 is opened along the spiral direction of the spiral tube 222. The connecting port 2221 passes through the partition 221 and the spiral tube 222 to form a spiral channel opening.
[0057] When the hot water produced by the heat pump unit 7 enters the heating layer 212, the hot water flows in a spiral through the connecting port 2221 and slowly enters the hot water layer 211, providing a buffer time for adding hot water to the hot water layer 211, reducing the possibility of reduced drying quality due to large changes in hot water temperature and unstable heat transfer, and improving heat utilization.
[0058] The end of the spiral tube 222 away from the partition 221 is radially distributed with the output end of the hot water layer 211, so that the adding direction of hot water in the hot water layer 211 is away from the output end of the hot water layer 211, which is convenient for the temperature fusion of the hot water in the hot water layer 211.
[0059] One end of the spiral tube 222 close to the partition plate 221 is U-shaped.
[0060] When the heat pump unit 7 stops delivering hot water, the heating layer 212 stops inputting hot water, and under the action of the connecting port 2221, the hot water in the heating layer 212 flows into the hot water layer 211, and the hot water flowing out of the heating layer 212 is retained in the U-shaped tube area, which helps to maintain the temperature stratification in the box body 21, and reduces the possibility of overall heat loss caused by the mixing of heat between the heating layer 212 and the hot water layer 211, thereby reducing the possibility of heat loss when hot water enters the heating layer 212, reducing energy consumption, and at the same time, making the hot water at the U-shaped tube act as a layer of "heat cover", the U-shaped tube can continuously dissipate heat and mix with the heat of the hot water layer 211, reducing the heat loss caused by the natural rise of the heat in the hot water layer 211, enhancing the heat of the hot water layer 211, improving energy utilization, and reducing energy consumption.
[0061] A cold water layer 213 is provided at the bottom of the hot water layer 211, and the cold water layer 213 is connected to a drain pipe 2131. The cold water layer 213 is connected to the output end of the wind cabinet 4 through the drain pipe 2131, and the drain pipe 2131 is provided with a drain valve 2132. The cold water layer 213 is connected to the water inlet end of the heat exchanger 31, and a solenoid valve is provided on the connecting pipe between the cold water layer 213 and the heat exchanger 31. The solenoid valve is electrically connected to the first water pump 321, and the cold water layer 213 is connected to the input end of the heat pump unit 7, so that water is recycled, the waste of water resources is reduced, the utilization of external tap water resources is reduced, the frequency of starting tap water is reduced, and energy consumption is reduced.
[0062] At the same time, water resources will be lost during the use of the drying room. In order to reduce the possibility of insufficient water supply in the cold water layer 213, the cold water layer 213 is connected to the external tap water pipe, and the water in the cold water layer 213 can be replenished to reduce the possibility of heat loss caused by insufficient water, reduce energy consumption, and improve energy utilization.
[0063] The implementation principle of a waste heat recovery system for a drying room in the embodiment of the present application is as follows: the waste heat generated by the air compressor 1 is converted into hot water through the lubricating oil under the action of the waste heat recovery device 3, and is stored in the hot water layer 211 of the insulated water tank 2 through the main pipe 5. The hot water is then transported from the hot water layer 211 of the insulated water tank 2 to the wind cabinet 4. The wind cabinet 4 converts the heat of the water transferred by the insulated water tank 2 into the heat in the air. The wind cabinet 4 blows the heated air into the drying room to circulate the hot air, thereby providing energy for the operation of the drying room, and recovers the heat generated by the air compressor 1 for use in the drying heat of the drying room, thereby reducing the waste of heat energy. When the air compressor 1 stops, the heat pump unit 7 is started, and the heat pump unit The hot water generated by group 7 is transmitted to the heating layer 212 of the insulated water tank 2. The hot water in the heating layer 212 enters the hot water layer 211 through the spiral connecting port 2221 to supplement the hot water heat. The heat source generated by the heat pump unit 7 is used as a supplementary energy source for the operation of the drying room, so that the drying room can have a sufficient heat source, reduce energy consumption, and improve energy utilization. At the same time, the insulated water tank 2 is used as a heat transfer medium to facilitate the control of heat transmission. When the heat demand is small or intermittent, heat can be directly absorbed from the hot water layer 211 of the insulated water tank 2, and there is no need for frequent start and stop of the heat pump unit 7, which reduces equipment damage and energy loss.
[0064] The above are all preferred embodiments of the present application. The embodiments are only explanations of the present application and do not limit the protection scope of the present application in turn. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.
Claims
1. A waste heat recovery system for a drying room, characterized in that: include: Air compressor (1); A heat preservation water tank (2) for storing and preserving hot water; A waste heat recovery device (3), the waste heat recovery device (3) is used to convert waste heat generated by the air compressor (1) into hot water, the output end of the waste heat recovery device (3) is connected to a main pipe (5), the output end of the main pipe (5) is connected to the thermal insulation water tank (2), the main pipe (5) is provided with a main water pump (51), and the main water pump (51) is used to control the hot water generated by the waste heat recovery device (3) to flow to the thermal insulation water tank (2); A heat pump unit (7) is connected to the heat preservation water tank (2), and the heat pump unit (7) is used to replenish hot water for the heat preservation water tank (2) when the air compressor (1) is in a stopped state; A wind cabinet (4) is connected to the heat preservation water tank (2), and the wind cabinet (4) is used to provide circulating hot air for the drying room; A temperature sensor (6) is arranged in the drying room and is used to monitor the temperature in the drying room in real time. The temperature sensor (6) is electrically connected to the wind cabinet (4); The thermal insulation water tank (2) comprises a box body (21) and an insulation layer component (22); the insulation layer component (22) divides the box body (21) into a hot water layer (211) and a heating layer (212); the hot water layer (211) is located at the bottom of the heating layer (212); the insulation layer component (22) is provided with a connecting port (2221); the hot water layer (211) and the heating layer (212) are connected through the connecting port (2221); the hot water layer (211) is connected to the waste heat recovery device (3); the heating layer (212) is connected to the output end of the heat pump unit (7); and the hot water layer (211) is connected to the input end of the wind cabinet (4); The partition assembly (22) comprises a partition (221) and a spiral tube (222); the bottom of the partition (221) is fixed to the top of the spiral tube (222); the outer wall of the partition (221) is fixed to the inner wall of the box body (21); the communication port (2221) is opened along the spiral direction of the spiral tube (222); the communication port (2221) penetrates the partition (221) and the spiral tube (222) to form a spiral channel port; One end of the spiral tube (222) close to the partition (221) is U-shaped, and one end of the spiral tube (222) away from the partition (221) is radially distributed with the output end of the hot water layer (211), so that the direction of adding hot water to the hot water layer (211) is away from the output end of the hot water layer (211).
2. A waste heat recovery system for a drying room according to claim 1, characterized in that: The number of the air compressors (1) is plural, the air compressors (1) are provided with an oil outlet end, and the oil outlet end is connected to an oil outlet pipe (11), each of the air compressors (1) is matched with a waste heat recovery device (3), the waste heat recovery device (3) comprises a heat exchanger (31) and a first branch pipe (32), a cooling pipe (311) is provided in the heat exchanger (31), an input end of the cooling pipe (311) and an oil outlet end of the air compressor (1) are connected via the oil outlet pipe ( 11), the heat exchanger (31) is provided with a water outlet and a water inlet, the first branch pipe (32) is connected to the water outlet, the heat exchanger (31) is connected to the main pipe (5) through the first branch pipe (32), the main water pump (51) is electrically connected to the air compressor (1), when the air compressor (1) is turned on, the air compressor (1) transmits an opening signal to the main water pump (51), and the first branch pipe (32) is connected to the main pipe (5).
3. A waste heat recovery system for a drying room according to claim 2, characterized in that: The input end of the cooling pipe (311) is located at the bottom of the heat exchanger (31), and the output end of the cooling pipe (311) is located at the top of the heat exchanger (31). The bottom of the heat exchanger (31) is connected with a guide member (313), and the guide member (313) covers one end of the cooling pipe (311) close to the oil outlet pipe (11). The water outlet end of the heat exchanger (31) is located at one end of the guide member (313) close to the input end of the cooling pipe (311).
4. A waste heat recovery system for a drying room according to claim 2, characterized in that: The first branch pipe (32) is provided with a first water pump (321), each of the air compressors (1) is matched with one first water pump (321), and the air compressor (1) is electrically connected to the first water pump (321). When the air compressor (1) is turned on, the air compressor (1) transmits an opening signal to the first water pump (321), and the first branch pipe (32) is connected to the main pipe (5) through the first water pump (321).
5. The waste heat recovery system for a drying room according to claim 1, characterized in that: The input end of the wind cabinet (4) is connected to a return pipe (41), the wind cabinet (4) is connected to the thermal insulation water tank (2) through the return pipe (41), the return pipe (41) is provided with a proportional regulating valve (42), and the proportional regulating valve (42) is electrically connected to the temperature sensor (6).
6. The waste heat recovery system for a drying room according to claim 1, characterized in that: A cold water layer (213) is provided at the bottom of the hot water layer (211); the cold water layer (213) is connected to an external tap water pipe; and the cold water layer (213) is connected to the heat pump unit (7).
7. A waste heat recovery system for a drying room according to claim 6, characterized in that: The cold water layer (213) is connected to a drainage pipe (2131), and the cold water layer (213) is connected to the output end of the wind cabinet (4) through the drainage pipe (2131), and the drainage pipe (2131) is provided with a drainage valve (2132).