Energy-saving cold dryer with heat recovery function

Abstract

The utility model discloses an energy -saving type cold -drying machine with heat recovery function, including the casing, the cooling and dehumidification subassembly, cooling and dehumidification subassembly sets up in the input inside the casing, and cooling and dehumidification subassembly are used for carrying out cooling and dehumidification to marsh gas, heat exchange subassembly, heat exchange subassembly sets up in the output inside the casing, and heat exchange subassembly are used for carrying out the temperature rise processing to the marsh gas after cooling and dehumidification, in order to subsequent processing, through the casing and cooling and dehumidification subassembly and heat exchange subassembly with the cooperation of straight -in -out refrigerating unit, realized the step utilization and high -efficient recovery of energy, will cool down the integration of cooling and dehumidification and subsequent temperature rise processing in an organic whole to the dew point below the moisture of marsh gas, and then utilize the waste heat of refrigeration system itself and carry out the temperature rise to the low -temperature marsh gas after dehumidification, thereby improved the overall energy utilization efficiency, avoided the waste of condensing heat.

Description

Technical Field

[0001] This utility model relates to the technical field of energy-saving refrigerated dryers with heat recovery function, specifically an energy-saving refrigerated dryer with heat recovery function. Background Technology

[0002] As the global energy structure shifts towards a low-carbon model, biogas, as a byproduct of livestock and poultry farming, landfilling, and industrial organic wastewater treatment, has become an important renewable energy source due to its resource-utilizable characteristics. However, biogas carries a large amount of water during its production process. If it is not dehydrated, the water will combine with components such as hydrogen sulfide and carbon dioxide in the biogas to form a corrosive liquid, which will cause corrosion of the inner walls of subsequent pipelines, combustion equipment, or purification devices, thus shortening the service life of the equipment. Currently, the mainstream equipment for biogas dehydration in the industry is the refrigerated dryer. Its core principle is to use a refrigeration system to lower the temperature of biogas below the dew point, causing the water to condense and precipitate out, and then discharge it through a drainage device, thereby achieving biogas dehydration.

[0003] The existing biogas refrigerated dryers have the following technical problems: The condensation heat released by the condenser is mostly discharged directly into the environment through air cooling or water cooling without being recovered and utilized. Furthermore, the biogas temperature after dehydration is too low. If the equipment needs to enter normal temperature operation later, additional energy needs to be consumed to reheat the biogas, resulting in a significant increase in overall operating energy consumption, which does not meet the current industrial requirements for low carbon and energy conservation. Utility Model Content

[0004] The purpose of this invention is to provide an energy-saving refrigerated dryer with heat recovery function to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: An energy-saving refrigerated dryer with heat recovery function includes a shell; a cooling and dehumidifying component disposed in the input end of the shell, used to cool and dehumidify biogas; a heat exchange component disposed in the output end of the shell, used to heat the cooled and dehumidified biogas for subsequent processing; a direct expansion refrigeration unit, the compressor circuit of which is connected to the cooling and dehumidifying component via a flow divider; and a heat recovery connector, which connects the compressor circuit of the direct expansion refrigeration unit to the heat exchange component.

[0006] As a preferred technical solution, the cooling and dehumidification component includes a primary evaporator disposed inside the input end of the housing, and a secondary evaporator disposed on the rear side of the primary evaporator.

[0007] As a preferred technical solution, the heat exchange component includes a regenerative coil disposed inside the output end of the shell.

[0008] As a preferred technical solution, the flow-dividing connector includes a first tee pipe that is connected to the output end of the compressor inside the direct expansion refrigeration unit. One of the branch ends of each of the two sets of first tee pipes is connected to a heat dissipation component. The heat dissipation component is used to cool the high-temperature and high-pressure gaseous refrigerant discharged by the compressor. The output ends of the two sets of heat dissipation components are connected to a first check valve. The output ends of the two sets of first check valves are provided with a filter for filtering the gaseous refrigerant. The output ends of the two sets of filter components are respectively connected to a first-stage evaporator and a second-stage evaporator. The output ends of the first-stage evaporator and the second-stage evaporator are respectively connected to the input end of the compressor through a gas-liquid separator. The other branch ends of the first three-way pipe are all connected to electric regulating valves.

[0009] As a preferred technical solution, the heat dissipation assembly includes two sets of condensers disposed inside the upper side of the direct expansion refrigeration unit. The input ends of the two sets of condensers are respectively connected to one of the branch ends of the first three-way pipe, and the output ends of the two sets of condensers are respectively connected to the input ends of the first one-way valve on the corresponding side. The two sets of condensers are arranged symmetrically in a V-shape; The top of the direct expansion refrigeration unit is equipped with multiple sets of condensing fans, and the output ends of the multiple sets of condensing fans are all pointing downwards toward the two sets of condensers.

[0010] As a preferred technical solution, the filter element includes a liquid storage tank that is connected to the output ends of two sets of one-way valves respectively. The gas discharge ends of the two sets of liquid storage tanks are connected to filters. The output ends of the two sets of filters are connected to liquid level mirrors. The output ends of the two sets of liquid level mirrors are connected to expansion valves.

[0011] As a preferred technical solution, the gas-liquid separator includes gas-liquid separators respectively connected to the output ends of two sets of evaporators, and the output ends of the two sets of gas-liquid separators are respectively connected to the input ends of the corresponding side compressors.

[0012] As a preferred technical solution, the regenerative connector includes a second tee pipe connecting the condenser and the liquid storage tank in the corresponding circuit; The output end of the electric regulating valve, which is in the same circuit as the second three-way pipe, is connected to the input end of the regenerating coil. The output end of the regenerating coil is connected to a second one-way valve, and the output end of the second one-way valve is connected to the input end of the second three-way pipe.

[0013] As a preferred technical solution, the direct expansion refrigeration unit is equipped with an explosion-proof electrical box, and the explosion-proof electrical box is equipped with a control component. Multiple sets of condenser fans, electric regulating valves and compressors are all controlled by the control component. Temperature transmitters are provided at the delivery port of the housing, as well as at the delivery ends of the primary and secondary evaporators. The signal output terminals of the three sets of temperature transmitters are electrically connected to the control component via wires.

[0014] As a preferred technical solution, the bottom of the housing is connected to a drain pipe, and the surface of the drain pipe is provided with an electric heating tape.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model, through the cooperation of the shell, cooling and dehumidification components, heat exchange components, and direct expansion refrigeration unit, achieves the stepped utilization and efficient recovery of energy. It integrates cooling and dehumidification with subsequent heating treatment into one unit, which can first cool the biogas to below the dew point to precipitate moisture, and then use the waste heat generated by the refrigeration system itself to heat the dehumidified low-temperature biogas, thereby improving the overall energy utilization efficiency, avoiding the waste of condensation heat, and directly using the waste heat generated in the refrigeration process as the heat source for subsequent heating, realizing in-situ recovery and recycling of energy, without the need for additional energy consumption to reheat the biogas, avoiding the waste of thermal energy, and further improving the overall energy efficiency at the system level.

[0016] 2. By setting up a primary evaporator and a secondary evaporator, the biogas passes through the two evaporators in sequence, which can achieve gradient cooling, making the dehumidification process more gradual and thorough, and more effectively extracting water vapor from the biogas. Compared with a single-stage evaporator, it can improve dehumidification efficiency and dehumidification capacity.

[0017] 3. This utility model achieves direct and efficient condensation heat recovery through the setting of the regenerative coil. As a component of the refrigerant condensation and heat dissipation process, the regenerative coil directly transfers heat to the biogas that needs to be heated. The heat exchange path is short, the heat loss is small, and the response is rapid, thereby efficiently increasing the outlet temperature of the biogas and creating favorable conditions for subsequent process steps. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an energy-saving refrigerated dryer with heat recovery function according to this utility model; Figure 2 This is a front view structural diagram of the housing of this utility model; Figure 3 This is a schematic diagram of the structure of the first-stage evaporator of this utility model; Figure 4 This is a schematic diagram of the direct expansion refrigeration unit of this utility model; Figure 5 This is a side view of the direct expansion refrigeration unit of this utility model; Figure 6 This is a schematic diagram showing the installation position of the heat recovery connector of this utility model; Figure 7 This is a schematic diagram of the structure of the diversion and connecting component of this utility model.

[0019] In the picture: 100. Direct expansion refrigeration unit; 101. Condenser; 102. Condenser fan; 103. Compressor; 104. Explosion-proof electrical box; 200. Shell; 201. Drain pipe; 202. Primary evaporator; 203. Secondary evaporator; 204. Regenerator coil; 300. Diverter connector; 301. Electric regulating valve; 302. First check valve; 303. Liquid storage tank; 304. Filter; 305. Liquid level gauge; 306. Expansion valve; 307. Gas-liquid separator; 308. First tee pipe; 400, Regenerative connector; 401, Second check valve; 402, Second tee pipe. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-6This embodiment provides an energy-saving refrigerated dryer with heat recovery function, including a housing 200; a cooling and dehumidifying component, which is disposed in the input end of the housing 200 and is used to cool and dehumidify biogas; a heat exchange component, which is disposed in the output end of the housing 200 and is used to heat the cooled and dehumidified biogas for subsequent processing; a direct expansion refrigeration unit 100, whose compressor 103 circuit is connected to the cooling and dehumidifying component through a flow divider 300; and a heat recovery connector 400, which connects the compressor 103 circuit of the direct expansion refrigeration unit 100 to the heat exchange component. By integrating the shell 200, cooling and dehumidifying components, heat exchange components, and direct expansion refrigeration unit 100, energy is utilized in stages and efficiently recovered. Cooling and dehumidifying are integrated with subsequent heating treatment. The biogas is first cooled below the dew point to release moisture, and then the waste heat generated by the refrigeration system itself is used to heat the dehumidified low-temperature biogas, thereby improving the overall energy utilization efficiency and avoiding the waste of condensation heat. Furthermore, the waste heat generated in the refrigeration process is directly used as the heat source for subsequent heating, realizing in-situ energy recovery and recycling. There is no need to consume additional energy to reheat the biogas, avoiding the waste of thermal energy and improving the overall energy efficiency at the system level.

[0022] Among them, the direct expansion refrigeration unit 100 is a well-known technical means in the art. Its specific model can be WFLQD-100BF. Its specific structure and principle will not be described in detail here.

[0023] The cooling and dehumidification component includes a primary evaporator 202 located inside the input end of the housing 200, and a secondary evaporator 203 located behind the primary evaporator 202. Through the arrangement of the primary evaporator 202 and the secondary evaporator 203, the biogas passes through the two evaporators in sequence, which can achieve gradient cooling, making the dehumidification process more gradual and thorough, and more effectively extracting water vapor from the biogas. Compared with a single-stage evaporator, it can improve dehumidification efficiency and dehumidification capacity.

[0024] The heat exchange component includes a regenerating coil 204 located inside the output end of the housing 200. Through the regenerating coil 204, condensation heat recovery is achieved directly and efficiently. As a component of the refrigerant condensation heat dissipation process, the regenerating coil 204 directly transfers heat to the biogas that needs to be heated. The heat exchange path is short, the heat loss is small, and the response is rapid, thereby efficiently increasing the outlet temperature of the biogas and creating favorable conditions for subsequent process steps.

[0025] The flow divider 300 includes a first three-way pipe 308 that is connected to the output end of the compressor 103 inside the direct expansion refrigeration unit 100. One of the branch ends of the two sets of first three-way pipes 308 is connected to a heat dissipation component. The heat dissipation component is used to cool the high-temperature and high-pressure gaseous refrigerant discharged by the compressor 103. The output ends of the two sets of heat dissipation components are connected to a first one-way valve 302. The output ends of the two sets of first one-way valves 302 are provided with filter elements for filtering the gaseous refrigerant. The output ends of the two sets of filter elements are connected to the first-stage evaporator 202 and the second-stage evaporator 203, respectively. The output ends of the first-stage evaporator 202 and the second-stage evaporator 203 are connected to the input end of the compressor 103 through a gas-liquid separator. The other branch ends of the first three-way pipe 308 are all connected to electric regulating valves 301. Through the setting of the first three-way pipe 308 and the electric regulating valves 301, the refrigerant flow for condensation heat dissipation and regeneration temperature rise can be flexibly allocated. At the same time, the refrigerant that has passed through the heat dissipation component is treated by the filter and gas-liquid separator to ensure that the refrigerant entering the evaporator is stable and pure, and the entire system operates safely and reliably, extending the service life of the core components.

[0026] The heat dissipation component includes two sets of condensers 101 disposed inside the upper side of the direct expansion refrigeration unit 100. The input ends of the two sets of condensers 101 are respectively connected to one of the branch ends of the first three-way pipe 308, and the output ends of the two sets of condensers 101 are respectively connected to the input ends of the first one-way valve 302 on the corresponding side. The two sets of condensers 101 are arranged symmetrically in a V-shape; The top of the direct expansion refrigeration unit 100 is equipped with multiple sets of condenser fans 102. The output ends of the multiple sets of condenser fans 102 are all facing downwards toward the two sets of condensers 101. The arrangement of the condenser fans 102 forms a uniform and efficient forced convection heat dissipation air field, optimizes the air flow field around the condensers 101, significantly improves heat dissipation efficiency, and ensures that the refrigerant can be effectively liquefied at the set condensation temperature, thereby ensuring the stable and efficient operation of the entire refrigeration system.

[0027] The filter element includes a liquid storage tank 303 connected to the output ends of two sets of one-way valves. The gas discharge ends of both sets of liquid storage tanks 303 are connected to filters 304. The output ends of both sets of filters 304 are connected to level mirrors 305. The output ends of both sets of level mirrors 305 are connected to expansion valves 306. Through the setting of the filter element, the liquid refrigerant before entering the evaporator is ensured to be properly treated. The liquid storage tank 303 plays a role in stabilizing the refrigerant flow and storage. The filters 304 remove impurities and moisture from the system to prevent blockage and corrosion. The level mirrors 305 facilitate observation of the refrigerant status and maintenance diagnosis. The expansion valves 306 achieve precise throttling and pressure reduction, ensuring the cleanliness of the internal workings of the refrigeration system and the precise controllability of operating parameters.

[0028] The gas-liquid separator includes gas-liquid separators 307 connected to the output ends of two sets of evaporators. The output ends of the two sets of gas-liquid separators 307 are connected to the input ends of the corresponding compressors 103. By setting up the gas-liquid separators 307, the compressors 103 can be effectively protected to prevent liquid slugging. The refrigerant coming out of the evaporator may contain incompletely evaporated liquid droplets. The gas-liquid separators 307 can separate these liquid droplets to ensure that only gaseous refrigerant enters the compressors 103, thereby avoiding damage to the compressors 103 due to liquid intake and greatly improving the operational safety and reliability of the system.

[0029] The regenerative connector 400 includes a second tee pipe 402 connecting the condenser 101 and the liquid storage tank 303 in the corresponding circuit. The output end of the electric regulating valve 301, which is in the same circuit as the second three-way pipe 402, is connected to the input end of the regenerating coil 204. The output end of the regenerating coil 204 is connected to the second one-way valve 401, and the output end of the second one-way valve 401 is connected to the input end of the second three-way pipe 402, thus flowing into the storage tank 303. Through the setting of the second three-way pipe 402 and the electric regulating valve 301, the automatic and precise regulation of the regenerating heat is realized. In addition, combined with the control of the refrigerant flow into the regenerating coil 204 by the electric regulating valve 301, the regenerating heat can be adjusted in real time according to the set value of the biogas outlet temperature, thereby achieving stable control of the outlet temperature. Furthermore, the one-way valve prevents refrigerant backflow, ensuring the one-way nature and operational reliability of the heat recovery circuit. The output of another set of electric regulating valves 301 is connected to the input of the secondary evaporator 203.

[0030] The direct expansion refrigeration unit 100 is equipped with an explosion-proof electrical box 104, and the explosion-proof electrical box 104 is equipped with a control component. Multiple condenser fans 102, electric regulating valves 301 and compressors 103 are all controlled by the control component. Temperature transmitters are installed at the conveying port of the housing 200 and at the conveying ends of the primary evaporator 202 and the secondary evaporator 203. The signal output terminals of the three temperature transmitters are electrically connected to the control components via wires. Through multi-point temperature monitoring and logic control, the system can automatically adapt to load changes and maintain optimal operation, achieving energy efficiency. All electrical components are concentrated in the explosion-proof electrical box 104, meeting the inherent safety requirements in flammable and explosive environments. At the same time, automated control reduces the difficulty of operation and the reliance on manual intervention.

[0031] The control components include an electrical protection unit and a control unit; The control unit includes a controller, a CPU controller, and an analog expansion unit combined together, and also provides a touch screen; The controller and CPU controller work together to continuously collect various field signals from temperature transmitters, pressure sensors and other devices, and perform calculations strictly according to preset program logic, such as PID control algorithms, and then output control commands. The automation of the entire workflow includes, but is not limited to, automatically starting and stopping the compressor 103 based on temperature signals, adjusting the opening of the electric regulating valve 301 to control the heat recovery, and controlling the speed of the condenser fan 102. This is the foundation for achieving unattended intelligent operation of the equipment. The analog signal extension unit, as a sensory enhancer for the controller, is specifically designed to acquire and process a large number of continuously changing signals in the equipment, such as temperature, pressure, and valve opening, which are analog signals. It converts these analog signals into digital signals that the controller can process, thereby ensuring that the data on which the control decision is based is accurate and timely. As a point of observation connecting operators and equipment, touchscreens can display complex internal operating states in an intuitive form of graphics, data, and menus. It allows users to easily set target temperature, pressure and other parameters, and monitor the equipment's operating status in real time, such as the current temperature and the equipment's start-up and shutdown status. Furthermore, when a malfunction occurs, the touchscreen will clearly display the specific alarm information, greatly shortening the troubleshooting and repair time; At the same time, it provides a remote control interface to meet the needs of centralized monitoring in modern factories; The CPU controller can be a Siemens controller, and the controller can be Zhejiang Hongsen HC-10PIT.

[0032] The electrical protection unit includes air switches, contactors, thermal overload protectors, and phase sequence protectors to prevent overcurrent, overvoltage, undervoltage, and phase loss faults. An air switch, as the main power switch and the first-level short-circuit protection component, can quickly and safely cut off the power supply to the entire equipment when a serious overload or short-circuit fault occurs in the circuit, preventing the fault from escalating. It is the most basic guarantee of electrical safety.

[0033] The contactor, as a remote control actuator, receives instructions from the PLC control unit and is directly responsible for connecting or disconnecting the power supply of high-power loads such as compressor 103 and condenser fan 102, so as to realize the reliable control of the high-power power supply by the weak current control signal. Thermal overload protector is specially designed to protect motors. When the operating current of the motor exceeds the set value and continues for a period of time due to mechanical jamming, excessive load or abnormal voltage, it will act based on the principle of thermal effect, cut off the control circuit, and stop the motor from running, effectively preventing the motor from burning out due to overheating. Phase sequence protectors are used to monitor the quality of three-phase power supplies. They can detect whether the phase sequence of the power supply is correct and whether there is a missing phase. For three-phase motors such as compressor 103, an incorrect phase sequence will cause reverse rotation, and operation with a missing phase will quickly burn out the motor. This protector can lock the system the moment a fault occurs, prevent the equipment from starting and trigger an alarm to avoid catastrophic consequences.

[0034] The bottom of the housing 200 is connected to a drain pipe 201, and an electric heating tape is installed on the surface of the drain pipe 201. The electric heating tape effectively prevents the condensate drainage system from freezing and clogging in low-temperature environments. The electric heating tape can maintain the temperature inside the drain pipe 201, ensuring that the condensate generated during the cooling and dehumidification process can be discharged smoothly and in a timely manner. This avoids problems such as internal corrosion, pressure increase or functional failure that may be caused by water freezing, thus ensuring the long-term stable operation of the equipment under various environmental conditions.

[0035] Working principle; After the compressor 103 in the direct expansion refrigeration unit 100 starts, it discharges high-temperature and high-pressure gaseous refrigerant. The refrigerant is diverted through the first three-way pipe 308 in the diversion connector 300 to a portion of the refrigerant enter the heat dissipation component, and the other portion of the refrigerant enters the electric regulating valve 301. The refrigerant entering the heat dissipation component first flows into two sets of condensers 101 arranged symmetrically in a V shape. At this time, multiple sets of condensing fans 102 at the top of the direct expansion refrigeration unit 100 start, with the fan output end facing downward toward the condenser 101 to cool the high-temperature and high-pressure gaseous refrigerant in the condenser 101. The cooled refrigerant turns into a liquid state and then flows through the first one-way valve 302 and enters the filter element. The liquid refrigerant first enters the liquid storage tank 303 of the filter element for temporary storage, then flows through the filter 304 to remove impurities, and then passes through the liquid level mirror 305, and finally enters the expansion valve 306; the expansion valve 306 throttles and reduces the pressure of the liquid refrigerant, making it into a low-temperature and low-pressure gas-liquid mixture, which is then delivered to the first-stage evaporator 202 and the second-stage evaporator 203 respectively. The low-temperature, low-pressure gas-liquid mixture refrigerant in the primary evaporator 202 and the secondary evaporator 203 absorbs the heat of the biogas flowing through the evaporator, thereby cooling the biogas. During the biogas cooling process, the water vapor in it is released to form liquid water. At the same time, the refrigerant absorbs heat and evaporates into gas. It then flows through the gas-liquid separator 307 of the gas-liquid separator, and finally the gaseous refrigerant flows back to the input end of the compressor 103 to complete the refrigeration cycle. Furthermore, the liquid water released during the biogas cooling process collects at the bottom of the shell 200 and is discharged through the drain pipe 201 connected to the bottom of the shell 200. To prevent the water inside the drain pipe 201 from freezing and affecting the drainage, the electric heating tape installed on the surface of the drain pipe 201 is activated to maintain a stable temperature inside the drain pipe 201. After cooling and dehumidification, the biogas continues to flow towards the output end of the shell 200, passing through the heat exchange components inside the output end of the shell 200; At this time, in the circuit of the direct expansion refrigeration unit 100, the second three-way pipe 402 is connected between the condenser 101 and the liquid storage tank 303. At the same time, the other refrigerant diverted by the first three-way pipe 308 is transported to the heat recovery coil 204 by the flow rate regulated by the electric regulating valve 301. The refrigerant in the regenerator coil 204 exchanges heat with the cooled and dehumidified biogas flowing through it, and heats the biogas. After the heat exchange is completed, the refrigerant flows through the one-way valve and returns to the second three-way pipe 402, and finally flows into the liquid storage tank 303 to rejoin the refrigeration cycle. Furthermore, the explosion-proof electrical box 104 inside the direct expansion refrigeration unit 100 is equipped with control components during the operation of the device; Three sets of temperature transmitters are installed at the conveying port of the housing 200, the conveying end of the first-stage evaporator 202, and the conveying end of the second-stage evaporator 203. These transmitters detect the temperature signals at the corresponding locations in real time and transmit the signals to the control components via wires. The control component regulates the operating status of multiple condenser fans 102, electric regulating valves 301 and compressors 103 based on the received temperature signal to ensure stable temperature during biogas treatment and guarantee efficient operation of the device.

[0036] Although 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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving refrigerated dryer with heat recovery function, characterized in that, include: Housing (200); A cooling and dehumidifying component is disposed inside the input end of the housing (200) and is used to cool and dehumidify biogas. A heat exchange component is disposed in the output end of the housing (200). The heat exchange component is used to heat up the biogas after cooling and dehumidification for subsequent processing. A direct expansion refrigeration unit (100), wherein the compressor (103) circuit of the direct expansion refrigeration unit (100) is connected to the cooling and dehumidification assembly through a flow divider (300); A regenerative connector (400) is provided for connecting the compressor (103) circuit of the direct expansion refrigeration unit (100) to the heat exchange assembly.

2. The energy-saving refrigerated dryer with heat recovery function according to claim 1, characterized in that: The cooling and dehumidification assembly includes a primary evaporator (202) disposed inside the input end of the housing (200), and a secondary evaporator (203) disposed on the rear side of the primary evaporator (202).

3. The energy-saving refrigerated dryer with heat recovery function according to claim 2, characterized in that: The heat exchange assembly includes a regenerating coil (204) disposed inside the output end of the housing (200).

4. The energy-saving refrigerated dryer with heat recovery function according to claim 2, characterized in that: The diversion connector (300) includes a first three-way pipe (308) that is connected to the output end of the compressor (103) inside the direct expansion refrigeration unit (100). One of the branch ends of the two sets of first three-way pipes (308) is connected to a heat dissipation component. The heat dissipation component is used to cool the high-temperature and high-pressure gaseous refrigerant discharged by the compressor (103). The output ends of the two sets of heat dissipation components are connected to a first one-way valve (302). The output ends of the two sets of first one-way valves (302) are provided with a filter element for filtering the gaseous refrigerant. The output ends of the two sets of filter elements are connected to the first-stage evaporator (202) and the second-stage evaporator (203) respectively. The output ends of the first-stage evaporator (202) and the second-stage evaporator (203) are connected to the input end of the compressor (103) through a gas-liquid separator. The other branch ends of the first three-way pipe (308) are all connected to an electric regulating valve (301).

5. An energy-saving refrigerated dryer with heat recovery function according to claim 4, characterized in that: The heat dissipation assembly includes two sets of condensers (101) disposed inside the upper side of the direct expansion refrigeration unit (100). The input ends of the two sets of condensers (101) are respectively connected to one of the branch ends of the first three-way pipe (308), and the output ends of the two sets of condensers (101) are respectively connected to the input ends of the first one-way valve (302) on the corresponding side. The two sets of condensers (101) are arranged symmetrically in a V-shape; The top of the direct expansion refrigeration unit (100) is provided with multiple sets of condenser fans (102), and the output ends of the multiple sets of condenser fans (102) are all facing downward toward the two sets of condensers (101).

6. An energy-saving refrigerated dryer with heat recovery function according to claim 4, characterized in that: The filter element includes a storage tank (303) that is connected to the output ends of two sets of one-way valves respectively. The gas discharge ends of the two sets of storage tanks (303) are connected to a filter (304). The output ends of the two sets of filters (304) are connected to a level mirror (305). The output ends of the two sets of level mirrors (305) are connected to an expansion valve (306).

7. An energy-saving refrigerated dryer with heat recovery function according to claim 4, characterized in that: The gas-liquid separator includes gas-liquid separators (307) connected to the output ends of two sets of evaporators respectively, and the output ends of the two sets of gas-liquid separators (307) are respectively connected to the input ends of the corresponding side compressors (103).

8. An energy-saving refrigerated dryer with heat recovery function according to claim 5, characterized in that: The regenerative connector (400) includes a second tee pipe (402) connecting the condenser (101) and the liquid storage tank (303) of the corresponding circuit. The output end of the electric regulating valve (301), which is in the same circuit as the second three-way pipe (402), is connected to the input end of the regenerating coil (204). The output end of the regenerating coil (204) is connected to the second one-way valve (401), and the output end of the second one-way valve (401) is connected to the input end of the second three-way pipe (402).

9. An energy-saving refrigerated dryer with heat recovery function according to claim 5, characterized in that: The direct expansion refrigeration unit (100) is equipped with an explosion-proof electrical box (104), and the explosion-proof electrical box (104) is equipped with a control component. Multiple sets of condenser fans (102), electric regulating valves (301) and compressors (103) are all controlled by the control component. Temperature transmitters are provided at the delivery port of the housing (200) and the delivery ends of the first-stage evaporator (202) and the second-stage evaporator (203). The signal output terminals of the three sets of temperature transmitters are electrically connected to the control component through wires.

10. An energy-saving refrigerated dryer with heat recovery function according to any one of claims 1-9, characterized in that: The bottom of the housing (200) is connected to a drain pipe (201), and an electric heating tape is provided on the surface of the drain pipe (201).

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