Biogas cold-drying dehydrator with adjustable biogas outlet temperature

Abstract

The invention discloses a biogas cold-drying dehydrator with adjustable biogas outlet temperature, which belongs to the technical field of biogas dehydration, and comprises a plurality of cold-drying devices which are sequentially connected in series, the lower parts of the plurality of cold-drying devices are fixed on the ground through a support frame, the cold-drying devices are communicated through communicating pipes, the outer side of the cold-drying device at the gas inlet end is communicated with a biogas inlet pipe, and the outer side of the biogas inlet pipe is communicated with a biogas outlet pipe. According to the invention, a modular assembly design is adopted, flexible adjustment can be carried out according to the biogas flow demand, the installation efficiency and adaptability of the equipment are improved, the device is suitable for biogas treatment systems of different scales, and the device is convenient to use, high in practicability and easy to popularize and apply. The system has remarkable advantages in the aspects of energy conservation, efficiency, stability and intelligence, provides an efficient, economical and easy-to-maintain biogas treatment solution, and has a wide application prospect in the novel technical fields of full-amount recycling of feces and the like.

Description

Technical Field

[0001] This invention relates to the field of biogas dehydration technology, specifically to a biogas cold drying and dehydration machine with adjustable biogas outlet temperature. Background Technology

[0002] The full resource utilization of manure is a process of converting livestock and poultry manure and toilet waste into usable resources through specific technologies. It mainly includes technical pathways such as fertilizer production, energy conversion, and substrate production. This technology system utilizes processes such as aerobic composting, anaerobic fermentation, and microbial degradation to recover and utilize organic matter and nitrogen, phosphorus, and potassium nutrients. During the full resource utilization process, manure fermentation produces biogas. However, moisture and impurities in the biogas can reduce its combustion efficiency. Cold drying removes these components, allowing for more complete combustion, reducing energy waste, and improving utilization efficiency.

[0003] Biogas cold drying and dehydration is a process that removes moisture from biogas through condensation and cooling. The core equipment is a cold dryer, which uses a refrigeration system to lower the biogas temperature to below the dew point (2-8°C), causing gaseous water vapor to condense into liquid water, which is then discharged from the system. This process takes place in a closed pipeline, physically separating the moisture without the need for chemical reagents. When the biogas temperature decreases, the saturated water vapor in the biogas condenses into water, which is discharged from the biogas pipeline through self-drainage, thus achieving the purpose of biogas dehydration. Its main advantages are efficient removal of saturated water, protection of downstream equipment from corrosion and ice blockage, improved biogas combustion calorific value and stability, and ensured safe and efficient operation for subsequent utilization. It is one of the key steps in biogas pretreatment.

[0004] Due to varying biogas production rates, the efficiency of cold drying and dehydration equipment for biogas is fixed. If a single biogas dehydration unit is used, it needs to be customized based on the biogas production rate. If multiple biogas dehydration units operate simultaneously, each unit working independently requires the laying of pipelines connecting to the biogas dehydration units, increasing the cost of individual pipeline installation. Furthermore, using the same pipeline between them makes it inconvenient to connect and assemble them together.

[0005] The outlet temperature of biogas after cold drying and dehydration directly determines the final dehydration effect. The lower the temperature, the less water vapor content remains in the biogas. By precisely adjusting the temperature, it can be ensured that the water content of the biogas meets the requirements of subsequent processes. If the outlet temperature of the biogas is too low, the methane and water in the biogas are prone to form solid crystals. If the outlet temperature of the biogas is too high, it will lead to an excessively high water vapor content in the biogas.

[0006] Therefore, a biogas cold drying and dehydration machine that can be modularly assembled and whose biogas outlet temperature can be flexibly adjusted is needed. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the present invention provides a biogas cold drying and dehydration machine with adjustable biogas outlet temperature.

[0008] The technical solution of the present invention is: a biogas cold drying and dehydration machine with adjustable biogas outlet temperature, comprising multiple cold drying devices connected in series, the lower part of the multiple cold drying devices being fixed to the ground by a support frame, the cold drying devices being connected to each other by a connecting pipe, a biogas inlet pipe being connected to the outside of the cold drying device at the inlet end, and a biogas outlet pipe being connected to the outlet end, and a PLC controller electrically connected to the cold drying device being provided on the support frame. The refrigerated drying equipment includes a refrigerated drying chamber with a coiled condenser tube in the middle and a refrigerant tank at the top. The inlet of the refrigerant tank is connected to the outlet of the condenser tube, and a pressure regulating valve is installed at the connection. The outlet of the refrigerant tank is connected to a compressor via a copper pipe, and a pressure regulating valve is installed on the copper pipe. The outlet of the compressor is connected to a condenser via a copper pipe, and the outlet of the condenser is connected to a dryer filter. The outlet of the dryer filter is connected to an expansion valve via a copper pipe, and the outlet of the expansion valve is connected to the inlet of the condenser tube. A drain pipe is installed at the bottom of the refrigerated drying chamber.

[0009] Furthermore, a temperature sensor electrically connected to the PLC controller is installed inside the biogas outlet pipe, a temperature display electrically connected to the PLC controller and the temperature sensor is installed on the outer wall of the biogas outlet pipe, and a gas pump is installed in the middle of the biogas outlet pipe.

[0010] Explanation: The power of the compressor is controlled by the PLC controller, which in turn adjusts the biogas outlet temperature. The biogas outlet temperature is detected by a temperature sensor and displayed on a temperature display.

[0011] Furthermore, the drying filter includes a filter housing, inside which are provided two filter screens, and a desiccant is disposed between the two filter screens.

[0012] Note: Impurities in the refrigerant are filtered out by the dryer filter.

[0013] Furthermore, the condenser includes a heat dissipation pipe connected to the copper tube, the end of the heat dissipation pipe being connected to the dryer filter, the outer wall of the heat dissipation pipe being provided with heat dissipation fins, the heat dissipation pipe being connected to a heat dissipation shell via a connecting pipe, a heat dissipation fan being provided on one side of the heat dissipation shell, and a protective net being fixed to the heat dissipation shell being provided on the outer side of the heat dissipation fan.

[0014] Explanation: The refrigerant, after being compressed by the compressor, becomes a high-temperature, high-pressure gas. This high-temperature, high-pressure gas exchanges heat with the outside air through the heat sink, forming a low-temperature, high-pressure gas. The heat sink helps to improve the heat exchange efficiency between the heat sink and the outside air, and the cooling fan helps to increase the airflow speed, thereby improving the heat exchange efficiency between the heat sink and the outside air.

[0015] Furthermore, the drain pipe is equipped with a water trap, and the end of the drain pipe is equipped with a control valve and a check valve.

[0016] Note: The water trap can form a liquid seal to prevent biogas in the refrigerated drying box from overflowing from the drain pipe, and the control valve can control the draining speed.

[0017] Furthermore, a water receiving trough is provided below the drain pipe and is fixedly connected to the support frame. The end of the water receiving trough is connected to a water collection trough. A liquid pump is provided in the water collection trough. A water spray head is provided on one side of the heat dissipation shell. The liquid pump and the water spray head are connected by a water pipe.

[0018] Explanation: The condensate flowing out of the drain pipe is collected by the water collection tank, and the water mist is sprayed onto the heat sink shell through the spray nozzle. The cooling fan blows the water mist to the heat sink tubes to exchange heat with the heat sink tubes, which can effectively improve the heat dissipation efficiency of the heat sink tubes.

[0019] Furthermore, the refrigerant tank is equipped with a pressure gauge and an inflation port, and a safety valve is provided at the connection between the inflation port and the refrigerant tank.

[0020] Note: The pressure inside the refrigerant tank is detected by a pressure gauge, and refrigerant is added to the tank through the charging port. The safety valve prevents excessive refrigerant from being added, which could lead to equipment failure.

[0021] Furthermore, the refrigerated drying box includes an inner shell and an outer shell, with an insulation layer provided between the inner shell and the outer shell.

[0022] Explanation: The insulation layer increases the duration of the low-temperature environment inside the refrigerated drying chamber, reduces the heat exchange efficiency between the refrigerated drying chamber and the outside air, and thus improves the refrigeration and drying efficiency inside the refrigerated drying chamber.

[0023] Furthermore, an electric heating grid electrically connected to the PLC controller is provided on one side of the condenser tube, a second temperature sensor is provided inside the cold drying box, and a second temperature display is provided on the outer wall of the cold drying box for electrically connecting with the second temperature sensor and the PLC controller.

[0024] Explanation: The electric heating grid is controlled by a PLC controller to defrost the condenser tubes, thereby improving the heat exchange efficiency between the condenser tubes and biogas. When the electric heating grid is not heating, it will also condense the water vapor in the biogas, improving the cold drying efficiency of the biogas.

[0025] As another aspect of the present invention, a biogas cold drying and dehydration machine with adjustable biogas outlet temperature is designed in the present invention, which can be used in the full-scale resource utilization treatment of manure and sewage, and performs cold drying and dehydration treatment on the biogas produced by manure fermentation.

[0026] Note: This device is used in the full-scale resource utilization of manure and wastewater, and can effectively dehydrate the biogas produced from manure and wastewater.

[0027] The beneficial effects of this invention are as follows: The biogas cold drying and dehydration machine with adjustable biogas outlet temperature offers significant technical advantages through several innovative designs. Firstly, the modular assembly design allows for flexible adjustment according to biogas flow requirements, improving installation efficiency and adaptability, making it suitable for biogas treatment systems of different scales. Secondly, by using the condensate generated by the cold drying equipment in the condenser's heat dissipation system, not only is the condensation effect optimized, but the cooling efficiency of the cold drying box is also improved, significantly reducing energy consumption and offering high economic and environmental benefits. Simultaneously, equipped with a PLC controller and temperature sensor, it can monitor and precisely adjust the biogas outlet pipe temperature in real time, ensuring accurate temperature control and adapting to different operating conditions. Furthermore, the drainage system design of the cold drying box effectively discharges condensate, preventing water accumulation and malfunctions, thus improving equipment stability and service life. The condenser's heat dissipation design, combined with heat sinks and a cooling fan, enhances heat dissipation capacity, ensuring safe operation of the equipment in high-temperature environments and extending its durability. Finally, the intelligent temperature monitoring and adjustment system simplifies operation, reduces human error, and improves the system's automation level. In summary, this invention has significant advantages in energy saving, efficiency, stability, and intelligence, and provides a highly efficient, economical, and easy-to-maintain biogas treatment solution with broad application prospects in emerging technology fields such as the full resource utilization of manure. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention.

[0029] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0030] Figure 3 This is a left view of the condenser of the present invention.

[0031] Figure 4 This is a cross-sectional view of the drying filter of the present invention.

[0032] Figure 5 This is a partial cross-sectional view of the refrigerated drying box of the present invention.

[0033] Figure 6 This is a left view of the refrigerated drying oven of the present invention.

[0034] Figure 7 This is a diagram showing the connection relationship between the heat pipe and the heat sink of the present invention.

[0035] The components are as follows: 1-Refrigerated drying equipment, 2-Support frame, 3-Connecting pipe, 4-Biogas inlet pipe, 5-Biogas outlet pipe, 6-PLC controller, 11-Refrigerated drying box, 12-Condenser pipe, 13-Refrigerant tank, 131-Pressure regulating valve one, 14-Copper pipe one, 141-Pressure regulating valve two, 15-Compressor, 16-Copper pipe two, 17-Condenser, 18-Drying filter, 181-Copper pipe three, 182-Expansion valve, 111-Drain pipe, 51-Temperature sensor one, 52-Temperature display one, 183-Filter housing, 184-Filter screen, 185-Drying... 171-Heat pipe, 172-Heat fin, 173-Connecting pipe, 174-Heat shell, 175-Heat fan, 176-Protective net, 112-Water trap, 113-Control valve, 114-Check valve, 21-Water inlet, 22-Water collection tank, 23-Liquid pump, 24-Spray nozzle, 25-Water pipe, 53-Air pump, 132-Pressure gauge, 133-Inflation port, 134-Safety valve, 115-Inner shell, 116-Outer shell, 117-Insulation layer, 7-Electric heating mesh, 71-Temperature sensor II, 72-Temperature display II. Detailed Implementation

[0036] Example 1: like Figure 1 As shown, a biogas cold drying and dehydration machine with adjustable biogas outlet temperature includes multiple cold drying devices 1 connected in series. The lower part of the multiple cold drying devices 1 is fixed to the ground by a support frame 2. The cold drying devices 1 are connected to each other by a connecting pipe 3. The outside of the cold drying device 1 at the air inlet end is connected to a biogas inlet pipe 4, and the air outlet end is connected to a biogas outlet pipe 5. A PLC controller 6 electrically connected to the cold drying device 1 is provided on the support frame 2. The refrigerated drying equipment 1 includes a refrigerated drying chamber 11. A coiled condenser tube 12 is provided in the middle of the refrigerated drying chamber 11. A refrigerant tank 13 is provided at the top of the refrigerated drying chamber 11. The inlet of the refrigerant tank 13 is connected to the outlet of the condenser tube 12, and a pressure regulating valve 131 is provided at the connection. The outlet of the refrigerant tank 13 is connected to a compressor 15 through a copper pipe 14. A pressure regulating valve 141 is provided on the copper pipe 14. The outlet of the compressor 15 is connected to a condenser 17 through a copper pipe 16. The outlet of the condenser 17 is connected to a dryer filter 18. The outlet of the dryer filter 18 is connected to an expansion valve 182 through a copper pipe 181. The outlet of the expansion valve 182 is connected to the inlet of the condenser tube 12. A drain pipe 111 is provided at the bottom of the refrigerated drying chamber 11.

[0037] A temperature sensor 51 electrically connected to a PLC controller 6 is installed inside the biogas outlet pipe 5. A temperature display 52 electrically connected to the PLC controller 6 and the temperature sensor 51 is installed on the outer wall of the biogas outlet pipe 5. A gas pump 53 is installed in the middle of the biogas outlet pipe 5.

[0038] The power of the compressor 15 is controlled by the PLC controller 6, thereby adjusting the biogas outlet temperature. The biogas outlet temperature is detected by the temperature sensor 51 and displayed by the temperature display 52. ​​The air pump 53 reduces the gas pressure in the cold drying box 11 to prevent biogas from leaking from the drain pipe 111 due to excessive gas pressure.

[0039] like Figure 4 As shown, the dryer filter 18 includes a filter housing 183, inside which are two filter screens 184, and between the two filter screens 184 is a desiccant 185.

[0040] Impurities in the refrigerant are filtered through the dryer filter 18, and the dryer used is a commercially available product.

[0041] like Figure 3 , Figure 7 As shown, the condenser 17 includes a heat dissipation pipe 171 connected to the copper pipe 16. The end of the heat dissipation pipe 171 is connected to the dryer filter 18. The outer wall of the heat dissipation pipe 171 is provided with heat dissipation fins 172. The heat dissipation pipe 171 is connected to a heat dissipation shell 174 through a connecting pipe 173. A cooling fan 175 is provided on one side of the heat dissipation shell 174. A protective net 176 fixed to the heat dissipation shell 174 is provided on the outside of the cooling fan 175.

[0042] The refrigerant compressed by the compressor 15 becomes a high-temperature and high-pressure gas. The high-temperature and high-pressure gas exchanges heat with the outside air through the heat sink 171 to form a low-temperature and high-pressure gas. The heat sink 172 helps to improve the heat exchange efficiency between the heat sink 171 and the outside air. The cooling fan 175 helps to increase the airflow speed of the outside air, thereby improving the heat exchange efficiency between the heat sink 171 and the outside air.

[0043] like Figure 2 As shown, the refrigerant tank 13 is equipped with a pressure gauge 132 and an inflation port 133, and a safety valve 134 is provided at the connection between the inflation port 133 and the refrigerant tank 13.

[0044] The pressure inside the refrigerant tank 13 is detected by the pressure gauge 132, and refrigerant is added to the refrigerant tank 13 through the charging port 133. The safety valve 134 prevents excessive refrigerant from being added, which could lead to equipment failure.

[0045] Example 2: The difference between this embodiment and embodiment 1 is that in this embodiment, the drain pipe 111 is provided with a water trap 112, and the end of the drain pipe 111 is provided with a control valve 113 and a one-way valve 114.

[0046] Compared with Example 1, in this embodiment, the water trap 112 can form a liquid seal to prevent biogas in the cold drying box 11 from overflowing from the drain pipe 111, the control valve 113 can control the draining speed, and the one-way valve 114 can effectively prevent liquid backflow.

[0047] Example 3: The difference between this embodiment and embodiment 2 is that, in this embodiment, a water receiving trough 21 is provided below the drain pipe 111 and is fixedly connected to the support frame 2. The end of the water receiving trough 21 is connected to a water collecting trough 22. A liquid pump 23 is provided in the water collecting trough 22. A water spray head 24 is provided on one side of the heat dissipation shell 174. The liquid pump 23 and the water spray head 24 are connected by a water pipe 25.

[0048] Compared with Embodiment 2, in this embodiment, the condensate flowing out of the drain pipe 111 is collected by the water tank 21, and the water mist is sprayed onto the heat sink 174 by the spray head 24. The water mist is blown to the heat sink 171 by the cooling fan 175 and exchanged with the heat sink 171, which can effectively improve the heat dissipation efficiency of the heat sink 171.

[0049] Example 4: The difference between this embodiment and embodiment 3 is that this embodiment provides an application of a biogas cold drying and dehydration machine with adjustable biogas outlet temperature. This biogas cold drying and dehydration machine with adjustable biogas outlet temperature is used in the full-scale resource utilization treatment of manure and sewage to perform cold drying and dehydration treatment on the biogas produced by manure fermentation.

[0050] Compared to Example 3, in this embodiment, the device is used in the full-scale resource utilization of manure and wastewater, and can effectively dehydrate the biogas produced by manure and wastewater.

[0051] Example 5: The difference between this embodiment and embodiment 4 is that, in this embodiment, as Figure 5 As shown, the refrigerated drying box 11 includes an inner shell 113 and an outer shell 114, with an insulation layer 115 provided between the inner shell 113 and the outer shell 114.

[0052] Compared with Example 4, this embodiment improves the duration of low-temperature environment maintenance inside the cold drying box 11 by using the insulation layer 115, thereby reducing the heat exchange efficiency between the cold drying box 11 and the outside air and thus improving the cold drying efficiency inside the cold drying box 11.

[0053] Example 6: The difference between this embodiment and embodiment 5 is that, in this embodiment, as Figure 6 As shown, an electric heating grid 7 electrically connected to a PLC controller 6 is provided on one side of the condenser tube 12. A temperature sensor 71 is provided inside the cold drying box 11. A temperature display 72 electrically connected to the temperature sensor 71 and the PLC controller 6 is provided on the outer wall of the cold drying box 11.

[0054] Compared to Example 5, in this embodiment, the electric heating grid 7 is controlled by the PLC controller 6 to defrost the condenser tube 12, thereby improving the heat exchange efficiency between the condenser tube 12 and the biogas. When the electric heating grid 7 is not heating, it will also condense the water vapor in the biogas, thereby improving the cold drying efficiency of the biogas.

[0055] The operating method of the biogas cold drying and dehydration machine with adjustable biogas outlet temperature in Embodiment 6 above includes the following steps: S1. According to the biogas output, multiple cold drying devices 1 are connected in series. After the biogas with high humidity passes through the cold drying box 11, the water vapor passes through the condenser pipe 12 and condenses into droplets. The droplets fall to the bottom of the cold drying box 11, are discharged through the drain pipe 111 and drip into the water collection tank 21, and then flow into the water collection tank 22 for collection. S2. After the refrigerant in the condenser tube 12 exchanges heat with the biogas, it flows into the compressor 15 after passing through the refrigerant tank 13. After being compressed by the compressor 15, it forms a high-temperature and high-pressure gas. After passing through the condenser 17, the high-temperature and high-pressure gas exchanges heat with the outside air through the heat dissipation tube 171, which lowers the temperature of the refrigerant in the heat dissipation tube 171 and forms a high-pressure and low-temperature gas. The high-pressure and low-temperature gas flows through the dryer filter 18 to filter out impurities in the refrigerant and dry the refrigerant. After passing through the expansion valve 182, the high-pressure and low-temperature gas forms a low-temperature and low-pressure liquid. The low-temperature and low-pressure liquid flows into the condenser tube 12 and exchanges heat with the biogas. After vaporization, it enters the refrigerant tank 13 to form a refrigerant cycle. S3. The condensate in the water collection tank 22 is pumped out of the pumping pipe by the liquid pump 23 to the water spray head 24. The sprayed water mist exchanges heat with the heat pipe 171 under the action of the cooling fan 185, thereby improving the cooling efficiency of the refrigerant in the heat pipe 171. S4. After a period of use, frost forms on the condenser pipe 12, which reduces the biogas flow. The PLC controller 6 controls the electric heating grid 7 to generate heat, so that the frost on the condenser pipe 12 can be exchanged for heat, thereby defrosting the condenser pipe 12 and improving the heat exchange efficiency between biogas and the condenser pipe 12.

[0056] The PLC controller 6, compressor 15, temperature sensor 1 51, temperature display 1 52, cooling fan 175, liquid pump 23, electric heating grid 7, temperature sensor 2 71, temperature display 2 72, pressure regulating valve 1 131, pressure regulating valve 2 141, check valve 114, and safety valve 134 used in the above embodiments are all commercially available products. As long as they can achieve the functions of this invention, they are acceptable. Those skilled in the art can choose to use them based on common sense, and no special limitations are made here.

Claims

1. A biogas cold drying and dehydration machine with adjustable biogas outlet temperature, characterized in that, It includes multiple refrigerated drying devices (1) connected in series. The lower part of the multiple refrigerated drying devices (1) is fixed to the ground by a support frame (2). The refrigerated drying devices (1) are connected to each other by a connecting pipe (3). The outside of the refrigerated drying device (1) at the air inlet end is connected to a biogas inlet pipe (4), and the air outlet end is connected to a biogas outlet pipe (5). The support frame (2) is equipped with a PLC controller (6) that is electrically connected to the refrigerated drying device (1). The refrigerated drying equipment (1) includes a refrigerated drying box (11), a coiled condenser tube (12) in the middle of the refrigerated drying box (11), a refrigerant tank (13) at the top of the refrigerated drying box (11), the inlet of the refrigerant tank (13) is connected to the outlet of the condenser tube (12), and a pressure regulating valve (131) is provided at the connection. The outlet of the refrigerant tank (13) is connected to a compressor (15) through a copper pipe (14), a pressure regulating valve (141) is provided on the copper pipe (14), the outlet of the compressor (15) is connected to a condenser (17) through a copper pipe (16), the outlet of the condenser (17) is connected to a dryer filter (18), the outlet of the dryer filter (18) is connected to an expansion valve (182) through a copper pipe (181), the outlet of the expansion valve (182) is connected to the inlet of the condenser tube (12), and a drain pipe (111) is provided at the bottom of the refrigerated drying box (11).

2. The biogas cold drying and dehydration machine with adjustable biogas outlet temperature as described in claim 1, characterized in that, The biogas outlet pipe (5) is equipped with a temperature sensor (51) electrically connected to the PLC controller (6), and the outer wall of the biogas outlet pipe (5) is equipped with a temperature display (52) electrically connected to the PLC controller (6) and the temperature sensor (51). The middle part of the biogas outlet pipe (5) is equipped with a vacuum pump (53).

3. The biogas cold drying and dehydration machine with adjustable biogas outlet temperature as described in claim 1, characterized in that, The dryer filter (18) includes a filter housing (183), which contains two filter screens (184) and a desiccant (185) between the two filter screens (184).

4. A biogas cold drying and dehydration machine with adjustable biogas outlet temperature as described in claim 1, characterized in that, The condenser (17) includes a heat dissipation pipe (171) connected to the copper pipe (16). The end of the heat dissipation pipe (171) is connected to the dryer filter (18). The outer wall of the heat dissipation pipe (171) is provided with heat dissipation fins (172). The heat dissipation pipe (171) is connected to a heat dissipation shell (174) through a connecting pipe (173). A heat dissipation fan (175) is provided on one side of the heat dissipation shell (174). A protective net (176) fixed to the heat dissipation shell (174) is provided on the outside of the heat dissipation fan (175).

5. A biogas cold drying and dehydration machine with adjustable biogas outlet temperature as described in claim 1, characterized in that, The drain pipe (111) is provided with a water trap (112), and the end of the drain pipe (111) is provided with a control valve (113) and a check valve (114).

6. A biogas cold drying and dehydration machine with adjustable biogas outlet temperature as described in claim 4, characterized in that, Below the drain pipe (111) is a water receiving trough (21) that is fixedly connected to the support frame (2). The end of the water receiving trough (21) is connected to a water collection trough (22). A liquid pump (23) is provided in the water collection trough (22). A water spray head (24) is provided on one side of the heat dissipation shell (174). The liquid pump (23) and the water spray head (24) are connected by a water pipe (25).

7. A biogas cold drying and dehydration machine with adjustable biogas outlet temperature as described in claim 1, characterized in that, The refrigerant tank (13) is equipped with a pressure gauge (132) and an inflation port (133), and a safety valve (134) is provided at the connection between the inflation port (133) and the refrigerant tank (13).

8. A biogas cold drying and dehydration machine with adjustable biogas outlet temperature as described in claim 1, characterized in that, The refrigerated drying box (11) includes an inner shell (115) and an outer shell (116), and an insulation layer (117) is provided between the inner shell (113) and the outer shell (114).

9. A biogas cold drying and dehydration machine with adjustable biogas outlet temperature as described in claim 1, characterized in that, The refrigerated drying box (11) includes an inner shell (115) and an outer shell (116), with an insulation layer (117) filling the space between the inner shell (113) and the outer shell (114).

10. The application of the biogas cold drying and dehydration machine with adjustable biogas outlet temperature as described in claim 1, characterized in that, The biogas cold drying and dehydration machine with adjustable biogas outlet temperature is used in the full-scale resource utilization of manure and sewage to perform cold drying and dehydration treatment on the biogas produced by manure fermentation.

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