Desorption device and method for VOCs (Volatile Organic Compounds) powdery adsorption material

Abstract

The invention discloses a desorption method and device for a VOCs (volatile organic compounds) powdery adsorption material. The device comprises a desorption circulation loop, the desorption circulation loop comprises a desorption mixing tower communicated with a discharge port of the raw material tank, a desorption filter communicated with a discharge port of the desorption mixing tower, a high-temperature storage tank communicated with a discharge port of the desorption filter, and a hot air circulation loop for conveying circulating hot air to the desorption filter; the cooling circulation loop comprises a cooling mixing tower, a cooling filter, a cooling fan and a cooling condenser, wherein the cooling mixing tower is communicated with a discharge hole of the high-temperature storage tank, and the cooling filter, the cooling fan and the cooling condenser are communicated with a discharge hole of the cooling mixing tower; the continuous desorption and cooling process of the powdery adsorption material is realized, and the continuous desorption and regeneration of the powdery adsorption material are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of environmental protection and hazardous waste disposal and regeneration technology, and particularly relates to a desorption method and device for VOCs powder adsorption material. BACKGROUND

[0002] In the current industrial organic pollutant emission and treatment process, microporous adsorption materials represented by activated carbon are widely used for enriching gaseous or liquid waste organic matter. The failed adsorption materials generated in this application process are mostly used as one-time application, generating secondary hazardous waste and consuming excessive cost. The recycling of adsorption materials has become an important and feasible means for enterprises or industries to reduce costs and consumption. Therefore, under this market demand, many adsorption material regeneration techniques have emerged.

[0003] In the above use field, in order to improve the purification efficiency and removal degree, powder adsorption material is widely used, and these adsorption materials are difficult to form a wind or liquid bed layer due to the particle size limitation, so that the conventional regeneration technique cannot realize continuous and effective desorption regeneration and further recycling application. SUMMARY

[0004] Therefore, the embodiment of the present application provides a desorption method and device for VOCs powder adsorption material to solve the problem that the powder adsorption material cannot be continuously desorbed and regenerated in the prior art.

[0005] In order to achieve the above purpose, the embodiment of the present application provides the following technical scheme:

[0006] The present application provides a desorption device for VOCs powder adsorption material, comprising:

[0007] A raw material tank loaded with powder adsorption material to be treated;

[0008] A desorption circulation loop comprising a desorption mixing tower in communication with the discharge port of the raw material tank, a desorption filter in communication with the discharge port of the desorption mixing tower, a high-temperature storage tank in communication with the discharge port of the desorption filter, and a hot air circulation loop for delivering circulating hot air to the desorption filter;

[0009] A cooling circulation loop comprising a cooling mixing tower in communication with the discharge port of the high-temperature storage tank, a cooling filter in communication with the discharge port of the cooling mixing tower, a cooling fan and a cooling condenser;

[0010] A finished product tank for receiving the final product generated by the cooling filter;

[0011] The raw material tank uniformly feeds materials to the desorption circulation loop; the high-temperature storage tank receives the intermediate high-temperature product generated by the desorption filter and uniformly feeds materials to the cooling circulation loop.

[0012] The desorption device provided by the application realizes the continuous desorption and cooling process of the powder adsorbent material by arranging the raw material tank, the desorption circulation loop, the cooling circulation loop and the finished product tank.

[0013] In some embodiments, the hot air circulation loop comprises a heat exchanger, a desorption condenser, a desorption fan and a heater.

[0014] The liquid outlet of the desorption condenser is communicated with the solvent tank, the air inlet of the desorption condenser is communicated with the desorption filter through the heat exchanger, and the air outlet of the desorption condenser is communicated with the desorption mixing tower through the desorption fan, the heat exchanger and the heater in sequence.

[0015] In some embodiments, an oxygen content detector is arranged on the hot air circulation loop and / or the cooling circulation loop.

[0016] In some embodiments, the particle size of the powder adsorbent material is less than or equal to 1mm.

[0017] The powder adsorbent material is dispersed and uniformly distributed on the filter material surface of the desorption filter in the desorption circulation loop by the circulating hot air to form a uniform air passing bed layer.

[0018] The powder adsorbent material is dispersed and uniformly distributed on the filter material surface of the cooling filter in the cooling circulation loop by the circulating cold air to form a uniform air passing bed layer.

[0019] In some embodiments, the powder adsorbent material is activated carbon, molecular sieve, silica gel or diatomite.

[0020] In some embodiments, the discharge valve of the raw material tank, the inlet valve and the discharge valve of the high-temperature storage tank and the inlet valve of the finished product tank are all pressure isolation valves.

[0021] In some embodiments, the temperature of the high-temperature circulating gas in the desorption circulation loop ranges from 120 to 300 DEG C.

[0022] The application further provides a desorption method based on the desorption device for the VOCs powder adsorbent material.

[0023] Loading materials into the raw material tank;

[0024] In the displacement mode, the desorption device is in standby state, and the valve B in the desorption circulation loop and the valve H in the cooling circulation loop are closed; the nitrogen valve N is opened to introduce low-pressure nitrogen to displace and expel oxygen, and the displacement gas is discharged through the pressure relief device; after the displacement is completed, the nitrogen valve N is closed, and the valve B in the desorption circulation loop and the valve H in the cooling circulation loop are opened;

[0025] In the desorption mode, the desorption fan and the heater are started to gradually heat the circulating hot air to the set temperature; the circulating hot air after reaching the set temperature passes through the desorption mixing tower, the desorption filter, the heat exchanger, the desorption condenser, the desorption fan, the heat exchanger in turn, and returns to the heater to complete the desorption circulation; the raw material tank uniformly feeds the powder-shaped adsorbent material to the desorption circulation loop at a set rate, and the powder-shaped adsorbent material is blown into the desorption mixing tower and mixed with the circulating gas, and then enters the desorption filter, is uniformly enriched on the filter surface to form a wind bed layer, and is swept by the high-temperature circulating gas for a certain time; the high-temperature circulating gas sweeps the powder-shaped adsorbent material to desorb the organic matter, and the organic matter is condensed into a liquid state in the desorption condenser, and the liquid organic matter is transferred to the solvent tank for storage; the powder-shaped adsorbent material on the surface of the desorption filter is blown off according to a period by controlling the gas backblowing valve C, and enters the high-temperature storage tank through the valve D for temporary storage;

[0026] In the cooling mode, the cooling fan and the desorption fan are started at the same time, and the circulating cold air passes through the cooling mixing tower, the cooling filter, the cooling fan, the cooling condenser in turn, and returns to the cooling mixing tower to complete the cooling circulation; the high-temperature storage tank feeds the powder-shaped adsorbent material to the cooling circulation loop at a set rate through the valve G, and the powder-shaped adsorbent material is blown into the cooling mixing tower and mixed with the circulating gas, and then enters the cooling filter, is uniformly enriched on the filter surface to form a wind bed layer, and is swept by the low-temperature circulating gas for a certain time; the powder-shaped adsorbent material on the surface of the cooling filter is blown off according to a period by controlling the gas backblowing valve K, and enters the finished product tank through the valve L to complete the desorption regeneration;

[0027] The raw material tank stops feeding, all the powder-shaped adsorbent materials in the device are desorbed and cooled, and are transferred to the finished product tank, all the feeding and discharging valves stop operating, the heater is closed, and the cooling fan is closed, and the circulating gas temperature in the desorption gas path is reduced to a set range, and the desorption fan is closed;

[0028] The desorption device is stopped.

[0029] In some embodiments, the raw material tank is filled with material, specifically including:

[0030] In the standby state or the running state of the desorption device, the raw material tank is filled with the powder-shaped adsorbent material to be regenerated through the charging port with a closed valve;

[0031] After charging, low pressure nitrogen is introduced through the nitrogen valve N of the raw material tank to replace the air in the raw material tank, and the charging port is closed.

[0032] In some embodiments, the method further comprises:

[0033] The oxygen content in the circulating gas during the operation of the desorption device is continuously monitored by an oxygen content meter arranged on the desorption circulating gas path and the cooling circulating gas path.

[0034] The pressure relief device arranged on the desorption circulating gas path and the cooling circulating gas path automatically releases pressure when the pipeline pressure reaches or exceeds the set limit value. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be obtained from the provided drawings without creative labor.

[0036] The structures, proportions, sizes, etc. shown in the specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and do not define the limiting conditions for the implementation of the present application, so they do not have technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.

[0037] Figure 1 The structural schematic diagram of the desorption device for VOCs powder adsorption material provided by the present application.

[0038] Explanation of reference signs:

[0039] 1-raw material tank, 2-desorption mixing column, 3-desorption filter, 4-high temperature storage tank, 5-heat exchanger;

[0040] 6-desorption condenser, 7-desorption fan, 8-heater, 9-solvent tank, 10-cooling mixing column;

[0041] 11-cooling filter, 12-finished product tank, 13-cooling fan, 14-cooling condenser, 15-oxygen content meter; 16-pressure relief device. DETAILED DESCRIPTION

[0042] The following embodiments of the present application are illustrated by way of specific examples, and other advantages and effects of the present application will be readily appreciated by those skilled in the art upon reading the disclosure. It is obvious that the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0043] In one embodiment, the present application provides a desorption device for VOCs powder adsorbent material, which comprises a raw material tank 1, a desorption circulation loop, a cooling circulation loop and a finished product tank 12; wherein the raw material tank 1 is loaded with powder adsorbent material to be treated, the desorption circulation loop comprises a desorption mixing tower 2 communicating with the discharge port of the raw material tank 1, a desorption filter 3 communicating with the discharge port of the desorption mixing tower 2, a high-temperature storage tank 4 communicating with the discharge port of the desorption filter 3, and a hot air circulation loop for circulating hot air to the desorption filter 3; the cooling circulation loop comprises a cooling mixing tower 10 communicating with the discharge port of the high-temperature storage tank 4, a cooling filter 11 communicating with the discharge port of the cooling mixing tower 10, a cooling fan 13 and a cooling condenser 14, and the finished product tank 12 is used to receive the final product generated by the cooling filter 11; the raw material tank 1 uniformly feeds the desorption circulation loop; the high-temperature storage tank 4 receives the intermediate high-temperature product generated by the desorption filter 3 and uniformly feeds the cooling circulation loop.

[0044] The raw material tank 1 can adopt various forms of storage devices, such as hoppers or storage bins, etc.; the communication modes of the components in the desorption circulation loop and the components in the cooling circulation loop adopt pipeline connection; the finished product tank 12 can adopt various forms of receiving devices, such as hoppers or storage bins.

[0045] The desorption device provided by the present application realizes the continuous desorption and cooling process of the powder adsorbent material by setting the raw material tank 1, the desorption circulation loop, the cooling circulation loop and the finished product tank 12, and realizes the continuous desorption regeneration of the powder adsorbent material.

[0046] The hot air circulation loop comprises a heat exchanger 5, a desorption condenser 6, a desorption fan 7 and a heater 8; wherein the liquid outlet of the desorption condenser 6 communicates with a solvent tank 9, the air inlet of the desorption condenser 6 communicates with the desorption filter 3 through the heat exchanger 5, and the air outlet of the desorption condenser 6 communicates with the desorption mixing tower 2 in sequence through the desorption fan 7, the heat exchanger 5 and the heater 8.

[0047] In the working process, the raw material tank 1 uniformly feeds the desorption circulation loop, the desorption filter 3 generates high-temperature desorption product, the high-temperature storage tank 4 receives the high-temperature desorption product and uniformly feeds the cooling circulation loop, the cooling filter 11 generates the final product, and the finished product tank 12 receives the final product. Figure 1The whole gas path runs in the counterclockwise direction, the desorption hot air passes through a desorption heater, a desorption mixing tower, a desorption filter, a desorption heat exchanger (heat transfer, temperature reduction), a desorption condenser (further temperature reduction, condensation), a fan, a desorption heat exchanger (heat transfer, temperature increase), and a desorption heater (further temperature increase to the required temperature), the whole gas path is half hot and half cold, and the heat exchangers serve as nodes. In this way, the heating, heat exchange and condensation processes of the circulating hot air are realized by setting the hot air circulation loop, the temperature and utilization rate of the hot air are improved, and the energy consumption is reduced.

[0048] The heat exchanger 5 in the hot air circulation loop can be a plate heat exchanger or a tube heat exchanger, the desorption condenser 6 can be a water-cooled condenser or an air-cooled condenser, the desorption fan 7 can be a centrifugal fan or an axial flow fan, and the heater 8 can be an electric heater or a gas heater.

[0049] Specifically, an oxygen content detector is arranged on the hot air circulation loop and / or the temperature reduction circulation loop. By arranging the oxygen content detector, the oxygen content in the hot air circulation loop and the temperature reduction circulation loop can be monitored in real time, the safety of the desorption and temperature reduction processes is ensured, and fire or explosion accidents are prevented.

[0050] Further, the particle size of the powdered adsorbent material is ≤1 mm, and the powdered adsorbent material includes but is not limited to activated carbon, molecular sieve, silica gel or diatomite. The powdered adsorbent material is dispersed and uniformly distributed on the filter material surface of the desorption filter 3 in the desorption circulation loop to form a uniform air passing bed layer, and the powdered adsorbent material is dispersed and uniformly distributed on the filter material surface of the temperature reduction filter 11 in the temperature reduction circulation loop to form a uniform air passing bed layer. By selecting a suitable particle size of the powdered adsorbent material, the powdered adsorbent material can be dispersed and uniformly distributed on the filter material surface in the desorption circulation loop and the temperature reduction circulation loop to form a uniform air passing bed layer, the desorption and temperature reduction effects are improved, and the product quality is ensured.

[0051] In some embodiments, the discharge valve of the raw material tank 1, the inlet and outlet valves of the high-temperature storage tank 4, and the inlet valve of the finished product tank 12 are pressure isolation valves. By arranging the pressure isolation valves, material leakage or cross contamination during transportation can be prevented, oxygen in the gas path is isolated, the normal operation of the desorption device is ensured, and the product quality is ensured.

[0052] In some embodiments, the temperature of the high-temperature circulating gas in the desorption circulation loop ranges from 120 to 300°C. By controlling the temperature range of the high-temperature circulating gas in the desorption circulation loop, the desorption effect of the powdered adsorbent material during the desorption process can be ensured, and the adsorbent material is prevented from being damaged or other adverse effects are avoided due to excessively high temperature.

[0053] In another aspect, the present application also provides a desorption method based on the desorption device for VOCs powdered adsorbent material as described above, the method comprising the following steps:

[0054] The raw material tank 1 is filled with material; the desorption device is in standby state or running state (that is, the raw material tank outlet valve A is a pressure isolation valve, so the loading can be carried out in the standby or running state of the device, and the nitrogen replacement can be carried out after each loading), the powdered adsorbent material raw material required for regeneration is filled into the raw material tank 1 through the loading port of the raw material tank 1 with a closed valve; after loading, low-pressure nitrogen is introduced through the nitrogen valve N of the raw material tank 1, and after replacing the air in the raw material tank 1, the loading port is closed;

[0055] In the replacement condition, the desorption device is in standby state, the valve B in the desorption circulation loop and the valve H in the cooling circulation loop are closed; the nitrogen valve N is opened, low-pressure nitrogen is introduced to displace and expel oxygen, and the displacement gas is discharged through the pressure relief device 16; after the displacement is completed, the nitrogen valve N is closed, and the valve B in the desorption circulation loop and the valve H in the cooling circulation loop are opened;

[0056] In the desorption condition, the desorption fan 7 and the heater 8 are started, and the circulating hot air is gradually heated to the set temperature; the circulating hot air after reaching the set temperature passes through the desorption mixing tower 2, the desorption filter 3, the heat exchanger 5, the desorption condenser 6, the desorption fan 7, the heat exchanger 5 in turn, and returns to the heater 8, completing the desorption circulation; the raw material tank 1 uniformly feeds the powdered adsorbent material to the desorption circulation loop at a set rate, the powdered adsorbent material is blown into the desorption mixing tower 2 and mixed with the circulating gas, and then enters the desorption filter 3, uniformly enriches on the surface of the filter material, forms a wind-passing bed layer, and is swept by high-temperature circulating gas for a certain time; the high-temperature circulating gas sweeps the powdered adsorbent material, and desorbs the organic matter, which is condensed into a liquid state in the desorption condenser 6, and the liquid organic matter is transferred to the solvent tank 9 for storage; the powdered adsorbent material on the surface of the desorption filter 3 is blown off according to a period by controlling the gas backblowing valve C, and enters the high-temperature storage tank through the valve D for temporary storage;

[0057] In the cooling operation condition, the cooling fan 13 is started, and the circulating cold air passes through the cooling mixing tower 10, the cooling filter 11, the cooling fan 13, the cooling condenser 14 in turn, and returns to the cooling mixing tower 10, completing the cooling circulation; the high-temperature storage tank feeds the powdered adsorbent material to the cooling circulation loop at a set rate through the valve G, the powdered adsorbent material is blown into the cooling mixing tower 10 and mixed with the circulating gas, and then enters the cooling filter 11, uniformly enriches on the surface of the filter material, forms a wind-passing bed layer, and is swept by low-temperature circulating gas for a certain time; the powdered adsorbent material on the surface of the cooling filter 11 is blown off according to a period by controlling the gas backblowing valve K, and enters the finished product tank 12 through the valve L, and the desorption regeneration is completed;

[0058] The raw material tank 1 stops feeding, the desorption and cooling of the powdered adsorbent material in the device is completed and the finished product tank 12 is switched in, all the inlet and outlet valves are stopped, the heater 8 is turned off and the cooling fan 13 is turned off, the circulating gas temperature in the desorption gas path is reduced to the set range, and the desorption fan 7 is turned off;

[0059] The desorption device is stopped.

[0060] The oxygen content in the circulating gas during the operation of the desorption device is continuously monitored by the oxygen content meter 15 arranged on the desorption circulating gas path and the cooling circulating gas path; when the pipeline pressure reaches or exceeds the set limit, the pressure relief device 16 arranged on the desorption circulating gas path and the cooling circulating gas path automatically releases pressure.

[0061] That is, the device is respectively provided with an oxygen content meter 15 on the desorption circulating gas path and the cooling circulating gas path to continuously monitor the oxygen content in the circulating gas during the operation of the device, thereby ensuring the safety of the operation. The device is respectively provided with a mechanical pressure relief device 16 on the desorption circulating gas path and the cooling circulating gas path, which automatically releases pressure when the pipeline pressure reaches or exceeds the set limit, thereby ensuring the safety of the pipeline during the operation of the device. The automatic pressure relief limit value can be set in the range of 5-30 kPa.

[0062] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above is only a specific embodiment of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made on the basis of the technical solutions of the present application should be included in the protection scope of the present application.

Claims

1. A desorption apparatus for VOCs powdered adsorbent material, characterized by, The method comprises the following steps: A raw material tank (1) is used to load the powdered adsorbent to be treated; A desorption circulation loop comprises a desorption mixing tower (2) connected with the discharge port of the raw material tank (1), a desorption filter (3) connected with the discharge port of the desorption mixing tower (2), a high-temperature storage tank (4) connected with the discharge port of the desorption filter (3), and a hot air circulation loop for circulating hot air to the desorption filter (3); A cooling circulation loop comprises a cooling mixing tower (10) connected with the discharge port of the high-temperature storage tank (4), a cooling filter (11) connected with the discharge port of the cooling mixing tower (10), a cooling fan (13), and a cooling condenser (14); A finished product tank (12) is used to receive the final product generated by the cooling filter (11); The raw material tank (1) uniformly feeds the desorption circulation loop; the high-temperature storage tank (4) receives the intermediate high-temperature product generated by the desorption filter (3) and uniformly feeds the cooling circulation loop.

2. The desorber device for VOCs powdered adsorbent material of claim 1, wherein, The hot air circulation loop comprises a heat exchanger (5), a desorption condenser (6), a desorption fan (7), and a heater (8); The desorption condenser (6) is connected with a solvent tank (9) through a liquid outlet, the air inlet of the desorption condenser (6) is connected with the desorption filter (3) through the heat exchanger (5), and the air outlet of the desorption condenser (6) is connected with the desorption mixing tower (2) through the desorption fan (7), the heat exchanger (5), and the heater (8) in sequence.

3. The desorber device for VOCs powdered adsorbent material of claim 2, wherein, An oxygen content detector is arranged on the hot air circulation loop and / or the cooling circulation loop.

4. The desorber device for VOCs powdered adsorbent material of claim 2, wherein, The particle size of the powdered adsorbent is less than or equal to 1 mm. In the desorption circulation loop, the powdered adsorbent is dispersed and uniformly distributed on the filter material surface of the desorption filter (3) by the circulating hot air to form a uniform air-passing bed layer. In the cooling circulation loop, the powdered adsorbent is dispersed and uniformly distributed on the filter material surface of the cooling filter (11) by the circulating cold air to form a uniform air-passing bed layer.

5. The desorber device for VOCs powdered adsorbent material according to any one of claims 1-4, characterized in that, The powdered adsorbent is activated carbon, molecular sieve, silica gel, or diatomite.

6. The desorber device for VOCs powdered adsorbent material according to any one of claims 1-4, characterized in that, The discharge valve of the raw material tank (1), the inlet valve and the discharge valve of the high-temperature storage tank (4), and the inlet valve of the finished product tank (12) are pressure isolation valves.

7. The desorber device for VOCs powdered adsorbent material according to any one of claims 1-4, characterized in that, The temperature of the high-temperature circulating gas in the desorption circulation loop ranges from 120 to 300℃.

8. A desorption method based on the desorption device for VOCs powdery adsorbent material according to any one of claims 1 to 7, characterized in that, The method comprises the following steps: The raw material tank (1) is loaded with material; In the replacement condition, the desorption device is in standby state, the valve B in the desorption circulation loop and the valve H in the cooling circulation loop are closed, the nitrogen valve N is opened, low-pressure nitrogen is introduced to replace and expel oxygen, and the replacement gas is discharged through the pressure relief device (16); after the replacement is completed, the nitrogen valve N is closed, and the valve B in the desorption circulation loop and the valve H in the cooling circulation loop are opened; In the desorption condition, start the desorption fan (7) and the heater (8), and gradually heat the circulating hot air to the set temperature; after reaching the set temperature, the circulating hot air passes through the desorption mixing tower (2), the desorption filter (3), the heat exchanger (5), the desorption condenser (6), the desorption fan (7), the heat exchanger (5) in turn, and returns to the heater (8), completing the desorption cycle; the raw material tank (1) uniformly feeds the material to the desorption circulation loop at the set rate, and the powdered adsorbent material is blown into the desorption mixing tower (2) and mixed with the circulating gas, and then enters the desorption filter (3), is uniformly enriched on the surface of the filter material, forms a wind bed layer, and is swept by the high-temperature circulating gas for a certain time; the high-temperature circulating gas sweeps the powdered adsorbent material, and desorbs the organic matter, and the organic matter is condensed into a liquid state in the desorption condenser (6), and the liquid organic matter is stored in the solvent tank (9); the powdered adsorbent material on the surface of the desorption filter (3) is blown off according to the period by controlling the gas backblowing valve C, and enters the high-temperature storage tank (4) through the valve D for temporary storage; In the cooling operation condition, start the cooling fan (13), and the circulating cold air passes through the cooling mixing tower (10), the cooling filter (11), the cooling fan (13), the cooling condenser (14) in turn, and returns to the cooling mixing tower (10), completing the cooling cycle; the high-temperature storage tank (4) feeds the material to the cooling circulation loop at the set rate through the valve G, and the powdered adsorbent material is blown into the cooling mixing tower (10) and mixed with the circulating gas, and then enters the cooling filter (11), is uniformly enriched on the surface of the filter material, forms a wind bed layer, and is swept by the low-temperature circulating gas for a certain time; the powdered adsorbent material on the surface of the cooling filter (11) is blown off according to the period by controlling the gas backblowing valve K, and enters the finished product tank (12) through the valve L, and the desorption regeneration is completed; The raw material tank (1) stops feeding, all the powdered adsorbent materials in the device are completely desorbed and cooled, and are transferred to the finished product tank (12), all the feeding and discharging valve actions are stopped, the heater (8) and the cooling fan (13) are closed, and the circulating gas temperature in the desorption gas path is reduced to the set range, and the desorption fan (7) is closed; The desorption device is stopped.

9. The desorption method according to claim 8, characterized by, The raw material tank (1) is filled with material, specifically including: In the standby state or the running state of the desorption device, the powdered adsorbent material raw material is filled into the raw material tank (1) through the filling port of the raw material tank (1) with a closed valve; After filling, low-pressure nitrogen is introduced through the nitrogen valve N of the raw material tank (1), and after replacing the air in the raw material tank (1), the filling port is closed.

10. The desorption method of claim 8, wherein, The method further includes: The oxygen content in the circulating gas in the desorption device running process is continuously monitored through the oxygen content meter (15) arranged on the desorption circulation gas path and the cooling circulation gas path; When the pipeline pressure reaches or exceeds the set limit value, the pressure relief device (16) arranged on the desorption circulation gas path and the cooling circulation gas path automatically releases pressure.

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