An integrated adsorption-vacuum desorption device for organic waste gas with high boiling point

Abstract

The utility model discloses a kind of organic waste gas adsorption-vacuum desorption integrated device with high boiling point, comprising: adsorption tank, the inner chamber of the adsorption tank is equipped with heat pipe and adsorption component;The adsorption component is set along the axial direction of adsorption tank, and annular space is formed between adsorption component and the inner wall of adsorption tank;The heat pipe is located at the annular space;Steam heating system, the steam heating system includes steam generator, the gas outlet of the steam generator is connected with the import of the heat pipe, and the liquid inlet of steam generator is connected with the outlet of heat pipe. Realize wall type heat exchange, reduce condensing energy consumption;Steam heat exchange condenses into water and returns to steam generator for internal circulation use;Heating is uniform and efficient, desorption efficiency is improved, steam generator in plant operation can be used, without additional preparation and recovery cost, the utility model has the advantages of uniform heating, reducing energy consumption of rear-end condensing system, more environmental protection.

Description

Technical Field

[0001] This application relates to the field of volatile organic compound (VOCs) treatment and resource recovery technology, specifically to an integrated adsorption-vacuum desorption device for high-boiling-point organic waste gas. Background Technology

[0002] In industrial production processes, the emission of volatile organic compounds (VOCs) not only wastes resources but also seriously pollutes the environment. Adsorption-vacuum desorption, a highly efficient VOCs treatment technology, enriches target substances through the adsorption properties of the adsorption medium and then achieves desorption and regeneration through vacuum environment control. It has been widely applied in chemical, printing, and painting industries.

[0003] In existing vacuum desorption processes using adsorption media, heating with hot nitrogen is typically employed to improve the desorption efficiency of high-boiling-point VOCs. However, this technology has significant drawbacks: hot nitrogen, as a carrier gas, introduces additional sensible heat, causing it to enter the condensation system along with the desorption gas. The condensation system must simultaneously cool both the target material and the hot nitrogen, significantly increasing its cooling load. Furthermore, uneven flow of hot nitrogen within the adsorption tank can lead to uneven temperature distribution, resulting in insufficient heating of the activated carbon and incomplete desorption in some areas, affecting regeneration efficiency. Additionally, the preparation and transport of hot nitrogen require extra energy, increasing process operating costs. Utility Model Content

[0004] Therefore, there is a need to provide an integrated adsorption-vacuum desorption device for high-boiling-point organic waste gas to solve the problems in the existing technology where hot nitrogen is directly introduced for heating during desorption, which easily leads to uneven heating and insufficient desorption. Hot nitrogen can easily enter the condensation system with the desorbed gas, increasing the refrigeration load. In addition, the preparation and recovery of hot nitrogen will increase costs.

[0005] To achieve the above objectives, the inventors provide an integrated adsorption-vacuum desorption device for high-boiling-point organic waste gases, comprising:

[0006] An adsorption tank is provided with several sets of heat-conducting pipes and adsorption components in its inner cavity; the heat-conducting pipes are arranged in an S-shape along the axial direction of the adsorption tank; the several sets of heat-conducting pipes are arranged sequentially along one radial direction of the adsorption tank; the adsorption components include granular adsorption elements, which cover the heat-conducting pipes.

[0007] A steam heating system, comprising a steam generator and a steam distributor, wherein the outlet of the steam generator is connected to the outlet of the steam distributor, the outlet of the steam distributor is connected to the inlet of several sets of heat-conducting pipes through several distribution pipes, and the liquid inlet of the steam generator is connected to the outlet of several sets of heat-conducting pipes.

[0008] In some embodiments, the outer wall of the heat pipe is provided with heat-conducting fins.

[0009] In some embodiments, the steam heating system further includes a steam regulating valve located between the outlet of the steam generator and the inlet of the steam distributor.

[0010] In some embodiments, it also includes:

[0011] The control system includes a controller and a temperature detection unit. The temperature detection unit is located at the adsorption tank and is used to detect the temperature inside the adsorption tank. The controller is connected to the temperature detection unit and a steam regulating valve and is used to receive the detection signal from the temperature detection unit and regulate the steam regulating valve.

[0012] In some embodiments, the outer wall of the adsorption tank is covered with an insulation layer.

[0013] In some embodiments, it also includes:

[0014] A cooling system, comprising a cooling tower, wherein the outlet of the cooling tower is connected to the inlet of a steam distributor via a first valve, and the inlet of the cooling tower is connected to the outlet of a heat-conducting pipe via a second valve; and the inlet of the steam generator is connected to the outlet of the heat-conducting pipe via a third valve.

[0015] In some embodiments, it also includes:

[0016] A vacuum system, connected to the adsorption tank, is used to evacuate the adsorption tank to a vacuum.

[0017] In some embodiments, it also includes:

[0018] A condensation recovery system, which is connected to the adsorption tank, is used to condense the desorbed gas released from the adsorption tank.

[0019] Unlike existing technologies, the above-described integrated adsorption-vacuum desorption device for high-boiling-point organic waste gas utilizes a steam generator to introduce steam into heat-conducting pipes within the adsorption tank, achieving indirect heat exchange. This steam heats the adsorption components, and because the steam remains within the heat-conducting pipes and does not directly enter the adsorption tank, it avoids mixing with the desorbed gas and entering the condensation system. This eliminates the additional sensible heat carried in by the carrier gas, reducing the condensation system's cooling capacity requirement by 30-50%, thus lowering condensation energy consumption and significantly saving operating costs. Furthermore, the elimination of nitrogen introduction reduces waste gas emissions, and the vacuum environment lowers VOCs. The flash point, combined with low-temperature condensation, avoids the risk of high-temperature combustion and explosion, making operation safer. The condensed water after steam heat exchange is then recycled back into the steam generator, making it more environmentally friendly. The heat-conducting pipes are arranged in an S-shape, gradually bending along the axis of the adsorption tank, and several sets of heat-conducting pipes are arranged sequentially along the circumference of the adsorption tank. These sets of heat-conducting pipes are connected to the inlets of several sets of heat-conducting pipes via a steam distributor, allowing for simultaneous steam input to multiple sets of heat-conducting pipes. The heat-conducting pipes are positioned in an annular space between the adsorption components and the inner wall of the adsorption tank, which improves heating efficiency, ensuring uniform and efficient heating. The heating uniformity of the granular adsorbent is improved by more than 30%, and the desorption efficiency is increased by 10-15%. Therefore, this integrated adsorption-vacuum desorption device for high-boiling-point organic waste gas achieves uniform heating and efficient desorption of granular adsorbents, while reducing the energy consumption of the downstream condensation system. It can utilize the steam generator already in operation within the plant, eliminating the need for additional preparation and recycling costs.

[0020] The above description of the utility model is merely an overview of the technical solution of this application. In order to enable those skilled in the art to better understand the technical solution of this application and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this application easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this application. Attached Figure Description

[0021] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of specific embodiments of this application and other related content, and should not be considered as limitations on this application.

[0022] In the accompanying drawings of the instruction manual:

[0023] Figure 1 This is a partial view of an integrated adsorption-vacuum desorption device for high-boiling-point organic waste gas, as described in a specific embodiment.

[0024] Figure 2 This is a perspective view of the adsorption tank described in the specific embodiment;

[0025] Figure 3 This is a top internal view of the adsorption tank described in the specific embodiment;

[0026] Figure 4 This is a top external view of the adsorption tank described in the specific embodiment;

[0027] Figure 5 This is a structural diagram of an integrated adsorption-vacuum desorption device for high-boiling-point organic waste gas, as described in a specific embodiment.

[0028] The reference numerals used in the above figures are explained as follows:

[0029] 1. Adsorption tank;

[0030] 100. Heat pipe;

[0031] 2. Steam generator;

[0032] 3. Steam regulating valve;

[0033] 4. Steam distributor;

[0034] 400. Distribution pipe;

[0035] 5. Return pipe;

[0036] 6. Vacuum pump;

[0037] 7. Vacuum buffer tank;

[0038] 8. Vacuum valves;

[0039] 9. Condenser;

[0040] 10. Gas-liquid separator;

[0041] 11. Solvent storage tank;

[0042] 12. Refrigeration unit;

[0043] 13. Cooling tower;

[0044] 14. First valve;

[0045] 15. Second valve;

[0046] 16. Third valve. Detailed Implementation

[0047] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0048] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0049] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0050] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0051] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0052] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0053] As understood in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0054] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0055] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0056] In existing vacuum desorption processes using adsorption media, heating with hot nitrogen is typically employed to improve the desorption efficiency of high-boiling-point VOCs. However, this technology has significant drawbacks: hot nitrogen, as a carrier gas, introduces additional sensible heat, causing it to enter the condensation system along with the desorption gas. The condensation system must simultaneously cool both the target material and the hot nitrogen, significantly increasing its cooling load. Furthermore, uneven flow of hot nitrogen within the adsorption tank can lead to uneven temperature distribution, resulting in insufficient heating of the activated carbon and incomplete desorption in some areas, affecting regeneration efficiency. Additionally, the preparation and transport of hot nitrogen require extra energy, increasing process operating costs.

[0057] To address this, this invention provides an integrated adsorption-vacuum desorption device for high-boiling-point organic waste gas. It enriches the target substance through the adsorption properties of granular adsorbents and then achieves desorption and regeneration through vacuum environment control. In particular, it overcomes the defects of existing granular adsorbent vacuum desorption processes, such as high condensation energy consumption and uneven heating caused by hot nitrogen heating. By adopting a partitioned heat exchange, it achieves uniform heating and efficient desorption of granular adsorbents, while reducing the energy consumption of the downstream condensation system. Furthermore, it eliminates the need for additional preparation and recycling, thus reducing the process operating cost.

[0058] Please see Figure 1In a specific embodiment, the integrated adsorption-vacuum desorption device for high-boiling-point organic waste gas includes an adsorption tank 1 and a steam heating system. The inner cavity of the adsorption tank 1 is provided with several sets of heat-conducting pipes 100 and adsorption components. Please refer to [link to relevant documentation]. Figure 2 The heat-conducting pipe 100 is arranged in an S-shape, gradually bending along the axial direction of the adsorption tank; please refer to... Figure 3 Several sets of heat-conducting pipes are arranged sequentially along one radial direction of the adsorption tank; the adsorption assembly includes granular adsorption elements, which cover the area around the heat-conducting pipes. Through this arrangement, the heat-conducting pipes 100 can be evenly distributed in the annular space to uniformly heat the inner cavity of the adsorption tank 1, achieving the effect of uniformly heating the adsorption assembly.

[0059] The steam heating system includes a steam generator and a steam distributor. The outlet of the steam generator is connected to the outlet of the steam distributor. The outlet of the steam distributor is connected to the inlet of several sets of heat-conducting pipes through several distribution pipes. The liquid inlet of the steam generator is connected to the outlet of several sets of heat-conducting pipes. The integrated adsorption-vacuum desorption device for high-boiling-point organic waste gas introduces steam into the heat-conducting pipes 100 installed in the adsorption tank 1 through the steam generator 2, achieving indirect heat exchange. The adsorption components are heated through steam heat exchange. The steam is inside the heat-conducting pipes 100 and does not directly enter the adsorption tank 1, thus avoiding mixing with the desorbed gas and entering the condensation system. This eliminates the additional sensible heat brought in by the carrier gas, reducing the condensation system's cooling capacity requirement by 30-50%, reducing condensation energy consumption, and significantly saving operating costs. The absence of nitrogen reduces waste gas emissions, and the vacuum environment reduces VOCs. The flash point, combined with low-temperature condensation, avoids the risk of high-temperature combustion and explosion, making operation safer. The steam heat exchange is condensed into water and then flows back into the steam generator 2 for recycling, which is more environmentally friendly. The heat conduction pipe 100 is arranged in an S-shape along the axial direction of the adsorption tank 1, and several sets of heat conduction pipes are arranged sequentially along the circumference of the adsorption tank. They are connected to the inlet of several sets of heat conduction pipes through a steam distributor, which can realize the synchronous input of steam into multiple sets of heat conduction pipes. The heat conduction pipes are arranged between the adsorption component and the inner wall of the adsorption tank to form an annular space, which can improve the heating efficiency, making the heating uniform and efficient. The heating uniformity of the particulate adsorption element is improved by more than 30%, and the desorption efficiency is improved by 10-15%.

[0060] Therefore, the integrated adsorption-vacuum desorption device for high-boiling-point organic waste gas achieves uniform heating and efficient desorption of particulate adsorbents, while reducing the energy consumption of the downstream condensation system. It can utilize the steam generator 2 operating in the plant, eliminating the need for additional preparation and recycling costs.

[0061] The adsorption tank 1 is a sealed cylindrical container. The adsorption assembly also includes a support frame located at the bottom of the inner cavity of the adsorption tank 1. The adsorption tank 1 has an inlet, through which granular adsorbents are placed into the adsorption tank, supported by the support frame, filling the inner cavity of the adsorption tank and surrounding the heat-conducting pipe. The granular adsorbents include resin, activated carbon, or zeolite molecular sieves.

[0062] The top of the adsorption tank 1 is equipped with a waste gas inlet, a vacuum extraction port, and a temperature sensor interface. The waste gas to be adsorbed enters the adsorption tank 1 through the waste gas inlet. The vacuum extraction port is used to connect to a vacuum system to evacuate the adsorption tank 1 to a vacuum. The vacuum extraction port is also used to connect to a condensation system so that the desorbed gas is transported to the condensation system for processing. The temperature sensor interface is used to connect a temperature sensor. The bottom of the adsorption tank 1 is equipped with a purified gas outlet, a condensate drain outlet, and a pressure sensor interface. The purifier after the waste gas has been adsorbed and purified discharges the waste gas through the purified gas outlet. The condensate drain outlet is used to discharge condensate.

[0063] Please see Figure 4 The inlet of the steam distributor 4 is connected to the outlet of the steam generator 2. The steam distributor 4 is connected to the inlet of several sets of heat-conducting pipes 100 through several distribution pipes 400, which can realize the synchronous input of steam into multiple sets of heat-conducting pipes 100, thereby improving the heating efficiency.

[0064] In some embodiments, the outer wall of the heat pipe 100 is provided with heat-conducting fins to increase the heat exchange area, thereby improving heat exchange efficiency and uniform heating.

[0065] In a further embodiment, the heat-conducting fins are radial fins that surround the heat-conducting pipe 100.

[0066] In some embodiments, a plurality of heat-conducting fins are sequentially arranged along the axial direction of the heat-conducting pipe 100.

[0067] In some embodiments, the heat-conducting fins are welded to the heat-conducting pipe.

[0068] Please see Figure 1 In some embodiments, the steam heating system further includes a steam regulating valve 3, which is located between the outlet of the steam generator 2 and the inlet of the steam distributor 4. The steam regulating valve 3 enables on / off or proportional regulation to adjust various process parameters such as the flow rate, pressure, and temperature of the pipeline medium. In this application, the steam temperature is adjusted via the steam regulating valve 3, allowing for precise control of the heating power.

[0069] In some embodiments, the steam regulating valve 3 is located upstream of the steam distributor 4, and the steam is regulated by the steam regulating valve 3 and then distributed to the heat pipe 100 by the steam distributor 4.

[0070] In some embodiments, the outlet of the heat pipe 100 is connected to the inlet of the steam generator 2 via a return pipe 5 to achieve the return and recycling of condensate.

[0071] The steam generator 2 produces saturated steam (temperature adjustable from 80-150℃), which enters the steam distributor 4 through the steam regulating valve 3. It is connected to the heat conduction pipe 100 in the adsorption tank 1 through the distribution pipe 400 to achieve indirect heat exchange. The condensate after heat exchange is returned to the steam generator 2 for recycling through the return pipe 5.

[0072] In some embodiments, the outer wall of the adsorption tank 1 is covered with an insulation layer, which can reduce heat loss.

[0073] Please see Figure 5 In some embodiments, a cooling system is also included, comprising a cooling tower 13. The outlet of the cooling tower 13 is connected to the inlet of the steam distributor via a first valve 14, and the inlet of the cooling tower 13 is connected to the outlet of the heat pipe via a second valve 15. The inlet of the steam generator is connected to the outlet of the heat pipe via a third valve 16. When adsorption is required, the steam regulating valve and the third valve 16 are closed, and the first valve 14 and the second valve 15 are opened. The steam generator stops outputting steam to the heat pipe, and the cooling tower 13 supplies coolant to the heat pipe to cool the adsorption assembly. When desorption is required, the first valve 14 and the second valve 15 are closed, and the steam regulating valve and the third valve 16 are opened. The cooling tower 13 stops supplying coolant to the heat pipe, and the steam generator outputs steam to the heat pipe to heat the adsorption assembly.

[0074] In some embodiments, the integrated adsorption-vacuum desorption device for high-boiling-point organic waste gas further includes a vacuum system connected to the adsorption tank 1 for evacuating the adsorption tank 1 to a vacuum.

[0075] Please see Figure 5 In a further embodiment, the vacuum system includes a vacuum pump 6, a vacuum buffer tank 7, and a vacuum valve 8. The vacuum pump 6 is connected to the vacuum buffer tank 7 and the vacuum extraction port at the top of the adsorption tank 1 through a vacuum pipe. The vacuum buffer tank 7 is used to stabilize the vacuum level of the system. The vacuum valve 8 can adjust the vacuum level in the adsorption tank 1 to 0.01-0.08 MPa absolute pressure to meet the desorption requirements of different VOCs.

[0076] With the synergistic effect of vacuum and wall heating, the desorption rate of high-boiling-point VOCs (such as o-xylene) can reach over 95%, and the purity of the recovered solvent is ≥97%, thus realizing resource recycling.

[0077] In some embodiments, the integrated adsorption-vacuum desorption device for high-boiling-point organic waste gas further includes a condensation recovery system connected to the adsorption tank 1 for condensing the desorbed gas released from the adsorption tank 1.

[0078] Please see Figure 5 In a further embodiment, the condensation recovery system includes a condenser 9, a gas-liquid separator 10, a solvent storage tank 11, and a refrigeration unit 12. The refrigeration unit 12 is connected to the condenser 9, the inlet of the condenser 9 is connected to the vacuum extraction port of the adsorption tank 1, the outlet of the condenser 9 is connected to the gas-liquid separator 10, and the gas-liquid separator 10 is connected to the solvent storage tank 11. The gaseous mixture containing VOCs generated during desorption enters the condenser 9 from the vacuum extraction port of the adsorption tank 1. After being cooled by the refrigeration unit 12 (the condensation temperature is set to 5-40℃ according to the saturated vapor pressure of VOCs), the VOCs vapor liquefies. The liquid solvent separated by the gas-liquid separator 10 is stored in the solvent storage tank 11, and the non-condensable gases are discharged after tail gas treatment to meet emission standards.

[0079] In some embodiments, the integrated adsorption-vacuum desorption device for high-boiling-point organic waste gas further includes a control system. The control system includes a controller and a temperature detection unit. The temperature detection unit is located at the adsorption tank 1 and is used to detect the temperature inside the adsorption tank 1. The controller is connected to the temperature detection unit and the steam regulating valve 3 and is used to receive the detection signal from the temperature detection unit and adjust the steam regulating valve 3. Based on the detection signal, the controller adjusts the steam regulating valve 3 to regulate the temperature of the steam.

[0080] In some embodiments, the control system further includes a pressure detection unit, and the controller is also connected to the pressure detection unit, the steam regulating valve 3, the vacuum valve 8 and the refrigeration unit to monitor the temperature, pressure and condensation temperature inside the tank in real time. The controller automatically adjusts the operating parameters of each system through a preset program to achieve automated control of the adsorption-desorption process with a high degree of automation.

[0081] In a further embodiment, the control system adopts a PLC controller. The PLC control system adjusts the temperature, pressure and condensation parameters in real time, adapts to different VOCs characteristics, and is convenient to operate and highly stable.

[0082] In some embodiments, the temperature detection unit is a temperature sensor, and the temperature sensor is connected to the temperature sensor interface.

[0083] In some embodiments, the pressure detection unit is a pressure sensor, and the pressure sensor is connected to the pressure sensor interface.

[0084] The integrated adsorption-vacuum desorption device for high-boiling-point organic waste gas includes an adsorption stage and a desorption stage, and the specific steps are as follows:

[0085] 1. Adsorption stage

[0086] Close the vacuum extraction port and the valves of the steam heating system, and open the cooling system and its valves, as well as the exhaust gas inlet and purified gas outlet valves. The VOC-containing exhaust gas enters adsorption tank 1 at atmospheric pressure (or a slight positive pressure of 0.1-0.15 MPa), where it comes into full contact with the granular adsorbent. The granular adsorbent utilizes its microporous structure and surface forces to adsorb VOCs from the exhaust gas, and the purified gas is discharged from the bottom purified gas outlet. The adsorption capacity of the granular adsorbent is monitored in real time by a PLC. When the set saturation value is reached, adsorption stops and the desorption stage begins.

[0087] 2. Desorption stage

[0088] Once the adsorption tank is saturated, the device automatically switches to the desorption process via PLC.

[0089] Preheating preparation: Close the valves of the exhaust gas inlet and the purified gas outlet, close the cooling system and its valves, turn on the steam heating system, and the saturated steam generated by the steam generator 2 enters the adsorption tank 1 through the heat transfer pipe 100. The particulate adsorbent is uniformly heated to the set temperature (80-120℃, adjusted according to the boiling point of VOCs) through the indirect heat exchange (heat transfer enhanced by heat transfer fins), and kept at the temperature for 10-20 minutes.

[0090] Vacuum desorption: Activate the vacuum system to reduce the pressure inside adsorption tank 1 to 0.01-0.08 MPa absolute pressure, while maintaining heating. Under the combined effect of vacuum and temperature, VOCs molecules adsorbed by the particulate adsorbent overcome the adsorption force and desorb into the gas phase, forming a gas-phase mixture containing VOCs.

[0091] Condensation recovery: The gas mixture enters the condenser 9 through the vacuum pump port and is cooled to the condensation temperature by the refrigeration unit 12. After the VOCs vapor is liquefied, it enters the gas-liquid separator 10. The separated liquid solvent is stored in the solvent storage tank 11, and the non-condensable gases are discharged after treatment.

[0092] Regeneration complete: After desorption continues for 30-60 minutes, turn off the steam heating system, maintain vacuum and cool for 10-15 minutes, then break the vacuum, the particulate adsorbent will regain its adsorption capacity and can enter the next adsorption cycle.

[0093] Saturated steam is used for steam heating, and the heating temperature is controlled by steam regulating valve 3. The holding time is 10-20 minutes, and the vacuum desorption lasts for 30-60 minutes. The condensation temperature of the condensation recovery system is set according to the saturated vapor pressure of VOCs to ensure that the partial pressure of VOCs vapor is ≥ the saturated vapor pressure at that temperature.

[0094] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. An integrated adsorption-vacuum desorption device for high-boiling-point organic waste gases, characterized in that, include: An adsorption tank is provided with several sets of heat-conducting pipes and adsorption components in its inner cavity; the heat-conducting pipes are arranged in an S-shape along the axial direction of the adsorption tank; the several sets of heat-conducting pipes are arranged sequentially along one radial direction of the adsorption tank; the adsorption components include granular adsorption elements, which cover the heat-conducting pipes. A steam heating system, comprising a steam generator and a steam distributor, wherein the outlet of the steam generator is connected to the outlet of the steam distributor, the outlet of the steam distributor is connected to the inlet of several sets of heat-conducting pipes through several distribution pipes, and the liquid inlet of the steam generator is connected to the outlet of several sets of heat-conducting pipes.

2. The integrated adsorption-vacuum desorption device for high-boiling-point organic waste gas according to claim 1, characterized in that, The outer wall of the heat pipe is provided with heat-conducting fins.

3. The integrated adsorption-vacuum desorption device for high-boiling-point organic waste gas according to claim 1, characterized in that, The steam heating system also includes a steam regulating valve, which is located between the outlet of the steam generator and the inlet of the steam distributor.

4. The integrated adsorption-vacuum desorption device for high-boiling-point organic waste gas according to claim 3, characterized in that, Also includes: The control system includes a controller and a temperature detection unit. The temperature detection unit is located at the adsorption tank and is used to detect the temperature inside the adsorption tank. The controller is connected to the temperature detection unit and a steam regulating valve and is used to receive the detection signal from the temperature detection unit and regulate the steam regulating valve.

5. The integrated adsorption-vacuum desorption device for high-boiling-point organic waste gas according to claim 1, characterized in that, The outer wall of the adsorption tank is covered with a heat insulation layer.

6. The integrated adsorption-vacuum desorption device for high-boiling-point organic waste gas according to claim 1, characterized in that, Also includes: A cooling system, comprising a cooling tower, wherein the outlet of the cooling tower is connected to the inlet of a steam distributor via a first valve, and the inlet of the cooling tower is connected to the outlet of a heat-conducting pipe via a second valve; and the inlet of the steam generator is connected to the outlet of the heat-conducting pipe via a third valve.

7. The integrated adsorption-vacuum desorption device for high-boiling-point organic waste gas according to claim 1, characterized in that, Also includes: A vacuum system, connected to the adsorption tank, is used to evacuate the adsorption tank to a vacuum.

8. The integrated adsorption-vacuum desorption device for high-boiling-point organic waste gas according to claim 1, characterized in that, Also includes: A condensation recovery system, which is connected to the adsorption tank, is used to condense the desorbed gas released from the adsorption tank.

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