Multi-stage toluene circulation purification system and its application

Abstract

This invention provides a multi-stage toluene circulation purification system and its application, relating to the field of organic waste gas treatment technology. The multi-stage toluene circulation purification system includes an activated carbon monitoring unit. This unit detects the desorption or cleaning / regeneration needs of the activated carbon. Based on the detection results, it determines whether to trigger a desorption or cleaning / regeneration operation on the activated carbon. This invention reduces the time and resource waste associated with unnecessary activated carbon regeneration processes, while ensuring timely regeneration of the activated carbon when its adsorption activity is insufficient. This maintains the activated carbon's adsorption activity at a good level, improving the overall effectiveness of the toluene waste gas adsorption process.

Description

Technical Field

[0001] This invention belongs to the field of organic waste gas treatment technology, and specifically relates to a multi-stage toluene circulation purification system and its application. Background Technology

[0002] Brominated epoxy resins possess excellent self-extinguishing properties, heat resistance, and low toxicity, and are also known as brominated epoxy resins. They are primarily used as various flame-retardant composite materials, structural materials, adhesives, and coatings, and are widely applied in the construction, aerospace, shipbuilding, and electronics industries.

[0003] Brominated epoxy resins include tetrabromobisphenol A epoxy resin, brominated phenolic epoxy resin, dibromopentaerythritol diglycidyl ether, N,N-diglycidyl-2,4,6-tribromoaniline, dibromotoluene glycidyl ether, 1,3-diglycidyl-4,5,6,7-tetrabromobenzimidazolone, etc., with important varieties being brominated bisphenol A epoxy resin and brominated phenolic epoxy resin.

[0004] Brominated epoxy resins possess many excellent properties, including excellent thermal and light stability, superior melting speed, and high flame retardant efficiency. In the electronics industry, brominated epoxy resins are used in relatively large quantities as potting materials. With the increasing concern about dioxins and migration issues arising while improving flame retardancy, brominated epoxy resins have once again attracted attention, especially high molecular weight brominated epoxy resins, which perform exceptionally well as flame retardants and exhibit good physical and mechanical properties for flame-retardant materials.

[0005] There are two main methods for synthesizing high molecular weight brominated epoxy resins: one-step and two-step methods. However, regardless of the synthesis method, some waste gas pollutants are inevitably generated.

[0006] Toluene, as a major component of exhaust gas pollutants, has a certain degree of toxicity and can be inhaled, ingested, or absorbed through the skin.

[0007] In summary, how to provide a device and method that can effectively purify toluene waste gas is a technical problem that urgently needs to be solved. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a multi-stage toluene circulation purification system and its application, which can detect the desorption or cleaning and regeneration needs of activated carbon and trigger the desorption or cleaning and regeneration operation of activated carbon based on the detection results, so that the activated carbon can more effectively adsorb toluene.

[0009] This invention provides a multi-stage toluene circulation purification system, including a waste gas adsorption device that uses activated carbon to purify residual waste gas;

[0010] The waste gas adsorption device includes an activated carbon monitoring unit and a desorption and regeneration triggering unit.

[0011] The activated carbon monitoring unit is used to detect the desorption requirement or the cleaning and regeneration requirement of activated carbon.

[0012] The desorption and regeneration triggering unit is used to determine, based on the detection results, whether to trigger a desorption operation on the aforementioned activated carbon or to trigger a cleaning and regeneration operation on the aforementioned activated carbon.

[0013] Furthermore, the waste gas adsorption device includes a base and a rotating drum; activated carbon is placed inside the rotating drum; the rotating drum includes a shaft passing through the rotating drum and extending out of the rotating drum at least at one end, the end of the shaft being rotatably connected to the aforementioned base.

[0014] Furthermore, a baffle is provided on the inner wall of the rotating drum, and the baffle protrudes from the inner wall surface of the rotating drum.

[0015] Furthermore, the waste gas adsorption device also includes a first heating structure; the heating structure includes a graphene heating layer laid on the inner wall of the rotating drum, used to heat the activated carbon to desorb the gas.

[0016] Furthermore, the waste gas adsorption device includes a regeneration component; the regeneration component contains supercritical carbon dioxide, which is used to clean and regenerate the activated carbon in the waste gas adsorption device.

[0017] Furthermore, the regeneration component is connected to the aforementioned rotating drum via a gate; the aforementioned desorption and regeneration triggering unit is configured to control the opening or closing of the gate based on the pressure change results fed back by the aforementioned pressure monitoring component. When the desorption and regeneration triggering unit opens the gate, supercritical carbon dioxide enters the rotating drum from the regeneration component, causing the aforementioned activated carbon to desorb toluene waste gas.

[0018] Furthermore, the activated carbon monitoring unit includes a first activated carbon activity monitoring mechanism for detecting the adsorption activity of the activated carbon placed inside the waste gas adsorption device. The first activated carbon activity monitoring mechanism includes a collection component, a first detection chamber, and a vacuum machine; the vacuum machine is used to evacuate the first detection chamber.

[0019] The acquisition component is used to acquire and transfer the activated carbon placed inside the waste gas adsorption device to the detection chamber; the first detection chamber includes a first desorption component, an organic waste gas release component, and a pressure monitoring component; wherein, the first desorption component is used to desorb the activated carbon transferred to the first detection chamber by the acquisition component; the organic waste gas release component is used to release a preset volume of organic waste gas, the activated carbon after desorption by the aforementioned first desorption component adsorbs the organic waste gas, and the pressure monitoring component is used to detect the pressure change in the first detection chamber during the adsorption process.

[0020] Furthermore, the sampling component is equipped with a second heating structure and a weighing component. The second heating structure heats the activated carbon to dry it, and the weighing component is used to weigh the dried activated carbon.

[0021] Furthermore, the activated carbon monitoring unit also includes a second activated carbon activity monitoring mechanism for detecting the adsorption activity of the activated carbon placed inside the waste gas adsorption device, including the aforementioned vacuum machine and the second detection chamber; the activated carbon placed inside the waste gas adsorption device is collected and transferred to the second detection chamber by the aforementioned collection component, and the second detection chamber is evacuated by the vacuum machine; the second detection chamber includes the aforementioned organic waste gas release component and the gas pressure monitoring component;

[0022] The second activated carbon activity monitoring mechanism also includes a second desorption component. The aforementioned desorption and regeneration triggering unit is configured to control the opening or closing of the second adsorption component based on the pressure change results fed back by the aforementioned pressure monitoring component. The activated carbon in the second detection chamber desorbs toluene waste gas through the second desorption component.

[0023] The present invention also provides a method for purifying toluene waste gas using the multi-stage toluene circulation purification system described in any one of the above claims, comprising an activated carbon adsorption device for purifying residual waste gas, and the method comprising the following steps:

[0024] The waste gas adsorption device is equipped with an activated carbon monitoring unit, which can be used to detect the desorption or cleaning and regeneration needs of the activated carbon.

[0025] Based on the test results, it was determined whether the aforementioned activated carbon was subjected to a desorption operation or a cleaning and regeneration operation.

[0026] By adopting the above technical solution, this invention, as an example, has the following advantages and positive effects compared with the prior art:

[0027] The activated carbon in the waste gas adsorption device adsorbs toluene waste gas, and the rotating drum ensures full contact between the activated carbon and the toluene waste gas, improving the adsorption effect. Supercritical carbon dioxide is used to simultaneously desorb and regenerate the activated carbon, thereby extracting toluene.

[0028] The first activated carbon activity detection mechanism can detect the adsorption activity of the activated carbon and, based on the detection results, control whether to trigger the supercritical carbon dioxide cleaning process. The second activated carbon activity monitoring mechanism can also detect the adsorption activity of the activated carbon and, based on the detection results, control whether to trigger the heating desorption process. This reduces the time and resource waste caused by unnecessary cleaning or desorption processes, while ensuring timely regeneration of the activated carbon when its adsorption activity is insufficient, thereby maintaining the adsorption activity of the activated carbon at a good level and ensuring the overall effectiveness of the adsorption process in the device of this invention.

[0029] The device has a simple overall structure and is easy to maintain. The carbon dioxide of different phases used can be recycled and reused, making it economical and environmentally friendly. The purification method using this device is easy to implement and green, making it suitable for large-scale promotion and application. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the multi-stage toluene circulation purification system provided by the present invention.

[0031] Figure 2 This is a schematic diagram of the structure of the waste gas adsorption device provided by the present invention.

[0032] Figure 3 This is a schematic diagram of the structure of the second activated carbon activity monitoring mechanism provided by the present invention.

[0033] Explanation of reference numerals in the attached figures

[0034] A multi-stage toluene circulation purification system 100, including pipelines 110, gate valves 120, activated carbon 130, and separation chambers 140; a first condensation chamber 200; a second condensation chamber 300; a third condensation chamber 400; a photocatalytic reactor 500; a waste gas adsorption device 600, a regeneration component 610, a rotating drum 611, a rotating shaft 612, a base 613, and a first heating structure 620; an activated carbon monitoring unit 700, a toluene release component 710, a gas pressure monitoring component 720, a collection component 730, a second heating structure 731, a weighing component 732, a first activated carbon activity monitoring mechanism 740, a first desorption component 741, a first detection chamber 742, a second activated carbon activity monitoring mechanism 750, a second detection chamber 751, a second desorption component 752, a vacuum machine 760; a desorption and regeneration triggering unit 800; and a waste liquid recovery component 900. Implementation

[0035] The technical solutions disclosed in this invention will be described in detail below with reference to specific embodiments.

[0036] Techniques and methods known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques and methods should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0037] In the description of this invention, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0038] The present invention provides a multi-stage toluene circulation purification system 100, including a condensation device.

[0039] like Figure 1 As shown, the condensation device is used to condense toluene waste gas, and includes a first condensation chamber 200, a second condensation chamber 300 and a third condensation chamber 400 arranged sequentially along the direction of toluene waste gas travel.

[0040] A refrigeration unit is installed in the condensation chamber for cooling. The toluene waste gas undergoes triple condensation treatment through the first, second, and third condensation chambers.

[0041] The precipitated waste liquid leaves the condensation system and enters the waste liquid recovery unit 900 through a pipeline to recover the condensed waste liquid precipitated from the aforementioned condensation system.

[0042] The multi-stage toluene circulation purification system also includes a waste gas adsorption device 600. In this embodiment, the waste gas adsorption device is located after the second condensation chamber and / or after the third condensation chamber along the direction of toluene waste gas travel.

[0043] The waste gas adsorption device contains activated carbon 130, which adsorbs toluene waste gas.

[0044] like Figure 2 As shown, the waste gas adsorption device includes a base 613 and a rotating drum 611. Activated carbon is placed inside the rotating drum in a dispersed state and can move freely within the drum. The rotating drum includes a shaft 612 that passes through it and extends at least one end out of the drum; the end of the shaft is rotatably connected to the base. A drive device drives the shaft to rotate relative to the base, thereby causing the drum to rotate around the shaft. As the waste gas adsorption device rotates, the activated carbon inside continuously rolls.

[0045] Optionally, an electrically driven fan is provided at or near the gas inlet inside the rotating drum. The fan's structure is prior art and is not shown in the accompanying drawings.

[0046] When a fan is installed at the gas inlet, the toluene waste gas is blown into the waste gas adsorption device by the rotating fan. The airflow generated by the fan can further disperse and change the position of the activated carbon in the waste gas adsorption device, so that the activated carbon can fully contact the toluene waste gas.

[0047] Preferably, a plurality of baffles are spirally arranged at intervals on the inner wall of the rotating drum, the baffles protruding relative to each other on the inner wall surface of the rotating drum. When the rotating drum rotates, the activated carbon inside rolls along with it, and some of the activated carbon falls onto the baffles, temporarily stopping its movement and thus separating from the activated carbon that has not fallen onto the baffles. The spaced baffles temporarily restrict some of the activated carbon, allowing it to gradually disperse during movement and fully contact the toluene waste gas.

[0048] Optionally, the waste gas adsorption device is equipped with a first heating structure 620, which can heat the activated carbon to desorb the gas. For example, using... Figure 2 For example, in one implementation method, a graphene heating layer can be provided on the inner wall of the rotating drum.

[0049] The waste gas adsorption device also includes a regeneration component 610, which contains supercritical carbon dioxide. The adsorption activity of activated carbon gradually weakens with increasing usage time. The activated carbon is washed with supercritical carbon dioxide to restore its adsorption activity.

[0050] When the temperature and pressure conditions are greater than 31 degrees Celsius and 7.3 MPa, carbon dioxide will exist in a supercritical fluid phase. Supercritical carbon dioxide has both gaseous and liquid properties and can rapidly dissolve organic matter.

[0051] In one typical implementation, the regeneration component and the waste gas adsorption device are connected via a gate 120. The opening and closing of the gate controls the connection and disconnection between the regeneration component and the waste gas adsorption device. The opening and closing of the gate is controlled by the desorption and regeneration triggering unit 800.

[0052] When the gate is opened, the supercritical carbon dioxide in the regeneration component flows into the waste gas adsorption device through the liquid delivery pipeline. At the same time, the rotating drum of the waste gas adsorption device maintains its rotation state, and the supercritical carbon dioxide and activated carbon in it move accordingly, making full contact and improving the extraction effect of supercritical carbon dioxide on the toluene waste gas adsorbed on the activated carbon, thereby enabling the activated carbon to desorb and regenerate.

[0053] In addition, with several baffles arranged in a spiral pattern inside the rotating drum, the spiral baffles rotating with the inner wall can also agitate the liquid, which can help mix supercritical carbon dioxide and activated carbon and improve the washing effect.

[0054] After desorption by activated carbon, supercritical carbon dioxide containing toluene waste gas flows into separation chamber 140, which is sequentially set after the waste gas adsorption device, through a liquid delivery pipeline. By reducing the pressure and raising / lowering the temperature of the supercritical carbon dioxide containing toluene waste gas, the supercritical fluid is transformed into ordinary gas or liquid, and the extracted substances are precipitated, thereby achieving the purpose of separation.

[0055] Optionally, carbon dioxide from ordinary gases is returned to the regeneration unit via pipeline and, after being subjected to set temperature and pressure conditions, is brought back to a supercritical state for recycling.

[0056] Alternatively, the carbon dioxide gas in the separation chamber can be directly discharged outdoors or into the waste liquid recovery assembly through pipes. Supercritical carbon dioxide is periodically replenished into the chamber of the regeneration assembly for subsequent use. Optionally, a sensor is installed at a preset liquid level within the chamber of the regeneration assembly. When the liquid level falls below the preset level, the sensor triggers an alarm, prompting the replenishment of supercritical carbon dioxide.

[0057] The process of triggering the supercritical carbon dioxide in the regeneration component to enter the waste gas adsorption device can be achieved by setting the gate to open at preset intervals to start the supercritical carbon dioxide cleaning process on the activated carbon.

[0058] Another typical implementation also includes a first activated carbon activity monitoring mechanism 740 for detecting the adsorption activity of the activated carbon placed inside the waste gas adsorption device. Based on different detection results of the activated carbon activity, it is determined whether to trigger the supercritical carbon dioxide in the regeneration component to enter the waste gas adsorption device. With this setup, when the activated carbon still maintains a high adsorption activity, it is not necessary to stop the adsorption process of the waste gas in the waste gas adsorption device to trigger the supercritical carbon dioxide cleaning process, thereby saving unnecessary time and resource waste caused by the additional cleaning process. At the same time, it can dynamically adjust the supercritical carbon dioxide cleaning process according to the actual wear and tear of the activated carbon during use, and promptly trigger the supercritical carbon dioxide cleaning process when the adsorption activity of the activated carbon is lower than the required level, restoring the adsorption activity of the activated carbon and ensuring the effect of waste gas adsorption.

[0059] like Figure 2 As shown, the first activated carbon activity monitoring mechanism 740 includes a collection component 730, a first detection chamber 742, and a vacuum machine 760.

[0060] The collection component is used to collect and transfer the activated carbon placed inside the waste gas adsorption device to the first detection chamber.

[0061] In this embodiment, as Figure 2 As shown, the collection component is mounted on a rotating drum included in the waste gas adsorption device, has a cavity, and is selectively connected to the rotating drum via a gate. When the gate is open, the collection component rotates with the rotating drum, and some activated carbon falls into the collection component. After the gate is closed, the activated carbon remains in the collection component, thus achieving sample collection of the activated carbon.

[0062] In another embodiment, the collection component is a conveyor channel with an internal conveyor belt, and the conveyor channel is connected to a rotating drum containing the activated carbon. The activated carbon is transported within the conveyor channel via the conveyor belt. Optionally, the conveyor belt is provided with several protrusions to limit and fix the activated carbon.

[0063] In another embodiment, the collection component is an inclined channel, one end of which is selectively connected to the waste gas adsorption device via a gate, and the other end is selectively connected to a detection chamber located below the waste gas adsorption device. When the gate is open, the activated carbon inside the waste gas adsorption device slides down under its own gravity.

[0064] In another embodiment, the collection component has a cavity structure, and its shape is not limited. For example, it can be a bucket or a shovel, and can be movably installed on the inner wall of the rotating drum.

[0065] In other methods, the collection component can also be set as a mechanical claw, which can extend into the area where the activated carbon is located to perform a grasping and collection operation.

[0066] In practical applications, the number of sampling components can also be set to multiple, and different sampling components can adopt different implementation structures and correspond to different sampling methods.

[0067] In addition, to ensure the quality of the collected samples and improve the accuracy of the detection, a heating structure can be provided on the collection component at the position corresponding to the sample contact point. For example, in this embodiment, a second heating structure 731 is provided on the inner wall of the collection component 730 with a cavity, and the activated carbon is heated by the second heating structure to dry it. Furthermore, a weighing component 732 can also be provided inside the collection component to weigh the activated carbon sample inside the collection component, and the location of the weighing component is not limited to the bottom of the inner wall of the collection component.

[0068] Furthermore, the amount of sample can be controlled by weighing. For example, a preset sample weight value can be set for a single test. When the sample weight weighed by the weighing component exceeds a threshold, excess samples are removed, or when the sample weight is insufficient, the required amount of sample is added. Figure 2Taking the implementation method in the example, when the sample weight exceeds the threshold, the desorption and regeneration trigger unit opens the gate connecting the collection component and the rotating drum, allowing some of the activated carbon to roll into the rotating drum, and then closes the gate for weighing. When the sample weight is insufficient, the gate is opened, and the activated carbon in the rotating drum randomly falls into the cavity of the collection component.

[0069] The same principle applies to the collection components in other implementations. For example, a mechanical gripper can add or remove samples based on the feedback from the weighing component, or it can transfer more samples in the forward direction via a circular conveyor belt, or transport some of the collected samples back to the waste gas adsorption device in the reverse direction.

[0070] After the collected activated carbon sample enters the first detection chamber through the collection component, the gate at the connection between the first detection chamber and the collection component is closed, and the first detection chamber and the collection component are not connected and are in a sealed state.

[0071] The vacuum machine 760 is used to evacuate the first detection chamber.

[0072] The first detection chamber 742 includes a first desorption component 741, a toluene exhaust gas release component 710, and a pressure monitoring component 720.

[0073] The activated carbon collected by the collection component is transferred into the first detection chamber, where it is first desorbed by the first desorption component. For example, the activated carbon can be heated for a preset time to desorb toluene waste gas.

[0074] The toluene exhaust gas release assembly has a cavity pre-stored with toluene. Under the control of the desorption and regeneration trigger unit 800, it can release a preset volume of toluene into the first detection chamber. Different preset volumes of toluene released correspond to different initial gas pressures within the detection chamber.

[0075] The activated carbon after desorption treatment by the first desorption component adsorbs a preset volume of toluene released by the toluene release component, causing a change in the gas pressure inside the first detection chamber.

[0076] The pressure monitoring component is used to detect pressure changes within the first detection chamber during adsorption. Compared to when activated carbon has strong adsorption activity, when its adsorption activity is insufficient, the activated carbon's adsorption of a preset volume of toluene in the first detection chamber weakens, resulting in a smaller adsorption amount and thus a smaller pressure change within the first detection chamber. The desorption and regeneration triggering unit compares the pressure changes in the first detection chamber fed back by the pressure monitoring component with a preset waste gas pressure comparison table. This table records the corresponding pressure values ​​within the first detection chamber when activated carbon adsorbs different percentages of the total waste gas. For example, the pressure value corresponding to 60% adsorption of the total waste gas is different from the pressure value corresponding to 80% adsorption. The amount of toluene adsorbed by the activated carbon in the first detection chamber can be calculated from the measured pressure values.

[0077] When the change in gas pressure reaches a preset standard, for example, when the activated carbon adsorbs 60% or more of the total waste gas, the desorption and regeneration triggering unit determines that the activated carbon still has a high degree of activity. Conversely, when the activated carbon adsorbs less than 60% of the total waste gas, the desorption and regeneration triggering unit determines that the activated carbon has a low degree of activity, thus obtaining the determination result of the activated carbon adsorption activity.

[0078] When the activity level of activated carbon is low, the desorption and regeneration triggering unit triggers the regeneration component to perform a cleaning and regeneration operation on the activated carbon.

[0079] The desorption and regeneration triggering unit is configured to control the opening or closing of the gate based on the pressure change results fed back by the pressure monitoring component. Within a preset time, after activated carbon with the required adsorption activity adsorbs toluene, the range of pressure change values ​​in the first detection chamber is set as a judgment criterion.

[0080] When the pressure change in the first detection chamber is less than the specified range, the desorption and regeneration trigger unit opens the gate, and supercritical carbon dioxide enters the drum from the regeneration component, causing the activated carbon to desorb the toluene waste gas.

[0081] like Figure 3 As shown, in another embodiment, a second activated carbon activity monitoring mechanism 750 is also included to detect the adsorption activity of the activated carbon placed in the waste gas adsorption device. Based on different detection results of the activated carbon activity, it is determined whether to trigger the heating desorption operation of the activated carbon.

[0082] The second activated carbon activity monitoring mechanism includes the aforementioned vacuum machine 760 and the second detection chamber 751. The activated carbon placed inside the waste gas adsorption device is collected and transferred to the second detection chamber by the aforementioned collection component 730, and the second detection chamber is evacuated by the vacuum machine. The difference is that it does not include the first desorption component; instead of desorbing the activated carbon transferred by the collection component, it directly performs activity detection.

[0083] The second detection chamber is configured similarly to the first detection chamber, also including the aforementioned toluene waste gas release component 710 and pressure monitoring component 720. The toluene waste gas release component is used to release a preset volume of toluene waste gas, which is then adsorbed by untreated activated carbon. The pressure monitoring component is used to detect pressure changes within the second detection chamber during the adsorption process.

[0084] The second activated carbon activity monitoring mechanism also includes a second desorption component 752. The aforementioned desorption and regeneration triggering unit is configured to control the opening or closing of the second adsorption component based on the pressure change results fed back by the aforementioned pressure monitoring component. The process by which the desorption and regeneration triggering unit determines the activated carbon adsorption activity is similar to the process described above for determining the activated carbon adsorption activity in the first detection chamber. Both involve measuring the pressure change during the adsorption process to inversely calculate the percentage of toluene waste gas adsorbed by the activated carbon relative to the total waste gas volume, thereby obtaining the determination result of the activated carbon adsorption activity. Within a set time period, the higher the percentage of toluene waste gas adsorbed by the activated carbon relative to the total waste gas volume, the stronger the activated carbon adsorption activity, and vice versa.

[0085] When the desorption and regeneration triggering unit determines that the adsorption activity of the activated carbon in the second detection chamber is weak, it activates the second desorption component to desorb the toluene waste gas from the activated carbon in the second detection chamber.

[0086] Vacuuming will produce a certain desorption effect. In this case, the adsorption activity of activated carbon can be corrected by the desorption and regeneration triggering unit.

[0087] Optional, such as Figure 1 As shown, the multi-stage toluene circulation purification system 100 also includes a photocatalytic reactor 500 connected to the third condensation chamber, which is used to decompose and oxidize the toluene waste gas leaving the aforementioned third condensation chamber.

[0088] This invention provides a method for purifying toluene waste gas using a multi-stage toluene circulation purification system as described in any one of the above claims, comprising an activated carbon adsorption device for purifying residual waste gas, and including the following steps:

[0089] The waste gas adsorption device is equipped with an activated carbon monitoring unit, which can be used to detect the desorption or cleaning and regeneration needs of the activated carbon.

[0090] Based on the test results, it was determined whether the aforementioned activated carbon was subjected to a desorption operation or a cleaning and regeneration operation.

[0091] Within the scope of this disclosure, terms such as “comprising” should be interpreted by default as inclusive or open-ended, rather than exclusive or closed, unless expressly defined as such. All technical, scientific, or other terms shall be interpreted as understood by one of those skilled in the art, unless defined as such. Public terms found in dictionaries should not be interpreted in an overly idealistic or impractical manner in the context of the relevant technical documentation, unless expressly defined as such in this disclosure.

[0092] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0093] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-stage toluene circulation purification system, comprising a condensation device, including a first condensation chamber, a second condensation chamber, and a third condensation chamber arranged sequentially along the direction of toluene waste gas flow, characterized in that: It includes a waste gas adsorption device that purifies residual waste gas with activated carbon, the waste gas adsorption device being disposed after the second condensation chamber and / or after the third condensation chamber along the direction of toluene waste gas travel; The waste gas adsorption device includes an activated carbon monitoring unit and a desorption and regeneration triggering unit. The activated carbon monitoring unit is used to detect the desorption requirement or the cleaning and regeneration requirement of activated carbon. The activated carbon monitoring unit includes a first activated carbon activity monitoring mechanism for detecting the adsorption activity of activated carbon placed inside the waste gas adsorption device. The first activated carbon activity monitoring mechanism includes a collection component, a first detection chamber, and a vacuum machine. The vacuum machine is used to evacuate the first detection chamber. The collection component is used to collect and transfer the activated carbon placed inside the waste gas adsorption device to the detection chamber. The first detection chamber includes a first desorption component, an organic waste gas release component, and a pressure monitoring component. The first desorption component is used to desorb the activated carbon transferred to the first detection chamber by the collection component. The organic waste gas release component is used to release a preset volume of organic waste gas. The activated carbon desorbed by the first desorption component adsorbs the organic waste gas. The pressure monitoring component is used to detect pressure changes in the first detection chamber during the adsorption process. The activated carbon monitoring unit further includes a second activated carbon activity monitoring mechanism for detecting the adsorption capacity of the activated carbon placed inside the waste gas adsorption device, including the aforementioned vacuum machine and the second detection chamber; the activated carbon placed inside the waste gas adsorption device is collected and transferred to the second detection chamber by the aforementioned collection component, and the second detection chamber is evacuated by the vacuum machine; the second detection chamber includes the aforementioned organic waste gas release component and the gas pressure monitoring component. The second activated carbon activity monitoring mechanism also includes a second desorption component. The aforementioned desorption and regeneration triggering unit is configured to control the opening or closing of the second desorption component based on the pressure change results fed back by the aforementioned pressure monitoring component. The second desorption component enables the activated carbon in the second detection chamber to desorb toluene waste gas. The desorption and regeneration triggering unit is used to determine, based on the detection results, whether to trigger a desorption operation or a cleaning and regeneration operation on the activated carbon. The waste gas adsorption device includes a base and a rotating drum. Activated carbon is placed inside the rotating drum. The rotating drum includes a shaft that passes through the rotating drum and extends from at least one end of the rotating drum. The end of the shaft is rotatably connected to the base. The waste gas adsorption device includes a regeneration component. Supercritical carbon dioxide is placed inside the regeneration component, and the activated carbon in the waste gas adsorption device is cleaned and regenerated by supercritical carbon dioxide. The regeneration component is connected to the rotating drum through a gate. The desorption and regeneration triggering unit is configured to control the opening or closing of the gate based on the pressure change results fed back by the pressure monitoring component. When the desorption and regeneration triggering unit opens the gate, supercritical carbon dioxide enters the rotating drum from the regeneration component, causing the activated carbon to desorb toluene waste gas.

2. The multi-stage toluene circulation purification system according to claim 1, characterized in that: The inner wall of the rotating drum is provided with several baffles arranged at intervals in a spiral pattern, and the baffles protrude relative to each other on the inner wall surface of the rotating drum.

3. The multi-stage toluene circulation purification system according to claim 1, characterized in that: The waste gas adsorption device further includes a first heating structure; the heating structure includes a graphene heating layer laid on the inner wall of the rotating drum, which is used to heat the activated carbon to desorb the gas.

4. The multi-stage toluene circulation purification system according to claim 1, characterized in that: The collection component is equipped with a second heating structure and a weighing component. The second heating structure heats the activated carbon to dry it, and the weighing component is used to weigh the dried activated carbon.

5. A method for purifying toluene waste gas using the multi-stage toluene circulation purification system according to any one of claims 1-4, comprising a waste gas adsorption device for purifying residual waste gas with activated carbon, characterized in that... The method includes the following steps: The waste gas adsorption device is equipped with an activated carbon monitoring unit, which can be used to detect the desorption or cleaning and regeneration needs of the activated carbon. Based on the test results, it was determined whether to trigger a desorption operation or a cleaning and regeneration operation on the aforementioned activated carbon.

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