Multi-zone fitting continuous high-multiple-rate concentration device and concentration process thereof

Abstract

The application relates to a multi-partition fitting continuous high-multiple-rate concentration device and a concentration process thereof, and relates to the technical field of waste gas treatment. The middle part of the adsorption bed is provided with an adsorption column, both ends of the adsorption column are communicated with air pipes, one end of the two groups of air pipes away from the adsorption column is communicated with adsorption inlets and outlets, one side of the adsorption inlets and outlets is provided with cooling area inlets and outlets, one side of the cooling area inlets and outlets is provided with desorption area inlets and outlets, one side of the desorption area inlets and outlets is provided with a nitrogen inlet, and the adsorption inlets and outlets, the cooling area inlets and outlets, the desorption area inlets and outlets and the nitrogen inlet are communicated with the air pipes. The application avoids the problem that the molecular sieve in the desorption regeneration area is in an idle state when the desorption regeneration is not needed in the form of a single adsorption column, breaks through the traditional concentration concentration limit, can form continuous high-concentration desorption, saves energy consumption, effectively avoids the air leakage problem between the partitions, and realizes zero leakage of the adsorption equipment.

Description

Technical Field

[0001] This application relates to the field of waste gas treatment technology, and in particular to a multi-zone fitting continuous high-rate concentration device and its concentration process. Background Technology

[0002] Currently, in existing waste gas treatment processes, honeycomb molecular sieve rotors are often used as adsorption and concentration devices for waste gas purification. The effective adsorption cross section of this adsorption and concentration device is circular or annular, and a fan-shaped area is separated on the honeycomb molecular sieve rotor to form a desorption and regeneration zone. The motor drives the adsorption rotor to rotate, so that the molecular sieves in the adsorption zone enter the desorption and regeneration zone in sequence, thereby realizing the desorption and regeneration of the adsorption material.

[0003] The existing waste gas treatment process has the following problems: 1. The adsorption hood, adsorption rotor, and baffles are directly connected, resulting in poor sealing performance. After a period of use, friction caused by the rotation of the adsorption rotor leads to material wear, increasing the gaps and further worsening the sealing effect. This results in cross-ventilation, where high-pressure gas from the desorption / regeneration zone leaks into the adsorption zone, making it impossible to effectively desorb and regenerate the saturated adsorbent material. 2. Airflow is only blocked on both sides of the rotor, meaning the molecular sieve is a single integrated structure. Therefore, cross-ventilation occurs inside the molecular sieve, making it impossible to effectively desorb and regenerate the saturated molecular sieve. 3. Leakage and contact with oxygen pose a potential explosion risk, compromising safety. 4. During desorption, encountering easily polymerizable olefins and alkynes can cause polymerization and blockage of the molecular sieve adsorbent material, leading to performance degradation and difficulty in replacement. 5. The current desorption concentration of the rotor is limited to 25% LEL, resulting in difficulty in condensation or requiring lower temperatures, wasting resources. Furthermore, the lack of a flow equalization component during adsorption makes it difficult for waste gas to pass evenly through the adsorbent.

[0004] The existing fixed-bed adsorption process for treating waste gas has the following problems: 1. Large concentration fluctuations, which are not conducive to continuous condensation and have a large impact on the condensation unit; 2. Large desorption air volume, low concentration, low cooling temperature, and high energy consumption. Summary of the Invention

[0005] The purpose of this application is to provide a multi-zone fitting continuous high-rate concentration device and its concentration process.

[0006] Firstly, the multi-zone fitting continuous high-rate concentration device and its concentration process provided in this application adopt the following technical solution:

[0007] A multi-zone fitting continuous high-rate concentration device includes an adsorption bed, an adsorption column arranged in the middle of the adsorption bed, and air ducts connected to both ends of the adsorption column. Two sets of air ducts are connected to adsorption inlets and outlets at their ends furthest from the adsorption column. A desorption zone inlet and outlet are located on one side of the adsorption inlet and outlet, and a cooling zone inlet and outlet are located on one side of the desorption zone inlet and outlet. A nitrogen inlet is located on one side of the air ducts, and is located on one side of the desorption zone inlet. The adsorption inlet and outlet, cooling zone inlet and outlet, desorption zone inlet and outlet, and nitrogen inlet are all connected to the air ducts, and automatic valves are installed in the middle of each of these components. A circulation main pipe is connected to the ends of multiple sets of adsorption inlets and outlets, cooling zone inlets and outlets, desorption zone inlets and outlets, and nitrogen inlet. The multiple sets of adsorption beds are combined to form an adsorption zone, a cooling zone, and a desorption zone. A cooling zone is located on one side of the adsorption zone, and desorption zones are arranged on one side of the cooling zone.

[0008] By adopting the above technical solution: the adsorption bed consists of multiple sets of adsorption columns, which are connected by adsorption inlet and outlet, cooling zone inlet and outlet, desorption zone inlet and outlet, and nitrogen inlet, facilitating different processes within the multiple sets of adsorption columns. Automatic valves are used for automatic switching. Based on concentration requirements, the multiple adsorption beds 1 are divided into adsorption zones, cooling zones, and n desorption zones. Each zone has a specific number of adsorption columns. The n desorption zones and cooling zones form a closed-loop system. The design of the n-zone desorption ensures more thorough material desorption, thereby improving purification efficiency and adsorption outlet treatment efficiency. The device offers better performance while reducing desorption air volume, saving energy. It overcomes the sealing problems caused by the direct connection between the adsorption hood, adsorption rotor, and partitions. The single adsorption bed design provides better sealing performance compared to a large rotor, achieving zero leakage and avoiding cross-ventilation between zones. It also eliminates the need for sealing strips, preventing wear and material waste. The individual adsorption column design also avoids the problem of the molecular sieve in the desorption and regeneration zone being idle when desorption and regeneration are not required. The device can be opened simultaneously for adsorption, ensuring the space utilization of the adsorption column and improving the overall equipment utilization rate.

[0009] The ends of the inlet and outlet of the multiple sets of desorption zones are all connected to desorption heaters through a circulation main pipe, and the ends of the inlet and outlet of the cooling zones are all connected to condenser recovery units through a circulation main pipe.

[0010] By adopting the above technical solution: the gas can be heated by the desorption heater. The heat and humidity of the high-temperature gas cause the organic matter to desorb, and the organic pollutants are desorbed from the surface of the adsorbent to form high-concentration organic waste gas. The desorbed high-concentration organic waste gas enters the condenser and is cooled to condense the organic pollutants into liquid, thereby realizing recycling. The PLC logic controls the opening and closing of the automatic valves and automatically switches the adsorption, cooling and desorption processes according to the preset time sequence. Each adsorption bed switches to different functional areas in sequence to achieve continuous operation. Before each system start-up, the system is purged through the nitrogen desorption circulation path to ensure that the oxygen content inside the circulation pipeline is ≤5%. At the same time, each time the adsorption column in the adsorption zone is replaced, nitrogen is used to purge the individual adsorption.

[0011] The adsorption column is provided with adsorption packing material in the middle.

[0012] By adopting the above technical solution, activated carbon and molecular sieves can be used in combination as adsorption fillers. This combination can give full play to the advantages of both materials and is suitable for treating organic waste gas with complex components.

[0013] The concentration process of the multi-zone fitting continuous high-rate concentration device includes the following steps:

[0014] Step 1: Before adsorption begins, open the automatic valve in the middle of the nitrogen inlet of the adsorption column in the cooling zone to introduce nitrogen. After passing through the circulation path, exhaust the nitrogen through the nitrogen outlet valve on the main circulation pipe to the adsorption outlet for nitrogen purging, so that the oxygen content inside the circulation pipeline is ≤5%.

[0015] Step 2: Overall purging process: Nitrogen inlet → Cooling zone → Primary heating → Desorption zone 1 → Secondary heating → Desorption zone 2 → Tertiary heating → Desorption zone 3 → ... → Desorption zone n → Condenser recovery unit → Nitrogen exhaust. Start the purging and desorption process in reverse. During the cyclic purging, only the column to be switched into the desorption adsorption column is purged.

[0016] Step 3: When adsorption begins, the time for each adsorption column to be updated and iterated is set to T. After the last adsorption bed in the adsorption zone reaches the iteration time T, the valve is switched to the adsorption column in desorption zone 1. The last adsorption column in desorption zone 1 is then switched to desorption zone 2. The last adsorption column in desorption zone 2 is then switched to desorption zone 3. The last adsorption column in desorption zone 3 is then switched to desorption zone 4, and so on until it is switched to desorption zone n. The last adsorption column in desorption zone n is then switched to the cooling zone. The last adsorption column in the cooling zone is then switched back to the adsorption zone, forming a closed loop.

[0017] Step 4: PLC logic control performs overall control based on time. Through the design of multi-level stable and continuous adsorption-desorption curves, each adsorption column will experience n T in each zone, ensuring that the adsorption column is constantly renewed during the adsorption process and desorbed through n zones. It can also break through the LEL limit and can reach a saturation concentration close to the corresponding desorption temperature, which can be as high as 50% LEL or even 100% LEL.

[0018] The specific time T in step three can be controlled by PLC logic analysis. According to adsorption kinetics experiments, T needs to satisfy the requirement that the adsorption column reaches 80% to 90% of its saturated adsorption capacity. (Formula reference:) η is the safety factor, which is 0.8 to 0.9.

[0019] By adopting the above technical solutions: precise control of time T through PLC logic control, avoiding excessively long or short adsorption times, thereby maximizing adsorption effect and overall treatment efficiency; multi-stage desorption zone design to overcome the limitation of low desorption concentration in existing technologies, reducing air volume and increasing concentration; and multi-stage stable continuous adsorption-desorption curve design to solve the problem of different concentrations before and after desorption in existing technologies. Currently, this optimized design can achieve a stable high concentration of waste gas.

[0020] In step three, each time the adsorption column and desorption zone in the adsorption zone are replaced, nitrogen is used to purge the individual adsorption. When the oxygen content is >5%, nitrogen is automatically replenished to ensure the internal oxygen content.

[0021] By adopting the above technical solution, the risk of explosion caused by contact between desorbed high-concentration waste gas and oxygen is avoided by repeatedly purging individual adsorbed gases with nitrogen, thus ensuring both adsorption and desorption performance and higher safety.

[0022] In step three, after the waste gas is introduced into the adsorption column, it is then introduced into the adsorption packing. The adsorption packing adsorbs the organic matter in the waste gas through physical or chemical action by means of the pore structure on its surface or inside. The organic matter in the waste gas is adsorbed on the surface of the adsorption packing.

[0023] By adopting the above technical solution, the sealing problem caused by the direct connection between the adsorption hood, the adsorption wheel, and the partition is overcome. The design of a single adsorption bed has better sealing performance than a large wheel, achieving zero leakage, avoiding cross-ventilation between zones, and eliminating the need for sealing strips, thus avoiding wear and material consumption.

[0024] When switching valves in step three, the automatic valve is a solenoid valve with a switching time of ≤0.1 seconds to avoid pressure fluctuations. During switching, the exhaust gas inlet is briefly closed to prevent untreated exhaust gas from escaping.

[0025] By adopting the above technical solution, the switching can be completed within seconds, which can minimize production interruptions, maintain continuous operation, and is particularly beneficial for processes that require continuous processing. The use of solenoid valves eliminates the need for manual intervention, improving efficiency and reducing the possibility of human error.

[0026] If a set of adsorption columns fails to switch in step three, the automatic valve will be closed by PLC logic control, and the backup adsorption column will be automatically connected. The system will then alarm and enter protection mode.

[0027] By adopting the above technical solution, the setting of each adsorption column makes it easier to replace a piece of adsorption material when it is damaged or fails, reducing maintenance costs and extending service life. At the same time, the form of individual adsorption columns avoids the problem of the molecular sieve in the desorption and regeneration zone being idle when desorption and regeneration are not required. The device can be opened simultaneously for adsorption, ensuring the space utilization rate of the adsorption columns and improving the overall utilization rate of the equipment.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. The adsorption bed consists of multiple adsorption columns, which are connected by adsorption inlet and outlet, cooling zone inlet and outlet, desorption zone inlet and outlet, and nitrogen inlet. This facilitates different processes within the multiple adsorption columns, which are automatically switched by automatic valves. The adsorption bed is divided into several zones according to concentration requirements: an adsorption zone, a cooling zone, and n desorption zones. Each zone has a specific number of adsorption columns. The n desorption zones and cooling zone form a closed-loop system. The n-zone desorption design ensures more thorough material desorption, thereby improving purification efficiency and adsorption outlet treatment effect. It also reduces desorption airflow, saving energy. This design overcomes the sealing problems caused by direct connection between the adsorption hood, adsorption rotor, and partitions. The single adsorption bed design offers better sealing performance compared to a large rotor, achieving zero leakage and preventing cross-ventilation between zones. It also eliminates the need for sealing strips, avoiding wear and material loss. The individual adsorption column design also avoids the problem of the molecular sieve in the desorption regeneration zone being idle when desorption regeneration is not needed. The device can be opened simultaneously for adsorption, ensuring space utilization of the adsorption columns and improving the overall equipment utilization rate.

[0030] 2. The PLC logic controls the opening and closing of automatic valves, automatically switching between adsorption, cooling, and desorption processes according to a preset time sequence. Each adsorption bed switches to different functional areas in sequence to achieve continuous operation. Before each system start-up, the system is purged through a nitrogen desorption circulation path to ensure that the oxygen content inside the circulation pipeline is ≤5%. At the same time, each time the adsorption column in the adsorption zone is replaced, nitrogen is used to purge the individual adsorption to ensure the internal oxygen content and avoid the risk of explosion caused by contact between high-concentration desorbed waste gas and oxygen. This ensures both high adsorption and desorption performance and higher safety. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the internal connection structure of the adsorption column in an embodiment of this application;

[0033] Figure 3 This is a schematic diagram of the internal structure of the adsorption column according to an embodiment of this application;

[0034] Figure 4 This is a schematic diagram of the predictive performance curve structure of an embodiment of this application;

[0035] Figure 5 This is a schematic diagram of the nitrogen gas introduction process before adsorption in an embodiment of this application;

[0036] Explanation of reference numerals in the attached diagram: 1. Adsorption bed; 2. Adsorption column; 3. Duct; 4. Adsorption inlet / outlet; 5. Desorption zone inlet / outlet; 6. Cooling zone inlet / outlet; 7. Nitrogen inlet; 8. Automatic valve; 9. Main circulation pipe; 10. Adsorption zone; 11. Cooling zone; 12. Desorption zone; 13. Desorption heater; 131. Condensation recovery unit; 14. Adsorption packing. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1 - Appendix Figure 5 This application will be described in further detail below.

[0038] Example: A multi-zone fitting continuous high-rate concentration device includes an adsorption bed 1, an adsorption column 2 arranged in the middle of the adsorption bed 1, and air ducts 3 connected to both ends of the adsorption column 2. The ends of the two sets of air ducts 3 furthest from the adsorption column 2 are connected to adsorption inlet / outlet 4. A desorption zone inlet / outlet 5 is provided on one side of the adsorption inlet / outlet 4, and a cooling zone inlet / outlet 6 is provided on one side of the desorption zone inlet / outlet 5. A nitrogen inlet 7 is provided on one side of the air duct 3, located on the side of the desorption zone inlet. The adsorption inlet / outlet 4, cooling zone inlet / outlet 6, desorption zone inlet / outlet 5, and nitrogen inlet 7 are all connected to... The air ducts 3 are interconnected, and automatic valves 8 are installed in the middle of the adsorption inlet / outlet 4, cooling zone inlet / outlet 6, desorption zone inlet / outlet 5, and nitrogen inlet 7. The ends of the multiple adsorption inlet / outlet 4, cooling zone inlet / outlet 6, desorption zone inlet / outlet 5, and nitrogen inlet 7 are all connected to a circulation main pipe 9. The multiple adsorption beds 1 are combined to form an adsorption zone 10, a cooling zone 11, and a desorption zone 12. A cooling zone 11 is arranged on one side of the adsorption zone 10, and a desorption zone 12 is arranged on one side of the cooling zone 11. The adsorption bed 1 is composed of multiple adsorption columns 2, and the multiple adsorption columns 2 are connected to the adsorption inlet / outlet. 4. The cooling zone inlet / outlet 6, the desorption zone inlet / outlet 5, and the nitrogen inlet 7 are connected to facilitate different processes within multiple adsorption columns 2. Automatic valves 8 are used for automatic switching. Based on concentration requirements, the multiple adsorption beds 1 are divided into adsorption zones 10, cooling zones 11, and n desorption zones 12. Each zone has a specific number of adsorption columns 2. The n desorption zones 12 and cooling zones 11 form a closed-loop system. The n-zone desorption design ensures more thorough material desorption, thereby improving purification efficiency and resulting in better adsorption outlet treatment. Simultaneously, it minimizes the desorption area. The air volume is high, saving energy. It overcomes the sealing problems caused by the direct connection between the adsorption hood, adsorption wheel, and partition. The design of a single adsorption bed has better sealing performance than a large wheel, achieving zero leakage and avoiding cross-ventilation between zones. It also eliminates the need for sealing strips, avoiding wear and material waste. The form of a separate adsorption column 2 also avoids the problem of the molecular sieve in the desorption and regeneration zone being idle when desorption and regeneration are not needed. The device can be opened simultaneously for adsorption, ensuring the space utilization of adsorption column 2 and improving the overall equipment utilization rate.

[0039] The ends of the inlet and outlet of multiple desorption zones 5 are all connected to desorption heaters 13 through a circulation main pipe 9. The ends of the inlet and outlet of the cooling zone 6 are all connected to condensers 131 through a circulation main pipe 9. The gas can be heated by the desorption heaters 13. The heat and humidity of the high-temperature gas cause organic matter to desorb, and organic pollutants are desorbed from the surface of the adsorbent to form high-concentration organic waste gas. The desorbed high-concentration organic waste gas enters the condenser 131, where the organic pollutants are condensed into liquid through cooling, thereby achieving recycling. The PLC logic controls the opening and closing of the automatic valves 8 and automatically switches the adsorption, cooling and desorption processes according to the preset time sequence. Each adsorption bed 1 switches to different functional areas in sequence to achieve continuous operation. Before each system start-up, the system is purged through the nitrogen desorption circulation path to ensure that the oxygen content inside the circulation pipeline is ≤5%. At the same time, each time the desorption zone of the adsorption column 2 in the adsorption zone 10 is replaced, nitrogen is used to purge the individual adsorption.

[0040] The adsorption column 2 is provided with an adsorption packing 14 in the middle. Activated carbon and molecular sieve can be used in combination as adsorption packing 14. This combination can give full play to the advantages of the two materials and is suitable for treating organic waste gas with complex components.

[0041] The concentration process of a multi-zone fitting continuous high-rate concentration unit includes the following steps:

[0042] Step 1: Before adsorption begins, open the automatic valve 8 in the middle of the nitrogen inlet 7 of the adsorption column 2 in the cooling zone 11 to introduce nitrogen. After passing through the circulation path, the nitrogen is exhausted through the nitrogen outlet valve on the circulation path main pipe 9 to the adsorption outlet for nitrogen purging, so that the oxygen content inside the circulation pipeline is ≤5%.

[0043] Step 2: Overall purging process: Nitrogen inlet → Cooling zone 11 → Primary heating → Desorption zone 1 → Secondary heating → Desorption zone 2 → Tertiary heating → Desorption zone 3 → ... → Desorption zone n → Condensation recovery unit 131 → Nitrogen exhaust. Start the purging and desorption process in reverse. During the cyclic purging, only the column 2 that will be switched to the desorption adsorption column is purged.

[0044] Step 3: When adsorption begins, the time for each adsorption column 2 to be updated and iterated is set to T. After the last adsorption bed 1 in the adsorption zone 10 reaches the iteration time T, the valve is switched to the adsorption column 2 in the desorption zone 1. The last adsorption column 2 in the desorption zone 1 then switches to the desorption zone 2. The last adsorption column 2 in the desorption zone 2 then switches to the desorption zone 3. The last adsorption column 2 in the desorption zone 3 then switches to the desorption zone 4, and so on until it switches to the desorption zone n. The last adsorption column 2 in the desorption zone n then switches to the cooling zone 11. The last adsorption column 2 in the cooling zone 11 then switches back to the adsorption zone 10, forming a closed loop.

[0045] Step 4: PLC logic control performs overall control based on time. Through the design of multi-level stable and continuous adsorption-desorption curves, each adsorption column 2 will undergo n T in each zone, ensuring that the adsorption column 2 is constantly renewed during the adsorption process and undergoes desorption through n zones. It can also break through the LEL limit and can reach a saturation concentration close to the corresponding desorption temperature, which can reach 50% LEL or even 100% LEL.

[0046] The specific time T in step three can be controlled by PLC logic analysis. According to the adsorption kinetics experiment, T needs to satisfy the condition that adsorption column 2 reaches 80% to 90% of its saturated adsorption capacity. See the formula below: η is the safety factor, ranging from 0.8 to 0.9. Precise control of time T is achieved through PLC logic control, avoiding excessively long or short adsorption times to maximize adsorption effect and overall treatment efficiency. The multi-stage desorption zone design addresses the limitation of low desorption concentration in existing technologies, reducing airflow while increasing concentration. Furthermore, the multi-stage stable and continuous adsorption-desorption curve design solves the problem of inconsistent concentrations before and after desorption in existing technologies. This optimized design currently yields a relatively stable high-concentration waste gas.

[0047] In step three, each time the adsorption column 2 and the desorption zone 10 are replaced, nitrogen is used to purge the individual adsorption. When the oxygen content is >5%, nitrogen is automatically replenished to ensure the internal oxygen content. By purging the individual adsorption with nitrogen multiple times, the risk of explosion caused by the contact between the desorbed high-concentration waste gas and oxygen is avoided, thus ensuring higher safety while maintaining adsorption and desorption performance.

[0048] In step three, after the waste gas is introduced into the adsorption column 2, it is then introduced into the adsorption packing 14. The adsorption packing 14 adsorbs the organic matter in the waste gas through physical or chemical action by means of its surface or internal pore structure. The organic matter in the waste gas is adsorbed on the surface of the adsorption packing 14, which overcomes the sealing problem caused by the direct connection between the adsorption hood, the adsorption wheel, and the partition. The design of a single adsorption bed 1 has better sealing performance than a large wheel, achieving zero leakage, avoiding cross-ventilation between zones, and eliminating the need for sealing strips, thus avoiding wear and material loss.

[0049] When switching valves in step three, the automatic valve 8 uses a solenoid valve with a switching time of ≤0.1 seconds to avoid pressure fluctuations. During switching, the exhaust gas inlet is briefly closed to prevent untreated exhaust gas from escaping. The switching is completed within 0.1 seconds, which can minimize production interruptions and maintain continuous operation. This is particularly beneficial for processes that require continuous processing. Using a solenoid valve eliminates the need for manual intervention, improving efficiency and reducing the possibility of human error.

[0050] If a set of adsorption columns 2 fails to switch in step three, the automatic valve 8 will be closed by the PLC logic control, and the backup adsorption column 2 will be automatically connected. The system will alarm and enter the protection mode. The setting of each adsorption column 2 makes it easier to replace a piece of adsorption material when it is damaged or fails, reducing maintenance costs and extending service life. At the same time, the form of individual adsorption columns 2 avoids the problem of the molecular sieve in the desorption and regeneration zone being idle when desorption and regeneration are not required. The device can be opened simultaneously for adsorption, ensuring the space utilization rate of adsorption columns 2 and improving the overall utilization rate of the equipment.

[0051] The implementation principle of this application embodiment is as follows: First, before adsorption begins, the automatic valve 8 in the middle of the nitrogen inlet 7 of the adsorption column 2 in the cooling zone 11 is opened to introduce nitrogen gas. After passing through the circulation path, the nitrogen gas is exhausted through the nitrogen outlet valve on the circulation path main pipe 9 to the adsorption outlet. The overall purging process is: nitrogen gas inlet → cooling zone 11 → primary heating → desorption zone 1 → secondary heating → desorption zone 2 → tertiary heating → desorption zone 3 → ... → desorption zone n → condenser recovery unit 131 → nitrogen exhaust. When adsorption begins, the time for each iteration of each adsorption column 2 is set to T. After the last adsorption bed 1 in the adsorption zone 10 reaches the iteration time T, the valve is switched to the adsorption column 2 in the desorption zone 1, while the last adsorption column 2 in the desorption zone 1 switches to the desorption zone 2. The last adsorption column 2 in the desorption zone 2 then switches to the desorption zone 2. The adsorption column 2 switches to the desorption zone 3, and the adsorption column 2 at the very end of the desorption zone 3 switches to the desorption zone 4, and so on until it switches to the desorption zone n. The adsorption column 2 at the very end of the desorption zone n then switches to the cooling zone 11, and the adsorption column 2 at the very end of the cooling zone 11 switches to the adsorption zone 10, forming a closed loop. The gas can be heated by the desorption heater 13. The heat and humidity of the high-temperature gas cause the organic matter to desorb, and the organic pollutants are desorbed from the surface of the adsorbent, forming a high-concentration organic waste gas. The desorbed high-concentration organic waste gas enters the condenser 131, where the organic pollutants are condensed into liquid through cooling, thereby achieving recycling. The adsorption, cooling and desorption processes are automatically switched according to the preset time sequence. Each adsorption bed 1 switches to different functional zones in sequence to achieve continuous operation.

[0052] Precise control of time T via PLC logic ensures optimal adsorption efficiency and avoids excessively long or short adsorption times. When oxygen content exceeds 5%, nitrogen is automatically replenished to maintain internal oxygen levels. Multiple nitrogen purging cycles prevent explosions caused by high-concentration waste gas contacting oxygen, ensuring both high adsorption / desorption performance and enhanced safety. This design overcomes the sealing issues caused by direct connections between the adsorption hood, adsorption rotor, and partitions. The individual adsorption bed 1 design offers superior sealing compared to a large rotor, achieving zero leakage and preventing cross-ventilation between zones. It also eliminates the need for sealing strips, preventing wear and material waste. Automatic valve 8, using a solenoid valve, allows for switching with a time ≤0.1 seconds, preventing pressure fluctuations. A brief closure of the waste gas inlet during switching prevents untreated waste gas from escaping. This 0.1-second switching minimizes production interruptions and ensures continuous operation, particularly beneficial for processes requiring continuous processing. The solenoid valve eliminates the need for manual intervention, improving efficiency and reducing human error.

[0053] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be included within the scope of protection of this application.

Claims

1. A concentration process for a multi-zone fitting continuous high-rate concentration device, characterized in that: The device includes an adsorption bed (1), an adsorption column (2) arranged in the middle of the adsorption bed (1), and air ducts (3) connected to both ends of the adsorption column (2). The ends of the two sets of air ducts (3) away from the adsorption column (2) are connected to adsorption inlets and outlets (4). A desorption zone inlet and outlet (5) is provided on one side of the adsorption inlet and outlet (4), and a cooling zone inlet and outlet (6) is provided on one side of the desorption zone inlet and outlet (5). A nitrogen inlet (7) is provided on one side of the air duct (3), and the nitrogen inlet (7) is located on one side of the desorption zone inlet. The adsorption inlet and outlet (4), cooling zone inlet and outlet (6), desorption zone inlet and outlet (5) and... Nitrogen inlet (7) is connected to air duct (3), and automatic valve (8) is provided in the middle of adsorption inlet / outlet (4), cooling zone inlet / outlet (6), desorption zone inlet / outlet (5) and nitrogen inlet (7). The ends of multiple sets of adsorption inlet / outlet (4), cooling zone inlet / outlet (6), desorption zone inlet / outlet (5) and nitrogen inlet (7) are connected to circulation main pipe (9). Multiple sets of adsorption beds (1) are combined to form adsorption zone (10), cooling zone (11) and desorption zone (12). A cooling zone (11) is provided on one side of adsorption zone (10), and a desorption zone (12) is arranged on one side of cooling zone (11). The ends of the inlet and outlet (6) of the cooling zone are all connected to a condenser (131) through the circulation main pipe (9). The concentration process of the multi-zone fitting continuous high-rate concentration device includes the following steps: Step 1: Before adsorption, open the automatic valve (8) in the middle of the nitrogen inlet (7) of the adsorption column (2) in the cooling zone (11) to introduce nitrogen. After passing through the circulation path, the nitrogen is exhausted through the nitrogen outlet valve on the circulation path main pipe (9) to the adsorption outlet for nitrogen purging, so that the oxygen content inside the circulation pipeline is ≤5%. Step 2: Purging process: Nitrogen gas inlet → Cooling zone (11) → Primary heating → Desorption zone 1 → Secondary heating → Desorption zone 2 → Tertiary heating → Desorption zone 3 → ... → Desorption zone n → Condensation recovery unit (131) → Nitrogen gas exhaust. Start the purging and desorption process in reverse. During the cyclic purging, only the column to be switched into the desorption adsorption column (2) is purged. Step 3: When adsorption begins, the time for each adsorption column (2) to be updated and iterated is set to T. After the last adsorption bed (1) of the adsorption zone (10) reaches the iteration time T, the valve is switched to the adsorption column (2) in the desorption zone 1. The last adsorption column (2) of the desorption zone 1 is switched to the desorption zone 2. The last adsorption column (2) of the desorption zone 2 is switched to the desorption zone 3. The last adsorption column (2) of the desorption zone 3 is switched to the desorption zone 4. This continues until the desorption zone n is switched. The last adsorption column (2) of the desorption zone n is switched to the cooling zone (11). The last adsorption column (2) of the cooling zone (11) is switched to the adsorption zone (10), forming a closed loop. Step 4: The time is controlled as a whole by PLC logic control. Through the design of multi-level stable continuous adsorption-desorption curves, each adsorption column (2) will experience n T in each zone, ensuring that the adsorption column (2) is constantly updated during the adsorption process and desorbed through n zones, and can break through the LEL limit.

2. The concentration process of a multi-zone fitting continuous high-rate concentration device according to claim 1, characterized in that: The ends of the inlet and outlet (5) of the multiple sets of desorption zones are all connected to desorption heaters (13) through the circulation main pipe (9).

3. The concentration process of a multi-zone fitting continuous high-rate concentration device according to claim 1, characterized in that: The adsorption column (2) is provided with an adsorption packing material (14) in the middle.

4. The concentration process of a multi-zone fitting continuous high-rate concentration device according to claim 3, characterized in that: The specific time T in step three can be controlled by PLC logic analysis. According to the adsorption kinetics experiment, T needs to satisfy the adsorption column (2) reaching 80% to 90% saturated adsorption capacity. The formula is as follows: η is the safety factor, which is 0.8 to 0.

9.

5. The concentration process of a multi-zone fitting continuous high-rate concentration device according to claim 4, characterized in that: In step three, each time the adsorption column (2) in the adsorption zone (10) is replaced with the desorption zone, nitrogen is used to purge the adsorption column individually. When the oxygen content is >5%, nitrogen is automatically replenished to ensure the internal oxygen content.

6. The concentration process of a multi-zone fitting continuous high-rate concentration device according to claim 5, characterized in that: In the adsorption process of step three, after the waste gas is introduced into the adsorption column (2), the waste gas is introduced into the adsorption packing (14). The adsorption packing (14) adsorbs the organic matter in the waste gas through the pore structure on its surface or inside, using physical or chemical action. The organic matter in the waste gas is adsorbed on the surface of the adsorption packing (14).

7. The concentration process of a multi-zone fitting continuous high-rate concentration device according to claim 6, characterized in that: When switching valves in step three, the automatic valve (8) is a solenoid valve with a switching time of ≤0.1 seconds to avoid pressure fluctuations. During switching, the exhaust gas inlet is briefly closed to prevent untreated exhaust gas from escaping.

8. The concentration process of a multi-zone fitting continuous high-rate concentration device according to claim 7, characterized in that: If a set of adsorption columns (2) fails to switch in step three, the automatic valve (8) is closed by PLC logic control, and the spare adsorption column (2) is automatically connected. The system alarms and enters protection mode.

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