Continuous desorption system for VOCs (Volatile Organic Compounds) in activated carbon

Abstract

The invention discloses a continuous desorption system for VOCs (volatile organic compounds) in activated carbon. The continuous desorption system comprises at least four groups of desorbers arranged in parallel, at least two groups of desorbers are connected into a desorption circulation gas circuit, one group of desorbers is connected into a cooling circulation gas circuit, and the other group of desorbers is standby; wherein the desorption circulation gas circuit comprises a heater, a dust remover, a heat exchanger, a desorption condenser and a desorption fan; the dust remover is communicated with a gas outlet of the desorber, a gas outlet of the dust remover is communicated with the desorption condenser through a high-temperature side of the heat exchanger, a discharge port of the desorption condenser is communicated with a solvent tank, a gas outlet of the desorption condenser is connected with the desorption fan, and the desorption fan is connected with the desorption condenser. The desorption fan is communicated with the heater through the low-temperature side of the heat exchanger, and the outlet end of the heater is communicated with each desorber; and the cooling circulation gas circuit comprises a cooling condenser and a cooling fan which are communicated with the gas outlet of the desorber. The continuous regeneration of the activated carbon material is realized.

Description

Technical Field

[0001] This invention relates to the fields of environmental protection and hazardous waste disposal and regeneration technology, specifically to a continuous desorption system for VOCs in activated carbon. Background Technology

[0002] In the current industrial VOCs emission and treatment processes, microporous adsorption materials, represented by activated carbon, are widely used to purify and enrich organic matter. This application process generates spent activated carbon, most of which is used for single-use purposes, producing secondary hazardous waste and incurring excessive costs. Therefore, the recycling of activated carbon has become an important and feasible means to reduce costs and energy consumption.

[0003] Therefore, a continuous desorption system for VOCs in activated carbon is provided to achieve continuous regeneration of activated carbon materials, realize the recycling of activated carbon, thereby reducing production costs and energy consumption, which is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] Therefore, embodiments of the present invention provide a continuous desorption system for VOCs in activated carbon to solve the problem that continuous desorption and regeneration of activated carbon cannot be achieved in the prior art.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] This invention provides a continuous desorption system for VOCs from activated carbon, comprising:

[0007] At least four sets of desorbers are connected in parallel, at least two sets of desorbers are connected to the desorption circulation gas path, one set of desorbers is connected to the cooling circulation gas path, and one set of desorbers is in standby mode.

[0008] The desorption circulating gas path includes a heater, a dust collector, a heat exchanger, a desorption condenser, and a desorption fan. The dust collector is connected to the outlet of the desorber. The outlet of the dust collector is connected to the desorption condenser through the high-temperature side of the heat exchanger. The outlet of the desorption condenser is connected to the solvent tank. The outlet of the desorption condenser is connected to the desorption fan. The desorption fan is connected to the heater through the low-temperature side of the heat exchanger. The outlet of the heater is connected to each of the desorbers.

[0009] The cooling circulating air path includes a cooling condenser and a cooling fan connected to the air outlet of the desorber.

[0010] In this way, by using at least four sets of desorbers connected in parallel, with at least two sets connected to the desorption circulation gas path, one set connected to the cooling circulation gas path, and one set on standby, continuous desorption of VOCs from activated carbon is achieved, avoiding production interruptions caused by equipment switching and improving production efficiency. The heater, dust collector, heat exchanger, desorption condenser, and desorption fan in the desorption circulation gas path work together to efficiently desorb activated carbon, while simultaneously condensing and recovering the organic materials generated during desorption, improving resource utilization. The heat exchanger facilitates heat exchange between high-temperature and low-temperature gases, reducing heater energy consumption and improving system energy efficiency. This enables continuous regeneration of activated carbon materials, allowing for the recycling of activated carbon, thereby reducing production costs and energy consumption.

[0011] In some embodiments, the desorbers are four units arranged in parallel, namely a first desorber, a second desorber, a third desorber, and a fourth desorber.

[0012] In some embodiments, when there are four desorbers, the desorption process includes:

[0013] During desorption operation, valves 1 and 2 of the first desorber and valves 1 and 2 of the second desorber are opened, and the remaining valves are closed, connecting the first and second desorbers to the desorption circulation gas path. The desorption fan runs continuously, and the heater heats the circulation gas to maintain the set temperature. The high-temperature desorption circulation gas passes sequentially through the first and second desorbers arranged in parallel, as well as the dust collector, heat exchanger, desorption condenser, desorption fan, and heat exchanger, returning to the heater to complete the cycle. During the desorption cycle, the organic material condensed in the desorption condenser is stored in the solvent tank.

[0014] Under cooling conditions, open valves 1 and 2 of the third desorber, close the remaining valves, and connect the third desorber to the desorption circulation gas path; close valves 1 and 2 of the first desorber, open valves 3 and 4 of the first desorber, and transfer the first desorber from the desorption circulation gas path to the cooling circulation gas path; the cooling fan continues to run; the low-temperature circulating gas passes through the first desorber, the cooling condenser, and the cooling fan, and returns to the first desorber to complete the cycle;

[0015] Under the cyclic switching condition, after the continuous desorption system has been running for one time cycle, the first desorber completes cooling and closes valves 3 and 4 of the first desorber to disconnect from the cooling circulation gas path; the first desorber performs unloading and loading operations; valves 1 and 2 of the second desorber are closed, and valves 3 and 4 of the second desorber are opened, and the second desorber switches from the desorption circulation gas path to the cooling circulation gas path; valves 1 and 2 of the fourth desorber are opened, and the remaining valves are closed, and the fourth desorber is connected to the desorption circulation gas path;

[0016] In standby mode, the first desorber, under safe temperature and without being connected to the desorption circulation gas path or cooling circulation gas path, unloads the desorbed activated carbon and refills it with raw material activated carbon. After the first desorber completes unloading and reloading, valves 5 and 6 of the continuous desorption system are opened to introduce low-pressure nitrogen to displace and expel the oxygen in the first desorber. After the displacement is completed, valves 5 and 6 are closed. The first desorber is then connected to the desorption circulation gas path in standby mode.

[0017] In some embodiments, when there are four desorbers, during continuous production, the four desorbers operate sequentially so that at any given moment, two desorbers are performing desorption, one desorber is cooling down, and one desorber is on standby; each desorber sequentially completes two desorption cycles and one cooling cycle, and then completes unloading, loading, and replacement operations within the fourth cycle.

[0018] In some embodiments, the desorbers are five units arranged in parallel, namely a first desorber, a second desorber, a third desorber, a fourth desorber, and a fifth desorber.

[0019] In some embodiments, when there are five desorbers, the desorption process includes:

[0020] During desorption, valves 1 and 2 of the first desorber, valves 1 and 2 of the second desorber, and valves 1 and 2 of the third desorber are opened, while the remaining valves are closed. The first, second, and third desorbers are then connected to the desorption circulation gas path. The desorption fan operates continuously, and the heater heats the circulation gas to maintain the set temperature. The high-temperature desorption circulation gas passes sequentially through the first, second, and third desorbers connected in parallel, as well as the dust collector, heat exchanger, desorption condenser, desorption fan, and heat exchanger, before returning to the heater to complete the cycle. During the desorption cycle, the organic material condensed in the desorption condenser is stored in the solvent tank.

[0021] Under cooling conditions, open valves 1 and 2 of the fourth desorber, close the remaining valves, and connect the fourth desorber to the desorption circulation gas path; close valves 1 and 2 of the first desorber, open valves 3 and 4 of the first desorber, and transfer the first desorber from the desorption circulation gas path to the cooling circulation gas path; the cooling fan continues to run; the low-temperature circulating gas passes through the first desorber, the cooling condenser, and the cooling fan, and returns to the first desorber to complete the cycle;

[0022] Under the cyclic switching condition, after the continuous desorption system has been running for one time cycle, the first desorber completes cooling and closes valves 3 and 4 of the first desorber to disconnect from the cooling circulation gas path; the first desorber performs unloading and loading operations; valves 1 and 2 of the second desorber are closed, and valves 3 and 4 of the second desorber are opened, and the second desorber switches from the desorption circulation gas path to the cooling circulation gas path; valves 1 and 2 of the fifth desorber are opened, and the remaining valves are closed, and the fifth desorber is connected to the desorption circulation gas path;

[0023] In standby mode, the first desorber, under safe temperature and without being connected to the desorption circulation gas path or cooling circulation gas path, unloads the desorbed activated carbon and refills it with raw material activated carbon. After the first desorber completes unloading and reloading, valves 5 and 6 of the continuous desorption system are opened to introduce low-pressure nitrogen to displace and expel the oxygen in the first desorber. After the displacement is completed, valves 5 and 6 are closed. The first desorber is then connected to the desorption circulation gas path in standby mode.

[0024] In some embodiments, when there are five desorbers, during continuous production, the five desorbers operate sequentially so that at any given moment, three desorbers are performing desorption, one desorber is cooling down, and one desorber is on standby; each desorber sequentially completes three desorption cycles and one cooling cycle, and then completes unloading, loading, and replacement operations within the fifth cycle.

[0025] In some embodiments, the desorbers are six units arranged in parallel, namely a first desorber, a second desorber, a third desorber, a fourth desorber, a fifth desorber, and a sixth desorber.

[0026] In some embodiments, two desorbers are selected to be connected to the desorption circulation gas path, one desorber is connected to the cooling circulation gas path, and one desorber is used for unloading and loading, while the two desorbers are in an idle state.

[0027] In continuous production, there are two desorbers for desorption, one desorber for cooling, one desorber for standby, and two desorbers for idleness in an instantaneous state. Each desorber sequentially completes two desorption cycles and one cooling cycle, and then completes unloading, loading, and replacement operations in the fourth cycle.

[0028] In some embodiments, three desorbers are selected to be connected to the desorption circulation gas path, one desorber is connected to the cooling circulation gas path, one desorber is used for unloading and loading, and one desorber is in an idle state.

[0029] In continuous production, there are three desorbers for desorption, one desorber for cooling, one desorber for standby, and one desorber for idleness in an instantaneous state. Each desorber sequentially completes three desorption cycles and one cooling cycle, and then completes unloading, loading, and replacement operations within the fifth cycle.

[0030] In some embodiments, four desorbers are selected to be connected to the desorption circulation gas path, one desorber is connected to the cooling circulation gas path, and one desorber is used for unloading and loading.

[0031] In continuous production, there are four desorbers performing desorption, one desorber performing cooling, and one desorber in standby mode at any given time. Each desorber sequentially completes four desorption cycles and one cooling cycle, and then completes unloading, loading, and replacement operations within the sixth cycle. Attached Figure Description

[0032] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0033] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0034] Figure 1 This is one of the structural schematic diagrams of the continuous VOCs desorption system in activated carbon provided by the present invention;

[0035] Figure 2This is the second schematic diagram of the continuous VOCs desorption system in activated carbon provided by the present invention.

[0036] Figure 3 This is the third schematic diagram of the continuous VOCs desorption system in activated carbon provided by the present invention.

[0037] Explanation of reference numerals in the attached figures:

[0038] T1 is the first desorber, T2 is the second desorber, T3 is the third desorber, T4 is the fourth desorber, T5 is the fifth desorber, T6 is the sixth desorber, 2 is the heater, 3 is the dust collector, 4 is the heat exchanger, 5 is the desorption condenser, 6 is the desorption fan, 7 is the cooling condenser, 8 is the cooling fan, and 9 is the solvent tank.

[0039] ①-⑥ are the valves of the adsorber. Detailed Implementation

[0040] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] In one specific embodiment, the continuous VOCs desorption system for activated carbon provided by the present invention includes at least four sets of desorbers arranged in parallel, at least two sets of desorbers are connected to the desorption circulation gas path, one set of desorbers is connected to the cooling circulation gas path, and one set of desorbers is on standby; wherein, the desorption circulation gas path includes a heater 2, a dust collector 3, a heat exchanger 4, a desorption condenser 5, and a desorption fan 6; the dust collector 3 is connected to the outlet of the desorber, the outlet of the dust collector 3 is connected to the desorption condenser 5 through the high-temperature side of the heat exchanger 4, the outlet of the desorption condenser 5 is connected to the solvent tank, the outlet of the desorption condenser 5 is connected to the desorption fan, the desorption fan 6 is connected to the heater 2 through the low-temperature side of the heat exchanger 4, and the outlet of the heater 2 is connected to each of the desorbers; the cooling circulation gas path includes a cooling condenser 7 and a cooling fan 8 connected to the outlet of the desorber.

[0042] The aforementioned desorption circulation gas path and cooling circulation gas path are independent and do not interfere with each other. Both the desorption circulation gas path and the cooling circulation gas path can operate continuously. The continuous desorption system contains four or more desorbers. Multiple desorbers switch their functions sequentially through valve switching according to time cycles. The functions include high-temperature desorption, cooling, unloading and loading. During implementation, the number of desorbers connected to the desorption circulation gas path can be adjusted according to needs, leaving the remaining desorbers idle.

[0043] In this way, by using at least four sets of desorbers connected in parallel, with at least two sets connected to the desorption circulation gas path, one set connected to the cooling circulation gas path, and one set on standby, continuous desorption of VOCs from activated carbon is achieved, avoiding production interruptions caused by equipment switching and improving production efficiency. The heater 2, dust collector 3, heat exchanger 4, desorption condenser 5, and desorption fan 6 in the desorption circulation gas path work together to efficiently desorb activated carbon, while simultaneously condensing and recovering the organic materials generated during the desorption process, improving resource utilization. The heat exchanger facilitates heat exchange between high-temperature and low-temperature gases, reducing heater energy consumption and improving system energy efficiency. This enables continuous regeneration of activated carbon materials, allowing for the recycling of activated carbon, thereby reducing production costs and energy consumption.

[0044] Specifically, the desorbers are four units arranged in parallel. For ease of description, the four desorbers are named the first desorber T1, the second desorber T2, the third desorber T3, and the fourth desorber T4. The desorption process includes:

[0045] Under desorption conditions, open valves ① and ② of the first desorber T1 and valves ① and ② of the second desorber T2, and close the remaining valves to connect the first desorber T1 and the second desorber T2 to the desorption circulation gas path; the desorption fan 6 runs continuously, and the heater 2 heats the circulation gas to maintain the set temperature; the high-temperature desorption circulation gas passes sequentially through the first desorber T1 and the second desorber T2 connected in parallel, as well as the dust collector 3, heat exchanger 4, desorption condenser 5, desorption fan 6, and heat exchanger 4, and returns to the heater 2 to complete the cycle; the organic material condensed in the desorption condenser during the desorption cycle enters the solvent tank for storage;

[0046] Under cooling conditions, open valves 1 and 2 of the third desorber T3, close the remaining valves, and connect the third desorber T3 to the desorption circulation gas path; close valves 1 and 2 of the first desorber T1, open valves 3 and 4 of the first desorber T1, and transfer the first desorber T1 from the desorption circulation gas path to the cooling circulation gas path; the cooling fan continues to operate; the low-temperature circulating gas passes through the first desorber T1, the cooling condenser 7, and the cooling fan 8, and returns to the first desorber T1 to complete the cycle;

[0047] Under the cyclic switching condition, after the continuous desorption system has been running for one time cycle, the first desorber T1 completes cooling and closes valves 3 and 4 of the first desorber T1 to disconnect from the cooling circulation gas path; the first desorber T1 performs unloading and loading operations; valves 1 and 2 of the second desorber T2 are closed, and valves 3 and 4 of the second desorber T2 are opened, so the second desorber T2 switches from the desorption circulation gas path to the cooling circulation gas path; valves 1 and 2 of the fourth desorber T4 are opened, and the remaining valves are closed, so the fourth desorber T4 is connected to the desorption circulation gas path;

[0048] In standby mode, the first desorber T1, under safe temperature and without being connected to the desorption circulation gas path or the cooling circulation gas path, unloads the desorbed activated carbon and refills it with raw material activated carbon. After the first desorber T1 completes unloading and reloading, valves 5 and 6 of the continuous desorption system are opened to introduce low-pressure nitrogen to replace and expel the oxygen in the first desorber T1. After the replacement is completed, valves 5 and 6 are closed. The first desorber T1 is then connected to the desorption circulation gas path in standby mode.

[0049] In this way, by opening and closing the valves, the desorber can automatically switch between different operating conditions such as desorption, cooling, circulation switching, and standby, reducing manual operation and improving the automation level of the system. In the desorption condition, the high-temperature desorption circulating gas passes through the desorber, dust collector 3, heat exchanger 4, desorption condenser 5, etc. in sequence to form a closed loop, ensuring the efficient operation of the desorption process and avoiding heat waste. In the standby condition, the oxygen is replaced by low-pressure nitrogen, ensuring that the desorber is in standby at a safe temperature and preventing potential safety hazards caused by residual oxygen.

[0050] Furthermore, when there are four desorbers, during continuous production, the four desorbers operate sequentially, ensuring that at any given moment, two desorbers are desorbing, one is cooling, and one is on standby. Each desorber completes two desorption cycles and one cooling cycle sequentially, and then completes unloading, loading, and replacement operations within the fourth cycle. In other words, the sequential operation of the four desorbers ensures that at any given moment, two desorbers are desorbing, one is cooling, and one is on standby, achieving a balanced production process, avoiding equipment idleness and overuse, and improving equipment utilization. Each desorber sequentially completes two desorption cycles and one cooling cycle, and then completes unloading, loading, and replacement operations within the fourth cycle, forming a stable production cycle, which facilitates production planning and management.

[0051] To facilitate understanding, the following will be combined with... Figure 1 Briefly describe the pipeline connection relationship and workflow in the case of four desorbers.

[0052] Reference Figure 1 In Example 1, the continuous VOCs desorption system for activated carbon provided by the present invention includes four desorbers, a heater 2, a dust collector 3, a heat exchanger 4, a desorption condenser 5, a desorption fan 6, a cooling condenser 7, a cooling fan 8, and a solvent tank 9. The working process of the desorption method in an exemplary embodiment of the present invention is as follows:

[0053] 1. Under desorption conditions:

[0054] Open valve 1 and valve 2 of the first desorber T1, valve 1 and valve 2 of the second desorber T2, and close the remaining valves. Connect the first desorber T1 and the second desorber T2 to the desorption circulation gas circuit.

[0055] Desorption fan 6 operates continuously;

[0056] Heater 2 heats the circulating gas to maintain the set temperature;

[0057] The high-temperature desorption circulating gas passes through the first desorber T1 and the second desorber T2, dust collector 3, heat exchanger 4, desorption condenser 5, desorption fan 6, and heat exchanger 4, and returns to heater 2 to complete the cycle.

[0058] During the desorption cycle, the organic material condensed in the desorption condenser 5 is stored in the solvent tank 9.

[0059] 2. Under cooling conditions:

[0060] After the desorption process is completed within the set time period A, valves ① and ② of the third desorber T3 are opened, and the remaining valves are closed. The third desorber T3 is then connected to the desorption circulation gas circuit.

[0061] Close valve 1 and valve 2 of the first desorber T1, and open valve 3 and valve 4 of the first desorber T1. The first desorber T1 then switches from the desorption circulation gas path to the cooling circulation gas path.

[0062] Cooling fan 8 runs continuously;

[0063] The low-temperature circulating gas passes through the first desorber T1, the cooling condenser 7, and the cooling fan 8, and returns to the first desorber T1 to complete the cycle;

[0064] Cooling requires a time cycle A.

[0065] 3. Under cyclic switching conditions:

[0066] After the system runs for one time cycle A, the first desorber T1 completes the cooling process, closes valves 3 and 4 of the first desorber T1, disconnects from the cooling circulation gas path, and the first desorber T1 further performs the unloading and loading operations.

[0067] Close valve 1 and valve 2 of the second desorber T2, and open valve 3 and valve 4 of the second desorber T2. The second desorber T2 will switch from the desorption circulation gas path to the cooling circulation gas path.

[0068] Open valve ① and valve ② of the fourth desorber T4, and close the other valves. The fourth desorber T4 is then connected to the desorption circulation gas circuit.

[0069] 4. In standby (unloading, loading, replacement) conditions:

[0070] When the first desorber T1 is at a safe temperature and is not connected to the desorption circulation gas path and the cooling circulation gas path, it can unload the activated carbon product that has been desorbed inside and refill it with raw material activated carbon.

[0071] The discharge port and loading port of the desorber are not shown in the figure;

[0072] After the first desorber T1 completes unloading and loading, open valves 5 and 6 of the first desorber T1 and introduce low-pressure nitrogen to replace and expel the oxygen in the first desorber T1. After the replacement is completed, close valves 5 and 6.

[0073] The first desorber T1 is connected to the desorption circulation gas path in standby mode.

[0074] 5. Periodic settings:

[0075] According to the above operating mode, in continuous production, there are 2 desorbers performing desorption, 1 desorber performing cooling, and 1 desorber in standby mode at any given moment.

[0076] Each desorber sequentially completes two desorption cycles A, one cooling cycle A, and then completes unloading, loading, and replacement operations within the fourth cycle A.

[0077] In some embodiments, the desorbers are five units arranged in parallel, namely a first desorber T1, a second desorber T2, a third desorber T3, a fourth desorber T4, and a fifth desorber T5. The desorption process includes:

[0078] Under desorption conditions, open valves ① and ② of the first desorber T1, valves ① and ② of the second desorber T2, and valves ① and ② of the third desorber T3, and close the remaining valves. Connect the first desorber T1, the second desorber T2, and the third desorber T3 to the desorption circulation gas path. The desorption fan runs continuously, and the heater 2 heats the circulation gas to maintain the set temperature. The high-temperature desorption circulation gas passes sequentially through the first desorber T1, the second desorber T2, and the third desorber T3 arranged in parallel, as well as the dust collector 3, the heat exchanger 4, the desorption condenser 5, the desorption fan 6, and the heat exchanger 4, before returning to the heater 2 to complete the cycle. During the desorption cycle, the organic material condensed in the desorption condenser is stored in the solvent tank.

[0079] Under cooling conditions, open valve 1 and valve 2 of the fourth desorber T4, close the remaining valves, and connect the fourth desorber T4 to the desorption circulation gas path; close valve 1 and valve 2 of the first desorber T1, open valve 3 and valve 4 of the first desorber T1, and transfer the first desorber T1 from the desorption circulation gas path to the cooling circulation gas path; the cooling fan continues to run; the low-temperature circulating gas passes through the first desorber T1, the cooling condenser 7, and the cooling fan 8, and returns to the first desorber T1 to complete the cycle;

[0080] Under the cyclic switching condition, after the continuous desorption system has been running for one time cycle, the first desorber T1 completes cooling and closes valves 3 and 4 of the first desorber T1 to disconnect from the cooling circulation gas path; the first desorber T1 performs unloading and loading operations; valves 1 and 2 of the second desorber T2 are closed, and valves 3 and 4 of the second desorber T2 are opened, so the second desorber T2 switches from the desorption circulation gas path to the cooling circulation gas path; valves 1 and 2 of the fifth desorber T5 are opened, and the remaining valves are closed, so the fifth desorber T5 is connected to the desorption circulation gas path;

[0081] In standby mode, the first desorber T1, under safe temperature and without being connected to the desorption circulation gas path or the cooling circulation gas path, unloads the activated carbon product that has been desorbed inside and refills it with raw material activated carbon. After the first desorber T1 completes unloading and reloading, valves 5 and 6 of the first desorber T1 are opened to introduce low-pressure nitrogen gas to replace and expel the oxygen in the first desorber T1. After the replacement is completed, valves 5 and 6 are closed. The first desorber T1 is then connected to the desorption circulation gas path in standby mode.

[0082] In this way, during desorption operation, all three desorbers are simultaneously connected to the desorption circulation gas path, improving desorption efficiency. During cooling operation, one desorber performs cooling while the others continue desorption, ensuring production continuity. By switching valves, the desorbers can be quickly switched between different operating conditions, reducing equipment downtime and improving system operating efficiency.

[0083] Furthermore, when there are five desorbers, during continuous production, the five desorbers operate sequentially, ensuring that at any given moment, three desorbers are performing desorption, one is cooling, and one is on standby. Each desorber sequentially completes three desorption cycles and one cooling cycle, and then completes unloading, loading, and replacement operations within the fifth cycle, achieving efficient continuous production. Through a reasonable production cycle arrangement, the equipment's usage time and resource allocation are optimized, improving the overall performance of the system.

[0084] To facilitate understanding, the following will be combined with... Figure 2 Briefly describe the pipeline connection relationship and workflow in the case of five desorbers.

[0085] Reference Figure 2 In Example 2, the continuous desorption system for VOCs in activated carbon provided by the present invention includes five desorbers, as well as heater 2, dust collector 3, heat exchanger 4, desorption condenser 5, desorption fan 6, cooling condenser 7, cooling fan 8 and solvent tank 9.

[0086] The working process of the desorption method in an exemplary embodiment of the present invention is as follows:

[0087] 1. Under desorption conditions:

[0088] Open valves 1 and 2 of the first desorber T1, valves 1 and 2 of the first desorber T2, and valves 1 and 2 of the third desorber T3. Close the remaining valves and connect the three desorbers to the desorption circulation gas circuit.

[0089] Desorption fan 6 operates continuously;

[0090] Heater 2 heats the circulating gas to maintain the set temperature;

[0091] The high-temperature desorption circulating gas passes through the first desorber T1, the second desorber T2 and the second desorber T3 arranged in parallel, as well as the dust collector 3, the heat exchanger 4, the desorption condenser 5, the desorption fan 6 and the heat exchanger 4, and returns to the heater 2 to complete the cycle.

[0092] During the desorption cycle, the organic material condensed in the desorption condenser 5 is stored in the solvent tank 9.

[0093] 2. Under cooling conditions:

[0094] After the desorption process is completed within the set time period A, valves ① and ② of the fourth desorber T4 are opened, and the remaining valves are closed. The fourth desorber T4 is then connected to the desorption circulation gas circuit.

[0095] Close valve 1 and valve 2 of the first desorber T1, and open valve 3 and valve 4 of the first desorber T1. The first desorber T1 then switches from the desorption circulation gas path to the cooling circulation gas path.

[0096] Cooling fan 8 runs continuously;

[0097] The low-temperature circulating gas passes through the first desorber T1, the cooling condenser 7, and the cooling fan 8, and returns to the first desorber T1 to complete the cycle;

[0098] Cooling requires a time cycle A;

[0099] 3. Under cyclic switching conditions:

[0100] After the system runs for one time cycle A, the first desorber T1 completes the cooling process, closes valves 3 and 4 of the first desorber T1, disconnects from the cooling circulation gas path, and the first desorber T1 further performs the unloading and loading operations.

[0101] Close valve 1 and valve 2 of the second desorber T2, and open valve 3 and valve 4 of the second desorber T2. The second desorber T2 will switch from the desorption circulation gas path to the cooling circulation gas path.

[0102] Open valve 1 and valve 2 of the fifth desorber T5, and close the other valves. The fifth desorber T5 is then connected to the desorption circulation gas circuit.

[0103] 4. In standby (unloading, loading, replacement) conditions:

[0104] When the first desorber T1 is at a safe temperature and is not connected to the desorption circulation gas path and the cooling circulation gas path, it can unload the activated carbon product that has been desorbed inside and refill it with raw material activated carbon.

[0105] The discharge port and loading port of the desorber are not shown in the figure;

[0106] After the first desorber T1 completes unloading and loading, open valves 5 and 6 of the first desorber T1 and introduce low-pressure nitrogen to replace and expel the oxygen in the first desorber T1. After the replacement is completed, close valves 5 and 6. The first desorber T1 is then connected to the desorption circulation gas circuit for standby.

[0107] 5. Periodic settings:

[0108] According to the above operating mode, in continuous production, there are 3 desorbers performing desorption, 1 desorber performing cooling, and 1 desorber in standby mode at any given moment.

[0109] Each desorber sequentially completes 3 desorption cycles A, 1 cooling cycle A, and then completes unloading, loading, and replacement operations within the 5th cycle A.

[0110] In some embodiments, the desorbers are six units arranged in parallel, namely a first desorber, a second desorber, a third desorber, a fourth desorber, a fifth desorber, and a sixth desorber.

[0111] Two desorbers can be connected to the desorption circulation gas path, one desorber can be connected to the cooling circulation gas path, and one desorber can be used for unloading and loading, while the other two desorbers are idle. In continuous production, in an instantaneous state, two desorbers are used for desorption, one desorber is used for cooling, one desorber is used for unloading and loading, and the other two desorbers are idle. Each desorber sequentially completes two desorption cycles and one cooling cycle, and then completes the unloading, loading, and replacement operations in the fourth cycle.

[0112] Alternatively, three desorbers can be connected to the desorption circulation gas path, one desorber to the cooling circulation gas path, one desorber for unloading and loading, and one desorber in an idle state. In continuous production, in an instantaneous state, three desorbers are performing desorption, one desorber for cooling, one desorber for unloading and loading, and two desorbers are idle. Each desorber sequentially completes three desorption cycles, one cooling cycle, and then completes the unloading, loading, and replacement operations within the fifth cycle.

[0113] Alternatively, four desorbers can be connected to the desorption circulation gas path, one desorber to the cooling circulation gas path, and one desorber for unloading and loading. In continuous production, in an instantaneous state, four desorbers are performing desorption, one desorber is performing cooling, and one desorber is unloading and loading. Each desorber sequentially completes four desorption cycles and one cooling cycle, and then completes the unloading, loading, and replacement operations within the sixth cycle.

[0114] This allows for multiple operating modes. For example, one mode connects two desorbers to the desorption circulation gas path, one desorber to the cooling circulation gas path, and one desorber for unloading and loading, while the other two are idle. Another mode connects three desorbers to the desorption circulation gas path, one desorber to the cooling circulation gas path, one desorber for unloading and loading, and one desorber is idle. Yet another mode connects four desorbers to the desorption circulation gas path, one desorber to the cooling circulation gas path, and one desorber for unloading and loading. These multiple options enable efficient continuous production, improve production efficiency and equipment utilization, and meet different production needs and equipment operating conditions.

[0115] To facilitate understanding, the following will be combined with... Figure 3 Briefly describe the pipeline connection relationship and workflow in the case of six desorbers.

[0116] Reference Figure 3 In Example 3, the continuous desorption system for VOCs in activated carbon provided by the present invention includes six desorbers (the sixth desorber is T6 based on the above examples), as well as heater 2, dust collector 3, heat exchanger 4, desorption condenser 5, desorption fan 6, cooling condenser 7, cooling fan 8 and solvent tank 9.

[0117] The working process of the desorption method in an exemplary embodiment of the present invention is as follows:

[0118] Of the six desorbers, two can be connected to the desorption circulation gas path, one to the cooling circulation gas path, and one for unloading and loading. With two desorbers idle, production can proceed as described in Example 1.

[0119] Of the six desorbers in total, three can be connected to the desorption circulation gas path, one to the cooling circulation gas path, and one for unloading and loading. With one desorber idle, production can proceed as described in Example 2.

[0120] Of the six desorbers, four can be connected to the desorption circulation gas path, one to the cooling circulation gas path, and one for unloading and loading, ensuring no desorbers are idle. This setup follows the execution method of Example 2. In continuous production, at any given moment, four desorbers are performing desorption, one is cooling, and one is on standby. Each desorber sequentially completes four desorption cycles A, one cooling cycle A, and then completes unloading, loading, and replacement operations within the sixth cycle A.

[0121] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solution of the present invention should be included within the scope of protection of the present invention.

Claims

1. A continuous desorption system for VOCs from activated carbon, characterized in that, include: At least four sets of desorbers are connected in parallel, at least two sets of desorbers are connected to the desorption circulation gas path, one set of desorbers is connected to the cooling circulation gas path, and one set of desorbers is in standby mode. The desorption circulating gas path includes a heater, a dust collector, a heat exchanger, a desorption condenser, and a desorption fan. The dust collector is connected to the outlet of the desorber. The outlet of the dust collector is connected to the desorption condenser through the high-temperature side of the heat exchanger. The outlet of the desorption condenser is connected to the solvent tank. The outlet of the desorption condenser is connected to the desorption fan. The desorption fan is connected to the heater through the low-temperature side of the heat exchanger. The outlet of the heater is connected to each of the desorbers. The cooling circulating air path includes a cooling condenser and a cooling fan connected to the air outlet of the desorber.

2. The continuous VOCs desorption system from activated carbon according to claim 1, characterized in that, The desorbers consist of four units arranged in parallel: a first desorber, a second desorber, a third desorber, and a fourth desorber.

3. The continuous desorption system for VOCs from activated carbon according to claim 2, characterized in that, When there are four desorbers, the desorption process includes: During desorption operation, valves 1 and 2 of the first desorber and valves 1 and 2 of the second desorber are opened, and the remaining valves are closed, connecting the first and second desorbers to the desorption circulation gas path. The desorption fan runs continuously, and the heater heats the circulation gas to maintain the set temperature. The high-temperature desorption circulation gas passes sequentially through the first and second desorbers connected in parallel, as well as the dust collector, heat exchanger, desorption condenser, desorption fan, and heat exchanger, returning to the heater to complete the cycle. During the desorption cycle, the organic material condensed in the desorption condenser is stored in the solvent tank. Under cooling conditions, open valves 1 and 2 of the third desorber, close the remaining valves, and connect the third desorber to the desorption circulation gas path; close valves 1 and 2 of the first desorber, open valves 3 and 4 of the first desorber, and transfer the first desorber from the desorption circulation gas path to the cooling circulation gas path; the cooling fan continues to run; the low-temperature circulating gas passes through the first desorber, the cooling condenser, and the cooling fan, and returns to the first desorber to complete the cycle; Under the cyclic switching condition, after the continuous desorption system has been running for one time cycle, the first desorber completes cooling and closes valves 3 and 4 of the first desorber to disconnect from the cooling circulation gas path; the first desorber performs unloading and loading operations; valves 1 and 2 of the second desorber are closed, and valves 3 and 4 of the second desorber are opened, and the second desorber switches from the desorption circulation gas path to the cooling circulation gas path; valves 1 and 2 of the fourth desorber are opened, and the remaining valves are closed, and the fourth desorber is connected to the desorption circulation gas path; In standby mode, the first desorber, under safe temperature and without being connected to the desorption circulation gas path or cooling circulation gas path, unloads the desorbed activated carbon and refills it with raw material activated carbon. After the first desorber completes unloading and reloading, valves 5 and 6 of the continuous desorption system are opened to introduce low-pressure nitrogen to displace and expel the oxygen in the first desorber. After the displacement is completed, valves 5 and 6 are closed. The first desorber is then connected to the desorption circulation gas path in standby mode.

4. The continuous VOCs desorption system from activated carbon according to claim 3, characterized in that, When there are four desorbers, during continuous production, the four desorbers operate in sequence so that at any given moment, two desorbers are performing desorption, one desorber is cooling down, and one desorber is on standby. Each desorber completes two desorption cycles and one cooling cycle in sequence, and then completes unloading, loading, and replacement operations within the fourth cycle.

5. The continuous VOCs desorption system from activated carbon according to claim 1, characterized in that, The desorbers consist of five units arranged in parallel, namely the first desorber, the second desorber, the third desorber, the fourth desorber, and the fifth desorber.

6. The continuous desorption system for VOCs from activated carbon according to claim 5, characterized in that, When there are five desorbers, the desorption process includes: During desorption, valves 1 and 2 of the first desorber, valves 1 and 2 of the second desorber, and valves 1 and 2 of the third desorber are opened, while the remaining valves are closed. The first, second, and third desorbers are then connected to the desorption circulation gas path. The desorption fan operates continuously, and the heater heats the circulation gas to maintain the set temperature. The high-temperature desorption circulation gas passes sequentially through the first, second, and third desorbers connected in parallel, as well as the dust collector, heat exchanger, desorption condenser, desorption fan, and heat exchanger, before returning to the heater to complete the cycle. During the desorption cycle, the organic material condensed in the desorption condenser is stored in the solvent tank. Under cooling conditions, open valves 1 and 2 of the fourth desorber, close the remaining valves, and connect the fourth desorber to the desorption circulation gas path; close valves 1 and 2 of the first desorber, open valves 3 and 4 of the first desorber, and transfer the first desorber from the desorption circulation gas path to the cooling circulation gas path; the cooling fan continues to run; the low-temperature circulating gas passes through the first desorber, the cooling condenser, and the cooling fan, and returns to the first desorber to complete the cycle; Under the cyclic switching condition, after the continuous desorption system has been running for one time cycle, the first desorber completes cooling and closes its third and fourth valves to disconnect from the cooling circulation gas path; the first desorber performs unloading and loading operations; the first valve of the second desorber and the second desorber's second valve are closed, and the third and fourth valves of the second desorber are opened, so the second desorber switches from the desorption circulation gas path to the cooling circulation gas path; the first valve of the fifth desorber and the second valve of the fifth desorber are opened, and the remaining valves are closed, so the fifth desorber is connected to the desorption circulation gas path; In standby mode, the first desorber, under safe temperature and without being connected to the desorption circulation gas path or cooling circulation gas path, unloads the desorbed activated carbon and refills it with raw material activated carbon. After the first desorber completes unloading and reloading, valves 5 and 6 of the continuous desorption system are opened to introduce low-pressure nitrogen to displace and expel the oxygen in the first desorber. After the displacement is completed, valves 5 and 6 are closed. The first desorber is then connected to the desorption circulation gas path in standby mode.

7. The continuous desorption system for VOCs from activated carbon according to claim 6, characterized in that, When there are five desorbers, during continuous production, the five desorbers operate in sequence so that at any given moment, three desorbers are performing desorption, one desorber is cooling down, and one desorber is on standby. Each desorber completes three desorption cycles and one cooling cycle in sequence, and then completes unloading, loading, and replacement operations within the fifth cycle.

8. The continuous desorption system for VOCs from activated carbon according to claim 1, characterized in that, The desorbers consist of six units arranged in parallel, namely the first desorber, the second desorber, the third desorber, the fourth desorber, the fifth desorber, and the sixth desorber.

9. The continuous desorption system for VOCs from activated carbon according to claim 8, characterized in that, Two desorbers are connected to the desorption circulation gas circuit, one desorber is connected to the cooling circulation gas circuit, and one desorber is used for unloading and loading. The two desorbers are in standby mode. or, Three desorbers are connected to the desorption circulation gas circuit, one desorber is connected to the cooling circulation gas circuit, one desorber is used for unloading and loading, and two desorbers are in standby mode.

10. The continuous desorption system for VOCs from activated carbon according to claim 8, characterized in that, Select four desorbers to connect to the desorption circulation gas circuit, one desorber to connect to the cooling circulation gas circuit, and one desorber for unloading and loading. In continuous production, there are four desorbers performing desorption, one desorber performing cooling, and one desorber in standby mode at any given time. Each desorber sequentially completes four desorption cycles and one cooling cycle, and then completes unloading, loading, and replacement operations within the sixth cycle.

Images