CN111672272B

CN111672272B - A mobile VOCs gas recovery and treatment device in the cleaning process

Info

Publication number: CN111672272B
Application number: CN202010371366.5A
Authority: CN
Inventors: 刘红凯; 朱根民
Original assignee: Zhejiang Ocean University ZJOU
Current assignee: Zhejiang Ocean University ZJOU
Priority date: 2020-05-06
Filing date: 2020-05-06
Publication date: 2022-02-18
Anticipated expiration: 2040-05-06
Also published as: CN111672272A

Abstract

The invention discloses a mobile VOCs gas recovery and treatment device in a tank cleaning process. The adsorber, the second heat exchanger, the heater and the regeneration device of the circulation channel, the adsorber is provided with several adsorption parts filled with adsorbents, and the several adsorption parts can be in different working states, So that the at least two adsorption parts are in the alternate working state of adsorption and desorption. The adsorption part inside the adsorber can be in different working states, and then part of the adsorption part can be in the state of adsorbing VOCs gas, and part of the adsorption part can be in the state of desorption and regeneration. to be regenerated individually.

Description

Gaseous recovery processing device of clear jar process VOCs of portable

Technical Field

The invention belongs to the technical field of environment-friendly instruments, and particularly relates to a movable VOCs gas recovery and treatment device in a tank cleaning process.

Background

In recent years, with the attention of government departments on environmental protection and the personal health of workers, in the industrial cleaning industry, chlorine-based cleaning agents (dichloromethane, trichloroethane and the like), water-based cleaning agents, hydrocarbon-based cleaning agents and the like are adopted to replace the traditional ODS (ozone depletion surfactants) cleaning agents, and hydrocarbon cleaning has the advantages of good cleaning effect, low toxicity, good compatibility with materials, stable performance, recyclability and the like, so that the hydrocarbon cleaning agent is accepted by more and more enterprises. However, since the hydrocarbon cleaning agent is a product or a chemical synthetic product which is subjected to high-grade refining treatment in the petrochemical industry, the hydrocarbon cleaning agent has volatility, and the volatilized gas belongs to Volatile Organic Compounds (VOCs) and has certain pollution to the current environment, but the release of the VOCs after hydrocarbon cleaning does not accord with the established release standard of the VOCs due to factors such as lack of a hydrocarbon gas recovery technology, incomplete treatment and the like in the current cleaning industry, the overproof problem is more and more serious, and the environmental pollution is gradually increased.

The treatment of volatile organic pollutants (VOCs) mainly adopts an adsorption method and a catalytic conversion method. In particular, gas adsorption is gaining increasing attention in the control of volatile organic compounds. Adsorption can reduce the amount of contaminants to trace levels, and therefore, stricter environmental quality requirements, in particular, enhance the attractiveness of adsorption as a method for controlling volatile organic compounds. In addition, when the adsorption method is adopted to purify VOCs, most organic matters can be recycled and reused, and waste recycling is realized, so that the adsorption method becomes a preferred technology for purifying volatile organic matters. The adsorption apparatus is the core of the adsorption system, and there are three types of adsorption apparatuses used in industry, namely, fixed bed, moving bed, and fluidized bed. Fixed bed applications are among these.

Currently, commercial adsorbers for VOCs are predominantly fixed axial beds. The adsorbent is fixed to a certain portion, and the adsorption operation is performed with the adsorbent being stationary. According to the filling mode of the adsorbent, the adsorption device can be divided into a vertical type fixed bed adsorption device and a horizontal type fixed bed adsorption device. In the case of the fixed bed adsorber which is widely used in practical production practice, a vertical fixed bed is basically adopted, the adsorbent is packed in a fixed bed cylinder, and no internal components such as a heat exchanger, a gas flow distribution and the like are arranged inside the fixed bed cylinder, and the basic flow scheme of the use can be described as follows: the waste gas is pretreated to remove dust and impurities, and is adsorbed and purified by an adsorption bed A through a fan, and then is discharged in a safe place after reaching the standard. And when the adsorption of the adsorbate in the adsorption bed A is saturated, the desorption regeneration stage is carried out. The desorption stage can be divided into a steam desorption method and a nitrogen desorption method according to different media. And (3) introducing the desorbed steam (nitrogen) and organic matter mixed gas into a condensation recovery system, starting a fan after desorption is finished, drying the adsorbent by using heated hot air, and then introducing cold air to cool the adsorbent for later use (the nitrogen desorption method does not need the step). The two adsorption beds are controlled by time difference to switch working states in turn.

The prior art is disclosed in patent document No. CN110368779A, which discloses a device and a system for radial adsorption and desorption recovery of VOCs gas, comprising an adsorption and desorption recovery device, a heat exchange device and a pressure-bearing shell; the adsorption device comprises a radial gas distribution cylinder and a central gas collecting cylinder; the radial gas distribution cylinder is sleeved outside the central gas collecting cylinder, and the upper end and the lower end of the radial gas distribution cylinder are fixedly connected through an annular distribution pipe header respectively to form an annular inner cavity; a gap is arranged between the radial gas distribution cylinder and the side tank wall; the winding pipe is wound in the annular inner cavity, a first exhaust channel is arranged below the central gas collecting cylinder, penetrates through the wall of the lower tank and is exhausted out of the tank; the annular inner cavity is filled with an adsorbent to form an adsorbent bed. The method is suitable for recovering the tail gas of the large-air-volume high-concentration multi-component VOCs. Secondary pollution can not be formed, the separated VOCs have no explosion limit and no potential safety hazard, and the service life and the mechanical strength of the adsorbent are prolonged. And improves the production efficiency.

Disclosure of Invention

The invention aims to provide a VOCs gas recovery processing device in a tank cleaning process, which can continuously work, can dynamically adjust the VOCs removal efficiency and can prevent the device from being suffocated and exploded.

The technical scheme adopted by the invention for realizing the purpose is as follows: the utility model provides a gaseous recovery processing device of clear jar process VOCs of portable, includes: the adsorption device comprises a filter, a fan, a first heat exchanger, an adsorber and a second heat exchanger, wherein the filter, the fan, the first heat exchanger and the adsorber are communicated with each other to form a first circulation channel, the adsorber, the second heat exchanger, the heater and the regeneration device are communicated with each other to form a second circulation channel, a plurality of adsorption parts filled with an adsorbent are arranged inside the adsorber, and the adsorption parts can be in different working states, so that at least two adsorption parts are in alternate working states of adsorption and desorption. In the prior art, all the adsorption parts in the adsorber are in the same working state at the same time. For example, the adsorption sections are simultaneously in the adsorption state, or the adsorption sections are simultaneously in the desorption regeneration state. In order to ensure continuous operation, more than two adsorbers are generally required to be connected in parallel and work alternately. That is, when the first adsorber is in adsorption operation, the second adsorber is in desorption regeneration state. The prior art therefore has at least the following disadvantages: one is that the cooperation of more than two adsorbers increases the floor space of the whole VOCs gas recovery processing device and increases the equipment cost of the manufacturer. And the adsorber cannot be suitable for different working conditions and has no wide applicability. When the adsorption part is used, the adsorption part which needs to work simultaneously can be determined according to the inlet pressure of the upstream end, and at the moment, the corresponding adsorption part can be manually controlled to rotate so as to adjust the corresponding first coincidence degree and the second coincidence degree to the maximum. Other adsorption sections that do not need to be used or that need to be desorbed for regeneration may be rotated to minimize the first and second degrees of overlap. That is, the number of the adsorption parts which need to work can be automatically adjusted according to the inlet pressure, and then extra regeneration work is reduced. In addition, different adsorption parts in the adsorbers can be in different working states to ensure the continuity of gas treatment, and the whole process only needs one piece of equipment, so that the floor area of a factory building and the equipment cost of the factory building can be reduced.

The plurality of adsorption parts are arranged adjacently along the axial direction of the adsorbers, each adsorption part can rotate around the central axis of the adsorber so that different adsorption parts can have different working states, and a first loop state which is communicated with each other or a second loop state which is not communicated with each other is formed between two adjacent adsorbers.

The adsorber at least comprises a box body, an exhaust pipe, a gas distribution plate and a plurality of partition plates, wherein the exhaust pipe is arranged in the box body according to the mode that the central axis of the exhaust pipe coincides with the central axis of the box body, the gas distribution plate is sleeved outside the exhaust pipe to separate the box body into a first cavity and a second cavity, the plurality of partition plates are arranged in the second cavity along the axial direction of the box body to separate the second cavity into a plurality of sub-cavities, and the adsorber is arranged in the sub-cavities according to the mode that the exhaust pipe is sleeved outside the exhaust pipe.

The gas distribution plate is provided with a plurality of first air inlets, the adsorption part is provided with a second air inlet and a first exhaust port, the exhaust pipe is provided with a plurality of second exhaust ports, the adsorption part rotates so that the first air inlets are aligned with the second air inlets, and the first exhaust port is aligned with the second exhaust ports, the adsorption part is in a first working state, and the first cavity can be communicated with the exhaust pipe through the adsorption part.

The suction portion is in a second operation state in a case where the suction portion is rotated such that the first intake port is aligned with the second intake port and the first exhaust port is ectopically aligned with the second exhaust port, or in a third operation state in a case where the suction portion is rotated such that the first intake port is ectopically aligned with the second intake port and the first exhaust port is ectopically aligned with the second exhaust port.

In a case where the suction part is rotated such that the first intake port and the second intake port are ectopic and the first exhaust port and the second exhaust port are ectopic, the suction part is in a fourth operation state, and when the suction part is in the fourth operation state, the first chamber cannot communicate with the exhaust pipe through the suction part.

The adsorption part is also provided with at least one third exhaust port, the partition plate is provided with at least one fourth exhaust port, and two adjacent adsorption parts are in the first loop state under the condition that the adsorption part is rotated to enable the third exhaust port to be aligned with the fourth exhaust port, or the adsorption part is rotated to enable the third exhaust port to be ectopic with the fourth exhaust port, and two adjacent adsorption parts are in the second loop state.

When the adjacent first adsorption part and the second adsorption part are in a first loop state, the first adsorption part is in the second working state, and the second adsorption part is in the third working state, the mixed gas with the VOCs gas in the first cavity can move as follows: move along the radial direction of the adsorber to enter the first adsorption part, move along the axial direction of the adsorber to enter the second adsorption part, and move along the radial direction of the adsorption part to enter the exhaust pipe.

In the case where the different adsorption sections are rotated so as to have different operating states, the path length of the movement of the mixed gas in the axial direction of the adsorber can be increased or decreased. In the prior art, the moving path of the mixed gas in the adsorption part is a fixed value, and the inlet pressure of the adsorber is different under different working conditions. When the inlet pressure is small, if the moving path is too large, the resistance at the tail end of the adsorber is too high, so that the inside of the adsorber or the front end of the adsorber is blocked, and when the pressure caused by the blocking is too large, the adsorber has potential safety hazards of explosion. Or when the inlet pressure is higher, if the moving path is too small, the VOCs gas cannot be completely removed, and the exhaust gas does not reach the standard. This application can be according to entry pressure, adjusts the operating condition of each adsorption component, and then changes the removal route of mist in the adsorption component, can reach better VOCs desorption effect finally. Simultaneously, this application can avoid the inside appearance of adsorber to hold back breath, and then can reduce the emergence probability of potential safety hazard.

Each inside cooling tube that all is provided with of absorption portion, cooling tube's first end and second end homoenergetic set up in on the division board.

The invention adopts the adsorption part which can rotate and has different working states, thereby having the following beneficial effects: 1. the inside adsorption part of adsorber can be in different operating condition, and then partial adsorption part can be in the gaseous state of adsorbing VOCs, and partial adsorption part can be in desorption regeneration's state, can make the adsorber continuous operation through the mode of work in turn, need not shut down in order to regenerate alone. 2. Through the operating condition who changes the adsorption portion, can change the length of VOCs's removal route, and then can adjust VOCs's desorption efficiency to can prevent that the device from holding back breath. Therefore, the invention is a VOCs gas recovery processing device in the tank cleaning process, which can continuously work, can dynamically adjust the VOCs removal efficiency and can prevent the device from being suffocated and exploded.

Drawings

FIG. 1 is a schematic view of the modular connection of a preferred apparatus for recovering and treating VOCs gas in a tank cleaning process;

FIG. 2 is a schematic diagram of an adsorber;

FIG. 3 is a schematic view of the position relationship of the adsorption part in the first working state;

FIG. 4 is a schematic view of the position relationship of the adsorption part in the second working state;

FIG. 5 is a schematic view of the position relationship of the adsorption part in the third working state;

FIG. 6 is a schematic view of the position relationship of the suction part in the fourth operating state;

FIG. 7 is an enlarged partial view of the portion A in FIG. 2;

reference numerals: the operation of the filter 1, the fan 2, the heat exchanger comprises a first heat exchanger 3, an adsorber 4, a second heat exchanger 5, a heater 6, a regeneration device 7, a first exhaust passage 4a, a second exhaust passage 4b, a first circulation passage 8, a second circulation passage 9, a base 401, a box 402, a sealing cover 403, an exhaust pipe 404, a first intake passage 405, an adsorption part 406, a first end part 402a, a second end part 402b, a gas distribution plate 407, a partition plate 408, a first cavity 10, a second cavity 11, a sub-cavity 12, a sealing plate 13, a first section 404a, a second section 404b, a first intake port 14, a second intake port 15, a first exhaust port 16, a second exhaust port 17, a third exhaust port 18, a fourth exhaust port 19, a first adsorption part 406a, a second adsorption part 406b, a third adsorption part 406c, a fourth adsorption part 406d, a temperature reduction pipeline 20, a first end 20a, and a second end 20 b.

Detailed Description

The technical solution of the present invention is further described in detail below with reference to the following detailed description and the accompanying drawings:

example 1:

as shown in fig. 1, the device for recovering and processing VOCs gas in the tank cleaning process at least comprises a filter 1, a fan 2, a first heat exchanger 3, an adsorber 4, a second heat exchanger 5, a heater 6 and a regeneration device 7. Upstream of the filter 1, it can be connected to a tank that needs to be industrially cleaned, so that the mixed gas in the tank can enter the filter 1. The filter 1 can filter the mixed gas to filter out large-particle dust and impurities in the mixed gas. The downstream of the filter 1 is connected to a fan 2. The fan 2 can provide circulating power so that the mixed gas treated by the filter 1 can continue to flow to downstream equipment. Downstream of the fan 2 is connected to a first heat exchanger 3. The first heat exchanger 3 can perform heat exchange treatment on the mixed gas to reduce the temperature of the mixed gas. The cooled mixed gas can enter the absorber 4. The adsorber 4 can be an activated carbon adsorber, and then VOCs gas in the mixed gas can be adsorbed through the adsorber 4, so that the purpose of purification is achieved. The gas purified by the adsorber 4 can be discharged directly into the air.

Preferably, the filter 1, the fan 2, the first heat exchanger 3 and the adsorber 4 can form a first circulation path 8. For example, the first exhaust passage 4a of the adsorber 4 may be connected to the inlet of the filter 1. And a sensor for monitoring the concentration of VOCs may be provided in the first exhaust passage 4a of the adsorber. When the concentration of VOCs is detected to be in excess of the standard, the gas from the adsorber 4 may be recycled to the filter 1 and may be re-filtered. The first circulation path 8 is used to perform an adsorption process, i.e., the gas can adsorb VOCs through the adsorber while circulating in the first circulation path 8.

Preferably, the adsorber 4, the second heat exchanger 5, the heater 6 and the regeneration device 7 may constitute a second circulation path 9. The second circulation path 9 is used for the regeneration of the adsorber 4. That is, the adsorbent in the adsorber 4, for example, activated carbon, becomes saturated after a certain period of use, and at this time, regeneration is required so that the adsorbent again has the ability to adsorb VOCs gas. Specifically, downstream of the regeneration device 7 may be connected to the adsorber 4 so that high-temperature nitrogen generated by the regeneration device 7 can enter the adsorber 4, eventually desorbing the adsorbent. Downstream of the adsorber 4 may be connected to a second heat exchanger 5. Downstream of the second heat exchanger 5 may be connected to a regeneration device 7 via a heater 6. The working principle of the second circulation channel 8 is: the regeneration device 7 may generate high temperature nitrogen. After the high-temperature nitrogen enters the regeneration device 7, the temperature of the adsorbent is raised, and the adsorbent is desorbed. The desorbed VOCs gas can exit the adsorber 4 with the high temperature nitrogen and enter the second heat exchanger 5. Second heat exchanger 5 can cool down the mist that VOCs is gaseous and nitrogen gas is constituteed, and then makes VOCs gaseous can condense to obtain VOCs liquid. I.e. the VOCs gas and nitrogen can be separated by the second heat exchanger 5. The separated nitrogen gas can enter a heater 6 for heating. The heated nitrogen is again passed into the regeneration unit 7 to again flow into the adsorber 4. It will be appreciated that the second heat exchanger 5 may be connected to a wastewater treatment system so that the VOCs liquid produced by the second heat exchanger 5 can be further processed.

Preferably, as shown in fig. 2, the adsorber 4 includes at least a base 401, a case 402, a seal cover 403, an exhaust pipe 404, a first air intake passage 405, and a plurality of adsorbers 406. In particular, rollers may be provided on the base 401 to enable the adsorbers 4 to be moved. The case 402 has a hollow cylindrical shape. The first end 402a of the case 402 is open. The second end 402b of the housing 402 is closed. The case 402 is disposed on the base 401. A sealing cover 403 may be provided on the first end portion 402, and the first end portion 402a may be sealed by the sealing cover 403. The upper end of the exhaust pipe 404 penetrates the seal cap 403. The lower end of the exhaust pipe 404 penetrates the second end 402 b. The central axis of the exhaust pipe 404 can substantially coincide with the central axis of the tank 402. The sealing cover 403 is provided with a first air inlet passage 405 so that the mixed gas with the VOCs gas can enter the inside of the case 402. The mixed gas can enter the adsorption unit 406, and the adsorption unit 406 can adsorb the VOCs. The first exhaust passage 4a may be a lower end portion of the exhaust pipe 404. The gas treated by the adsorption part 406 can be discharged through the first exhaust passage 4 a.

Preferably, the adsorber 4 further comprises a gas distribution plate 407 and a plurality of separator plates 408. The gas distribution plate 407 has a hollow cylindrical shape. The central axis of the gas distribution plate 407 coincides with the central axis of the housing 402. The gas distribution plate 407 has an inner diameter greater than the outer diameter of the exhaust pipe 404. The partition plate 408 has an annular shape. The inner diameter of the partition plate 408 is substantially equal to the outer diameter of the exhaust pipe 404 so that the exhaust pipe 404 can be nested in the partition plate 408. The outer diameter of the divider plate 408 is substantially equal to the inner diameter of the gas distribution plate 407 such that the divider plate 408 can nest in the gas distribution plate 407. A plurality of partition plates 408 are arranged along the axial direction and at intervals of the exhaust pipe. The gas distribution plate 407 can divide the chamber body 402 into the first chamber 10 and the second chamber 11 adjacent to each other in the radial direction of the chamber body. The partition plates 408 are disposed in the second cavity 11, and can further partition the second cavity 11 into a plurality of sub-cavities 12.

Preferably, the adsorption part 406 may be disposed in the sub-chamber 12. The exhaust pipe 404 is provided in the sealing plate 13 to divide the exhaust pipe 404 into a first segment 404a and a second segment 404b that are not communicated with each other. The gas distribution plate 407 has a plurality of first gas inlets 14. The outer wall of the adsorption part 406 is provided with a plurality of second air inlets 15. The inner wall of the adsorption part 406 is provided with a plurality of first exhaust ports 16. The first section 404a is provided with a plurality of first exhaust ports 16. The first chamber 10 can communicate with the first section 404a through the first inlet port 14, the second inlet port 15, the first exhaust port 16, and the second exhaust port 17 in this order. The first heat exchanger 3 may communicate with the first inlet passage 405, and thus the mixed gas containing the VOCs first enters the first chamber 10 through the first inlet passage 405. The mixed gas then enters the adsorption part 406 through the first and

second gas inlets

14 and 15 to be subjected to a filtration process. The filtered gas enters the first section 404a through the first exhaust port 16 and the second exhaust port 17 in sequence, and finally exits the adsorber 4 at the lower end of the first section 404a to enter downstream equipment. The lower end of the first section 404a may be in communication with, for example, an exhaust stack, thereby enabling the emission-compliant gas treated in the adsorber 4 to be discharged directly into the atmosphere.

Preferably, the suction portion 406 is coaxial with the exhaust pipe 404. Each of the suction portions 406 is rotatable around the central axis of the exhaust pipe 404. The first degree of overlap of the first intake port 14 and the second intake port 15 and the second degree of overlap of the first exhaust port 16 and the second exhaust port 17 can be adjusted by the rotation of the adsorption part 406. The first degree of overlap and the second degree of overlap refer to the area of overlap of the two apertures. When the two orifices are completely overlapped, the first overlapping degree or the second overlapping degree is the maximum, and the flow rate of the channel formed by the two orifices in unit time can reach the maximum. When the two apertures are completely out of position, the first or second degree of overlap is minimal, and the two apertures do not form a channel for gas flow. It will be appreciated that a drive motor may be provided on each of the divider plates. The driving motor is provided with a gear. The suction unit 406 is provided with teeth engaged with the gear, and further, the rotation of the suction unit can be realized by driving the motor. In the prior art, all the adsorption units 406 in the adsorber 4 are simultaneously in the same operating state. For example, the adsorption section 406 is in the adsorption state at the same time, or the adsorption section 406 is in the desorption regeneration state at the same time. In order to ensure continuous operation, more than two adsorbers 4 are generally required to be alternately operated in parallel. That is, when the first adsorber is in adsorption operation, the second adsorber is in desorption regeneration state. The prior art therefore has at least the following disadvantages: one is that the use of two or more adsorbers 4 increases the floor space of the entire VOCs gas recovery processing apparatus and increases the equipment cost of the manufacturer. And the adsorber cannot be suitable for different working conditions and has no wide applicability. For example, when different tanks are cleaned or VOCs gases from different manufacturers are processed, the gas flow rates are different from each other. In order to prevent the gas from accumulating, the upstream end with larger gas flow needs to adopt a fan 2 with larger power to discharge the gas into the adsorber 4 in time. Or the upstream end with smaller gas flow needs to adopt a fan 2 with smaller power to discharge the gas into the adsorber 4 in time. Which in turn results in the inlet pressures of the adsorbers 4 being different from one another. Generally, as the inlet pressure increases, more adsorbent sections 406 are required to operate to increase filtration efficiency. When the inlet pressure is lower, a higher filtering effect can be achieved by the operation of fewer adsorption parts 406, and at the moment, the simultaneous operation of excessive adsorption parts 406 will result in additional regeneration operation, which is not favorable for improving the gas treatment efficiency. When the application is used, the adsorption parts 406 which need to work simultaneously can be determined according to the inlet pressure at the upstream end, and at the moment, the corresponding adsorption parts 406 can be manually controlled to rotate so as to adjust the corresponding first coincidence degree and the second coincidence degree to the maximum. Other adsorption sections 406 that are not needed or that require desorption regeneration may be rotated to minimize their first and second degrees of overlap. That is, according to the present invention, the number of adsorption units 406 that need to be operated can be automatically adjusted according to the inlet pressure, thereby reducing additional regeneration operations. In addition, different adsorption parts 406 in the adsorber can be in different working states to ensure the continuity of gas treatment, and only one piece of equipment is needed in the whole process, so that the floor area of a plant and the equipment cost of the plant can be reduced.

Preferably, as shown in fig. 3 to 6, the suction portion 406 can be brought into four operation states different from each other by rotating the suction portion 406. The first operation state is that the adsorption part 406 is simultaneously communicated with the first chamber 10 and the exhaust pipe 404. The second operating state is that the adsorption part 406 is in communication with the first chamber 10 and is not in communication with the exhaust pipe 404. The third operating state is where the adsorber is not in communication with the first chamber 10 and is in communication with the exhaust pipe 404. In the fourth operating state, the suction portion 406 is not connected to the first chamber 10 or the exhaust pipe 404. Specifically, the gas distribution plate 407 may be provided with at least two first gas inlets 14, and when the first gas inlets 14 are aligned with the second gas inlets 15, the adsorption part 406 is communicated with the first chamber 10. The exhaust pipe 404 is provided with at least two second exhaust ports 17. When the first exhaust port 16 is aligned with the second exhaust port 17, the adsorption part 406 communicates with the exhaust pipe 404.

Preferably, the adsorption part 406 is further provided with a plurality of third exhaust ports 18. The partition plate 408 is provided with a plurality of fourth exhaust ports 19. Two adjacent adsorption portions 406 can be in a first circuit state in which they are communicated with each other, or in a second circuit state in which they are not communicated with each other. For example, when the adsorption part 406 is rotated such that the third exhaust port 18 and the fourth exhaust port 19 are aligned, adjacent two adsorption parts are in the first loop state. When the adsorption part 406 rotates such that the third exhaust port 18 and the fourth exhaust port 19 are dislocated, the adjacent two adsorption parts are in the second circuit state.

Preferably, two adjacent suction portions 406 can have different operation states from each other. For example, as shown in fig. 1 and 2, the suction portions are named a first suction portion 406a, a second suction portion 406b, a third suction portion 406c, and a fourth suction portion 406d in this order from the top. The first adsorption part 406a may be in the first operation state, the second adsorption part 406b, the third adsorption part 406c, and the fourth adsorption part 406d are in the fourth operation state, and two adjacent adsorption parts are in the second circuit state, at this time, the mixed gas in the first chamber 10 can only enter the first adsorption part 406a, and the gas treated by the first adsorption part 406a can only move in the radial direction of the box 402 to enter the first segment 404 a. For example, in the case where first adsorption part 406a is in the second operation state, second adsorption part 406b and third adsorption part 406c are both in the fourth operation state, fourth adsorption part 406d is in the third operation state, and two adjacent adsorption parts are both in the first loop state, the mixed gas in first chamber 10 first enters first adsorption part 406a along the radial direction of tank 402, then enters second adsorption part 406b, third adsorption part 406c and fourth adsorption part 406d along the axial direction of tank 402, and finally enters exhaust pipe 404 through first exhaust port 16 of fourth adsorption part 406 d. At this time, the moving path of the mixed gas in the adsorption part 406 is increased, and the filtering effect of the VOCs can be increased. It is understood that the length of the moving path of the mixed gas in the adsorption part can be increased or shortened by adjusting the operation state of each adsorption part. For example, when first adsorption part 406a is in the second operation state, second adsorption part 406b and fourth adsorption part 406d are in the fourth operation state, third adsorption part 406c is in the third operation state, first loop state exists among first adsorption part 406a, second adsorption part 406b and third adsorption part 406c, and second loop state exists among third adsorption part 406c and fourth adsorption part 406d, the mixed gas in the first chamber first enters first adsorption part 406a, then sequentially enters second adsorption part 406b and third adsorption part 406c in the radial direction of case 402, and finally enters exhaust pipe 404 through first exhaust port 16 of third adsorption part 406 c. In the prior art, the moving path of the mixed gas in the adsorption part is a fixed value, and the inlet pressure of the adsorber 4 is different under different working conditions. When the inlet pressure is small, if the moving path is too large, the resistance at the tail end of the adsorber 4 is too high, so that the inside of the adsorber 4 or the front end of the adsorber is blocked, and when the pressure caused by the blocking is too large, the adsorber 4 has potential safety hazards of explosion. Or when the inlet pressure is higher, if the moving path is too small, the VOCs gas cannot be completely removed, and the exhaust gas does not reach the standard. This application can be according to entry pressure, adjusts the operating condition of each adsorption component, and then changes the removal route of mist in the adsorption component, can reach better VOCs desorption effect finally. Simultaneously, this application can avoid the inside appearance of adsorber to hold back breath, and then can reduce the emergence probability of potential safety hazard.

Preferably, as shown in fig. 1 and 7, the adsorption part 406 may be hollow, so that the adsorption part 406 may be filled with an adsorbent. Each of the adsorption portions 406 is provided therein with a temperature reduction duct 20. It is understood that the cooling conduit 20 may have various wiring patterns, such as a spiral pattern or a bent pattern, in order to increase the contact area between the cooling conduit 20 and the adsorbent. Both the first end 20a and the second end 20b of the temperature reduction duct 20 can be fixed to the partition plate 408. The first end 20a can be in communication with the second segment 404 b. The upstream of the second section 404b may be connected to the regeneration device 7, so that the high-temperature nitrogen generated by the regeneration device 7 can enter the temperature reduction pipeline 20 through the second section. Finally, the cooling pipeline 20 can heat the adsorbent, so that the adsorbent can be desorbed and regenerated. The case 402 is provided with a second exhaust passage 4 b. The second exhaust passage 4b is located in the first cavity 10. The second end 20b of the temperature decrease duct 20 communicates with the second exhaust passage 4 b. And the nitrogen gas after temperature reduction in the temperature reduction pipeline 20 can be discharged out of the adsorber 4 through the second exhaust passage 4 b. The downstream of the second exhaust passage 4b may be connected to a heater 6. Thereby enabling the nitrogen gas to be recycled in the second circulation passage 9.

Claims

1. A mobile VOCs gas recovery and treatment device in a tank cleaning process, comprising: a filter (1), a fan (2), a first heat exchanger (3) and a filter (1), a fan (2), a first heat exchanger (3) and an adsorber (4), and said adsorber (4), a second heat exchanger (5), a heater (6) and a regeneration device (7) communicating with each other to form a second circulation channel (9), said The downstream of the regeneration device (7) is connected to the adsorber (4), the nitrogen generated by the regeneration device (7) enters the adsorber (4), and is characterized in that: the adsorber (4) is provided with a number of filling There are adsorption parts (406) for adsorbents, and the plurality of adsorption parts (406) can be in different working states, so that at least two adsorption parts (406) are in alternate working states of adsorption and desorption;

The plurality of adsorption parts (406) are adjacently arranged along the axial direction of the adsorber (4), and each adsorption part (406) can rotate around the central axis of the adsorber (4) so that different adsorption parts (406) Can have different working states, and make two adjacent adsorbers (4) have a first loop state that communicates with each other or a second loop state that is not communicated with each other;

The adsorber (4) at least comprises a box (402), an exhaust pipe (404), a gas distribution plate (407) and several partition plates (408), and the exhaust pipe (404) is aligned with the center axis of the exhaust pipe (404). The box body (402) is arranged in the box body (402) in such a way that the central axes of the box body (402) overlap, and the gas distribution plate (407) is sleeved outside the exhaust pipe (404) to separate the box body (402) into The first cavity (10) and the second cavity (11), the plurality of partition plates (408) are arranged in the second cavity (11) along the axial direction of the box body (402) to separate the The second cavity (11) is divided into several sub-cavities (12), and the adsorber (4) is arranged in the sub-cavities (12) in a manner of being sleeved outside the exhaust pipe (404). ;

The gas distribution plate (407) is provided with a plurality of first air inlets (14), and the adsorption part (406) is provided with a second air inlet (15) and a first air outlet (16), so The exhaust pipe (404) is provided with a plurality of second exhaust ports (17), and the adsorption part (406) is rotated to make the first air inlet (14) and the second air inlet When (15) is aligned, and the first exhaust port (16) is aligned with the second exhaust port (17), the adsorption part (406) is in a first working state, so that the first exhaust port (16) is aligned with the second exhaust port (17). The cavity (10) can communicate with the exhaust pipe (404) through the adsorption part (406);

The adsorption part (406) is coaxial with the exhaust pipe (404), and each adsorption part (406) can rotate around the central axis of the exhaust pipe (404). The first degree of coincidence of the first air inlet (14) and the second air inlet (15), and the second degree of coincidence of the first exhaust port (16) and the second exhaust port (17) are adjusted, and the first degree of coincidence is adjusted. The first degree of coincidence and the second degree of coincidence refer to the overlapping area of the two holes. When the two holes are completely coincident, the first degree of coincidence or the second degree of coincidence is the largest. At this time, the flow rate of the channel formed by the two holes per unit time It can reach the maximum. When the two holes are completely out of position, the first degree of coincidence or the second degree of coincidence is the smallest. At this time, the two holes will not form a channel for gas flow, and a driver is provided on each partition plate (408). The motor, the driving motor is provided with a gear, the adsorption part (406) is provided with teeth meshing with the gear, and the rotation of the adsorption part is realized by driving the motor.

2 . The VOCs gas recovery and treatment device in the tank cleaning process according to claim 1 , wherein the adsorption part ( 406 ) is rotated so that the first air inlet ( 14 ) is connected to the second air inlet. 3 . When the port (15) is aligned, and the first exhaust port (16) and the second exhaust port (17) are in different positions, the adsorption part (406) is in the second working state, or the adsorption part (406) is in the second working state. The adsorption part (406) is arranged so that the first air inlet (14) and the second air inlet (15) are in different positions, and the first exhaust port (16) and the second exhaust When the ports (17) are aligned, the suction part (406) is in the third working state.

3. The VOCs gas recovery and treatment device in the tank cleaning process according to claim 2, wherein the adsorption part (406) is rotated so that the first air inlet (14) is connected to the second air inlet. When the first exhaust port (16) is different from the second exhaust port (17), the adsorption part (406) is in the fourth working state, when the adsorption part (406) When in the fourth working state, the first cavity (10) cannot communicate with the exhaust pipe (404) through the adsorption part (406).

4. The VOCs gas recovery and processing device according to claim 3, characterized in that: the adsorption part (406) is also provided with at least one third exhaust port (18), and the partition plate ( 408) is provided with at least one fourth exhaust port (19), and when the adsorption part (406) is rotated so that the third exhaust port (18) is aligned with the fourth exhaust port (19) In this case, the two adjacent adsorption parts (406) are in the first circuit state, or the adsorption part (406) is rotated so that the third exhaust port (18) is connected to the fourth exhaust gas When the port (19) is out of position, the two adjacent adsorption parts (406) are in the second circuit state.

5. The VOCs gas recovery and treatment device in a tank cleaning process according to claim 4, wherein the adjacent first adsorption part (406a) and the second adsorption part (406b) are in a first loop state, and the When the first adsorption part (406a) is in the second working state, and the second adsorption part (406b) is in the third working state, the mixture of the gas with VOCs in the first cavity (10) The gas can move in the following ways: in the radial direction of the adsorber (4) to enter the first adsorption part (406a), in the axial direction of the adsorber (4) to enter the second adsorption part (406b), along the Radial movement of the adsorber (4) to enter the exhaust pipe (404).

6. The VOCs gas recovery and processing device according to claim 5, characterized in that: in the case of rotating different adsorption parts (406) to make them have different working states, the mixed gas flows along the adsorber (406). ) of the axial movement path length can be increased or decreased.

7. The tank cleaning process VOCs gas recovery and processing device according to claim 6, characterized in that: each adsorption part (406) is internally provided with a cooling pipe (20), and the first end (20a of the cooling pipe (20) is provided with a cooling pipe (20). ) and the second end (20b) can both be disposed on the divider plate (408).