CN111672272A - A mobile VOCs gas recovery and treatment device in the cleaning process - Google Patents

Abstract

The invention discloses a mobile VOCs gas recovery processing device in the tank cleaning process, which comprises: 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. 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.

Description

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

technical field

The invention belongs to the technical field of environmental protection equipment, and in particular relates to a mobile VOCs gas recovery and treatment device in a tank cleaning process.

Background technique

In recent years, with the government's emphasis on environmental protection and workers' personal health, in the industrial cleaning industry, chlorine-based cleaning agents (dichloromethane, trichloroethane, etc.), water-based cleaning agents and hydrocarbon-based cleaning agents are used. Hydrocarbon cleaning agents are used to replace traditional ODS (Ozone Depleting Substances) cleaning agents, while hydrocarbon cleaning is more and more popular due to its good cleaning effect, low toxicity, good compatibility with materials, stable performance, and recyclability. More and more companies are recognized. However, since hydrocarbon-based cleaning agents are products or chemical synthetics that have undergone advanced refining treatment from the petrochemical industry, they are volatile, and the volatilized gases belong to volatile organic compounds (VOCs, volatile organic compounds), which are harmful to the current environment. Certain pollution, but the current cleaning industry due to the lack of hydrocarbon gas recovery technology, incomplete treatment and other factors, the VOCs emission after hydrocarbon cleaning does not meet the established VOCs emission standards, the problem of exceeding the standard is becoming more and more serious, and the environmental pollution is gradually increasing. big.

The treatment of volatile organic pollutants (VOCs) mainly adopts adsorption method and catalytic conversion method. In particular, gas adsorption has received increasing attention in the control of volatile organic compounds. Since adsorption can reduce pollutants to trace levels, stricter environmental quality requirements have especially enhanced the attractiveness of adsorption as a method for controlling volatile organic compounds. In addition, while the adsorption method is used to purify VOCs, most of the organic matter can also be recovered and reused to realize the recycling of waste, making the adsorption method the preferred technology for purifying volatile organic compounds. The adsorption device is the core of the adsorption system. There are three types of adsorption devices used in industry, namely fixed bed, moving bed and fluidized bed. Among them, the fixed bed is widely used.

At present, the adsorbers for industrial treatment of VOCs are dominated by axial fixed beds. The adsorbent is fixed on a certain position, and the adsorption operation is performed when the adsorbent is stationary. According to the filling method of the adsorbent, it can be divided into vertical and horizontal fixed bed adsorption devices. As for the fixed bed adsorber that has been widely used in actual production practice, a vertical fixed bed is basically used, and the adsorbent is packed in a fixed bed cylinder without internal components, such as heat exchangers and airflow distribution. The basic process can be described: the exhaust gas is pretreated to remove dust and impurities, and after being adsorbed and purified by the adsorption bed A, the exhaust gas is discharged in a safe place. When the adsorbent bed A is saturated with adsorbent, it enters the desorption regeneration stage. The desorption stage can be divided into steam desorption method and nitrogen desorption method according to different media. The desorbed steam (nitrogen) and the organic mixture enter the condensation recovery system. After the desorption is completed, the fan is started again, and the heated hot air is used to dry the adsorbent. Then, cool air is introduced to cool the adsorbent. , standby (nitrogen desorption method does not need this step). The two adsorption beds are controlled by the time difference, and the working states are switched alternately.

The prior art is such as the patent document of publication number CN110368779A, which discloses a VOCs gas radial adsorption and desorption recovery device and system, including an adsorption and desorption recovery device, a heat exchange device and a pressure-bearing shell; the adsorption The device includes a radial gas distribution cylinder and a central gas collecting cylinder; the radial gas distribution cylinder is sleeved on the outside of the central gas collecting cylinder, and the upper and lower ends are respectively fixedly connected by an annular distribution pipe header to form an annular inner cavity; There is a gap between the distribution cylinder and the side tank wall; the winding pipe is wound in the annular inner cavity, and a first exhaust channel is arranged under the central gas collecting cylinder, which passes through the lower tank wall and is discharged out of the tank; The adsorbent is filled in the inner cavity to form an adsorbent bed. It is suitable for the recovery of exhaust gas with large air volume, high concentration and multi-component VOCs. No secondary pollution will be formed, and the VOCs released have no explosion limit and no potential safety hazard, which prolongs the service life and mechanical strength of the adsorbent. And improve production efficiency.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a VOCs gas recovery and treatment device in a tank cleaning process that can work continuously, the VOCs removal efficiency can be dynamically adjusted, and can prevent the device from suffocating and exploding.

The technical scheme adopted by the present invention to achieve the above purpose is: a mobile VOCs gas recovery and treatment device in a tank cleaning process, comprising: a filter, a fan, a first heat exchanger and an adsorption device that are communicated with each other to form a first circulation channel The adsorber, the second heat exchanger, the heater and the regeneration device communicated with each other to form the second circulation channel, the adsorber is provided with a number of adsorption parts filled with adsorbent, the several 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 adsorption parts in the adsorber are in the same working state at the same time. For example, the adsorption part is in the adsorption state at the same time, or the adsorption part is in the desorption regeneration state at the same time. In order to ensure continuous operation, more than two adsorbers are generally required to work alternately in parallel. That is to say, when the first adsorber is in the adsorption operation, the second adsorber is in the desorption regeneration state. Therefore, the prior art has at least the following defects: First, the coordinated use of two or more adsorbers will increase the floor space of the entire VOCs gas recovery and treatment device, and increase the equipment cost of the manufacturer. Both, the adsorber cannot be applied to different working conditions and does not have wide applicability. When the application is used, firstly, the adsorption parts that need to work simultaneously can be determined according to the inlet pressure of the upstream end. At this time, the rotation of the corresponding adsorption parts can be manually controlled to adjust the corresponding first and second coincidence degrees to maximum. Other adsorption parts that do not need to be used or adsorption parts that need to be desorbed and regenerated can be rotated so as to minimize their first and second overlapping degrees. That is, the present application can automatically adjust the number of adsorption parts that need to work according to the inlet pressure, thereby reducing additional regeneration work. In addition, different adsorption parts inside the adsorber can be in different working states to ensure the continuity of gas treatment. Only one piece of equipment is required for the whole process, so it can reduce the floor space of the plant and the equipment cost of the manufacturer.

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

The adsorber at least includes a box body, an exhaust pipe, a gas partition plate and a plurality of partition plates, and the exhaust pipe is arranged in the box body in a manner that the center axis of the exhaust pipe coincides with the center axis of the box body. The gas partition plate is sleeved outside the exhaust pipe to separate the box into a first cavity and a second cavity, and the plurality of partition plates are arranged in the second cavity along the axial direction of the box. In the above, the second cavity is divided into several sub-cavities, and the adsorber is arranged in the sub-cavities in a manner of being sleeved outside the exhaust pipe.

The gas partition plate is provided with a number of first air inlets, the adsorption part is provided with a second air inlet and a first exhaust port, and the exhaust pipe is provided with a number of second exhaust ports , in the case of rotating the adsorption part so that the first air inlet is aligned with the second air inlet and the first air outlet is aligned with the second air outlet, the adsorption The part is in a first working state, so that the first cavity can communicate with the exhaust pipe through the adsorption part.

In the case where the adsorption part is rotated so that the first intake port and the second air intake port are aligned, and the first exhaust port and the second exhaust port are out of position, the adsorption part In the second working state, or rotating the adsorption part so that the first air inlet and the second air inlet are out of position, and the first air outlet and the second air outlet are aligned In the case of , the adsorption part is in the third working state.

When the adsorption part is rotated so that the first intake port and the second intake port are out of position, and the first exhaust port and the second exhaust port are out of position, the adsorption The suction part is in a fourth working state, and when the adsorption part is in the fourth working state, the first cavity cannot communicate with the exhaust pipe through the suction part.

The adsorption part is also provided with at least one third exhaust port, and the partition plate is provided with at least one fourth exhaust port, and the adsorption part is rotated to make the third exhaust port and the When the fourth exhaust port is aligned, the two adjacent adsorption parts are in the first circuit state, or the adsorption part is rotated so that the third exhaust port is different from the fourth exhaust port. In the case of the position, the two adjacent adsorption parts are in the second loop state.

When the adjacent first adsorption part and the second adsorption part are in the first circuit state, the first adsorption part is in the second operation state, and the second adsorption part is in the third operation state , the mixed gas with 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, Move in the radial direction of the adsorption part to enter the exhaust pipe.

In the case where the different adsorption parts are rotated so that they have different working states, the path length of the mixed gas moving 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 under different working conditions, the inlet pressure of the adsorber will be different. When the inlet pressure is small, if the moving path is too large, the resistance at the end of the adsorber will be too high, and then the inside of the adsorber or its front end will hold air. Or when the inlet pressure is high, if the moving path is too small, the VOCs gas will not be completely removed at this time, resulting in substandard emission gas. In the present application, the working state of each adsorption part can be adjusted according to the inlet pressure, thereby changing the moving path of the mixed gas in the adsorption part, and finally a better VOCs removal effect can be achieved. At the same time, the present application can avoid the occurrence of suffocation inside the adsorber, thereby reducing the occurrence probability of potential safety hazards.

A cooling pipe is arranged inside each adsorption part, and both the first end and the second end of the cooling pipe can be arranged on the partition plate.

The present invention has the following beneficial effects due to the use of the adsorption part that can be rotated and has different working states: 1. 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, Part of the adsorption part can be in the state of desorption and regeneration, and the adsorber can continue to work by means of alternate operation, and the regeneration can be carried out independently without stopping. 2. By changing the working state of the adsorption part, the length of the moving path of VOCs can be changed, thereby adjusting the removal efficiency of VOCs and preventing the device from suffocating. Therefore, the present invention is a VOCs gas recovery and treatment device in a tank cleaning process that can work continuously, the VOCs removal efficiency can be dynamically adjusted, and can prevent the device from suffocating and exploding.

Description of drawings

Fig. 1 is the schematic diagram of the modular connection relationship of the preferred tank cleaning process VOCs gas recovery and processing device of the application;

Fig. 2 is the structural representation of adsorber;

3 is a schematic diagram of the positional relationship of the adsorption part when it is in a first working state;

FIG. 4 is a schematic diagram of the positional relationship of the adsorption part when it is in the second working state;

5 is a schematic diagram of the positional relationship of the adsorption part when it is in a third working state;

6 is a schematic diagram of the positional relationship of the adsorption part when it is in a fourth working state;

Fig. 7 is the partial enlarged schematic diagram of part A in Fig. 2;

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

Detailed ways

The technical solutions of the present invention are described in further detail below in conjunction with the specific embodiments and the accompanying drawings:

Example 1:

As shown in Figure 1, the VOCs gas recovery and treatment device in the tank cleaning process of the present application at least includes 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. The upstream of the filter 1 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 therein. Downstream of filter 1 is connected to fan 2 . The fan 2 can provide circulating power, so that the mixed gas treated by the filter 1 can continue to flow to the downstream equipment. Downstream of the blower 2 is connected to the first heat exchanger 3 . The first heat exchanger 3 can perform heat exchange treatment on the mixed gas to reduce its temperature. The cooled mixed gas can enter the adsorber 4 . The adsorber 4 can be an activated carbon adsorber, and then the VOCs gas in the mixed gas can be adsorbed by the adsorber 4, so as to achieve the purpose of purification. Finally, the gas purified by the adsorber 4 can be directly discharged into the air.

Preferably, the filter 1 , the fan 2 , the first heat exchanger 3 and the adsorber 4 can form the first circulation channel 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 it is detected that the concentration of VOCs exceeds the standard, the gas discharged from the adsorber 4 can be circulated into the filter 1, and then can be filtered again. The first circulation channel 8 is used for adsorption treatment, that is, when the gas circulates in the first circulation channel 8, the VOCs can be adsorbed by the adsorber.

Preferably, the adsorber 4 , the second heat exchanger 5 , the heater 6 and the regeneration device 7 can form the second circulation channel 9 . The second circulation channel 9 is used for the regeneration of the adsorber 4 . That is, the adsorbent such as activated carbon in the adsorber 4 will reach saturation after being used for a period of time, and at this time, regeneration is required to make the adsorbent have the ability to adsorb VOCs gas again. Specifically, the downstream of the regeneration device 7 can be connected to the adsorber 4, so that the high-temperature nitrogen gas generated by the regeneration device 7 can enter the adsorber 4, and finally desorb the adsorbent. Downstream of the adsorber 4 can be connected to a second heat exchanger 5 . Downstream of the second heat exchanger 5 can be connected to a regeneration device 7 via a heater 6 . The working principle of the second circulation channel 8 is that the regeneration device 7 can generate high-temperature nitrogen gas. After the high-temperature nitrogen enters the regeneration device 7, the temperature of the adsorbent will be increased, thereby causing the adsorbent to desorb. The desorbed VOCs gas can be discharged from the adsorber 4 together with the high-temperature nitrogen gas and enter the second heat exchanger 5 . The second heat exchanger 5 can cool the mixed gas composed of the VOCs gas and nitrogen, so that the VOCs gas can be condensed, thereby obtaining the VOCs liquid. That is, the VOCs gas and nitrogen gas can be separated by the second heat exchanger 5 . The separated nitrogen can enter the heater 6 for heating. The heated nitrogen gas is passed through the regeneration device 7 again to flow into the adsorber 4 again. It can be understood that the second heat exchanger 5 can be connected to a waste water 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 at least includes a base 401 , a box body 402 , a sealing cover 403 , an exhaust pipe 404 , a first intake passage 405 and several adsorption parts 406 . Specifically, the base 401 may be provided with a roller, so that the adsorber 4 can be moved. The box body 402 has a hollow cylindrical shape. The first end portion 402a of the box body 402 is open. The second end portion 402b of the box body 402 is closed. The box body 402 is arranged on the base 401 . The sealing cover 403 can be disposed on the first end portion 402 , and the first end portion 402 a can be sealed by the sealing cover 403 . The upper end of the exhaust pipe 404 penetrates the sealing cover 403 . The lower end of the exhaust pipe 404 penetrates the second end portion 402b. The central axis of the exhaust pipe 404 can be substantially coincident with the central axis of the casing 402 . A first air inlet channel 405 is provided on the sealing cover 403 , so that the mixed gas with VOCs gas can enter the inside of the box body 402 . The mixed gas can enter the adsorption part 406 , and then the VOCs gas can be adsorbed by the adsorption part 406 . The first exhaust passage 4a may be the lower end portion of the exhaust pipe 404 . After being processed by the adsorption unit 406, the gas can be discharged through the first exhaust passage 4a.

Preferably, the adsorber 4 further includes a gas distribution plate 407 and several partition 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 box body 402 . The inner diameter of the gas distribution plate 407 is larger than the outer diameter of the exhaust pipe 404 . The partition plate 408 is annular. The inner diameter of the divider plate 408 is approximately equal to the outer diameter of the exhaust pipe 404 so that the exhaust pipe 404 can be nested within the divider plate 408 . The outer diameter of the partition plate 408 is approximately equal to the inner diameter of the gas distribution plate 407 so that the partition plate 408 can be nested in the gas distribution plate 407 . A number of partition plates 408 are arranged along the axial direction of the exhaust pipe and at intervals. The gas distribution plate 407 can partition the tank 402 into the first cavity 10 and the second cavity 11 which are adjacent to each other in the radial direction of the tank. A plurality of partition plates 408 are disposed in the second cavity 11 , so that the second cavity 11 can be divided into a plurality of sub-cavities 12 .

Preferably, the adsorption part 406 may be disposed in the sub-cavity 12 . The exhaust pipe 404 is provided in the sealing plate 13 to partition the exhaust pipe 404 into a first section 404a and a second section 404b which are not communicated with each other. Several first air inlets 14 are provided on the gas distribution plate 407 . Several second air inlets 15 are provided on the outer wall of the adsorption part 406 . A plurality of first exhaust ports 16 are provided on the inner wall of the adsorption part 406 . A plurality of first exhaust ports 17 are provided on the first section 404a. The first cavity 10 can be communicated with the first section 404 a through the first air inlet 14 , the first air inlet 15 , the first air outlet 16 and the second air outlet 17 in sequence. The first heat exchanger 3 may be communicated with the first intake passage 405 , and the mixed gas containing VOCs gas first enters the first cavity 10 through the first intake passage 405 . Then, the mixed gas enters the adsorption part 406 through the first air inlet 14 and the second air inlet 15 to be filtered. 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 from the lower end of the first section 404a to enter the downstream equipment. The lower end of the first section 404a can be communicated with, for example, an exhaust chimney, so that the gas that meets the emission standard after being processed in the adsorber 4 can be directly discharged into the atmosphere.

Preferably, the adsorption part 406 is coaxial with the exhaust pipe 404 . Each adsorption part 406 can rotate around the central axis of the exhaust pipe 404 . By the rotation of the adsorption part 406 , the first degree of overlap between the first intake port 14 and the second intake port 15 and the second degree of overlap between the first exhaust port 16 and the second exhaust port 17 can be 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 coincidence degree or the second coincidence degree is the largest, and the flow rate of the channel formed by the two holes can reach the maximum per unit time at this time. When the two holes are completely out of position, the first coincidence degree or the second coincidence degree is the smallest, and at this time, the two holes will not form a channel for gas flow. It can be understood that a drive motor may be provided on each of the partitions. The drive motor is provided with gears. The adsorption part 406 is provided with teeth meshing with the gears, and the rotation of the adsorption part can be realized by driving the motor. In the prior art, all the adsorption parts 406 in the adsorber 4 are in the same working state at the same time. For example, the adsorption part 406 is in the adsorption state at the same time, or the adsorption part 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 operate alternately in parallel. That is to say, when the first adsorber is in the adsorption operation, the second adsorber is in the desorption regeneration state. Therefore, the prior art has at least the following defects: First, the coordinated use of two or more adsorbers 4 will increase the footprint of the entire VOCs gas recovery and treatment device, and increase the equipment cost of the manufacturer. Both, the adsorber cannot be applied to different working conditions and does not have wide applicability. For example, when cleaning different tanks or treating VOCs generated by different manufacturers, the gas flow rates are different from each other. In order to prevent the gas from accumulating, the upstream end where the gas flow rate is larger needs to use a fan 2 with a larger power to discharge the gas into the adsorber 4 in time. Or at the upstream end where the gas flow rate is small, a fan 2 with a small power needs to be used to discharge the gas into the adsorber 4 in time. This in turn causes the inlet pressures of the adsorbers 4 to be different from each other. Generally, when the inlet pressure is higher, more adsorption parts 406 are required to work to improve the filtration efficiency. The smaller the inlet pressure is, the higher the filtration effect can be achieved through the operation of fewer adsorption parts 406 . At this time, too many adsorption parts 406 work simultaneously will lead to additional regeneration work, which is not conducive to the improvement of gas treatment efficiency. When the application is used, firstly, the adsorption parts 406 that need to work simultaneously can be determined according to the inlet pressure at the upstream end. Adjust to maximum. Other adsorption parts 406 that do not need to be used or adsorption parts that need to be desorbed and regenerated can be rotated so as to minimize their first and second overlapping degrees. That is, the present application can automatically adjust the number of adsorption parts 406 that need to work according to the inlet pressure, thereby reducing additional regeneration work. In addition, different adsorption parts 406 inside the adsorber can be in different working states to ensure the continuity of gas treatment. Only one piece of equipment is required for the whole process, so the floor space of the plant and the equipment cost of the manufacturer can be reduced.

Preferably, as shown in FIG. 3 to FIG. 6 , by rotating the adsorption part 406 , the adsorption part 406 can be in four different working states. The first working state is that the adsorption part 406 communicates with the first cavity 10 and the exhaust pipe 404 at the same time. The second working state is that the adsorption part 406 communicates with the first cavity 10 and is not communicated with the exhaust pipe 404 . The third working state is that the adsorber is not in communication with the first cavity 10 , and it is in communication with the exhaust pipe 404 . The fourth working state is that the adsorption part 406 is not in communication with the first cavity 10 and the exhaust pipe 404 . Specifically, at least two first air inlets 14 may be provided on the gas distribution plate 407 , and when the first air inlets 14 are aligned with the second air inlets 15 , the adsorption portion 406 communicates with the first cavity 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 16 , the adsorption portion 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 . Adjacent two adsorption parts 406 can be in a first circuit state in which they communicate with each other, or a second circuit state in which they do not communicate with each other. For example, when the adsorption part 406 is rotated so that the third exhaust port 18 and the fourth exhaust port 19 are aligned, the two adjacent adsorption parts are in the first circuit state. When the adsorption part 406 is rotated so that the third exhaust port 18 and the fourth exhaust port 19 are out of position, the two adjacent adsorption parts are in the second circuit state.

Preferably, two adjacent adsorption parts 406 can have different working states from each other. For example, as shown in FIG. 1 , in the direction from top to bottom, each suction part is named as a first suction part 406a, a second suction part 406b, a third suction part 406c, and a fourth suction part 406d in order. The first adsorption part 406a may be in the first working state, the second adsorption part 406b, the third adsorption part 406c and the fourth adsorption part 406d are all in the fourth working state, and the second adsorption part is in the second adsorption part. In the loop state, at this time, the mixed gas in the first cavity 10 can only enter the first adsorption part 406a, and the gas processed by the first adsorption part 406a can only move along the radial direction of the box 402 to enter the first stage 404a. For another example, when the first adsorption part 406a is in the second working state, both the second adsorption part 406b and the third adsorption part 406c are in the fourth working state, the fourth adsorption part 406d is in the third working state, and two adjacent ones When the adsorption parts are in the first circuit state, the mixed gas in the first cavity 10 first enters the first adsorption part 406 a along the radial direction of the box body 402 , and then enters the first adsorption part 406 a along the axial direction of the box body 402 in sequence. The second adsorption part 406b, the third adsorption part 406c and the fourth adsorption part 406d finally enter the exhaust pipe 404 through the first exhaust port 16 of the fourth adsorption part 406d. At this time, the moving path of the mixed gas in the adsorption part 406 increases, so that the filtering effect of VOCs can be increased. It can be understood that the length of the moving path of the mixed gas in the adsorption part can be increased or shortened by adjusting the working state of each adsorption part. For example, when the first suction part 406a is in the second working state, the second suction part 406b and the fourth suction part 406d are both at the fourth working state, the third suction part 406c is at the third working state, the first suction part 406a, the third suction part 406c are in the third working state. When the second adsorption part 406b and the third adsorption part 406c are in the first circuit state, and the third adsorption part 406c and the fourth adsorption part 406d are in the second circuit state, the mixed gas in the first cavity first enters the second circuit state. An adsorption part 406a then enters the second adsorption part 406b and the third adsorption part 406c in sequence along the radial direction of the box 402, and finally enters the exhaust pipe 404 through the first exhaust port 16 of the third adsorption part 406c. In the prior art, the moving path of the mixed gas in the adsorption part is a fixed value, and under different working conditions, the inlet pressure of the adsorber 4 will be different. When the inlet pressure is small, if the moving path is too large, the resistance at the tail end of the adsorber 4 will be too high, and then the inside of the adsorber 4 or its front end will hold air. When the pressure caused by the air holding is too large, the adsorber 4 will explode Security risks. Or when the inlet pressure is high, if the moving path is too small, the VOCs gas will not be completely removed at this time, resulting in substandard emission gas. In the present application, the working state of each adsorption part can be adjusted according to the inlet pressure, thereby changing the moving path of the mixed gas in the adsorption part, and finally a better VOCs removal effect can be achieved. At the same time, the present application can avoid the occurrence of suffocation inside the adsorber, thereby reducing the occurrence probability of potential safety hazards.

Preferably, as shown in FIG. 1 and FIG. 7 , the adsorption part 406 can be hollow, so that the adsorbent can be filled in the adsorption part 406 . Each adsorption part 406 is provided with a cooling pipe 20 inside. It can be understood that, in order to increase the contact area between the cooling pipe 20 and the adsorbent, the cooling pipe 20 may have a variety of different wiring methods, such as a spiral type and a bending type. Both the first end 20a and the second end 20b of the cooling pipe 20 can be fixed on the partition plate 408 . The first end 20a can communicate with the second segment 404b. The upstream of the second section 404b can be connected to the regeneration device 7, and then the high-temperature nitrogen gas generated by the regeneration device 7 can enter the cooling pipe 20 through the second section. Finally, the cooling pipe 20 can heat the adsorbent, so that the adsorbent can be desorbed and regenerated. The casing 402 is provided with a second exhaust passage 4b. The second exhaust passage 4b is located in the first cavity 10 . The second end 20b of the cooling pipe 20 communicates with the second exhaust passage 4b. Further, the cooled nitrogen gas in the cooling pipe 20 can be discharged from the adsorber 4 through the second exhaust passage 4b. Downstream of the second exhaust passage 4b may be connected to the heater 6 . Further, the nitrogen gas can be recycled in the second circulation channel 9 .

Claims (10)

1. The utility model provides a gaseous recovery processing device of clear jar process VOCs of portable, includes: -a filter (1), a fan (2), a first heat exchanger (3) and an adsorber (4) communicating with each other to constitute a first circulation channel (8), and-the adsorber (4), a second heat exchanger (5), a heater (6) and a regeneration device (7) communicating with each other to constitute a second circulation channel (9), characterized in that: the adsorber (4) is internally provided with a plurality of adsorption parts (406) filled with adsorbents, and the 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.

2. The device for recovering and treating VOCs gas in the tank cleaning process according to claim 1, which is characterized in that: the plurality of adsorption parts (406) are arranged adjacently along the axial direction of the adsorbers (4), each adsorption part (406) can rotate around the central axis of each adsorber (4) so that different adsorption parts (406) can have different working states, and a first circuit state communicated with each other or a second circuit state not communicated with each other is formed between every two adjacent adsorbers (4).

3. The device for recovering and treating VOCs gas in the tank cleaning process according to claim 2, is characterized in that: adsorber (4) include box (402), blast pipe (404), gas separation board (408) and a plurality of division board (408) at least, blast pipe (404) set up according to the mode of its axis coincidence with box (402) in box (402), gas separation board (408) cover is located outside blast pipe (404) in order to separate box (402) for first cavity (10) and second cavity (11), a plurality of division board (408) along the axial of box (402) set up in second cavity (11) in order to with second cavity (11) are separated for a plurality of subchambers (12), adsorber (4) set up according to the cover mode outside blast pipe (404) in subchambers (12).

4. The device for recovering and treating VOCs gas in the tank cleaning process according to claim 3, wherein: the gas separation plate (408) is provided with a plurality of first gas inlets (14), the adsorption part (406) is provided with a second gas inlet (15) and a first gas outlet (16), the exhaust pipe (404) is provided with a plurality of second gas outlets (17), and under the condition that the adsorption part (406) is rotated to enable the first gas inlets (14) to be aligned with the second gas inlets (15) and enable the first gas outlets (16) to be aligned with the second gas outlets (17), the adsorption part (406) is in a first working state, so that the first cavity (10) can be communicated with the exhaust pipe (404) through the adsorption part (406).

5. The device for recovering and treating VOCs gas in the tank cleaning process according to claim 4, is characterized in that: the suction portion (406) is in a second operating state in a case where the suction portion (406) is rotated so that the first intake port (14) is aligned with the second intake port (14) and the first exhaust port (16) is dislocated from the second exhaust port (17), or the suction portion (406) is in a third operating state in a case where the suction portion (406) is rotated so that the first intake port (14) is dislocated from the second intake port (14) and the first exhaust port (16) is aligned with the second exhaust port (17).

6. The device for recovering and treating VOCs gas in the tank cleaning process according to claim 5, is characterized in that: when the suction part (406) is rotated so that the first intake port (14) and the second intake port (14) are displaced and the first exhaust port (16) and the second exhaust port (17) are displaced, the suction part (406) is in a fourth operating state, and when the suction part (406) is in the fourth operating state, the first chamber (10) cannot communicate with the exhaust pipe (404) through the suction part (406).

7. The device for recovering and treating VOCs gas in the tank cleaning process according to claim 6, is characterized in that: the adsorption part (406) is further provided with at least one third exhaust port (18), the partition plate (408) is provided with at least one fourth exhaust port (19), and two adjacent adsorption parts (406) are in the first loop state when the adsorption part (406) is rotated such that the third exhaust port (18) is aligned with the fourth exhaust port (19), or two adjacent adsorption parts (406) are in the second loop state when the adsorption part (406) is rotated such that the third exhaust port (18) is ectopic with the fourth exhaust port (19).

8. The device for recovering and treating VOCs gas in the tank cleaning process according to claim 7, is characterized in that: when the adjacent first adsorption part (406a) and second adsorption part (406b) are in the first loop state, the first adsorption part (406a) is in the second working state, and the second adsorption part (406b) is in the third working state, the mixed gas with the VOCs gas in the first cavity (10) can move as follows: move in the radial direction of the adsorber (4) to enter the first adsorption part (406a), move in the axial direction of the adsorber (4) to enter the second adsorption part (406b), and move in the radial direction of the adsorption part (4) to enter the exhaust pipe (404).

9. The device for recovering and treating VOCs gas in the tank cleaning process according to claim 8, is characterized in that: in the case where different adsorption sections (406) 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 (4) can be increased or decreased.

10. The device for recovering and treating VOCs gas in the tank cleaning process according to claim 9, is characterized in that: each adsorption part (406) is internally provided with a cooling pipeline (20), and a first end (20a) and a second end (20b) of each cooling pipeline (20) can be arranged on the partition plate (408).

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