Tail gas drying device based on sorbic acid production process

Abstract

The application relates to the technical field of atmospheric pollution prevention and treatment, and discloses a tail gas drying device based on a sorbic acid production process, which comprises two groups of alternately operated drying tanks, which are respectively used as adsorption tanks and desorption tanks, a drying inner cylinder is penetrated in the tanks, a sandwich cavity is enclosed in the cylinder through a first separation component and a second separation component, the interior is divided into three groups of adsorbent bed layers, a lifting assembly drives the second separation component to lift, the adsorbent swelling and shrinking states before and after desorption can be dynamically adjusted according to the lifting of the second separation component, the bed layer space, the cavity volume and the size of the air outlet hole, so that the problem that the adsorbent of the existing drying tank is directly filled and the flow resistance is large, and the desorption efficiency is poor, is solved, the application is designed in layers and the cavity is blocked, the air flow resistance is reduced, secondary adsorption of the lower layer is avoided, the desorption is dynamically adjusted and guaranteed, the desorption efficiency can be improved, the cycle can be shortened, the service life of the adsorbent can be prolonged, and the continuous and stable tail gas drying is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air pollution prevention and control, and particularly relates to a tail gas drying device based on a sorbic acid production process. BACKGROUND

[0002] In the production process of sorbic acid, the tail gas generated contains volatile organic compounds, a small amount of acidic components and other pollutants. If these substances are directly discharged into the atmosphere, they will not only damage the regional air quality, but also participate in photochemical reactions to form photochemical smog, or combine with water vapor to cause acid precipitation, causing clear harm to the atmospheric environment and the ecological system. The tail gas drying device is not just a process auxiliary device. Its core function is to treat the polluting tail gas: by drying to remove excess moisture in the tail gas, it can not only avoid the diffusion of pollutants carried by water, but also create necessary conditions for the efficient capture, adsorption or degradation of subsequent VOCs and other pollutants, directly reducing and even blocking the emission path of pollutants to the atmosphere, fully meeting the core logic of air pollution prevention and control, which belongs to the category of air pollution prevention and control.

[0003] For the above and existing related technologies, the inventors believe that in the existing drying tank structure, the adsorbent is usually placed in the tank by direct filling. When using dry hot gas flow for desorption, there is a problem of mismatch between gas flow circulation and desorption efficiency. In the early stage of desorption, the water content of the drying agent is high, and the drying agent is in the state of water absorption and expansion, which leads to narrow gaps and close accumulation between the drying agent particles in the tank. The dry hot gas flow needs to overcome a large flow resistance to penetrate the entire filling layer, which not only increases the energy consumption of gas flow transmission, but also may affect the local desorption effect due to uneven gas flow distribution. In the later stage of desorption, most of the water in the drying agent has been removed, and the particles shrink due to water loss, increasing the gap between the particles. At this time, the flow resistance of the dry hot gas flow is greatly reduced, and it is easy to quickly sweep along the gap between the particles from the surface, making it difficult to effectively penetrate into the internal pores of the drying agent particles. This results in the inability to fully contact and desorb the residual water in the particles, ultimately causing an imbalance in desorption efficiency between the early and late stages of desorption, unstable overall desorption effect and residual risk. SUMMARY

[0004] The technical problem to be solved by the present application is that in the existing drying tank, the adsorbent is directly filled, and in the desorption process, the water absorption and expansion of the drying agent cause a large flow resistance in the early stage, and the water loss and shrinkage of the drying agent make it easy to sweep the surface and difficult to remove the residual water in the internal particles in the later stage, causing an imbalance in desorption efficiency and affecting the desorption regeneration efficiency, and further affecting the subsequent adsorption. Therefore, we propose a tail gas drying device based on a sorbic acid production process.

[0005] To achieve the above objectives, this application adopts the following technical solution: a tail gas drying device based on the sorbic acid production process, comprising: an outer drying tank, wherein two sets of outer drying tanks are arranged side by side, one set of outer drying tanks being an adsorption tank and the other set being a desorption tank, the two sets of outer drying tanks operating alternately, an inner drying cylinder penetrating the interior of the outer drying tank, and an exhaust cavity formed by a partition between the inner drying cylinder and the outer drying tank, a first partition component and a second partition component installed inside the inner drying cylinder, the first partition component and the second partition component being arranged in parallel, and a sandwich cavity formed by a partition between the first partition component and the second partition component, three sets of sandwich cavities arranged at equal intervals about the interior of the inner drying cylinder, dividing the interior of the inner drying cylinder into three sets of adsorbent beds, and an exhaust hole is opened on the side of the inner drying cylinder, the sandwich cavity being connected to the exhaust cavity through the exhaust hole;

[0006] A lifting assembly is installed on the side of the first separating component. The lifting assembly is used to lower or raise the second separating component. When the second separating component lowers, the space of the adsorbent bed above the second separating component increases, and the volume of the interlayer cavity between the second separating component and the first separating component decreases, and the opening of the air outlet hole narrows. When the second separating component rises, it compresses the adsorbent bed above the second separating component, and the volume of the interlayer cavity between the second separating component and the first separating component increases, and the opening of the air outlet hole increases.

[0007] Preferably, an air outlet pipe is installed at the top of the outer drying tank and is connected to the outer drying tank; an air inlet pipe is installed at the bottom of the outer drying tank and is connected to the outer drying tank; the inner drying cylinder is fixedly connected to the outer drying tank; and a flow divider is fixedly connected to the top of the inner drying cylinder.

[0008] Preferably, a drying air pipe is installed on the side of the air outlet pipe, the drying air pipe is connected to the air outlet pipe, and the bottom end of the drying air pipe extends into the interior of the drying inner cylinder. An air jet valve is installed on the drying air pipe.

[0009] Preferably, the first partition component includes a first fixing plate, which is fixedly connected to the inner wall of the drying inner cylinder. The first fixing plate has a first vent in a ring array inside, and a mesh plate is fixedly connected inside the first vent.

[0010] Preferably, the top of the first fixing plate is fixedly connected to a first annular groove, the inside of the first annular groove is rotatably connected to a first blocking plate, the inside of the first blocking plate is provided with a first alignment port in an annular array, and the inside of the first alignment port is fixedly connected to a mesh plate.

[0011] Preferably, a rotating assembly is arranged at the middle position of the first fixed plate, and is used to drive the rotation of the first blocking plate; when the first alignment hole is aligned with the first air hole, the first separation assembly is in an open state; when the first alignment hole is misaligned with the first air hole, the first separation assembly is in a closed state.

[0012] Preferably, the second separation assembly comprises a second fixed plate which is slidingly connected to the inner wall of the drying inner cylinder; the inside of the second fixed plate is annularly arranged with second air holes; and the second air holes are staggered with the first air holes.

[0013] Preferably, the bottom of the second fixed plate is fixedly connected with a second annular groove; the inside of the second annular groove is rotatably connected with a second blocking plate; the inside of the second blocking plate is provided with a second alignment hole; the middle position of the second fixed plate is arranged with a rotating assembly which is used to drive the rotation of the second blocking plate; and the bottom of the second annular groove is fixedly connected with a sealing ring.

[0014] Preferably, the rotating assembly comprises a first motor; the output end of the first motor is fixedly connected with a gear; the rotating assembly further comprises an arc-shaped hole; the inside of the arc-shaped hole is provided with a sawtooth strip; the gear is inserted into the inside of the arc-shaped hole; and the gear is engaged with the sawtooth strip.

[0015] Preferably, the lifting assembly comprises a second motor; the second motor is arranged at the side of the first separation assembly; the output end of the second motor is fixedly connected with a lead screw; the outside of the lead screw is threadedly connected with a lifting nut; the lifting nut is fixedly connected with the side of the second separation assembly; the second motor further comprises a guide rod; the guide rod is fixedly connected to the side of the first separation assembly which is away from the second motor; the outside of the guide rod is slidingly connected with a guide sliding cylinder; and the guide sliding cylinder is fixedly connected to the side of the second separation assembly.

[0016] Technical effects and advantages of the present application:

[0017] The adsorbent of the application is arranged in layers and blocked with the interlayer cavity, the traditional whole filling is changed into multiple independent units, which greatly reduces the resistance of airflow penetration during desorption, avoids uneven airflow distribution and dead zone, ensures that each layer of adsorbent is in full contact with dry hot airflow, and enables the moisture desorbed from the upper layer to be quickly discharged through the cavity, completely blocking the secondary adsorption of the unsaturated adsorbent in the lower layer, significantly improving the desorption efficiency and shortening the regeneration cycle; at the same time, the dynamic cooperation of the second separation assembly and the first separation assembly can adjust the bed space, the interlayer cavity and the size of the air outlet according to the expansion or contraction state of the adsorbent before and after desorption, relieve the resistance surge caused by particle expansion in the early stage, reduce the power consumption of the fan, fill the large gap caused by particle shrinkage in the later stage, prevent airflow short circuit type surface sweeping, ensure that the residual moisture in the adsorbent is fully desorbed, reduce adsorbent extrusion wear and tear, and prolong its service life. BRIEF DESCRIPTION OF DRAWINGS

[0018] The disclosure of the application will be explained with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the application. In the drawings, the same reference numerals are used to refer to the same parts:

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the whole application;

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the inside of the drying outer tank of the application;

[0021] Figure 3 It is a schematic diagram of the cross-sectional structure of the exhaust cavity part of the application;

[0022] Figure 4 It is a schematic diagram of the cross-sectional structure of the first separation assembly and the second separation assembly part of the application;

[0023] Figure 5 It is an exploded structural schematic diagram of the first fixed plate and the second fixed plate part of the application;

[0024] Figure 6 It is an exploded structural schematic diagram of the second separation assembly part of the application;

[0025] Figure 7 It is an exploded structural schematic diagram of the first separation assembly part of the application;

[0026] Figure 8 It is a schematic diagram of the three-dimensional structure of the rotating assembly part of the application.

[0027] Legend: 1, dry outer tank; 2, air injection valve; 3, dry inner cylinder; 4, exhaust cavity; 5, first separation assembly; 6, second separation assembly; 7, rotating assembly; 8, lifting assembly; 9, air inlet pipe; 10, air outlet pipe; 11, drying gas pipe; 12, flow distribution plate; 13, air outlet hole; 501, first fixed plate; 502, first air vent; 503, first annular groove; 504, first blocking plate; 505, first alignment port; 601, second fixed plate; 602, second air vent; 603, second annular groove; 604, second blocking plate; 605, second alignment port; 606, sealing ring; 701, arc-shaped port; 702, sawtooth strip; 703, gear; 704, first motor; 801, second motor; 802, lead screw; 803, lifting nut; 804, guide rod; 805, guide sliding cylinder. DETAILED DESCRIPTION

[0028] It is easy to understand that, according to the technical solution of the present application, those skilled in the art can propose a plurality of structure modes and implementation modes that can be replaced with each other without changing the essential spirit of the present application. Therefore, the following detailed description and the accompanying drawings are only exemplary descriptions of the technical solution of the present application, and should not be considered as the whole or as a limitation or restriction on the technical solution of the present application.

[0029] REFERENCE Figure 1 , Figure 2 AND Figure 3 As shown in the drawings, the present application provides a technical solution: a tail gas drying device based on a sorbic acid production process, comprising: a dry outer tank 1, the dry outer tank 1 is provided with two groups side by side, one of which is an adsorption tank, the other is a desorption tank, the two groups of dry outer tanks 1 operate alternately, the top of the dry outer tank 1 is provided with an air outlet pipe 10, and the air outlet pipe 10 is in communication with the dry outer tank 1, the bottom of the dry outer tank 1 is provided with an air inlet pipe 9, and the air inlet pipe 9 is in communication with the dry outer tank 1, the dry inner cylinder 3 is fixedly connected between the dry outer tank 1, and the top end of the dry inner cylinder 3 is fixedly connected with a flow distribution plate 12, the side of the air outlet pipe 10 is provided with a drying gas pipe 11, the drying gas pipe 11 is in communication with the air outlet pipe 10, and the bottom end of the drying gas pipe 11 extends into the inside of the dry inner cylinder 3, and the drying gas pipe 11 is provided with an air injection valve 2.

[0030] The existing drying tank generally adopts a structure design of directly filling the adsorbent, when using the drying hot gas flow to perform the desorption operation, the gas flow needs to be forced to penetrate through the entire adsorbent filling layer in the tank to complete the discharge, and the natural accumulation characteristics of the adsorbent particles, especially in the early stage of desorption, the adsorbent is in an expanded state due to the water absorption in the early stage, the gap between the particles is small, which will cause the gas flow to face significant resistance in the penetration process. Too large resistance is easy to cause uneven distribution of gas flow in the adsorbent layer, part of the area gas flow speed is too slow or even forms a dead zone, which causes the adsorbent in this area to be unable to fully contact with the drying hot gas flow, and the desorption is not complete, and local moisture remains; and in order to ensure the efficiency of the adsorption and drying of the adsorbent, the adsorbent in the drying tank generally does not need to be completely saturated, and the function will be replaced, and the desorption is performed, that is, during the desorption, the adsorbent material still has a certain adsorption capacity, when the upper layer of adsorbent is desorbed under the action of the drying hot gas flow, the water released by the upper layer of adsorbent moves downward with the gas flow, and will contact with the lower layer of unsaturated adsorbent which still has adsorption capacity, because the adsorption active sites of the lower layer of adsorbent are not completely occupied, the water in the gas flow will be captured and fixed again, which increases the desorption pressure of the lower layer of adsorbent and affects the desorption efficiency. In order to solve the problems of large gas flow resistance, easy to affect the uniformity of gas flow distribution and re-adsorption of lower layer of adsorbent affecting the desorption efficiency during desorption, the present application is improved as follows:

[0031] Please refer to Figure 2 and Figure 3 As shown in the figure, the inside of the drying outer tank 1 penetrates the drying inner cylinder 3, and the drying inner cylinder 3 and the drying outer tank 1 are surrounded to form an exhaust cavity 4, the inside of the drying inner cylinder 3 is provided with a first separation assembly 5 and a second separation assembly 6, the first separation assembly 5 and the second separation assembly 6 are arranged in parallel, and the first separation assembly 5 and the second separation assembly 6 are surrounded to form a sandwich cavity, the sandwich cavity is arranged with three groups of adsorbent bed layers about the inside of the drying inner cylinder 3, the side of the drying inner cylinder 3 is provided with a gas outlet hole 13, and the sandwich cavity is connected with the exhaust cavity 4 through the gas outlet hole 13;

[0032] The present application divides the adsorbent in the tank into multiple layers, which are separated by the sandwich cavity, and the adsorbent in the tank is blown and desorbed from top to bottom during the use of the drying gas flow, the moisture blown by each layer enters the sandwich cavity and is discharged through the gas outlet hole 13 and the exhaust cavity 4, and the adsorbent is changed from the traditional whole filling to multiple independent units, the thickness of each layer of adsorbent is greatly reduced, the drying gas flow does not need to overcome the great resistance of the whole filling layer, and only needs to act on a single layer to complete the desorption, and the resistance is significantly reduced; at the same time, the single layer thin structure is more easy to realize the uniform coverage of the gas flow, and avoids the situation of gas flow dead zone or uneven flow rate in the traditional whole layer, which ensures that each layer of adsorbent fully contacts with the hot gas flow, and effectively avoids the situation of incomplete local desorption.

[0033] At the same time, since each layer of adsorbent is separated by the interlayer cavity formed by the first separation component 5 and the second separation component 6, when the upper layer of adsorbent is desorbed of moisture under purging, the moisture directly enters the corresponding interlayer cavity and is quickly discharged out of the tank, and does not diffuse downward along the airflow to the lower layer. The lower layer of unsaturated adsorbent is only in contact with the dry airflow when it is desorbed by purging, and does not meet the desorbed moisture of the upper layer, thereby blocking the secondary adsorption and desorption of moisture of the lower layer of adsorbent. The desorption period is greatly shortened, and the regeneration efficiency of the drying tank is improved.

[0034] In the early desorption stage, the adsorbent adsorbs a large amount of moisture in the early drying stage of the tail gas, and the internal porous structure is filled with a large number of water molecules. These water molecules will cause the adsorbent particles to swell through hydration or physical filling effect, resulting in an increase in the volume of the particles. The adsorbent in the existing drying tank is in a fixed filling state, and when the volume of the particles increases, the particles will be squeezed, the original gap between the particles will be compressed, and the overall state will be relatively dense. In the late desorption stage, as the drying hot gas continues to act, the water in the adsorbent is continuously heated and vaporized and discharged with the airflow, the water molecules in the porous structure gradually flow out, and the adsorbent particles lose the support of water and gradually recover to the contracted state before absorbing water. The volume of the particles decreases, the squeezing effect between the particles decreases, and the compressed gap is released, so the gap between the particles will obviously increase.

[0035] In the early desorption stage, the adsorbent particles are in a dense state and the gap is small, which significantly increases the flow resistance of the drying hot gas and increases the energy consumption. In the late desorption stage, the gap between the adsorbent particles increases, the airflow resistance decreases significantly, but the airflow is easily swept along the gap from the surface of the adsorbent particles, and it is difficult to penetrate into the internal particles to contact the residual water. In order to solve this technical problem, the following improvements are made in the present application:

[0036] Please refer to Figure 2 、 Figure 4 As shown in the drawings, the first separation component 5 is provided with a lifting assembly 8 on the side, and the lifting assembly 8 is used to lower or raise the second separation component 6. When the second separation component 6 is lowered, the space of the adsorbent bed layer above the second separation component 6 increases, the volume of the interlayer cavity between the second separation component 6 and the first separation component 5 decreases, and the opening of the gas outlet hole 13 decreases. When the second separation component 6 is raised, the adsorbent bed layer above the second separation component 6 is squeezed, the volume of the interlayer cavity between the second separation component 6 and the first separation component 5 increases, and the opening of the gas outlet hole 13 increases.

[0037] The second separation assembly 6 can be lifted, and cooperates with the fixed first separation assembly 5, so that the size of the adsorbent bed space, the interlayer cavity and the air outlet can be adapted according to the state of the adsorbent in different stages of desorption; in the early stage of desorption, the upper partition plate is lowered to actively expand the adsorbent bed space according to the water absorption and expansion characteristics of the adsorbent, so as to avoid the further reduction of the gap caused by the excessive extrusion of the expanded particles due to the limited space, thereby effectively relieving the resistance when the airflow penetrates, reducing the power consumption of the fan, and at the same time, the reduced interlayer cavity and air outlet can slow down the airflow velocity, prolong the contact time of the dry hot airflow and the adsorbent, avoid the insufficient desorption caused by the rapid airflow through the layer, and improve the desorption uniformity; in the later stage of desorption, the second separation assembly 6 is lifted to slightly extrude the adsorbent bed above it in the case of the shrinkage of the adsorbent particles, so as to fill the large gap caused by the shrinkage of the particles, prevent the airflow from quickly sweeping along the gap, force the airflow to penetrate into the particles to contact the residual moisture, and improve the desorption completeness; the dynamically adjusted bed space facilitates stable airflow resistance, ensures efficient moisture discharge, guarantees the continuous and efficient desorption process, and provides reliable support for the continuity of the subsequent tail gas drying process.

[0038] Referring to Figure 7 As shown in the drawings, the first separation assembly 5 comprises a first fixed plate 501, and the first fixed plate 501 is fixedly connected to the inner wall of the drying inner cylinder 3. The first fixed plate 501 is internally provided with a first air inlet 502 in a ring array, and the inside of the first air inlet 502 is fixedly connected with a mesh plate. The top of the first fixed plate 501 is fixedly connected with a first annular groove 503, and the inside of the first annular groove 503 is rotatably connected with a first blocking plate 504. The inside of the first blocking plate 504 is provided with a first alignment opening 505 in a ring array, and the inside of the first alignment opening 505 is fixedly connected with a mesh plate. A rotating assembly 7 is installed at the middle position of the first fixed plate 501, and the rotating assembly 7 is used to drive the first blocking plate 504 to rotate. When the first alignment opening 505 is aligned with the first air inlet 502, the first separation assembly 5 is in an open state. When the first alignment opening 505 is misaligned with the first air inlet 502, the first separation assembly 5 is in a closed state.

[0039] Referring to Figure 5 and Figure 6As shown, the second separation assembly 6 comprises a second fixed plate 601 which is slidingly connected to the inner wall of the drying inner cylinder 3, the inside of the second fixed plate 601 is provided with a second air vent 602 in a ring array, and the second air vent 602 is staggered with the first air vent 502, the bottom of the second fixed plate 601 is fixedly connected with a second ring groove 603, and the inside of the second ring groove 603 is rotatably connected with a second blocking plate 604, the inside of the second blocking plate 604 is provided with a second alignment opening 605, and the middle position of the second fixed plate 601 is provided with a rotating assembly 7 for driving the rotation of the second blocking plate 604, and the bottom of the second ring groove 603 is fixedly connected with a blocking ring 606.

[0040] As shown in Figure 8 As shown, the rotating assembly 7 comprises a first motor 704, and the output end of the first motor 704 is fixedly connected with a gear 703, the rotating assembly 7 further comprises an arc-shaped opening 701 which is provided in the inside of the first blocking plate 504 and the second blocking plate 604, and the inside of the arc-shaped opening 701 is provided with a sawtooth strip 702, the gear 703 is inserted into the inside of the arc-shaped opening 701, and the gear 703 is engaged with the sawtooth strip 702, when the first motor 704 rotates with the gear 703, since the gear 703 is engaged with the sawtooth strip 702, the corresponding first blocking plate 504 or second blocking plate 604 can be rotated.

[0041] As shown in Figure 4 With Figure 7 As shown, the lifting assembly 8 comprises a second motor 801 which is installed on the side of the first separation assembly 5, the output end of the second motor 801 is fixedly connected with a lead screw 802, the outside of the lead screw 802 is threadedly connected with a lifting nut 803, and the lifting nut 803 is fixedly connected with the side of the second separation assembly 6, the second motor 801 further comprises a guide rod 804 which is fixedly connected to the side of the first separation assembly 5 away from the second motor 801, the outside of the guide rod 804 is slidingly connected with a guide sliding cylinder 805, and the guide sliding cylinder 805 is fixedly connected with the side of the second separation assembly 6, when the output end of the second motor 801 rotates with the lead screw 802, the second separation assembly 6 can be lifted or lowered, the guide sliding cylinder 805 slides up and down along the guide rod 804, and the lifting movement of the second separation assembly 6 is limited.

[0042] Working principle: sorbic acid tail gas is transported to the inside of the drying outer tank 1 through the gas inlet pipe 9, the first separation component 5 and the second separation component 6 in the drying tank are all in the open state, and the gas outlet holes 13 are all in the closed state, the sorbic acid tail gas passes from the inside of the drying inner cylinder 3 from bottom to top, the adsorbent filled in the inside of the drying inner cylinder 3 adsorbs the water carried in the tail gas, and the gas after drying in the drying tank is discharged outward from the gas outlet pipe 10, at this time, the other drying outer tank 1 plays a function of desorption, the gas discharged outward from the gas outlet pipe 10 in the drying tank after drying, part of which is introduced into the inside of the drying gas pipe 11, after heating, the dry hot gas flow is introduced into the desorption tank through the drying gas pipe 11 and the air injection valve 2, the first air injection valve 2, that is, the air injection valve 2 above the flow distribution plate 12, is opened first, the dry hot gas flow is divided into several small gas flows downward by the flow distribution effect of the flow distribution plate 12, and enters the first layer of adsorbent bed, at this time, the first separation component 5 is in the closed state, and the second separation component 6 is in the open state, the gas flow carrying water passing through the first layer of adsorbent bed enters the first layer of interlayer cavity through the first separation component 5, and is discharged outward through the gas outlet hole 13;

[0043] When the adsorbent in the first layer of adsorbent bed completes desorption, the first layer of second separation component 6 is closed, the first separation component 5 is opened, and at the same time, the second group of air injection valves 2, that is, the air injection valves 2 in the interlayer cavity between the first layer of first separation component 5 and the second separation component 6, start to blow air, the dry hot gas flow enters the second layer of adsorbent bed through the first separation component 5, and carries the moisture from the interlayer cavity below and the air injection valve 2 to the exhaust cavity 4, and the moisture adsorbed in the adsorbent in the drying inner cylinder 3 is desorbed layer by layer.

[0044] The technical scope of the present application is not limited to the content in the above description, and those skilled in the art can make various modifications and changes to the above embodiments without departing from the technical idea of the present application, and these modifications and changes should all belong to the protection scope of the present application.

Claims

1. A tail gas drying device for sorbic acid production, characterized in that, The device includes an outer drying tank, with two sets of outer drying tanks arranged side by side. One set of outer drying tanks is an adsorption tank, and the other set is a desorption tank. The two sets of outer drying tanks operate alternately. An inner drying cylinder runs through the interior of each outer drying tank. The inner drying cylinder is fixedly connected to the outer drying tank, and a baffle between the inner drying cylinder and the outer drying tank forms an exhaust cavity. A first partition component and a second partition component are installed inside the inner drying cylinder. The first and second partition components are arranged in parallel, and a baffle between the first and second partition components forms a sandwich cavity. Three sets of sandwich cavities are arranged at equal intervals around the interior of the inner drying cylinder, dividing the interior of the inner drying cylinder into three sets of adsorbent beds. An exhaust hole is opened on the side of the inner drying cylinder, and the sandwich cavity is connected to the exhaust cavity through the exhaust hole. A lifting assembly is installed on the side of the first separating component. The lifting assembly is used to lower or raise the second separating component. When the second separating component lowers, the space of the adsorbent bed above the second separating component increases, and the volume of the interlayer cavity between the second separating component and the first separating component decreases, and the opening of the air outlet hole narrows. When the second separating component rises, it compresses the adsorbent bed above the second separating component, and the volume of the interlayer cavity between the second separating component and the first separating component increases, and the opening of the air outlet hole increases.

2. The tail gas drying device based on the sorbic acid production process according to claim 1, characterized in that: An air outlet pipe is installed on the top of the outer drying tank and is connected to the outer drying tank. An air inlet pipe is installed at the bottom of the outer drying tank and is connected to the outer drying tank. A flow divider plate is fixedly connected to the top of the inner drying cylinder.

3. The tail gas drying device based on the sorbic acid production process according to claim 2, characterized in that: A drying air pipe is installed on the side of the air outlet pipe. The drying air pipe is connected to the air outlet pipe, and the bottom end of the drying air pipe extends into the interior of the drying inner cylinder. An air jet valve is installed on the drying air pipe.

4. The tail gas drying device based on the sorbic acid production process according to claim 1, characterized in that: The first partition component includes a first fixing plate, which is fixedly connected to the inner wall of the drying inner cylinder. The first fixing plate has a first vent in a ring array inside, and a mesh plate is fixedly connected inside the first vent.

5. The tail gas drying device based on the sorbic acid production process according to claim 4, characterized in that: The top of the first fixed plate is fixedly connected to a first annular groove, and a first blocking plate is rotatably connected inside the first annular groove. The first blocking plate has a first alignment port arranged in a ring array inside, and a mesh plate is fixedly connected inside the first alignment port.

6. The tail gas drying device based on the sorbic acid production process according to claim 5, characterized in that: A rotating assembly is installed at the middle position of the first fixed plate. The rotating assembly is used to drive the first blocking plate to rotate. When the first alignment port is aligned with the first vent, the first partition assembly is in the open state. When the first alignment port is misaligned with the first vent, the first partition assembly is in the closed state.

7. The tail gas drying device based on the sorbic acid production process according to claim 1, characterized in that: The second partition component includes a second fixing plate, which is slidably connected to the inner wall of the drying inner cylinder. The interior of the second fixing plate is provided with a second air vent in a ring array, and the second air vent and the first air vent are staggered.

8. The tail gas drying device based on the sorbic acid production process according to claim 7, characterized in that: The bottom of the second fixed plate is fixedly connected to a second annular groove, and a second blocking plate is rotatably connected inside the second annular groove. The second blocking plate has a second alignment opening inside. A rotating assembly is installed in the middle of the second fixed plate to drive the rotation of the second blocking plate. A sealing ring is fixedly connected to the bottom of the second annular groove.

9. The tail gas drying device in the sorbic acid production process according to claim 6 or 8, characterized in that: The rotating assembly includes a first motor, and a gear is fixedly connected to the output end of the first motor. The rotating assembly also includes an arc-shaped opening, inside which a serrated rack is provided. The gear is inserted into the inside of the arc-shaped opening, and the gear meshes with the serrated rack.

10. The tail gas drying device based on the sorbic acid production process according to claim 1, characterized in that: The lifting assembly includes a second motor, which is mounted on the side of the first partition assembly. The output end of the second motor is fixedly connected to a lead screw, and the lead screw is threaded with a lifting nut, which is fixedly connected to the side of the second partition assembly. The second motor also includes a guide rod, which is fixedly connected to the side of the first partition assembly away from the second motor. The guide rod is slidably connected to a guide cylinder, which is fixedly connected to the side of the second partition assembly.

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