CN208553617U - A pull-type VOCs adsorption and desorption fixed bed device - Google Patents

Abstract

The utility model discloses a kind of drawing and pulling type VOCs adsorption/desorption fixed bed device, including fixed bed housing unit, it is provided with drawable bed drawer in the fixed bed housing unit, adsorbent is filled in the bed drawer, fixed bed housing unit two sides are provided with cover board.The pumping board of closing adsorbent exposed surface is provided on the bed drawer to extract pumping board out before the bed drawer is pushed into fixed bed housing unit.The utility model easy removal is readily transported, installs replacement adsorbent VOC free s leakage when normal operation with replacement, and can flexible design adsorption/desorption scheme.

Description

A pull-type VOCs adsorption and desorption fixed bed device

technical field

The utility model belongs to the technical field of waste gas treatment, in particular to a drawing-type VOCs adsorption and desorption fixed bed device.

Background technique

Adsorption is one of the main methods for treating waste gas containing VOCs, and its equipment is mainly fixed bed adsorption and runner adsorption concentration device. The fixed bed device is simple and reliable, with low price, wide range of waste gas concentration, and convenient and quick replacement of adsorbent. Due to the presence of rotating parts and tightness requirements, the runner adsorption and concentration device has a complex manufacturing process, high equipment cost, lower equipment reliability than fixed bed devices, higher requirements for adsorbent adsorption capacity, and the concentration of treated waste gas should not be too high. Therefore, the fixed bed is still the most widely used adsorption device. But at present, the fixed bed device also has the following series of problems:

(1) The time for replacing the adsorbent is too long, which affects the normal production of the enterprise;

(2) The concentration of on-site VOCs is high during disassembly and assembly, which endangers the health of operators;

(3) Sometimes in-situ regeneration cannot be achieved on site, and qualified manufacturers are required to provide desorption services.

In view of the above problems, it is necessary to develop a new type of adsorption fixed bed device to meet the efficient, safe and convenient production needs of enterprises.

Utility model content

Purpose of the invention: In view of the deficiencies of the prior art, the purpose of the present utility model is to provide a modular pull-type VOCs adsorption and desorption fixed bed device that is easy to disassemble and assemble on site, has less VOCs leakage when replacing the adsorbent, and has a flexible desorption mode. .

Technical scheme: In order to realize the above-mentioned purpose of the invention, the technical scheme adopted by the present utility model is as follows:

A pull-out type VOCs adsorption and desorption fixed bed device, comprising a fixed bed shell unit, a drawable bed drawer is arranged in the fixed bed shell unit, the bed drawer is filled with an adsorbent, and the Cover plates are arranged on both sides of the fixed bed shell unit.

Further, a sealing gasket is provided between the cover plate and the fixed bed housing unit, and the cover plate and the fixed bed housing unit are connected by bolt fasteners.

Further, the front end of the fixed bed shell unit is connected with a gas diffuser, and the rear end is connected with a gas collection cover, the gas diffuser is provided with an air inlet, and the gas collection cover is provided with an air outlet.

Further, a drawer for closing the exposed surface of the adsorbent is provided on the bed drawer, and the drawer is pulled out before the bed drawer is pushed into the fixed bed shell unit.

Further, the adsorbent is a square honeycomb adsorbent or a layered adsorbent, the channel direction of the honeycomb adsorbent is consistent with the flow direction of the exhaust gas, and the layered adsorbent is stacked horizontally or vertically.

Further, the height of the bed drawer is smaller than the maximum stacking height of the square honeycomb adsorbent or the maximum horizontal stacking height of the layered adsorbent.

Further, matching guide rails are provided on the inner side of the bottom of the fixed bed shell unit and the outer side of the bottom of the bed drawer.

Further, the shape of the guide rail is a rectangle, a trapezoid, a triangle or a circular arc.

Further, a plurality of pull rings are arranged on the bed drawer on one side of the cover plate.

Further, the fixed bed shell unit is provided with multiple layers arranged vertically, and each layer is provided with at least two fixed bed shell units arranged horizontally.

Beneficial effect: Compared with the prior art, the utility model has the following advantages:

The pull-out type VOCs adsorption and desorption fixed bed device in the utility model divides the fixed bed into several modules, the bed drawer in each fixed bed unit can be directly drawn out, and is equipped with auxiliary parts such as a drawer, a guide rail, and a pull ring. The device is easy to disassemble and assemble, no need to replace the adsorbent on site, short on-site operation time, convenient transportation, handling and storage, less fugitive emission of VOCs during transportation, handling and storage, and can be designed as a mobile adsorption device for intermittent treatment of waste gas or Handle emergencies such as sudden increase of VOCs in exhaust gas. The VOCs desorption of the device can be selected according to the actual situation by hot air desorption on site or by replacing the adsorbent and then sending it to a special adsorbent treatment factory for regeneration. The utility model has the advantages of simple and convenient disassembly, convenient transportation, installation and replacement, no VOCs leakage when the adsorbent is replaced during normal operation, and a flexible adsorption and desorption scheme can be designed.

Description of drawings

FIG. 1 is a schematic diagram of the three-dimensional structure of the device of the present invention after installation.

Figure 2 is a schematic diagram of the three-dimensional structure of the disassembly and assembly of the device of the present invention.

FIG. 3 is a schematic cross-sectional view of the device of the present invention in a side view direction after the installation is completed.

FIG. 4 is a schematic cross-sectional view from the front view direction after the installation of the device of the present invention is completed.

Figure 5 is a perspective view of the disassembly and assembly of the bed drawer.

Figure 6 is a schematic diagram of the bottom guide rail of the bed drawer.

Figure 7 is a schematic diagram of the structure of the bed drawer.

Figure 8 is a schematic diagram of a cover plate.

Detailed ways

The present utility model is further explained below in conjunction with the accompanying drawings.

As shown in Figure 1, the pull-type VOCs adsorption and desorption fixed bed device of the present application mainly includes 1, exhaust gas and hot air inlet 1, exhaust gas and hot air outlet 2, gas diffuser 3, gas collecting cover 4, fixed Bed shell unit 5, cover plate 6, bed drawer 7, adsorbent 8, drawer 9, pull ring 10, guide rail 11, fixed bed shell connector 12, bolt fastener 13, bed drawer fold 14, drawer The plate baffle 15, the drawing plate chute 16, the cover plate screw hole 17, the sealing gasket 18, a fixed bed shell unit 5, a bed drawer 7 and a cover plate 6 constitute a fixed bed unit, and the fixed bed shell unit 5 At least two fixed bed shell units 5 arranged horizontally are arranged on each layer, and the upper and lower layers of the fixed bed shell units 5 are connected by a fixed bed shell connecting piece 12 .

The fixed bed shell unit 5 and the bed drawer 7 are both cuboid structures. The front end of the fixed bed shell unit 5 is connected with the gas diffuser 3, and the rear end is connected with the gas collecting cover 4. The gas diffuser 3 is provided with an air inlet 1, An air outlet 2 is provided on the air collecting hood 4 . A drawable bed drawer 7 is arranged in the fixed bed housing unit 5, the bed drawer 7 is filled with adsorbent 8, and detachable cover plates are arranged on both sides of the fixed bed housing unit 5 along the gas flow direction 6.

A sealing gasket 18 is provided between the cover plate 6 and the fixed bed housing unit 5 , and the cover plate 6 and the fixed bed housing unit 5 are connected by bolt fasteners 13 . When the bed drawer 7 is placed in the fixed bed shell unit 5, the cover plate 6 is used to close it, and a sealing gasket 18 is provided between the two to ensure the air tightness of the fixed bed device. The inner wall of the fixed bed shell unit 5 can be considered according to the actual use situation. Whether to add thermal insulation lining to the inner wall.

On the side of the bed drawer 7 adjacent to the gas diffuser 3 and the gas collecting hood 4 are respectively provided with a drawer 9 for closing the exposed surface of the adsorbent 8, and the drawer 9 and the bed drawer 7 can pass through the folding chute and the card The method of buckle is connected, and the upper and lower sides of the drawer 9 are provided with drawer chute 16, and the bed drawer 7 is provided on the upper and lower sides adjacent to the gas diffuser 3 and the gas collecting hood 4. The drawer 9 is slid in or pulled out on the bed drawer 7 through the drawer sliding groove 16 and the bed drawer flange 14 , so as to seal and leak out the exposed surface of the adsorbent 8 in the bed drawer 7 . The end of the folding chute of the bed drawer is provided with a number of drawer plate blocking pieces 15 , which limit the position of the drawer plate 9 . When the bed drawer 7 is pulled out, the exposed surfaces of the two adsorbents 8 of the bed drawer 7 are closed by two special drawers 9 respectively. During storage and transportation, the bed drawer is in a closed state, preventing the Leakage of VOCs and adsorbents during the process; before the bed drawer 7 is pushed into the fixed bed housing unit 5, the drawer 9 is drawn out in advance to expose the adsorbent bed.

The adsorbent 8 is a square honeycomb adsorbent or a layered adsorbent, the channel direction of the honeycomb adsorbent is consistent with the flow direction of the exhaust gas, and the layered adsorbent is stacked horizontally or vertically. The height of the bed drawer 7 is smaller than the maximum stacking height of the square honeycomb adsorbent or the maximum horizontal stacking height of the layered adsorbent.

In order to facilitate pulling out and pushing in the bed drawer 7, one to four pull rings 10 are provided on the bed drawer 7 on one side of the cover plate 6, and the shapes of the pull rings 10 include but are not limited to arc and rectangle. In addition, 1 to 6 guide rails 11 are provided on the inner side of the bottom of the fixed bed shell unit 5 and the outer side of the bottom of the bed drawer 7 respectively. The shapes of the two guide rails 11 are complementary. When the outer side of the bottom of the bed drawer 7 is a protruding shape, when the inner side of the bottom of the fixed bed shell unit 5 is a protrusion shape, the outer side of the bottom of the bed drawer 7 is a groove shape; the shapes of the guide rails include but are not limited to rectangles, trapezoids, triangles and arcs. .

The VOCs mentioned in the utility model generally come from low-concentration organic waste gas produced by petrochemical, pharmaceutical, printing, polymer processing, automotive painting, fine chemical, chip manufacturing and other industries. The total VOCs concentration is 50-2000 mg/Nm ³ 1,000～200,000Nm ³ /h, the concentration of VOCs in the generated high-concentration exhaust gas is 5-50 times that of the untreated exhaust gas. In this embodiment, the cross-sections of the air inlet 1, the air outlet 2, the adsorbent 8 and the fixed bed shell unit 5 are all rectangular, and the length and width of the cross-sections of the air inlet 1 and the air outlet 2 in this embodiment are respectively The length and width of the section of the adsorbent fixed bed unit 5 are both 400 to 1500 mm; the length of the fixed bed shell unit 5 is 400 to 2000 mm. The flow rate of the exhaust gas through the fixed bed shell unit 5 is controlled within the range of 0.5-3m/s, the pressure drop of the bed is less than 2.5kPa, the adsorption temperature is 0-40°C, and the desorption temperature is 120-180°C.

The following examples are further detailed application descriptions of the present invention, and its parameters are only descriptions under a certain working condition, and do not limit the scope of application of the present invention.

Implementation Case 1: Adsorption and purification of organic waste gas in a pharmaceutical intermediate production enterprise

In this example, the waste gas generated by a pharmaceutical intermediate manufacturer comes from the exhaust gas when the reactor is discharged, the replacement gas before the reactor is fed, and the waste gas generated by the natural volatilization of organic solvents. Its physical parameters and compositions are shown in Table 1. Show.

Table 1 Physical properties and composition of waste gas from a pharmaceutical intermediate production enterprise

In this example, 6 fixed bed units are used, and one set of adsorption and desorption fixed bed devices is divided into three layers. The length and width of the air inlet and exhaust port of each unit are 350mm, and the cross section of the adsorbent fixed bed unit is 350mm. The length and width are both 700mm; the length of the adsorbent fixed bed unit is 1500mm. The adsorbent adopts honeycomb zeolite composite high-efficiency adsorbent with a porosity of 0.67. The operating parameters of the device and the composition of VOCs in the exhaust gas after treatment are shown in Table 2.

Table 2 The operating parameters of the device used in Example 1 and the composition of VOCs in the exhaust gas after treatment

Implementation case 2: Adsorption and purification of organic waste gas from paint spraying in an automobile manufacturing enterprise

In this example, the physical properties and composition of the exhaust gas produced by the coating process of an automobile manufacturing enterprise are shown in Table 3.

Table 3 The physical properties and composition of the exhaust gas from the coating process of an automobile manufacturing enterprise

In this example, 32 fixed bed units are used, which are divided into 4 groups with 4 layers in each group. The length and width of the cross section of the air inlet and exhaust port of each unit are 500 mm, and the length and width of the cross section of the adsorbent fixed bed unit are 500 mm. Both are 1000mm; the length of the adsorbent fixed bed unit is 2000mm. The adsorbent is a honeycomb activated carbon adsorbent in the shape of a cube, with a side length of 200 mm and a porosity of 0.65. The operating parameters of the device and the VOCs composition of the exhaust gas after treatment are shown in Table 4.

Table 4 is used for the operating parameters of the device of Example 2 and the composition of VOCs in the exhaust gas after treatment

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. These improvements and Retouching should also be regarded as the protection scope of the present invention.

Claims (10)

1. a kind of drawing and pulling type VOCs adsorption/desorption fixed bed device, it is characterised in that: including fixed bed housing unit (5), in institute It states in fixed bed housing unit (5) and is provided with drawable bed drawer (7), be filled with adsorbent (8) in the bed drawer (7), Fixed bed housing unit (5) two sides are provided with cover board (6).

2. drawing and pulling type VOCs adsorption/desorption fixed bed device according to claim 1, it is characterised in that: in the cover board (6) it is provided between fixed bed housing unit (5) seal washer (18), the cover board (6) and fixed bed housing unit (5) are logical Cross bolt fastener (13) connection.

3. drawing and pulling type VOCs adsorption/desorption fixed bed device according to claim 1, it is characterised in that: the fixed bed shell Body unit (5) front end is connect with gaseous diffuser (3), and rear end is connect with gas gathering mask (4), is arranged on the gaseous diffuser (3) Have air inlet (1), is provided with gas outlet (2) on the gas gathering mask (4).

4. drawing and pulling type VOCs adsorption/desorption fixed bed device according to claim 1, it is characterised in that: in the bed drawer (7) pumping board (9) of closing adsorbent (8) exposed surface is provided on, it, will before the bed drawer (7) is pushed into fixed bed housing unit (5) Pumping board (9) extraction.

5. drawing and pulling type VOCs adsorption/desorption fixed bed device according to claim 1, it is characterised in that: the adsorbent It (8) is rectangular honeycomb sorbent agent or layered adsorbent, the honeycomb sorbent agent channel direction and exhaust gas flow direction one It causes, layered adsorbent is horizontally or vertically stacked.

6. drawing and pulling type VOCs adsorption/desorption fixed bed device according to claim 5, it is characterised in that: the bed drawer (7) Height be less than the maximum of rectangular honeycomb sorbent agent and stack height or the maximum horizontal of layered adsorbent stacks height.

7. drawing and pulling type VOCs adsorption/desorption fixed bed device according to claim 1, it is characterised in that: in fixed bed shell Unit (5) bottom inside and bed drawer (7) bottom outside are provided with the guide rail (11) being used cooperatively.

8. drawing and pulling type VOCs adsorption/desorption fixed bed device according to claim 7, it is characterised in that: the guide rail (11) Shape be rectangle, trapezoidal, triangle or arc-shaped.

9. drawing and pulling type VOCs adsorption/desorption fixed bed device according to claim 1, it is characterised in that: the bed drawer (7) Upper be located at cover board (6) are provided with several pull rings (10) on one side.

10. drawing and pulling type VOCs adsorption/desorption fixed bed device according to claim 1, it is characterised in that: the fixed bed Housing unit (5) is provided with the multilayer being vertically arranged, and every layer is provided with the horizontally arranged fixed bed housing unit (5) of at least two.