Tail gas treatment device for decabromodiphenyl ethane production

Abstract

The utility model discloses a tail gas treatment device for decabromodiphenyl ethane production, which comprises a condensing box, a spraying box and a filtering box which are arranged on the same vertical line from bottom to top, a gas inlet pipe is arranged on the side edge of the condensing box, a condensate discharge pipe is arranged at the bottom of the condensing box, a condensing coil is arranged in the condensing box, and a water inlet pipe is arranged at the bottom of the spraying box. The spraying box is communicated with the condensing box through a top gathering plate with holes, an annular pipe is installed in the spraying box, a concentric-square-shaped flow guide groove is formed in the periphery of the spraying box, the spraying box is communicated with the filtering box through a separation net, a drawer box is installed in the filtering box in a sliding mode, and the drawer box is filled with an activated carbon layer. When tail gas passes through the condensing box, one part of the tail gas is condensed into liquid to be discharged, the other part of the tail gas is neutralized and discharged by alkali liquor through the spraying box, the rest of the tail gas is discharged after being adsorbed and filtered by an activated carbon layer through the filtering box, a plurality of treatment towers do not need to be arranged, and the whole device is small in size and convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of decabromodiphenyl ethane production technology, and in particular to a tail gas treatment device for decabromodiphenyl ethane production. Background Technology

[0002] Decabromodiphenyl ethane, belonging to the aryl brominated flame retardant class, possesses good flame retardancy, thermal stability, and UV resistance. Currently, the bromine method is mainly used to prepare decabromodiphenyl ethane. Bromine and diphenyl ethane react with a catalyst to produce decabromodiphenyl ethane and hydrogen bromide. Hydrogen bromide and uncondensed bromine gas are extracted by a micro-negative pressure system and absorbed by water. However, a small amount of gas escapes. This gas contains small amounts of bromine vapor, hydrogen bromide gas, and small amounts of gaseous organic components, polluting the environment and affecting the health of nearby workers. Therefore, exhaust gas treatment equipment is required for its processing.

[0003] Existing decabromodiphenyl ethane tail gas treatment devices require multiple adsorption towers, such as condensation towers, alkali neutralization towers, and activated carbon absorption towers, to treat the tail gas. This not only takes up a large area and is inconvenient to use, but also makes it difficult to replace the adsorption filters in the absorption towers.

[0004] Therefore, we propose a tail gas treatment device for the production of decabromodiphenyl ethane to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a tail gas treatment device for the production of decabromodiphenyl ethane, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A tail gas treatment device for the production of decabromodiphenyl ethane includes a condenser, a spray box, and a filter box arranged vertically from bottom to top. The condenser has an inlet pipe on its side and a condensate discharge pipe at its bottom. A condenser coil is installed inside the condenser, with pipes at both ends of the coil extending through the side wall of the condenser. The spray box is connected to the condenser via a perforated dome plate. An annular pipe is installed inside the spray box, with several nozzles evenly distributed on its lower surface. One side of the annular pipe is connected to an alkali supply pipe extending through the side wall of the spray box. A U-shaped guide channel is arranged around the periphery of the spray box, and this channel is connected to the interior of the spray box via a through-slot. An alkali discharge pipe is located around the periphery of the U-shaped guide channel. The spray box and the filter box are connected via a mesh screen, and the filter box has an exhaust pipe. A drawer box is slidably installed inside the filter box, and the drawer box is filled with an activated carbon layer.

[0008] In a further embodiment, the bottom of the condenser box adopts a bucket-shaped structure that is wider at the top and narrower at the bottom, and the condensate drain pipe is installed at the lowest point of the bucket-shaped structure.

[0009] In a further embodiment, the top plate adopts a tapered structure that is narrower at the top and wider at the bottom, and a conical cover is installed on the through hole of the top plate by a support rod.

[0010] In a further embodiment, an overflow prevention box is provided below the alkali discharge pipe, and an overflow hole is provided on the side wall of the overflow prevention box, and the horizontal plane where the overflow hole is located is higher than the horizontal plane where the outlet of the alkali discharge pipe is located.

[0011] In a further embodiment, the overflow box and the condensate box are connected by a hook.

[0012] In a further embodiment, the front of the drawer box is fitted with a panel for fastening to the front port of the filter box, and a sealing strip is provided around the panel.

[0013] In a further embodiment, a plurality of magnet blocks are embedded in the edge of the front port of the filter box, and the magnet blocks are magnetically connected to the panel.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention arranges the condenser, spray box, and filter box in a vertical line from bottom to top. When the exhaust gas passes through the condenser, part of the exhaust gas is condensed into liquid and discharged, while another part is neutralized by alkaline solution and discharged after passing through the spray box. The remaining exhaust gas is filtered by the activated carbon layer in the filter box before being discharged. This eliminates the need for multiple treatment towers, resulting in a small overall size, minimal footprint, and ease of use. Furthermore, the drawer box is relatively easy to open compared to the filter box, facilitating the replacement of the internal activated carbon layer and ensuring excellent filtration performance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the left front view structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the right front view structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of the condenser box and spray box of this utility model;

[0019] Figure 4 This is a schematic diagram of the internal structure of the drawer box of this utility model;

[0020] Figure 5 This is a schematic diagram of the internal structure of the filter box of this utility model.

[0021] In the diagram: 1. Condensation box; 11. Inlet pipe; 12. Condensate drain pipe; 13. Top plate; 131. Conical cover; 132. Support rod; 2. Spray box; 21. Through groove; 22. U-shaped guide groove; 23. Alkali drain pipe; 3. Filter box; 31. Exhaust pipe; 32. Partition mesh; 33. Magnetic block; 4. Condensation coil; 5. Circular pipe; 51. Nozzle; 6. Alkali supply pipe; 7. Drawer box; 71. Panel; 72. Sealing strip; 8. Activated carbon layer; 9. Overflow box; 91. Overflow hole; 92. Hook. Detailed Implementation

[0022] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-3A tail gas treatment device for the production of decabromodiphenyl ethane includes a condenser box 1, a spray box 2, and a filter box 3 arranged vertically from bottom to top, forming a complete machine body. The condenser box 1 has an air inlet pipe 11 on its side, which is used to connect to the tail gas discharge pipe of the decabromodiphenyl ethane production reactor, so that the tail gas is discharged into the condenser box 1. The bottom of the condenser box 1 has a condensate discharge pipe 12. The bottom of the condenser box 1 adopts a funnel-shaped structure that is wider at the top and narrower at the bottom, and the condensate discharge pipe 12 is installed at the lowest point of the funnel-shaped structure to facilitate the discharge of the condensed liquid. The condensate discharge pipe 12 is normally closed to prevent the tail gas from overflowing from the condensate discharge pipe 12 during tail gas filtration. The condenser box 1 is equipped with a condenser coil 4. The condenser coil 4 has a spiral structure, and the pipes at both ends of the condenser coil 4 extend through the side wall of the condenser box 1. The pipes at both ends of the condenser coil 4 are connected to a coolant supply device, so that the coolant flows inside the condenser coil 4. When the tail gas comes into contact with the condenser coil 4, it is condensed into liquid.

[0026] Please see Figure 1-3 The top of the condenser 1 is equipped with a perforated top plate 13. The spray box 2 is connected to the condenser 1 through the perforated top plate 13, so that the uncondensed exhaust gas can enter the spray box 2. An annular pipe 5 is installed inside the spray box 2. Several nozzles 51 are evenly arranged on the lower surface of the annular pipe 5. An alkaline solution supply pipe 6 is connected to one side of the annular pipe 5, which extends out of the side wall of the spray box 2. The alkaline solution supply pipe 6 is connected to an alkaline solution supply device to deliver alkaline solution into the annular pipe 5, which is then sprayed out by the nozzles 51 to neutralize the exhaust gas. The top plate 13 is narrow at the top. The conical structure with a wide bottom allows droplets contacting the top of the top plate 13 to flow down to the edge of the top plate 13, while the falling alkali solution can also flow down to the edge of the top plate 13. To prevent the alkali solution from falling into the condenser box 1, a conical cover 131 is installed on the through hole of the top plate 13 via a support rod 132. The conical cover 131 covers the through hole of the top plate 13, and also allows the exhaust gas rising from the through hole of the top plate 13 to disperse from the edge under the obstruction of the conical cover 131, preventing it from concentrating together, thereby enhancing its neutralization effect with the alkali solution.

[0027] Please see Figure 1-3 To facilitate the collection of the neutralized alkali solution, a U-shaped guide channel 22 is provided around the perimeter of the spray box 2, and a through channel 21 is provided on the side wall of the spray box 2 to connect with the inside of the U-shaped guide channel 22, so that the alkali solution can flow into the U-shaped guide channel 22 along the through channel 21. An alkali solution discharge pipe 23 is provided around the perimeter of the U-shaped guide channel 22, and the U-shaped guide channel 22 is inclined towards the alkali solution discharge pipe 23, so that the alkali solution is concentrated and discharged through the alkali solution discharge pipe 23.

[0028] For further details, please refer to Figure 2-3Considering that when the alkali discharge pipe 23 is open, there is a possibility that the exhaust gas may overflow from the alkali discharge pipe 23, an overflow box 9 is provided below the alkali discharge pipe 23. The alkali discharge pipe 23 is inserted into the overflow box 9. An overflow hole 91 is provided on the side wall of the overflow box 9, and the horizontal plane of the overflow hole 91 is higher than the horizontal plane of the outlet of the alkali discharge pipe 23, so that the outlet of the alkali discharge pipe 23 is below the liquid surface in the overflow box 9, thereby reducing the possibility of exhaust gas overflow. In addition, in order to facilitate the handling of the liquid in the overflow box 9, a hanging hole is provided on the overflow box 9, and a hook 92 matching the hanging hole is installed on the side wall of the condenser box 1, so that the overflow box 9 can be hung on the hook 92 for easy installation and removal.

[0029] Please see Figure 1-3 The spray box 2 and the filter box 3 are connected by a partition 32, so that the unneutralized exhaust gas enters the filter box 3 through the partition 32. The filter box 3 is equipped with an exhaust pipe 31. A drawer box 7 is slidably installed inside the filter box 3. The bottom of the drawer box 7 is hollow and the drawer box 7 is filled with an activated carbon layer 8, so that the exhaust gas is filtered by the activated carbon layer 8 and discharged from the exhaust pipe 31. The drawer box 7 can be opened relative to the filter box 3, so as to facilitate the replacement of the activated carbon layer 8.

[0030] For further details, please refer to Figure 4-5 To improve the sealing of the drawer box 7 and reduce exhaust gas leakage, a panel 71 is installed on the front of the drawer box 7. The panel 71 is used to fasten to the front port of the filter box 3, and a sealing strip 72 is provided around the panel 71 to improve the sealing. At the same time, several magnets 33 are embedded in the edge of the front port of the filter box 3, and the magnets 33 are magnetically connected to the panel 71. The panel 71 is made of metal, so that the panel 71 fits tightly to the front port of the filter box 3.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A tail gas treatment device for the production of decabromodiphenyl ethane, comprising a condenser (1), a spray box (2), and a filter box (3) arranged vertically from bottom to top, characterized in that: The condenser (1) has an air inlet pipe (11) on its side and a condensate drain pipe (12) at its bottom. A condenser coil (4) is installed inside the condenser (1), with both ends of the coil (4) extending through the side wall of the condenser (1). The spray box (2) is connected to the condenser (1) via a perforated dome plate (13). An annular pipe (5) is installed inside the spray box (2), with several nozzles (51) evenly distributed on its lower surface. One side of the annular pipe (5) is connected to a nozzle that extends through the spray box. 2) Alkali supply pipe (6) on the side wall, a circular guide groove (22) is provided around the periphery of the spray box (2), and the circular guide groove (22) is connected to the inside of the spray box (2) through the through groove (21). An alkali discharge pipe (23) is provided around the circular guide groove (22). The spray box (2) and the filter box (3) are connected through a partition net (32). An exhaust pipe (31) is provided on the filter box (3). A drawer box (7) is slidably installed inside the filter box (3), and the drawer box (7) is filled with an activated carbon layer (8).

2. The tail gas treatment device for decabromodiphenyl ethane production according to claim 1, characterized in that: The bottom of the condenser (1) adopts a bucket-shaped structure that is wider at the top and narrower at the bottom, and the condensate drain pipe (12) is installed at the lowest point of the bucket-shaped structure.

3. The tail gas treatment device for decabromodiphenyl ethane production according to claim 1, characterized in that: The top plate (13) adopts a tapered structure that is narrow at the top and wide at the bottom, and a conical cover (131) is installed on the through hole of the top plate (13) by a support rod (132).

4. The tail gas treatment device for decabromodiphenyl ethane production according to claim 1, characterized in that: An overflow box (9) is provided below the alkali discharge pipe (23). An overflow hole (91) is provided on the side wall of the overflow box (9), and the horizontal plane where the overflow hole (91) is located is higher than the horizontal plane where the outlet of the alkali discharge pipe (23) is located.

5. The tail gas treatment device for the production of decabromodiphenyl ethane according to claim 4, characterized in that: The overflow box (9) and the condenser box (1) are connected by a hook (92).

6. The tail gas treatment device for decabromodiphenyl ethane production according to claim 1, characterized in that: The front of the drawer box (7) is fitted with a panel (71) for attaching to the front port of the filter box (3), and a sealing strip (72) is provided around the panel (71).

7. The tail gas treatment device for decabromodiphenyl ethane production according to claim 6, characterized in that: The filter box (3) has several magnet blocks (33) embedded on the edge of the front port, and the magnet blocks (33) are magnetically connected to the panel (71).

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