Recovery device for benzene in coke oven gas

Abstract

The utility model discloses a device for recovering benzene in coke oven gas. The device comprises a spray tower, a flue gas pipe, a multi-stage filtering device and a maintenance device, the flue gas pipe is positioned on one side of the spray tower, one end is connected with the top end of the spray tower, and the other end is connected with the multi-stage filter device; the maintenance device is connected with the multi-stage filtering device; the multi-stage filtering device comprises a round pipe, a screen, a separation box, activated carbon and a cleaning device; the top end of the maintenance device is connected with one end of a circular pipe through a flue gas pipe; the screen is positioned on the inner wall of the circular tube; the separation box is fixedly mounted in the middle of the flue gas pipe; activated carbon is inserted into the inner wall of the separation box through an insertion plate; fixing is carried out through the maintenance device; the cleaning device is located in the round pipe and connected with the screen; according to the utility model, large-particle impurities are primarily filtered and removed through the screen of the multi-stage filtering device, and smaller pollutants are secondarily filtered and removed through the activated carbon, so that the coal gas is fully purified, and the purity of the flue gas before entering the spray tower is effectively improved, thereby improving the quality and efficiency of benzene recovery.

Description

Technical Field

[0001] The utility model relates to the technical field of coke oven gas recovery, in particular to a device for recovering benzene in coke oven gas. Background Art

[0002] Coke oven gas benzene recovery is an important technology in the chemical industry. Its purpose is to extract benzene compounds from coke oven gas. These compounds are important raw materials in chemical production. This process can fully utilize the benzene resources in coke oven gas, reduce resource waste and environmental pollution, and provide important raw materials for the chemical industry. It has positive significance for promoting economic development and environmental protection.

[0003] When recovering benzene from coke oven gas, the gas enters an absorption tower and comes into countercurrent contact with wash oil sprayed from the top of the tower. The wash oil absorbs the benzene in the gas. However, when recovering benzene from the gas, the gas itself contains a large amount of impurities, which can easily affect the purity of the benzene purification, resulting in low benzene recovery efficiency. To improve recovery efficiency, the gas is usually pretreated before entering the absorption tower, including mechanical filtration, adsorption filtration, and wet filtration, to remove impurities in the gas. In the existing technology, benzene is usually recovered by multiple filtration and purification methods. Although this can improve the purity of benzene, it uses more equipment, which increases the difficulty of equipment operation. Utility Model Content

[0004] The purpose of the utility model is to provide a benzene recovery device in coke oven gas that can effectively filter impurities and thus improve the quality and efficiency of benzene recovery and is simple to operate, so as to solve the technical problem that the gas itself contains a large amount of impurities, which easily affects the purity of benzene purification and leads to low benzene recovery efficiency.

[0005] In order to solve the above technical problems, the solutions adopted by the present invention are as follows:

[0006] A benzene recovery device in coke oven gas, comprising a spray tower, a flue gas pipe, a multi-stage filtering device and a maintenance device; the flue gas pipe is located on one side of the spray tower, one end is connected to the top of the spray tower, and the other end is connected to the multi-stage filtering device; the maintenance device is connected to the multi-stage filtering device, and the multi-stage filtering device ensures that the coal gas is fully purified, thereby improving the quality and efficiency of benzene recovery; the multi-stage filtering device comprises a circular tube, a screen, a separation box, activated carbon and a cleaning device; the top of the maintenance device is fixedly connected to one end of the circular tube through the flue gas pipe; the screen is fixedly mounted on the inner wall of the circular tube; the separation box is fixedly mounted in the middle of the flue gas pipe; the activated carbon is inserted into the inner wall of the separation box through a plug-in plate and is fixed by the maintenance device; through preliminary filtration by the screen and secondary filtration by the activated carbon, impurities of different sizes can be effectively removed, thereby further improving the purity of the flue gas, ensuring the smooth progress of the coke oven gas benzene recovery process, and thereby improving the recovery efficiency of the equipment. The cleaning device is located in the circular tube and is connected to the screen. The cleaning device can clean the smoke and dust attached to the screen to avoid the smoke and dust from accumulating in the screen and affecting the subsequent filtration of the smoke.

[0007] Furthermore, the cleaning device includes a circular roller, a brush, and a servo motor; the servo motor is fixedly mounted on one side of the screen; the output end of the servo motor passes through the screen and is fixedly connected to the brush; the circular roller is fixedly mounted on the other side of the screen. When the servo motor is activated, the servo motor rotates, driving the brush, which in turn drives the bristles to clean the surface of the screen. Impurities adhere to the bristles, cleaning the screen. As the bristles pass through the circular roller, the circular roller scrapes away impurities on the surface of the bristles, preventing impurities on the brush from repeatedly adhering to the screen.

[0008] Furthermore, the cleaning device includes a valve and a discharge pipe; the discharge pipe is fixedly installed directly below the screen and connected to the valve. Impurities on the screen are scraped off by a brush and a circular roller and collected on the discharge pipe directly below the screen. When the impurities in the discharge pipe accumulate to a certain level, the lower end of the discharge pipe is opened by a valve to remove the impurities.

[0009] Furthermore, the maintenance device includes a rod, a clamp, and a magnet; the clamp is located at the lower end of the plug plate of the separation box; a magnet is fixedly connected to the surface of the separation box; the rod is fixedly mounted on the surface of the magnet; the clamp is provided with an opening that matches the rod; the clamp and the magnet are magnetically connected; and two maintenance devices are provided, symmetrically mounted at the upper and lower ends of the plug plate. When the activated carbon needs to be replaced, the clamp is pulled to separate the magnet from the clamp. After removing the old activated carbon, the new activated carbon is placed on the plug plate and inserted into the separation box. The rod is inserted into the clamp through the opening. The adsorption force of the magnet and the clamp is used to firmly fix the activated carbon in the separation box, ensuring that the activated carbon does not shift during the flue gas filtration process.

[0010] The working principle of this utility model is as follows:

[0011] The coal gas enters through the flue pipe and passes through the screen of the multi-stage filter device. The screen performs a preliminary filtration on the flue gas. The filtered flue gas passes through the screen and reaches the separation box. The flue gas is filtered again by the activated carbon. Fine impurities are adsorbed on the activated carbon. The flue gas then enters the spray tower for recovery. At the same time, the servo motor is started, and the servo motor drives the brush to rotate. The brush rotates and drives the soft bristles to clean the surface of the screen. Impurities adhere to the soft bristles. When the soft bristles pass through the round roller, the round roller scrapes the impurities on the surface of the soft bristles and drops them into the discharge pipe. The valve controls the opening and closing of the discharge pipe to remove the impurities. When the activated carbon needs to be replaced, the card block is pulled, and the magnet separates from the card block. The activated carbon can be removed and new activated carbon is inserted into the separation box. The rod body is inserted into the card block, and the magnet adsorbs the card block. The activated carbon can then be replaced. The beneficial effects of this utility model are as follows:

[0012] 1. The utility model uses the screen of the multi-stage filtration device to initially filter out large particles of impurities, and the activated carbon secondary filtration to remove smaller pollutants, ensuring that the gas is fully purified and effectively improving the purity of the flue gas before entering the spray tower, thereby improving the quality and efficiency of benzene recovery.

[0013] 2. The utility model can clean the impurities on the screen through the round roller, brush and servo motor of the cleaning device, avoid the accumulation of impurities on the screen and cause the screen to be blocked, thereby ensuring the continuity of the filtering effect. At the same time, the cleaned impurities can be taken out through the valve and the discharge pipe to avoid impurity accumulation and ensure the smooth progress of the coke oven gas benzene recovery process.

[0014] 3. The utility model can quickly replace the activated carbon through the rod, block and magnet of the maintenance device, and the activated carbon is fixed by the adsorption force of the magnet and the block. The overall operation is simple and the activated carbon is convenient to replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0016] Figure 2 This is a rear view structural diagram of the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the maintenance device of the present utility model;

[0018] Figure 4 This is a schematic structural diagram of the multi-stage filtering device of the utility model;

[0019] Figure 5 This is a schematic diagram of the connection structure between the servo motor and the screen mesh of the utility model.

[0020] In the figure: 1. Spray tower; 2. Flue gas pipe; 3. Multi-stage filtration device; 31. Round tube; 32. Screen; 33. Round roller; 34. Brush; 35. Valve; 36. Discharge pipe; 37. Separation box; 38. Activated carbon; 39. Servo motor; 4. Maintenance device; 41. Rod; 42. Block; 43. Magnet. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention. The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, unless otherwise expressly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections, indirect connections through an intermediate medium, or internal connections between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] The following is a detailed description of the benzene recovery device in coke oven gas according to the present invention in conjunction with the accompanying drawings: Example 1

[0024] A device for recovering benzene from coke oven gas, comprising a spray tower 1, a flue gas pipe 2, a multi-stage filtering device 3 and a maintenance device 4; the flue gas pipe 2 is located on one side of the spray tower 1, one end of which is connected to the top of the spray tower 1, and the other end of which is connected to the multi-stage filtering device 3; the maintenance device 4 is connected to the multi-stage filtering device 3; the multi-stage filtering device 3 comprises a circular tube 31, a screen 32, a separation box 37, activated carbon 38 and a cleaning device; the top of the maintenance device 4 is fixedly connected to one end of the circular tube 31 through the flue gas pipe 2; the screen 32 is fixedly mounted on the inner wall of the circular tube 31; the separation box 37 is fixedly mounted in the middle of the flue gas pipe 2; the activated carbon 38 is inserted into the inner wall of the separation box 37 through a plug-in plate and is fixed by the maintenance device 4; the cleaning device is located in the circular tube 31 and is connected to the screen 32.

[0025] The working principle of this embodiment is as follows:

[0026] The coal gas enters through the flue gas pipe 2 and passes through the screen 32 of the multi-stage filtering device 3. The screen 32 performs preliminary filtration on the flue gas. The filtered flue gas passes through the screen 32 and reaches the separation box 37. The flue gas is filtered again by the activated carbon 38. Fine impurities are adsorbed on the activated carbon 38. Then the flue gas enters the spray tower 1 for recovery. The smoke dust attached to the screen 32 is cleaned by the cleaning device to prevent the mesh of the screen 32 from being blocked and affecting the subsequent flue gas filtration. Example 2

[0027] The difference from Example 1 is that the cleaning device includes a round roller 33, a brush 34 and a servo motor 39; the servo motor 39 is fixedly mounted on one side of the screen 32; the output end of the servo motor 39 passes through the screen 32 and is fixedly connected to the brush 34; the round roller 33 is fixedly mounted on the other side of the screen 32; the cleaning device includes a valve 35 and a discharge pipe 36; the discharge pipe 36 is fixedly mounted directly below the screen 32 and is connected to the valve 35; the servo motor 39 drives the brush 34 to rotate, and the rotation of the brush 34 drives the soft bristles to clean the surface of the screen 32, and impurities adhere to the soft bristles. When the soft bristles pass through the round roller 33, the round roller 33 scrapes the impurities on the surface of the soft bristles and drops them into the discharge pipe 36, so as to prevent the impurities on the brush 34 from repeatedly adhering to the screen 32, and the valve 35 controls the opening and closing of the discharge pipe 36 to remove the impurities.

[0028] The working principle of this embodiment is the same as that of embodiment 1. Example 3

[0029] The difference from Example 2 is that the maintenance device 4 includes a rod body 41, a block 42 and a magnet 43; the block 42 is located at the lower end of the plug plate of the separation box 37; the surface of the separation box 37 is fixedly connected to the magnet 43; the rod body 41 is fixedly mounted on the surface of the magnet 43; the block 42 is provided with an opening matching the rod body 41; the block 42 and the magnet 43 are magnetically connected; the maintenance device 4 is provided with two, which are symmetrically mounted at the upper and lower ends of the plug plate.

[0030] Pull the block 42 on the plug plate to separate the magnet 43 from the block 42, pull the activated carbon 38 out of the separation box 37, remove the used activated carbon 38, and insert new activated carbon 38 into the separation box 37 to replace the activated carbon 38. Push the plug plate back to insert the rod 41 into the opening of the block 42. The magnet 43 and the block 42 are attracted to each other. The adsorption force between the magnet 43 and the block 42 firmly fixes the activated carbon 38 in the separation box 37, ensuring that the activated carbon 38 will not shift during the smoke filtration process.

[0031] The working principle of this embodiment is the same as that of embodiment 2.

[0032] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for recovering benzene from coke oven gas, characterized by: It comprises a spray tower (1), a flue gas pipe (2), a multi-stage filtering device (3) and a maintenance device (4); the flue gas pipe (2) is located on one side of the spray tower (1), one end of which is connected to the top of the spray tower (1), and the other end of which is connected to the multi-stage filtering device (3); the maintenance device (4) is connected to the multi-stage filtering device (3); The multi-stage filtering device (3) comprises a circular tube (31), a screen (32), a separation box (37), activated carbon (38) and a cleaning device; the top end of the maintenance device (4) is fixedly connected to one end of the circular tube (31) through the flue gas pipe (2); the screen (32) is fixedly mounted on the inner wall of the circular tube (31); the separation box (37) is fixedly mounted in the middle of the flue gas pipe (2); the activated carbon (38) is inserted into the inner wall of the separation box (37) through a plug-in plate and is fixed by the maintenance device (4); the cleaning device is located in the circular tube (31) and is connected to the screen (32).

2. The device for recovering benzene from coke oven gas according to claim 1, wherein: The cleaning device comprises a round roller (33), a brush (34) and a servo motor (39); the servo motor (39) is fixedly mounted on one side of the screen (32); the output end of the servo motor (39) passes through the screen (32) and is fixedly connected to the brush (34); the round roller (33) is fixedly mounted on the other side of the screen (32).

3. The device for recovering benzene from coke oven gas according to claim 2, wherein: The cleaning device comprises a valve (35) and a discharge pipe (36); the discharge pipe (36) is fixedly installed directly below the screen (32) and is connected to the valve (35).

4. The device for recovering benzene from coke oven gas according to claim 1, wherein: The maintenance device (4) comprises a rod (41), a clamping block (42) and a magnet (43); the clamping block (42) is located at the lower end of the plug plate of the separation box (37); the surface of the separation box (37) is fixedly connected with the magnet (43); the rod (41) is fixedly mounted on the surface of the magnet (43); the clamping block (42) is provided with an opening matching the rod (41); the clamping block (42) and the magnet (43) are magnetically connected; the maintenance device (4) is provided with two, which are symmetrically mounted at the upper and lower ends of the plug plate.

Images