Coking VOCs tail gas recovery mist catcher device

Abstract

A coking VOCs tail gas recovery mist catcher device comprises a cylindrical outer shell, a gas inlet pipe is connected to the lower portion of the outer shell, a gas outlet pipe is connected to the upper portion of the outer shell, the gas inlet pipe and the gas outlet pipe are spaced by 180 degrees on the circumference, a manhole flange is installed on the outer shell, a plurality of layers of stainless steel nets are fixedly arranged in the outer shell, and the number of the stainless steel nets is larger than or equal to 10 meshes. The height of the stainless steel net is 60-100 cm, a plurality of rotating nozzles are installed above the stainless steel net and connected to a liquid inlet pipe, a liquid discharge pipe is connected to the bottom of the outer shell, a steam blowing pipe is arranged at the bottom of the outer shell, and a pressure gauge is installed on a gas outlet pipe. The device can efficiently remove fogdrop harmful substances in the tail gas. And fan liquid accumulation and pipeline blockage can be prevented, the fan load is reduced, and the service life of equipment is prolonged.

Description

Technical Field

[0001] This utility model relates to tail gas recovery in coking, and in particular to a coking VOCs tail gas recovery mist eliminator device, belonging to the technical field of coking-related equipment. Background Technology

[0002] In coking production, exhaust gas is washed by acid and alkali washing towers and then drawn to the next process by exhaust gas fans. In the initial use, it was found that liquid easily accumulates in the exhaust gas fans, and the pipes at the front end of the exhaust gas fans are prone to blockage. Blockage leads to increased fan load and significantly increased energy consumption. Moreover, the liquid accumulation in the exhaust gas fans will definitely shorten the life of the fans. It is believed that the exhaust gas washed by acid and alkali washing towers contains harmful substances such as droplets and naphthalene, which cause the above phenomena. Therefore, how to solve the above problems to extend equipment life and reduce energy consumption is a problem that needs to be solved. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned problems in the recovery of VOCs tail gas from coking plants and to provide a mist eliminator device for recovering VOCs tail gas from coking plants.

[0004] To achieve the purpose of this utility model, the following technical solution is adopted: A coking VOCs tail gas recovery mist eliminator device includes a cylindrical outer shell, an inlet pipe connected to the lower part of the outer shell and an outlet pipe connected to the upper part of the outer shell, the inlet pipe and the outlet pipe being 180 degrees apart on the circumference, a manhole flange installed on the outer shell, multiple layers of stainless steel mesh fixedly installed inside the outer shell, the mesh count of the stainless steel mesh being greater than or equal to 10 mesh, the height of the stainless steel mesh being 60 to 100 cm, multiple rotating nozzles installed above the stainless steel mesh, the rotating nozzles being connected to the liquid inlet pipe, a drain pipe connected to the bottom of the outer shell, a steam purging pipe installed at the bottom of the outer shell, and a pressure gauge installed on the outlet pipe.

[0005] Furthermore, the steam purging pipe has two branches, one of which connects to steam and the other to a drain pipe, and valves are installed on both branches.

[0006] Furthermore, a liquid guiding sloping plate is installed at the bottom of the outer casing, with the lowest point of the liquid guiding sloping plate located at the drain pipe, and the upper and lower spaces of the liquid guiding sloping plate are not isolated.

[0007] Furthermore, the stainless steel mesh has a lower part with 10 mesh and an upper part with 30 mesh, and the overall height of the stainless steel mesh is 70-90cm; the thickness ratio of the upper part to the lower part is 3:5; and the thickness of a single layer of stainless steel mesh is 0.8-1.2mm.

[0008] Furthermore, the drain pipe has a U-shaped section on its exterior.

[0009] The positive and beneficial technical effects of this invention are as follows: This device can efficiently remove harmful substances from exhaust gas droplets. It can prevent liquid accumulation in the fan, pipe blockage, and reduce the fan load, thus extending the service life of the equipment. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the present invention. Detailed Implementation

[0011] To more fully explain the implementation of this utility model, implementation examples are provided. These implementation examples are merely illustrative of this utility model and do not limit its scope.

[0012] The present invention will be further explained in detail with reference to the accompanying drawings, in which the following references are made: 1: outer shell; 2: air inlet pipe; 3: air outlet pipe; 4: pressure gauge; 5: 30-mesh stainless steel mesh layer; 6: 10-mesh stainless steel mesh layer; 7: manhole flange; 8: liquid inlet pipe; 9: rotary nozzle; 10: liquid outlet pipe; 11: U-shaped section; 12: steam purging pipe; 13: first branch; 14: second branch; 15: liquid guide plate.

[0013] As shown in the attached figure, a coking VOCs tail gas recovery mist eliminator device includes a cylindrical outer shell 1, an inlet pipe 2 connected to the lower part of the outer shell, and an outlet pipe 3 connected to the upper part of the outer shell. The inlet pipe and the outlet pipe are 180 degrees apart on the circumference. A manhole flange 7 is installed on the outer shell. Multiple layers of stainless steel mesh are fixedly arranged inside the outer shell. The mesh size of the stainless steel mesh is greater than or equal to 10 meshes. The height of the stainless steel mesh is 60 to 100 cm. In this embodiment, the lower part of the stainless steel mesh is 10 meshes and the upper part is 30 meshes. In the figure, 5 shows the 30 mesh stainless steel mesh layer and 6 shows the 10 mesh stainless steel mesh layer. The height of the entire stainless steel mesh is 70-90 cm. The thickness ratio of the upper part to the lower part is 3:5. The thickness of a single layer of stainless steel mesh is 0.8-1.2 mm.

[0014] Multiple rotating nozzles 9 are installed above the stainless steel mesh, and the rotating nozzles 9 are connected to the liquid inlet pipe 8. A drain pipe 10 is connected to the bottom of the outer casing. The drain pipe has a U-shaped section 11 on the outside, which can form a liquid seal during the draining process to prevent external air from entering. A pressure gauge 4 is installed on the air outlet pipe, and a pressure gauge is installed on the air inlet pipe itself. The degree of blockage of the stainless steel mesh can be judged by the pressure difference between the two sides of the stainless steel mesh, so as to start cleaning. A steam purging pipe 12 is provided at the bottom of the outer casing. In this embodiment, the steam purging pipe has two branches, one branch connected to steam and the other branch connected to the drain pipe. Valves are installed on both branches. The two branches in the figure are the first branch 13 and the second branch 14. The second branch is connected to steam, and the first branch is connected to the drain pipe. When steam is not flowing, the second branch is closed and the first branch is open. When steam is flowing for purging, the second branch is open and the first branch is closed.

[0015] In this embodiment, a liquid guiding inclined plate is installed at the bottom of the outer shell. The lowest point of the liquid guiding inclined plate is located at the drain pipe. The upper and lower spaces of the liquid guiding inclined plate are not isolated. The liquid guiding inclined plate allows the separated liquid to flow to the drain pipe for smooth discharge.

[0016] In this application, the mist eliminator flushing pipe uses the liquid from the alkaline washing tower. The impurities intercepted by the stainless steel mesh are cleaned by rotating nozzles. High-temperature steam is introduced through the steam purging pipe to remove crystals on the stainless steel mesh and prevent blockage. During operation, two sets of this device can be used in parallel, one for backup and one for use.

[0017] When this device is in use, the exhaust gas from the alkaline scrubbing tower enters the mist eliminator at the bottom, passes through the stainless steel wire mesh, exits from the top, and enters the exhaust gas fan. The mist droplets and moisture filtered by the stainless steel mesh flow to the bottom of the mist eliminator and are discharged into the alkaline scrubbing tower through the mist eliminator drain pipe, preventing excessive liquid from flowing into the fan and exhaust gas pipeline. The upper part of the mist eliminator is equipped with a rinsing rotary nozzle to wash away impurities on the wire mesh, and the lower part is equipped with a steam purging pipe to blow away crystals on the wire mesh, reducing the resistance of the mist eliminator and the fan load, thereby reducing the amount of mist droplets and moisture carried in the exhaust gas.

[0018] After a detailed description of the embodiments of this utility model, those skilled in the art will clearly understand that various changes and modifications can be made without departing from the scope and spirit of the above-mentioned patent applications. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the scope of the technical solution of this utility model, and this utility model is not limited to the embodiments of the examples given in the specification.

Claims

1. A coking VOCs tail gas recovery and mist eliminator device, comprising a cylindrical outer shell, an inlet pipe connected to the lower part of the outer shell and an outlet pipe connected to the upper part of the outer shell, the inlet pipe and the outlet pipe being 180 degrees apart circumferentially, and a manhole flange installed on the outer shell, characterized in that: Multiple layers of stainless steel mesh are fixedly installed inside the outer casing. The mesh size is greater than or equal to 10 meshes and the height of the stainless steel mesh is 60 to 100 cm. Multiple rotating nozzles are installed above the stainless steel mesh and connected to the liquid inlet pipe. A liquid outlet pipe is connected to the bottom of the outer casing. A steam purging pipe is installed at the bottom of the outer casing, and a pressure gauge is installed on the steam outlet pipe.

2. The coking VOCs tail gas recovery mist eliminator device according to claim 1, characterized in that: The steam purging pipe has two branches, one of which connects to steam and the other to a drain pipe. Valves are installed on both branches.

3. The coking VOCs tail gas recovery mist eliminator device according to claim 1, characterized in that: A liquid guiding sloping plate is installed at the bottom of the outer casing. The lowest point of the liquid guiding sloping plate is located at the drain pipe, and the upper and lower spaces of the liquid guiding sloping plate are not isolated.

4. The coking VOCs tail gas recovery mist eliminator device according to claim 1, characterized in that: The stainless steel mesh has a 10-mesh lower section and a 30-mesh upper section, with a total height of 70-90cm. The thickness ratio of the upper to the lower section is 3:5, and the thickness of a single layer of stainless steel mesh is 0.8-1.2mm.

5. The coking VOCs tail gas recovery mist eliminator device according to claim 1, characterized in that: The drain pipe has a U-shaped section on the outside.

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