Demisting and dedusting tower for coke oven gas

Abstract

A coke oven gas demisting and dedusting tower aims to solve the problems that coke oven gas treated in the prior art still contains part of coal ash, coal tar, benzene, naphthalene and other impurities which are easily precipitated and attached to pipeline walls, filler surfaces and valves of compressors, so that pipelines are blocked, fillers are bonded, the repair cycle of the compressors and other equipment is shortened, and the maintenance cost is low. The coke oven gas desulfurization tower comprises a tower body, a coke oven gas inlet, a fin type inlet distributor, a filler assembly, a circulating liquid spraying pipe and a steam flushing opening, a folded plate demister and a folded plate demister flushing port; according to the utility model, the demisting efficiency is improved, the separation efficiency is extremely high, the device is easy to clean, and the problems that impurities such as coal ash, coal tar, benzene, naphthalene and the like are easy to precipitate and attach to the pipeline wall, the filler surface and the valve of the compressor, so that the pipeline is blocked, the filler is adhered, the repair cycle of equipment such as the compressor is shortened, and the service life of the equipment is prolonged are solved. And the long-period safety of the equipment is influenced.

Description

Technical Field

[0001] The utility model belongs to the field of coal chemical production, and in particular relates to a demisting and dust removing tower for coke oven gas. Background Art

[0002] Since the coke oven gas after pre-treatment still contains some impurities such as coal ash, coal tar, benzene, naphthalene, etc., a large amount of benzene and naphthalene will enter the next process. In addition, due to the large gas flow rate and low gas flow rate, impurities such as coal tar, benzene, naphthalene, etc. are easy to precipitate and adhere to the pipe wall, the surface of the packing and the valve of the compressor, resulting in the blockage of the pipeline, the adhesion of the packing, the shortening of the maintenance cycle of the compressor and other equipment, and affecting the long-term safe operation of the equipment. Utility Model Content

[0003] In order to solve the problem that the coke oven gas treated by the existing technology still contains some impurities such as fly ash, coal tar, benzene, naphthalene, etc., which are easy to precipitate and adhere to the pipeline wall, the surface of the filler and the valve of the compressor, causing the pipeline to be blocked, the filler to stick, the maintenance cycle of the compressor and other equipment to be shortened, and the long-term safety of the equipment is affected.

[0004] The utility model discloses a coke oven gas demisting and dust removing tower, comprising a tower body, a coke oven gas inlet is arranged on the side of the lower part of the tower body, a finned inlet distributor is arranged at the bottom of the tower body, the coke oven gas inlet is connected to the finned inlet distributor, a packing assembly is arranged above the inlet distributor in the tower body, a circulating liquid spray pipe is arranged on the upper and lower sides of the packing assembly, and a steam flushing port is arranged at the lower part of the packing assembly;

[0005] The upper part of the tower body is provided with two upper and lower parallel partition baffles, a folding plate demister is vertically provided between the two partition baffles, and a folding plate demister flushing port is provided in front of the folding plate demister;

[0006] A coalescing demisting element is provided at the top of the tower body, a demisting element supporting flower plate is provided at the lower part of the coalescing demisting element, an upper demisting element flushing port is provided above the coalescing demisting element, and a lower demisting element flushing port is provided below the coalescing demisting element;

[0007] A coke oven gas outlet is arranged on the top of the tower body.

[0008] A manhole and an inspection port are arranged on the outer side of the tower body.

[0009] The circulating liquid spray pipe is arranged in a tree-like shape, including spray branch pipes and spray pipes, and the orientations of the two layers of spray pipes differ by 45 degrees, the branch pipes and the spray pipes are 90 degrees, and the orientations of the upper and lower layers of branch pipes are also staggered at 45 degrees to each other; the spray angle of a nozzle of the branch pipe close to the tower body is 90 degrees, and the rest are 120 degrees.

[0010] The steam flushing port is in a ring shape, and is divided into inner and outer circles according to the diameter of the equipment. The spray angle of the outer circle nozzle is 90 degrees, and the rest is 120 degrees.

[0011] The coalescing and demisting element is a loose mesh structure woven from fibers.

[0012] The folded plate demister adopts a high-efficiency double-bladder blade separation demister

[0013] The packing assembly comprises a packing, a packing support grid plate and a packing gland.

[0014] Advantages of this utility model:

[0015] The utility model greatly improves the demisting efficiency, has extremely high separation efficiency, and is easy to clean, and solves the problem that impurities such as coal ash, coal tar, benzene, naphthalene, etc. are easily precipitated and attached to the pipeline wall, the filler surface and the valve of the compressor, causing pipeline blockage, filler adhesion, shortening the maintenance cycle of equipment such as compressors, and affecting the long-term safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 This is a schematic diagram of the structure of the utility model:

[0017] Explanation of reference numerals: 1, tower body; 2, coke oven gas inlet; 3, finned inlet distributor; 4, circulating liquid spray pipe; 5, steam flushing port; 6, packing assembly; 7, folded plate demister; 8, partition baffle; 9, folded plate demister flushing port; 10, demister element lower flushing port; 11, coalescing demister element; 12, demister element upper flushing port; 13, coke oven gas outlet; 14, manhole; 15, demister element support disc; 16, inspection port DETAILED DESCRIPTION

[0018] like Figure 1 The utility model is a coke oven gas demisting and dust removal tower, comprising a tower body 1, a coke oven gas inlet 2 is provided on the lower side of the tower body 1, a finned inlet distributor 3 is provided at the bottom of the tower body 1, the coke oven gas inlet 2 is connected to the finned inlet distributor 3, a packing assembly 6 is provided above the inlet distributor 3 in the tower body 1, a circulating liquid spray pipe 4 is provided on the upper and lower sides of the packing assembly 6, and a steam flushing port 5 is provided at the lower part of the packing assembly 6;

[0019] The tower body 1 is provided with two upper and lower parallel partition baffles 8 in the upper part, a folded plate demister 7 is vertically provided between the two partition baffles 8, and a folded plate demister flushing port 9 is provided in front of the folded plate demister 7;

[0020] A coalescing demisting element 11 is provided at the top of the tower body 1, a demisting element supporting flower plate 15 is provided at the lower part of the coalescing demisting element 11, a demisting element upper flushing port 12 is provided above the coalescing demisting element 11, and a demisting element lower flushing port 10 is provided below the coalescing demisting element 11;

[0021] A coke oven gas outlet 13 is provided at the top of the tower body 1 .

[0022] A manhole 14 and an inspection opening 16 are provided on the outer side of the tower body 1 .

[0023] The circulating liquid spray pipe 4 is arranged in a tree-like shape, including a spray branch pipe and a spray pipe, and the orientations of the two layers of spray pipes differ by 45 degrees, the branch pipes and the spray pipes are 90 degrees, and the orientations of the upper and lower layers of branch pipes are also staggered at 45 degrees to each other; the spray angle of a nozzle of the branch pipe close to the tower body 1 is 90 degrees, and the others are 120 degrees.

[0024] The steam flushing port 4 is in a ring shape and is divided into inner and outer circles according to the diameter of the equipment. The spraying angle of the outer circle nozzle is 90 degrees, and the other ones are 120 degrees.

[0025] The coalescing and demisting element 11 is a loose mesh structure woven from extremely fine fibers and has a large surface area.

[0026] The folding plate demister 7 adopts a high-efficiency double-blade separation demister

[0027] The packing assembly 6 is a bulk random packing, a packing support grid, and a packing gland.

[0028] During installation: the coke oven gas inlet 2 is located at the lower part of the tower body 1 and is welded to the tower body 1 ; the finned inlet distributor 3 is located inside the tower body 1 and is welded to the coke oven gas inlet 2 .

[0029] The circulating liquid spray pipe 4 is located at the upper and lower parts of the packing assembly 6, and is fixed to the tower body 1 by flanges. The spray pipes are arranged in a tree-like shape, and the orientations of the two layers of spray pipes differ by 45 degrees. The spray branch pipes are connected to the spray pipes by flanges, and the branch pipes are 90 degrees to the spray pipes. The orientations of the upper and lower branches are also staggered at 45 degrees. The spray angle of a nozzle near the tower wall is 90 degrees, and the others are 120 degrees.

[0030] The steam flushing port 5 is close to the lower part of the packing component layer 6 and is fixed to the tower body 1 by a flange. The flushing pipe is ring-shaped and is divided into inner and outer circles according to the diameter of the equipment. The spraying angle of the outer circle nozzle is 90 degrees, and the rest are 120 degrees.

[0031] The packing washing assembly 6 is located between the two sets of circulating liquid spray washing devices 4 and is welded and fixed to the tower body 1 .

[0032] The folded plate demister 7 is located above the upper circulating liquid spray pipe 4 and is connected to the tower body 1 through a partition baffle 8. It is vertically installed at the axis of the tower body, and the partition baffle 8 is divided into two parts, upper and lower, connected to the folded plate demister 7 and the tower body 1, so that the airflow is forced to change its flow direction.

[0033] A folded plate demister flushing port 9 is installed in front of the folded plate demister 7. It is fixed to the tower body 1 by a flange, and the flushing branch pipe is arranged in a tree-like shape and connected to the main pipe by a flange.

[0034] The coalescing demisting element 11 is vertically mounted on the demisting element supporting disc 15 , and the demisting element supporting disc 15 is welded to the tower body 1 .

[0035] The spray pipe branch pipe and the nozzle, the folding plate demister 7, can be inspected and replaced through the manhole 14. The coalescing demister element 11 can be replaced through the inspection port 16. The manhole 14 and the inspection port 16 are welded to the tower body 1.

[0036] The working principle of the utility model is that the coke oven gas filtered by the coke filter enters the equipment from the lower half of the demister and dust collector, and a fin inlet distributor 3 is installed at the entrance. Most of the impurities such as tar dust and naphthalene in the coke oven gas are first thrown to the fin wall by inertial force, and impurities such as oil dust and naphthalene flow into the liquid storage section at the bottom of the tower in the form of droplets. The gas rises along the cross section of the tower body after being evenly distributed by the fin distributor 3. It is first sprayed and washed by the circulating liquid spray pipe 4 and the steam flushing port 5 washing liquid, and then passes through the packing layer of the packing component 6 to make the gas and liquid fully contact. After passing through a group of circulating liquid spray pipes 4 spray washing devices, the tar and other impurities in the gas are removed. Finally, through the folded plate demister 7, the tiny droplets in the coke oven gas hit the blades and condense and form a liquid film on the blade surface. Fall down to the bottom of the tower. Part of the water mist that has not been condensed is re-agglomerated in the coalescing demister element 11, and finally a clean coke oven gas that meets the process requirements is obtained.

[0037] The utility model includes the following:

[0038] 1. The inlet pipe is provided with a fin inlet distributor 3. After the inlet gas flows through the fins which form a certain angle with the radial direction of the cylinder, the high-density impurities such as oil dust in the tail gas are pre-separated under the action of inertial force. The oil dust flows into the liquid storage tank at the bottom of the tower along the fin wall in the form of droplets. At the same time, after passing through the fin inlet distributor 3, the gas rises evenly along the cross section of the tower.

[0039] 2. The two layers of circulating liquid spray pipes 4 are arranged in a tree-like shape, and the orientation of the two layers of circulating liquid spray pipes 4 is 45 degrees different, and the branch pipes are also staggered at 45 degrees. This is to allow the sprayed washing liquid to reach 200% coverage of the entire area. The spray angle of a nozzle close to the tower wall of the branch pipe is 90 degrees, and the others are 120 degrees. This is to avoid the washing liquid from the outer nozzle being sprayed on the tower wall in large quantities, wasting the washing liquid and causing scouring of the tower wall.

[0040] 3. The packing assembly 6 is located between the two groups of circulating liquid spray pipes 4. When the roughly washed gas passes through the packing layer, the tiny particles in the tail gas are constantly in full contact with the washing liquid, condense and grow again, and adsorb on the surface of the packing. At the same time, the upper spray pipe is at a certain height from the packing, which acts as a spray wetting for the packing and can also perform secondary washing on the coke oven gas.

[0041] 4. The steam flushing port 5 at the lower part of the packing assembly 6 is used to flush the packing layer at regular intervals. The flushing direction is consistent with the gas flow direction.

[0042] 5. The folding plate demister 7 adopts a high-efficiency double-bag blade separation demister, which has the advantages of simple structure, high capture efficiency for medium-sized and large-sized droplets, relatively low pressure drop, and easy flushing. When the gas containing mist flows through the tortuous channel of the blade at a certain speed, the flow direction is changed many times, causing the droplets to hit the surface of the blade under the action of inertia and be captured, until the accumulated droplets are large enough that the gravity generated by themselves exceeds the combined force of the gas's rising force and the liquid's surface tension, and the droplets are separated from the surface of the blade plate. The multi-fold structure of the blade plate increases the chance of mist capture, and the mist that is not removed is captured at the next turn through the same action. This repeated action greatly improves the demisting efficiency. Adding a collection liquid bag at the corner of the blade can help capture droplets in the gas and prevent the captured droplets from being carried away by the high-speed flowing gas to form secondary mist entrainment, thereby improving the separation efficiency of the blade.

[0043] 6. The coalescing demisting element 11 is a loose mesh structure woven from extremely fine fibers with a relatively large surface area. Tiny dust droplets collide on its surface many times and continuously condense and grow, thereby bringing extremely high separation efficiency and being easy to clean.

Claims

1. A coke oven gas demisting and dust removal tower, comprising a tower body (1), characterized in that: A coke oven gas inlet (2) is provided on the side of the lower part of the tower body (1); a finned inlet distributor (3) is provided at the bottom of the tower body (1); the coke oven gas inlet (2) is connected to the finned inlet distributor (3); a packing assembly (6) is provided above the finned inlet distributor (3) in the tower body (1); a circulating liquid spray pipe (4) is provided on each of the upper and lower sides of the packing assembly (6); a steam flushing port (5) is provided at the lower part of the packing assembly (6); and two upper and lower parallel partition baffles are provided at the upper part of the tower body (1). (8), a folded plate demister (7) is vertically provided between the two partition baffles (8), and a folded plate demister flushing port (9) is provided in front of the folded plate demister (7); a coalescing demister element (11) is provided at the top of the tower body (1), a demister element supporting flower disc (15) is provided at the bottom of the coalescing demister element (11), a demister element upper flushing port (12) is provided above the coalescing demister element (11), and a demister element lower flushing port (10) is provided below the coalescing demister element (11); and a coke oven gas outlet (13) is provided at the top of the tower body (1).

2. A coke oven gas demisting and dust removal tower as claimed in claim 1, characterized in that: A manhole (14) and an inspection opening (16) are provided on the outside of the tower body (1).

3. A coke oven gas demisting and dust removal tower as claimed in claim 1, characterized in that: The circulating liquid spray pipe (4) is arranged in a tree-like shape, including spray branch pipes and spray pipes, and the orientations of the two layers of spray pipes differ by 45 degrees, the branch pipes and the spray pipes are 90 degrees, and the orientations of the upper and lower layers of branch pipes are also staggered at 45 degrees to each other; the spray angle of a nozzle of the branch pipe close to the tower body (1) is 90 degrees, and the remaining ones are 120 degrees.

4. A coke oven gas demisting and dust removal tower as claimed in claim 1, characterized in that: The steam flushing port (5) is in the shape of a ring and is divided into inner and outer rings according to the diameter of the equipment. The spraying angle of the outer ring nozzle is 90 degrees, and the other ones are 120 degrees.

5. A coke oven gas demisting and dust removal tower as claimed in claim 1, characterized in that: The coalescing demisting element (11) is a loose mesh structure woven from fibers.

6. A coke oven gas demisting and dust removal tower as claimed in claim 1, characterized in that: The folded plate demister (7) adopts a high-efficiency double-blade separation demister.

7. A coke oven gas demisting and dust removal tower as claimed in claim 1, characterized in that: The packing assembly (6) comprises a packing, a packing support grid plate and a packing gland.

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