Self-cleaning purification and dust removal system for coke oven gas

Abstract

The utility model discloses a purification and dust removal system for self-cleaning coke oven gas. A gas distributor, a filler internal part, a folded plate demister and a wire mesh demister are sequentially arranged in a purification and demisting dust remover from bottom to top; a pressure monitoring system is arranged on the dust remover tube shell between the folded plate demister and the wire mesh demister; a spraying device is arranged above the gas distributor; a spraying device is arranged above the filler internal part, and a steam backwashing device is arranged below the filler internal part; a backwashing device is arranged below the folded plate demister and the wire mesh demister and is used for monitoring whether the two demisters are blocked or not and carrying out cleaning treatment in time; a forward washing device is also arranged above the wire mesh demister; an inlet of the circulating pump is connected with the bottom of the purification demisting dust remover through a pipeline, and an outlet is connected with the spraying device through a pipeline. The efficient purification and removal of tar and dust in coke oven gas are realized, the problem of system blockage is solved, and the long-period stable operation of the system is ensured.

Description

Technical Field

[0001] The utility model relates to the field of coke oven gas purification, in particular to a self-cleaning coke oven gas purification and dust removal system. Background Art

[0002] As we all know, coke oven gas is a byproduct of the coking industry. It is mixed with a lot of impurities such as dust, tar and naphthalene. After a period of use, it will clog the valves, pipes and pipe fittings in the coke oven system, making it difficult to adjust the fire. The purification of coke oven gas has received more and more attention.

[0003] Although some enterprises have installed purification and dust removal systems to solve the purification and dust removal problems, some impurities such as coal tar, benzene, naphthalene, etc. cannot be removed. In addition, due to the large gas flow rate and low gas flow rate, impurities such as coal tar, benzene, naphthalene, etc. are easily precipitated and attached to the inner wall, packing surface and demister elements, causing blockage of the washing system and demister system, making the purification system ineffective and affecting the long-term safe operation of the equipment. Utility Model Content

[0004] The utility model aims to provide a self-cleaning coke oven gas purification and dust removal system, which realizes the efficient purification and removal of tar and dust in the coke oven gas, solves the problem of system blockage and ensures the long-term stable operation of the system.

[0005] The technical solution adopted by the utility model to solve the above problems is as follows:

[0006] A self-cleaning coke oven gas purification and dust removal system comprises a purification and demisting dust collector, a washing liquid tank, a washing liquid pump and a circulating pump; the purification and demisting dust collector is characterized in that a gas distributor, a packing internal, a folding plate demisting device and a wire mesh demisting device are arranged in sequence from bottom to top; a pressure monitoring system is installed on the dust collector tube shell between the folding plate demisting device and the wire mesh demisting device, and a spray device is arranged above the gas distributor; a spray device is arranged above the packing internal, and a steam backwashing device is arranged below the packing internal;

[0007] A backwash device is provided below the folded plate demister and the wire mesh demister to monitor whether the two demisters are blocked and to clean them in time; a forward washing device is also provided above the wire mesh demister;

[0008] The inlet of the circulation pump is connected to the bottom of the purification demisting and dust collecting device through a pipeline, and the outlet is connected to the spraying device through a pipeline.

[0009] Furthermore, the gas distributor is composed of a main pipe and a plurality of branch pipes with injection pipes or injection holes, and the gas is evenly distributed through injection, and is connected to the air inlet of the purification, demisting and dust removal device.

[0010] Furthermore, the pressure monitoring system is associated with a backwashing device, and the backwashing device is connected to a washing liquid pump and a process water pipeline. When the pressure monitoring system reaches a set value, a backwashing operation is automatically performed.

[0011] Furthermore, the washing liquid tank is provided with a process water interface and a detergent interface, and is also provided with a liquid level control system. The washing liquid pump is connected to the washing liquid tank and the liquid level control system pipeline, and the selection of process water and detergent and the control of backwashing volume are controlled by PLC.

[0012] The utility model has the following beneficial effects

[0013] 1. The purification and demisting dust collector 4 adopts a multi-stage gradient graded washing process and a two-pole demisting device to efficiently purify and remove tar and dust in the coke oven gas, while solving the problem of system blockage and ensuring the long-term stable operation of the system.

[0014] 2. With backwash function, cycle washing and automatic control. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a self-cleaning coke oven gas purification and dust removal system of the utility model;

[0016] Explanation of the accompanying drawings: washing liquid tank 1, liquid level control system 2, washing liquid pump 3; purification demisting and dust collector 4, backwashing device 41, gas distributor 42, packing internals 43, pressure monitoring system 44, folding plate demisting device 45, wire mesh demisting device 46, spraying device 47, steam backwashing device 48, circulating pump 5. DETAILED DESCRIPTION

[0017] The utility model is described in detail below in conjunction with the accompanying drawings.

[0018] like Figure 1 As shown, a self-cleaning coke oven gas purification and dust removal system adopts a self-cleaning system + a coke oven gas purification and dust removal system, including a washing liquid tank 1, a washing liquid pump 3, a purification demisting and dust removing device 4 and a circulation pump 5; a liquid level control system 2 is installed on the washing liquid tank 1.

[0019] The purification mist eliminator 4 adopts a multi-stage gradient graded washing process, and the dust collector shell is provided with a gas distributor 42, a packing internal 43 (the packing is not limited to the regular packing and random packing commonly used in the industry), a folded plate demister 45 and a wire mesh demister 46 from bottom to top.

[0020] A pressure monitoring system 44 is installed on the dust collector shell between the folding plate demister 45 and the wire mesh demister 46, a backwash device 41 is provided below the folding plate demister 45 and the wire mesh demister 46, and a forward washing device is also provided above the wire mesh demister 46. An air inlet is provided in the lower middle part of the dust collector shell, and an air outlet is provided at the top.

[0021] The coke oven gas enters the gas distributor 42 of the purifying demisting and dust collecting device 4 through the air inlet. The structure of the gas distributor 42 allows the gas to enter the purifying demisting and dust collecting device 4 evenly and then reaches the packing internals 43 for separation and purification of gas, liquid and solid phases.

[0022] A spray device 47 is provided above the gas distributor 42. The spray device 47 is connected to the circulation pump 5 through a pipeline. The washing liquid at the bottom of the purification mist remover 4 is evenly sprayed to the upper and lower surfaces of the packing inner part 43 through the circulation pump 5 to form a liquid film to filter the dust impurities in the gas. The spray liquid below first performs a primary washing treatment on the gas before entering the packing inner part 43. The spray device 47 uses a nozzle with a larger diameter to spray the packing to form a liquid film to separate the dust and oil impurities in the gas.

[0023] A spray device 47 is provided above the packing inner part 43, and a steam backwash device is provided below the packing inner part 43, which is opened only when the blockage is serious as a backup.

[0024] The folded plate demister 45 is located above the packing inner part 43, with a spacing of more than 1m and a space for gas-liquid separation. It serves as a first-level demister to separate the mist entrained by the packing washing.

[0025] A wire mesh demister 46 is provided above the folded plate demister 45 as a second-level demister means for separating fine mist droplets and dust impurities that are not completely separated by the folded plate demister 45 .

[0026] The coke oven gas, after being washed and purified by the combination of the packing internals 43 and the spray device 47, enters the two-stage demisting process. When the pressure monitoring system 44 detects that the set value has been reached, the backwashing device 41 performs a backwashing operation. The gas after the two-stage demisting process is discharged through the gas outlet.

[0027] The backwash device 41 is connected to the washing liquid tank 1 and the washing liquid pump 3 through pipelines and process water, and automatically performs backwashing operation when the pressure monitoring system 44 reaches a set value.

[0028] The washing liquid pump 3 is connected to the washing liquid tank 1 through a pipeline. The washing liquid tank 1 is provided with a process water interface and a detergent interface, and is also provided with a liquid level control system 2. The selection of process water and detergent is controlled by PLC, and the backwashing amount is controlled by the washing liquid level.

Claims

1. A self-cleaning coke oven gas purification and dust removal system, comprising a purification demisting and dust removal device (4), a washing liquid tank (1), a washing liquid pump (3) and a circulation pump (5); wherein: A gas distributor (42), a packing inner part (43), a folded plate demister (45) and a wire mesh demister (46) are arranged in sequence from bottom to top in the purification demisting and dust collecting device (4); a pressure monitoring system (44) is installed on the dust collecting device tube shell between the folded plate demister (45) and the wire mesh demister (46); a spray device (47) is arranged above the gas distributor (42); a spray device (47) is arranged above the packing inner part (43); a steam backwashing device (48) is arranged below the packing inner part (43); a backwashing device (41) is arranged below the folded plate demister (45) and the wire mesh demister (46) to monitor whether the two demisters are blocked and to clean them in time; a forward washing device is also arranged above the wire mesh demister (46); the inlet of the circulation pump (5) is connected to the bottom of the purification demisting and dust collecting device (4) through a pipeline, and the outlet is connected to the spray device (47) through a pipeline.

2. A self-cleaning coke oven gas purification and dust removal system as claimed in claim 1, characterized in that The gas distributor (42) is composed of a main pipe and a plurality of branch pipes with injection pipes or injection holes, and is used to evenly distribute the gas through injection. The gas distributor (42) is connected to the air inlet of the purification, demisting and dust removal device (4).

3. A self-cleaning coke oven gas purification and dust removal system as claimed in claim 1, characterized in that The pressure monitoring system (44) is associated with the backwashing device (41), and the backwashing device (41) is connected to the washing liquid pump (3) and the process water pipeline. When the pressure monitoring system (44) reaches a set value, the backwashing operation is automatically performed.

4. A self-cleaning coke oven gas purification and dust removal system as claimed in claim 1, characterized in that The washing liquid tank (1) is provided with a process water interface and a detergent interface, and is also provided with a liquid level control system (2). The washing liquid pump (3) is connected to the washing liquid tank (1) and the liquid level control system (2) through pipelines, and the selection of process water and detergent and the control of backwashing volume are controlled by PLC.

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