Coke oven flue gas dust removal device

Abstract

The utility model discloses a coke oven flue gas dust removal device, and belongs to the field of ferrous metallurgy. The dust collector comprises a filter chamber and an ash hopper located below the filter chamber, a smoke inlet is formed in the position, close to the filter chamber, of the upper portion of the side wall of the ash hopper, a smoke outlet is formed in the upper portion of the side wall of the filter chamber, membrane pipes which are vertically arranged in the axial direction are arranged in the filter chamber at intervals, and ceramic filter elements are arranged in the membrane pipes. The coke oven flue gas active coke desulfurization and denitrification device is used in the existing coke oven flue gas active coke desulfurization and denitrification process, and can realize efficient removal of small-particle-size particulate matters after dust removal of harmful gas in the coke oven flue gas in the existing process, so that the pollution of the discharged coke oven flue gas to the environment is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of iron and steel metallurgy, and more specifically relates to a coke oven smoke dust removal device. Background Art

[0002] In metallurgical production, if the coke oven flue gas is discharged directly without treatment, it will cause environmental pollution. The main pollutants in coke oven flue gas are particulate matter, SO2 and NO x , it needs to be treated to meet the standards before being discharged. The existing technology uses the integrated coordinated treatment technology of activated coke to treat the flue gas of coke ovens, but the acid gas after denitrification and regeneration is high-concentration SO2, which has high temperature and strong corrosiveness, and still causes great pollution to the environment. In addition, small particles are difficult to remove, which affects gas phase transportation. Traditional processes all use solid-liquid separation technology in the liquid phase, but acidic water slag will be produced, which is easy to cause secondary environmental problems.

[0003] In view of the above problems, a perfect method is needed to simultaneously deal with the harmful gases and particulate matter in the coke oven flue gas and other pollution factors to reduce the pollution of the environment caused by the emission of coke oven flue gas.

[0004] The Chinese patent application number is: CN202011572445.9, and the patent document with the publication date of May 4, 2021 discloses a coke oven flue gas activated coke desulfurization and denitrification system and process, the system includes a fan system, a flue gas treatment system, an adsorption and analysis system, an activated coke transfer system, an adsorption tower ammonia supply system, an analysis heating and cooling system, and a dust collection and treatment system; the fan system is provided with a main fan, the flue gas treatment system is provided with a heat transfer oil heat exchanger and an atomizing nozzle, the adsorption and analysis system is provided with an activated coke adsorption tower and an analysis tower; the activated coke transfer system is provided with a loading chain bucket conveyor, a unloading chain bucket conveyor, a vibrating screening device, and a new material silo; the adsorption tower ammonia supply system is provided with an ammonia-air mixer and an ammonia dilution fan; the analysis heating and cooling system is provided with a hot air furnace; the dust collection and treatment system is provided with a dust collector, a dust removal fan, and an ash silo.

[0005] The above system can remove harmful gases in coke oven flue gas and is equipped with a dust collector to separate particulate matter in the coke oven flue gas. However, conventional dust removal devices are difficult to remove small-sized particles in the coke oven flue gas, and there will still be a large number of small-sized particles in the exhausted flue gas, causing great pollution to the environment. Summary of the invention

[0006] 1. Problems to be solved

[0007] In view of the problem that it is difficult to effectively remove small-size particles in coke oven flue gas when treating coke oven flue gas with existing technologies, the utility model provides a coke oven flue gas dust removal device, which is used in the existing coke oven flue gas activated coke desulfurization and denitrification process. It can achieve efficient removal of small-size particles after the harmful gases in the coke oven flue gas are dusted by the existing process, thereby reducing the pollution caused to the environment by the discharged coke oven flue gas.

[0008] 2. Technical solution

[0009] To solve the above problems, the utility model adopts the following technical solutions.

[0010] A coke oven flue gas dust removal device comprises a filter chamber and an ash hopper located below the filter chamber, a flue gas inlet is provided on the upper part of the side wall of the ash hopper near the filter chamber, a flue gas outlet is provided on the upper part of the side wall of the filter chamber, membrane tubes arranged vertically in an axial direction are arranged at intervals in the filter chamber, and ceramic filter elements are provided in the membrane tubes.

[0011] As a further improvement of the technical solution, a suspension rod arranged axially and vertically is installed on the top of the filter chamber, and a cross bar is connected to the bottom of the suspension rod; the upper end of the membrane tube is connected to the top of the filter chamber through a ceramic fiber gasket, and a positioning hole is provided at the lower end of the membrane tube, and a positioning pin matching the positioning hole is installed on the cross bar.

[0012] As a further improvement of the technical solution, an ash discharge valve is installed on the ash hopper.

[0013] As a further improvement of the technical solution, there are two ash discharge valves, which are respectively installed on the upper part and the lower part of the ash hopper.

[0014] As a further improvement of the technical solution, a vibration motor is fixedly installed on the side of the ash hopper.

[0015] As a further improvement of the technical solution, a level meter is installed on the side of the ash hopper.

[0016] As a further improvement of the technical solution, a nitrogen inlet is installed on the top of the filter chamber, and the nitrogen inlet is connected to an external nitrogen source through a nitrogen delivery pipeline.

[0017] As a further improvement of the technical solution, a nitrogen preheater is installed on the nitrogen delivery pipeline.

[0018] As a further improvement of the technical solution, an inspection pipe is installed on the side of the ash hopper.

[0019] 3. Beneficial effects

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] (1) The utility model discloses a coke oven flue gas dust removal device, in which membrane tubes with ceramic filter elements are arranged at intervals in a filter chamber, and high-temperature flue gas enters the filter chamber from the flue gas inlet on the ash hopper. Larger dust particles in the dust-containing gas settle into the ash hopper under the action of their own weight and collision, while finer dust particles are adsorbed on the outer surface of the ceramic filter element. The gas purified by the filter element enters the upper part of the dust removal device and is discharged through the flue gas outlet, thereby effectively reducing the pollution caused by the coke oven flue gas to the environment.

[0022] (2) The utility model provides a coke oven flue gas dust removal device, in which the upper end of the membrane tube is connected to the top of the filter chamber through a ceramic fiber gasket to achieve buffer fixation, and the lower end of the membrane tube is fixed by a positioning hole and a positioning pin of the suspension rod, thereby ensuring that the membrane tube cannot shake during use, greatly reducing the probability of the membrane tube breaking due to shaking;

[0023] (3) The utility model provides a coke oven flue gas dust removal device, in which two ash discharge valves arranged up and down are installed on the ash hopper. When the valves are closed, the device has a higher sealing performance, and the two ash discharge valves work alternately, which can effectively improve the ash discharge efficiency.

[0024] (4) The utility model discloses a coke oven flue gas dust removal device, in which a vibration motor is fixedly installed on the side of the ash hopper. When the material level meter detects that the dust accumulated in the ash hopper reaches a certain height, the vibration motor is started to disperse the dust accumulated in the ash hopper to prevent the dust from agglomerating and blocking the ash discharge port. At the same time, a maintenance pipeline is installed on the side of the ash hopper to facilitate the staff to perform maintenance and troubleshooting when problems occur in the device, thereby ensuring the normal operation of the device.

[0025] (5) The utility model provides a coke oven flue gas dust removal device, in which a nitrogen inlet is installed on the top of the filter chamber. After the device has been working for a period of time, the membrane tube of the filter chamber can be purged with nitrogen to clean the dust adsorbed on the membrane tube filter element. By preheating the nitrogen, the fluidity of the nitrogen can be enhanced, thereby improving the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a front view structural diagram of the dust removal device of the utility model;

[0027] Figure 2 It is a side view structural schematic diagram of the dust removal device of the utility model;

[0028] Figure 3 This is a schematic diagram of the bottom installation structure of the membrane tube;

[0029] In the figure: 1. Filter chamber; 2. Ash hopper; 3. Flue gas inlet; 4. Flue gas outlet; 5. Hanging rod; 6. Positioning hole; 7. Positioning pin; 8. Ash discharge valve; 9. Vibrating motor; 10. Level meter; 11. Nitrogen inlet; 12. Maintenance pipeline; 13. Membrane tube. DETAILED DESCRIPTION

[0030] Exemplary embodiments of the present invention are described in detail below. Although these exemplary embodiments are described in sufficient detail to enable those skilled in the art to implement the present invention, it should be understood that other embodiments may be implemented and various changes may be made to the present invention without departing from the spirit and scope of the present invention. The more detailed description of the embodiments of the present invention below is not intended to limit the scope of the claimed present invention, but is merely for illustration and does not limit the description of the features and characteristics of the present invention, in order to propose the best way to perform the present invention, and is sufficient to enable those skilled in the art to implement the present invention. Therefore, the scope of the present invention is limited only by the appended claims.

[0031] Example 1

[0032] A coke oven flue gas dust removal device is used to remove particulate inclusions in the coke oven flue gas and reduce the pollution caused by the discharged coke oven flue gas to the environment. The specific structure and technical effects of the device are described in detail below.

[0033] like Figure 1 and Figure 2 As shown, the main structure of the device is a filter chamber 1 and an ash hopper 2 located below the filter chamber 1. The upper end of the ash hopper 2 is connected to the filter chamber, and the lower end is provided with an ash discharge port. A smoke inlet 3 is provided at the upper part of the side wall of the ash hopper 2 near the filter chamber 1, and a smoke outlet 4 is provided at the upper part of the side wall of the filter chamber 1. The filter chamber 1 is provided with membrane tubes 13 arranged vertically in an axial direction at intervals, and the membrane tubes 13 have ceramic filter elements.

[0034] When high-temperature flue gas enters the filter chamber 1 from the flue gas inlet 3 on the ash hopper 2, larger dust particles in the dust-containing gas will sink into the ash hopper 2 due to their own weight and collision, while finer dust will be adsorbed on the outer surface of the ceramic filter element. The gas purified by the filter element enters the upper part of the filter chamber and is discharged through the flue gas outlet 4, effectively reducing the pollution caused by coke oven flue gas to the environment.

[0035] When installing the membrane tube, Figure 3 As shown, a suspension rod 5 arranged vertically in the axial direction is installed on the top of the filter chamber 1, and a cross bar is connected to the bottom of the suspension rod 5. The upper end of the membrane tube 13 is connected to the top of the filter chamber 1 through a ceramic fiber gasket, and the lower end thereof has a positioning hole 6, and a positioning pin 7 matched with the positioning hole 6 is installed on the cross bar. The ceramic fiber gasket can realize the buffering fixation of the membrane tube, and the setting of the suspension rod 5 ensures that the membrane tube cannot shake during use, greatly reducing the probability of the membrane tube breaking due to shaking.

[0036] In addition, the ash hopper 2 is provided with an ash discharge valve 8, and in this embodiment, there are two ash discharge valves 8, which are respectively installed at the upper and lower parts of the ash hopper 2. The provision of the two ash discharge valves 8 enables the device to have a higher sealing performance when the valves are closed, and the two ash discharge valves 8 work alternately, which can effectively improve the ash discharge efficiency.

[0037] A vibration motor 9 is fixedly installed on the side of the ash hopper 2. At the same time, a material level meter 10 and a maintenance pipe 12 are installed on the side of the ash hopper 2. When the material level meter 10 detects that the dust accumulated in the ash hopper 2 reaches a certain height, the vibration motor 9 is started to evacuate the dust accumulated in the ash hopper 2 to prevent the dust from compacting and blocking the ash outlet. The maintenance pipe 12 can facilitate the staff to perform maintenance and troubleshooting when there is a problem with the device to ensure the normal operation of the device.

[0038] It is worth mentioning that a nitrogen inlet 11 is also installed on the top of the filter chamber 1, and the nitrogen inlet 11 is connected to a nitrogen source through a nitrogen delivery pipeline. In this embodiment, there are multiple nitrogen inlets 11, which are arranged at intervals on the top of the filter chamber 1, and a nitrogen preheater is installed on the nitrogen delivery pipeline. After the device has been working for a period of time, the membrane tube of the filter chamber can be purged with nitrogen to clean the dust adsorbed on the membrane tube filter element, and by preheating the nitrogen, the fluidity of the nitrogen can be enhanced, thereby improving the cleaning effect.

[0039] To sum up, a coke oven flue gas dust removal device in this embodiment is used in the existing coke oven flue gas activated coke desulfurization and denitrification process. After the existing process removes the harmful gases in the coke oven flue gas, it can achieve efficient removal of small-size particles and reduce the pollution caused by the discharged coke oven flue gas to the environment.

Claims

1. A coke oven flue gas dust removal device, comprising a filter chamber (1) and an ash hopper (2) located below the filter chamber (1), a flue gas inlet (3) being provided at an upper portion of a side wall of the ash hopper (2) near the filter chamber (1), and a flue gas outlet (4) being provided at an upper portion of a side wall of the filter chamber (1), characterized in that: Membrane tubes (13) arranged vertically in an axial direction are arranged at intervals in the filter chamber (1), and a ceramic filter element is provided in the membrane tube (13).

2. A coke oven flue gas dust removal device according to claim 1, characterized in that: A suspension rod (5) arranged axially and vertically is installed on the top of the filter chamber (1), and a cross bar is connected to the bottom of the suspension rod (5); the upper end of the membrane tube (13) is connected to the top of the filter chamber (1) through a ceramic fiber gasket, and the lower end thereof has a positioning hole (6), and a positioning pin (7) matched with the positioning hole (6) is installed on the cross bar.

3. A coke oven flue gas dust removal device according to claim 1, characterized in that: The ash hopper (2) is provided with an ash discharge valve (8).

4. A coke oven flue gas dust removal device according to claim 3, characterized in that: There are two ash discharge valves (8), which are respectively installed at the upper part and the lower part of the ash hopper (2).

5. A coke oven flue gas dust removal device according to claim 4, characterized in that: A vibration motor (9) is fixedly mounted on the side of the ash hopper (2).

6. A coke oven flue gas dust removal device according to claim 5, characterized in that: A material level meter (10) is installed on the side of the ash hopper (2).

7. A coke oven flue gas dust removal device according to claim 1, characterized in that: A nitrogen inlet (11) is installed on the top of the filter chamber (1), and the nitrogen inlet (11) is connected to an external nitrogen source through a nitrogen delivery pipeline.

8. A coke oven flue gas dust removal device according to claim 7, characterized in that: A nitrogen preheater is installed on the nitrogen delivery pipeline.

9. A coke oven flue gas dust removal device according to any one of claims 1 to 8, characterized in that: A maintenance pipe (12) is installed on the side of the ash hopper (2).

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