Device for protecting filter cartridge and cloth bag

Abstract

The utility model relates to a device for protecting a filter cartridge and a cloth bag, which comprises a secondary dust removal pipeline and a spray gun, the secondary dust removal pipeline is connected with a dust remover, and the spray gun is connected to the top of the secondary dust removal pipeline; the spray gun comprises a body, a nozzle, a compressed air pipeline, a water pressure-resistant pipeline and a connecting hose, the compressed air pipeline and the water pressure-resistant pipeline are respectively connected with the body through the connecting hose, the end part of the body is connected with the nozzle, and the nozzle is arranged at the top of the secondary dust removal pipeline. The utility model has the advantages that the flue gas entering the dust remover can be cooled, the burning loss of the cloth bag and the filter cartridge equipment is avoided, and the normal service life of the cloth bag and the filter cartridge equipment is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of secondary dust removal in converters, and particularly relates to a device for protecting filter cartridges and cloth bags. Background Technology

[0002] With the widespread application of carbon-neutral steelmaking dust removal systems, most secondary dust collectors in converters employ bag filters or cartridge filters, which effectively filter dust, meeting the national environmental standard of 10mg. However, bag filters and cartridge filters generally have low heat resistance; filter bags typically have a heat resistance of ≤250℃, and cartridges typically have a heat resistance of ≤130℃. In the event of a converter production malfunction, this can easily lead to damage to the filter bags or cartridges, potentially causing environmental accidents and converter shutdowns. Therefore, a device is needed to cool the filter bags or cartridges and prevent damage. Summary of the Invention

[0003] To overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a device for protecting filter cartridges and filter bags, thereby reducing the occurrence of accidents caused by the dust collector temperature rising instantaneously due to abnormal conditions during converter production, which could burn the filter bags and filter cartridges.

[0004] To achieve the above objectives, this utility model employs the following technical solution:

[0005] A device for protecting filter cartridges and filter bags includes a secondary dust removal pipe and a spray gun. The secondary dust removal pipe is connected to a dust collector, and the spray gun is connected to the top of the secondary dust removal pipe.

[0006] The spray gun includes a body, a nozzle, a compressed air pipe, a water pressure-resistant pipe, and a connecting hose. The compressed air pipe and the water pressure-resistant pipe are respectively connected to the body through the connecting hose. The end of the body is connected to the nozzle, and the nozzle is located at the top of the secondary dust removal pipe.

[0007] The angle between the nozzle's blowing direction and the secondary dust removal pipe is an acute angle.

[0008] The secondary dust removal pipes are installed on both sides of the secondary smoke box of the converter.

[0009] The diameter of the secondary dust removal pipe is 2200-3200mm.

[0010] Valves are connected to both the compressed air pipeline and the water pressure-resistant pipeline.

[0011] The number of spray guns is five or more.

[0012] The secondary dust removal pipe is connected to a thermocouple.

[0013] The secondary dust removal pipe is connected to the main body via a flange.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. The device for protecting the filter cartridges and bags can cool the flue gas entering the dust collector, prevent the filter bags and cartridges from burning, and ensure the normal service life of the filter bags and cartridges.

[0016] 2. The device for protecting the filter cartridges and bags uses two pipelines to supply gas and water to the nozzles respectively, and the amount of gas supplied to the secondary dust removal pipeline is regulated by valves to cool the flue gas in the secondary dust removal pipeline. This reduces the risk of sudden temperature rise in the dust collector due to abnormal conditions during converter production, which could burn the filter bags and cartridges, cause environmental accidents, and lead to major hazards such as converter shutdown.

[0017] 3. The device for protecting the filter cartridges and bags can be equipped with multiple spray guns according to the length of the secondary dust removal pipeline. This ensures that if the dust collector temperature rises suddenly due to abnormal conditions in converter production, it can be cooled down quickly to avoid damage to the filter bags and filter cartridges. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] In the diagram: 1-Water pressure-resistant pipe 2-Compressed air pipe 3-Connecting hose 4-Valve 5-Body 6-Nozzle 7-Secondary dust removal pipe 8-Flange. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings. However, it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0021] See Figure 1 A device for protecting filter cartridges and bags includes a secondary dust collection pipe 7 and a spray gun. The secondary dust collection pipe 7 is connected to a dust collector, and the spray gun is connected to the top of the secondary dust collection pipe 7. The secondary dust collection pipe 7 collects the flue gas generated during converter iron charging and scrap steel addition, and transports it to the dust collector. Valves 4 are connected to both the compressed air pipe 2 and the water pressure-resistant pipe 1. The valves 4 can be solenoid valves. Compressed air (0.4-0.6 MPa) is supplied by the air compressor station to the compressed air pipe 2, and clean circulating water from the plant is supplied to the water pressure-resistant pipe 1 at a pressure of 0.2-0.3 MPa.

[0022] The spray gun includes a body 5, a nozzle 6, a compressed air pipe 2, a water pressure-resistant pipe 1, and a connecting hose 3. The compressed air pipe 2 and the water pressure-resistant pipe 1 are connected to the body 5 via the connecting hose 3. The end of the body 5 is connected to the nozzle 6, which is located at the top inside the secondary dust removal pipe 7. The connecting hose 3 is a metal flexible hose. The body 5 and the secondary dust removal pipe 7 are connected by a flange 8, which is bolted to the body 5. A short pipe is welded between the flange 8 and the secondary dust removal pipe 7, and the short pipe is connected to the flange 8. The nozzle 6 is fixedly connected to the body 5. Using the flange 8 to connect the body facilitates inspection and maintenance.

[0023] The angle between the spray direction of nozzle 6 and the secondary dust removal pipe 7 is acute, preferably 55°. Compressed air and water are mixed inside nozzle 6 to produce a uniform, fine spray, which enters the secondary dust removal pipe 7 at a certain angle to the flue gas flow direction. The atomized fine water mist particles combine with the high-temperature flue gas, rapidly evaporate, and carry away heat, causing the flue gas temperature to drop quickly and preventing excessively high flue gas temperatures from entering the dust collector.

[0024] There are more than 5 spray guns. Based on factors such as the distance from the dust collector to the site and the diameter of the secondary dust collection pipe 7, 6 spray guns are evenly distributed in the secondary dust collection pipe 7.

[0025] The diameter of the secondary dust removal duct 7 is 2200-3200mm. The secondary dust removal duct 7 is installed on both sides of the secondary smoke box of the converter, and the secondary dust removal duct 7 is 120m away from the dust collector inlet, providing an effective distance for cooling the flue gas at the dust collector inlet.

[0026] At least two thermocouples are connected to the secondary dust removal duct 7 to detect the temperature of the flue gas inside the duct in this area. At least one thermocouple is installed near the converter and another is installed near the dust collector in the secondary dust removal duct 7.

[0027] Spray guns one through six are connected sequentially from the converter to the dust collector, and thermocouples are installed at the connection points between the spray guns and the secondary dust collection pipe 7, with the temperatures detected being T1 through T6 respectively. When the device protecting the filter cartridges and bags is in operation, an alarm is triggered when the dust collector inlet temperature exceeds 100°C; when the dust collector inlet temperature exceeds 120°C, a gas-liquid mixture is injected into the secondary dust collection pipe 7.

[0028] When either temperature T1 or T2 is greater than 150℃ and temperature T3 is less than 110℃, open the valve 4 of the corresponding compressed air pipeline 2 and water pressure-resistant pipeline 1 of spray gun 1 and spray gun 2. When either temperature T1 or T2 is less than 150℃, close spray gun 1 and spray gun 2.

[0029] When either T1 or T2 exceeds 250℃, spray gun five is turned on (the other spray guns are turned off); when the dust collector inlet temperature is less than 160℃, spray gun five is turned off.

[0030] When either T1 or T2 exceeds 350℃, spray gun 6 is turned on (the other spray guns are turned off); when the dust collector inlet temperature is less than 170℃, spray gun 6 is turned off.

[0031] When any one of the temperatures T1 and T2 is greater than 450℃, turn on spray guns three and four (do not turn on the other spray guns); when any one of the temperatures T1, T2, and T3 is less than 300℃, turn off spray guns three and four.

[0032] When either temperature T1 or T2 exceeds 500℃, spray guns 1 and 2 are turned on, while the other spray guns remain off. When any two of temperatures T1, T2, and T3 are below 300℃, spray guns 1 and 2 are turned off.

[0033] After the device protecting the filter cartridges and bags was put into use, the secondary system of the converter operated smoothly. Since the modification, there has been no phenomenon of filter cartridge burn-out, which greatly reduces the risk of environmental accidents in the converter.

Claims

1. A device for protecting filter cartridges and bags, characterized in that, The secondary dust removal pipeline is connected with a dust remover, and the spray gun is connected at the top of the secondary dust removal pipeline. The spray gun comprises a body, a nozzle, a compressed air pipeline, a water pressure-resistant pipeline and connecting hoses.

2. The device for protecting filter cartridges and bags according to claim 1, characterized in that, The spray nozzle is arranged at the top of the secondary dust removal pipeline.

3. The device for protecting filter cartridges and bags according to claim 1, characterized in that, The secondary dust removal pipeline is arranged on both sides of the secondary smoke box of the converter.

4. The device for protecting filter cartridges and bags according to claim 1, characterized in that, The diameter of the secondary dust removal pipeline is 2200-3200 mm.

5. The device for protecting filter cartridges and bags according to claim 1, characterized in that, Valves are connected to the compressed air pipeline and the water pressure-resistant pipeline.

6. The device for protecting filter cartridges and bags according to claim 1, characterized in that, The spray gun is more than 5.

7. The device for protecting filter cartridges and bags according to claim 1, characterized in that, A thermocouple is connected to the secondary dust removal pipeline.

8. The device for protecting filter cartridges and bags according to claim 1, characterized in that, The secondary dust removal pipeline and the body are connected by flanges.

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