Dust collecting device for electric furnace smelting

Abstract

The utility model relates to the technical field of flue gas dedusting, specifically to a smelting dedusting and dust collecting device for electric furnace, which comprises an electric furnace, a high-temperature flue gas dedusting component, a furnace perimeter dedusting component, a top layer dedusting component, a dust collector, a dedusting fan and a chimney. The high-temperature flue gas dedusting component comprises a settling chamber, and the electric furnace is connected with the settling chamber through a horizontal flue. A plurality of cooling smoke baffle plates are arranged in the settling chamber, and a side dust absorption cover is arranged outside the horizontal flue. The furnace perimeter dedusting component comprises an electric furnace closed cover arranged above the electric furnace, a tapping dust absorption cover and a slag tapping dust absorption cover arranged on the side of the electric furnace. The top layer dedusting component comprises a roof cover, and an extension baffle mechanism is arranged on the roof cover. The utility model can realize efficient dust collecting and dedusting through three dedusting components, improve the settling effect of particulate matters in flue gas, add the tapping dust absorption cover and the slag tapping dust absorption cover to avoid flue gas diffusion, and improve the trapping efficiency of flue gas through the extension baffle mechanism and the roof cover, thereby improving the dedusting effect of flue gas.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas dust removal, in particular to a dust collection device for electric furnace smelting. Background Art

[0002] Each conventional baghouse dust removal system supporting an electric furnace steelmaking workshop consists of dust collecting hoods at various dust emission points, ventilation ducts, duct process valves, a dust collector and its pulse injection system, an ash conveying and discharging system, an induced draft system of a fan station, an exhaust funnel, an electrical automatic control system and other components, wherein the electric furnace dust removal system further comprises a settling chamber, a quench boiler and other systems. The process flow is as follows: flue gas and dust generated at each dust emission point, under the action of negative pressure of the induced draft system, enter the dust collection hood for collection, converge into the main air inlet duct through each branch duct, then enter the baghouse dust collector, separate the dust in the air flow under the filtering action of the filter bags, the purified gas is discharged from the air outlet of the dust collector, and is discharged into the atmosphere through the exhaust funnel after passing through the fan and the muffler.

[0003] For current electric furnace dust removal systems, there are the following technical problems: 1. The primary flue gas of the electric furnace has excessively high temperature and large dust content, which causes strong abrasion to conventional bent flue ducts, often resulting in elbow abrasion leakage or burning through due to high temperature, the settling effect of the electric furnace flue gas in the settling chamber is weak, causing serious ash deposition on the heat exchange tubes of the rear waste heat boiler; 2. Due to poor sealing performance at the horizontal feeding section, smoke and dust often overflow outward; 3. The secondary flue gas of the electric furnace is collected by a conventional doghouse hood, and during the steel tapping and slag discharging processes, the flue gas cannot be effectively collected, there is obvious visible dust in the plant, and the dust diffuses with cross wind in the upper space of the plant, which seriously affects the operating environment for posts; 4. The tertiary flue gas of the electric furnace is collected by a roof hood, which sucks in a large amount of ambient air and has too low dust collection efficiency, resulting in high energy consumption of the dust removal fan. Summary of the Utility Model

[0004] The objective of the utility model is to provide a dust collection device for electric furnace smelting, so as to improve the settling effect of particulate matter in flue gas, avoid flue gas escape, and overall improve the flue gas dust removal and collection effect.

[0005] To achieve the above objective, the utility model provides the following technical solution; A dust collection device for electric furnace smelting, comprising an electric furnace, a high-temperature flue gas dust removal assembly, a peripheral dust removal assembly, a top-layer dust removal assembly, a dust collector, a dust removal fan and a chimney; the high-temperature flue gas dust removal assembly comprises a settling chamber, the electric furnace is communicated with the settling chamber through a horizontal flue duct; a plurality of cooling smoke baffle plates are arranged in the settling chamber, and a side-absorption dust collection hood is arranged outside the horizontal flue duct; the peripheral dust removal assembly comprises an electric furnace closed hood arranged above the electric furnace, and a steel tapping dust collection hood and a slag discharging dust collection hood arranged at the side of the electric furnace; the top-layer dust removal assembly comprises a roof hood, and a telescopic baffle mechanism is arranged at the roof hood; During operation, the roof cover, side dust absorption cover, electric furnace sealed cover, steel tapping dust suction cover and slag tapping dust suction cover are all connected to the dust collector through flue gas channels. The dust collector is connected to the dust removal fan to provide suction power, and the dust removal fan is connected to the chimney to discharge the dust-removed flue gas.

[0006] Furthermore, a waste heat boiler is also provided in the settling chamber, and a membrane heat exchange wall is provided on the cooling smoke baffle and connected to the waste heat boiler.

[0007] Furthermore, the installation gap of the electric furnace sealing cover is provided with a rubber seal and a small air intake.

[0008] Furthermore, the flue gas passages at the roof cover, side dust absorption cover, electric furnace sealed cover, steel tapping dust collection cover, and slag tapping dust collection cover are all equipped with flue gas regulating valves.

[0009] Furthermore, a flue gas sensor is installed at the flue gas inlet of the steel tapping dust hood and the slag tapping dust hood, and the flue gas sensor is connected to the flue gas regulating valve of the corresponding flue gas duct of the steel tapping dust hood and the slag tapping dust hood.

[0010] Furthermore, each of the flue gas passages is equipped with a temperature and pressure sensor, which is connected to the flue gas regulating valve.

[0011] Furthermore, the telescopic baffle mechanism includes a telescopic drive device installed on the roof cover and a smoke baffle that is driven and connected to the actuating end of the telescopic drive device; during operation, the telescopic drive device drives the smoke baffle to descend in order to reduce crosswind interference.

[0012] Furthermore, the roof canopy is shaped like a wide-mouthed trumpet.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This electric furnace smelting dust removal and collection device achieves high-efficiency dust collection and removal through three sets of dust removal components. A horizontal flue avoids bends in the high-temperature dust-laden flue gas filling pipes. Multiple sets of cooling baffles in the settling chamber slow down and cool the high-temperature dust, improving the settling effect of particulate matter in the flue gas. Additional side-mounted steel tapping and slag tapping dust hoods enable the re-capture of escaping flue gas, preventing its dispersion. A telescopic baffle mechanism, in conjunction with the roof hood, prevents the upward diffusion of tertiary flue gas from being affected by heat flow and crosswinds above the plant, improving the capture efficiency of tertiary flue gas and enhancing the overall dust removal and collection effect. Attached Figure Description

[0014] Figure 1 This is a flowchart illustrating the present invention. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0016] refer to Figure 1 As shown, this utility model provides a dust removal and collection device for electric furnace smelting, including an electric furnace 17, a high-temperature flue gas dust removal component, a furnace perimeter dust removal component, a top-level dust removal component, a dust collector 7, a dust removal fan 9, and a chimney 8; the high-temperature flue gas dust removal component includes a settling chamber 12, and the electric furnace 17 is connected to the settling chamber 12 via a horizontal flue 11; the settling chamber 12 is provided with multiple cooling baffles 13, and the horizontal flue 11 is provided with a side-absorbing dust hood 14 outside; the furnace perimeter dust removal component includes an electric furnace sealed cover 2 disposed above the electric furnace 17 and a steel tapping dust suction hood 1 and a slag tapping dust suction hood 15 disposed on the side of the electric furnace 17; the top-level dust removal component includes a roof cover 4, and a telescopic baffle mechanism 3 is provided at the roof cover 4; During operation, the roof cover 4, the side dust absorption cover 14, the electric furnace sealed cover 2, the steel tapping dust suction cover 1, and the slag tapping dust suction cover 15 are all connected to the dust collector 7 through flue gas channels. The dust collector 7 is connected to the dust removal fan 9 to provide exhaust power. The dust removal fan 9 is connected to the chimney 8 to discharge the flue gas after dust removal.

[0017] Specifically, the high-temperature flue gas dust removal component, the furnace perimeter dust removal component, and the top-level dust removal component together form a three-stage dust removal system to achieve all-round, multi-directional dust collection and removal of electric furnace flue gas; the high-temperature flue gas generated by the electric furnace at 800-1200℃ enters the settling chamber 12 through the horizontal flue 11, and the settling chamber 12 is designed to be raised to match the height of the horizontal flue 11; the secondary flue gas generated by the electric furnace at no more than 120℃ is collected at the circuit sealing hood 2; and the flue gas is absorbed by the steel tapping dust hood 1 and the slag tapping dust hood 15 during the steel tapping and slag tapping stages; the tertiary flue gas generated by the electric furnace at 60-80℃ is captured by the roof hood 4 equipped with a telescopic baffle mechanism 3; This electric furnace smelting dust removal and collection device achieves high-efficiency dust collection and removal through three sets of dust removal components. The horizontal flue 11 avoids bends in the high-temperature dust-laden flue gas filling pipe. The settling chamber 12 has multiple sets of cooling baffles 13 to slow down and cool the high-temperature flue gas, improving the settling effect of particulate matter in the flue gas. The addition of a side-mounted steel tapping dust hood 1 and a slag tapping dust hood 15 enables the re-capture of the escaping flue gas, preventing flue gas from escaping. The telescopic baffle mechanism 3, in conjunction with the roof hood 4, prevents the upward diffusion of the tertiary flue gas from being affected by the heat flow and crosswinds above the plant, improving the capture efficiency of the tertiary flue gas and enhancing the overall dust removal and collection effect.

[0018] In this embodiment, a waste heat boiler 10 is also installed in the settling chamber 12, and a membrane heat exchange wall is installed on the cooling baffle 13 and connected to the waste heat boiler 10. Specifically, the membrane heat exchange wall on the cooling baffle 13 is connected to the evaporator system of the waste heat boiler 10, which can fully recover the radiant heat of the flue gas and increase the output of the waste heat recovery system; at the same time, the presence of the cooling baffle 13 can lengthen the flow path of the flue gas and separate large dust particles, thereby improving the dust removal effect of the settling chamber 12.

[0019] In this embodiment, a rubber seal and a small air intake are provided at the installation gap of the electric furnace sealing hood 2 to ensure the airtightness of the fume hood and prevent smoke and dust from escaping.

[0020] In this embodiment, the flue gas passages at the roof cover 4, side dust absorption hood 14, electric furnace sealed hood 2, steel tapping dust hood 1, and slag tapping dust hood 15 are all equipped with flue gas regulating valves 5. In this embodiment, flue gas sensors 16 are installed at the flue gas inlets of the steel tapping dust hood 1 and the slag tapping dust hood 15, and the flue gas sensors 16 are signal-connected to the corresponding flue gas regulating valves 5 of the steel tapping dust hood 1 and the slag tapping dust hood 15. In this embodiment, each flue gas passage is equipped with a temperature and pressure sensor 6, and the temperature and pressure sensor 6 is signal-connected to the flue gas regulating valve 5.

[0021] Specifically, the flue gas sensor 16 can detect whether there is any escaping dust that the electric furnace sealing hood 2 cannot capture during the slag and steel tapping stages. It can also control the opening and closing of the flue through the flue gas regulating valve 5 on the flue gas channel 5, ensuring that the secondary flue gas of the electric furnace can be effectively captured and reducing the escape of flue gas. With the help of multiple temperature and pressure sensors 6 and flue gas regulating valve 5, the operator can flexibly adjust the passage of the flue gas channel according to the actual production situation, reduce the operating power of the dust removal fan 9 in the overall dust removal device, and greatly reduce the power consumption of the device while ensuring that the plant can fully capture the flue gas.

[0022] In this embodiment, the telescopic baffle mechanism 3 includes a telescopic drive device installed on the roof cover 4 and a smoke baffle that is driven and connected to the execution end of the telescopic drive device; during operation, the telescopic drive device drives the smoke baffle to descend in order to reduce crosswind interference.

[0023] Specifically, the telescopic drive device can be an electrically driven telescopic cylinder. When the electric furnace is working, the telescopic drive device drives the smoke baffle to descend, allowing the tertiary flue gas to diffuse upwards into the roof cover 4, avoiding interference from crosswinds and hot air flow on the top of the plant with the flue gas collection work, and improving the overall flue gas collection efficiency.

[0024] In this embodiment, the roof cover 4 is shaped like a wide-mouthed trumpet.

[0025] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the scope defined by the spirit of this utility model.

Claims

1. A dust removal and collection device for electric furnace smelting, characterized in that, It includes an electric furnace (17), a high-temperature flue gas dust removal assembly, a furnace perimeter dust removal assembly, a top-level dust removal assembly, a dust collector (7), a dust removal fan (9), and a chimney (8); the high-temperature flue gas dust removal assembly includes a settling chamber (12), and the electric furnace (17) is connected to the settling chamber (12) via a horizontal flue (11); the settling chamber (12) is provided with multiple cooling baffles (13), and the horizontal flue (11) is provided with a side-absorbing dust hood (14) outside; The furnace perimeter dust removal assembly includes an electric furnace sealed cover (2) disposed above the electric furnace (17) and a steel tapping dust suction cover (1) and a slag tapping dust suction cover (15) disposed on the side of the electric furnace (17); the top-level dust removal assembly includes a roof cover (4), and a telescopic baffle mechanism (3) is provided at the roof cover (4). During operation, the roof cover (4), side dust absorption cover (14), electric furnace sealed cover (2), steel tapping dust suction cover (1) and slag tapping dust suction cover (15) are all connected to the dust collector (7) through flue gas channels. The dust collector (7) is connected to the dust removal fan (9) to provide exhaust power. The dust removal fan (9) is connected to the chimney (8) to discharge the flue gas after dust removal.

2. The dust removal and collection device for electric furnace smelting according to claim 1, characterized in that, A waste heat boiler (10) is also provided in the settling chamber (12), and a membrane heat exchange wall is provided on the cooling baffle plate (13) and connected to the waste heat boiler (10).

3. The dust removal and collection device for electric furnace smelting according to claim 2, characterized in that, The electric furnace enclosure (2) is equipped with a rubber seal and a small air intake at the installation gap.

4. The dust removal and collection device for electric furnace smelting according to claim 1, characterized in that, The flue gas passages at the roof cover (4), side dust absorption cover (14), electric furnace sealed cover (2), steel tapping dust suction cover (1) and slag tapping dust suction cover (15) are all equipped with flue gas regulating valves (5).

5. The dust removal and collection device for electric furnace smelting according to claim 4, characterized in that, A flue gas sensor (16) is provided at the flue gas inlet of the steel discharge dust hood (1) and the slag discharge dust hood (15). The flue gas sensor (16) is connected to the flue gas regulating valve (5) of the corresponding flue gas of the steel discharge dust hood (1) and the slag discharge dust hood (15).

6. The dust removal and collection device for electric furnace smelting according to claim 4, characterized in that, Each of the flue gas passages is equipped with a temperature and pressure sensor (6), which is connected to the flue gas regulating valve (5).

7. The dust removal and collection device for electric furnace smelting according to claim 1, characterized in that, The telescopic baffle mechanism (3) includes a telescopic drive device installed on the roof cover (4) and a smoke baffle that is driven and connected to the execution end of the telescopic drive device; during operation, the telescopic drive device drives the smoke baffle to descend in order to reduce crosswind interference.

8. The dust removal and collection device for electric furnace smelting according to claim 7, characterized in that, The roof cover (4) is shaped like a wide-mouthed trumpet.

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