High-temperature metal filter bag dust removal device of nickel dilution electric furnace

Abstract

The utility model relates to the technical field of high-temperature flue gas dust removal, in particular to a high-temperature metal filter bag dust removal device for a nickel dilution electric furnace, and aims to solve the problems of low dust collection efficiency and high outlet dust concentration of the dilution electric furnace caused by low adaptability of an existing electrostatic dust collector to flue gas dust and temperature change of the dilution electric furnace. The amount of acid water and acid mud in the purification process of the acid making system is increased, and the equipment failure rate is high. The device comprises a metal filter bag dust collector body, a high-temperature flue gas inlet flue is installed on the metal filter bag dust collector body, a comprehensive forced cooling device is arranged in the middle of the high-temperature flue gas inlet flue, stainless steel flues are all embedded in disc chuck holes, and a water cooling device is installed on the flue gas inlet flue and mainly used for cooling high-temperature flue gas. The metal filter bag is prevented from being burnt by high-temperature flue gas; meanwhile, the emergency bypass flue is installed on the side face of the air inlet flue, the metal filter bag dust removal device and metal filter materials of the dust removal device are convenient to overhaul, and the purposes of high filter precision, high air permeability, high-temperature corrosion resistance, mechanical vibration resistance and the like are achieved.

Description

Technical Field

[0001] This utility model relates to the field of high-temperature flue gas dust removal technology, specifically to a high-temperature metal filter bag dust removal device for nickel depletion electric furnaces. Background Technology

[0002] The diverse types of materials fed into nickel-slack electric arc furnaces result in flue gas with unique properties such as high resistivity, low bulk density, and fine particle size. Electrostatic precipitators (ESPs) struggle to efficiently capture this dust, leading to low dust removal efficiency and severely impacting the safe and stable operation of the downstream acid production system. Given the limited adaptability of ESPs to changes in dust content and temperature in the flue gas from nickel-slack electric arc furnaces, resulting in low dust collection efficiency, high outlet dust concentrations, increased acid water and sludge production in the acid production system's purification process, and high equipment failure rates, there is an urgent need to further optimize the dust removal device for the flue gas from nickel-slack electric arc furnaces. Utility Model Content

[0003] This invention provides a high-temperature metal filter bag dust removal device for nickel depletion electric furnaces to solve the problems mentioned above.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A high-temperature metal filter bag dust removal device for a nickel depletion electric furnace includes an inlet flue, which is connected to an integrated forced cooling device. The integrated forced cooling device is connected to the main body of the dust removal device, and an emergency bypass flue is also connected between the output end of the main body of the dust removal device and the integrated forced cooling device.

[0006] Furthermore, the main body of the dust removal device includes a gravity settling zone, which is connected to a diversion zone, which is connected to a metal filter bag zone, and the metal filter bag zone is connected to the emergency bypass flue.

[0007] Furthermore, the integrated forced cooling device includes a frame, on which multiple heat exchange flues are vertically arranged, and water channels are provided inside the heat exchange flues. The frame is connected to the air inlet flue.

[0008] Furthermore, one end of the waterway is connected to an inlet pipe, and the other end of the waterway is connected to an outlet pipe.

[0009] Furthermore, flower plates are connected to both the top and bottom sides of the heat exchange flue.

[0010] This utility model has the following beneficial effects:

[0011] This utility model provides a high-temperature metal filter bag dust collection device for nickel depletion electric furnaces, comprising a metal filter bag dust collector body, a high-temperature flue gas inlet duct installed on the metal filter bag dust collector, a comprehensive forced cooling device in the middle of the high-temperature flue gas inlet duct, stainless steel flues embedded in the perforated disc, and a water cooling device installed on the inlet duct, mainly for cooling and reducing the temperature of the high-temperature flue gas to prevent the high-temperature flue gas from burning the metal filter bags; at the same time, an emergency bypass duct is installed on the side of the inlet duct for convenient maintenance of the metal filter bag dust collection device. The metal filter material of the dust collection device achieves high filtration accuracy, high air permeability, high temperature corrosion resistance, and resistance to mechanical vibration, solving the problems of poor adaptability of current electrostatic precipitators to dust and temperature changes in depletion electric furnace flue gas, resulting in low dust collection efficiency and high dust concentration at the outlet of the depletion electric furnace, leading to increased acid water and acid sludge in the acid production system purification process and high equipment failure rate.

[0012] In this invention, the integrated forced cooling device is installed in the middle of the air intake flue to cool down the flue gas from the depleted electric furnace, effectively preventing the high-temperature flue gas from damaging the metal filter material.

[0013] In this utility model, an emergency bypass flue is installed on the side of the dust collection device's inlet flue, which facilitates the maintenance of the dust collection device.

[0014] The main function of the gravity settling zone and the diversion zone in this invention is to pre-remove 30% of the large particulate dust through gravity settling, and then to treat the flue gas in the diversion zone to make the flue gas flow evenly into the metal filter bag area for filtration and dust removal.

[0015] In this invention, the metal filter material in the metal filter bag area is an iron-aluminum alloy, which has the characteristics of high filtration accuracy, high porosity, high air permeability, high temperature resistance, corrosion resistance, airflow impact resistance, and mechanical vibration resistance. It is suitable for high-efficiency dust removal of high-temperature flue gas. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the internal structure of the integrated forced cooling device of this utility model.

[0018] The meanings of the reference numerals in the attached figures are as follows:

[0019] 1. Inlet flue; 2. Integrated forced cooling device; 3. Gravity settling zone; 4. Diversion zone; 5. Metal filter bag zone; 6. Main body of dust removal device; 7. Emergency bypass flue; 8. Frame; 9. Water channel; 10. Water inlet pipe; 11. Water outlet pipe; 12. Heat exchange flue; 13. Flower plate. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1-2 As shown, a high-temperature metal filter bag dust removal device for a nickel depletion electric furnace includes an inlet flue 1, an integrated forced cooling device 2 connected to the inlet flue 1, the integrated forced cooling device 2 connected to the dust removal device body 6, and an emergency bypass flue 7 connected between the output end of the dust removal device body 6 and the integrated forced cooling device 2.

[0022] The main body 6 of the dust removal device includes a gravity settling zone 3, which is connected to a diversion zone 4. The diversion zone 4 is connected to a metal filter bag zone 5, and the metal filter bag zone 5 is connected to the emergency bypass flue 7.

[0023] The integrated forced cooling device 2 includes a frame 8, on which multiple heat exchange flues 12 are vertically arranged, and water channels 9 are provided inside the heat exchange flues 12. The frame 8 is connected to the air intake flue 1.

[0024] One end of the waterway 9 is connected to the inlet pipe 10, and the other end of the waterway 9 is connected to the outlet pipe 11.

[0025] Flower plates 13 are connected to both the top and bottom sides of the heat exchange flue 12.

[0026] The frame 8 is installed in the middle of the air intake flue 1 and is welded to the flue through the inlet and outlet fume hoods. The flower plate 13 is installed at the upper and lower ends of the frame 8 and is welded to the frame 8.

[0027] Four stainless steel heat exchange flues 12 are embedded in the holes of the flower plate 13. Water channels 9 are welded to the outer wall of the stainless steel heat exchange flues 12. Water inlet pipe 10 and water outlet pipe 11 are connected to the threaded pipes of water channel 9. The gap between the stainless steel heat exchange flues 12 and the flower plate 13 is sealed with sealing cotton. Two axial flow fans are arranged in a layer on one side of the stainless steel heat exchange flues 12.

[0028] In practical use, the high-temperature flue gas is first evenly dispersed into the four stainless steel heat exchange flues 12 of the integrated forced cooling device 2. Cooling water entering the water channel 9 through the inlet pipe 10 exchanges heat with the hot flue gas, thus cooling it down. If the cooling water fails to reach the required temperature for the flue gas to enter the dust collector, an interlock is set up to sequentially activate the axial flow fans on each layer according to the flue gas temperature. The airflow generated by the rotating impellers of the axial flow fans simultaneously cools the hot flue gas with the cooling water. The cooled flue gas then enters the gravity settling zone 3 at the front end of the main body 6 of the dust collector. The flue gas is preheated in the gravity settling zone 3. After dust removal, the gas enters the diversion zone 4. Under the action of the airflow distribution plate, the gas flows evenly into the metal filter bag zone 5 at the rear end. The filter material in the metal filter bag zone 5 is made of iron-aluminum alloy, which has the characteristics of high filtration accuracy, high porosity, high air permeability, high temperature resistance and corrosion resistance. It can effectively solve the problem of low dust removal efficiency of the original electrostatic precipitator. The integrated forced cooling device 2 effectively cools down the high temperature flue gas, thereby reducing the risk of high temperature flue gas burning the metal filter bag and ensuring the efficient operation of the dust removal system. In addition, the use of metal filter material effectively improves the dust removal efficiency of high temperature flue gas and reduces the operating pressure of the downstream acid production system. Therefore, this device has good practicality.

Claims

1. A nickel depleted electric furnace high temperature metal baghouse precipitator comprising an inlet flue (1) characterised in that: The intake flue (1) is connected to a comprehensive forced cooling device (2), which is connected to the dust removal device body (6). An emergency bypass flue (7) is also connected between the output end of the dust removal device body (6) and the comprehensive forced cooling device (2).

2. A nickel depleted electric furnace high temperature metal baghouse dedusting device according to claim 1, characterized in that: The main body (6) of the dust removal device includes a gravity settling zone (3), which is connected to a diversion zone (4), which is connected to a metal filter bag zone (5), and the metal filter bag zone (5) is connected to the emergency bypass flue (7).

3. A nickel depleted electric furnace high temperature metal filter bag precipitator according to claim 1, characterized in that: The integrated forced cooling device (2) includes a frame (8), on which multiple heat exchange flues (12) are vertically arranged, and water channels (9) are provided inside the heat exchange flues (12), and the frame (8) and the air intake flue (1) are connected.

4. A nickel depleted electric furnace high temperature metal baghouse dedusting device according to claim 3, characterized in that: One end of the waterway (9) is connected to an inlet pipe (10), and the other end of the waterway (9) is connected to an outlet pipe (11).

5. A nickel depleted electric furnace high temperature metal filter bag precipitator according to claim 3, characterized in that: The heat exchange flue (12) is connected to flower plates (13) on both the top and bottom sides.

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