An integrated system for reverse suction ash removal and ash conveying in a submerged arc furnace

Abstract

This utility model discloses an integrated system for reverse suction cleaning and ash conveying in a submerged arc furnace, comprising a bag filter. The interior of the bag filter is divided into multiple chambers by partitions. Each chamber is equipped with a backflush port, an exhaust port, an inlet port, an ash hopper, an ash discharge pipe, and an ash discharge valve. The backflush port is connected to a backflush pipeline via a backflush valve. The backflush pipeline is connected to an air storage tank and a nitrogen storage tank via storage tank valves. This integrated system for reverse suction cleaning and ash conveying in a submerged arc furnace draws gas from the backflush air and nitrogen storage tanks and connects it to the ash conveying pipe. By controlling the chambers into which the gas enters, the gas is blown upwards from the bottom of the ash hopper, blowing up the accumulated ash inside the hopper, breaking the bridging effect, and solving the blockage problem.

Description

Technical Field

[0001] This utility model relates to the field of dust removal technology for tail gas of electric arc furnaces, specifically an integrated system for reverse suction cleaning and ash conveying of electric arc furnaces. Background Technology

[0002] The core difference between positive pressure bag filters and negative pressure bag filters lies in the internal pressure state of the dust collector (higher or lower than atmospheric pressure). This difference is determined by the relative position of the fan and the dust collector, and directly affects its structural layout, applicable scenarios, operating characteristics, etc.

[0003] In a positive pressure baghouse dust collector, the fan is located at the front end of the dust collector. Before the dust-laden gas enters the dust collector, the fan "forces" the dust-laden gas into the dust collector, making the internal pressure of the dust collector higher than atmospheric pressure (positive pressure state). In a negative pressure baghouse dust collector, the fan is located at the rear end of the dust collector. After the purified gas is discharged from the dust collector, the fan draws the dust-laden gas through the dust collector through a "drawing" action, and the internal pressure is lower than atmospheric pressure (negative pressure state).

[0004] The blockage in the ash discharge system of a baghouse dust collector is essentially due to the obstruction of dust flow in the ash hopper, ash discharge valve, and conveying pipeline. The core characteristics of dust from the tail gas of an electric arc furnace are: the composition is strongly correlated with the smelting product, the particles are fine (mostly 1-10μm), and some dust is flammable. Fine dust with a particle size <10μm, such as flour and cement powder, has poor flowability and is prone to bridging effect, leading to difficulty in ash discharge. Therefore, this application solves the problem of ash discharge blockage caused by bridging effect through technical improvement. Summary of the Invention

[0005] The purpose of this utility model is to provide an integrated system for reverse suction ash removal and ash conveying in a submerged arc furnace, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: An integrated reverse suction ash removal and conveying system for a submerged arc furnace includes a bag filter. The interior of the bag filter is divided into multiple chambers by partitions. Each chamber is equipped with a reverse air port, an exhaust port, an air inlet port, an ash hopper, an ash discharge pipe, and an ash discharge valve. The reverse air port is connected to a reverse air pipeline through a reverse air valve. The reverse air pipeline is connected to an air storage tank and a nitrogen storage tank through storage tank valves. The air storage tank and the nitrogen storage tank are equipped with air inlet valves. An ash discharge valve is installed at the ash outlet of the ash discharge pipe. A downward inclined pipe is installed on the ash discharge pipe, and the downward inclined pipe is connected to an ash conveying pipe. The ash conveying pipe is connected to the reverse air pipeline through a three-way valve.

[0007] As a further improvement of this utility model: a chamber inlet valve is installed on the air inlet port, and the air inlet ports are all connected to the exhaust gas pipeline. The exhaust gas inside the exhaust gas pipeline enters each chamber of the bag filter under the control of the chamber inlet valve.

[0008] As a further embodiment of this utility model: the air storage tank and nitrogen storage tank store compressed gas. The compressed gas, under the switching action of the backflush valve, sends compressed air or nitrogen into the backflush pipeline, and then to each chamber of the bag filter through the backflush pipeline. A backflush valve is provided between the backflush pipeline and each chamber of the bag filter, and the backflush valve controls which chamber the backflush gas enters.

[0009] As a further improvement of this utility model: the exhaust port is connected to the exhaust pipeline through an exhaust valve, and a fan is installed on the exhaust pipeline. The operation of the fan creates a negative pressure environment in each chamber of the bag filter for dust removal.

[0010] As a further improvement of this utility model: an air supply valve is installed on the lower inclined pipe, and a three-way valve controls the backflushing gas to be sent into the ash conveying pipe, and then sent into the designated chamber under the control of the air supply valve.

[0011] Compared with the prior art, the beneficial effects of this utility model are: This integrated reverse suction ash removal and conveying system for electric arc furnaces draws gas from the air and nitrogen storage tanks during the reverse blowing process and connects it to the ash conveying pipe. By controlling the chamber into which the gas enters, the gas is blown upwards from the bottom of the ash hopper, blowing up the accumulated ash inside the ash hopper, breaking the bridging effect, and solving the blockage problem. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a bag filter in an integrated reverse suction ash removal and ash conveying system for a submerged arc furnace. Figure 2 This is a schematic diagram of a reverse suction ash removal and ash conveying integrated system for an electric arc furnace.

[0013] In the diagram: 1. Baghouse dust collector; 2. Chamber inlet valve; 3. Inlet port; 4. Tail gas pipeline; 5. Backflush port; 6. Exhaust port; 7. Ash hopper; 8. Ash discharge pipe; 9. Ash discharge valve; 10. Ash conveying pipe; 11. Backflush pipeline; 12. Three-way valve; 13. Storage tank valve; 14. Air storage tank and nitrogen storage tank; 15. Inlet valve; 16. Exhaust pipeline; 17. Fan; 18. Exhaust valve; 19. Backflush valve; 20. Inclined pipe; 21. Gas conveying valve. Detailed Implementation

[0014] Please see Figure 1 and 2In this embodiment of the utility model, an integrated system for reverse suction cleaning and ash conveying of a submerged arc furnace includes a bag filter 1. The interior of the bag filter 1 is divided into multiple chambers by partitions. Each chamber is equipped with a reverse air port 5, an exhaust port 6, an air inlet port 3, an ash hopper 7, an ash discharge pipe 8, and an ash discharge valve 9. The reverse air port 5 is connected to a reverse air pipeline 11 via a reverse air valve 19. The reverse air pipeline 11 is connected to an air storage tank and a nitrogen storage tank 14 via a storage tank valve 13. The air storage tank and the nitrogen storage tank 14 are equipped with air inlet valves 15. An ash discharge valve 9 is installed at the ash outlet of the ash discharge pipe 8. A downward inclined pipe 20 is installed on the ash discharge pipe 8, and the downward inclined pipe 20 is connected to an ash conveying pipe 10. The ash conveying pipe 10 is connected to a three-way flow path. The valve 12 is connected to the backflush pipeline 11. By drawing out the gas from the backflush air tank and nitrogen tank 14, the gas is connected to the ash conveying pipe 10 and sent to each ash hopper 7 through the ash conveying pipe 10 for ash removal. After ash removal, the ash is conveyed to the bottom. During the ash removal process, the backflush air valve 19 of the corresponding chamber is closed and the exhaust valve 18 is opened. Compressed air or nitrogen enters the interior of the ash discharge pipe 8 through the downward inclined pipe 20. The ash discharge valve 9 is closed and compressed gas is injected from the bottom of the ash accumulation to blow upward to loosen the ash accumulation, break the bridging effect, and solve the blockage problem. The corresponding chamber is under positive pressure during ash removal. The gas is discharged normally from the exhaust pipeline 16 through the filter bag. The dust is filtered by the filter bag and returns to the ash hopper 7. The baghouse structure of the large-scale negative pressure baghouse dust collector for electric arc furnaces proposed in Chinese Patent Application No. 2025216009175, through the multi-chamber independent dust filtration working mode, can realize online back-blowing cleaning and bag replacement maintenance, and realize independent dust removal operation control. This application can be combined with the baghouse structure of the large-scale negative pressure baghouse dust collector for electric arc furnaces, so that the baghouse dust collector can independently perform ash removal, back-blowing, ash unloading, and ash conveying.

[0015] In a preferred embodiment, a chamber inlet valve 2 is installed on the air inlet port 3. All air inlet ports 3 are connected to the exhaust gas pipeline 4. The exhaust gas inside the exhaust gas pipeline 4 enters each chamber of the bag filter 1 under the control of the chamber inlet valve 2. The independent chamber structure can realize dust removal without stopping the machine. Combined with the dust removal method of this application, it can effectively avoid the problem of dust accumulation during backflushing forming a bridging effect and requiring manual dust removal.

[0016] In a preferred embodiment, compressed gas is stored in the air storage tank and nitrogen storage tank 14. The compressed gas, under the switching action of the backflush valve 19, sends either compressed air or nitrogen into the backflush pipeline 11, which then delivers it to each chamber of the bag filter 1. A backflush valve 19 is installed between the backflush pipeline 11 and each chamber of the bag filter 1, controlling which chamber the backflush gas enters. The flue gas may contain combustible substances such as CO (coal gas) and pulverized coal, or may contain high-temperature sparks. If only air is used for backflush, the oxygen in the air (21%) may mix with the combustible components, potentially causing an accident after reaching the combustion and explosion limit. Therefore, using a dual gas source of "nitrogen + air" requires valve control for switching, improving economic efficiency.

[0017] In a preferred embodiment, the exhaust port 6 is connected to the exhaust pipeline 16 via the exhaust valve 18. A fan 17 is installed on the exhaust pipeline 16. The operation of the fan 17 creates a negative pressure environment in each chamber of the bag filter 1 for dust removal.

[0018] In a preferred embodiment, an air supply valve 21 is installed on the downward inclined pipe 20, and a three-way valve 12 controls the backflush gas to be sent into the ash conveying pipe 10. Under the control of the air supply valve 21, the gas is sent into the designated chamber. The three-way valve 12 controls the gas inside the backflush pipeline 11 to be blown only to the backflush port 5 or to the ash hopper 7.

[0019] It should be noted that all the above embodiments belong to the same utility model concept, and the descriptions of each embodiment have different focuses. Where the description in a particular embodiment is not detailed, please refer to the description in other embodiments.

[0020] The embodiments described above merely illustrate the implementation of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An integrated system for reverse suction cleaning and ash conveying of a submerged arc furnace, comprising a bag filter (1), wherein the interior of the bag filter (1) is divided into multiple chambers by partitions, and each chamber is provided with a reverse blowing port (5), an exhaust port (6), an air inlet port (3), an ash hopper (7), an ash discharge pipe (8), and an ash discharge valve (9), characterized in that, The backflush port (5) is connected to the backflush pipeline (11) through the backflush valve (19). The backflush pipeline (11) is connected to the air storage tank and the nitrogen storage tank (14) through the storage tank valve (13). The air storage tank and the nitrogen storage tank (14) are equipped with air inlet valves (15). The ash outlet of the ash discharge pipe (8) is equipped with an ash discharge valve (9). The ash discharge pipe (8) is equipped with a downward inclined pipe (20). The downward inclined pipe (20) is connected to the ash conveying pipe (10). The ash conveying pipe (10) is connected to the backflush pipeline (11) through a three-way valve (12).

2. The integrated system for reverse suction ash removal and conveying of a submerged arc furnace according to claim 1, characterized in that, The air inlet port (3) is equipped with a chamber air inlet valve (2). The air inlet port (3) is connected to the tail gas pipeline (4). The tail gas inside the tail gas pipeline (4) enters each chamber of the bag filter (1) under the control of the chamber air inlet valve (2).

3. The integrated system for reverse suction ash removal and conveying of a submerged arc furnace according to claim 1, characterized in that, The air storage tank and nitrogen storage tank (14) store compressed gas. The compressed gas is switched by the backflush valve (19) to send compressed air or nitrogen into the backflush pipeline (11) and then sent to each chamber of the bag filter (1). A backflush valve (19) is provided between the backflush pipeline (11) and each chamber of the bag filter (1). The backflush valve (19) controls which chamber the backflush gas enters.

4. The integrated system for reverse suction ash removal and conveying of a submerged arc furnace according to claim 1, characterized in that, The exhaust port (6) is connected to the exhaust pipeline (16) through the exhaust valve (18). A fan (17) is installed on the exhaust pipeline (16). The operation of the fan (17) creates a negative pressure environment in each chamber of the bag filter (1) for dust removal.

5. The integrated system for reverse suction ash removal and conveying of a submerged arc furnace according to claim 1, characterized in that, A gas supply valve (21) is installed on the inclined pipe (20). A three-way valve (12) controls the backflush gas to be sent into the ash conveying pipe (10) and sent into the designated chamber under the control of the gas supply valve (21).

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