Efficient powder spraying device for metal refining

Abstract

The invention relates to the field of metal refining, in particular to an efficient powder spraying device for metal refining, the efficient powder spraying device for metal refining comprises a support, a carbon powder tank, a discharging pipe, a main blowing pipeline and a spray gun, the spray gun is arranged at the bottom of an electric arc furnace and fixedly connected with a bottom blowing brick, and the support is fixed to a working face; the carbon powder tank is fixed in the support and used for loading carbon powder, the discharging pipe is fixedly connected and communicated with the carbon powder tank, one end of the main blowing pipeline is connected and communicated with an air source, the other end of the main blowing pipeline is fixedly connected and communicated with the spray gun, an ejector is fixedly connected in the main blowing pipeline, and the discharging pipe is fixedly connected and communicated with the ejector. The main blowing pipeline is used for conveying high-flow-speed airflow, the ejector is used for conveying the carbon powder in the discharging pipe to the main blowing pipeline, and the effects of improving the utilization rate of the carbon powder and reducing the smelting cost are achieved.

Description

Technical Field

[0001] The present application relates to the field of metal refining, and in particular to a high-efficiency powder spraying device for metal refining. Background Art

[0002] At present, my country's short-process electric arc furnace steelmaking technology has been widely promoted in various places. Short-process electric arc furnace steelmaking is an efficient steelmaking method that uses scrap steel as the main raw material, melts scrap steel through electric arc heating, and uses oxygen blowing, carbon injection, slag making and other processes to remove impurities (such as phosphorus and sulfur) and adjust the composition of molten steel. Compared with traditional long-process steelmaking, the short process has significant advantages such as low energy consumption, low carbon emissions, and flexible production. It has become one of the core processes for the green and low-carbon transformation of the steel industry.

[0003] In the existing short-process electric arc furnace steelmaking process, carbon addition technology is one of the key means to regulate the metallurgical reaction of the molten pool: by adding carbon materials into the molten pool, carbon reacts with oxygen in the molten pool to generate CO gas, which can play the following roles: ① Stirring the molten pool: CO bubbles float up to drive the flow of molten steel, promoting the uniformity of composition and temperature; ② Providing heat: The carbon-oxygen reaction releases heat, which can increase the furnace temperature to meet the needs of scrap melting and refining; ③ Dephosphorization and desulfurization: The reducing atmosphere generated by the carbon-oxygen reaction can inhibit the formation of FeO. At the same time, carbon, as a strong reducing agent, can reduce phosphorus and sulfur oxides in the molten steel, thereby improving the purity of the molten steel.

[0004] The above-mentioned prior art solutions have the following defects: currently, carbonization of molten steel is generally performed by spraying powder into the molten steel from above the slag layer. Since the carbonaceous material has a light specific gravity, it can only float on the slag layer and it is difficult to contact the molten steel through the slag layer, so the utilization rate of the carbon powder is relatively low. Summary of the invention

[0005] In order to improve the utilization rate of carbon powder and reduce smelting costs, the present application provides a high-efficiency powder spraying device for metal refining.

[0006] The above technical objectives of this application are achieved through the following technical solutions: A high-efficiency powder spraying device for metal refining comprises a bracket, a carbon powder tank, a feed pipe, a main blowing pipeline and a spray gun, wherein the spray gun is arranged at the bottom of an electric arc furnace and fixedly connected to a bottom blowing brick, the bracket is fixed on a working surface, the carbon powder tank is fixed in the bracket, the carbon powder tank is used to load carbon powder, the feed pipe is fixedly connected and communicated with the carbon powder tank, one end of the main blowing pipeline is connected and communicated with an air source, and the other end is fixedly connected and communicated with the spray gun, an injector is fixedly connected in the main blowing pipeline, the feed pipe is fixedly connected and communicated with the injector, the main blowing pipeline is used to convey a high-velocity airflow, and the injector is used to deliver the carbon powder in the feed pipe to the main blowing pipeline.

[0007] Further, the toner cartridge is further provided with a fluidization pipeline. One end of the fluidization pipeline is connected and communicated with a gas source, and the other end is fixedly connected and communicated with the bottom of the toner cartridge. The fluidization pipeline is used for fluidizing the toner.

[0008] Further, the fluidization pipeline includes a fluidization pipe, a gas distribution ring and a spray pipe. The fluidization pipe is connected to the gas source. The gas distribution ring is sleeved outside the toner cartridge. A plurality of spray pipes are provided. Two ends of each spray pipe are respectively fixedly connected and communicated with the gas distribution ring and the toner cartridge. The gas distribution ring is fixedly connected and communicated with the fluidization pipe.

[0009] Further, the toner cartridge is further provided with a pressurization pipeline. The pressurization pipeline includes a pressurization pipe. One end of the pressurization pipe is connected to the gas source, and the other end is fixedly connected and communicated with the top end of the toner cartridge. The pressurization pipe is used for conveying compressed gas into the toner cartridge to ensure stable output of the toner.

[0010] Further, a feed bin is arranged above the toner cartridge. The feed bin is fixedly connected to a bracket, and is fixedly connected and communicated with the toner cartridge. The feed bin is used for conveying toner into the toner cartridge.

[0011] Further, the feed bin is provided with a gas supply pipeline. The gas supply pipeline includes a gas supply pipe. One end of the gas supply pipe is connected to the gas source, and the other end is fixedly connected and communicated with the feed bin. The gas supply pipeline is used for assisting the feed bin to add toner into the toner cartridge.

[0012] Further, a recovery pipe is arranged between the gas supply pipe and the spray gun. A powder suction pipe is arranged on the spray gun. The powder suction pipe is used for recovering the residual toner in the spray gun. A Venturi tube is fixedly connected to the gas supply pipe. One end of the recovery pipe is fixedly connected and communicated with the constriction of the Venturi tube, and the other end is fixedly connected and communicated with the powder suction pipe.

[0013] Further, the spray gun includes a gun body and a powder spraying pipe. A toner bin is arranged at one end of the gun body close to the main blowing pipeline. The main blowing pipeline is communicated with the toner bin. A plurality of powder spraying pipes are provided. Each powder spraying pipe is arranged in the gun body and is fixedly connected to the gun body. One end of the powder spraying pipe is communicated with the toner bin, and the other end passes through the end face of the spray gun far from the main blowing pipeline. The powder spraying pipe is used for conveying the toner in the toner bin out of the spray gun.

[0014] Further, an air delivery pipe is fixedly connected to the bracket. The air delivery pipe is connected and communicated with the main blowing pipeline, the fluidization pipeline, the pressurization pipeline and the gas supply pipeline. The air delivery pipe is provided with a connecting pipe for connecting the gas source.

[0015] In summary, the present application has the following technical effects: 1. By providing a toner cartridge, a main blowing pipeline, and a spray gun disposed at the bottom of the electric arc furnace and fixedly connected to the bottom blowing brick, the toner in the toner cartridge is transported to the spray gun through the main blowing pipeline, and finally the toner is transported from the spray gun to the molten steel at the bottom of the electric arc furnace, achieving the purpose of improving the utilization rate of the toner and reducing the smelting cost; 2. By providing a fluidization pipeline, the toner is "fluidized" by gas, converting the statically piled toner into a "quasi-fluid" state with fluidity, thereby solving the problem of unsmooth transportation caused by particle accumulation and bridging of the toner, and at the same time avoiding agglomeration or blockage of the toner in the pipeline; 3. By providing a gas supply pipeline and a recovery pipe, when the spray gun is blocked by piled toner, the air flow can generate negative pressure in the recovery pipe when passing through the Venturi tube, so that the recovery pipe sucks out the blocked and piled toner in the spray gun through the powder suction pipe, facilitating the maintenance of the spray gun. Description of the Drawings

[0016] Figure 1 is a schematic structural view of an efficient powder spraying device for metal refining according to the present application; Figure 2 is a schematic structural view of the efficient powder spraying device from another angle according to the present application; Figure 3 is a schematic structural view of the fluidization pipeline according to the present application; Figure 4 is a schematic structural view showing the powder spraying pipe inside the spray gun according to the present application.

[0017] In the figure, 1, bracket; 2, toner cartridge; 3, blanking pipe; 4, main blowing pipeline; 41, ejector; 5, spray gun; 51, gun body; 52, powder spraying pipe; 53, toner bin; 54, powder suction pipe; 6, fluidization pipeline; 61, fluidization pipe; 62, air distribution ring; 63, air spraying pipe; 7, pressurization pipeline; 71, pressurization pipe; 8, storage bin; 9, gas supply pipeline; 91, gas supply pipe; 92, Venturi tube; 10, recovery pipe; 20, gas transmission pipe; 201, connecting pipe; 30, bottom blowing brick. Detailed Embodiments

[0018] The following further elaborates on the present application in conjunction with the drawings.

[0019] Refer to Figure 1 and Figure 2, An efficient powder spraying device for metal refining provided in this embodiment includes a support 1, a carbon powder tank 2, a bin 8, a main blowing pipeline 4, and a spray gun 5. The spray gun 5 is arranged at the bottom of the electric arc furnace and fixedly connected to the bottom blowing brick 30. The support 1 is fixed on the working surface. Both the carbon powder tank 2 and the bin 8 are fixed within the support 1. The bin 8 and the carbon powder tank 2 are used for loading carbon powder. The bin 8 is arranged above the carbon powder tank 2 and is used to convey carbon powder into the carbon powder tank 2. The feeding pipe 3 is fixedly connected and communicated with the lower part of the carbon powder tank 2. One end of the main blowing pipeline 4 is connected and communicated with a gas source, and the other end is fixedly connected and communicated with the spray gun 5. A ejector 41 is fixedly connected within the main blowing pipeline 4. The feeding pipe 3 is fixedly connected and communicated with the ejector 41. The main blowing pipeline 4 is used to convey high-velocity air flow, and the ejector 41 is used to send the carbon powder in the feeding pipe 3 into the main blowing pipeline 4. In this embodiment, a manual ball valve is arranged between the bin 8 and the carbon powder tank 2, and the manual ball valve is used to control the opening and closing of the connection between the bin 8 and the carbon powder tank 2. A manual regulating valve and a pneumatic ball valve are arranged between the feeding pipe 3 and the ejector 41, and both the manual regulating valve and the pneumatic ball valve are used to control the opening and closing of the feeding pipe 3.

[0020] Refer to Figure 2 and Figure 3 , The carbon powder tank 2 is also provided with a fluidization pipeline 6. One end of the fluidization pipeline 6 is connected and communicated with a gas source, and the other end is fixedly connected and communicated with the bottom of the carbon powder tank 2. The fluidization pipeline 6 is used for fluidizing the carbon powder to enable uniform conveyance of the carbon powder and prevent the carbon powder from clogging within the carbon powder tank 2. The fluidization pipeline 6 includes a fluidization pipe 61, a gas distribution ring 62, and a spray gas pipe 63. The fluidization pipe 61 is connected to the gas source. The gas distribution ring 62 is sleeved outside the carbon powder tank 2. A number of spray gas pipes 63 are provided. The spray gas pipes 63 are evenly distributed in a circle around the carbon powder tank 2. Both ends of the spray gas pipe 63 are fixedly connected and communicated with the gas distribution ring 62 and the carbon powder tank 2 respectively. The gas distribution ring 62 is fixedly connected and communicated with the fluidization pipe 61.

[0021] Refer to Figure 1 and Figure 2 , The carbon powder tank 2 is also provided with a pressurization pipeline 7. The pressurization pipeline 7 includes a pressurization pipe 71. One end of the pressurization pipe 71 is connected to the gas source, and the other end is fixedly connected and communicated with the top of the carbon powder tank 2. The pressurization pipe 71 is used to convey compressed gas into the carbon powder tank 2 to ensure stable output of the carbon powder.

[0022] Refer to Figure 1 and Figure 2, a storage bin 8 is provided with a gas supply pipeline 9. The gas supply pipeline 9 includes a gas supply pipe 91 and a Venturi tube 92. One end of the gas supply pipe 91 is connected to a gas source, and the other end is fixedly connected and communicated with the storage bin 8. The gas supply pipeline 9 is used to assist the storage bin 8 in adding toner to the toner cartridge 2; a recovery pipe 10 is arranged between the gas supply pipe 91 and the spray gun 5, and a powder suction pipe 54 is arranged on the spray gun 5. The powder suction pipe 54 is used to recover the residual toner in the spray gun 5. The Venturi tube 92 is fixedly connected to the gas supply pipe 91. One end of the recovery pipe 10 is fixedly connected and communicated with the constriction of the Venturi tube 92, and the other end is fixedly connected and communicated with the powder suction pipe 54.

[0023] Referring to Figure 2 and Figure 4 , the spray gun 5 includes a gun body 51 and a powder spray pipe 52. A toner cartridge 53 is arranged at one end of the gun body 51 close to the main blowing pipeline 4. The main blowing pipeline 4 is communicated with the toner cartridge 53. A plurality of powder spray pipes 52 are arranged, and each powder spray pipe 52 is arranged in the gun body 51. The powder spray pipe 52 is fixedly connected to the gun body 51. One end of the powder spray pipe 52 is communicated with the toner cartridge 53, and the other end passes through the end face of the spray gun 5 far from the main blowing pipeline 4. The powder spray pipe 52 is used to convey the toner in the toner cartridge 53 out of the spray gun 5.

[0024] Referring to Figure 1 and Figure 2 , an air delivery pipe 20 is fixedly connected to the bracket 1. The air delivery pipe 20 is connected and communicated with the main blowing pipeline 4, the fluidization pipeline 6, the pressurization pipeline 7 and the gas supply pipeline 9. The air delivery pipe 20 is provided with a connecting pipe 201. The connecting pipe 201 is used to connect to a gas source. In this embodiment, the gas source is preferably compressed gas (such as nitrogen). Using compressed gas can play a cooling role (the gas absorbs heat and cools down). A flow meter is arranged on the connecting pipe 201. The flow meter is used to detect the gas flow rate flowing into the connecting pipe 201. Pressure regulating valves and check valves are arranged on the main blowing pipeline 4, the fluidization pipeline 6, the pressurization pipeline 7 and the gas supply pipeline 9; an electromagnetic valve is also arranged near the Venturi tube 92 of the gas supply pipeline 9, and a check valve is arranged near the powder suction pipe 54 on the recovery pipe 10. Another electromagnetic valve is arranged near the Venturi tube 92 on the recovery pipe 10. The setting of the two electromagnetic valves enables compressed gas to be separately conveyed into the storage bin 8, and the electromagnetic valve can be opened when conveying gas into the storage bin 8, so that the toner in the spray gun 5 can be recovered through the recovery pipe 10.

[0025] Referring to Figure 1 and Figure 2 , a dust collector is arranged at the storage bin 8. In this embodiment, the dust collector is preferably a blower. The blower is fixedly connected to the storage bin 8. The blower is used to suck away the toner powder generated during the feeding of the storage bin 8, reducing the environmental pollution caused during the feeding of the storage bin 8.

[0026] The implementation principle of an efficient powder spraying device for metal refining in an embodiment of the present application is as follows: When using the powder spraying device, first open the manual ball valve between the material bin 8 and the carbon powder tank 2, and then only open the solenoid valve on the gas supply pipeline 9, so as to transport the carbon powder in the material bin 8 into the carbon powder tank 2. When the carbon powder in the carbon powder tank 2 is added to the preset amount, close the solenoid valve on the gas supply pipeline 9 to complete the feeding of the carbon powder tank 2; at this time, open the pressure regulating valves and check valves on the main blowing pipeline 4, the pressurizing pipeline 7 and the fluidizing pipeline 6, and respectively adjust the pressures of the main blowing pipeline 4, the pressurizing pipeline 7 and the fluidizing pipeline 6. Compressed gas is transported into the carbon powder tank 2 through the pressurizing pipeline 7, and at the same time, the compressed gas is transported to the air distribution ring 62 through the fluidizing pipe 61. Finally, the air distribution ring 62 is transported into the carbon powder tank 2 through the powder spraying pipe 63, making the carbon powder in the carbon powder tank 2 in a fluidized state, which is convenient for the carbon powder to be transported into the main blowing pipeline 4 through the blanking pipe 3. At this time, open the manual regulating valve and the pneumatic ball valve at the blanking pipe 3, and the fluidized carbon powder in the carbon powder tank 2 enters the main blowing pipeline 4 through the blanking pipe 3, and is finally transported into the carbon powder bin 53 along the main blowing pipeline 4. Finally, it is transported from the carbon powder bin 53 to the molten steel at the bottom of the electric arc furnace through the powder spraying pipe 52, achieving the purpose of improving the utilization rate of carbon powder and reducing the smelting cost.

[0027] This specific embodiment is only an interpretation of the present application, and it does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions according to needs, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. An efficient powder injection device for metal refining, characterized in that: It includes a bracket (1), a toner cartridge (2), a blanking pipe (3), a main blowing pipeline (4) and a spray gun (5). The spray gun (5) is arranged at the bottom of the electric arc furnace and fixedly connected to the bottom blowing brick (30). The bracket (1) is fixed on the working surface, the toner cartridge (2) is fixed within the bracket (1), the toner cartridge (2) is used for loading toner, the blanking pipe (3) is fixedly connected and communicated with the toner cartridge (2), one end of the main blowing pipeline (4) is connected and communicated with a gas source, the other end is fixedly connected and communicated with the spray gun (5), an ejector (41) is fixedly connected within the main blowing pipeline (4), the blanking pipe (3) is fixedly connected and communicated with the ejector (41), the main blowing pipeline (4) is used for conveying high-velocity air flow, and the ejector (41) is used for sending the toner within the blanking pipe (3) to the main blowing pipeline (4).

2. The high-efficiency powder spraying device for metal refining according to claim 1, wherein: The toner cartridge (2) is further provided with a fluidization pipeline (6). One end of the fluidization pipeline (6) is connected and communicated with a gas source, and the other end is fixedly connected and communicated with the bottom of the toner cartridge (2). The fluidization pipeline (6) is used for fluidizing the toner.

3. The high-efficiency powder injection device for metal refining according to claim 2, wherein: The fluidization pipeline (6) includes a fluidization pipe (61), a gas distribution ring (62) and a gas injection pipe (63). The fluidization pipe (61) is connected to the gas source, the gas distribution ring (62) is sleeved outside the toner cartridge (2), several gas injection pipes (63) are provided, both ends of the gas injection pipe (63) are fixedly connected and communicated with the gas distribution ring (62) and the toner cartridge (2) respectively, and the gas distribution ring (62) is fixedly connected and communicated with the fluidization pipe (61).

4. The high-efficiency powder injection device for metal refining according to claim 1, wherein: The toner cartridge (2) is further provided with a pressurization pipeline (7). The pressurization pipeline (7) includes a pressurization pipe (71). One end of the pressurization pipe (71) is connected to the gas source, and the other end is fixedly connected and communicated with the top end of the toner cartridge (2). The pressurization pipe (71) is used for conveying compressed gas into the toner cartridge (2) to ensure stable output of the toner.

5. The high-efficiency powder injection device for metal refining according to claim 1, characterized in that: A storage bin (8) is arranged above the toner cartridge (2). The storage bin (8) is fixedly connected to the bracket (1), and is fixedly connected and communicated with the toner cartridge (2). The storage bin (8) is used for conveying toner into the toner cartridge (2).

6. The high-efficiency powder spraying device for metal refining according to claim 5, characterized in that: The storage bin (8) is provided with a gas supply pipeline (9). The gas supply pipeline (9) includes a gas supply pipe (91). One end of the gas supply pipe (91) is connected to the gas source, and the other end is fixedly connected and communicated with the storage bin (8). The gas supply pipeline (9) is used for assisting the storage bin (8) to add toner into the toner cartridge (2).

7. The high-efficiency powder injection device for metal refining according to claim 6, characterized in that: A recovery pipe (10) is arranged between the gas supply pipe (91) and the spray gun (5). A powder suction pipe (54) is arranged on the spray gun (5). The powder suction pipe (54) is used for recovering the residual toner within the spray gun (5). A Venturi tube (92) is fixedly connected to the gas supply pipe (91). One end of the recovery pipe (10) is fixedly connected and communicated with the constriction of the Venturi tube (92), and the other end is fixedly connected and communicated with the powder suction pipe (54).

8. An efficient powder injection device for metal refining according to claim 1, characterized in that: The spray gun (5) includes a gun body (51) and a powder spraying pipe (52). One end of the gun body (51) close to the main blowing pipeline (4) is provided with a toner cartridge (53). The main blowing pipeline (4) is communicated with the toner cartridge (53). A plurality of powder spraying pipes (52) are provided. Each powder spraying pipe (52) is arranged in the gun body (51). The powder spraying pipe (52) is fixedly connected to the gun body (51). One end of the powder spraying pipe (52) is communicated with the toner cartridge (53), and the other end passes through the end face of the spray gun (5) far from the main blowing pipeline (4). The powder spraying pipe (52) is used for conveying the toner in the toner cartridge (53) out of the spray gun (5).

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