A dual-channel pulverized coal spray gun

Abstract

This utility model discloses a dual-channel pulverized coal spray gun, including an oxygen-enriched pipe and a pulverized coal pipe. The pulverized coal pipe is sleeved inside the oxygen-enriched pipe, and the center lines of the pulverized coal pipe and the oxygen-enriched pipe coincide. One end of the oxygen-enriched pipe is provided with a mixing chamber, and the other end is connected to a pulverized coal receiving seat via a flange. The pulverized coal receiving seat is connected to the pulverized coal pipe. A passage for the pulverized coal pipe is centrally located inside the mixing chamber. Multiple gas channels are evenly arranged in a circumferential direction around the passage for the pulverized coal pipe, and the diameter of each gas channel is smaller than the radius of the oxygen-enriched pipe. By reducing the diameter at the nozzle, the gas pressure at the nozzle is increased, avoiding backfire erosion caused by pressure fluctuations at the nozzle, and improving the overall service life of the spray gun.

Description

Technical Field

[0001] This utility model belongs to the technical field of smelting equipment, specifically relating to a dual-channel pulverized coal spray gun. Background Technology

[0002] The top-blown furnace system adopts an oxygen-enriched top-blown nickel smelting process. The process flow is as follows: after granulation, the concentrate is mixed with flux and transported to the top-blown furnace for smelting via a feeding system. Simultaneously, pulverized coal is blown into the molten pool from the side of the furnace body as a reducing agent and fuel through a spray gun. However, this technology has significant shortcomings:

[0003] 1. Low smelting efficiency: The lack of enhanced smelting measures resulted in long smelting cycles and high energy consumption.

[0004] 2. Defects in the spray gun system: Existing spray guns suffer from technical bottlenecks such as short lifespan (average 20 days), low smelting efficiency, insufficient operating rate, low bed energy efficiency, and high maintenance costs.

[0005] 3. Insufficient economic efficiency: High energy consumption and frequent replacement of spray guns lead to high overall operating costs.

[0006] To address this, Chinese utility model patent CN202022410856.X discloses a pulverized coal spray gun that supplies oxygen via an oxygen spray gun, employing oxygen-enriched smelting to significantly shorten smelting time by 30-50%, greatly improving operating efficiency, significantly increasing bed capacity, and reducing costs. However, its technical solution still has room for improvement. For example, although nitrogen protection is used to some extent to avoid high-temperature ablation, the nozzle does not undergo diameter-changing and pressurization treatment. Therefore, if gas pressure fluctuates, there is still a risk of nozzle ablation. Utility Model Content

[0007] The purpose of this utility model is to provide a dual-channel pulverized coal spray gun. By changing the diameter of the nozzle, the gas pressure at the nozzle is increased, which avoids backfire and erosion caused by pressure fluctuations at the nozzle and improves the overall service life of the spray gun.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A dual-channel pulverized coal spray gun includes an oxygen-enriched pipe and a pulverized coal pipe. The pulverized coal pipe is sleeved inside the oxygen-enriched pipe, and the center lines of the pulverized coal pipe and the oxygen-enriched pipe coincide. One end of the oxygen-enriched pipe is provided with a mixing chamber, and the other end is connected to a pulverized coal receiving seat through a flange. The pulverized coal receiving seat is connected to the pulverized coal pipe. A passage for the pulverized coal pipe is centrally located inside the mixing chamber. Multiple gas channels are uniformly arranged in a circumferential direction around the passage for the pulverized coal pipe, and the diameter of each gas channel is smaller than the radius of the oxygen-enriched pipe.

[0010] Compared with the existing technology, this utility model not only achieves the advantages of significantly shortening the melting time, significantly improving the working rate, and significantly improving the bed capacity, but also increases the gas pressure at the nozzle by changing the nozzle diameter, avoiding backfire erosion caused by pressure fluctuations at the nozzle, and improving the overall service life of the spray gun. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Figure 2 for Figure 1 AA sectional view.

[0013] In the diagram, 1-mixing chamber, 2-oxygen enrichment pipe, 3-pulverized coal pipe, 4-pulverized coal receiving seat, 5-gas passage, 6-inlet pipe, 7-installation flange. Detailed Implementation

[0014] The present invention will be further explained below with reference to the accompanying drawings.

[0015] like Figure 1-2 As shown, a dual-channel pulverized coal spray gun includes an oxygen-enriched pipe 2 and a pulverized coal pipe 3. The pulverized coal pipe 3 is fitted inside the oxygen-enriched pipe 2, and the center lines of the pulverized coal pipe 3 and the oxygen-enriched pipe 2 coincide. One end of the oxygen-enriched pipe 2 is provided with a mixing chamber 1, and the other end is connected to a pulverized coal receiving seat 4 via a flange. The pulverized coal receiving seat 4 is connected to the pulverized coal pipe 3. A passage for the pulverized coal pipe 3 is centrally located inside the mixing chamber 1. Multiple gas channels 5 are uniformly arranged in a circumferential direction around the passage for the pulverized coal pipe 3, and the diameter of each gas channel 5 is smaller than the radius of the oxygen-enriched pipe 2. An air inlet pipe 6 is connected to the oxygen-enriched pipe 2 near the pulverized coal receiving seat 4. A mounting flange 7 is also welded to the oxygen-enriched pipe 2, and the mounting flange 7 is located downstream of the air inlet pipe 6.

[0016] Specifically, the pulverized coal pipe 3 and the oxygen-enriched pipe 2 are made of high-temperature resistant ceramic. The diameter of the pulverized coal pipe 3 is 20-30mm, and the diameter of the oxygen-enriched pipe 2 is 70-80mm. The outlets of the oxygen-enriched pipe 2 and the pulverized coal pipe 3 are on the same vertical plane. The pulverized coal pipe 3 and the pulverized coal receiving seat 4 are connected by threaded joints, making them detachable and facilitating the maintenance or replacement of the pulverized coal pipe 3, thus extending the overall lifespan of the spray gun.

[0017] The specific application process is as follows:

[0018] 1. Equipment Installation

[0019] The dual-channel pulverized coal injection lance is fixed to the designated injection lance position in the smelting furnace via the mounting flange 7. Oxygen-enriched air is delivered to the mixing chamber 1 through the air inlet pipe 6, and after being pressurized by the variable diameter structure, it forms a high-pressure airflow that is ejected to provide an oxygen-enriched environment for smelting.

[0020] 2. Smelting operation

[0021] Pulverized coal conveying: Pulverized coal is accelerated and pressurized by pulverized coal receiving seat 4, and injected into the melting pool from the head of mixing chamber 1 through pulverized coal pipe 3 to achieve the mixing and combustion of pulverized coal and oxygen-enriched air;

[0022] Process control: By dynamically adjusting the oxygen concentration and the pulverized coal supply ratio, the smelting temperature and reaction rate are precisely controlled to ensure the stability of the molten pool.

[0023] 3. Inspection and maintenance

[0024] The system adopts a modular design, supporting quick assembly and disassembly.

[0025] Disconnect: Loosen the fixing bolts of the mounting flange 7 and cut off the air supply to the air inlet pipe 6;

[0026] Separation component: Disconnect the flange connecting the pulverized coal receiving seat 4 and the oxygen-enriched pipe 2;

[0027] Spray gun replacement: After the spray gun is disassembled, it can be repaired or replaced directly, which significantly improves maintenance efficiency.

Claims

1. A dual-channel pulverized coal spray gun, characterized in that, It includes an oxygen-enriched pipe (2) and a pulverized coal pipe (3). The pulverized coal pipe (3) is fitted inside the oxygen-enriched pipe (2), and the center line of the pulverized coal pipe (3) coincides with that of the oxygen-enriched pipe (2). One end of the oxygen-enriched pipe (2) is provided with a mixing chamber (1), and the other end is connected to a pulverized coal receiving seat (4) through a flange. The pulverized coal receiving seat (4) is connected to the pulverized coal pipe (3). The mixing chamber (1) is provided with a passage for the pulverized coal pipe (3) in the center. Multiple gas channels (5) are uniformly arranged in a ring around the passage for the pulverized coal pipe (3), and the diameter of a single gas channel (5) is smaller than the radius of the oxygen-enriched pipe (2).

2. The dual-channel pulverized coal injection gun as described in claim 1, characterized in that, An air inlet pipe (6) is connected to the oxygen-enriched pipe (2) on the side near the pulverized coal receiving seat (4).

3. The dual-channel pulverized coal injection gun as described in claim 2, characterized in that, An installation flange (7) is also fitted onto the oxygen enrichment pipe (2), which is located downstream of the air inlet pipe (6).

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