A side-blowing spray gun for a smelting furnace

Abstract

This utility model discloses a side-blowing spray gun for a smelting furnace, comprising a gas injection pipe and an oxygen-enriched spray pipe nested inside the gas injection pipe. A nozzle is installed at the inlet of the oxygen-enriched spray pipe, located inside the gas injection pipe at a distance of 15-30 mm from the inlet. A gas collecting chamber is provided at the end of the gas injection pipe, and a gas connector is connected to the gas collecting chamber. A connecting seat is provided at the end of the gas collecting chamber, and this connecting seat is bolted to a sealing flange located at the end of the oxygen-enriched spray pipe. This utility model solves the problems of short service life, natural gas leakage, and poor safety performance of existing spray guns, and has the advantages of simple structure, low cost, strong stirring power of the molten pool, good smelting effect, low energy consumption, and long service life.

Description

Technical Field

[0001] This utility model relates to a side-blowing spray gun, specifically a side-blowing spray gun for a smelting furnace. Background Technology

[0002] After years of development, side-blown molten pool smelting technology has become a mature and reliable smelting process. This technology features high efficiency and low consumption, strong raw material adaptability, and outstanding economic benefits. In particular, its simple process, convenient operation, large capacity, and low investment have led to its widespread promotion and application in my country.

[0003] Side-blown lances are typically installed below the melt surface to effectively enhance reduction and stirring. To improve reduction efficiency, multiple lances are installed on side-blown furnaces for non-ferrous metal smelting. However, the working environment of these lances is extremely harsh; combustible gases can easily escape from the furnace walls, causing problems such as fires outside the furnace and water seepage through the walls, seriously affecting the safe operation of metallurgical furnaces. Therefore, improving the service life and safety of lances is of significant practical importance. Utility Model Content

[0004] The purpose of this invention is to provide a side-blowing spray gun for a smelting furnace to solve the problems of short service life, natural gas leakage, and poor safety performance of existing spray guns.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A side-blowing spray gun for a smelting furnace includes a gas spray pipe and an oxygen-enriched spray pipe nested inside the gas spray pipe. A nozzle is installed at the inlet of the oxygen-enriched spray pipe and is located inside the gas spray pipe, 15-30 mm away from the inlet of the gas spray pipe. A gas collecting chamber is provided at the end of the gas spray pipe, and a gas connector is connected to the gas collecting chamber. A connecting seat is provided at the end of the gas collecting chamber, and the connecting seat is fixed to a sealing flange provided at the end of the oxygen-enriched spray pipe by bolts.

[0007] The outer diameter of the nozzle is the same as the inner diameter of the gas nozzle, and multiple gas passages are uniformly opened along the circumference on the outer wall of the nozzle. The nozzle has a nozzle with a gradually decreasing diameter inside, and the large port diameter of the nozzle is the same as the inner diameter of the oxygen-enriched nozzle, while the small port diameter of the nozzle is 0.4 to 0.8 times the inner diameter of the oxygen-enriched nozzle.

[0008] The gain effect of this utility model:

[0009] (1) The side-blowing spray gun of this utility model is inserted into the smelting furnace from the side-blowing water jacket above the slag surface. The nozzle of the side-blowing spray gun is immersed in the slag pool for 100mm to 500mm. Combustible gas or oxygen-enriched air is injected into the molten pool, causing the melt around the gun to vortex. After the air or oxygen-enriched air enters the melt, a large number of dispersed bubbles are formed. Due to the dispersed bubbles in the melt and the vortex of the melt, the heat transfer and mass transfer process is accelerated, and the smelting reduction efficiency is improved.

[0010] (2) The space in front of the nozzle of the side-blowing spray gun forms a premixing chamber, which ensures that the combustible gas and the oxygen-enriched air are mixed and fully combusted, reduces the escape of combustible gas outside the furnace, improves the combustion efficiency of combustible gas and the safety of the side-blowing spray gun; the nozzle is made of 310S material, which solves the problem of short service life and easy burn-out of the spray gun, and achieves the purpose of this invention. Attached Figure Description

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

[0012] Figure 2 for Figure 1 Side view of the structure of the gun head section.

[0013] In the diagram, 1-gas nozzle, 2-rich oxygen nozzle, 3-nozzle head, 4-gas passage, 5-nozzle, 6-gas collection chamber, 7-gas connector pipe, 8-connecting seat, 9-sealing 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 side-blowing nozzle for a smelting furnace includes a gas nozzle 1 and an oxygen-enriching nozzle 2 nested inside the gas nozzle 1. A nozzle head 3 is installed at the mouth of the oxygen-enriching nozzle 2, and the nozzle head 3 is located inside the gas nozzle 1, 15-30 mm away from the mouth of the gas nozzle 1. The outer diameter of the nozzle head 3 is the same as the inner diameter of the gas nozzle 1, and multiple gas passages 4 are evenly formed along the circumference on the outer wall of the nozzle head 3. The nozzle head 3 has a nozzle 5 with a gradually decreasing diameter inside, and the large port diameter of the nozzle 5 is the same as the inner diameter of the oxygen-enriching nozzle 2, while the small port diameter of the nozzle 5 is 0.4-0.8 times the inner diameter of the oxygen-enriching nozzle 2. A gas collecting chamber 6 is provided at the end of the gas nozzle 1, and a gas connector pipe 7 is connected to the gas collecting chamber 6. A connecting seat 8 is provided at the end of the gas collecting chamber 6, and the connecting seat 8 is fixed to a sealing flange 9 provided at the end of the oxygen-enriching nozzle 2 by bolts.

[0016] The specific working process of this utility model is as follows:

[0017] 1. Preparations before operation

[0018] Confirm the height of the molten pool, ensuring that the liquid level is 100mm below the lower edge of the spray gun nozzle, in preparation for loading the gun.

[0019] 2. Gun loading procedure

[0020] Connecting pipelines: Connect the gas connector pipe 7 to the combustible gas delivery pipe, and connect the oxygen enrichment nozzle 2 to the oxygen enrichment delivery pipe;

[0021] Install the spray gun: Place the side-blowing spray gun into the side-blowing water jacket of the furnace wall;

[0022] Adjust the angle: Ensure the spray gun maintains an 80° angle with the furnace wall;

[0023] Complete the inspection: Confirm that all connections are securely installed.

[0024] 3. Usage Guidelines

[0025] Start-up sequence: First open the combustible gas regulating valve, then open the oxygen-enriched air regulating valve;

[0026] Immersion depth: Immerse the nozzle into the slag pool to a depth of 100-500mm;

[0027] Injection operation: The mixed gas is immersed in the injection, which causes the melt to form a vortex;

[0028] Parameter adjustment:

[0029] Once the molten pool level exceeds the spray gun, adjust the valve opening according to the slag layer thickness;

[0030] Control the pressure of the mixed nitrogen natural gas to 0.1-0.3 MPa;

[0031] Control the oxygen-enriched air pressure to 0.05-0.35 MPa.

[0032] The side-blowing lance of this invention is inserted into the smelting furnace from the side-blowing water jacket above the slag surface. The lance head is immersed in the slag pool by 100mm to 500mm, and combustible gas or oxygen-enriched air is injected into the molten pool, causing the melt around the lance to vortex. After the air or oxygen-enriched air enters the melt, it forms a large number of dispersed bubbles. Due to the dispersed bubbles in the melt and the vortex of the melt, the heat and mass transfer processes are accelerated, and the smelting reduction efficiency is improved.

Claims

1. A side-blowing spray gun for a smelting furnace, characterized in that, It includes a gas nozzle (1) and an oxygen-enriched nozzle (2) nested inside the gas nozzle (1). The nozzle (3) is installed at the mouth of the oxygen-enriched nozzle (2) and is located inside the gas nozzle (1), 15~30mm away from the mouth of the gas nozzle (1). A gas collecting chamber (6) is provided at the end of the gas nozzle (1), and a gas connector pipe (7) is connected to the gas collecting chamber (6). A connecting seat (8) is provided at the end of the gas collecting chamber (6), and the connecting seat (8) is fixed to the sealing flange (9) provided at the end of the oxygen-enriched nozzle (2) by bolts.

2. The side-blowing spray gun for a smelting furnace as described in claim 1, characterized in that, The outer diameter of the nozzle (3) is the same as the inner diameter of the gas nozzle (1), and multiple gas passages (4) are uniformly opened along the circumferential direction on the outer wall of the nozzle (3). The nozzle (3) has a nozzle (5) with a gradually decreasing diameter inside, and the large port diameter of the nozzle (5) is the same as the inner diameter of the oxygen-enriched nozzle (2), and the small port diameter of the nozzle (5) is 0.4 to 0.8 times the inner diameter of the oxygen-enriched nozzle (2).

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