Airtight cooling transition pipe assembly facilitating safe insertion and extraction of spray gun at blast-furnace tuyere

Abstract

An airtight cooling transition pipe assembly facilitating safe insertion and extraction of a spray gun at a blast-furnace tuyere is characterized in that one side of a three-way transition pipe is connected with a blowdown pipe, an inner cavity of the three-way transition pipe is a coal injection gun channel, an inner cavity of the blowdown pipe is a high-pressure nitrogen channel, and the end, away from the three-way transition pipe, of the blowdown pipe is connected with a first ball valve through a flange; the other end of the first ball valve is connected with a second ball valve through a flange, and a quick connector is installed at the outer end of the second ball valve. The assembly has the advantages that high-pressure nitrogen is reversely blown into the blast-furnace tuyere through the gun barrel, meanwhile, a gap between the gun barrel and the gun can be sealed when the gun is pulled out or inserted, blast furnace hot air and hot coke breeze are prevented from being sprayed out of the gap, meanwhile, a cold air wall formed by the nitrogen can cool the gun barrel, and the blast furnace tuyere is cooled through the cold air wall. The gun barrel is prevented from being heated to deform and expand in the plugging and unplugging process, the safety of the operation of plugging and unplugging the coal injection gun by a blast furnace operator is effectively improved, and the goal of safety, greenness, high efficiency and low consumption in the blast furnace ironmaking process is promoted to be achieved.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace ironmaking equipment, specifically to an airtight cooling transition pipe assembly that facilitates the safe insertion and removal of the spray gun at the blast furnace tuyeres. Background Technology

[0002] In the steel industry, the original design of blast furnace ironmaking relied on a steel ball inside a box to seal the pulverized coal injection lance sleeve on the tuyere blowpipe. During insertion or removal of the lance, the steel ball shifted from the seal, allowing hot air and coke dust from the blast furnace to escape through the gap between the sleeve and the lance. This posed a safety hazard for pipe fitters, easily causing burns and scalds. Especially under high pressure, lances that couldn't inject coal could only be removed and replaced when there was an opportunity to reduce or stop the blast, resulting in prolonged periods of no coal injection at that tuyere. Stopping injection required nitrogen cooling of the lances at that tuyere, consuming approximately 300 cubic meters of nitrogen per lance per hour, leading to significant cost waste. Furthermore, prolonged periods without coal injection at tuyeres resulted in excessively high coal injection loads at other tuyeres, causing uneven and incomplete coal combustion, impacting blast furnace efficiency.

[0003] Therefore, there is an urgent need to provide an airtight cooling transition tube assembly that facilitates the safe insertion and removal of the spray gun at the blast furnace tuyeres, in order to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings and defects of existing technologies by providing an airtight cooling transition pipe assembly that facilitates the safe insertion and removal of blast furnace tuyeres. This assembly allows high-pressure nitrogen gas to be blown back through the tungsten tube into the blast furnace tuyeres. Simultaneously, it seals the gap between the tungsten tube and the tungsten during insertion and removal, preventing hot blast and hot coke dust from escaping through the gap. The cold air wall formed by the nitrogen gas also cools the tungsten tube, preventing it from deforming or expanding due to heat during insertion and removal. This effectively improves the safety of blast furnace operators when inserting and removing pulverized coal injection tungstens, thereby promoting the achievement of safe, green, efficient, and low-consumption goals in blast furnace ironmaking.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an airtight cooling transition pipe assembly for facilitating safe insertion and removal of the blast furnace tuyere injection lance, comprising a three-way transition pipe installed between the tuyere direct blowing pipe and the pulverized coal injection lance ball valve, wherein one side of the three-way transition pipe is connected to a gas supply pipe, and the inner cavity of the three-way transition pipe is a pulverized coal injection lance channel, and the inner cavity of the gas supply pipe is a high-pressure nitrogen channel, wherein the end of the gas supply pipe away from the three-way transition pipe is connected to a first ball valve via a flange, and the other end of the first ball valve is connected to a second ball valve via a flange, and a quick connector is installed on the outer end of the second ball valve.

[0006] Furthermore, both ends of the three-way pipe are equipped with connecting flanges.

[0007] Furthermore, the air supply pipe is connected to the three-way cross pipe at a 45° angle.

[0008] Furthermore, a flange gasket is provided between the air supply pipe and the first ball valve, and a flange gasket is provided between the first ball valve and the second ball valve.

[0009] Furthermore, the inner diameter of the pulverized coal injection gun channel A is smaller than the outer diameter of the pulverized coal injection gun.

[0010] Furthermore, both the first ball valve and the second ball valve are high-temperature resistant manual ball valves.

[0011] The beneficial effects of this utility model after adopting the above technical solution are as follows: the component allows high-pressure nitrogen gas to be blown back into the blast furnace tuyeres through the gun barrel, and at the same time, it can seal the gap between the gun barrel and the gun when pulling and inserting the gun, preventing hot air and hot coke from being sprayed out of the gap. Meanwhile, the cold air wall formed by the nitrogen gas can cool the gun barrel, preventing the gun barrel from being deformed and expanded due to heat during the insertion and removal process, effectively improving the safety of blast furnace operators in inserting and removing pulverized coal guns, and thus promoting the realization of the goals of safety, greenness, efficiency and low consumption in the blast furnace ironmaking process. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the three-pass tube of this utility model.

[0015] Figure 3 yes Figure 1 The corresponding bottom view structure diagram.

[0016] Figure 4 yes Figure 3 A schematic diagram of the cross-sectional structure of CC.

[0017] Figure 5 This is a schematic diagram of the state of this utility model.

[0018] Explanation of reference numerals in the attached diagram: 1. Three-way cross tube; 2. First ball valve; 3. Second ball valve; 4. Quick connector; 5. Connecting flange; 6. Flange gasket; 7. Air supply pipe; 8. Coal injection gun channel A; 9. High-pressure nitrogen channel B. Detailed Implementation

[0019] See Figures 1-5 As shown, the technical solution adopted in this specific embodiment is as follows: It includes a three-way pipe 1 installed between the air outlet direct blowing pipe and the pulverized coal gun ball valve. One side of the three-way pipe 1 is connected to a gas supply pipe 7, and the inner cavity of the three-way pipe 1 is the pulverized coal gun channel A. The inner cavity of the gas supply pipe 7 is the high-pressure nitrogen channel B. The end of the gas supply pipe 7 away from the three-way pipe 1 is connected to a first ball valve 2 through a flange, and the other end of the first ball valve 2 is connected to a second ball valve 3 through a flange. A quick connector 4 is installed on the outer end of the second ball valve 3.

[0020] More specifically, both ends of the three-way cross-pipe 1 are equipped with connecting flanges 5. The two ends of the three-way cross-pipe 1 are respectively installed between the air outlet direct blowing pipe and the coal injection gun ball valve via the connecting flanges 5.

[0021] More specifically, the air supply pipe 7 is connected to the three-way cross pipe 1 at a 45° angle.

[0022] More specifically, a flange gasket 6 is provided between the air supply pipe 7 and the first ball valve 2, and a flange gasket 6 is provided between the first ball valve 2 and the second ball valve 3. The flange gasket 6 can increase the sealing performance of the components and prevent gas leakage.

[0023] To be more specific, the inner diameter of the pulverized coal injection gun channel A is smaller than the outer diameter of the pulverized coal injection gun.

[0024] More specifically, both the first ball valve 2 and the second ball valve 3 are high-temperature resistant manual ball valves. Because the hot air and coke dust returning from the blast furnace are at high temperatures, using high-temperature resistant manual ball valves ensures the overall service life of the components.

[0025] The working principle of this utility model is as follows: A gas supply pipe 7 and two high-temperature resistant first ball valves 2 and second ball valves 3 are connected at a 45-degree angle to the front end of the three-way pipe 1. The valve handles of the first ball valves 2 and second ball valves 3 are normally removed, and the pipe interface is connected by a quick connector 4. The quick connector 4 allows for easy connection or disconnection when using the component, and also facilitates the component's disconnection when not in use, improving the flexibility of the component during use and not affecting normal production operations. The size of the quick connector 4 is the same as that of the metal hose of the gun, and the switch is controlled by the first ball valves 2 and second ball valves 3. The first ball valves 2 and second ball valves 3 are normally closed. When it is necessary to replace the pulverized coal injection lance at this tuyer, the gas supply pipe 7 and the three-way cross pipe 1 are connected by a metal flexible hose. The first ball valve 2 and the second ball valve 3 are opened, and high-pressure nitrogen gas is injected into the lance barrel through the nitrogen pressure channel B. Since the nitrogen pressure is higher than the hot air pressure, the high-pressure nitrogen gas can form a cold air wall in the pulverized coal injection lance channel A. This cold air blows back through the lance barrel into the blast furnace tuyer. At the same time, it can seal the gap between the lance barrel and the lance when inserting or removing the lance, preventing hot blast air and hot coke dust from spraying out of the gap. This allows the operators to complete the insertion and removal of the blast furnace pulverized coal injection lance safely. In addition, the cold air wall formed by the nitrogen gas can also cool the lance barrel, preventing the lance barrel from deforming or expanding due to heat during the insertion and removal process.

[0026] The above is only used to illustrate the technical solution of this utility model and not to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A gas tight cooling transition pipe assembly for facilitating safe plugging of a blast furnace tuyere lance, characterized by: It includes a three-way cross pipe (1) installed between the air outlet direct blow pipe and the pulverized coal gun ball valve. One side of the three-way cross pipe (1) is connected to a gas supply pipe (7), and the inner cavity of the three-way cross pipe (1) is the pulverized coal gun channel (A). The inner cavity of the gas supply pipe (7) is the high-pressure nitrogen channel (B). The end of the gas supply pipe (7) away from the three-way cross pipe (1) is connected to a first ball valve (2) through a flange, and the other end of the first ball valve (2) is connected to a second ball valve (3) through a flange. A quick connector (4) is installed on the outer end of the second ball valve (3).

2. A gas tight cooling transition pipe assembly for facilitating safe insertion and withdrawal of a lance from a blast furnace tuyere according to claim 1, characterized in that: Both ends of the three-way pipe (1) are equipped with connecting flanges (5).

3. A gas tight cooling transition pipe assembly for facilitating safe insertion and withdrawal of a lance from a blast furnace tuyere according to claim 1, characterized in that: The air supply pipe (7) is connected to the three-way cross pipe (1) at a 45° angle.

4. A gas tight cooling transition pipe assembly for facilitating safe insertion and withdrawal of a lance from a blast furnace tuyere according to claim 1, characterized in that: A flange gasket (6) is provided between the air supply pipe (7) and the first ball valve (2), and a flange gasket (6) is provided between the first ball valve (2) and the second ball valve (3).

5. A gas tight cooling transition pipe assembly for facilitating safe insertion and withdrawal of a lance from a blast furnace tuyere according to claim 1, characterized in that: The inner diameter of the coal injection gun channel (A) is smaller than the outer diameter of the coal injection gun.

6. An air tight cooling transition pipe assembly for facilitating safe insertion and extraction of a lance from a blast furnace tuyere according to claim 1, characterized in that: Both the first ball valve (2) and the second ball valve (3) are high-temperature resistant manual ball valves.

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