CN201873712U - Bottom blowing gas accumulation device of steelmaking ladle - Google Patents

Abstract

The utility model provides a steel-making ladle bottom blowing gas pressure accumulator device which can make the gas flow leading to the upper ventilating brick pipe and the lower ventilating brick pipe uniform. It includes an air intake pipe, an upper air brick pipe and a lower air brick pipe, and also includes a pressure accumulation drum. The air intake pipe and the lower air brick pipe are respectively connected to the two ends of the pressure accumulation drum. connected. After using this device, the air supply pressure of the upper and lower air bricks of the ladle is balanced, and the steel seepage of the air brick core caused by the negative pressure suck back phenomenon of molten steel is basically eliminated, ensuring the normal production.

Description

Bottom blowing gas pressure storage device for steelmaking ladle

technical field

The utility model relates to an operating device for a steelmaking ladle bottom blowing system, in particular to a steelmaking ladle bottom blowing gas pressure storage device.

Background technique

The argon blowing process at the bottom of the ladle is a very important link in the steelmaking process, and its function is to stir the molten steel. The argon gas blown at the bottom of the ladle is blown into the molten steel, dispersed in the molten steel in the form of bubbles and floats up, the surrounding molten steel is driven by buoyancy, and forms an upward stream above the breathable brick, reaches the top of the molten steel, turns to the horizontal direction, and then flows along the ladle The backflow of the wall makes the molten steel circulate in the ladle, thereby rapidly melting the alloy and flux added to the molten steel, promoting the uniform composition and temperature of the molten steel and the floating of inclusions in the molten steel, and removing the steel The non-metallic inclusions and harmful gases in the liquid are eliminated to achieve the purpose of refining molten steel.

The ladle ventilation brick is composed of upper and lower bricks. The original layout of the argon blowing pipeline at the bottom of the ladle is shown in Figure 1.

The original problems in the refining operation of the ladle bottom blowing system are:

1. When the bottom blowing effect of the ladle on site is poor, the effect of the lower ventilating brick is better than that of the upper ventilating brick, and the upper ventilating brick is weaker; while the position of feeding the aluminum wire at the argon blowing station is above the upper ventilating brick, because the ventilation of the upper ventilating brick is weak, resulting in The melting of aluminum wire is difficult, which affects the deoxidation of molten steel. The reason is related to the unreasonable design of the argon blowing steel pipe at the bottom of the ladle. The length of the pipeline leading to the lower ventilation brick is 1750 mm (from the three-way valve to the lower ventilation brick) less than the length of the pipeline leading to the upper ventilation brick 2200 mm (from the three-way valve to the upper ventilation brick), and the pipeline leading to the lower ventilation brick is straight through , and the upper ventilation pipe is connected by a three-way valve; the air flow to the lower ventilation brick is large, and the tributary gas flow distributed to the upper ventilation brick after the three-way valve is turned 90o is significantly smaller than that leading to the lower ventilation brick Air flow; only when the lower air brick is blocked, the upper air brick will have a larger air flow.

2. The molten steel in the ladle is not always blown during the process of bottom blowing argon. When the gas is stopped, the argon pressure in the pipe suddenly drops when the bottom blowing steel pipe is closed, forming a negative pressure, which causes the permeable brick core to block the steel penetration, which affects the effect of the bottom blowing , Seriously affected the smooth flow of production.

Contents of the invention

The technical problem to be solved by the utility model is to provide a pressure accumulator to replace the original three-way valve to make the gas flow leading to the upper and lower ventilation brick pipes uniform, and When the blowing is stopped, the argon pressure in the tube will not suddenly drop to form a negative pressure, which will cause the permeable brick core to be blocked by steel penetration.

The technical solution adopted by the utility model to solve the problems of the technologies described above is:

The steel-making ladle bottom blowing gas pressure storage device includes an air inlet pipe, an upper air brick pipe and a lower air brick pipe, and is characterized in that it also includes a pressure accumulation drum, and the air inlet pipe and the lower air brick pipe are respectively connected with the pressure accumulation Both ends of the drum are connected, and the upper air brick pipe is connected to the side of the pressure storage drum.

In the above solution, the air intake pipe, the lower air brick pipe, the upper air brick pipe and the pressure storage drum are all made of high temperature resistant materials.

In the above solution, the pressure storage drum is cylindrical.

In the above solution, the inner diameter of the pressure storage drum is 280-320 mm, the length is 400-600 mm, and the wall thickness is 7-9 mm.

In the above solution, the high temperature resistant material is a steel material.

The utility model has the advantage that after the gas pressure storage device is added to the ladle, the gas supply pressure of the upper and lower ventilating bricks of the ladle is balanced, and the steel penetration of the ventilating brick core caused by the phenomenon of negative pressure sucking back of the molten steel is basically eliminated, ensuring normal production conduct.

Description of drawings

Figure 1 is a schematic diagram of the original layout of the argon blowing pipeline at the bottom of the original ladle;

Figure 2 is a schematic diagram of the original layout of the argon blowing pipeline at the bottom of the current ladle;

Fig. 3 is the structural representation of this device;

1. Air intake pipe, 2. Upper air brick pipe, 3. Lower air brick pipe, 4. Pressure accumulator drum.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail:

The steelmaking ladle bottom blowing gas pressure storage device shown in Figure 2 and Figure 3 includes an air inlet pipe 1, an upper air brick pipe 2 and a lower air brick pipe 3, and also includes a cylindrical pressure accumulation drum 4, the described The air intake pipe 1 and the lower air brick pipe 3 communicate with the two ends of the pressure accumulation drum 4 respectively, and the upper air brick pipe 2 communicates with the side of the pressure accumulation drum 4 . The air intake pipe, the lower air brick pipe, the upper air brick pipe and the pressure storage drum are all made of high temperature resistant steel materials. Wherein, the inner diameter of the pressure storage drum is 280-320 mm, the length is 400-600 mm, and the thickness of the cylinder wall is 7-9 mm.

In actual use, the bottom blowing pipeline of the ladle is modified, and a gas pressure accumulating drum 4 device is installed on the argon pipeline at the bottom of the ladle to replace the three-way valve. During production, the bottom-blown gas enters the gas pressure storage drum 4 from the intake pipe 1. After a short period of pressure accumulation, the gas passes through the upper and lower breathable bricks in a balanced manner to stir the molten steel in the ladle, so that the aluminum wire added above the upper breathable brick is quickly melted and stirred evenly , because there is a certain amount of gas stored in the pressure accumulator drum 4, when the blowing is stopped, the pressure difference caused by the sudden stop of the blowing will not cause the molten steel to block the slit of the breathable brick due to negative pressure backflow.

Claims (5)

1. The bottom-blowing gas pressure storage device of the steelmaking ladle, including an air inlet pipe, an upper air brick pipe and a lower air brick pipe, is characterized in that it also includes a pressure accumulation drum, and the air inlet pipe and the lower air brick pipe are respectively connected with Both ends of the pressure storage drum are connected, and the upper air brick pipe is connected to the side of the pressure storage drum. 2. The bottom blowing gas pressure accumulator device for steelmaking ladle as claimed in claim 1, characterized in that: the air intake pipe, the lower air brick pipe, the upper air brick pipe and the pressure accumulation drum are all made of high temperature resistant materials become. 3. The pressure accumulator device for bottom-blowing gas in a steelmaking ladle as claimed in claim 1, wherein the pressure accumulator drum is cylindrical. 4. The pressure accumulator device for bottom-blowing gas in a steelmaking ladle as claimed in claim 1, characterized in that the pressure accumulator drum has an inner diameter of 280-320 mm, a length of 400-600 mm, and a wall thickness of 7-9 mm. 5. The pressure storage device for bottom-blowing gas in a steelmaking ladle as claimed in claim 1, wherein the high temperature resistant material is steel.

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