CN205687958U - A kind of blast furnace main channel residual iron placing activity stem bar - Google Patents

Abstract

The utility model discloses a movable flow nozzle for placing residual iron in the main ditch of a blast furnace, which belongs to the field of medium blast furnaces for ironmaking, wherein the shell is in a hollow channel structure, and a lining layer of refractory castable is arranged inside the shell. The top is symmetrically provided with hoisting earrings, and a U-shaped opening is arranged on one side of the upper end of the shell, and the opening is located in the middle of the hoisting earrings. The structure in the utility model controls the trajectory of slag and iron by force, Prevent slag and iron from flowing out of the tank, and avoid major economic losses caused by frequent burning of iron tank cars and railways during the process of putting residual iron in the blast furnace main ditch.

Description

A movable nozzle for placing residual iron in main ditch of blast furnace

technical field

The utility model relates to an iron-making medium blast furnace, in particular to a movable flow nozzle for placing residual iron in the main ditch of the blast furnace.

Background technique

At present, the known extra-large blast furnaces all adopt the iron storage type main ditch to tap iron. Under normal production conditions, 60t of liquid molten iron is always stored in the main ditch. Due to the huge impact force on the inner wall of the main ditch formed by the molten iron flushed from the blast furnace taphole during the tapping process, the inner wall of the main ditch is severely impacted and eroded. Shrinkage and bursting occur due to air cooling, so frequent and timely repairs are required to maintain production.

Every time the main ditch of the blast furnace is repaired, the liquid 60t residual molten iron stored in the main ditch must be discharged into the iron tank. The molten residual molten iron flows out of the main ditch, and the initial velocity when passing through the fixed nozzle is the same as that of the gas in the main ditch. The level of pressure is related to factors such as the size and shape of the slope at the bottom of the main ditch, which cannot be measured in production practice, and there are no rules to follow.

In addition, since the fixed nozzle of the main ditch of the blast furnace is at a certain height from the mouth of the iron can, and the diameter of the mouth of the iron can is constant, if the air resistance is not considered, the residual iron will move along a parabola, and the flow speed of the molten iron will increase with the reduction of the iron storage in the main ditch and the temperature of the molten iron. The reduction is constantly changing, and the change of the flow velocity of molten iron causes the parabolic trajectory to change continuously, resulting in the process of putting residual iron in the main ditch of the blast furnace, often causing high-temperature slag and iron splashing out of the iron tank, and even burning the iron tank car and railway.

In addition, after the iron tank car was burned, the molten iron residue flowed to the ground to weld the rails, causing the iron tank car to fall off the road, forcing the blast furnace to shut down to deal with the accident, which not only affected the blast furnace output and coke ratio, but also consumed a lot of manpower and material resources , resulting in significant economic losses.

Utility model content

The technical task of the utility model is to provide a movable nozzle for putting residual iron in the main ditch of the blast furnace to prevent the molten slag and iron from flowing out of the tank by forcibly controlling the trajectory of the molten slag and iron. To solve the problems in the prior art that molten slag and iron splash out of the iron tank, and even burn the iron tank car and the railway.

The technical scheme adopted by the utility model to solve the technical problem is: a movable nozzle for placing residual iron in the main ditch of a blast furnace, including a shell, which is characterized in that: the shell is a hollow channel structure, and a refractory pouring is arranged inside the shell. The material lining layer is symmetrically provided with hoisting earrings on the top of the shell, and a U-shaped opening is arranged on one side of the upper end of the shell. The opening is located in the middle of the hoisting earrings. The two steel wire ropes are fixedly connected with the hoisting hook of the crane in front of the furnace, and finally connect seamlessly through the U-shaped opening in the upper part of the shell and the fixed nozzle, so that the bottom of the movable nozzle is directly aligned with the mouth of the molten iron tank, so that molten slag and iron cannot flow to the outside of the can.

As a further improvement, the middle part of the casing is funnel-shaped, and the casing includes an upper casing, a middle casing and a lower casing, and the upper casing, the middle casing and the lower casing are connected into one body by welding.

As a further improvement, the cross-sections of the upper shell and the middle shell are both square.

As a further improvement, the channel at the upper end of the lower shell is square, and the channel at the end is circular.

As a further improvement, the height of the upper shell is 1150mm, the height of the middle shell is 700mm, and the height of the lower shell is 1100mm.

As a further improvement, a number of herringbone steel bars are evenly distributed and welded on the inner wall of the outer shell, and after the refractory castable slurry is poured, the refractory castable is firmly grasped by the herringbone bars.

Advantages of the present utility model: 1. The structure in the present utility model can prevent molten slag and iron from flowing out of the tank by forcibly controlling the trajectory of molten slag and iron, and avoid frequent burning of iron tank cars and Significant economic losses caused by railways.

2. Two steel wire ropes are tied to the two hoisting earrings, and are fixedly connected to the hoisting hook of the crane in front of the furnace through the two steel wire ropes. There is no gap between the U-shaped opening on the upper part of the movable nozzle and the fixed nozzle. Align the mouth of the molten iron tank so that the molten slag and iron cannot flow out of the tank, which overcomes the problem of frequently burning the iron tank car and the railway, and at the same time shortens the length of the residual iron ditch from 9.5m to 1.6m, reducing the need for repairing the residual iron ditch For operation, the method of arranging iron ladles on a single-line railway in the casthouse has changed to that of arranging iron ladles on a double-line railway; the number of tanks in a single row has changed from 6 in a single row to 3 in a double row, which greatly simplifies the layout of the casthouse.

3. The main ditch puts the residual iron movable nozzle, which reduces the operation of changing the hot metal tank under high temperature and dust conditions. In fact, the highest application value is to reduce the labor intensity of the workers in front of the furnace and reduce the staffing of the post, so as to realize mechanized operation. Inject the residual molten iron flowing out of the main ditch into the molten iron tank car under the casthouse platform, avoiding the cross-operation with the casthouse platform, and solving the problem of large blast furnace smelting and large amount of iron tapping, resulting in a large amount of tapping work in front of the furnace. It improves the transportation capacity of molten iron in front of the furnace, reduces the area of the blast furnace casthouse and simplifies the railway layout.

4. The movable nozzle has simple process and low price. After the damage, it can be re-welded and re-cast with refractory materials for reuse, which can greatly reduce the cost of spare parts.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a top view of the lower case of the present invention.

detailed description

Below in conjunction with accompanying drawing, the utility model is described in detail below.

As shown in the figure, a movable nozzle for placing residual iron in the main ditch of a blast furnace includes a casing 1, wherein the casing 1 is a hollow channel structure, and a refractory castable lining 2 is arranged inside the casing 1, and a refractory castable lining 2 is arranged inside the casing 1. 1 The top is symmetrically provided with hoisting earrings 4, and a U-shaped opening 5 is arranged on one side of the upper end of the housing. The opening 5 is located in the middle of the hoisting earrings 4. A steel wire rope is fixedly connected to the hoisting hook of the crane in front of the furnace, and finally through the seamless connection between the upper opening 5 of the shell and the fixed nozzle, so that the bottom of the movable nozzle is directly aligned with the mouth of the molten iron tank, so that molten slag and iron cannot flow into the tank In addition, the middle part of the shell 1 is funnel-shaped, and the shell includes an upper shell 11, a middle shell 12, and a lower shell 13, and the upper shell 11, the middle shell 12, and the lower shell 13 are connected into one body by welding. The height of shell 11 is 1150mm, the height of middle shell 12 is 700mm, and the height of lower shell 13 is 1100mm. It is circular, and a number of herringbone steel bars 3 are evenly distributed and welded on the inner wall of the shell 1. After the refractory castable slurry is poured, the refractory castable is firmly grasped by the herringbone steel bars 3 .

When in use, first set the pouring mold in the shell 1, then pour the refractory castable slurry into the gap between the shell 1 and the mold, and insert a vibrating rod to keep vibrating, and firmly grasp the refractory castable through the herringbone steel bar 3 , and finally dry the refractory castable with a gas flame, tie two steel wire ropes to the two hoisting earrings 4 on the movable spout, and naturally align and align with the fixed spout. The nozzle is fixedly connected with the fixed nozzle, and after use, just remove the movable nozzle with a crane.

The above descriptions are only embodiments of the present utility model, and are not intended to limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the description of the utility model and the contents of the accompanying drawings, or directly or indirectly used in other Related technical fields are all included in the patent protection scope of the present utility model in the same way.

Claims (6)

1. A movable flow nozzle for putting residual iron in the main ditch of a blast furnace, comprising a shell, characterized in that: the shell is a hollow channel structure, a refractory castable lining is arranged in the shell, and a symmetrical castable is arranged on the top of the shell. The hoisting earring is provided with a U-shaped opening on one side of the upper end of the shell, and the opening is located in the middle of the hoisting earring. 2. The active flow nozzle for placing residual iron in the blast furnace main ditch according to claim 1, characterized in that: the middle part of the shell is funnel-shaped, and the shell includes an upper shell, a middle shell and a lower shell, and the upper shell, the middle shell The shell and the lower shell are connected into one body by welding. 3. The movable nozzle for placing residual iron in the blast furnace main ditch according to claim 2, characterized in that: the cross-sections of the upper shell and the middle shell are both square. 4. The movable nozzle for placing residual iron in the blast furnace main ditch according to claim 2, characterized in that: the channel at the upper end of the lower shell is square, and the channel at the end is circular. 5. According to any one of claims 2-4, the blast furnace main ditch movable nozzle for placing residual iron is characterized in that: the height of the upper shell is 1150mm, the height of the middle shell is 700mm, and the height of the lower shell is 1100mm . 6. The movable nozzle for placing residual iron in the main ditch of a blast furnace according to any one of claims 1-4, characterized in that: a number of herringbone steel bars are evenly distributed and welded on the inner wall of the outer casing.