JPS5845767Y2 - Slag granulation equipment for slag manufacturing equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a slag granulation device for a slag production facility that is connected to a slag discharge facility such as a blast furnace or an open hearth.
In particular, the amount of slag discharged from the slag discharge equipment is adjusted in the slag gutter and flowed, and the number of operating water pumps is set to correspond to the flow rate of the slag discharged, and cooling water is supplied. The present invention relates to a slag granulation device for a slag production facility, in which the quality of the molten slag is made as uniform as possible by making the ratio of the flow rate of the slag and the amount of cooling water constant.

Generally, the molten metal in a blast furnace or open hearth contains slag, but because this slag has a lower specific gravity than the molten metal, it floats to the upper layer of the molten metal and easily enters the molten metal. Conventionally, the slag is sent to a slag recovery or regeneration facility (for example, a slag manufacturing facility).

The uses of this slag vary depending on the treatment method used during cooling, such as slow cooling or water cooling (quenching).

For example, in slow cooling, it is used as a substitute for crushed stone for civil engineering work, and in water cooling, it is used as a vitreous fine powder, so-called water slag, as a raw material for firing Portland cement and the like.

Conventionally, equipment was used to granulate slag by pouring a large amount of water on it.
In other words, the slag granulation device includes a slag gutter connected to a slag discharge facility, a cooling water supply section provided downstream of this slag gutter, and a slag granulator connected to the downstream end of the slag gutter. It consists of a gutter.

By the way, an important parameter for obtaining molten slag with uniform properties is the water supply ratio (hereinafter referred to as water ratio) to the amount of slag.

The allowable range of this water ratio is the lower limit (this is called the optimal water ratio)
There is a wide range of upper limits as long as the maximum flow rate is maintained, so in the cooling water supply section, the maximum flow rate of slag flowing through the slag gutter is estimated in advance, and the number of water pumps in operation is changed accordingly.
The amount of cooling water supplied was determined.

However, the amount of slag discharged from slag discharge equipment such as blast furnaces fluctuates considerably over time, and especially when the amount of slag discharge decreases significantly, excess water is supplied and slag (slag granulation) occurs. Sprinkle water on the slag to granulate it.

The properties such as the toughness of the amount of slag obtained after this process are not uniform, and the power and cooling water for the water supply pumps (multiple units are installed in parallel, and the displacement of one unit reaches several tens of tons per minute) is wasted. As a result, it was consumed.

Furthermore, when the amount of slag discharged exceeds a predetermined maximum value, there is a problem in that the amount of water supplied is insufficient and the quality of the slag finally obtained through subsequent steps becomes extremely uneven.

The present invention was developed in view of the above problems and to solve this problem.The purpose of this invention is to install a partition upstream of the cooling water supply port of the slag gutter to block the flow of molten slag in the gutter. The slag can be discharged from the slag discharge equipment by providing a plate that can be raised and lowered freely, and by making the raising and lowering position of this partition plate variable in multiple stages and by matching the raising and lowering position of this partition plate with the number of operating water pumps. Cooling water is supplied to the slag at a constant rate regardless of the fluctuation in the amount, thereby ultimately obtaining a water slag of constant quality, and reducing uneconomical power loss costs due to excessive water supply from the water supply pump. Provides a slag granulation device for slag manufacturing equipment.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a side sectional view of the slag granulation apparatus according to the present invention, and FIG. 2 is a partial perspective view of the periphery of the partition plate in FIG. 1 taken along the line A--A.

As shown in FIG. 1, the slag granulation device 1 includes a slag discharge facility (
A slag gutter 2 that guides the slag S discharged from the slag (not shown) to the stirring tank 5, and a partition provided in the middle of the slag gutter 2 so as to be able to rise and fall freely so as to block the flow of slag in the gutter 2. A cooling water supply port 4 that supplies cooling water into the gutter 2 between the partition plate 3 and the stirring tank 5, and a plurality of units connected in parallel to the cooling water supply port 4. It is equipped with a water supply pump 24.

In the following description, the gutter from the slag discharge equipment to the cooling water supply port 4 will be referred to as a slag gutter 6a, and the gutter from the cooling water supply port 4 to the stirring tank 5 will be referred to as a water crushing gutter 6b.

A partition plate 3 provided in the middle of the slag gutter 2 as shown in Fig. 2
The guide groove 8 is provided by using the side walls 7 at opposite positions in the slag gutter 2 formed in a U-shaped cross section, or by adding a new member to the side wall 7 that follows the shape of the gutter 2. , this guide groove 8
It is provided so that it can be raised and lowered freely so that it is engaged with the inside.

The partition plate 3 is formed in the shape of a rectangular parallelepiped, and a heat-resistant material 12 such as fire-resistant bricks or fire-resistant castable is stretched to an appropriate thickness on the outer peripheral surface 11, and a framework made of steel material 14 or the like is placed inside the partition plate 13 to form a so-called heat-resistant material. Formed like a protective wall.

A hanging fitting 15 formed to hang a hook or the like is provided on the top of the partition plate 3.

A hoist 16 having a lifting function is provided on the vertical extension line of the hanging fitting 15, and a rope or chain 17 (hereinafter referred to as chain) from this hoisting machine 16 is suspended and latched to the hanging fitting 15. It is set in the same position.

Cooling water supply port 4 provided between the slag trough 2 and the stirring tank 5
is formed using a blow-blown box 10 in the illustrated example.

This blowing box 10 is located above the gutter 2 and includes a space 18 of an appropriate size, and a number of nozzle-shaped holes 19 are provided on the lower surface of the space 18. .

Further, a main pipe 21 penetrating through the space 18 is attached to the upper part 20 of the blowing box 10.

This main pipe 21 is connected to a plurality of branch pipes 23, 23 and extended to the water tank 22, and each branch pipe 23 on the way
, 23 are provided with water supply pumps 24, 24, . . . .

The water supply pumps 24, 24... each have an electric motor 2.
5.25... is attached.

The operating switch for the electric motor 25, 25 is provided in correspondence with the operating switch for the hoist 16 in the illustrated example.

In the above embodiments, the shape of the slag trough 2 was formed to have a U-shaped cross section, but the shape is not limited to this, and it may be formed into a curved shape, for example. In this case, the shape of the partition plate 3 also has this shape. Although the upper part of the gutter 2 is open, it is of course possible to close it by hanging a lid or the like at an appropriate position.

Furthermore, in the embodiment, the sliding surface of the partition plate 3 facing the guide groove 8 side is provided with an appropriate gap from the guide groove 8;
During this time, measures may be taken to prevent the infiltration of molten slag S, for example, by installing a sealing member in the guide groove 8.
In addition, when shielded or without a sealing member, molten slag S
It goes without saying that rollers or the like may be provided on the sliding surface of the partition plate 3 to facilitate the lifting and lowering operations if the infiltration of the partition plate 3 can be prevented.

Furthermore, in the embodiment, the operation switches for the hoist 16 and the electric motor 25 are provided so as to be interlocked with each other, but this can be done in either automatic or manual mode, that is, interlocking is not necessarily required. It is something.

Next, the operation of the present invention will be explained.

The slag S contained in the molten metal in the blast furnace or open hearth is discharged from the furnace and guided to the slag tap trough 2 .

Here, the amount of slag S discharged from the furnace is appropriately assumed, and the opening level of the partition plate 3 is set in accordance with this amount.

That is, as shown in FIG. 2, the raising and lowering positions of the partition plate 3 are set in a plurality of stages (three stages in the illustrated example), so the partition plate 3 is raised and lowered by the hoist 16 according to the set positions.

The raising and lowering of the partition plate 3 is achieved by winding up the chain 17 by the operation of the hoist 16, and as the chain 17 is hoisted up, it is guided by the guide groove 8 and raised to move up and down through multiple opening levels L1. L2. L3...
・Variably adjusted.

The adjusted molten slag S in the slag gutter 2 passes through the gap between the bottom of the partition plate 3 and the upper surface of the gutter 2 and flows to the downstream part 2a.

Here, if the molten slag S that changes every moment and flows with respect to the assumed opening level accumulates upstream of the partition plate 3, increase the opening level and raise the partition plate 3 to L2°L3, for example. Operate so that the slag S flows smoothly.

Following the operation of the partition plate 3, the number of water supply pumps 24 in operation is changed, and the amount of cooling water blown out from the blowing box 10 is also changed.

The amount of cooling water for the number of operating water pumps 24 and the amount of slag S passing through at the ascending and descending positions of the partition plate 3 are set to be an optimum water ratio.
The flow of slag S that has passed at a constant flow rate flows down the gutter 6a, and an optimum amount of cooling water W is applied to the slag S that has entered the blowing box 4 provided downstream of the gutter 6a. It will be done.

Here, the slag S is pulverized, that is, granulated or atomized by the quenching action of the cooling water W, and is guided through the fracking gutter 6b without being accompanied by the cooling water, and is passed through the stirring tank 5 and below. You will be swept away.

As described above, according to the present invention, a partition plate is provided upstream of the cooling water supply port of the slag gutter so as to be movable up and down so as to block the slag in the gutter, and the vertical position of this partition plate is freely variable in multiple stages. By matching the vertical position of this partition plate with the number of water supply pumps in operation, cooling water is supplied at a constant rate into the slag regardless of fluctuations in the amount of slag discharged from the slag discharge equipment, ensuring quality. It is possible to obtain a constant amount of molten slag, and also to reduce the uneconomic power loss cost due to excessive water supply from the water pump, completely eliminating the disadvantages in operating the slag equipment.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a side cross-sectional view of the slag granulation device according to the present invention, and FIG. 2 is a partial perspective view taken along arrow A-A around the partition plate in FIG. It is a diagram. In the figure, 2 is a slag gutter, 3 is a partition plate, 4 is a cooling water supply port, 24 is a water supply pump, and S is a slag.

Claims (1)

[Scope of utility model registration request] A slag gutter that guides the slag discharged from the slag discharge equipment;
A cooling water supply port provided in the middle of this slag gutter and supplying cooling water into the slag flowing inside the slag gutter, and a plurality of water supply pumps connected in parallel to this cooling water supply port. In a slag granulation device for a slag production facility, which is equipped with a slag granulation device that sprays a large amount of water on the slag to granulate it, the slag in the slag is placed upstream of the cooling water supply port of the slag gutter. A partition plate is provided so as to be movable up and down so as to block the flow, and the up and down position of the partition plate is freely variable in multiple stages, so that the up and down position of the partition plate can be changed;
The slag is characterized in that the number of the pumps in operation corresponds to the number of slags in operation, so that cooling water can be supplied into the slag at a constant ratio regardless of fluctuations in the amount of slag discharged from the slag discharge equipment. Slag granulation equipment for manufacturing equipment.