JPH0657258A - Coal briquette for production of metallurgical coke - Google Patents

Abstract

PURPOSE:To shape a coal briquette for the production of formed coke so as to decrease the loss of pressure of passing air across the shaft furnace. CONSTITUTION:A coal briquette for the production of metallurgical coke produced by briquetting pulverized coal under an applied pressure so that it may have at least one protrusion in a part of it, and another coal briquette for the production of metallurgical coke so that it may have at least one ridgy protrusion in a part of it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shape of a forming coal for producing a forming coke for metallurgy.

[0002]

2. Description of the Related Art In a pig iron making process using a blast furnace method, the air permeability maintaining function is an important function of coke, in addition to the functions as a reducing agent, a heat source fuel, and a liquid permeability maintaining spacer. From the viewpoint of maintaining the air permeability, it is an important issue to produce a coke having a large particle size and a large porosity when filled. Generally, in the case of conventional chamber furnace coke, a dry distillation method is used in which the pulverized coal packed bed is heated in a large carbonization chamber.Because of the restrictions on temperature conditions, the coke shape becomes irregular. The degree of freedom in controlling the particle size is also small.

[0003]

As compared with blast furnace coke, in the case of molded coke, the size and shape of the forming coal used as a raw material can be changed relatively easily, and the degree of freedom in controlling the particle size and shape of coke can be controlled. Is big.

The object of the present invention is to manufacture a molded coke in which the porosity at the time of filling the blast furnace is increased in order to reduce the ventilation resistance in the blast furnace, based on the point that the shape of the molded coke can be arbitrarily controlled. It is to present the shape of the charcoal for making.

[0005]

[Means and Actions for Solving the Problems] In order to reduce the ventilation resistance when the coke is filled in the blast furnace, it is an effective means to make the coke shape having large unevenness so that the porosity becomes large during the filling. On the other hand, if the shape is extremely rough, it will not be possible to apply a sufficient load during the manufacture of shaped coal, or problems such as pulverized coal remaining in the molding mold will occur. It is important to select the uneven shape.

As a result of examining both the air permeability of the molded coke packed layer and the moldability of the molded coal as described above, the shape of the molded coal for metallurgical coke production having a convex portion as described below is excellent. Revealed. That is, a coal for producing metallurgical coke, which is produced by pressure-molding pulverized coal, and first of all, a coal for producing metallurgical coke having a shape having one or more convex portions in a part thereof as shown in FIG. Alternatively, it is a forming coal for metallurgical coke production, which has a shape having one or more ridge-shaped convex portions at a part thereof as shown in FIG.

By using the briquette charcoal having such a shape, it becomes possible to increase the porosity at the time of filling the molding coke and to ensure sufficient air permeability when used in the blast furnace.

[0008]

【Example】

Example 1 A plane-symmetric pillow-shaped forming coal as shown in FIG. 1 was formed by a double roll forming machine. The dimensions at that time are shown in FIG. In the case of forming coal having a convex portion in which the vertical length l, the horizontal width w, and the height H of the convex portion are 1/2 of the vertical length L, the horizontal width W, and the height D of the forming coal having no convex portion, respectively. It was confirmed that the bulk density at the time of filling the molded product was reduced by about 12% and the porosity at the time of filling was increased by about 7% as compared with the unformed normal-shaped molded coal.

Example 2 A plane-symmetric pillow-shaped forming coal as shown in FIG. 3 was formed by a double roll forming machine. The dimensions at that time are shown in FIG. The width l and the height H of the ridge-shaped convex portion are 1/2 of the width L and the height D of the shaped coal having no convex portion, respectively. The bulk density when filling the molded product is reduced by about 10% compared to the molded coal having the shape of
It was confirmed that the porosity at the time of filling increased by about 5%.

[0010]

EFFECTS OF THE INVENTION By filling the blast furnace with the shaped coal having concave portions according to the present invention, the porosity can be increased and the ventilation resistance can be reduced as compared with the case of the conventional shaped coal.

[Brief description of drawings]

FIG. 1 is a view showing an example of a shaped charcoal shape with a protrusion according to the present invention.

FIG. 2 is a view showing the dimensions of the molded coal with a convex portion in FIG.

FIG. 3 is a view showing an example of the shape of a briquette charcoal with ridge-shaped projections of the present invention.

FIG. 4 is a view showing the dimensions of the briquette charcoal with ridge-shaped projections in FIG. 3;

[Explanation of symbols]

 L ... Width of forming charcoal D ... Height of forming charcoal l ... Width of ridge-shaped convex portion H ... Height of ridge-shaped convex portion

Claims (2)

[Claims] 1. A forming coal for metallurgical coke production, which is produced by press-molding pulverized coal, which is a forming coal for metallurgical coke having one or more protrusions. 2. A forming coal for metallurgical coke production, which is produced by pressure-molding pulverized coal, wherein the forming coal for metallurgical coke production has one or more ridge-shaped projections.