JPH07126656A - Method for hot-molding coal - Google Patents

Abstract

PURPOSE:To provide a method for producing coke by rapidly heating coal, hot-molding the produced caky coal, and subsequently caking the coal in a carbonization oven, capable of suitably controlling the expansion of the hot- molded products in the carbonization oven to smoothly melt-adhere the hot- molded products to each other in the carbonization oven for the production of the coke having a high strength. CONSTITUTION:In a method for producing coke for blast furnaces by rapidly heating coal, hot-molding the heated coal, and subsequently caking the hot- molded products in a carbonization oven, the hot-molded products are controlled to a volume of 1-100cm<3>, respectively, and subsequently carbonized.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a hot forming method for producing high strength coke.

[0002]

2. Description of the Related Art Conventionally, Journal of Fuel Society, Vol. 45, No. 472 (1966) p. As described in 575, the aim of the method of heating coal to hot mold it into briquettes and subjecting the obtained briquette to carbonization as it was was to produce coke. In this case, in order to obtain a high-strength molded coke, the swelling / cracking of the molded product is controlled by the compounding conditions, the size of the molded product, the dry distillation conditions, and the like. Compared to this, this process is
It is characterized in that coal is heated and hot-molded, and the hot-molded products are fused and agglomerated in a carbonization furnace to obtain coke. Therefore, it becomes possible to promote mutual fusion by swelling the molded product to some extent. However, if it expands too much, the furnace body will be damaged as the expansion pressure in the dry distillation furnace increases, and the coke obtained will have very many pores and weak strength.

[0003]

DISCLOSURE OF THE INVENTION According to the present invention, in a process in which coal is rapidly heated, hot-molded and then agglomerated in a carbonization furnace to produce blast furnace coke, the hot-molded products are mutually fused in the carbonization furnace. In order to obtain a high-strength coke, it is possible to control expansion and cracking that occur during the formation of coke.

[0004]

SUMMARY OF THE INVENTION The present invention is a process of rapidly heating coal, hot forming it and then agglomerating it in a carbonization furnace to produce coke for a blast furnace. In order to control the expansion and cracking that occur during the formation of coke, and to obtain high strength coke, an apparent density of 1.0
It is characterized in that the volume of the hot-formed product of 5 to 1.25 g / cm ² is 100 cc or less regardless of the shape of the hot-formed product.

[0005]

The inventors of the present invention have obtained apparent density of 1.05 to 1.25 g / cm ^{2 of} hot-molded molded product obtained by rapidly heating several kinds of coal.
In the range of, flake, briquette pillow type, briquette cylindrical type, concave briquette medium type,
There is a certain relationship between the volume of the molded product as shown in FIG. 1 and the swelling ratio after dry distillation up to 600 ° C. When the molded product volume exceeds 100 cc, the swelling ratio exceeds 20% and the shape of the molded product rapidly breaks. I found what happened.

In this case, as shown in FIG. 2, in the case of flakes or briquette pillow type, briquette cylindrical type, and briquette hollow concave type moldings, if the swelling rate exceeds 20%,
It was revealed that the coke obtained by agglomerating these at 1 to 20 ° C./min up to 1000 ° C. expanded, had many cracks, many pores, and low strength. Therefore, it was discovered that in order to finally obtain a high-strength coke in this process, the swelling ratio of the molded product must be suppressed to 20% or less. That is, it was found that by setting the volume of the molded product to 100 cc or less, the swelling ratio of the molded product was suppressed to 20% or less, and coke with high strength could be obtained.

A series of experiments from the rapid heating and hot forming of coal to the carbonization according to the present invention were carried out by the apparatus shown in FIG. In the figure, 1 is a carbonization furnace, 2 is a hopper,
3 is a charging port, 4 is an extruder, 5 is a rack, 6 is a coke bucket, 7 is a coke dry fire extinguisher (CDQ), 8 is a dryer, 9 is a preheater, 10 is a hot stove, 11 is a molding machine,
Reference numeral 12 represents a pre-chamber, and 13 represents a cooling chamber.
As for the swelling rate, the volume of the hot-molded product was raised from the hot-molding temperature (350 to 450 ° C., which depends on the type of coal and the mixing conditions) to 600 ° C. at 2 ° C./min, and then the volume was increased. It was measured and indicated as an increasing ratio of this volume to 600 ° C. with respect to the volume of the hot-molded product before carbonization.

The volume of the hot-molded product in this study is the outer volume including pores in the apparent density of 1.05 to 1.25 g / cm ² , and the hot-molded product is hot-molded. The volume measured after raising the temperature (from 350 to 450 ° C, which varies depending on the type of coal and blending conditions) to 600 ° C at 2 ° C / min is the outer volume including pores regardless of the apparent density. Is.

[0009]

[Examples] Ten kinds of coal blends were used in the apparatus shown in FIG.
° C. In rapid heating at 10 ⁴ ° C. / min, then, after hot working at 400 ° C., dry distillation to 1000 ° C. in the carbonization furnace. During hot molding, flakes are rolled compactor 1-5kg /
It was manufactured at a pressure of cm ² . Briquettes were manufactured by a briquette machine at a pressure of ² to 15 kg / cm ² .

[0010]

[Chemical 1]

[0011]

[Table 1]

[0012]

By carrying out the present invention, the volume of the hot-molded product is set to 100 cm ³ or less so that the hot-molded product undergoes extreme expansion and cracking during mutual fusion in the carbonization furnace to form coke. Can be suppressed, and high-strength coke can be stably obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing the relationship between the volume and the swelling rate of a hot-molded product,

FIG. 2 is a diagram showing the swelling rate and coke strength of a hot-molded product,

FIG. 3 is a schematic view of a coke manufacturing apparatus of the present invention.

[Explanation of symbols]

 1 dry distillation furnace 2 hopper 3 inlet 4 extruder 5 rack 6 coke bucket 7 coke dry fire extinguisher (CDQ) 8 dryer 9 preheater 10 hot air stove 11 molding machine 12 prechamber 13 cooling chamber

Claims (1)

[Claims] 1. A method for producing coke for a blast furnace by rapidly heating coal, hot-molding it and then agglomerating it in a carbonization furnace, wherein the hot-molded product has a volume of 1 to 100 cm ³ and is then carbonized. Hot forming method for coal.