JPH0797576A - Molded coke manufacturing method - Google Patents

Abstract

PURPOSE:To obtain a shaped coke little in the generation of fine powder, excellent in cold strength, abrasion resistance and oxidation resistance, and suitable for metallurgy, etc., in a high yield by adding a binder such as coal tar to fine coal, kneading and shaping the mixture, and subsequently carbonizing the obtained briquett under a specific condition. CONSTITUTION:All or a part of a carbonization gas discharged from the upper part of a carbonization over 1 is introduced into the carbonization oven through a cooling gas tuyere disposed at the lower part of the carbonization oven 1 as a gas for cooling the red heated coke in the carbonization oven 1, and the carbonization gas is finally heated to 800-900 deg.C. The briquett obtained by adding a binder such as coal tar, pitch or petroleum asphalt to fine coal and subsequently kneading and shaping the mixture is subsequently continuously carbonized to obtain the objective shaped coke. Hydrocarbons such as coal tar and methane in the carbonization gas are decomposed into thermally decomposed carbon by their thermal decomposition in the heating process., and the produced carbon is made to adhere to the surface of the shaped coke and into the pores of the coke for filling the fine cracks, thereby improving the strength and acid resistance of the coke.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a forming coke for metallurgy, in which a dry distillation gas discharged from the upper part of a dry distillation furnace for forming coke is used as a cooling gas for red hot coke in the furnace. The present invention relates to a method for producing a molded coke capable of improving cold strength and wear resistance of coke.

[0002]

2. Description of the Related Art Generally, most of the coke is produced in an upright external heating chamber furnace, but the following problems occur. (1) Strong coking coal is required as raw coal. (2) Low productivity.

(3) A large amount of capital investment is required. (4) There is an environmental problem due to the release of dust. Under such circumstances, R & D for continuously producing coke in an internal heating carbonization furnace from coking coal mainly made of non-caking coal and slightly coking coal that are abundant on the earth. Has been done.

For example, a lot of research has been conducted on manufacturing equipment including a dry distillation furnace having two or more tuyere and its peripheral technology, and research on a method for manufacturing briquette. Therefore, a conventional method for producing a molded coke by the above-mentioned carbonization furnace will be described with reference to FIG. 2 showing an outline of the carbonization furnace. First, shaped coal mainly made of non-caking coal or slightly caking coal is charged from the upper hopper 2 of the carbonization furnace 1 and heated by the low temperature gas heater 3 while descending toward the lower part of the carbonization furnace. The generated low temperature gas is blown into the briquette from the low temperature gas tuyere 4, then the high temperature gas heated by the high temperature gas heater 5 is blown into the briquette, and finally in the vicinity of the high temperature tuyere 6.
It is heated up to 850-1000 ℃. When it further descends, it is cooled by the cooling gas introduced from the cooling gas tuyere 9.
During this carbonization process, the volatile components contained in the briquette are gasified,
As coking progresses, hydrocarbons such as methane and ethane, hydrogen, and the like become the dry distillation gas 7 and are discharged from the upper part of the dry distillation furnace, cooled by the gas cooling device 8 and recovered.

[0005] Through this process, a molded coke is manufactured from the molded coal.

[0006]

However, the molding coke produced by the above-mentioned production method using coal tar obtained from a carbonization furnace as a binder in a forming coal has a problem in strength and is also resistant to oxidation. inferior. It is an object of the present invention to provide a method for producing a molding coke which is superior in strength and oxidation resistance to the molding coke obtained by the above method.

[0007]

The present invention is a coal tar,
After adding a binder such as pitch and petroleum asphalt to pulverized coal, kneading and forming the formed coal, and continuously dry-distilling the forming coal using a gas as a heating medium in a carbonization furnace to produce a forming coke for metallurgy. At this time, the whole or a part of the dry distillation gas discharged from the upper part of the dry distillation furnace is introduced from the lower part of the dry distillation furnace, which is a method for producing a molded coke.

[0008]

[Operation] According to the present invention, after adding a binder such as coal tar, pitch and petroleum asphalt to pulverized coal,
When the molding charcoal obtained by kneading and molding is continuously carbonized in a carbonization furnace using a gas as a heat medium to produce a coke for metallurgy, as shown in FIG. 1, from the top of the carbonization furnace 1. All or part of the discharged coal carbonization gas is introduced as a gas for cooling the red hot coke in the furnace through a cooling gas tuyere 9 installed in the lower part of the carbonization furnace 1.

The amount of the cooling gas introduced can be adjusted by opening / closing the valve 10. As a result, the dry-distilled gas is finally heated to 800 to 900 ° C., so that coal tar and hydrocarbons such as methane in the dry-distilled gas are pyrolyzed during the temperature-raising process to become pyrolytic carbon, forming It adheres to the surface and pores of the coke and fills the pores and fine cracks of the molding coke, so that the coke strength and oxidation resistance can be increased.

[0010]

EXAMPLES Examples of the present invention will be described below with reference to the tables. First, the production of shaped coal will be described. 20 wt% of strong coking coal was used as the raw material coal, and coal was blended so that the weight of volatile matter was also 20 wt%.

A coal pitch having a softening point of 40 ° C. obtained from a chamber furnace type coke oven was used as a binder. Blended coal at 90 ℃ 2
After preheating for a period of time, the pitch which was heated and melted at 100 ° C. was added to the blended coal by 8% by weight. Immediately after the pitch was added, the mixture was kneaded for 6 minutes with a mix muller kneader, and then using a double roll molding machine, 100-110 cc of coal having a specific gravity of 1.2 was produced under the molding conditions of a roll peripheral speed of 5 rpm and a molding reaction force of 4 t.

Next, the shaped charcoal was subjected to dry distillation by the dry distillation method of the present invention. This condition is shown in Table 1.

[0013]

[Table 1]

The dry distillation gas 7 discharged from the upper part of the dry distillation furnace 1 is adjusted as the forming coke cooling gas into the lower part of the dry distillation furnace 1 by adjusting the opening and closing of the valve 10 to obtain a cooling gas flow rate ratio of 3.0. Also, the cooling gas flow rate ratio is 1.
5 was designated as Example 2. In addition, a comparative example of the molded coke obtained by the conventional method is also shown. The gas flow rate ratio (Nm ³ / kg-coal) shown in Table 1 is [gas flow rate (Nm ³ / h)] / [charged coal (kg-coal / h)].

However, when the dry distillation gas 7 is not directly introduced into the furnace, C gas is introduced as a cooling gas. Table 2 shows the results of evaluation of the quality of the molded coke obtained under the above-mentioned carbonization conditions for the drum strength of the molded coke and the strength of the molded coke after the CO ₂ reaction.

[0016]

[Table 2]

The drum strength of the molding coke is 5 kg.
The molded coke of was rotated 150 times with a drum tester, and the ratio of the amount of coke having a particle size of # 15 mm or more to the total amount of coke is shown. In addition, the strength of the molding coke after the CO ₂ reaction means that 5 kg of molding coke is charged into the reaction tester and the temperature is 1000 ° C × 3h.
The above drum test was performed on the sample after reacting at a CO ₂ gas flow rate of 20 l / min, and
The coke amount ratio of 15 mm or more.

As is clear from Table 2, in Examples 1 and 2, the drum strength and the strength after CO ₂ reaction were higher than those of the comparative examples, and the quality of the molding coke produced by the method of the present invention was much higher than that of the comparative examples. You can see that The difference in strength in Examples 1 and 2 is the difference in the gas flow rate for forming coke cooling (flow rate of dry distillation gas introduced into the furnace), and due to the difference in the amount of hydrocarbons such as coal tar and methane that undergo the thermal decomposition reaction, It varies somewhat depending on the amount of pyrolytic carbon deposited on the surface of the molded coke.

[0019]

As described above, according to the method for producing a molded coke of the present invention, the strength of the molded coke is remarkably high and the generation of fine powder is small as compared with the quality of the molded coke produced by the conventional method. It is possible to obtain a molding coke having good oxidation resistance and good oxidation resistance.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an outline of a dry distillation furnace used in the method of the present invention.

FIG. 2 is an explanatory view showing an outline of a dry distillation furnace used in a conventional method.

[Explanation of symbols]

 1 Dry distillation furnace 2 Upper hopper 3 Low temperature gas heater 4 Low temperature gas tuyere 5 High temperature gas heater 6 High temperature gas tuyere 7 Carbonization gas 8 Gas cooling device 9 Cooling gas tuyere 10 Piping valve 11 Cooling gas discharge tuyere 12 Gas cooler

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Daiichi, Kawasaki-cho, Chuo-ku, Chiba, Chiba Prefecture, Kawasaki Steel Co., Ltd. Technical Research Headquarters (72) Inventor, Koji Hanaoka 1 Kawasaki-cho, Chuo-ku, Chiba Address: Kawasaki Steel Corporation Technical Research Division

Claims (1)

[Claims] 1. A coal briquette obtained by adding a binder such as coal tar, pitch and petroleum asphalt to pulverized coal and then kneading and molding the mixture to continuously dry-distill the coal using a gas as a heat medium in a carbonization furnace. A method for producing a forming coke, characterized in that, when producing a forming coke for metallurgy, all or part of a dry distillation gas discharged from an upper part of the dry distillation furnace is introduced from a lower part of the dry distillation furnace.