Production method of metallurgy coke

Abstract

The invention discloses a production method of metallurgy coke. The production method comprises a coal blending step and a coking step, and specifically comprises the following steps: mixing coals from a coal blending groove so as to obtain blended coal, transporting 10% to 40% of the mass of the blended coal into a hot-pressing device to carry out hot pressing so as to obtain hot-pressed blocks, crushing the hot-pressed blocks, blending the crushed blocks with the rest blend coal, and finally transporting the mixture into a coke oven to carry out coking; wherein the hot-pressing temperature is 300 to 650 DEG C, the hot-pressing pressure is 5-30 MPa, and the stay time under the hot-pressing operation is within 5 seconds. The technology operation method is simple and practical, effectively improves the coke quality on the basis that the ratio of the blended coal is not changed, reduces the reactivity of coke, increases the coke strength after the reactions, protects the high-quality coke, and reduces the coke production cost.

Description

technical field [0001] The invention belongs to the field of coal processing, and relates to the production technology of coal blending and coke, in particular to a production method of metallurgical coke. Background technique [0002] Although my country has a complete range of coking coal types, the distribution is very uneven. Coking coal and fat coal are the main types of coal for coke production. However, in China's coking coal resources, coking coal only accounts for less than 24%, and fat coal and gas-fired coal only account for 24%. About 13%, remove the part with high ash, high sulfur, difficult to wash, and cannot be used for coking. High-quality coking coal and fat coal account for less than 6% and 3% of the proven coal resource reserves. At present, the shortage of high-quality coking coal and fat coal has become an obstacle for some enterprises to ensure the quality of coke. [0003] In order to achieve the purpose of improving coke quality in the conventional b...

AI Technical Summary

Problems solved by technology

The weakly caking coal used in the present invention is the weakly caking coal in the specified area, and the application of this coal type in other remote areas will lead to an increase in transportation costs. Therefore, this scheme is limited by its wide application

[0006] In addition to some additional binders, the operation process of tamping coking is also relatively complicated.

In addition to the necessary tamping operation equipment, it also includes a preheating device for coal pretreatment before tamping operation, a mixing device with a binder process, and more importantly, a dust removal device. Coal cakes are pushed into the carbonization chamber with the furnace door on the machine side open. If dust removal measures are not taken, a large amount of smoke and raw coal gas will escape, and the pollution to the environment is more serious and worse than that of the top-loaded coke oven.

In addition, due to the current development of coke ovens in the direction of large-scale, the height of the tamped briquettes is limited by technical conditions. If the height of the briquettes exceeds 5.5 meters, the stability of the briquettes will be seriously affected and it will easily collapse.

Once the briquettes collapse, a large amount of pulverized coal will be piled up on the side of the coke pusher, making the coke pusher unable to walk on the original driving lane, which will affect the coal loading and coke push work in other carbonization chambers

Therefore, the tamping coking process in the new coking process that changes the coke quality is not only affected by factors such as complex process and long process, but also the height of tamping briquettes cannot meet the development needs of large-scale coke ovens

[0007] In addition to the shortcomings of complex process flow, many equipments and large investment in the tamping metallurgical coke production process, this process also requires adjusting the moisture content of the blended coal to about 8%, which increases the water transfer process and increases the difficulty of equipment operation; In the coal blending coking process, in addition to heating the coal and adjusting the water process, an additional binder blending process is required, which increases the process operation process and reduces the reliability of equipment operation

[0008] The blended coal coking process requires a certain proportion of binder, which increases its cost accordingly. At the same time, the reliability of the operation of the mixing device is affected due to the addition of the binder; although the blended coal coking process increases the amount of coal into the furnace, However, the coking time also increases correspondingly, which does not increase the output of the coke oven; the expansion pressure of the coal cake in the furnace on the furnace wall increases during coking with the increase in the amount of coal briquettes, which will affect the life of the coke oven. The increase of coke will lead to the increase of coke pushing current. If it is a strong cohesive forming coal material, the coke pushing current will rise sharply, which puts forward higher requirements for the stable operation of the equipment.

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