A production process of bulk tamping coke

Abstract

The invention discloses a production process of bulk rammed coke. The blended coal required for the production of bulk rammed coke is prepared from the following components in mass percentage: high volatile content and high shrinkage coal H 煤 20%~30%, medium volatile and medium shrinkage coal M 煤 48%~60% and low volatile non-shrinking coal L 煤 17%~22%; the production process of the bulk rammed coke specifically includes the steps of crushing, ramming, coking, and screening after coke quenching. The invention overcomes the defects of tamping coke technology, and the produced coke has large and uniform block size and high strength, combined with the selection of a single type of coal with reasonable shrinkage and the ratio, it will not cause excessive expansion of the blended coal, and during the coke pushing process There is also no difficulty in coke pushing, no damage to the wall of the coke oven, and the service life of the equipment is improved.

Description

technical field [0001] The invention relates to the technical field of coking in the coking industry, in particular to a production process of stamped coke. Background technique [0002] In 2019, the national output of tamped coke was 250 million tons, accounting for about half of the total machine coke production capacity; but currently tamped coke is mainly used in small blast furnaces, 2000m 3 The above-mentioned large-scale blast furnaces are seldom used. The main reason is that a large proportion of weakly caking coal or high-volatile coal is added to the tamping coke, and the quality of the tamping coke and the top-loaded coke with the same quality index are different. The large difference is mainly reflected in the high tamping coke density, low total porosity and apparent porosity, and poor matrix strength. In addition, due to the substantial increase in the bulk density of the tamped coal material, the cracks of the coke cake increased, the large coke above 60mm wa...

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Problems solved by technology

[0002] In 2019, the national output of tamped coke was 250 million tons, accounting for about half of the total machine coke production capacity; but currently tamped coke is mainly used in small blast furnaces, 2000m 3 The above-mentioned large-scale blast furnaces are seldom used. The main reason is that a large proportion of weakly caking coal or high-volatile coal is added to the tamping coke, and the quality of the tamping coke and the top-loaded coke with the same quality index are different. The large difference is mainly manifested in the high tamping coke density, low total porosity and apparent porosity, poor matrix strength, etc.

However, the above technologies still have the following problems: First, most of the above are based on the top-loaded coke oven process, and do not consider the special characteristics of high tamping coke density and large shrinkage stress; The proportion of coke fat coal in the coal blending is still relatively high, and the cost is high. The cost advantage of tamping coke has not been brought into play, and it has not been considered that if the proportion of coke fat coal is too high, the expansion pressure of the coal material will be too high, which will easily lead to production difficulties in coke pushing. Third, some technologies use indicators such as optical structure, inert capacity, fluidity, etc., and the operation is relatively complicated, so it is difficult to apply them well; fourth, most of them are based on coal blending technology, and have not been improved in coking production and operation

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