Coking coal blending method of wide carbonization chamber coke oven

Abstract

The invention discloses a coking coal blending method of a wide carbonization chamber coke oven. The method comprises a step of blending various single coking coals, wherein each single coking coal comprises the following components in percentage by weight: 16-25% of lean coal and meager lean coal, 10-20% of fat coal 1#, 17-29% of 1 / 3 coking coal, 15-20% of coking coal 1#, 6-20% of coking coal 2#, 5-10% of coking coal 3#, 6-10% of gas-fat coal and fat coal 2# and the balance of other random available coking coal of which the volatile component content Vdaf is less than or equal to 35%; the maximum Gieseler fluidity of the compound coal is 600-1,400ddpm; and the volatile components account for 24-27%. The method disclosed by the invention effectively reduces the coal preparation cost, overcomes adverse impact on the high-temperature flowing property of the coking coal caused by the heating speed reduction in a coking process of the wide carbonization chamber coke oven, effectively reduces the graphite accumulation speed on the oven top and improves the coke quality and the coke output.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and coking, and in particular relates to a coking coal blending method for coke ovens with wide carbonization chambers. Background technique [0002] Due to the influence of coking coal resource procurement channels, and in order to stabilize the quality of coke, coking enterprises generally do not make significant adjustments to the use ratio of gas coal, gas fat coal, fat coal, 1 / 3 coking coal, coking coal and lean coal. Adjustment. Traditional coal blending technology uses a large proportion of coking coal in order to produce high-quality coke, and the blending ratio of coking coal is as high as 60%. Lean coal and lean coal have poor cohesiveness and basically do not have high-temperature flow properties, so the blending ratio in coking coal blending is relatively low ( generally less than 8%) or not even used. [0003] The 7.63-meter coke oven is a super-large coke oven with a wide carbon...

AI Technical Summary

Problems solved by technology

Since the temperature rise rate of the 7.63-meter coke oven is about 26% slower than that of the traditional 6-meter coke oven during the carbonization of indoor coal materials, especially the coking process of the coal material in the center of the carbonization chamber, continue to carry out coal blending and coking according to the coking coal blending method of the 6-meter coke oven. Then the high-temperature fluidity of the blended coal will be significantly worse, so that the blended coal cannot be fully mixed among different coal types during the heating and coking process, and coke with uniform quality cannot be obtained.

In addition, when the volatile content of the blended coal in the carbonization chamber is high, the amount of gas produced by heating will be large. Since the gas is easily pyrolyzed to generate graphite at a high temperature of more than 850°C, the 7.63-meter coke oven adopts three-stage heating , the temperature of the top space of the carbonization chamber is more difficult to control than that of a 6-meter coke oven, and the temperature of the top space is generally about 40°C higher than that of a 6-meter coke oven. The top of the coke oven with high volatile content has severe graphite formation. Some coking plants have 30 coke ovens per month and need to be fired for 4 to 5 hours without coal loading.

Images