Method for improving cold strength of coke

Abstract

The invention discloses a method for improving the cold strength of coke, which comprises the following steps: 1, gas coal crushing: gas coal with the granularity of less than 6 mm from a production plant is fed into a crusher for crushing, performing screening analysis on the granularity of the gas coal after crushing according to the requirement of the proportion of the granularity of less than3 mm in the crushed gas coal to be 48-53%; 2, blending of blended coal: the crushed gas coal is blended with 1 / 3 coking coal, fat coal and lean coal according to the requirements of coal blending, themass ratio of the gas coal in the whole blended coal is 25.5-27%, the ash content Ad of the blended coal is 8-10%, and the volatile matter VMd of the blended coal is 26-28%; 3, crushing and mixing ofthe blended coal: the blended coal is added into a crusher for repeated crushing, the groove spacing of the crusher is 3-4 mm, and the mass ratio of the blended coal with the particle size smaller than 3 mm after crushing is 84-86%; and 4, moisture adjustment and preparation of high-strength coke.

Description

technical field [0001] The invention belongs to the technical field of coke quality control for high-temperature pyrolysis of coal, and in particular relates to a method for improving the cold strength of coke. Background technique [0002] In recent years, the rapid expansion of coke production capacity has led to a tight supply of coking coal. In addition, due to the current large-scale blast furnaces in iron and steel enterprises, the requirements for coke quality and stability are getting higher and higher, and coking coal resources are strongly bonded. Natural coal is less and less, this contradiction is particularly prominent in our country. How to rationally utilize coal resources to meet the needs of coking production is a long-term task. With the slowdown of the national economic growth rate in 2016, the serious overcapacity of my country's coking industry is highlighted. Only by improving coal blending coking technology, increasing coke production and quality, and...

AI Technical Summary

Problems solved by technology

[0005] The Chinese patent application whose publication number is CN103184058A proposes a method that is beneficial to the cold strength of coke. This method requires that the Aurora expansion degree of fat coal is greater than 150%, the proportion of fat coal is 10-20%, and the gas fat coal is required. The percentage of fat coal with a volatile content greater than 34% should be less than 10% to obtain coke with better cold strength, but this method is more complicated and has high requirements on the coal quality index of fat coal, and gas fat coal in coal blending It is difficult to control the percentage of the sum of fat coal with volatile content greater than 34% is less than 10%

This makes the method less practical

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