Mixed fuel for blast furnace injection

Abstract

A mixed fuel for blast furnace injection belongs to the technical field of metallurgy. The average particle size of mixed coal is not more than 30 microns, and the mixed coal comprises low-temperature semi coke, and anthracite; the weight of the low-temperature semi coke accounts for 60-85% of the weight of the mixed coal, and the weight of the anthracite accounts for 15-40% of the weight of the mixed coal. The low-temperature semi coke is mixed with the anthracite, which neutralizes the low-temperature semi coke with a medium volatile content. The mixed coal has low explosibility, meets the requirements for coal injection safety, increases the ratio of medium volatile bituminite to a level of 85%, greatly decreases the ratio of expensive anthracite, and thus significantly reduces the cost. The mixed coal can be used as a fuel for blast furnace injection, and has a significantly increased combustion rate level.

Description

technical field [0001] The invention relates to a mixed fuel injected into a blast furnace, which belongs to the technical field of metallurgy. Background technique [0002] In order to meet the needs of blast furnaces to reduce the coke ratio, increasing the coal ratio is the primary task. With the increase of coal injection ratio and changes in the coal market, anthracite resources are increasingly tight, and the price of anthracite will show a trend of substantial growth. Reduce the proportion of anthracite in the mixed fuel and increase the amount of cheap bituminous coal. At present, the new coal injection system is affected by factors such as fluctuations in the oxygen content of the atmosphere, and the bituminous coal ratio level is equivalent to that of the old system, which is maintained at 35-40%, which cannot fully utilize the advantages of bituminous coal injection. Chinese patent "mixed fuel injected into the blast furnace" (application number: 200910312386.9)...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the deficiencies in the existing blast furnace injection fuel technology, the present invention develops a new mixed coal with medium volatile content, which can replace the currently used anthracite and bituminous coal, so that the volatile content of pulverized coal can reach the optimum level required for blast furnace smelting. State, overcome the defects of fluctuations in volatile components caused by fluctuations in the ratio of two or more types of coal, greatly reduce production costs, and open up new coal source reserves for blast furnace coal injection