Study On Compress Strength Of Coke For Blast Furnace In Hot State

The coke used in the production of the blast furnace has four roles as fuel, reducer, cementing agent and a framework sustaining the material. After adopting the technology of coal powder injection, the coke rate in the blast furnace is greatly reduced. The coal powder can replace the coke as fuel, reducer and cementing agent, but it can't replace the important use of coke as the framework in the blast furnace.With the development of the coal powder injection technology, the coke rate is declining and the burthen of coke is rising so that the running condition in the blast furnace has many changes. As general, those changes are avail to the running of blast furnace under the condition of low coal rate. For example, enlivening the hearth and providing a effective adjust-control means. But with the raising of coal rate, disadvantageous factors are more and more obvious. Eventually they will affect the normal running of the blast furnace. If some factor is developed malignantly and make the blast furnace not run normally, the factor will become as the limiting link to the ultimate coal rate.With the raising of the coal rate, the losing carbon rate of coke has a rising trend, accordingly the strength of coke will decline. When it is very serious, the coke will be broken because of not sustaining the pressure in the blast furnace. Accordingly, the coke will lose the function as the framework. This is one of the limiting links that determines the ultimate coal rate, which some practices (such as the industry trial of rich oxygen coal powder injection in Handan steel) have proved. Starting off from the unique function of coke in the blast furnace, it is very impossible that this point is the most important link. The key to the problem lies in the study of the coke anti-pressure strength in hot state with the different losing carbon rate. The difficulty of this kind of study lies in the failing of proper anti-pressure trail type equipment.This topic finishes the anti-pressure strength trail in hot state with the different losing carbon rate by the anti-pressure testing machine in hot state. The new machine is researched and made with adjustable atmosphere. Based on the study, the transaction between the coal rate and the hot strength of coke is researched and provide the theoretic basis for the further improving the coal rate and the study of ultimate coal rate. The mainly contents are as follows: (1) Studying the relationship between the coke strength and the temperature. Given a certain losing carbon rate of coke, the approximate inverse ratio is between the anti-pressure strength of coke and the temperature.(2) Studying the relationship between the coke strength and the losing carbon rate of coke. Given a certain temperature, the approximate inverse ratio is between the anti-pressure strength of coke and the losing carbon rate of coke.(3) Studying the law of running condition changes in the blast furnace after spraying the coal powder.(4) Studying the law of transaction between the coal powder injection and the anti-pressure strength of coke in hot state.(5) Discussing the measures of further improving the coal rate.