How to improve coke strength

1. Increase the specific gravity of the coal pile fed into the furnace. 2. Increase the coking temperature and extend the furnace holding time. 3. Increase the heating speed. 4. Proper coking quenching.

It is most important to ensure the quality of the coal itself, as mentioned above. In coke oven management, fire drop control should be employed; measuring only the direct temperature has limitations when it comes to determining the maturity of the coke in a particular carbonization chamber. By knowing the timing for each carbonization chamber, adjustments can be made in a timely manner.

In my opinion, by adopting compacting coking and the dry quenching process, the M10 and M40 values of coke (wear resistance index, drum strength) can be significantly improved.

In addition to the methods mentioned above, spraying dilute solutions of boric acid or other substances that have a negative catalytic effect on the carbon dissolution reaction onto the coke can improve the post-reaction strength CSR of the coke

　a) Larger coke ovens, which increase the bulk density of the coal material within the ovens, thereby improving the strength of the coke； 　　b) Improve rapid moisture and ash testing devices for coal quality control ； 　　c) Use briquette coking to improve the wear resistance of coke ； 　　　　d) Use dry quenching of coke to reduce the factors that adversely affect coke quality resulting from wet quenching. 　　　　　　e) Ramming coking　　　　　　　 f) Addition of small amounts of additives during coking

1. The influence of coking speed on coke strength: For any coal blending ratio, there is a certain relationship between the strength of the coke and the coking speed; the longer the coking time, the greater the strength. (Under the same coal blending ratio, or when the coal blending ratio changes little.) ) 2. The influence of coal blending ratio on coke strength: Practice has shown that the higher the proportion of lean coal in the coal blending ratio, the greater the coke strength. 3. Effect of adding a binder on coke strength: Adding less than 3% asphalt can alter the strength of coke, as asphalt acts as a binder. Theoretical discussion on the main influencing factors: The adverse effects of low fineness and high moisture during the coking process. During the coking process of large-particle coal, the processes of pyrolysis, melting, and solidification to form semi-coke differ from the uniform processes that occur with coal of finer particle size. When the material has a fine texture (with particles smaller than 3 millimeters), when this homogeneous material is heated to its melting point, the contact surfaces between the larger coal particles and this homogeneous material also melt. However, due to the poor thermal conductivity of the gangue, the gangue on the surface of the larger coal particles melts and diffuses toward their core at a very slow rate. By the time the external homogeneous material has entered the stage of thermopolymerization and semi-coke formation, the core of the larger coal particles remains in a loose coal particle state. Coal has a high ash content and high shrinkage; during the shrinkage of semi-coke, an increase in cracks occurs, which reduces the strength of the coke. The inclusion of lean coal helps to mitigate this shrinkage process, as lean coal has a low volatile matter content. In the early stages of coking, the effect of moisture is crucial. Classical coking theories suggest that the heating rate should be high before 500 degrees, in order to quickly heat and melt the coal material; meanwhile, the airtight nature of the gelatinous substance is utilized to generate significant expansion pressure, which helps to soak up and bind the inert particles in the coal, thereby enhancing the strength and wear resistance of the coke. However, during the semi-coked shrinkage stage, the heating rate must be reduced to control the formation of numerous cracks during this shrinkage process. The specific methods to reduce moisture are: 1. Control the moisture content of the coal incoming ； 2. Strengthen coal yard management and increase the proportion of coal that reaches the ground ； 3. Testing coal drying using far-infrared radiation or waste gas heating

Improve coal quality, as well as moisture and ash content!

1. Coal blending ratio 2. Quality of coal 3. Duration of furnace idling 4. Reduction in water spraying amount for wet coke