What types of coal are mainly used in ramming coking, and what type of coal is used for top charging?

Ramming coking is a new coking process that has been developed in recent years; it allows for an increased proportion of bituminous coal or weakly caking coal, with the proportion of bituminous coal able to reach over 65%. After blending, the dry ash-free volatile matter content ranges from 29% to 34%, while the moisture content is between 9% and 11%. The strength of the coke produced is good. Top-loading coking: It is a process in which coal of different types – gas coal, fat coal, coking coal, and lean coal – is mixed in certain proportions and then fed into the coke oven from its top under natural conditions to carry out coking. The typical composition is 25% bituminous coal, 15% fatty coal, 10% lean coal, and 50% primary coking coal and 1/3 coking coal; after mixing, the volatile matter content of the combustible base is around 25%

I have a friend who has experienced the transition from top-loading to ramming. Previously, they used rich coal and coking coal for top-loading, but after switching to ramming, they started using gas coal and lean coal. That’s why I thought of this topic for everyone to discuss.

We use 1/3 coking coal, low-quality coking coal, and lean coal

Our plant’s top-loading furnaces currently use a combination of coking coal and lean coal for coke production, with lean coal accounting for about 10–15% of the mixture. In the past, a combination of coking coal, rich coal, and lean coal was used. Generally, top-loading furnaces require a mixture of four types of coal: gas coal, rich coal, coking coal, and lean coal. The choice of coal mixture is determined primarily based on ensuring the quality of the coal mixture, as well as considering the local availability of coal and transportation costs. It is important to maintain the cohesion and caking properties of the coal mixture, with an ash content of less than 10% and a volatile matter content of 25–30%. I have no experience with the ramming process. According to available information, increasing the proportion of gas coal or low-cohesion coal can help, but I’m not sure about the details, so I won’t go into that. If the owner’s modification is successful, could they share it? Looking forward to it………………