Heat and mass transfer analysis of coal coking process in the coking chamber

To study the coking heat mass transfer process and reveal the law of industrial-scale coal pyrolysis, the heat transfer characteristics of coal material in the coking process are analyzed based on coke oven temperature measurement experiments. A mathematical model of the coking process in the coking chamber was constructed based on the distributed activation energy model. The heat transfer process of the coal feed, generation of coke oven gas, and dynamic precipitation characteristics of each component during the coking cycle were further studied. The results show that tar and water are the earliest released and fastest precipitated pyrolysis products, respectively, which are completely precipitated at 800 K. The contents of the components of the inward and outward gases are obviously different, with CH4 and H2 accounting for 73.79% of the outward gas, while H2O and tar account for 77.80% of the inward gas. When the coal reaches 1200 K, all pyrolysis products except H2 are precipitated completely. The model can effectively predict the changes of raw coke oven gas composition during the coking process at different locations in the coking chamber.