The Effect Of Devolatilization Behavior Of Coking Coal Volatile Matter On The Pore Structure Of Coke

The pore structure of coke has a very important influence on the mechanical strength(M40, M10) and thermal performance(CRI, CSR), and the stability of blast furnace smelting is affected. Thus, this study carried out research on the formation law of coke pore in coking process, to provide the oretical guidance for coke production.Some representative coking coals with different coal ranks are selected, including gas coal, fat coal and coking coal. Blending was carried out with the ratio of 1:1, among the coals with different degrees of metamorphism. At 500?, 600?, 800? and 950?crucible coke were made with single coal and blended coal. For the pore stucture parameters of coke, the porosity, average pore size and pore size distribution were measured by image analysis, and the specific surface area was measured by nitrogen adsorption method. The pore stucture of coke under the different final temperature were compared. Experimental results show that, the coke which was made at 500?, 600?has the most developed pore stucture, indicating that 500~600? is the key stage for the development of coke pore structure. At 950?, the coke which was made with fat coal has more developed pore strcuture than the coke which was made with gas coal, fat coal.The pore structure parameters of coke have a additivity, this coke were made with single and blending coal.The caking property and volatile release characteristics of testing coal sample were tested. Test parameters include maximum weight loss rate(DTGmax), Gieseler fluidity(Lg MF) and volatile matter yield in different temperature section(0~300?, 300~600?,600~800?, 800~950?). Multiple linear regression was performed among the above parameters and mathematical model was established by SPSS analysis software, to analyze the factors affecting the formation of coke pore. The model analysis shows that DTGmax(X1) and Lg MF(X2) are the most important factors for the pore structure. And the average maximum reflectance of vitrinite Rmax and the percentage of volatile matter in 800~950? have a certain influence. The prediction model of coke pore structure has intuitive results and high accuracy. It has a great guiding significance for coke production.