Interactions Between Vitrinite And Inert Component During Coking Process

Vitrinite is a main active component of coal,and its activity and content directly affect the extent of interaction between active and inert components during pyrolysis and coking process,which also influence the quality of coke.The accurate evaluation of the activity of vitrinite in coking coals is an important basis for predicting the quality of coke.In this paper,the extent of the interaction between active and inert components at different proportions is studied from the thermal properties of coke.Five coking coals with different ranks are studied,including Fushun gas coal,Tangshan 1/3 coking coal,Monggu fat coal,Lakewo coking coal,and Zhaiyadi coking coal.The vitrinite of coal samples is enriched using the centrifugal separation by zinc chloride density solution as active component.Then,added into them with different proportions of standard anthracite as inert component to make coke.The coke gasification reaction is studied and the average weight loss rate is extracted as an index to study the extent of the interaction between active and inert components.The research results show that,with the increasement of inert components,the average weight loss rate of all five cokes decrease first and then increases,however the parabolic opening amplitude(focal length p)is different,strong coking fat coal with a large opening,weak coking gas coal with a small opening.Further analysis can find that the value of p also shows a opening down parabolic curve(661.1)125.1(655.22maxRp+--=)with increasing of coal rank(maxR).Therefore the value of p could be used as a new index to evaluate the activity quality of vitrinite.The XRD and SEM images are analysised and show that the changes of microcrystalline structure parameters and the morphology of coke with inert components are also consistent with the average weight loss rate.In addition,the difference of the caking characteristics of vitrinites different ranks is clarified by micro perspective.The results provide an experimental and theoretical basis for evaluating coking coal,making rational use of coal resources and increasing the level of automated coal blending.