Effects of coking coal properties on coke pore structure: Prediction models

¹ School of Chemical Engineering, North China University of Science and Technology, Tangshan, Hebei Province 063009, P.R. China
² Hebei Province Coal Chemical-Engineering Technology Research Center, Xingtai, Hebei Province 054001, P.R. China
³ Key Laboratory of Chemical Metallurgy Engineering, University of Science and Technology Liaoning, Anshan, Liaoning Province 114051, P.R. China
e-mail: wangqi8822@sina.com

Received: 13 December 2015
Accepted: 10 March 2016

Abstract

The porosity, pore size, and specific surface area of coke significantly affects its strength and thermal properties. To investigate the factors affecting the pore structure during the carbonization of coking coal, experimental studies were performed using 18 types of single and mixed coals. Based on the experimental results of the structure and properties of coke pores, regression equations were developed to predict the structural parameters. The structural parameters include porosity, average pore size, volume ratio of pores with diameters >150 ¯m, volume ratio of pores with diameters <30 ¯m, and specific surface area. The regression equations indicate that the maximum volatile release rate, Gieseler fluidity, and vitrinite maximum reflectance are the main factors affecting the formation of micron-size pores. The surface area of coke dominated by nanoscale micropores was significantly affected by volatiles released during 800−950 °C.