Production of hydrogen-rich syngas from novel processes for gasification of petroleum cokes and coals

Abstract

This paper investigates the effects of various gasification parameters on the composition of the syngas produced from the co-gasification of petcoke and coal for improved applications. Two types of coal and one type of petcoke are considered to form four different mixtures for study in order to analyze the system operating conditions and assess the system performance. The gasifier is modeled and simulated in Aspen Plus based on Gibbs free energy minimization approach of an entrained flow gasifier with oxygen being the gasification oxidant generated by a cryogenic air separation unit. The energy efficiency assessment of the four feed mixture shows that the maximum energy efficiency of the gasification is improved for higher grade coals when co-gasifying them with petcoke in contrast to the lower grade coal. The four mixtures require higher steam and lower oxygen to achieve the maximum energy efficiency compared to the gasification of coal only, which appears to be true for mixtures of both considered coal types.