Ash and slag properties for co-gasification of sewage sludge and coal: An experimentally validated modeling approach

摘要

Regulatory changes in the EU and Germany, and environmental aspects direct the attention of the agricultural and energy sector towards sewage sludge as a new resource. The present study evaluates the co-gasification of sewage sludge with brown coal in a slagging gasifier. Currently, a lack of experimental data on phosphorous containing ashes and slags under reducing atmospheres limits our understanding of gasification of this fuel. To address this gap, in this study the ash and slag properties of one brown coal and its mixtures with sewage sludge were experimentally investigated under a reducing atmosphere and predicted with FactSage". An ASPENplur' simulation of the co-gasification is conducted to evaluate the impact of the changing feedstock characteristics on major process parameters when different mixtures of sewage sludge and brown coal are fed into a Siemens gasifier.