SNG-electricity cogeneration through MSW gasification integrated with a dual chemical looping process

Abstract

This paper assesses, from a technical perspective, the conversion of municipal solid waste (MSW) to SNG and electricity through gasification simultaneously with a dual chemical looping process, namely chemical looping air separation and calcium looping CO2 absorption. This novel technology includes five main parts: chemical looping air separation (CLAS), MSW gasification, water-gas shift process with calcium looping for enhancement of CO2 absorption (WGS-CaL), heat recovery steam generator (HRSG) and power island. The performance of CLAS, which presents an advantage over the other mature technologies in capital cost, is examined. WGS-CaL is an efficient method for SNG production and CO2 capturing. The three major factors, Mn/M to MSW (Mn/M), steam to MSW (S/M) and the ratio of syngas introduced to WGS were analyzed. Meanwhile, the exergy destruction analysis of whole process has also been calculated.