TG-MS study on coal/char combustion by equivalent characteristic spectrum analysis

Abstract

Combustion of Shenmu coal and Shenmu char was comprehensively studied with online thermogravimetry–mass spectrum (TG-MS) system by equivalent characteristic spectrum analysis (ECSA). This method makes continuous and online measurement of coal/char combustion, a continuous and rapid thermal process, possible and quantified. The evolved gases were quantified by ECSA, and the mass flow rate of evolved gas agreed well with the mass loss data of DTG for both Shenmu coal and Shenmu char. NH3 and HCN are detected out as the major precursors of NOx while the volumetric of HCN is larger than that of NH3 for both Shenmu coal and Shenmu char. NO and NO2 emissions are lower for Shenmu char than those of Shenmu coal. H2S and COS are detected out as the major precursors of SO2 in combustion of Shenmu coal. COS and SO2 are not detected out during combustion of Shenmu char.