TG-MS Study on Coal/Char Combustion by Equivalent Characteristic Spectrum Analysis
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 combust
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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.
Keywords
ECSA
1
Combustion
TG-MS
Introduction
Coal combustion refers to the severe chemical reaction between combustible organic matter in coal and the oxygen at a certain temperature, gives off heat and light, and generates flue gas and ash in a very short time. To figure out this complicated thermal process, researchers have done a lot of work with application of thermal analysis instruments or techniques such as thermogravimetric analyzer (TGA), gas chromatography/mass spectrum (GC/MS) or GC, MS, and Fourier transformed infrared spectroscopy (FTIR). Moreover, coupled systems, such as TG-GC, TG-FTIR, and TG-MS, have been widely used to study the variations of solid and the Z. Gong H. Xia Z. Liu (&) Q. Lu Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China e-mail: [email protected] Z. Gong University of Chinese Academy of Sciences, Beijing 100190, China
gas phases in combustion simultaneously. TGA can provide the thermogravimetric (TG) and differential thermogravimetric (DTG) results for coal combustion, but it cannot analyze the evolved gases. GC/MS or GC, MS, and FTIR can all be applied for the analysis of the evolved gases in combustion. Compared with MS, GC/MS or GC is non-continuous in time, while in FTIR, the characteristic spectrums of main pollutant gases are strong overlapped, which are not suitable for precisely analysis, especially for a continuous and rapid thermal process such as coal combustion. Taking into account the continuity in time as well as the potential for accurate qualified or quantified analysis, TG-MS analysis is perhaps the mostly used in these techniques [1], especially in coal/char combustion. Arenillas et al. [2] used a TG-MS system to study the behavior of char combustion, and they indicated that the heating rate and parent coal rank had a significant influence on the char texture and NO reduction on the char surface. Moreover, he investigated coal pyrolysis using model compounds and a synthetic coal by TG/MS/FTIR [3] and proved that synthetic coal can be very useful for the study of the reaction
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