Abstract
Based on the temperature and O2 concentration in the cement precalciner, co-combustion of anthracite and Refuse Derived Fuel (RDF) were investigated using a thermogravimetric analyzer (TGA) and a double furnaces reactor. Both the TGA and double furnaces reactor results indicated that the co-combustion characteristics were the linear additive effect in the devolatilization stage, while it was the synergistic effect in the char combustion stage. During co-combustion, at 900 °C, NOx released rapidly during the devolatilization stage, but in the char combustion stage the NOx formation were inhibited; at 800 °C, a large amount of CO formed, which could reduce the NOx. In general, at 900 °C and 800 °C, the application of co-combustion could lower the NOx emission yield and lower the NOx conversion. By combining the combustion characteristics with the XRD results, it was indicated that during co-combustion, at 800 °C, the SO2 formation reaction was inhibited, and the SO2 yield and conversion were quite low.
Highlights
The coal consumption of the precalciner accounts for about 60% of the new dry process cement industry
The volatiles combustion of Refuse Derived Fuel (RDF) and the moisture evaporation of anthracite were independent in the initial stage of co-combustion; this constitutes the linear additive effect of the separate combustion of RDF and anthracite
At 318–543 ◦ C, the weight loss rate of the actual co-combustion was quicker than the predicted values, which showed that the combustion of RDF could enhance the anthracite combustion
Summary
The coal consumption of the precalciner accounts for about 60% of the new dry process cement industry. To date, some scholars have studied the co-combustion characteristics of RDF and coal; few of them chose the anthracite as the research object. Their experimental conditions were quite different from the actual cement plant. In this study, one RDF and one kind of anthracite taken from a cement plant were selected as the research object In this approach, the thermal characteristics and combustion patterns of RDF, anthracite, and their blends were intended to be evaluated by proximate and ultimate analysis, TGA, XRD, and a double furnaces reactor. The results will provide a theoretical reference to the proper disposal of RDF, the combustion of anthracite in the precalciner, and the effective reduction of the emission of NOx and SO2
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