Gas formation characteristics and inter-action during pulverized coal combustion in a precalciner environment
![10 Gas concentration distribution contours [%] and temperature contour (K) for bituminous coal combustion at Y = 0 m at 1173 K(a) CO(b) CO2(c) NOx(d) Temperature](/uploads/images/2018/w289_h200_x144_y322_Process_Xiaolin_Gas_formation_figure10a-19d2e7d912c71868.jpeg)
Pulverized coal combustion was investigated for bituminous coal and anthracite at different temperatures (973K and 1173K) in a horizontal fixed-bed reactor test system using computational fluid dynamics (CFD) software. The high temperature sufficed to promote NOx formation. For coals of identical mass, much more NOx formed during anthracite combustion than was the case for bituminous coal, but the maximum NOx concentration for bituminous-coal combustion was higher. Two experimental results are mutually complementary, providing important theoretical guidance for exploring the gaseous products of pulverized-coal combustion. Choosing anthracite as fuel and locating the coal inlets in the low-temperature zone could reduce the level of NOx emissions in the cement industry.
1 Introduction
China’s total energy consumption in 2014 was equal to 4.26 billion t of standard coal. Coal consumption accounts for more than 66 % of the total energy consumption in China, which shows that, in the process of industrialization in China, coal enjoys an unshakable status.
Coal accounts for 70 % of total energy consumption in cement production processes [1-3]. The type of precalciner used in the cement industry is a large-scale, complex chemical engineering reactor. As a high-temperature gas-solid reactor, the functions of the precalciner are gas-solid dispersion, pulverized coal...
