LAUSR

A typical Chinese lignite (HLH) was used for determining the correlation among upgrading temperature, moisture re-adsorption behaviors, and nitrogen evolution characteristics during the combustion process. The upgraded samples were obtained from four drying temperatures: 393, 423, 453, and 483 K in the ComDry (counter flow multi baffle dryer) system. By means of the utilization of the N2 adsorption method and scanning electron microscope, the effects of drying temperature on the surface morphology and pore structural characteristics of lignite particles were determined. With the increase of drying temperature (Td), big pores collapsed into small ones leading to the enhancement of porosity, pore volume, and specific surface area, as well as the reduction of the average pore diameter. The distribution of oxygen-containing functional groups (C(O)) on the surface of the samples dried at different temperatures was identified by Fourier transform infrared spectroscopy. More carboxyl and hydroxyl converted into ...