Abstract
To achieve the clean and efficient utilization of low-rank coal, the combustion and pollutant emission characteristics of chars from low-temperature and fast pyrolysis in a horizontal tube furnace were investigated in a TG-MS analyzer. According to the results, the combustion characteristic of chars was poorer than its parent coals. The temperature range of gaseous product release had a good agreement with that of TGA weight loss. Gaseous products of samples with high content of volatile were released earlier. The NO and NO<sub>2</sub> emissions of chars were lower than their parent coals. Coals of high rank (anthracite and sub-bituminous) released more NO and NO<sub>2</sub> than low rank coals of lignite, so were chars from coals of different ranks. SO<sub>2</sub> emissions of char samples were lower than parent coals and did not show obvious relationship with coal ranks.
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