田庄选煤厂分选产品燃烧过程中汞的释放规律

EMISSION BEHAVIOR OF MERCURY FOR DIFFERENT PRODUCTIONS OF TIANZHUANG COAL PREPARATION PLANT DURING COMBUSTION

通常煤中含有0．1×10^-6～0．15×10^-6的汞，在燃烧和气化过程中被排放到空气中．由于其高挥发性和毒性，特别是会对神经系统造成影响，所以成为人们关注的一种重要的重金属元素．对河南省田庄选煤厂的一种T煤进行了分选，根据分选产品的TGA和DTG曲线分析了煤样的燃烧特性，通过对不同温度段元素汞和氧化态汞的采集和测定，研究了不同分选产品的汞释放行为．结果表明，末原煤、末中煤和末精煤具有相似的燃烧和汞释放行为．烟气中元素汞的含量大于氧化态汞的含量．通过物理分选，煤样中部分无机汞可以被富集到重产品中．

Mercury is contained in coal （about 0.1 × 10^-6-0.15× 10^-6） and it is emitted to the atmosphere in the process of combustion and gasification. Mercury （ Hg ） is a major concern among hazardous heavy metals because of its high volatility and high toxicity, especially due to its neurological health impacts. A bituminous coal was processed at the Tianzhuang Coal Preparation Plant in He＇nan Province. The objective of this study is to conduct detail studies that analyze the charateristic combustion of different products by TGA-DTG and the emission behavior of Hg by collecting and detecting the concentration of elementary mercury and the oxidized mercury at different range of temperature in smoke. The results indicateded that the fine raw coal, the fine middling coal and the fine cleaned coal have the similar rule of combustion and emission behavior of mercury. The content of elemental mercury is more than oxidized mercury in smoke. By physical separation method mercuric inorganic compound is enriched in middling coals.