Citation: DONG Yong, YU Min, WANG Peng, ZHANG Meng-ze, SUI Hui, CUI Lin, ZHANG Li-qiang, XU Xi-ren, MA Chun-yuan. Experimental study on mercury release behavior during coal pyrolysis with calcium chloride addition[J]. Journal of Fuel Chemistry and Technology, ;2014, 42(1): 31-36. shu

Experimental study on mercury release behavior during coal pyrolysis with calcium chloride addition

1.
National Engineering Laboratory for Coal-fired Pollutants Emission Reduction, Shandong University, Jinan 250061, China

Corresponding author: DONG Yong,
Received Date: 2 April 2013
Available Online: 26 July 2013
Fund Project: 国家自然科学基金(51176103)。 (51176103)

Mercury release and speciation behavior during coal pyrolysis with the addition of calcium chloride in different chlorine contents of 0.1%,0.3% and 0.5% in mass was studied in a temperature-programmed tube furnace. The concentration of gaseous mercury was monitored online with an online mercury analyzer. The results show that the temperature is a key factor for the mercury releasing during coal pyrolysis. With the rising of calcium chloride addition in coal, the percentage of Hg²⁺ increases, while the temperature of maximum mercury releasing and the release of total mercury decrease. The percentage of Hg²⁺ also increases to some degrees with the increase of O₂ percentage raised. Higher heating rate can promote the mercury release in coal and enhance the proportion of Hg²⁺ in flue gas. The study indicates that the calcium chloride addition into the low-chlorine coal can enhance the oxidation of Hg⁰.
- mercury,
- coal,
- calcium chloride,
- pyrolysis
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