Co-pyrolysis of coal and seaweed can not only effectively decrease the carbon footprint but also improve the quality and output of coal pyrolysis products,however,the influence of seaweed on thermal releasing behaviors of mercury during co-pyrolysis process are still un-clear.In this work,the chlorella and Guizhou bituminous coal were mixed and used to reveal the mercury release behavior during co-pyrolysis by the temperature programmed pyrolysis experiments,thermogravimetric and differential thermogravimetric analysis(TG-DTG)and thermogravimetry-mass spectrometry(TTG-MS)methods,offering a sufficient explanation on the control technology of mercury pollutants in co-pyrolysis.The results exhibited that a large amount of reducing gases such as CO,H2 and H2O were generated in chlorella at the temperature range of 100-500℃,which was favorable for the transformation from oxidized mercury to elemental mercury,thus remarkably increased the release of elemental mercury in the raw coal sample.The mixed chlorella also significantly lowered the decomposition temperature range(from 400-600 to 300-400℃)of pyrite-bound mercury and decreased the decomposition temperatures of the pyrite-bound mercury species.Additionally,in the co-pyrolysis about 91.82％of mercury was released into the gas phase below 400℃and was 13.77％higher than that of in individual pyrolysis of coal.

Huawei Zhang;Yifan Zhou;Ting Liu;Xiaopeng Tian;Yuhan Zhang;Juan Wang;Mingzhu Zhang;Thipphasone Phoutthavong;Peng Liang

School of Environmental and Municipal Engineering,Qingdao University of Technology,Qingdao 266033,China;College of Chemical and Biological Engineering,Shandong University of Science and Technology,Qingdao 266590,China;Shanxi Institute of Industrial Standardization,Taiyuan 030032,China

环境科学学报（英文版）

[1]Huawei Zhang;Yifan Zhou;Ting Liu;Xiaopeng Tian;Yuhan Zhang;Juan Wang;Mingzhu Zhang;Thipphasone Phoutthavong;Peng Liang-.Mercury release behaviors of Guizhou bituminous coal during co-pyrolysis:Influence of chlorella)[J].环境科学学报（英文版）,2022(09):23-32

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