The Experimental Study On Environmental Trace Elements Migratory Nature In Combustion Process Of Huainan Coal

Certain trace elements especially heavy metal elements in the coal and the coal ash have the significant influence to the environment and humanity's health. The research on migration of the environmental trace elements in combustion process can provides the theory basis for reduction and control of the trace elements influence and has the important environmental significance.The distributed characteristic of the environmental trace elements in the coal and ash has been studied based on a series of tests analysis on the coal and its combustion product (coal ash) and utilization of mathematical statistic method. The majority of environmental trace elements belong to the normal level in the research area compare with North China and the nation, only V, Cu and Co have exceptionally high level. The distributed rule of the environmental trace element in the research area has been also studied.The migration of the environmental trace elements in the combustion process has been discussed by using test result contrast between coal and ashes that on different temperature computation and the analysis of the burning balance. In the overall look, the majority of elements have the partly emission on different combustion temperature, but the emission degree is high on high temperature than on low temperature. The elements behavior in the combustion may make division to three kinds: the first, Zn, Sb and Tl, the part enter the atmospheric environment by the volatility condition, the other remains in ash; the second, Cd, U, Co, Sn, Pb, Th, Cu and Ba, only have few part assumes the volatility condition to enter the atmosphere, the majority remains in ash; the three, Be, V, Cr, Ni, As, Se, Mo, all remain in ash basically.As to environmental effect, Pb, Cu, Co, Zn, Cd, U, Ba, Sn, Tl, Th and Sb have the dissipation in the combustion process, these elements is more serious than the others to the atmospheric pollution. Mo, Se, As, Ni, Cr, Be and V nearly nave the no dissipation.Each physical and chemistry parameter of trace environmental trace elements in the coal was unified in the paper. The migration behavior of elements was studied and the modes of the mobility and emission mechanism of trace elements in coal were discussed.