Thermodynamic simulation of Na speciation distribution of Xinjiang coal during the gasification process
In order to study the speciation distribution of Na element in Xinjiang coal during the gasification process,based on the principle of thermodynamic equilibrium,Factsage software was used to carry out the chemical thermodynamic simulation analysis of the gasification process of Baishihu coal and Jiangna coal.The results showed,(1)Under gasification conditions,when the temperature was 800℃to 1 400℃,the main gaseous products of Jiangna coal and Baishihu coal were NaCl(g),and a small amount of Na(g)and NaOH(g)were produced.With the increase of temperature,the content of Na(g)and NaOH(g)precipitated from the two coals gradually increased,and the content of NaCl(g)reached the peak at 1 150℃,and then its precipitation gradually stabilized or decreased.(2)During the gasification process of Jiangna coal and Baishihu coal,a large amount of Na2CaAl4O8(g)and a small amount of Na4Al4O8(g)were generated at 800℃-1 050℃.When the gasification temperature was higher than 1 100℃,both Na2CaAl4O8 and Na4Al4O8 were decomposed and disappeared.(3)In the gasification process of Jiangna coal and Baishihu coal,liquid slag was generated starting from 1 000℃.The Na compounds in liquid slag were mainly Na2O,NaAlO2,Na2S,NaAlS2,NaFeO2 and NaFeS2.These minerals were prone to eutectic reaction and generate eutectic with low melting point,which would reduce the ash melting temperature of Jiangna coal and Baishihu coal,increase the viscosity of ash,and lead to slagging and other problems.
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