Preparation method of glycerol-impregnated modified hybrid coal

摘要

The present invention impregnates the low-grade coal with a mixed solution of glycerol and sulfuric acid generated as a by-product in the biodiesel process to prevent the glycerol impregnated in the coal from volatilizing even when the coal is torrefied at a temperature higher than the volatilization temperature of glycerol. It relates to a method for producing a modified hybrid coal impregnated with glycerol capable of producing an improved hybrid coal. The present invention, preparing the coal (S10) and; Mixing the glycerol and sulfuric acid solution (S20) and; Impregnating the coal in the glycerol sulfuric acid mixture (S30) and; drying the coal impregnated with the glycerol-sulfuric acid mixture (S40); and torrefied the dried coal under nitrogen condition (S50).