Gasification characteristics of three herb residues

By adapting gasification method, this paper conducts a gasification test on three kinds of herb residues, including Qiju Dihuang Wan, Liuwei Dihuang Wan, Xiangsha Yangwei Wan, of which the water contents were about 25 percent. Compared with corn stalk, the results showed that when the excess air coefficient was 1.1, all of the above three kinds of herb residues showed good gasification characters, with the calorific values above 5300 kJ/m3. The calorific value of Xiangsha Yangwei Wan residue was 5 460 kJ/m3. Compared with corn stalk, herb residues produced more tar during the gasification process. When the excess air coefficient was 1.1, the tar content of the three herb residues was about 1 000 mg/m3 and it kept decreasing with the increase of excess air coefficient. This experiment proves that these three kinds of herb residues have good gasification characters, providing a new method to the resource recovery of herb residues.