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 (432Kb)
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2,172,000 Yen
Bio-briquette is a sort of composite fuel consisting of 70 to 85 percent of coal and 15 to 30 percent of biomass by weight, produced by high pressure briquetting method with compression only in the roll press technique without any binder. The biomasses works as a binder in the bio-briquette and various woody wastes and agriculture wastes such as rice straw, rice bran, sorghum stalk and wheat straw are used. As compared with raw coal, it is expected little emissions of air pollutants from combustion of bio-briquette containing slaked lime as sulfur fixation agent and little residual matters after burning, and higher sulfur-fixation efficiency. Total yearly output of woody wastes and agriculture wastes in Chongqing amounted to ca. 18.0 million tons based on investigating data. So, it is expected enough biomass materials to produce bio-briquette in Chongqing. The water soluble chemical components of various biomass produced in one of the districts and residual matter after its combustion were measured. Most of the sulfurs in biomass were inorganic salts. The experimental results indicated that there were little emissions of air pollutants from biomass combustion and emission amounts were in the range of 0〜43, 16〜912 and 114-789mg for HF, HCl, and SO2 per 1kg of biomass, respectively. The least emission was obtained for woody dust combustion. Therefore, woody dust was considered as the best suitable biomass to produce bio-briquette. The sulfur-fixation and ash-abatement efficiency of bio-briquette produced from raw coal and woody dust amounted to 82% and 25%, respectively.
Biomass, Bio-briquette, Combustion experiment, Sulfur-fixation, Acid rain