Experiments of the "semi-carbonization" pyrolysis were conducted for cellulose mixed with phosphoric acid in order to clarify the effect of acid additives on the transportation of semi-carbonized fuel. The acid additive promoted dehydration of cellulose, and induced the reduction in the weight yield of char under low temperature conditions. The analytical model to investigate the energy value of the semi-carbonized fuel was presented by taking account of the reduction in the fuel value due to the transportation. The addition of small amount of phosphoric acid to cellulose was effective for manufacturing the semi-carbonized fuel with the highest energy value at low pyrolysis temperature. The fuel energy value decrease with increasing the concentration of acid addition for a given transportation distance. It was found that the optimal concentration was 1 wt.% in the ranee of the present study.
