AbstractThe aim of the present study is to develop the biomass furnace combustor which can effectively use the compost as a fuel. Here, the compost which is made from pig's waste and has the calorific value of 2000kcal/kg, is employed here. Emphasis is placed on the optimum conditions of fuel and air flow rates, moisture content of the compost and the corresponding combustion gas components and combustion gas temperature in the combustor. It is found from the study that (i) the self-combustion takes place less than 40% of the compost's moisture content, (ii) the effective combustion is induced using the fine particles of compost, i.e., the pulverized compost, and (iii) the steady-state combustion is maintained by the relationship of air and compost rate.