Fluidized bed combustion technology of oily sludge.

概要

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To develop a new process for heat recovery from oily sludge without any environmental pollution, the combustion experiments of low grade oily sludge having a 3, 500kcal/kg of calorific value were performed using a fluidized bed combustor with a 0.3m square area and a 3.25m height. The combustor was equipped with an air distributor of the pipe-slit type for the continuous discharge of combustion residues such as iron rust and pebbles from the bottom. The use of the above-mentioned air distributor and the continuous feeding of fluidizing particles enabled a continuous and stable operation without the piling of the combustion resides in the bed. Then, the sludge could be completely burned at a bed temperature of above 750°C and a residual oxygen concentration of over 5%. The simultaneous removal tests sulfur-dioxide (SO2) and hydrogen chloride (HCl) were also carried out by means of limestone and/or coral reef rock feeding in the bed. The HCl removal efficiency increased apparently with the value of a Ca/ (S+Cl2) mole ratio, whereas SO2 removal efficiency was slightly affected by a mole ratio that ranged from 2 to 6. The removal efficiencies of SO 2 and HCl were 85% and 55%, respec-tively, at a mole ratio of 3 for coral reef rock.
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