Feasibility analysis about sludge co-combustion with coal based on fuel characteristic experiments and thermodynamic calculation

摘要

This work studied co-combustion of dyeing sludge and bituminous coal via thermo-gravimetric combustion experiment, ash fusion point experiment and boiler thermodynamic calculation. Experiment found that the ignition temperature of dyeing sludge was so low as about 272 °°C, declaring that certain amount of dry sludge added into bituminous coal would help to improve the ignition characteristics. When ratio of the sludge reached 10%, the softening temperature of the ash declined to 1158 °°C, approaching the boundary temperature of fusible ash. According to boiler thermodynamic calculation, within blending ratio of 10%, little influence came about on furnace combustion and heat transfer of the heating surfaces followed. Therefore, the largest blending ratio of sludge could be determined as 10% for economy and secure accounts.