This work aims at demonstrating the feasibility of replacing Indonesian coal (INC) with hydrothermally treated municipal solid\r\nwaste (MSWH) in cocombustion with high ash Indian coal (IC). The combustion efficiencies and emissions (CO, NO) of MSWH,\r\nINC and their blends with IC for a series of tests performed under a range of temperatures and air conditions were tested in a droptube\r\nreactor (DTR). The results showed the following. The combustion efficiency of IC was increased by blending both MSWH\r\nand INC and CO emission was reduced with increasing temperature. For NO emission, the blending of MSWH led to the increase\r\nof NO concentration whereas the effects of INC depended on the temperature. The combustion behaviors of IC-MSWH blend\r\nwere comparable to those of the IC-INC blend indicating it is possible for MSWH to become a good substitute for INC supporting\r\nIC combustion. Moreover, the CO emission fell while the NO emission rose with increasing excess air for IC-MSWH blend at\r\n900?C and the highest combustion efficiency was obtained at the excess air of 1.9. The existence of moisture in the cocombustion\r\nsystem of IC-MSWH blend could slightly improve the combustion efficiency, reduce CO, and increase NO.
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