COMBUSTION CHARACTERISTICS OF BLENDED COAL AND HYDROTHERMALLY TREATED MUNICIPAL SOLID WASTE

摘要

Experiments on co-combustion of municipal solid wastes (MSW) and coal were conducted in a bubbling fluidized bed (BFB). The MSW sample was pretreated through hydrothermal treatment (HT) for obtaining uniform characteristics. MSW blending ratios as 10, 20, 30 and 50 % were selected and tested at 700, 800, 900 ℃to verify to which extent coal can be substituted with the HT treated MSW in terms of emissions and unburnt carbon (UC) in fly ash (FA). The results are summarized as follows: The lowest CO and NO emissions were found at 20 % and 30 % MSW blending respectively. The SO_2 emissions decreased with the MSW addition. The HC1 emissions were below 5 ppm. Furthermore, the UC contents decreased at the mixing ratio below 30 % at low temperature. Positive synergistic relationships were identified and it is possible to accept 30 % MSW combustion in a coal-fired BFB reactor.