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Coal particle ash content has important influence on the bottom ash formation behavior in fluidized bed combustion. Therefore, experiments were conducted on a benchscale fluidized bed combustor to study their relationship. Yima bituminous coal was chosen as the experimental sample. Results show that the influence of coal particle size distribution upon the bottom slag size distribution is gradually...
Pelletizing and combustion behaviors of wood waste with and without additive addition were investigated in this study. It was found that the wood waste pellets have a high potential for slag formation during combustion and can cause operational problems. With additives addition, no significant changes were observed regarding mechanical properties of the wood waste pellets. Sewage sludge addition was...
Co-firing biomass with coal is one of the most important measures for environmental protection and energy sources sustainable development. In this study, some low-temperature pyrolyzed experiments on three common biomass of China (e.g., sawdust, rice hull, and peanut shell) are carried out firstly under different temperature and different time. Then, the combustion, slagging, fouling and abrasiveness...
An exploratory survey of the mercury content of some common California biomass feedstocks shows that the concentrations are well below EPA toxicity levels with representative feedstock concentrations of 20 ppb for rice straw, 28 ppb for wheat straw, and 32 ppb for whole-tree wood chips. The temporal variability for rice straw (17–20 ppb) is near the analytical uncertainty (∼2 ppb). Saline-irrigated...
For that current power plants mainly use low-quality coal as fuel, Lengshui river coal ash as base-ash, separately make up ash-sample with CaO content of 10%, 20%, 30% or 40%, then measure the DT, ST, HT and FT of ash-sample by placing them at SDAF2000b ash melting point tester; spread ash upon SiC and aluminum refractory, calcined for 20 hrs with muffle furnace at 1250??C, make cool observation and...
Contraposing the indeterminable problems such as fuzziness and diversification which influenced the slagging of coal ash, grey cluster decision was applied in evaluating the slagging properties of the power generation coal in the paper, combined with the fuzzy TOPSIS method. In the paper, the four indexes of T2, SiO2/Al2O3, B/A, G(the rate of Si) of 13 kinds of power generation coal were evaluated,...
Experimental melting of biomass ash blends demonstrates that the addition of rice straw to a dominantly wood-based fuel causes a marked freezing point depression in the liquidus temperature of the inorganic slag from well above 2000 °C to a minimum of about 1260 °C. The minimum temperature is achieved for ash blends with about 30% rice straw ash. The melting interval (liquidus to solidus) for the...
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