A pilot-scale fireside deposit study of co-firing Cynara with two coals in a fluidised bed

摘要: Abstract Costs of biofuel production from energy crops can be reduced by applying the crop residues in heat and power production. Perennial herbaceous like Cynara cardunculus L. are challenging fuels because they tend to have high ash chlorine contents. Coals, however, often rich aluminium silicates sulphur, co-firing these biofuels with coal could expected reduce operational problems. In addition, CO2 emissions lower than during firing alone. Blends two coals, South African bituminous Spanish sub-bituminous coal, were combusted a 20 kW bubbling bed pilot reactor ascertain ability coals problems alkali capture. The fuel sample contained almost 2 wt% chlorine. was kaolinite capable capturing alkalies chlorides produce silicate HCl. sulphur (mostly present as FeS2), produced concentrations SO2 that partially oxidised SO3. SO3 capture sulphation. Up 30% Cynara, on basis, co-fired without problems, whereas same percentage led strong Cl deposition. Co-firing both resulted HCl (up 1500 mg/Nm3 6% O2). very about 16,000 mg/N m3 Thus, plant such blends must equipped flue gas cleaning equipment for effective channel after superheaters, or else quality markedly improved changing harvesting technology fertilisers, which major sources content fuel.