Possibilities of burning high ash brow coals with additions of biomass

摘要

Combustion of solid fuels is controlled by valid legislation that determines emission limits for combustion in facilities of different outputs. Lignite coal from the North Bohemian Lignite Field is characteristic for its high content of sulphur (up to 3,5 percent Std). During combustion of that coal, high emission concentrations are formed and that coal becomes unsaleable. With regard to the long-term surface mining, there are land-reclaimed mined out areas available, which can be used for growing energy biomass. Grown biomass can be used for the production of a new product which contains, in contrast to hard saleable lignite coal with a high content of sulphur, a biomass compound which, during combustion, decreases the value of emission concentrations and along with an additive agent, which is another compound of the lignite coal pellets, ensures a decrease in emissions to a value which is determined for solid fuel combustion. For the needs of burning tests, several samples of lignite coal pellets were prepared, which were burnt in a boiler designed for lignite coal combustion and the emission values were compared to the emission values which are reached during pure lignite coal combustion.