Ash formation in circulating fluidised bed combustion of coal and solid biomass
Formation mechanisms of the fly ash and bottom ash during circulating fluidised bed combustion of a bituminous coal and two solid biomass fuel were studied experimentally. The biomass fuels were forest residue and willow. The experiments ere carried out at full scale boilers. As a result, the main ash formation mechanisms are presented for coal and biomass combustion.
Ash formation was studied using the methods of traditional ash sampling and aerosol technology.By traditional ash sampling methods, samples of ash were collected from different ash streams of the boiler. The collection streams were the fuel feed, sorbent or bed material feed, boiler bottom ash, and the fly ash collected in the electrostatic precipitator. The methods of aerosol technology enabled sampling of the particle directly from the flue gas flows.
Fluidised beds have been used in the chemical industry. The first coal combustion applications, however, were not developed until many years later even though the fired patent on coal fired fluidised bed boiler was applied two decades earlier. The energy crisis increased the interest of using coal as an alternative to oil and fluidised bed combustion offered a way to burn coal in environmentally more friendly way than conventional pulverised coal combustion. Later, fluidised beds have also been successfully applied to combustion of alternative fuels such as biomass and materials.
The formation mechanisms of bottom and fly ash during circulating fluidised bed combustion of two biomass fuels and a bituminous coal were determined based on experimental results. The experiments were carried out in cull scale operating boilers. The results of this essay can be used to describe the ash behaviour in the fluidised bed boilers and therefore, to help solving ash related problems while developing more efficient processes, and boilers for new fuels.
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