Abstract
A wood pellet combustion carries out with high efficiency and comfort in modern pellet boilers. These facts help to increase the amount of installed pellet boilers in households. The combustion process quality depends besides the combustion conditions also on the fuel quality. The wood pellets, which don`t contain the bark and branches represent the highest quality. Because of growing pellet demand, an herbal biomass (phytomass), which is usually an agricultural by-product becomes economically attractive for pellet production. Although the phytomass has the net calorific value relatively slightly lower than the wood biomass, it is often significantly worse in view of the combustion process and an emission production. The combustion of phytomass pellets causes various difficulties in small heat sources, mainly due to a sintering of fuel residues. We want to avoid the ash sintering by a lowering of temperature in the combustion chamber below the ash sintering temperature of phytomass via the modification of a burner design. For research of the phytomass combustion process in the small boilers is constructed the experimental combustion device. There will investigate the impact of cooling intensity of the combustion chamber on the combustion process and emissions. Arising specific requirements from the measurement will be the basis for the design of the pellet burner and for the setting of operating parameters to the trouble-free phytomass combustion was guaranteed.
Highlights
Every sort of biomass have their specific energetic properties, which vary between each other considerably
Phytomass combustion in small-scale pellet boiler causes a lot of troubles
After exceeding the ash deformation temperature the ash transforms into the slag, the sinter and other agglomerates
Summary
Every sort of biomass have their specific energetic properties, which vary between each other considerably. Phytomass pellets can’t be generally consider like the fuel with exact defined and homogenous properties, because a chemic composition is very different. A chemic composition depends on sort of biomass and way of growing mainly. Phytomass combustion in small-scale pellet boiler causes a lot of troubles. The biggest weaknesses are slagging, sintering and melting ash at significantly lower temperature than wood pellets [4, 5]. After exceeding the ash deformation temperature the ash transforms into the slag, the sinter and other agglomerates. The cumulated ash and agglomerates, which are created in the furnace, restrict the fuel combustion process. It means that combustion is disturbed even it can be stopped. We can’t ignore much higher emissions from phytomass
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