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THERMAL CONDITIONS REQUIRED FOR POULTRY MANURE COMBUSTION IN FURNACE BOILERS
Abstract
The topic addressed in this paper is related to two waste management (poultry manure) objectives: reducing environmental impact through combustion, and energy generation. Poultry industry waste is produced in large amounts and cannot be always used as a fertilizer. Its storage needs large sites, but if they are improperly designed could affect the phreatic groundwater. The paper is organized as it follows. The first part presents the energy characteristics the waste samples analyzed (they come from a poultry farm, which beds the floor with cereal straw or sawdust; relatively to the waste mass, the bedding represents about 5% to 15%). The samples are taken from an intermediate warehouse located between the production halls and the central warehouse of a large capacity poultry farm. Regarding the location, the poultry farm is placed in the center of the historical region of Moldova, in Romania. From an exclusively energetic point of view, differences between the two beddings are not significant, since they both belong to the biomass class; if the biomass bedding lacks (very rare), the energy characteristics of the poultry manure get worse. The second part introduces a technology suitable for this kind of waste combustion. Starting from the energy properties, thermal conditions for ignition and flame support are investigated. The boiler types adequate for the process are specified, appropriate thermal power range is indicated. Considering the very difficult manipulation of this particular waste, its use is recommended for thermal energy production. Local utilization is taken into consideration, especially for heating purposes, for instance of the production halls. According to the results of this study, boilers equipped with mobile grate combustion installations and using gaseous or liquid hydrocarbons fuel aid are expected to have good yields for energetic valorization of poultry waste.
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