Biomass Fuel for process horizontal Steam Boilers

Using Biomass fuel for Process horizontal Steam Boilers Technical Report shows if the moisture content is too low for a given boiler design, combustion temperatures will increase and potentially cause problems with both flue emissions and ash-melting behaviour. Wood ash typically melts only above 1300 C, but other herbaceous fuels have ash-melting temperatures of ~ 1100 C. At excessive combustion temperatures, ash particles will condense on boiler tubes, heat exchangers and other boiler components and lead to corrosion or other irreparable damage to boiler parts.

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 szl biomass fired boilers. As a result, the main ash formation mechanisms are presented for coal and biomass combustion.

Biomass fuels are extremely variable in terms of heating value, moisture content, and other factors that affect combustion. Wood and most other biomass fuels are composed primarily of cellulose and moisture. As discussed previously, the high proportion of moisture is significant because it acts as a heat sink during the combustion process. The latent heat of evaporation depresses flame temperature, taking heat energy away from steam production, and contributing to the difficulty of efficiently burning biomass fuels. Cellulose, in addition to containing the chemical energy released in combustion, contains fuel-bound oxygen. This oxygen decreases the theoretical air requirements for combustion and, accordingly, the amount of nitrogen included in the products of combustion. Wood fired steam szl biomass fired boiler adopts three pass structure in designs to enhance heating combustion effect.

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