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System Performance and Pollution Emission of Biomass Gas Co-Firing in a Coal-Fired Boiler

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Document pages: 8 pages

Abstract: To reduce greenhouse gases emission and increase therenewable energy utilization portion in theworld, the biomass gasification coupled with a coal-fired boiler powergeneration system is studied. It is a challenge to achieve optimum performancefor the coupled system. The models of biomass gasification coupled withco-firing of coal in a boiler have been established. A comparative study ofthree kinds of biomass (Food Rubbish, Straw and Wood Pellets) has been done. The syngas produced in a 10 t h gasifier is fed to a 330 MWecoal-fired boiler for co-combustion, and the co-firing performances have beencompared with pure coal combustion case under the conditions of constant boilerload. Results show that co-firing decreases the furnace combustion temperatureand raises the flue gas temperature for Food Rubbish and Straw, while, fluegases temperature decrease in case of Wood Pellets. At the same time NOxand SOx emissions have reduced. The system efficienciesat constant load for Food Rubbish, Straw and Wood Pellets are 83.25 , 83.88 and 82.56 when the optimum conditions ofgasification and co-firing process are guaranteed.

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