To reduce greenhouse gases emission and increase the
renewable energy utilization portion in the
world, the biomass gasification coupled with a coal-fired boiler power
generation system is studied. It is a challenge to achieve optimum performance
for the coupled system. The models of biomass gasification coupled with
co-firing of coal in a boiler have been established. A comparative study of
three 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 MWe
coal-fired boiler for co-combustion, and the co-firing performances have been
compared with pure coal combustion case under the conditions of constant boiler
load. Results show that co-firing decreases the furnace combustion temperature
and raises the flue gas temperature for Food Rubbish and Straw, while, flue
gases temperature decrease in case of Wood Pellets. At the same time NOx
and SOx emissions have reduced. The system efficiencies
at constant load for Food Rubbish, Straw and Wood Pellets are 83.25%, 83.88% and 82.56% when the optimum conditions of
gasification and co-firing process are guaranteed.
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