Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10274737 | Fuel Processing Technology | 2011 | 6 Pages |
Abstract
Oxy-fuel Circulating Fluidized Bed (CFB) combustion technology, a very promising technology for CO2 capture, combines many advantages of oxy-fuel and CFB technologies. Experiments were carried out in a 50Â kWth CFB facility to investigate how operation parameters influence the NO emission in O2/CO2 atmospheres. The simulated O2/CO2 atmospheres were used without recycling the flue gas. Results show that NO emission in 21% O2/79% CO2 atmosphere is lower than that in air atmosphere because of lower temperature and higher char and CO concentrations in the dense bed. Elevating O2 concentration from 21% to 40% in O2/CO2 atmosphere enhances fuel-N conversion to NO. Increasing bed temperature or oxygen/fuel stoichiometric ratio brings higher NO emission in O2/CO2 atmosphere, which is consistent with the results in air-fired CFB combustion. As primary stream fraction increases, NO emission increases more rapidly in O2/CO2 atmosphere than that in air atmosphere. Stream staging is more efficient for controlling NO emission in oxy-CFB combustion than that in air combustion. Oxygen staging provides an efficient way to reduce NO emission in oxy-CFB combustion without influencing the hydrodynamic characteristic in the riser.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Lunbo Duan, Changsui Zhao, Wu Zhou, Chengrui Qu, Xiaoping Chen,