The influence of air staging on the ‘NO’ emission from a fluidised bed coal combustor

O2/CO2 coal combustion characteristics in a 50 kWth circulating fluidized bed

“…What is different between air staging and O 2 staging on NO reduction is that, during O 2 staging, the high concentration of CO 2 results in higher CO concentration in the primary zone than air staging, which may enhance the NO/CO/Char reaction (Okazaki and Ando, 1997) and reduces NO emission. The NO reduction from 43% O 2 concentration in the primary oxidant to 14% O 2 concentration in the primary oxidant is about 76% for bituminous coal and 62% for anthracite, which is much higher than air staging, normally less than 50% (Gibbs et al, 1977).…”

Heat transfer and combustion in a two-bed fluidized combustor

“…However, NOj formation also increases with combustion bed excess air. Experimental observations agree qualitatively with other researchers who concluded that, to minimize NO,p emissions, the combustion bed should be op erated sub-stoichiometrically at low combustion bed temperatures[12,3,29]. Emis sions of NO,r ranged from 0.08 to 0.27 kg/GJ.…”

Combustion and NOx Emission Characteristics of Shenmu Char in a Circulating Fluidized Bed with Post-combustion

“…However, the advantage is weakened under the new stringent emission limit. NO x emission from CFB combustion depends upon many operating parameters, among which air stoichiometric ratio (λ) − and the secondary air (SA) arrangement − in air-staging combustion are of great importance. Zhou et al have explored the possible measures to control the NO x emission down below 100 mg/m 3 .…”