Formation and decomposition of N2O in fluidized bed boilers

Gas-potentiometric method with solid electrolyte oxygen sensors for the investigation of combustion

“…It can be concluded from the calculated E A -values, that in the case of coke the overall combustion process is mainly chemically controlled at combustion temperatures between 750 and 950°C, whereas in the case of coal and semianthracite the influence of mass transfer processes distinctly dominates. With E A -values of about 94 kJ/mol [23] and 98-104 kJ/mol [24] for several kinds of coke quite comparable values have been published recently. Whereas the first value was kept also in the case of fluidized bed combustion, the latter values are results of similar model considerations in a fixed bed reactor.…”

Mechanism study on the influence of in situ SO removal on N2O emission in CFB boiler

“…In the power generation sector, circulating fluidized bed (CFB) combustion is often applied for its wide fuel adaptability, high combustion efficiency and intensity, and lower NO x emission, etc. However, the reported N 2 O emission level even reached 360 mg/m 3 at part load condition for a CFB boiler with thermal output above 200 MW [3], which is much higher than conventional pulverized coal-fired power plants. The nitrogen chemistry in CFB combustion and other fuel utilizing industry has long been a research focus [4][5][6][7][8][9] but it is still not fully understood because of the complex coupling of in-furnace combustion, heat and mass transfer, homogeneous and heterogeneous chemical reactions, etc.…”

“…The nitrogen chemistry in CFB combustion and other fuel utilizing industry has long been a research focus [4][5][6][7][8][9] but it is still not fully understood because of the complex coupling of in-furnace combustion, heat and mass transfer, homogeneous and heterogeneous chemical reactions, etc. The dependence of N 2 O emission on important process parameters such as furnace temperature, excess air ratio, stoichiometry, with or without the presence of limestone was studied [3,[10][11][12][13], but the detailed mechanism still deserves more research effort.…”

Atmospheric Emissions from Forest Biomass Residues to Energy Supply Chain: A Case Study in Portugal

“…Both the amount of nitrogen in fuel and the fuel-O/fuel-N ratio have an effect on N 2 O emissions (Hämäläinen and Aho, 1996). N 2 O is formed not only from volatile nitrogen species (e.g., HCN) originating from fuel nitrogen but also from nitrogen of char and by heterogeneous reactions on the char surface (Bonn et al, 1995). Therefore, N 2 O formation can also take place, especially in fluidized-bed combustion, by the reduction of the initially formed NO by the char particles ( Jones and Thomas, 1995).…”