N2O EMISSION CONTROL IN COAL COMBUSTION

Interactions among SO(x), NO(x) and N2O, as well as among methods for their abatement, are discussed and guidelines for the development of N 2O control in fluidized-bed combustion (FBC) are proposed. An integrat ed approach to pollution control is advocated rather than treatment of each pollutant separately. Improvements in operating conditions, star t-up procedures and process control are examples of low-cost measures. However, innovative combustor design is required to produce low-emiss ion systems that would meet increasingly stringent standards. Temperat ure optimization itself is insufficient; gas afterburning and solid-ca talysed N2O decomposition are identified as the most promising measure s. FBC flue-gas treatment is deemed unattractive, unless it can be mad e inexpensive and easy to install or retrofit.