Modelling primary NOx and primary N2O of Pulverised, Fuel Combustion and Circulating Fluidised Bed Combustion (Frans van Dijen) - Print

ABSTRACT

With more stringent emission limits with time, including NOx and N₂O, and due to the high costs of secondary measures for NOx emissions reduction, knowledge of primary NOx and primary N₂O is very important. With this knowledge, primary NOx and primary N₂O can be reduced at low costs and in this way costs for secondary measures are much reduced as well. By applying the knowledge presented, the project costs of a CFBC plant can be lower than those of a PFC plant.

Knowledge regarding primary NOx and primary N₂O, and their models, is useful for operators of PFC and CFBC regarding the influence of (the change of):

• Fuel, with PFC and CFBC
• Lambda, with PFC and CFBC
• Temperature, with CFBC
• Addition of limestone to the bed, with CFBC.

Knowledge regarding primary NOx and primary N₂O, and their models, is useful for suppliers of boilers, burners, etcetera, regarding the influence of (the change of):

• Design, with PFC and CFBC
• Fuels and fuel flexibility, with PFC and CFBC
• Conversion of the boiler for other fuels, with PFC and CFBC
• Developing assisting systems / software, with PFC and CFBC
• Temperature, with CFBC
• Addition of limestone to the bed, with CFBC.

With this thesis, the mathematical models of primary NOx of CFBC, primary NOx of PFC and primary N₂O of CFBC were improved. The models are based on chemical aspects, such as thermodynamics, kinetics and reaction mechanisms.