Industrial Design of New Generation of Power Plants Based on Oxy-Fuel Technology

This work presents the design of large utility-scale oxy-fuel boilers based on two industrial pathways of constant thermal power scenario and constant furnace size scenario. The work is based on a comprehensive test campaign in 100 kWth and 4 MWth oxy-fuel test units which led to a comprehensive modeling tool developed by the author. The results suggest that the major strategy for increasing the heat extraction outside the furnace is to use cyclones with high efficiency leading to a higher share of fine particles and nanoparticles in the boiler loop while the amount of aerosols is reduced. The furnace wall heat flux maxima is in constant furnace size scenario is around double of the corresponding values in constant thermal power scenario. Thus the combustion is more intense constant furnace size scenario which increases the rate of NOx generation in addition to tube damage risks. It is also concluded that the operation of the oxy-fired boilers at high O2 concentrations is much safer in constant thermal power scenario is compared to constant furnace size scenario. It is also concluded that the aspect ratio of new oxy-fuel CFB furnaces are to bigger than the typical furnaces and consequently approaching the fluid catalytic cracking fluidized beds.