Abstract:

Power generation from coal and biomass is an attractive technology because NO_x formation is greatly reduced by it. In the circulating fluidized bed combustion (CFBC) as temperature is about 850^oC so formation of NO_x is reduced. The formation of NOx can also be further reduced by air-staging. Moreover using CaCO₃, SO_x can be easily captured. CFBC is also attractive because the low quality coals along with the waste products can be used for electricity generation purposes. The combustion efficiencies in CFBC range from 97-99.9%. CFBC boilers with capacities of up to 800 MW are commercially available. Now-a-days 46GW electricity is being produced by using CFBC all over the world. The major challenge is to reduce the emission of CO₂ to the atmosphere. Intensive research and development is ongoing to develop for carbon capture and storage (CCS). Coal (taken from Chakwal) and corncob (taken from Fort Abbas) is co-fired for the generation of power in a circulating fluidized bed combustor having diameter 0.161m and 6m height having electricity production capacity of about 123KW. The major objective was to study the heat transfer effect in CFBC. All the experiments are performed using 15% composition of biomass (corncob) along with coal.