Abstract
Coal, natural gas and fuel-oil are three major fossil fuels sources are vastly used in electrical power generation sector in Malaysia. In a coal fired power plant, the major byproducts resulting from coal combustion inside boiler is soot, ash and NOx emissions. Boiler fouling and slagging are common problems that leads reduces heat transfer rate in furnace and boiler efficiency. This happens when soot and ash is formed and deposited along the boiler tubes, furnaces and heaters. Hence, soot blowing operation is used to blow off steam in affected areas of boilers as a cleaning mechanism. However, current soot blowing operation is practiced through operator’s visual inspection of slagging or fouling rate in furnace. This leads to inefficient soot blowing operation that effects the plant’s operating and maintenance cost. Thus, by studying behavior of operating parameters, soot blowing operation can be optimized to reduce unnecessary soot blowing operation in power plant.
Highlights
Soot, ash and slag are main byproducts of combustion process in a coal fired power plant
All the necessary data is taken from the Plant Information (PI) station in TNB Janamanjung
Through analysis using Computational Fluid Dynamics (CFD), the factors that has been considered in soot blowing has been taken into account and simulated using this software
Summary
Ash and slag are main byproducts of combustion process in a coal fired power plant. These byproducts plays an important role that effects boiler efficiency. For insufficient soot blowing, the transfer of heat from flue gas to steam is impeded that causes the boiler efficiency to decrease. These results in large soot deposits that require additional fan power that will further reduce the efficiency. Too frequent cleaning causes heating surface erosion and related unit outages as increased spray flow reduces the efficiency of the boiler. The contribution to this work is to reduce the frequency of soot blowing that result reducing the steam consumption during soot blowing that will eventually increase the efficiency of boiler and reduce maintenance cost [5]
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