08-10-2016, 03:01 PM
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What is coal? Formation, sources, applications.
Coal combustion description.
Coal power plants and air pollution: Mechanisms and control technologies.
Coal and air pollution in Israel.
Coal – what is it?
Inhomogeneous organic fuel formed mainly from decomposed plant matter.
Over 1200 coals have been classified.
Coal Applications
Homes – heat and cooking
Transportation – steam engines
Industry – metal works
Electricity – power plants
The physical processes influencing pulverized coal combustion
Turbulent/swirling flow of air and coal.
Turbulent/convective/molecular diffusion of gaseous reactants and products.
Convective heat transfer through the gas and between the gas and coal particles.
Radiative heat transfer between the gas and coal particles and between the coal/air mixture and the furnace walls
Organic Compounds
Include volatile, semivolatile and condensable organic compounds either present in the coal or formed as a product of incomplete combustion.
Characterized by hydrocarbon class: alkanes, alkenes, aldehydes, alcohols and substituted benzenes.
The main groups of environmental concern are:
tetrachloro- through octachloro- dioxins and furnans.
Polycyclic organic matter (POM).
Emissions dependent on combustion behavior in the boiler (air/fuel ratio, residence time, temperature or turbulence