Download or read book Combustion Performance and Fly Ash Emission Control for an Unreactive Western Coal written by H. Wahley and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Western bituminous coals from the Rocky Mountains are often of low volatility and contain unreactive macerals which are not easily burned in compact boilers designed for more reactive coals. Incomplete combustion leads to further disadvantages due to the contamination of fly ash with unburnt combustible matter. This makes it difficult to collect the fly ash in electrostatic precipitators (ESP) and subsequently to dispose of it as a useful residue, e.g., cement additive. The Canadian Combustion Research Laboratory (CCRL) has evaluated the combustion performance of an unreactive Western Canadian bituminous coal . A study has been made of the influence of the coal's combustion history and particle size distribution on its combustion properties, fly-ash characteristics and subsequent particulate emissions. Also, the influence of blending the coal with a more reactive coal has been examined. By using ash monitoring technique, it has been shown that it is possible to correlate fly-ash resistivity with carbon content and eventually perceptibility in a pilot-scale ESP. It has been found that the combustion efficiency of the coal improves with longer furnace residence times and with smaller input coal feed sizes. The influence of the carbon content of the fly-ash on its resistivity exhibited the usual "S" type curve with the abrupt decrease occurring at about 7% carbon. experience has shown that precipitator performance will deteriorate at higher carbon levels. Generally, it is possible, by using pilot-scale combustion evaluation techniques, to determine options for the use of unreactive coals in boilers that were not designed for them and which satisfy both the combustion performance and particulate emission requirements of these boilers.