Experience of Cofiring Waste with Coal
AUTHOR: Robert M. Davidson
DATE: February 1999
This report is the third in a series examining the role for coal in generating energy from waste. This report examines the experience gained in co firing wastes with coal in commercial power plants, test facilities, and laboratory-scale investigations. Individual chapters cover; availability, preparation, and feeding; combustion; slagging, fouling, and corrosion; emissions and their control; ash quality; and hybrid and parallel systems. There are two main attitudes to cofiring. One regards coal as the problem, largely due to the quantities of carbon dioxide produced and their enhancement for the greenhouse effect. Cofiring, especially with 'CO2-neutral' biomass, is a way of displacing coal as a fuel and thus reducing greenhouse gas emissions. The other attitude sees coal as the solution, largely to the increasing problems of waste disposal. Here, the more stable combustion characteristics and the lesser environmental impacts of coal are used to deal with wastes that otherwise would be landfilled or, if incinerated alone, would lead to more undesirable emissions to the atmosphere.