Economics of fuel alternatives - oil, coal and bark boilers

A method for comparing the relative economics of burning oil, bark or wastewood, and coal to generate steam is illustrated through several case plans. It was assumed that a 150,000-lb/h (68 ton/h) boiler will generate 600-psig (4134-kPa), 700 degrees F (371 degrees C) steam, that it will be added to an existing steam generating plant, and that it will be connected to the existing main steam header and to the boiler feedwater discharge header. The scope of new construction is therefore limited to the following equipment and their related structures: boiler, fuel handling, combustion controls, burner, safety system, draft fans, particulate collection, ash handling, stack, foundations. Plans involving bark, wastewood, and coal fuels are based on the assumptions that the plant has