METHOD OF DECREASING PARTICULATE AND GASEOUS EMISSIONS AND RECOVERING HEAT WHEN BURNING OR SMELTING SUBSTANCES CONTAINING ASH AND SULPHUR

摘要

A method for the combustion of fuels containing ash and sulphur or for the smelting of substances and the recovery of heat so that simultaneously inorganic compounds (ash) and, when required, sulphur oxides, are separated from the gases. In the method according to the invention the combustion or smelting is performed in a manner known per se by introducing oxygen in one or more stages. Gases containing melts and vapours can be cleaned by means of a smelt cyclone before the cleaning and heat recovery part. In the method according to the invention, the gases containing melts and vapours are conveyed to a particle cooler in which the temperature of the particles has been chosen so, typically T = 900oC, that the smelts and vapours stick onto the surface of the particles in the form of a solid layer. If the new particles being introduced to the particle cooler consist partly or entirely of a material forming sulphate, sulphur oxides can be simultaneously separated from the gas.