Abstract: A boiler in which the combustion unit includes a fluidized bed which may be fluidized in a non-uniform manner to effect circulation of the bed material. Heat exchange takes place between the combustion products and working fluid located in tubes located above the fluidized bed and also, optionally, within the fluidized bed.
Abstract: A method of disposing of waste products from the chemical process industries, especially as a result of the re-refining of oils. The waste products are burnt in a fluidized bed in which the bed material is fluidized in a non-uniform to effect circulation thereof so as to complete combustion at such a low temperature that the formation of sulphur trioxide and the volatilization of metals is avoided.
Abstract: A boiler wherein the combustion unit includes a fluidized bed which may be fluidized in a non-uniform manner to effect circulation of bed material by means of dual air distributors located within the bed.