Abstract: A process for incinerating domestic refuse is implemented in a boiler comprising a fluidized bed furnace over which is a post-combustion chamber. The smoke passes through alternately upward and downward paths in which it is cooled in contact with walls provided with water tubes. Limestone is injected into the bed to fix the sulfur oxides and halogenated compounds and a jet of powdered lime is injected at the start of the third path to neutralize the remaining halogenated compounds; the flying particles deposited are recycled into the furnace. The temperature of the bed is held between 800.degree. C. and 900.degree. C. and the injection of secondary air is adjusted to obtain an oxygen concentration in the smoke between 5.5% and 7.5% to minimize the formation of nitrogen oxides, dioxins and furans.

Abstract: The fluidizing grid of the invention is essentially constituted by pipes (18) forming the diverging walls of the openings (17) through which the fluidizing air is blown. These pipes have a cooling liquid (water) flowing therealong, which water then flows through the heat exchange tubes of the boiler.

Abstract: Heat generator comprising a combustion chamber, a circulating bed and a recovery boiler. The circulating bed and the combustion chamber have a common wall. The present invention may be used to achieve the combustion of high sulphur content fuels.

Abstract: A fluidized bed heat generator with improved collector for ash removal and heat recovery comprises a central hearth having a fluidization grid at its lower end. The side wall of the hearth is enclosed by a hollow peripheral enclosure to define an intermediate volume therebetween which is connected both to the upper part of the hearth and to fume tubes. These fume tubes extend through the peripheral enclosure and open into a fume exit conduit such that fumes and entrained ash from the hearth can be directed via the intermediate volume and the fume tubes to the fume exit conduit. Water is arranged to circulate within the peripheral enclosure around the hearth and fume tubes.