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: A boiler comprising a fluidized bed combustion chamber which communicates with an exchange enclosure containing water tubes heated by the combustion tubes and within which is arranged an exchange and dust removal chamber equipped with water tubes and containing a vertical internal partition dividing it into two half chambers communicating with one another. One of these half chambers communicates with the upstream part of the enclosure through an inlet orifice situated at the top part and constrains the fumes to follow a descending path along the partition, while the other communicates with the downstream part of the enclosure through an outlet orifice situated at the top part and constrains the fumes to follow an ascending path.

Abstract: The present invention relates to a process for modifying the properties of a swelling coal, to an installation for carrying out the process and to a chamber for treatment by fluidization and crushing. A percussion-type crusher is installed in a fluidization chamber at about 1 meter above the zone of connection between a duct for conveying coal by pneumatic transport and the chamber. A combustion chamber produces gases for transport and fluidization, having an oxygen content of at least 10%.

Abstract: In the pre-heating of coal the coal is entrained and/or fluidized in a heat exchange chamber by a heat-transfer gas which pneumatically conveys the coal from the chamber through a duct to a separator in which the coal is separated from gas. A hydrocarbon binder in a liquid state is injected into the coal in the duct through which the coal is being pneumatically conveyed by the gas to the separator.

Abstract: A process and an installation for the treatment of combustible granular or pulverulent material by drying and/or heating is disclosed. In one installation discharge gases are separated from dust in an electrostatic dust remover. Gases which have been partially recycled are divided between a direct recycling line and a path including the dust remover and a further duct so that the appropriate amount of gas is subject to dust removal to provide a desired throughput of gas. The dust captured by the dust remover is trapped in a hot liquid hydrocarbon and then used as a supplementary hydrocarbon binder.