(DE4217070-A)      The chamber has a lower travelling-grate stoker (5) moving from rear to front of the chamber. The front wall (2) has a coal feed porter (7) with a spreader (6) to scatter coal onto the stoker, and a chute (11) discharge into the chamber above the stoker and has a rotary valve (13) to feed rubber scrap sequentially onto an ash zone formed by burned coal on the stoker.    The chute pref. extends through a sidewall and discharges into the chamber within 40-80% of the distance from front to rear wall. The rotary valve pref. operates with airtight sealing between feed and discharge sides. The spreader pref. casts large block farther into the chamber to form a uniform thickness of coal on the stoker.    USE/ADVANTAGE -   E.g. for firing a boiler, provides effective utilisation of metal-contg. rubber scrap such as used tyres and tyre mfg. waste, molten metal being solidified in the ash zone so that it does not bind directly to the grate and cause clogging.    (US5226375-A)      A combustion chamber has a travelling grate stoker (5) movable in a lower part between rear and front parts of the chamber. The front wall has a coal feed port (8) with a spreader (6) to scatter coal onto the stoker, and a chute (10) discharges into the chamber to form a rubber feeder in at least one sidewall of the chamber above the stoker. The chute has a rotary valve (13) to feed rubber scrap onto an ash zone formed by burned coal on the stoker. The chute pref. extends within a span corresp. to 40-80% of the distance between front and rear walls. The valve pref. revolves in airtight sealing relation during the phase between the feed and discharge sides of the valve.    USE/ADVANTAGE -   Used partic. for disposal of used tyres and provides efficient utilisation.    (DE4217070-C2)      This incinerator process and equipment has a chamber (1) with at its base a conveyor belt (5). An inlet port (10) is connected by a pipe (11) with a paddle (13) which controls the flow of material to be burnt. A second inlet (7) has a delivery screw and spreader (9 & 6) which ensures a regular and even charge of coal.    As the coal burns it produces a layer of ash on the conveyor belt on which the material burns. The particular material type is metal reinforced rubber ie tyres which has been previously cut into small pieces.    USE/ADVANTAGE -   In disposal of used tyres. It allows use of the energy produced by the burning rubber which is consumed efficiently and easy disposal of the metal reinforcing.