Abstract: A method and apparatus for the operation of a stoker-fired boiler having a boiler arranged coaxially adjacent to a stoker chamber. The cross-sectional area of the connection between the stoker and the boiler is constricted, preferably in the range of one-third to one-fourth of the cross-sectional area of the stoker chamber, so that the flammable gases flowing from the stoker to the boiler are accelerated and generate a reduced pressure at the constricted connection. Tertiary air is introduced at the circumference of the constricted connection at an increased pressure, to thereby induce more complete combustion of the gases. The area of flow flares out as the gas enters the boiler. In the preferred arrangement, guide means control the introduction of the tertiary air through an annular gap at the constricted connection The stoker also preferably includes rings of nozzles arranged at selected angles to introduce secondary air into the stoker chamber.

Abstract: A bin having an essentially round or polygonal cross section with a discharge device, especially for flour, shaving or chip-type goods, such as wood shavings, sawdust, wood chips or the like, including a bin floor with at least one discharge opening channel underneath it for a conveyor worm or the like conveyor element in the channel and a drivable supporting body situated above the bin floor including pusher type discharge elements, at least some of which are limited on one longitudinal side by a carrier edge directed steeply to the bin floor, which pusher type discharge elements and supporting body form an essentially rigid unit of an outline conforming to the cross section of the bin, and a reversing drive for the rigid unit for alternately driving it in opposite directions.