Abstract: The invention relates to a radiant-heating device for heating an industrial furnace using radiated heat. A first burner unit (1) comprises a first burner (2), which heats an air mixture by burning a fuel (6), a first air supplier (60), via which the first burner (2) is supplied with fresh air, and a first elongated radiant-heating pipe (20), which includes a rearward end (20a) connected with the first burner (2) and a forward end (20b) spaced from the rearward end (20a) and in which the hot exhaust gas generated by the first burner (2) flows from the rearward end (20a) to the forward end (20b) of the first radiant-heating pipe (20) and supplies heat energy along this path to the pipe wall of the first radiant-heating pipe (20). A second burner unit (1?) is constructed like the first burner unit (1).

Abstract: The burner has at least two fuel-carrying tubes which are arranged in parallel, the distance between adjacent fuel-carrying tubes being 5 to 30 cm. Each fuel-carrying tube is surrounded by a steam-carrying tube, which at its orifice end has a supply line for oxygen-containing gas. The steam-carrying tubes are surrounded by a common first cooling chamber through which cooling liquid is passed, the first cooling chamber constituting an annular chamber and extending into the area of the orifice ends of the steam-carrying tubes. Coaxial to the first cooling chamber a common second cooling chamber preferably is provided, which is surrounded by the first cooling chamber.

Abstract: A regenerative thermal oxidizer includes a heat exchange column formed of body which defines at least one entire flow passage through the heat exchanger. The structure of the heat exchange column assists in purging residual gas to be cleaned from the heat exchanger prior to that regenerative heat exchanger moving into a mode where it receives the cleaned gas. The heat exchanger columns preferably have 70 to 80 percent of their surface area used as the flow passages. In a further geometric arrangement made possible by the inventive heat exchanger described above, two heat exchanger columns are positioned on opposed sides of a combustion chamber. End faces of the two opposed heat exchangers transfer radiative heat energy from the hotter of the two heat exchanger end faces to the cooler of the two heat exchanger end faces. In this way, radiative heat energy is not lost, but is reused to heat the other of the heat exchangers.

Abstract: An improved ceiling beam construction for a heating furnace in which ceiling beams having closed cross sections are adopted for utilizing the interior of the beams as ducts for passing gases through them so as to reduce spaces required for installing separate gas ducts, with a consequent decrease in the number of duct supporting fittings or fixtures.

Abstract: A method and apparatus for calcining calcium sulphate dihydrate in a calcination vessel in which the dihydrate is heated in the vessel to calcination temperature not only by heat applied to the exterior of the vessel but also by hot gas, especially hot gaseous combustion products, supplied into the interior of the mass of calcining material within the vessel. The supply of hot gas according to the invention can improve the production rate in both batch and continuous calcination operations without adversely affecting the product quality, by permitting increase in the heat input to the vessel without entailing the risk of vessel bottom burn-out.