Abstract: The present invention is to provide a steam heating boiler, which can be implemented by combining steam table and steam cabinet; said boiler includes a hollow upper groove thereabove and a hollow bottom groove therebelow; the top opening of said upper groove is sealed, and the volume of the hollow bottom groove protruded downwardly from the lower part of the said upper groove, the upper part of said bottom groove communicated with the lower part of the upper groove, and the lower part of said bottom groove is sealed, so that water can flow freely inside the upper groove and bottom groove.

Abstract: System for recovering latent and sensible heat of effluent gases from a cupola for cast iron production or other similar melting installation consequent intermittent operation thereof, for obtaining heat energy or potential electric energy in the form of hot water and/or steam, comprising a thermal unit including an air burner and combustion chamber for burning the effluent gases to form hot combustion gases, two vertical waste heat boilers disposed in series along a flow path downstream of the combustion chamber, the first being a water tube boiler and the second being a fire tube boiler, both having vertical tubes arranged so that the hot gases pass upwardly through the water tubes, thereby licking such tubes, and upon flow reversal thence pass downwardly through the fire tubes, thereby enhancing the self-cleaning thereof, an economizer and optionally a combustion air preheater downstream of the second boiler, and a chimney for the fumes at the end of the flow path, as well as a common external steam separa

Abstract: Hot water or steam boiler comprising a furnace section and a convection section in which the furnace section is limited by a wall section formed of liquid or steam tubes placed side by side, said tubes being arranged transversal to the flue gas flow and at fixed interrelated distances to form slots allowing passage of gas or steam.