Abstract: A syngas cooler that includes an outer wall defining a cavity. A first membrane water wall is positioned within the cavity. A thermal siphon is positioned between the first membrane water wall and the outer wall and is configured to channel a flow of syngas therethrough to facilitate cooling the channeled syngas.

Abstract: A method of cooling syngas in a gasifier is provided. The method includes channeling cooling fluid through at least one platen that extends at least partially through a reaction zone of the gasifier, and circulating reactant fluid around the at least one platen to facilitate heat transfer from the reactant fluid to the cooling fluid.

Abstract: This exchanger comprises a pair of primary tubular bundles (5a, 5b) surrounding a fuel or gas burner (4a, 4b), and a secondary tubular bundle (6) on which condensation of the steam contained in the burned gases discharged from the primary bundles occurs, wherein the three bundles (5a, 5b, 6) are mounted parallel, side-by-side inside a gas-tight casing (10), and communicate with one another, with means being provided in order to circulate the water to be heated, between the tubes forming the secondary bundle (6) and the tubes forming the primary bundles (5a, 5b); the casing (10) is subdivided at the level of the secondary bundle (6) by a partition (7-70) that extends both inside and outside said bundle (6), with the arrangement being such that a only a circumferential section of the latter is capable of being contacted and traversed by the hot gases coming from one of the two primary bundles (5a), and its remaining section being capable of being contacted and traversed only by the hot gases coming from the oth

Abstract: A waste heat boiler which comprises a water chamber and a water vapor chamber, both surrounded by an opposed pair of tube plates, respectively, and a plurality of double tubes extending across the two chambers. The inner tubes within the double tubes are adapted to pass hot waste gases therethrough, while annular spaces defined between the inner and outer tubes within the double tubes are for directing water to be heated therethrough. At least one end area of the double tubes is of triplicate structure so that thermal stresses generated from thermal expansion of the tube elements may be absorbed effectively.