Abstract: A heat exchanger for cooling cracked gas with several cooling pipes (4), each accommodated in an outer pipe (6). The cooling pipes are welded at each end to a water chamber (7 & 8) that supplies and receives a coolant. Each water chamber is in the form of a straight and solid component with separated round depressions (11) in it. Each depression accommodates a single cooling pipe. The diameter of the depression is as long as or longer than the inside diameter of the outer pipe. The depression has an annular base (12) with thinner residual walls in the vicinity of the ends of the cooling pipe. The straight and solid components that comprise the water chamber consist of individual sections (7.1, 7.2. & 7.3 and 8.1, 8.2, & 8.3), each with a single depression that accommodates a cooling pipe which are all fastened together.

Abstract: A heat exchanger for cooling cracked gas. At least one cooling pipe (4) is enclosed in an outer pipe (6). Both pipes are welded at each end to a water compartment (7 & 8). The water compartment supplies and removes a coolant. Each water compartment comprises a solid strip with as many separated and circular depressions (11) introduced into it as there are cooling pipes. Each depression surrounds a cooling pipe. The diameter of each depression equals or exceeds the inside diameter of the outer pipe. Each depression has a thin annular floor (12) with a slight residual thickness in the vicinity of the ends of the cooling pipes.

Abstract: Water compartment for a heat exchanger (1) for cooling hot gases, with a jacket (5) and a thinner pipe slab (6) that rests on a thicker pipe slab (7) by way of the jacket and of anchor pipes (8), whereby the anchor pipes are accommodated in the jacket and fastened to the slab and whereby gas pipes (13) extend through the anchor pipes leaving a cylindrical space, characterized in that the gas pipes are elongated and extend beyond the thinner pipe slab, in that their elongated ends (14) are reversed outside, in that the reversed ends (15) are fastened tight to the thinner pipe slab radially remote from the anchor pipes, and in that bores (17) extend through an annular area of the thinner pipe slab between the reversed ends of the gas pipes and the anchor pipes.

Abstract: The shape-dictating surfaces of the pattern are constituted by a thin self-supporting shell (4 & 5) of photocured polymer. The shell is produced by a laser controlled by a computer with reference to a design drawing. The inside of the shell is packed full of low melting-point modeling compound. The areas (6 & 7) of the pattern that do not dictate shape are demarcated by the low melting-point modeling compound.

Abstract: A heat exchanger for cooling synthesis gas generated in a coal-gasification plant has heat-transfer pipes (1) that the gas flows through, that are secured in two slabs (2 & 3) of piping, and that are enclosed in a jacket (4). The gas intake-end piping slab (2) is protected by a layer of ceramic flooring. The flooring consists of adjacent block-shaped sockets (12), each of which has an opening (15) that tapers together conically into a pipe section (14) that extends into one of the pipes (1).

Abstract: A heat exchanger for cooling hot reaction gas with a coolant. It rests on a gas-supply compartment (4) and has gas-conveying pipes (9) inside a jacket (1). It is separated from the gas-supply compartment by a tube sheet (6) that accommodates the gas-conveying pipes (9). The pipes extend loosely through the tube sheet, leaving annular gaps (10) and are connected tightly to the tube sheet on the side where the gas enters. The heat exchanger has at least one line (12) for supplying coolant to the side of the tube sheet that faces away from where the gas enters. The diameter of the tube sheet is shorter than that of the jacket. The tube sheet is connected to the lower edge of the jacket by way of an upward-tapering cone (7). The tube sheet is provided with cooling channels (15) that are open at least at one end and communicate with the lines that supply the coolant.