Abstract: A counterflow heat exchanger comprises facing parallelly coaxially extending upper and lower tube plates wherebetween extends a tube nest including a plurality of tubes. The tubes, which are distributed substantially in a polar symmetry arrangement, have at one end an S-like bent portion and the thermal exchange zone defining rectilinear portion of the tube nest is enclosed within an annular interspace defined between an inner jacket and an outer shroud fixed to the tube plates.

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.

Abstract: A series of tubes wound in spiral, spaced relation in pressure contact with the next inner tube or a central cylinder to form, between them, a spiral path for one liquid flowing upwardly in the space between the tubes, while another liquid flows downwardly in the tubes. The outermost tube may be enclosed by a sheath in pressure contact therewith, while several sets of tubes, separated by corresponding sheaths, may be utilized. The diameter of the tubes may be varied for the sets to compensate for the greater length of tubes at an outer position, so that an approximately equal time of travel from one end of the tubes to the opposite ends may be obtained. The spacing between the successive turns of the coils is preferably a distance corresponding to one half the diameter of the tubes.

Abstract: A U-tube type heat exchanger is provided with means for uniformly distributing shell side fluid across the lateral expanse of the tube bundle. The distributor means includes first and second upstanding plates between which are connected several ribs.

Abstract: A U-tube heat exchanger for the heat transfer from a primary gas circuit to a secondary gas circuit in a high temperature reactor. At the high temperatures of approximately 950.degree. C., the additionally permissible stresses on the used materials are low. The cold gas collector is therefore flexibly attached at the housing. The arrangement permits complete and also remote-controlled testing from the secondary gas-side of all parts of the primary gas circuit which are stressed by pressure. The flexible elements are neither stressed by the weight of the heat exchanger nor endangered by high temperatures.

Abstract: A heat exchanger has a cylindrical shell closed at its ends. A large conduit of circular cross-section, which extends longitudinally through the shell, is concentric with the shell to define a central passage for a first heat exchange medium such as a cool gas, and an outer annular passage for a second heat exchange medium, such as a hot liquid. Four radially oriented fins divide the two passages into quadrantal chambers or zones, and two tubes, one extending into each end of the shell, carry the second medium into and remove it from the annular passage.

Abstract: A recuperator which includes vertically extending outer tubes and respective inner tubes within the outer tubes. Hot waste gases flow around the outside of the outer tubes. Air to be preheated flows through the inner tubes and annular passages between tubes. The outer tubes are formed of relatively short length sections of ceramic joined end-to-end. The lowermost sections rest on solid base blocks which support the weight of the outer tubes.

Abstract: A nuclear steam generator modularized wrapper assembly comprising at least two separate generally cylindrical wrapper modules with tube support plates therewithin are assembled in stacked relation and joined within the nuclear containment building, the assembled modules then being placed in the shell with the tube apertures in the tube support plates being aligned with the tube apertures in the tube sheet, and a plurality of adjustable spacer means fixed to the outer circumference of the wrapper assembly are provided and are adjusted to vary the width of the space in the annulus between the wrapper and shell at various locations to lock the assembly in place with axial alignment of all of the apertures in the tube support plates and tube sheets.

Abstract: A range ventilator is provided in a space with a heat exchanging partition between the contaminated exhaust air and the inflowing outside air. A duct for the exhaust air is formed between the heat exchanging partition constructed in the form of a cylinder of curved corrugated sheet metal and a cylindrical cover which can be disassembled into two halves, around the middle section of the sheet metal cylinder.

Abstract: A multitubular heat exchanger used as a feedwater heater in a power generating plant and the like includes a shell, a high temperature tube bundle and a low temperature tube bundle composed of a multiplicity of U-shaped heat transfer tubes arranged in the shell and a vent tube interposed between the two tube bundles. A laterally-closed flow passage is defined in at least one of the high temperature tube bundle and the low temperature tube bundle to induce part of a heating medium flowing between the shell and the tube bundle to flow to a position deep in the tube bundle and near the vent tube, so that a noncondensable gas stagnating zone formed in the tube bundle can be moved near to the vent tube and noncondensable gas can be removed from the shell by extraction through the vent tube.

Abstract: A method of suppressing formation of heat exchange fluid particles into standing waves is provided. Pursuant to the method a plurality of metal fins attached to a plurality of tube sections extending within a shell are disposed within a heat exchanger shell such that the fins extend parallel to the tube sections and parallel to the direction of flow of fluid through the shell. The fins define with the tube sections a barrier adapted to interrupt movement of columns of fluid particles in a direction perpendicular to the direction of flow of fluid through the shell.

Abstract: A multitubular heat exchanger mainly used in thermal and nuclear power plants having a plurality of tube bundles located within a shell and including a large number of U-shaped heat transfer tubes for permitting a medium to be heated to flow therethrough, and a vent tube interposed between the tube bundles and arranged in the longitudinal direction of the shell, further includes at least one flow guide plate with or without at least one slit disposed in or near the outer marginal portion of one of the tube bundles for inducing streams of a heating medium to flow toward the vent tube. The provision of the guide plate with or without the slit has the effect of moving a heating medium stagnating zone, which has hitherto been located in one of the tube bundles, to a position which is in the vicinity of the vent tube to thereby prevent corrosion of the heat transfer tubes by noncondensable gas.

Abstract: A feed-water preheater for a steam power plant is disclosed. Feed-water at a relatively low temperature is conducted through bundles of heater tubes in heat exchange relation with steam from the turbine. The heater tubes are arranged in a U-shaped bundle, with one leg of the U serving as the cold inlet side and the other leg of the U serving as the warm outlet side of the heat exchanger. A partition extends lengthwise of the heater tubes between the legs and the U-shaped bundle. The steam inlet is located at the warm outlet side of the tubes and the housing forms a steam chest around the tubes. Deaerating pipes are provided on each side of the partition in the center of the bundle of heater tubes with openings spaced along the length of the deaerating pipes for receiving the noncondensable gases from the steam, and to draw off the gases through the deaerating pipes.

Abstract: A heat-exchanger shell comprises a tube of generally cylindrical shape subdivided by a planar diametral partition plate into a pair of compartments. At each axially extending outer edge of the partition plate there is provided a one-piece seal unitarily formed of a pair of generally parallel inner flanges defining a groove in which the respective outer edge of the plate is snugly received and a pair of oppositely outwardly directed flanges bearing tightly radially outwardly on the inner wall of the tube. The seal may be made of a profiled piece of elastomeric synthetic-resin material, or of a piece of austenitic sheet steel. The shell is assembled by deflecting the inner flanges elastically apart and fitting them over the outer edges of the plate, then sliding the plate with the seals into the tube with simultaneous inward deflection of the outer flanges of the seals.

Abstract: A system is disclosed for promoting selective shell-side flow distribution between and providing structural support for modular straight tube bundles in a heat exchanger or the like, wherein a plurality of flow guides, each of which includes three axi-symmetrically-located radial panels, are connected along their outer radial edges to form a polygonal array establishing mutually shared partitions between modular tube bundles. Various flow guide configurations permit gaps in the mutually shared partitions to promote uniform shell-side communication between the modules, and accommodate individual tube bundle support grids in assembled relation with the flow guides.

Abstract: A water cooled material additive chute for introducing fluxing material into a furnace including water cooled inlet and outlet chambers meeting at a tip or nose portion, a local coolant water injection pipe extending through one of the chambers and into the tip region to augment the cooling efficiency of the water coolant, and a pipe structure which accommodates thermal expansion.

Abstract: A heat exchanger for heating liquids with other liquids or vapors. An inner flow tube is carried concentrically within an outer flow tube to define an inner passage and also an annular passage. A first manifold directs all of the incoming fluid from one fluid source to either the inner or annular passage. A second manifold directs all of the incoming cooler fluid from the other fluid source to the other passage. A third manifold at the other end of the outer tube discharges the fluid from it so that it does not mix with the inner tube fluid. The outer tube is immersed in inner tube fluid to cause heat transfer through the walls of the inner tube and outer tube.

Abstract: An illustrative embodiment of the invention has a group of three concentrically disposed banks of helical steam generator tubes. Shrouds interposed between each of these three tube banks establish liquid barriers between the individual banks that prevent liquid sodium (or other shell side working fluid) from enjoying free communication throughout all of the tube banks. In this way, potentially damaging leakage between the shell side working fluid and the water within one of the tube banks can be isolated through discontinuation of the shell side working fluid and feedwater flow to the leaking bank, thereby permitting the remaining sound tube banks to continue functioning.

Abstract: The structure of the present invention employs a device at a heat exchanger for two media having parallel tubes with surface enlarging pins and passing through one of the media and about the second medium in a direction substantially parallel to the first medium where the tubes are positioned in a casing with a chamber at each end. Filler material is provided in the spaces between the tubes and the casing. The filler material is hollow at its ends and opens each into a chamber which is positioned in the casing.

Abstract: A heat exchanger in which water tubes are heated by liquid sodium which minimizes the results of accidental contact between the water and the sodium caused by failure of one or more of the water tubes. A cylindrical protective tube envelopes each water tube and the sodium flows axially in the annular spaces between the protective tubes and the water tubes.

Abstract: A cylindrical inner vessel containing the reactor core is placed coaxially within a main vessel. Heat exchangers are disposed within the annular space formed between the two vessels, each heat exchanger being delimited by an outer shell and a coaxial inner shell which surrounds a central feed duct having a vertical axis. The upper end of the annular space communicates with a flared end portion of the central duct through a first circular window formed in the inner shell. The lower end of the annular space communicates with the region located between the inner vessel and the main vessel through a second circular window formed in the outer shell.

Abstract: Water is circulated within tube bundles located in spaced relation within the generator casing and converted to steam by exchange of heat with a liquid metal which is fed into the casing through a central axial tube. The liquid metal is distributed within adjacent compartments which are formed by radial partitions extending from the central tube and each accommodate at least one tube bundle. A small gap is formed between the radial partitions and the casing so as to provide a communication between adjacent compartments and to equalize the level of liquid metal.

Abstract: U-tubes in a heat exchanger are arranged so that at intervals about the periphery of the tube bundle lanes are formed in the layout for more evenly distributing the flow of downcomer fluid through the entire bundle. Ducts are also provided for distributing downcomer fluid into upper portions of the bundle, the ducts providing a one-way communication between the downcomer area and the central portion of the bundle providing both circulation of fluids and preventing backflow of steam formed in the heat exchanger into the downcomer area. A torus header has outlet nozzles communicating with the lower portion of the heat exchanger which header introduces makeup water to the exchanger which is directed through the nozzles at the top surface of the tube sheet for reducing sludge buildup thereon.

Abstract: A heat exchanger of the straight tube type in which different rates of thermal expansion between the straight tubes and the supply pipes furnishing fluid to those tubes do not result in tube failures. The supply pipes each contain a section which is of helical configuration.