Abstract: A plate for a heat exchanger has a longitudinal centerline, a reference plane parallel to the longitudinal centerline, and multiple corrugations provided in the plate that define flow channels through which fluid flows. The corrugations extend at an angle to the reference plane and at least some of the corrugations are intersected by the reference plane, wherein over at least a portion of a surface area of the plate the corrugations are arranged in sub-regions that have a longitudinal length and the corrugations of each sub region are at the same angle relative to the longitudinal centerline, and the corrugations of adjacent sub-regions are at different angles from each other, and wherein the corrugations in adjacent sub-regions meet at junctions and the junctions are not longitudinally aligned.

Abstract: A stacked plate heat exchanger includes a core having an outer periphery and a longitudinal axis, a shell having an inner periphery and at least partially surrounding the core to define a fluid gap therebetween. A seal between the shell and the core at least partially divides the fluid gap into an inlet chamber and an outlet chamber, and includes at least one core fin projecting generally radially outwardly and having at least one core fixed end proximate the outer periphery of the core and at least one core free end distal the outer periphery of the core, and also includes at least one shell fin projecting generally radially inwardly and having at least one shell fixed end proximate the inner periphery of the shell and at least one shell free end distal the inner periphery of the shell, and being interleaved with the at least one core fin.

Abstract: A heat exchanger includes a housing and a core having a shell. The shell may have an upper wall, a lower wall, and a pair of opposed side walls interconnecting the upper and lower walls to define at least part of an enclosure in which a fluid may be received. The housing may have an upper plate adjacent to the upper wall, a lower plate adjacent to the lower wall and a pair of side plates each adjacent to a separate one of the side walls. The upper plate may be connected to the lower plate and the side plates may be connected together to support the upper wall, lower wall and side walls of the shell. The support provided by the housing may, in at least some applications, permit use of a lower strength and less expensive shell.

Abstract: A heat exchanger may include a core control assembly movable between compressed and uncompressed positions, and a core. The core may have a plurality of layers with a plurality of passages interleaved therebetween, a portion of the passages extending and open to the periphery of the layers. The core control assembly may be operably coupled to the core to compress the core when the core control assembly is in its compressed position and to permit the core to expand from its compressed state when the core control assembly is moved away from its compressed position. The expansion of the core increases a cross-sectional area of the passages at the periphery of the core.

Abstract: A stacked plate heat exchanger includes a core having an outer periphery and a longitudinal axis, a shell having an inner periphery and at least partially surrounding the core to define a fluid gap therebetween. A seal between the shell and the core at least partially divides the fluid gap into an inlet chamber and an outlet chamber, and includes at least one core fin projecting generally radially outwardly and having at least one core fixed end proximate the outer periphery of the core and at least one core free end distal the outer periphery of the core, and also includes at least one shell fin projecting generally radially inwardly and having at least one shell fixed end proximate the inner periphery of the shell and at least one shell free end distal the inner periphery of the shell, and being interleaved with the at least one core fin.

Abstract: A plate heat exchanger having a first set of plate assemblies arranged alternately with a second set of plate assemblies in a stack. Each plate assembly has first and second plates which are spaced apart to define a flow path for fluid. The flow paths of the first set of plate assemblies extend in crossing relationship to the flow paths of the second set of plate assemblies. Because of the double wall design of the plate assemblies, any leakage will be vented before being able to corrode through to the other fluid. The plate assemblies have enlarged inlet and outlet openings for fluid to reduce pressure drop and pumping cost. One plate of each plate assembly has a first set of dimples to establish the space between plates and produce turbulence for good heat transfer, and a second set of dimples of reduced height to produce less pressure drop but still produce turbulence.

Abstract: A plate heat exchanger having a stack of plates with spaces between the plates defining passages for hot and cold fluids. The ends of the plates define inlet and outlet openings for the fluid passages. The openings are enlarged by bending the end of one of the two plates for each flow path away from the corresponding end of the other of these plates and welding it to an adjacent plate. Preferably the ends of the plates are triangular, or V-shaped, to lengthen the openings along each edge of the V.

Abstract: Each plate of the heat exchanger has the usual groove for receiving a gasket. The gasket has a main body portion secured to the bottom of the groove by spots of glue at spaced points along the length of the groove. The gasket is free of attachment to the groove between the spaced points. Nubs may be molded on the outer or inner edge of the gasket at spaced points to indicate where the glue is applied. The nubs lie in lateral extensions of the groove. The spots of glue, instead of being located in the groove proper to adhere the main body portion of the gasket, may be located in the groove extensions to adhere the nubs.

Abstract: A heat exchanger plate has an elongated peripheral groove spaced inwardly from the edge of the plate. Openings are provided in the outer side wall of the groove. A gasket has an elongated main body portion seated in the groove with integral tabs projecting through the openings. The tabs may be long enough to be grasped from the underside of the plate and pulled through the openings to fully seat the main body portion of the gasket in the groove. The tabs may also have shoulders engaged with an edge of the openings to retain the tabs in the installed position. Tabs are also disclosed which have a button on the outer end which will snap into the opening under downward pressure. As an alternative to gasket tabs, recesses may be formed in the main body portion of the gasket to fit under tabs on the outer side wall of the plate groove.

Abstract: A heat exchanger plate having a main groove spaced inwardly from the edge of the plate, and sub-grooves extending from the main groove toward the plate edge. Openings are provided in opposite sides of each sub-groove. A gasket of flexible, compressible material has a main body portion seated in the main groove and integral tabs seated in the sub-grooves with the sides of the tabs projecting into the openings to provide a snap-in connection. The sub-grooves above and between the sub-groove openings are completely open and unobstructed to permit the tabs to be pressed downwardly thereinto.

Abstract: A sootblower for an economizer of the type having a vertically extending cylindrical casing in which is mounted a plurality of spiral coils arranged parallel to each other in concentric relation with respect to the central vertical axis of the cylindrical casing. The spiral coils are in the form of finned tubes, the coils being disposed in closely spaced relation but providing clearance between the fins on adjacent coils. A heat exchange fluid is conducted through the spiral coils whereby the coils can extract heat from exhaust gases passing upwardly through the economizer from a boiler.

Abstract: In a method of treating flue gas which results from the burning of coal in a boiler wherein the flue gas is passed through a wet scrubber and proceeds in a saturated condition as a flue gas stream to an exhaust fan and then up a stack to the atmosphere, and wherein a reheat heat exchanger is employed to heat the saturated flue gas prior to its introduction to the exhaust fan to a sufficiently high temperature above its dew point the improvement in that method which comprises heating at least a portion of the flue gas stream subsequent to its passage through the wet scrubber and prior to its passage through the reheat heat exchanger to prevent any condensation from the flue gas stream in or on the reheat heat exchanger.

Abstract: An improved arrangement for preheating feedwater in a steam boiler system prior to the feedwater entering a fuel economizer in order to prevent corrosion due to condensation of flue gas in the fuel economizer and in the exhaust of the boiler system. The feedwater, prior to entering the fuel economizer, is heated in a preheater with a portion of steam from a boiler. The amount of steam entering the preheater is regulated by two temperature control valves. A first temperature control valve is regulated by the temperature of the feedwater prior to entering the fuel economizer. A second temperature control valve is regulated by the temperature of the flue gas in the boiler exhaust stack.

Abstract: The panel, as constructed of two plates or sheets marginally seam-welded together and subdivided internally into parallel longitudinal flow passages between vertically spaced inlet and outlet fittings, provides for a well distributed, low-volume flow of an appropriate heat transfer liquid therethrough, preferably from bottom to top thereof.In one illustrated embodiment, such equalized flow distribution is insured by restricted central throat or diverter formations lying between the respective fittings, hence the opposed inlet and outlet ends of said longitudinal flow passages. Moreover, the center-most of said flow passages is longer than those at either side thereof, which progressively decrease in length to the side-most thereof, so that said header spaces incline mildly downwardly in reference to the vertical. This contributes to improved drainage of the panel when desired; it also tends to make for an even distribution as to the vertical flow.