Abstract: A plate heat exchanger includes a package of heat transfer plates. The heat transfer plates are provided with inlet ports therethrough forming an inlet channel through the package. A sealing means is arranged between the heat transfer plates and forms, together with the heat transfer plates, a first flow passage for one fluid in every second plate interspace and a second flow passage for a heating fluid in each of the remaining plate interspaces. The inlet channel communicates with each first flow passage through at least one inlet passage while being blocked from communication with each second flow passage by part of the sealing means located in a first sealing area that extends around the inlet channel. Every two adjacent heat transfer plates which delimit the first flow passage have an essentially tight surface abutment against each other in a second sealing area. The inlet passage is delimited by at least one of the two adjacent heat transfer plates between its inlet port and the first sealing area.

Abstract: In a welded plate heat exchanger the edge portion of each heat transferring plate (2) is welded together with the edge portions of a first adjacent heat transferring plate (3) along an outer line (10B) and with the edge portion of a second adjacent heat transferring plate (1) along an inner line (11B). In order to ensure, in connection with welding together of the heat transferring plates from only one direction, that contact is maintained between the plates along said outer line (10B) each heat transferring plate is formed with a stiffening crease (18) outside said outer line. The stiffening crease (18) extends along the edge of plate outside said outer line (10B).

Abstract: A plate heat exchanger for evaporation of a liquid includes a number of thin heat transfer plates (4), provided with corrugation pattern in the form of ridges and grooves, which in each second plate interspace for supply of said liquid have several inlet openings (18) distributed horizontally across the width of the heat transfer plates. The heat transfer plates each have a horizontal portion (28) having less pressing depth that the rest of the corrugation pattern, which is formed such than the heat transfer plates (4) in the area of the portions (28) referred to, abut against each other in the plate interspaces for said liquid and are separated from each other in the plate interspaces for a heating fluid.

Abstract: A permanently united plate heat exchanger normally comprises a plate package (1) having two end plates (3, 4) and several heat transferring plates (5) which are arranged therebetween. The end plates (3, 4) and the heat transferring plates (5) are permanently united, for instance by brazing, to a plate package the end plates of which have altogether four openings to form inlets and outlets for two heat exchange fluids. Two or more plate packages (1, 2) may be coupled together to form a plate heat exchanger. Preferably, plate packages of this kind are produced which have different numbers of heat transferring plates (5, 8).

Abstract: The invention is a method for assembling heat transfer plates, introducing a plastic protective material into the plate interspaces as a vapor, and condensing the material on the surfaces of the heat transfer plates.

Abstract: In a plate heat exchanger each one of a stack of plate elements consists of two heat transfer plates which define between themselves a flow space for a heat exchange fluid and which are permanently joined together, for instance by brazing, around their edges and at several places distributed over the heat transfer portions of the plates. Each heat transfer plate has protuberances and depressions formed by pressing in its heat transfer portion and has port portions with at least four through flow openings. Adjacent plate elements are permanently joined together, for instance by brazing, only around each of the through flow openings. The stack of plate elements is held together by members extending through said through flow openings.

Abstract: A plate heat exchanger is composed of a number of plate elements each of which comprises two thin nested plates, the elements defining flow spaces between them, adjacent elements being joined around their periphery by brazing bent edge portions, there being brims extending from the edge portions of each plate element, each brim being spaced from the brims of adjacent plate elements.

Abstract: In a plate heat exchanger for climbing film evaporating of a fluid, vertically arranged heat transfer plates (1, 2) delimit evaporating passages (4) and condensating passages (7) between themselves. Each evaporating passage (4) has a fluid inlet (5) at its lower portion and an outlet (6) for concentrated fluid and generated vapor at its upper portion, which outlet (6) is located at one vertical side of the heat transfer plates. To provide a desired distribution of the fluid and the vapor in each of the evaporating passages (4), at least alternate heat transfer plate (1), in its lower portion (17A) closest to the inlet (5) for fluid, has been provided with a number of zones (23A-26A), having different pressing pattern of corrugation ridges and grooves.

Abstract: The present invention relates to a plate heat exchanger with a number of heat transfer plate (1) arranged between two end plates (3,4). Two guiding bars, which extend from one end plate (3) to the other end plate, are formed in one piece of one and the same rod (5).

Abstract: In a plate heat exchanger a stack of double-wall elements (23-26) is included, which between themselves form flow passages (32-34), and each one of which comprises two heat exchange plates, each having a heat exchange portion and a sealing portion surrounding the same and via said portions abutting directly against corresponding portions of the other heat exchange plate. Sealing members (28-31) abut sealingly against adjacent double-wall elements (23-26) along the sealing portions and delimit the flow passages (32-34). Joining means press the double-wall elements against each other. To enable a quick indication of a possible leakage through a heat exchange plate at least one channel (40, 41) is arranged between the plates in each double-wall element. The channel (40, 41) is designed between opposite parts of sealing portions of the respective heat exchange plates and extends across the latter.

Abstract: The present invention relates to a plate heat exchanger for the evaporation of a fluid which is comprised of a plurality of heat transfer plate pairs. Each plate of the pair has a ridged and grooved corrugation pattern. Between adjacent plates are flow spaces, each having an inlet and an outlet. The ridges of each plate of each pair abut the ridges of the other plate in the pair to form a plurality of supporting points. The flow spaces between alternate plates form passages for the fluid, and the remaining flow spaces form passages for a heating fluid.The importance of the invention is that at least alternate heat transfer plates have a plurality of zones with different corrugation patterns arranged sequentially in the direction of fluid flow in the passages. The ridges and grooves of each plate in the pair are arranged to provide a flow resistance which gradually decreases in the direction of fluid and generated vapor flow.

Abstract: The present invention relates to a plate heat exchanger comprising several heat exchange plates arranged in a frame between a frame plate and a pressure plate, and suspended from a horizontal carrying bar, which has a hollow supporting body with protruding suspension means on its underside for the heat exchange plates. According to the invention the supporting body and the suspension means are formed of a bent sheet material, and the carrying bar has opposite side walls (3, 15, 16) which extend to abutment against each other and are joined to each other at least at lower support surfaces (6) located close to a vertical center plane through the carrying bar, and which beneath said support surfaces (6) extend away from said central plane to form said suspension means.

Abstract: This invention relates to a lining for lining inlet ports and outlet ports in a frame plate or a pressure plate for plate heat exchangers and comprising a cylindrical portion and two flanges which are connected to the cylindrical portion and which during the use of the lining are positioned on each side of the frame plate or pressure plate. According to the invention the lining comprises a rigid part having a cylindrical portion (6; 9; 13B; 16) and a flange (3; 8; 13A; 19) being an integral part of the cylindrical portion, and that the remaining part of the lining is made of an elastic material.

Abstract: The present invention refers to a plate heat exchanger comprising a package of heat exchange plates (2), each having a peripheral portion (17) and with this a heat exchanger portion (9) and several port portions with through-flow ports forming inlet and outlet channels through the package. Said heat exchange plates (2) are permanently joined to each other along their peripheral portions (17) and at a variety of places in their heat exchange portions (9) in such manner that they leave flow passages between adjacent heat exchange plates (2), and between an outer line (13) and an inner line (14) located closer to the inlet and outlet channel, respectively.

Abstract: In a series of heat exchange plates (5, 6), each being rectangular with ports (7, 8, 9, 10) in its corner portions, alternate plates (6) are fully sealed and coact with intermediate plates (5) to define two groups of elongated passages through which the respective heat exchanging fluids (A, B) flow. Each intermediate plate (5) is only partially sealed and defines with one of the two adjacent fully-sealed plates (6) an area communicating directly with the atmosphere, the partial sealing consisting of port sealing means (7a, 8a, 9a, 10a) interconnecting respective pairs of opposing ports to form channels through which the two fluids (A, B) flow without entering said area. The areas form paths through which any leakage of either fluid (A, B) can escape to the atmosphere, thus preventing contamination of either fluid by the other.

Abstract: In a plate heat exchanger for evaporation of a liquid conventional heat exchange plates (3) are used which have an elongated and substantially rectangular form and which have corner portions provided with ports. One corner portion of at least every second heat exchange plate has been removed, and outlet openings (16) from the plate interspaces, in which liquid is to be evaporated, has been created by omitting edge gaskets between the heat exchange plates forming these interspaces in the areas of the removed corner portions.

Abstract: In a plate heat exchanger, the heat exchange plates of which have been provided by pressing with a corrugation pattern comprising ridges (19a, 19b) and valleys (20a, 20b), the ridges and valleys of adjacent plates extend in parallel. In each plate interspace the ridges of adjacent plates abut against each other such that the opposing valleys form parallel flow passages in the plate interspace. The ridges of at least some of the heat exchanger plates are provided with depressions (21a, 21b), which form thresholds in the valleys formed on the opposite sides of the plates by the ridges. Thresholds of this kind are formed in the heat exchange plates such that they create a substantially larger flow resistance in the plate interspace for one the heat exchange medium than in the plate interspaces for the other heat exchange medium.

Abstract: A plate heat exchanger especially adapted for viscous fluids or fluids containing fibers has spacing means extending above the normal corrugations thus widening the normal interplate channels and the inlets and outlets to and from said channels are formed by juxtaposing the plates containing ports forming said inlets and outlets to give the maximum throughflow.

Abstract: The present invention relates to a method for recovering heat and separating substances from a flue gas streaming through a heat exchange apparatus comprising a casing with heat exchange elements inserted thereinto, a medium being provided for absorbing heat from the flue gas. According to the invention the medium that shall absorb heat from the flue gas is conducted through the heat exchange elements, the heat exchange elements and the connections to the casing for flue gas being so placed that the flue gas streams perpendicularly to the heat exchange elements, the flue gas being given a flow velocity cross the heat exchange elements of not more than 3 m/sec. Soot in the flue gas is collected on the heat exchange elements and adsorbs and/or dissolves gaseous substances such as sulphur dioxide. The invention also relates to an apparatus for carrying out the method.

Abstract: A plate heat exchanger has a frame plate, a pressure plate and heat exchange plates clamped therebetween, all suspended from a carrying bar passing through a hole in the pressure plate and extending at least some distance into a corresponding hole in the frame plate. The pressure plate is slidable on the carrying bar. The frame plate and the pressure plate are identical so that the hole for the carrying bar in the frame plate is identical to the hole for the carrying bar in the pressure plate. The carrying bar is fastened in the frame plate by means of a locking device.