Plate heat exchanger

Abstract

A stack of heat transfer plates configured to be arranged within a block-type heat exchanger. The stack of heat transfer plates comprises pairs of heat transfer plates that are stacked such that a flow path for a first fluid is formed between the stacked pairs of heat transfer plates, wherein a pair of the stacked pairs of heat transfer plates comprises a first heat transfer plate and a second heat transfer plate that are joined such that a flow path for a second fluid is formed between the first and second heat transfer plates. The pair of heat transfer plates comprises corrugations that are arranged on a respective side of an elongated joint that joins the first and second heat transfer plates. A related plate heat exchanger is also disclosed.

1 . A stack of heat transfer plates configured to be arranged within an enclosure formed by a top head, a bottom head and four side panels that are bolted together with a set of corner girders, the stack of heat transfer plates comprising pairs of heat transfer plates that are stacked such that a flow path for a first fluid is formed between the stacked pairs of heat transfer plates, wherein a pair of the stacked pairs of heat transfer plates comprises a first heat transfer plate and a second heat transfer plate that are joined such that a flow path for a second fluid is formed between the first and second heat transfer plates ( 51 ,  52 ), wherein
 the first heat transfer plate and the second heat transfer plate are joined by a plurality of elongated joints, such that the flow path for the second fluid comprises multiple parallel flow channels, and wherein   the pair of first and second heat transfer plates comprises corrugations that are arranged on a respective side of said plurality of elongated joints.   
     
     
         2 . A stack of heat transfer plates according to  claim 1 , wherein the first heat transfer plate comprises elongated joint grooves along which the elongated joints are arranged. 
     
     
         3 . A stack of heat transfer plates according to  claim 2 , wherein the joint grooves extend unbroken along the flow path formed between the first and second heat transfer plates. 
     
     
         4 . A stack of heat transfer plates according to  claim 2 , wherein the second heat transfer plate comprises an elongated joint groove along which the elongated joint is arranged, and wherein the joint grooves of the first and second heat transfer plates abut each other such that the heat transfer plates are joined at the joint grooves. 
     
     
         5 . A stack of heat transfer plates according to  claim 1 , wherein the joints comprise two at least partially overlapping joint sections. 
     
     
         6 . A stack of heat transfer plates according to  claim 1 , wherein the corrugations are symmetrical. 
     
     
         7 . A stack of heat transfer plates according to  claim 1 , wherein the pair of heat transfer plates comprises a first set of opposite, elongated side joints that join the first and second heat transfer plates. 
     
     
         8 . A stack of heat transfer plates according to  claim 7 , wherein the pair of heat transfer plates comprises a second set of opposite, elongated side joints that are transverse the first set of elongated side joints and joins the pair of heat transfer plates with a similar pair of heat transfer plates, such that the flow path for the first fluid comprises a free-flow path between the second set of side joints. 
     
     
         9 . A stack of heat transfer plates according to  claim 8 , wherein the free-flow path between the second set of side joints is interrupted by at least one support for reducing bulging of heat transfer plates. 
     
     
         10 . A stack of heat transfer plates according to  claim 1 , wherein each of the first heat transfer plate and the second heat transfer plate comprises corrugations that are arranged on a respective side of the elongated joint. 
     
     
         11 . A stack of heat transfer plates according to  claim 6 , wherein the corrugations comprises sets of corrugations that are arranged between the plurality of elongated joints that join the first and second heat transfer plates. 
     
     
         12 . A stack of heat transfer plates according to  claim 1 , wherein the corrugations comprise ridges and grooves that extend in a direction that is 45°-90° transverse a direction along which the elongated joint extends. 
     
     
         13 . A stack of heat transfer plates according to  claim 1 , wherein the first heat transfer plate and the second heat transfer plate have similar shapes and the second heat transfer plate is, in relation to the first heat transfer plate, turned 180° around an axis that is parallel to the plane of the second heat transfer plate. 
     
     
         14 . A stack of heat transfer plates according to  claim 1 , wherein the pair of heat transfer plates has a rectangular shape and comprises four corners that are welded to linings configured to at least partially surround the set of corner girders. 
     
     
         15 . A plate heat exchanger comprising a stack of heat transfer plates according to  claim 1 , further comprising a top head, a bottom head and four side panels that are bolted together with a set of corner girders to form an enclosure in which the stack of heat transfer plates is arranged.