Patent GB-1444235-A (GB)
Title: Plate heat exchangers
IPC: F28F3/08
Filed: 1973-11-27
Abstract: 1444235 Degassing liquids G N TKACH V D SMOLYAK V M FRUMIN and A G KLIMOV 27 Nov 1973 54919/73 Heading B1M [Also in Division F4] In a plate heat exchanger comprising a stack 33 or 34 of spaced-apart plates 1 wherein two sets of alternating passages (4, 8 respectively) for the heat exchanging media are defined by the inteplate spaces, and wherein one of the media is a liquid from which a gas is liberated during heat exchange, the plate stack is arranged in a housing 11 the interior of which is in communication with one set of the passages through which a steam-gas mixture flows in heat exchange with the liquid flowing in the other set of passages means being provided four conveying away the gas liberated from the liquid during heat exchange. The liquid for example may be the filter liquid used in soda ash production containing carbon dioxide and other components. As shown in Fig. 5 the indirect heat exchange between the fluids provided by the plate stacks 33, 34 may be combined in the same arrangement with direct contact heat exchange between said fluids in heat exchangers 35. In each plate pack there are provided by the plate interspaces, peripherally sealed passages 4 for the liquid being heated, and pasages 8 which are open to the space within the housing 11. The contact heat exchangers 35 contain packing elements comprises perforated plates 36. The liquid being heated flows from inlet 2 to outlet 3 of each plate pack, downwardly through the plate pack passages 4. From outlet 3 of pack 34 the liquid flows via perforated pipe 42 into one of the contact heat exchangers 35 and downwardly therein to an outlet connected to the inlet 2 of plate pack 33. The heating medium (steam-gas mixture) flows downwardly through a supply duct 37 and some of this medium enters the heat exchanger 35 via ducts 38 and from there, any residual gaseous components of said heating medium together with gas liberated from the liquid during heat exchange in heat exchangers 35, are discharged via a connection 40 to an upright duct 39. Heating medium is also conveyed (by means not shown) from the supply duct 37 to the housing 11 where it passes upwardly through the interplate spaces 8 of the heat exchanger 33, 34. Any condensate from the medium runs away down the wall of the housing. Gas liberated from the liquid during heating passes out of the plate pack 33 or 34 via a connection 32 and ducting 41 into the duct 39. The heat exchange plates in the plate packs 33 or 34 each have a peripheral sealing gasket 5 of rubber, and guide ribs such as 13 for conveying the liquid flow through the interplate spaces from inlet 9 to outlet 10. The guide ribs are also arranged to convey liberated gas to a gas offtake port 18. All the ports 18 of the individual plates in a pack are connected via interplate spacing sleeves 14 with the connection 32. The guide ribs may be stamped in the plate material or they may comprise separate elements of metal or of a resilient non-metalic material. Alternative plate forms are described (Figs. 3, 4). In each plate pack the plates are clamped by 'bolts 6 between end plates such as 7.