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AssigneeD.V.T. Buro fur Anwendung Deutscher Verfahrenstechnik H. Morsy
InventorGamal E. D. Nasser
Estimating the term…
In the distillation of fresh water from sea water, the sea water is passed ownwardly in a falling film evaporator through a multiplicity of vertical tube evaporator (VTE) stages and multiple stage flash (MSF) evaporators. After the sea water passes through the first VTE stage where it forms a liquid component and a steam component, the liquid component is distributed evenly into the next VTE stage while the steam component enters an adjoining MSF stage. Condensed fresh water flows downwardly from one MSF stage to the next and experiences flash evaporation. The sea water or brine component and the fresh water distillate flow downwardly through the VTE and MSF stages so that the brine component can be removed from the final VTE stage and the fresh water distillate from the final MSF stage. The steam used to evaporate the sea water flows initially through the first VTE stage and then in combination with the steam component of the sea water through the next MSF stage and then continues alternately through the remaining VTE and MSF stages. Inert gases produced during the stagewise evaporation are removed periodically by suction. In the lower or low pressure VTE stages, for each VTE stage the condensed fresh water distillate is flashed in a plurality of MSF stages. The sea water is preheated before it is introduced into the first VTE stage and the primary steam used for heating the sea water and the steam component of the sea water are passed through the preheater for heating the sea water. The preheater and the VTE stages of the falling film evaporator are formed of stamped heat exchanger parts.
Apparatus for the distillation of fresh water from seat water comprising a generally vertically extending falling film evaporator comprising a vertical tube evaporator formed of a multiplicity of vertical tube evaporator stages with said evaporator stages spaced apart in the vertical direction and including an uppermost stage, a lowermost stage and a multiplicity of vertically spaced stages therebetween, means for supplying preheated seat water to the uppermost stage of said vertical tube evaporator so that the seat water flows downwardly through said stages, each of said vertical tube evaporator stages of said vertical tube evaporator comprises upwardly extending stamped heat exchanger plates having opposite vertically extending planes with shaped reinforcing projections stamped out of the opposite planes of said plates with the projections forming shaped recesses on the opposite sides of said plates from said reinforcing projections, said projections and recesses arranged in a grid-like manner in both directions of said plates, a first pair of said plates arranged with said projections aligned in opposed relation with said projections extending in the opposite direction combining to form tubes extending in the vertical direction of said plates, the recesses in said plates aligned vertically with said projections forming said tubes defining cross connections between said tubes for providing a pressure balancing effect, another said plate on each side of said first pair with said projections of the another said plate offset transversely of the vertical direction relative to said projections in said first pair and the another said plate and the adjacent one of said plates of said first pair defining therebetween slot-like ducts extending transversely of said tubes, in said vertical tube evaporator said tubes are arranged for the downward flow therethrough of the preheated seat water and said slot-like ducts are arranged for the flow therethrough of a steam component for vaporizing the sea water flowing through said vertical tubes so that the flow through said vertical tubes is generally horizontal, and the upper ends of said plates forming said tubes are spaced apart forming an inlet to each of said vertical tube evaporator stages, a loosely arranged horizontally extending distributor tube located in each said inlet extending for the horizontal length of said inlet across the upper ends of said plates and said rod forming a weir-like member for uniformly distributing the downwardly flowing seat water into said tubular ducts in each said vertical tube evaporator stage.
Apparatus for the distillation of fresh water from sea water comprising a generally vertically extending preheated divided into a number of vertically spaced preheater stages including an uppermost stage, a lowermost stage and a plurality of vertically spaced stages therebetween, each of said preheater stages comprises continuous upwardly extending stamped heat exchanger plates having opposite vertically extending planes with shaped reinforcing projections stamped out of the opposite planes of said plates and said projections forming shaped recesses on the opposite sides of said plates from said reinforcing projections, said projections and recesses arranged in a grid-like manner in both directions of said plates. a first pair of said plates arranged with said projections aligned in opposed relation with said projections extending in the opposite direction combining to form tubes extending in the horizontal direction of said plates, another aid plate on each side of said first pair with said projections of the another said plate offset relative to said projections in said first pair and the another said plate and the adjacent one of said plates of said first pair defining therebetween slot-like ducts extending transversely of said tubes in the vertical direction, said slot-like ducts are arranged to receive sea water for the upward flow therethrough of the sea water from the lowermost stage to the uppermost stage, and said heat exchanger plates forming said preheater having horizontally extending unstamped areas spaced apart in the vertical direction and dividing said preheater into individual stages, and said unstamped areas effecting a balance of the pressure of the sea water flowing upwardly through the slot-like ducts, and the location of the unstamped areaa defining the space between adjacent stages of said preheater and the number of said unstamped areas defining the number of the stages of said preheater.
Dependencies are inferred from the claim text.