초록 ▼

A paired stage flash evaporator unit is provided with an elongated shell having respective higher temperature and lower temperature evaporation chambers extending along a bottom portion of the shell space and separated from each other by an interstage elongated partition wall. A condenser tube bundl

A paired stage flash evaporator unit is provided with an elongated shell having respective higher temperature and lower temperature evaporation chambers extending along a bottom portion of the shell space and separated from each other by an interstage elongated partition wall. A condenser tube bundle extends longitudinally between opposite shell end walls in an upper portion of the shell space. A transverse interstage partition separates the tube bundle into separate condenser chambers. Each condenser chamber is paired with an evaporation chamber by means of shroud and other isolation structure thereby forming two paired stages in the unit. In each stage, a liquid separator mesh extends coextensively with the evaporation chamber and both condenser chambers to direct vapor from the evaporation chamber into a flow path above the mesh. Vapor which is generated at points longitudinally displaced from the associated condenser chamber can thus flow longitudinally along the flow path above the mesh to an area where it is directed into the associated condenser chamber. The shell has a roof member which is sloped over the space above each mesh so that the longitudinal flow path increases in cross section toward the receiving condenser chamber.

대표청구항 ▼

A multistage flash evaporator unit for a multistage flash evaporation plant wherein successive evaporation stages are operated at successively decreasing pressures to evaporate a solvent from a solution, said evaporator unit comprising: a generally elongated enclosure having opposed end walls and el

A multistage flash evaporator unit for a multistage flash evaporation plant wherein successive evaporation stages are operated at successively decreasing pressures to evaporate a solvent from a solution, said evaporator unit comprising: a generally elongated enclosure having opposed end walls and elongated side and top and bottom walls extending therebetween; said enclosure having a lower portion where the solvent is evaporated and an upper portion where the distillate is condensed; means for dividing said upper enclosure portion into a pair of separate condenser chambers staged in the longitudinal direction; condenser means including an array of elongated heat exchanger tubes extending between said end walls to provide tube coolant flow in the longitudinal direction, said tubes extending through apertures in said dividing means; means for collecting distillate for outflow from the condenser chambers; means for partitioning said enclosure lower portion to define a pair of separate longitudinally extending evaporation chambers through which the solution is successively directed in the cross-enclosure direction; means for separating said condenser chambers from said evaporation chambers and for directing flow of evaporated solvent from one of said evaporation chambers to one of said condenser chambers in one higher temperature evaporation stage and from the other evaporation chamber to the other condenser chamber in the next lower temperature evaporation stage; means for supporting liquid separating means in the vaporized solvent path above each evaporation chamber; each of said liquid separating means being substantially coextensive with its associated evaporation chamber and both of said condenser chambers to direct the solvent into space thereabove in said upper enclosure portion where a major portion thereof flows generally directly in the transverse direction into the associated condenser chamber and the rest first flows generally in the longitudinal direction and then generally transversely into the associated condenser chamber; and means for directing vapor in a path through said condenser tubes and for venting noncondensables from each condenser stage to a lower pressure location.