Device for processing water having high concentrations of scale forming compounds and high solids content in a high efficiency vapor compression distillation system

A device for processing water having high concentrations of scale forming compounds and high solids content in a high efficiency vapor compression distillation system comprising a boiler drum, a boiling solution contained in said boiler drum, a plate-in-frame heat exchanger mounted in said drum, said plate-in-frame heat exchanger being submerged in said boiling solution, said plate-in-frame heat exchanger having a plurality of alternating boiling chambers and condensing chambers, said boiling chambers being in free communication with the boiling solution in said drum, said condensing chambers being sealed from the boiling solution in said drum, a liquid feed material inlet connected to said drum, a steam outlet mounted on said drum, a steam inlet mounted on said drum communicating with the condensing chambers, means for flowing steam from said drum steam outlet to said steam inlet, a condensate outlet mounted on said drum communicating with the condensing chambers, a concentrate outlet mounted on said drum communicating with said boiling chambers, and an impeller mounted in said drum for circulating the boiling solution through the boiling chambers between adjacent condensing chambers, whereby suspended solids are prevented from accumulating out of the boiling solution and the formation of scale on exterior surfaces of the condensing chambers is inhibited.