Water evaporates or steam condenses at the saturation temperature, which depends upon the pressure, the higher the pressure () the saturation temperature.
A、A.the more
B、B.the higher
C、C.the lower
D、D.the highest
A、A.the more
B、B.the higher
C、C.the lower
D、D.the highest
A、to cut down the amount of cooling water needed B、to prevent an excess amount of cooling water from being discharged to the bilges C、to supply hot water to the evaporator for more economical operation D、None of the above is tree
A、by cooling sea water B、by heating sea water C、by evaporation of sea water D、by purifying sea water
A、A.less internal corrosion because of lower brine density B、B.higher temperature evaporation for lower salinity of the distillate produced C、C.less scale formation in a flash evaporator D、D.less feed-water required for a flash evaporator
A、Water is heated into vapor on heating surfaces B、Water is vaporized by pressure difference C、There are no heating-transfer surfaces D、There are more heating-transfer surfaces
A、Distillation is the process of boiling seawater to produce vapor which is condensed into fresh water B、Evaporation is the second part of the distillation process where brine is removed C、Brine is the result of condensed sea water vapor D、Distillate is the product resulting from the evaporation of fresh water vapor
A、A.Control of evaporation B、B.A separate means to prevent feed-water contamination C、C.Power circulating pump D、D.Super-heater
A、a separate air ejector unit B、a direct unimpeded connection between second stage and salt water feed heater C、either by vacuum drag or an external line from the first stage via a fixed orifice D、the fixed orifice provided in the steam supply line