單項(xiàng)選擇題In a flash evaporator, scale as a result of higher than normal temperatures in most likely to occur in the （）

A.second stage feed heater
B.saltwater feed heater
C.distillate cooler
D.second stage vapor separator


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1.單項(xiàng)選擇題Small droplets of water entrained in the flashed vapor produced in a flash-type evaporator, are removed by the （）

A.spray pipes
B.demisters
C.condensers
D.splash baffles

2.單項(xiàng)選擇題The demisters installed in a flash-type evaporator serve to （）

A.deaerate the first effect distillate
B.filter the condensed flash vapors
C.deaerate the first and second effect distillate
D.remove small water droplets entrained in the flashed vapor

3.單項(xiàng)選擇題A vacuum is initially established in the first and second stages of a low pressure evaporator by the use of （）

A.vacuum drag from the auxiliary condensate system
B.individual vacuum pumps
C.a single non-condensing air ejector
D.a two stage air ejector

4.單項(xiàng)選擇題The heated feed-water entering any flash chamber of a flash-type evaporator will（）

A.vaporize, with the un-flashed water remaining at the temperature at which it entered the flash chamber
B.vaporize, with the un-flashed eater equalizing to the saturation conditions existing in the f lash chamber
C.vaporize, with the remaining water a t a temperature greater than it entered the flash chamber
D.boil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber

5.單項(xiàng)選擇題On a multistage flash-type evaporator, the flash chamber is （）

A.combined as part of the salt water feed heater
B.the open area above the brine levels in the first and second stages
C.combined as part of the distillate cooler
D.another term used to describe the vapor feed heater