单选题In a flash type evaporator, the brine overboard pump is vented directly to the()Asaltwater heater shellBthe condensation of the saltwater feedCair ejectors, eductors, or a separate vacuum pumpDcondensation of the distillate

单选题
In a flash type evaporator, the brine overboard pump is vented directly to the()
A

saltwater heater shell

B

the condensation of the saltwater feed

C

air ejectors, eductors, or a separate vacuum pump

D

condensation of the distillate


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In a flash type evaporator, all saltwater heaters are vented through individual vent cocks to the ______.A.saltwater heater shellB.second-stage condenserC.atmosphereD.second-stage flash chamber

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All of the following steps are taken in starting a centrifugal pump,EXCEPT to ______.A.Set the relief valveB.Check the lubrication systemC.Vent the pump casingD.Open the pump suction and discharge valves

单选题When a flash-type evaporator is to be secured for an extended period of time, the entire unit should be drained, cleaned, and ().Acompletely filled with saltwaterBfilled with de-scaling compoundCtightly closed to exclude airDvented to the atmosphere

单选题Excessive scale formation in a distilling plant may result from ().Apoor distillate qualityBreduced evaporator capacityClow brine concentrationDimproper vacuum regulation

单选题A flash-type evaporator discharges heated seawater into a chamber that is maintained at a pressure than the vapor pressure of the entering heated seawater, and subsequently the flashed water vapor thereby produced()Alower condensingBhigher coolingClower coolingDhigher condensing

单选题The heated feed-water entering any flash chamber of a flash-type evaporator will()Avaporize, with the un-flashed water remaining at the temperature at which it entered the flash chamberBvaporize, with the un-flashed eater equalizing to the saturation conditions existing in the f lash chamberCvaporize, with the remaining water a t a temperature greater than it entered the flash chamberDboil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber

单选题In a flash type evaporator, all saltwater headers are vented through individual vent cocks to the().Asaltwater heater shellBsecond-stage condenserCatmosphereDsecond-stage flash chamber

单选题Which of the listed problems could produce a high absolute pressure within a flash type evaporator?()AProduction of high salinity distillateBSeawater feed temperature below 165℃CA leak in the first stage demisterDA cracked distillate pump vent line

单选题For a flash type evaporator, the seawater heater will have to maintain a enough temperature to minimize scale formation()AlowerBhigherClowDhigh

单选题Small droplets of water entrained in the flashed vapor produced in a flash-type evaporator, are removed by the ()Aspray pipesBdemistersCcondensersDsplash baffles

单选题In the operation of a flash type evaporator equipped with air ejectors,the air and non- condensable gases are evacuated directly from the ().Afirst stage flash chamberBsecond stage flash chamberCfirst stage after condenserDsecond stage distilling condenser

单选题The demisters installed in a flash-type evaporator serve to ()Adeaerate the first effect distillateBfilter the condensed flash vaporsCdeaerate the first and second effect distillateDremove small water droplets entrained in the flashed vapor

单选题The efficiency of a flash type evaporator can be increased by()Alowering brine discharge densityBdecreasing the absolute pressure of each stageCincreasing the saltwater feed heater temperatureDincreasing the pressure at the spray pipe

单选题One distinct advantage of flash type evaporators, as compared to most other evaporators, is that in a flash evaporator ().Ahigh temperature distillate can be re- circulated to induce additional flashingBscale formation is not a severe problemCcold shocking is more effective in removing scaleDwater purity is greatly increased at high capacity

单选题Which of the following statements is true concerning any evaporator?()AHigh conductivity of the distillate indicates distillate salinity is excessiveBIncreasing the absolute pressure of the shell will increase the distillers capacityCMesh separators are used in evaporators to filter the distillateDReducing the brine density will reduce the heat lost overboard

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单选题The heated feedwater entering any flash chamber of a flash-type evaporator will()Avaporize, with the unflashed water remaining at the temperature at which it entered the flash chamberBvaporize, with the unflashed water equalizing to the saturation conditions existing in the flash chamberCvaporize, with the remaining water at the temperature greater than it entered the flash chamberDboil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber

单选题For a flash type evaporator, a demister is located the condenser()AAfterBbeforeCinsideDoutside

单选题The advantages of flash type evaporators, as compared to submerged tube type evaporators, include ().Aless internal corrosion because of lower brine densityBhigher temperature evaporation for lower salinity of the distillate producedCless scale formation in a flash evaporatorDless feed-water required for a flash evaporator

单选题On a multistage flash-type evaporator, the flash chamber is ()Acombined as part of the salt water feed heaterBthe open area above the brine levels in the first and second stagesCcombined as part of the distillate coolerDanother term used to describe the vapor feed heater

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单选题Under normal operating conditions, the highest temperature and pressure conditions existing in a flash-type evaporator will occur in the ().Afirst stageBsecond stageCdistillate coolerDsalt water feed heater