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
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()
A

lower condensing

B

higher cooling

C

lower cooling

D

higher condensing


参考解析

解析: 暂无解析

相关考题:

dielectric heated drying

For the fuel oil purifier higher throughput and more efficient process can be achieved if the fuel is0 A.viscosity a heated to reduce itsB.cooled to reduce its temperatureC.heated to reduce its densityD.heated to reduce its gravity

A thermostatic expansion valve is properly controlling evaporator superheat. Adjusting this valve to lower the superheat will result in a/anA.evaporator pressure decreaseB.evaporator coil over-feedC.evaporator capacity increaseD.expansion valve diaphragm rupture

Which of the listed problems could produce a high absolute pressure within a flash type evaporator?A.production of high salinity distillateB.seawater feed temperature below 165℃C.a leak in the first stage demisterD.a cracked distillate pump vent line

The unlashing work must be finished before ().A、dischargedB、being dischargedC、dischargingD、discharges

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The flash-evaporator is different with the submerged-tube evaporator in that for the former()AWater is heated into vapor on heating surfacesBWater is vaporized by pressure differenceCThere are no heating-transfer surfacesDThere are more heating-transfer surfaces

单选题The vacuum maintained in the salt water feed heater shell of a flash-type evaporator is generally accomplished by ().Aa separate air ejector unitBa direct unimpeded connection between second stage and salt water feed heaterCeither by vacuum drag or an external line from the first stage via a fixed orificeDthe fixed orifice provided in the steam supply line

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

单选题What is the operating principal of a flash type evaporator?()ASea water is heated to boiling temperature under a vacuumBSea water is passed over heated plates in a thin filmCHeated sea water is injected into a vacuum chamberDSea water is forced through a heated eductor

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 () pump discharges a nearly constant amount of liquid regardless of pressure.Amixed-flowBaxial-flowCcentrifugalDdisplacement

单选题The bulb for the thermal expansion valve is located()Ain the middle of evaporator coilsBnear the evaporator coil outletCnear the evaporator coil inletDon the bottom row of evaporator coils

单选题Less scale formation occurs in a flash evaporator than in a submerged tube evaporator because ().Athe distillate produced has greater purityBno boiling occurs on heat transfer surfacesCevaporation occurs at a higher rateDthe incoming feed is at a higher temperature

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

单选题Why will a two stage flash type distilling plant tend to operate more efficiently when operating in cold seawater?()AThe colder seawater passing through the condenser tube bundles of the various stages increases evaporator vacuumBThe amount of heated feed water discharged from the feed water heater after cndenser is increasedCFewer non-condensable gases are created by the flow of colder seawaterDMore seawater is allowed to pass through the flint stage overflow weir

单选题With a vacuum boiling evaporator, the remainder of sea water fed to the evaporator is pumped out by ().Aa brine pumpBan air ejectorCa feed pumpDdistillate pump

单选题Which of the following descriptions best identifies the operating principal of a flash-type evaporator?()ASea water is heated to boiling temperature while under a vacuumBSea water is passed over heated plates in a thin filmCHeated sea water is injected into a vacuum chamberDSea water is forced through a heated eductor

单选题On which of the following heated surfaces of a flash type evaporator would you be more likely to find soft scale formation?()AFeed-water heater internal tube surfacesBInternal distillate cooler tubesCFlash chamber vertical surfacesDDistilling condenser tubes

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

单选题In practice, the refrigerant flow after the evaporator is designed to ensure that the vapor leaving the evaporator is slightly ().AsaturatedBsuper-cooledCwetDsuperheated

单选题In a flash distilling unit, evaporator feed (seawater) first absorbs heat in the ().Avapor feed heaterBair ejector condenserCsaltwater heaterDdistillate cooler

单选题The thermal expansion valve responds to the()Aamount of superheat in the vapor leaving the coilBamount of superheat in the liquidCtemperature in the evaporator coilsDpressure in the evaporator coils

单选题Which of the following is true according to the speaker?AThe atmosphere is marked with turbulences.BThe deep waters are full of turbulent currents.CThe atmosphere is heated from above.DThe deep waters are heated from below.