采用间壁式冷凝器和水环真空泵带热泵、蛇管冷凝器、水环真空泵冷凝器兼作物料预热器充分利用末效二次蒸汽的热量，并减少冷却水量的耗量。这种结构形式的多效降膜蒸发器的末效二次蒸汽冷凝为同温度的水（只产生相变），然后从冷凝器排出。冷凝水具有很高的温度，而且又是软水，可以很好地利用。水环真空泵将蒸发器的不凝性气体及少量蒸汽抽吸后排到大气中。并维护各效蒸发都具有一定的真空度。与采用水力喷射器相比，冷却水耗量、电耗量都较低。以富裕光明乳业集团两台型号RNJM02-2400型双效降膜蒸发器为例，其蒸发能力为2400kg/h，配套用水环真空泵电机功率5.5kw，冷却水耗量9t/h，进水温度l0℃，排水温度38℃，与同能力水力喷射器双效降膜蒸发器比较，功率降低13.5kw，每小时节约冷却水13吨。按给水价格1.00元/吨，排水价格0.80元/吨计算，电费和水量一年可降低操作费用143391元，3年可收回全部设备投资。
采用列管式冷凝器和水环真空泵结构采用混合冷凝器、凉水塔、水环真空泵带热泵、物料预热器、混合冷凝器、凉水塔和水环真空泵的三效降膜蒸发器，由冷却水循环泵将冷却水送至水塔后，冷却水的温度降低8℃，在多数蒸发器的计算中一般取6℃。冷却水循环泵的压力要求不高，只要将冷却循环水送至凉水塔即可，工作过程中只需冷却水通过凉水塔循环使用，几乎不用补加低温冷水，节水效果特别显著，特别是在缺水地区意义更大。
多效蒸发器配套泵的选择现采用单端面机械密封泵，我曾经选用过江苏靖江泵阀厂的氟塑料合金泵，成功地运用于吉林松原食品工业公司制药厂维生素C的生产，当时的主要目的是为了解决维生素C对泵的耐腐蚀性能这一特殊要求，后来成功地运用于RNJM03-5000型三效降膜蒸发器，并在龙丹集团和海拉尔光明乳业公司应用，效果一直很好。但这种氟塑料合金泵只是将机械密封处的供水去掉了，而配套电机功率与以往所选泵变化不大。后来选用无锡九扬泵业公司ICB系列单端面机械密封不锈板冲压泵，同样用在RNJM02-2400型双效降膜蒸发器上，进料泵型号ICB50-25-200型，流量6.3m3/h，扬程32m，电机功率2.2kw，其余两台物料泵和一台冷凝均选用ICB32-25-125型泵，流量3.2t/h，扬程20m，电机功率0.55kw，使RN-JM02-2400型双效降膜蒸发器的机组总功率仅配套这一项降低功率6.75kw，每年按300天，每天按16小时（两班工作制）计算，每年节约电费32400元。选用天锡九扬ICB系列泵，在哈尔滨油脂厂使用效果很好。
The use of partitions condenser and water ring vacuum pump with heat pump, condenser pipe snake, water ring vacuum pump condenser preheater material doubles as a full use of steam at the end of the second heat efficiency and reduce the consumption of cooling water. This structure forms of multi-effect falling film evaporator at the end of the second steam condensation effect for the same temperature of water (only have a phase transition), and then discharged from the condenser. Condensed water has a high temperature, but it is soft water, you can make good use of. Water ring vacuum pump to the evaporator of the non-condensable gas and a small amount of vapor pumped back into the atmosphere. And maintain the effect evaporation has a certain vacuum. With the use of hydraulic jet as compared to the cooling water consumption, electricity consumption is low. Bright Dairy Group, in two models of the rich RNJM02-2400 type double-effect falling film evaporator as an example, the evaporation capacity of 2400kg / h, matching the water ring vacuum pump motor power 5.5kw, cooling water consumption 9t / h, water temperature l0 ℃, water temperature 38 ℃, and the capacity of the hydraulic ejector with double-effect falling film evaporator as compared to lower power 13.5kw, an hour to save 13 tons of cooling water. Water prices by 1.00 / t, drainage price 0.80 yuan / tons, electricity and water, one can reduce the operating costs 143,391 yuan, 3 years to recover all the investment in equipment.
The use of out-tube condensers and water ring vacuum pump structure mixed condenser, cold water tower, water ring vacuum pump with heat pumps, material preheater, mixed condenser, cold water tower and water ring vacuum pump of the triple-effect falling film evaporator, by cooling water pump to the cooling water towers, the cooling water temperature 8 ℃, in the majority of the calculation of evaporator generally take 6 ℃. The pressure of cooling water pumps do not ask for much, as long as the cooling tower circulating water can be sent to the cold water, the course of their work only the cooling water circulating through the use of cold water tower, almost no additional low-temperature water, water-saving effect of special significant, especially in the greater significance of water scarcity areas.
Multi-effect evaporator supporting the choice of pump is single-face mechanical seal pumps, I have been selected valve plant in Jiangsu Jingjiang fluoroplastics alloy pumps, successfully applied to food industry companies Jilin Songyuan pharmaceutical production of vitamin C, then The main purpose of Vitamin C in order to solve the corrosion resistance of the pump to the special requirements, and later successfully applied to RNJM03-5000-type three-way falling-film evaporator, and Dan Long Group and Bright Dairy companies Hailaer applications, the effect has been好. However, this alloy fluoroplastics only mechanical seal pumps water to remove Office, and supporting the electrical power and little change in the past, the selected pump. Subsequently selected the company Wuxi Pump ICB Jan 9 series single-end stainless steel plate stamping mechanical seal pumps, the same used in RNJM02-2400 type double-effect falling film evaporator, the feed pump models ICB50-25-200 type, flow 6.3m3 / h, Head 32m, motor power 2.2kw, the rest of the two materials and a condensate pump pumps are selected ICB32-25-125-type pumps, flow 3.2t / h, Head 20m, motor power 0.55kw, so that RN-JM02-2400 type double-effect falling film evaporator of the total power generating units that only support a lower pump power 6.75kw, an annual 300 days, 16 hours each day (two-shift system of work), the 32,400 yuan a year to save electricity. Jan 9天锡chosen ICB Series pumps, use of in Harbin油脂厂well.
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