In a vertical falling-film evaporator which constitutes the MWS evaporates some of the feed water in the heat transfer tube, steam is generated while leading to the tube end. Furthermore, not evaporated feed water (also referred to as saturated water) is dropped into evaporator bottom, temporarily staying. Then, under the influence of the vapor flow by effective height of the evaporation chamber, there is a case where a part of the saturated water is rolled up entrained
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