| 摘要 |
PROBLEM TO BE SOLVED: To provide a multistage flash evaporator dispensing with the labor for attaching a ring to each condensing pipe and the production cost of the ring, ensuring airtightness, simple in structure and easy to produce. SOLUTION: A multistage flash evaporator has the condensing pipe bundle piercing the partition 7 between two condensing chambers different in pressure and is equipped with two vertical plates 21 having a large number of through- holes 21a through which the respective condensing pipes 5a of the condensing pipe group are inserted and the granular packing material 26 charged in the gap between both vertical plates 21. As the granular packing material 26, silica sand or gypsum having a particle size smaller than the gap between each condensing pipe 5a and the peripheral edge of each through-hole 21a. In the case of silica sand, silica sand is easily injected in the gap between both vertical plates and can be taken out of the gap between them if necessary. In the case of gypsum, gypsum is reacted with water to be solidified and the gaps between particles are eliminated to enhance sealability.
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