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延长氧化铝车间蒸发器蒸煑管的寿命问题是非常重要的。通常管子工作90～100天之后,就完全损坏需要更换新的。管子的局部损坏开始很早,管子不是在全长上腐蚀,主要是在蒸气进入区,即强烈沸腾开始区:约在距管端1.5公尺处。损坏的管子的断面表明,主要损坏是在近1公尺的区域内,且在端头停止。延长蒸发器寿命方法的探寻,按照两个方向进行:1)对于管子的耐腐材料的选择;2)溶液在管壁外沸腾的结构的选择。从在硷介质中镍的稳定性出发,并考虑到类似条件下某些设备的操作经验斯维尔德洛夫分院工作组曾经建议将蒸煑管的内表面镀镍。
It is very important to extend the service life of the evaporator tube of the alumina plant. Usually 90 to 100 days after the tube work, it is completely damaged need to be replaced. Local damage to the pipe begins very early and the pipe does not corrode over its full length, mainly in the vapor entry zone, where the boil starts: about 1.5 m from the pipe end. The broken pipe section shows that the main damage is in the area of nearly 1 meter and ends at the end. The search for ways to extend the life of an evaporator follows two directions: 1) the choice of decay resistant material for the pipe; and 2) the choice of the structure where the solution boils off the pipe wall. Proceeding from the stability of nickel in alkaline media and taking into account the operating experience of certain equipment under similar conditions, the Sverdlovofel team advised on the nickel plating of the inner surface of the steam pipe.