目前，氢氧化钾片碱生产工艺，较普遍地采用降膜蒸发工艺，氢氧化钾溶液在进入降膜蒸发器及降膜浓缩器的降膜管中，沿加热管内壁形成均匀的液膜并依靠重力下降受热蒸发。
At present, the falling film evaporation process is widely used in the production process of potassium hydroxide flake alkali. When the potassium hydroxide solution enters the falling film tube of the falling film evaporator and falling film concentrator, it forms a uniform liquid film along the inner wall of the heating tube and falls by gravity for heating and evaporation.
降膜蒸发器的加热管外采用来自外管网的0，9MPa的低压蒸汽以及降膜浓缩器产生的二次蒸汽加热，降膜浓缩器的加热管外采用熔盐加热，通过间接传热，以及真空负压技术，逐步提高氢氧化钾溶液温度从而达到沸腾，溶液中的水分部分蒸发，并能得到熔融的90%~95%氫氧化钾，后经片碱机转鼓冷却刮片，进入成品包装。
Outside the heating pipe of the falling film evaporator, 0,9mpa low-pressure steam from the external pipe network and the secondary steam generated by the falling film concentrator are used for heating. Outside the heating pipe of the falling film concentrator, molten salt is used for heating. Through indirect heat transfer and vacuum negative pressure technology, the temperature of potassium hydroxide solution is gradually increased, so as to achieve boiling. The water in the solution is partially evaporated, and molten 90% ~ 95% potassium hydroxide can be obtained, which is cooled and scraped by the rotating drum of the flake alkali machine, Enter the finished product packaging.
在氢氧化钾片碱的实际生产中，却因设备热应力，熔融碱的强氧化腐蚀、碱液冷却固化等一系列问题造成生产的被动局面，因此氢氧化钾片碱生产要求长周期稳定运行，每一次的开停车，空气都会进入系统，更难免使设备表面的氧化镍层脱落，使其下层出现新的表面腐蚀。因此应尽可能减少停车次数，防止因开停车频繁加剧设备的腐蚀，缩短设备的使用寿命。
The caustic soda will enter the production system for a long time, and the caustic soda will be oxidized on the surface of the equipment, which will inevitably lead to the corrosion of the lower caustic soda production system. Therefore, the number of shutdown shall be reduced as much as possible to prevent the frequent startup and shutdown from aggravating the corrosion of the equipment and shortening the service life of the equipment.

在KOH片碱生产过程中，有来自公用工程的低压蒸气，天然气、氮气、循环水、冷却纯水、生产水以及工厂风(压缩空气)、仪表气等外界工艺条件，任何一项的断流，甚至不稳定都会导致片碱系统的生产停车，而其系统自身的工艺操作故障、设备运行故障，仪表控制故障、电气运行故障等，有时也会成为系统停车的关键因素。
In the production process of KOH flake caustic soda, there are external process conditions such as low-pressure steam from public works, natural gas, nitrogen, circulating water, cooling pure water, production water, plant air (compressed air), instrument gas, etc. any interruption or even instability will lead to the production shutdown of flake caustic soda system, and its own process operation failure, equipment operation failure, instrument control failure, electrical operation failure, etc, Sometimes it will also become a key factor in system shutdown.
为保证氢氧化钾溶液能在降膜蒸发器换热管内能形成均匀的液膜，防止因液膜断裂形成干壁区造成对列管热应力腐蚀，要求低负荷不低于设计负荷的30%，正常生产时要求在60%~100%额定产量范围内投料生产;开车投料期间不宜投料太多，以防止因开始投料过多，碱液在列管内不能成膜或膜太厚，碱液内水分不完全蒸发，浓缩过程不能很好进行，在此阶段，流量过大或过小都会腐蚀镍材，损坏设备，增加片碱中的镍含量。
In order to ensure that the potassium hydroxide solution can form a uniform liquid film in the heat exchange tube of the falling film evaporator and prevent the thermal stress corrosion of the column tube caused by the formation of dry wall area due to the fracture of the liquid film, the low load is required to be no less than 30% of the design load. In normal production, it is required to be put into production within the range of 60% ~ 100% of the rated output; During the start-up feeding, it is not suitable to feed too much to prevent the alkali liquor from forming a film or the film is too thick in the row pipe due to too much feeding, the water in the alkali liquor is not completely evaporated, and the concentration process cannot be carried out well. At this stage, too large or too small flow will corrode the nickel material, damage the equipment and increase the nickel content in the sheet alkali.
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