Evaporative cooler is very wide in the synthesis section in the application scope, synthetic ammonia, methanol synthesis, ice machine posts are equipped with an evaporative cooler, cooling, the cooling effect of separation it is obvious. The cooling water to the tube with water through evaporation, water takes heat away, and play a role of cooling, while the upper part of a fan, can pump water vapor and heat. However, dust and other dirty things are easy to be sucked into the evaporative cooling water system, water is evaporated, the dirty things left, long-term accumulation, dirt easily attached on the surface of the tube, heat transfer effect. If an entire evaporative cooling, need more than half an hour, very large impact on the process, especially the two stage ammonia and methanol, only three sets of evaporative cooling, if stopped a greater impact on the process. Therefore, the purification plant according to the actual situation, the evaporative cooling separated by separator, the water in the water One divides into two., each side with a water pipeline, in cleaning the evaporative cooling, half can be stopped only a, this is equivalent to stop 1/6 evaporation cooling system, the degree of influence process is greatly reduced, at the same time instant cleaning the evaporative cooling.