(1) Control the pickling temperature: increasing the pickling temperature is conducive to improving the descale effect, but too high the temperature will also aggravate the corrosion of the pickling liquid on the heat exchanger plate, and it is appropriate to control the pickling temperature at 60℃.

(2) Control the concentration of the pickling solution: the pickling solution should be prepared according to the concentration of formic acid 81.0%, water 17.0%, buffer 1.2%, surfactant 0.8%, and the cleaning effect is excellent.

(3) Control pickling method and time: pickling method should be a combination of static soaking and dynamic cycling. The pickling time is static soaking for 2h, and then dynamic cycling for 3-4h. In the pickling process, the pickling concentration should be sampled frequently, and when the difference between the two adjacent tests is less than 0.2%, the pickling reaction can be considered to be over.

(4) Passivation treatment: After pickling, most of the scale and metal oxide on the surface of the plate heat exchanger are dissolved and shed, exposing new metal, which is easy to corrode, so after pickling, passivation treatment is carried out on the heat exchange segment.

Of course, the pickling process is just to let you have an understanding, not to let you clean your own stainless steel heat exchanger tube. Professional things to professional people to do, just like professional stainless steel heat exchanger products to Yongye steel industry to produce.