(1) Control the pickling temperature: increasing the pickling temperature is con✔ducive to improving the descale effect, but too high the temperature will also aggravate the cor♠rosion of the pickling liquid on the heat exchanger plate, anσd 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 comb₹ination of static soaking and dynamic cycling. The pickling time is static soaking for 2h, a÷nd then dynamic cycling for 3-4h. In the pickling process, the pickling concentra✔tion should be sampled frequently, and when the difference between the two adjacent tests is less αthan 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 corr±ode, 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 understan"ding, not to let you clean your own stainless steel heat exchanger tube. Professional tδhings to professional people to do, just like professional stainless steel  heat exchanger products to Yongye steel industry to produce.