What are the methods of heat exchanger cleaning?
In the long-term use of plate heat exchanger, the liquid inside with heat exchanger heating surface oxidation will produce a precipitate of long past will form a hard scale slowly, it will greatly reduce the efficiency of the heat exchanger, resulting in serious waste heat exchanger, so we need cleaning of plate heat exchanger.
Heat exchanger cleaning
The common heat exchanger cleaning 2 ways:
1, mechanical cleaning is the most simple way of cleaning, but this not only repeated mechanical cleaning of plate heat exchanger heating surface scratches easily damage the service life of the heat exchanger (not recommended to use this way).
2, the principle is to use chemical cleaning, pickling products and scale chemical reaction and its basic principle, so that the scale slowly dissolved.
The steps of cleaning the scale:
1) wash: prior to pickling, the heat exchanger inside the heat exchanger to open washing, no mud, dirt and other impurities, so as to improve the pickling effect, but also reduce the acid consumption of pickling.
2) pour the cleaning liquid into the cleaning facility, and then inject the plate heat exchanger.
3) pickling: heat exchanger static immersion 2H will be filled with acid solution, then the continuous cycle of 3H ~ 4h, with every 0.15h and alternately cleaning. After the pickling, if the acid liquid pH value is greater than 2, acid liquid can be reused, otherwise, should be diluted in the acid lotion and back off.
4): after pickling, alkali washing with three sodium phosphate, softening water according to a certain proportion of preparation, alkali cleaning of heat exchanger using dynamic circulation mode to achieve acid-base neutralization, the heat exchanger plate no corrosion.
5) washing: after the end of the alkaline wash, with a clean water to soften, repeated on the heat exchanger to wash 0.15h, the heat exchanger in the residue completely washed clean.
The cleaning step above is the common heat exchanger, reasonable cleaning will not only play a role in the maintenance of plate heat exchanger maintenance effect, which is also the heat exchanger performance, refuse to waste heat