Cleaning the heat exchanger pipes from salt deposit
https://doi.org/10.31615/j.corros.prot.2023.107.1-4
Abstract
The operation of heat exchange equipment is associated with the formation of scale deposits as a result of the crystallization of calcium and magnesium salts. E ffective sediment removal is still a challenge. The paper presents the results of a study that shows that 10% sulfamic acid dissolves the precipitate up to 46% in the PP-1 chemical water treatment (ChWT) heat exchanger tube, while the average corrosion rate of the heat exchanger tube metal is 0,31 g/m2·h. Deposits from the tubes of the PP-1 ChWT heat exchanger were also subjected to dissolution with hydrochloric acid. A kn own method for producing inhibited hydrochloric acid, including the introduction of a nitrogen-containing corrosion inhibitor. Thiourea was used as a nitrogencontaining inhibitor. According to the results of laboratory tests, it was shown that 20% hydrochloric acid with the addition of thiourea 1%, 5%, 10%, 15% and 20% completely dissolves the precipitate, while the corrosion rate of the metal of the heat exchanger tube was 0,685 g/m2·h, 1,17 g/m2·h, 2,12 g/m2·h, 2,76 g/m2·h, 4,79 g/m2·h. It should be noted the negative effect of zinc present in brass on the protective properties of such corrosion inhibitors as urotropine and thiourea, which show good protective effects on pure metals (iron, copper). This is apparently due to its predominant dissolution from the alloy upon contact with acids and further dissolution of the base metal itself. The optimum protective effect of a corrosion inhibitor of 55,2% was shown on a coppe plate immersed in a solution of 5% hydrochloric acid + 100 mg/d m3 of AZ 8104 inhibitor
About the Authors
A. T. Tayekenova
JCS D.V. Sokolsky Institute of Fuel Catalysis and Electrochemistry
Kazakhstan
Kazakhstan
Arailym T Taiekenova, Senior Engineer of the Competence Center for Corrosion Problems
142, Kunaeva st., Almaty
A. K. Akurpekova
JCS D.V. Sokolsky Institute of Fuel Catalysis and Electrochemistry
Kazakhstan
Kazakhstan
Altynai K. Akurpekova, Ph.D. in Chemistry, Head of
research laboratory
142, Kunaeva st., Almaty
A. T. Tastemirova
JCS D.V. Sokolsky Institute of Fuel Catalysis and Electrochemistry
Kazakhstan
Kazakhstan
Aidana T. Tastemirova, Lead Engineer
142, Kunaeva st., Almaty
A. N. Nefedov
JCS D.V. Sokolsky Institute of Fuel Catalysis and Electrochemistry
Kazakhstan
Kazakhstan
Alexander N. Nefedov, Ph.D. in Chemistry, Head of the
Competence Center for Corrosion Problems
142, Kunaeva st., Almaty
O. Dalelhanuly
JCS D.V. Sokolsky Institute of Fuel Catalysis and Electrochemistry
Kazakhstan
Kazakhstan
Orken Dalelhanuly, Senior Engineer of the Competence Center for Corrosion Problems
142, Kunaeva st., Almaty
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Review
For citations:
Tayekenova A.T., Akurpekova A.K., Tastemirova A.T., Nefedov A.N., Dalelhanuly O. Cleaning the heat exchanger pipes from salt deposit. Theory and Practice of Corrosion Protection. 2023;28(1):29-42. (In Russ.) https://doi.org/10.31615/j.corros.prot.2023.107.1-4
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