DETERMINATION OF THE SOURCE AND MECHANISM OF CORROSION FORMATION OF THE LIQUOR HEATER TUBES IN THE KCl PRODUCTION

UDC 620.193

  • Frantskevich Vitaliy Stanislavovich – PhD (Engineering), Associate Professor, Head of the Department of Machines and Apparatus for Chemical and Silicate Production. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: fvs2@tut.by

  • Paspelau Andrey Uladzimiravich – scientific researcher, the Center for Physical and Chemical Research Methods. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: Andrei29088@mail.ru

  • Kostyukovets Dmitriy Anatol’yevich – Director. LLC “UMKA” (32, Mira Ave., 223707, Soligorsk, Republic of Belarus). E-mail: dicd@bk.ru

DOI: https://doi.org/10.52065/2520-2669-2021-247-2-100-106

Key words: titanium corrosion, electronic microscopy, electrochemical studies, erosion-corrosion damage, alkaline deposits, overheating.

For citation: Frantskevich V. S., Paspelau A. U., Kostyukovets D. A. Determination of the source and mechanism of corrosion formation in the liquor heater tubes in the KCl production. Proceedings of BSTU, issue 2, Chemical Engineering, Biotechnologies, Geoecology. 2021, no. 2 (247), pp. 100–106 (In Russian). DOI: https://doi.org/10.52065/2520-2669-2021-247-2-100-106.

Abstract

Corrosion of technological equipment, utilities and structures is a very serious problem for industrial enterprises. The object of research was a liquor heater in the production of potash fertilizers by the halurgical method. Due to the high aggressiveness of the environment, which significantly increases with an increase in its temperature, titanium alloy of the VT-1-0 brand is used as the main structural material of the heat exchanger. The work was carried out by order of the heater manufacturer and its operating organization. The aim of the work was to study the case of severe corrosion of titanium tubes of a heat exchanger exposed to solvent liquor at high temperatures and pressures, expressed in multiple perforations up to 30 mm in size on the steam supply side. When operating heat exchangers operating in difficult conditions, it is very important to take into account not only the properties of the corrosive environment and the material from which the equipment is made, but also the operating temperatures and pressures, especially their differences, the methods and frequency of removal of the formed deposits. According to the results of electrochemical research methods, scanning electron microscopy, elemental analysis of the presented samples of titanium alloy and corrosion products, as well as analysis of the method and frequency of removal of alkaline scale, the sources and mechanism of corrosion formation were determined. Electrochemical measurements showed a clear onset of active corrosion above 80°C. Suspended solids flow and a high degree of fouling causing cracks and possibly overheating could be significant factors in the corrosive destruction of the heat exchanger tubes. The presence of possible hydraulic shocks, vibrations, high pressures and overheating can very quickly aggravate the situation in the presence of the factors described in the article.

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