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High-performance heat exchanger coatings are widely used in PetroChina Daqing Petrochemical Company

Release time: 2018-07-20 09:30:53
The heat exchanger is an important device in the production and operation of the petrochemical industry. The production process in the petrochemical industry is complicated. The working conditions of the heat exchanger are very different. The corrosion environment is complicated. The equipment will be subject to chloride, sulfide, and nitrogen oxidation in the medium during operation. Of organic compounds such as chemicals and organic acids.

The main causes of corrosion leaks in heat exchangers are corrosion on the process medium side, corrosion on the circulating water side (subscale corrosion, microbial corrosion, etc.), electrochemical corrosion, and erosion corrosion. In addition, the medium temperature is high, the working medium pressure difference is large, and the working medium (Water) and the medium (the object to be cooled) have a large temperature difference, and high-temperature corrosion and thermal stress corrosion will also occur, which will damage the heat exchanger tube bundle. Once the heat exchanger tube bundle is corroded or perforated during the production and operation process, it will cause internal leakage of the equipment, which will affect the smooth operation of the device. In recent years, due to the leakage of the heat exchanger due to the internal maintenance of the device, local shutdowns occur from time to time. After the internal leakage, the heat exchanger that is removed and repaired online also occurs in large numbers every year, which increases the additional expenditure of maintenance costs and puts the production device in an emergency state At the same time, overhaul may bring a lot of operational risks.

In order to solve the leakage caused by the above-mentioned corrosion, Daqing Petrochemical Company has adopted a variety of heat exchanger coating anti-corrosion technologies, but in actual use, there have been large brittleness, easy peeling, cumbersome construction, poor adhesion, high temperature resistance and special Problems such as the destruction and corrosion of complex media are not ideal. Therefore, a new type of anticorrosive coating and coating process with long protection life, high temperature resistance and corrosion of special complex media are urgently needed.

The special coating and coating process for the heat exchanger tube bundle silyl anticorrosive coating developed by Yinfan Coatings Co., Ltd. have been successively applied in Daqing Petrochemical Company's refinery, No. 3 chemical plant, No. 1 chemical plant, and water from June 2012 to July 2015. The gas plant and fertilizer plant are implemented and applied; no leakage of heat exchanger corrosion and no effect on heat exchange efficiency occurred during use, and the effect is good. The heat exchanger trialed during the 2012 inspection was inspected after opening in 2015 when the unit was overhauled. The test results showed that the anti-corrosion coating of silicon was intact, and there was no peeling or peeling, ensuring the stable operation of the unit.

           
Contrast of AH-30 3 shell side ( glycol ) before and after corrosion prevention


Comparison of AH-301B pipe side (deep well water) in the power plant of Chemical Plant No. 1 before and after anticorrosion



Comparison of AH-301 A shell side (deep well water) in the power plant of Chemical Plant 1 before and after anticorrosion


Yinfan Coatings Company, based on decades of accumulated scientific research experience, uses modified epoxy resin as the coating base material, which solves the coating coating's water resistance, acid resistance, alkali resistance, salt resistance, high temperature resistance, and corrosion resistance to complex chemical media. difficulty. The coating and construction technology have been applied in petroleum and petrochemical industries.

In March 2017, PetroChina held a heat exchanger tube bundle silicone anticorrosive coating special coating and coating technology exchange and promotion meeting in Beijing, which has been well received by users during more than one year of use.