Investigating the Causes of Corrosion in Heat Exchanger of Waste Incinerator System of Fajr Petrochemical and Providing Suggestions for Changing the Structure of Heat Exchanger

Abstract

Optimization of operational performance of heat exchanger of waste incinerator systems from the temperature point of view in order to reduce corrosion is considerably important. At Fajr Petrochemicals, equipped with a biological waste incinerator system, some difficulties have arisen including corrosion in the equipment such as the heat exchanger and filter, which is the main factor of this corrosion rests in the heat exchanger. Therefore, the modeling of heat exchanger was investigated to find the causes of condensation formation and acid production. The modeling was done based on Computational Fluid Dynamics (CFD), and it was determined that, due to entry of hot gases to the heat exchanger and instantaneous cooling of them, humidity and condensation are formed in some parts of the heat exchanger and will cause the formation of acids and corrosion in it. In this study, a developed heat exchanger model is suggested so that the cooling of hot entry gases would be done in a mild manner, and also it would be possible to have a temperature control over outlet gases from the Heat Exchanger, and after the operational construction of the suggested model, and installation of it in the system, the previous difficulties were no longer.