Evaluation of mercaptoazoles as corrosion inhibitors in simulated sulphur dioxide scrubber environments

Abstract

The emission of SO2, a dangerous atmospheric pollutant, is the major problem with increasing the use of coal as fuel in various industries, particularly in thermal power plants. A variety of methods for minimizing the SO2 emission have been reported in the literature, among which the desulphurization of the flue gas, generated by combustion of coal receives much attention and is termed as flue gas desulphurization (FGD). FGD scrubbers have found widespread use in thermal power plants, smelters, incinerators and various refining operations. The scrubber parts must resist corrosion from solution which have a varying degree of acidity and erosion, besides containing substantial concentrations of chlorides and SO2, and the unfavourable conditions of fluctuations in temperature. The currently‐used type 316L stainless steel material in many FGD installations, were reported to have failed, due to the localized corrosion attack by the aggressiveness of the environment encountered during scrubbing of SO2. Normally, the improvement in corrosion performance of the construction materials can be achieved by:

Citation

Rajendran, N. and Rajeswari, S. (1995), "Evaluation of mercaptoazoles as corrosion inhibitors in simulated sulphur dioxide scrubber environments", Anti-Corrosion Methods and Materials, Vol. 42 No. 3, pp. 13-16. https://doi.org/10.1108/eb007360