(702d) The Effect of the SO2 :HCl Ratio On Active Oxidation of WTE Superheater Materials

Boiler corrosion in waste-to-energy facilities, municipal solid waste (MSW) combustion, is much greater than in comparison to other power plants. This is largely attributed to the chloride concentration in MSW and the subsequent reactions that occur with generated gaseous HCl and volatilized metal chlorides under elevated metal temperatures.  In an effort to engineer new methods to mitigate corrosion, the addition of SO2 to WTE flue gas streams has been shown in previous works to reduce corrosion. The following presentation is part of ongoing work to understand the effect of the SO2:HCl ratio on the corrosion of alloys exposed under superheater temperatures and flue gas compositions. Previous results by the author have shown that in the absence of metal chlorides, the addition of sulfur to increase the SO2: HCl ratio had no consistent trend on the corrosion rate of SA178A, a commerical low carbon steel, under various typical flue gas water vapor concentrations. This work will further discuss the influence of water vapor on the system on the effect of the SO2: HCl ratio as well as the influence of metal chlorides.