Evaluation of SO3 Measurement Techniques in Air and Oxy-Fuel Combustion

摘要: SO2 is enriched in wry-fuel combustion due to flue-gas recycle, and a significant higher SO3 concentration can be expected compared air-firing. Since cause high low temperature corrosion, it important measure the under oxy-fuel fired conditions. However, measurement of not straightforward, since highly reactive gas. This paper presents an experimental study Chalmers test unit, comparing different techniques applied during air combustion. Propane (60 kW(th)) was used as fuel injected oxidizer generate controllable amount SO3. The measured with four techniques: controlled condensation method, salt isopropanol absorption bottle Pentol monitor (previously: Severn Science analyzer). method standard for comparison. Additionally, acid dew-point meter. gave comparable results, repeatability these methods good. concentrations differed average less than 20% from obtained method. With large absorbed solution, which gives positive bias if oxidized sulfate solution. minimized by reducing time, bubbling argon through bottles after force out, analyzing solution immediately measurement. No principal differences between measuring air-firing were obtained. correction factor mass flow meter has because CO, operation.