What is the effect of low combustion temperatures when burning #6 oil with high sulfur content?

When burning #6 oil, which has a high sulfur content, low combustion temperatures can lead to increased corrosion within the combustion system. High sulfur oils produce sulfur oxides during combustion, and if the temperatures are not sufficiently high, these oxides can condense and form sulfuric acid when they come into contact with moisture. This acidic environment promotes corrosion in boilers, heat exchangers, and other components of the heating system, effectively damaging materials over time.

Consequently, although combustion efficiency might decrease and soot may form under these conditions, the primary concern with low combustion temperatures when utilizing high sulfur oil is indeed the corrosive effects that result from the production of acidic compounds. This highlights the importance of maintaining optimal combustion temperatures to mitigate corrosion risks and ensure the longevity of the equipment.