High-temperature coal gasification process streams consist of a corrosive gas stream in which solid particulates are entrained. The synergistic effects of the gas stream and particulates can cause erosion/corrosion of structural materials. In addition to the solid and gas phases, liquid phase constituents can be involved in the erosion/corrosion process. These liquid phase constituents are derived both from metallic sulfide corrosion products and sulfide ash constituents in the coal at high operating temperatures. The effects of these liquid constituents on the erosion/corrosion process are discussed.

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