Catalytic hydrogenation was developed to remove sulfur from residual oils, but it also reduces the fuel viscosity and removes most of the vanadium, sodium, nitrogen, and other impurities. Eleven desulfurization operating worldwide are producing over 325,000 bbl/day (51,692 m3/d) of boiler fuel with 1 percent sulfur, starting with residual of 4 percent sulfur content. More severe versions of the process are available to reduce sulfur content to 0.3 or 0.1 percent. Hydrodesulfurized residuals should be attractive fuels for gas turbine of combined-cycle power plants. With fuel sulfur content reduced to meet emissions standards, fuel constituents responsible for turbine corrosion and deposits are also minimized.

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