Power plants – Combustion products used as motive fluid – Combustion products generator
Patent
1997-08-18
1998-10-13
Thorpe, Timothy
Power plants
Combustion products used as motive fluid
Combustion products generator
60 3923, 60 3929, 60 3955, 431 4, 431 10, 251212, F02C 330, F02C 324, F02C 730, F02K 900
Patent
active
058195408
ABSTRACT:
A combustor for generating hot gas in order to rotate a turbine is able to burn fuel with a high vanadium content without emitting appreciable vanadium pentoxide to the turbine. The combustor includes a primary combustion zone for burning fuel in a rich fuel/air environment a quenching zone for cooling the hot gas and unburned fuel a secondary combustion zone for burning previously-unburned fuel. The fuel burned in the secondary combustion zone raises the temperature in the secondary combustion zone above the temperature of the quenching zone. The result of burning the fuel in a rich environment in the primary combustion zone is that most of the vanadium present in the fuel forms vanadium trioxide or vanadium tetroxide rather than vanadium pentoxide. Cooling the hot gas quickly in the quenching zone removes most of the remaining vanadium pentoxide by transforming it to vanadium trioxide or vanadium tetroxide. The melting point of vanadium trioxide and vanadium tetroxide is substantially higher than the melting point of vanadium pentoxide, which would form troublesome deposits on the combustor walls and on the turbine if it were not removed. Due their high melting points, however, vanadium trioxide and vanadium tetroxide form a fine dust which is swept along with hot gas and thus fouls neither the combustor nor the turbine.
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Kim Ted
Thorpe Timothy
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