Power plants – Combustion products used as motive fluid – Process
Reexamination Certificate
2001-10-10
2003-04-22
Casaregola, Louis J. (Department: 3746)
Power plants
Combustion products used as motive fluid
Process
C060S039120
Reexamination Certificate
active
06550252
ABSTRACT:
BACKGROUND OF THE INVENTION
Production of fuel gas by partial oxidation of a hydrocarbonaceous fuel is known in the art. After further processing, the fuel gas is burned in a combustion turbine, purified, optionally mixed with a diluent, such as steam or nitrogen, and burned in a gas turbine to produce mechanical work and electrical energy.
The prior art, however, does not teach or suggest the instant invention. Gasification is integrated with hydrotreating such that hydrogen gas obtained from synthesis gas gasification process is used to hydrotreat petroleum liquids. The remaining synthesis gas is burned in a combustion turbine to generate power. Nitrogen is used to strip hydrogen and volatile hydrocarbons from the hydrotreated petroleum liquid under conditions such that this stripper gas can be sent to the combustion turbine.
SUMMARY OF THE INVENTION
The present invention provides an integration of hydrotreating and power generation. The invention comprises using an inert gas, preferably nitrogen, to strip volatiles from a hydrotreated oil. This stripper gas is then added to fuel gas and fed to a combustion turbine, where combustibles in the fuel gas and stripper gas are combusted, and where the exhaust gases are expanded through the turbine to generate power.
In one embodiment, the invention includes an integration of the processes of gasification, hydrotreating, and power generation. The gasification process separates air into substantially pure oxygen and nitrogen. The substantially pure oxygen is used to gasify hydrocarbonaceous material, thereby producing synthesis gas. A hydrogen-enriched gas is separated from the synthesis gas. This hydrogen gas is used to hydrotreat a hydrocarbon liquid, producing an upgraded hydrocarbon liquid but also producing as a byproduct methane, ethane, propane, and the like. The concentration of these hydrocarbons builds up in the hydrogen gas, necessitating a purge stream. This purge stream may be added to the remaining synthesis gas, and this gas is advantageously burned in a combustion turbine to generate power. Nitrogen, a byproduct of the manufacture of substantially pure oxygen, is advantageously added to the combustion turbine fuel to increase power and to reduce nitrous oxides (NO
x
) emissions. The hydrotreated liquid contains volatile hydrocarbons, hydrogen, and contaminants such as hydrogen sulfide. These volatiles are stripped with the nitrogen byproduct of making the substantially pure oxygen. The stripping is at a pressure sufficient to allow the stripper gas, now containing hydrocarbons and hydrogen, to be added to the combustion turbine fuel without additional compression. This is efficient use of the stripped combustibles, and the nitrogen also increases power generation and reduces NO
x
emissions.
REFERENCES:
patent: 3868817 (1975-03-01), Marion et al.
patent: 3998609 (1976-12-01), Crouch et al.
patent: 4099382 (1978-07-01), Paull et al.
patent: 4158948 (1979-06-01), Schlinger
patent: 4178758 (1979-12-01), Paull et al.
patent: 4328006 (1982-05-01), Muenger et al.
patent: 4377132 (1983-03-01), Koog et al.
patent: 4462339 (1984-07-01), Jahnke et al.
patent: 4801307 (1989-01-01), Muenger et al.
patent: 5472986 (1995-12-01), Van Dijk
patent: 6225358 (2001-05-01), Kennedy
patent: WO 97/10416 (1997-03-01), None
patent: 0 955 455 (1999-11-01), None
patent: WO 00/37356 (2000-06-01), None
patent: WO 00/42123 (2000-07-01), None
Kirk-Othmer Encyclopedia of Chemical Technology, Fourth Edition vol. 7, John Wiley & Sons, pp. 662-664.
Johnson Kay A.
Rodarte Alma I.
Wallace Paul S.
Casaregola Louis J.
Texaco Inc.
Turner Frank C.
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