Minimal sour gas emission for an integrated gasification combined cycle complex

a gasification combined cycle and gas emission technology, applied in the direction of gasification process details, gas contaminants removal, inorganic chemistry, etc., can solve the problems of high sulfur emission, less nitrogen in the product, and less than normal nitrogen emission of contaminants such as sulfur

Inactive Publication Date: 2011-05-26
HYDROGEN ENERGY INT
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  • Abstract
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Problems solved by technology

Second, the total sulfur content is limited to 30 ppmv or less to further minimize corrosion issues and to mitigate any health concerns to workers or the public in the event of a mechanical failure or release, Third, nitrogen in the product is limited to less than about 2 vol % since excessive amounts of nitrogen may significantly inhibit EOR and permanent sequestration of CO2.
As is well known to those skilled in the art, this results in higher than normal emissions of contaminants such as sulfur.
Accordingly, the start-up of a partial oxidation gas generator presents special challenges, including dealing with the contaminant emissions.

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  • Minimal sour gas emission for an integrated gasification combined cycle complex
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  • Minimal sour gas emission for an integrated gasification combined cycle complex

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[0036]Broadly, in accordance with the present invention the syngas production zone or gasifier in an IGCC complex is started up with a clean, sulfur-free, containing less than about 10 ppmv sulfur hydrocarbon-containing feedstock such as natural gas or a light hydrocarbon liquid such as methanol. The sulfur-free syngas produced in the gasifier, a sweet reducing gas, is then sent to a flare. When the downstream acid gas removal unit and the sulfur recovery unit and the tail gas treatment unit are commissioned, the clean fuel is switched to a high sulfur solid fuel. After the AGR is fully commissioned, the acid gas (H2S and other contaminants) are concentrated and sent to a sulfur recovery unit e.g. Claus unit to make elemental sulfur. If the acid gas concentration is less than 25% vol H2S in the acid gas during the start-up, such acid gas is routed to a sour gas scrubber such as an emergency caustic scrubber. Once the SRU is operational, the small amount of unconverted H2S in the eff...

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Abstract

Disclosed is a process to start-up, operate, and shut down a gasifier and an integrated gasification combined cycle complex with minimal sour gas emissions while additionally reducing the release of contaminants such as carbon monoxide, hydrogen sulfide, and nitrogen oxides. The process is accomplished by starting up with a sulfur free feedstock and by scrubbing any ventable sour gases free of sulfur contaminants prior to release of any such gases to the atmosphere.

Description

[0001]This application claims benefit of provisional application Ser. No. 61 / 084,774 filed Jul. 30, 2008, which is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]The present invention relates to systems and methods of starting up, operating and shutting down a gasification reactor and an integrated gasification combined cycle (“IGCC”) complex.[0003]Gasification was first used to produce “town gas” for light and heat. Additionally, coal and other hydrocarbons have been gasified in the past to produce various chemicals and synthetic fuels. More recently gasification technology has been employed to generate electricity in an IGCC complex wherein coal or another hydrocarbon is gasified by partial oxidation using oxygen or air to syngas. Typically, this syngas is then cleaned of particulates, sulfur compounds and nitrogen compounds such as NOx compounds and then subsequently passed to gas turbine where it is fired. Additionally the hot exhaust gas from ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10J3/46
CPCC10J3/00C10J3/726C10J3/728C10J2300/0989C10J2300/1653Y02E20/16C10K1/004C10K1/101C10K1/143F05D2220/722Y02E20/18C10K1/003
Inventor BALMAS, MARIACHAN, HENRY C.SKINNER, CRAIG
Owner HYDROGEN ENERGY INT
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