Bechtel Power Corporation

Harvey Wen

Charles L Kimtantas

Rattan K Tawney

The present invention relates to a method for combined SOand COremoval from flue gas, which includes removing both COand SOin a primary fractionation column and two polishing columns, the method comprising: a) hot flue as pretreatment, including flue gas SOremoval by dry sorbent injection; b) compressing the treated hot flue gas by a multi-stage compressor; c) separation of CO, SOand non-condensable gases; d) subjecting the COand SOto separate polishing columns; and e) combining streams from the primary fractionation column and the two polishing columns for power recovery.

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A process of generating power utilizing a low level heat from a raw syngas produced in a quench gasifier is disclosed. The process includes a first stage that includes: producing raw syngas at the quench gasifier, making 150 psi saturated steam from the produced raw syngas, superheating the saturated steam, and using the superheated saturated steam in a low pressure steam turbine to generate power. The process includes a second stage that includes: providing the raw syngas and a process condensate stream to a thermal fluid vaporizer to vaporize an organic thermal fluid, and using the vaporized organic thermal fluid in an expander turbine to generate power via an organic Rankine cycle.

Method and apparatus for refueling existing natural gas combined cycle plant as a non-integrated gasification combined cycle plant

A method of treating gas, such as flue gas, is provided. Flue gas is received into a vessel. The flue gas in the vessel is cooled by at least 17 degrees F. to a temperature of 120 F or lower. Also in the vessel, SOcompounds are removed such that the concentration of SOremaining in the flue gas is between 0 ppmv and 10 ppmv. After the flue gas is cooler and SOcompounds are removed in the vessel, the flue gas is transmitted to a flue gas carbon dioxide scrubbing unit.

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Boyds, MD, United States of America

Harvey Wen