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TECHNICAL PAPERS: Gas Turbines: Combustion and Fuels

Demonstration of a Reheat Combustor for Power Production With $CO2$ Sequestration

[+] Author and Article Information
Ben Chorpening

U.S. Department of Energy, National Energy Technology Laboratory, Morgantown, WV 26507-0880Benjamin.chorpening@netl.doe.gov

Geo. A. Richards, Kent H. Casleton

U.S. Department of Energy, National Energy Technology Laboratory, Morgantown, WV 26507-0880

Mark Woike1

NASA Glenn Research Center, Plum Brook Station, Sandusky, OH 44870

Brian Willis

NASA Glenn Research Center, Plum Brook Station, Sandusky, OH 44870

Larry Hoffman

Clean Energy Systems, Inc., Rancho Cordova, CA 95742-7500

1

Current address: NASA Glenn Research Center, Cleveland, OH 44135.

J. Eng. Gas Turbines Power 127(4), 740-747 (Mar 01, 2003) (8 pages) doi:10.1115/1.1924633 History: Received October 01, 2002; Revised March 01, 2003

Abstract

Concerns about climate change have encouraged significant interest in concepts for ultralow or “zero”-emissions power generation systems. In a concept proposed by Clean Energy Systems, Inc., nitrogen is removed from the combustion air and replaced with steam diluent. In this way, formation of nitrogen oxides is prevented, and the exhaust stream can be separated into concentrated $CO2$ and water streams. The concentrated $CO2$ stream could then serve as input to a $CO2$ sequestration process. In this study, experimental data are reported from a full-scale combustion test using steam as the diluent in oxy-fuel combustion. This combustor represents the “reheat” combustion system in a steam cycle that uses a high and low-pressure steam expansion. The reheat combustor serves to raise the temperature of the low-pressure steam turbine inlet, similar to the reheat stage of a conventional steam power cycle. Unlike a conventional steam cycle, the reheat enthalpy is actually generated by oxy-fuel combustion in the steam flow. This paper reports on the unique design aspects of this combustor, as well as initial emissions and operating performance.

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Figures

Figure 1

Schematic of oxy-fuel reheat cycle as proposed by Anderson (3), showing both high-pressure (HP) and low-pressure (LP) expansion stages. Fuel is natural gas (NG).

Figure 2

Schematic of combustor design, showing stirred and plug flow representation of the primary zone and dilution region

Figure 3

Layout of pressure vessel and combustor (note scale at right). Flow is from right to left.

Figure 4

Combustor layout. Flow is from right to left.

Figure 5

Fuel/oxygen/steam mixer. Steam enters annulus at left, and flows to the right (orientation is reversed from previous figure). Oxygen is injected through spokes at locations A, B, and C. Natural gas is injected from centerbody tip at right, at the combustor inlet.

Figure 6

Gas sampling train

Figure 7

CO in dry exhaust, calculated and measured for operation at 10atm with CO2 diluent added to the reactants

Figure 8

Measured species concentrations in dry exhaust gas during 10atm operation

Figure 9

Species concentrations in dry exhaust gas during 5atm operation. Model for major species assumes complete combustion.

Figure 10

Mass conservation at 10atm

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