(376f) Coal-Based Oxy-Fuel System Evaluation And Combustor Development

MacAdam, S., Clean Energy Systems, Inc.
Anderson, R., Clean Energy Systems, Inc.
Pronske, K., Clean Energy Systems, Inc.
Viteri, F., Clean Energy Systems, Inc.

Clean Energy Systems (CES) has a developed a novel oxy-fuel power generation concept that uses proven aerospace technology to enable zero-emission power generation from fossil fuels. The core of the technology is a high-pressure oxy-combustor that burns gaseous fuels with oxygen in the presence of water to produce a steam/CO2 drive gas for turbines or heat recovery steam generators (HRSG's). The oxy-combustor has been demonstrated for over 1,300 hours on natural gas, supplying power to the grid at CES's 20 MWt Kimberlina Power Plant outside Bakersfield, CA.

Under a $4.6 million, three-year award from DOE, CES is developing the oxy-combustion technology for coal-based power plants that use synthesis gas as the fuel. It is closely associated with a DOE award to Siemens Power Generation to develop high-temperature turbines that would be powered by steam/CO2 working fluid from the CES oxy-syngas combustor. In Phase I of the project, CES identified optimum power generation cycles for near-term (2010) and long-term (2015) applications with >99% CO2 capture, and conducted cycle analyses to determine the expected cycle efficiencies. CES also modified the Kimberlina Power Plant for operation on simulated coal syngas. In this task, a blending station was installed to provide up to 5 MWt of simulated syngas mixtures, and an oxygen/syngas/water injector was fabricated and installed in the combustor. CES then successfully conducted combustion tests with simulated coal syngas and hydrogen-depleted syngas at pressures of up to 340 psia (23.4 bar). In Phase II of the project, CES is performing a detailed design of a 50 MWt syngas combustor, which will be fabricated and tested in Phase III.

The first commercial offering of the CES technology for coal systems is a proposed 200 MWt plant design, a key component of which is the 50 MWt syngas combustor. In these plants, the steam/CO2 drive gas will be delivered to a high-pressure HRSG to raise steam for commercially-available steam turbines. The plant will produce 40 MWe (net) of clean power, along with 2,000 tpd (35 mmscfd) CO2 for enhanced oil recovery (EOR) operations.