OXY-FUEL TURBINES

Clean Energy Systems gas generators are capable of producing drive gas over a wide range of pressures and temperatures. Therefore, they are ideally suited to tailoring drive gas generation to the inlet design conditions of combustion or steam turbines. This paradigm shift in gas turbine technology enables CES to design gas turbines that work with steam/CO2 drive gas.

Because drive gas from the gas generator exits at optimal pressure and temperature, CES oxy-fuel turbines (OFTs) have no need for the air compressors and combustor cans that are essential components of conventional turbines. By removing these components, CES' technology reduces parasitic load and allows approximately three times more power to be extracted from the conventional turbine section now making the main element of these oxy-fuel expander turbines. 

When designing the OFT-J79 and the OFT-900, CES concentrated on re-purposing existing turbines that are based upon proven, decade-old technology, such as the aero-derivative GE J-79 and the industrial Westinghouse W-251 (Siemens SGT-900). Always striving to push boundaries, CES plans to exploit the advantages of OFTs further by basing future designs on more progressive, current technology status quo. Additionally, instead of basing future designs on existing turbines, it is intended to working with our turbine OEM partners to developing expanders based on the capabilities of the CES gas generators. With steam generated at pressures easily exceeding 2,000 psi and more and temperatures reaching up to 3,200 F, leaps in turbine expander efficiencies can be expected.

 

CES OFT-J79

In partnership with LM-Alternatives, a California-based aircraft equipment specialist and gen-set developer, Clean Energy Systems has brought the concept of a simple, effective, available expander turbine to life. By repurposing a reliable workhorse engine used for decades in supersonic jets like the F-4 Phantom, CES harnessed the power of the gas generator, expanding its steam/CO2 drive gas from roughly 170 psia to 30 psia or sub-atmospheric and generating 30 to 45 MW of electricity. 

Applications

Peaking Power Plants

Simple ZEPPs

CO2 EOR Recycle Facilities

Phase I CO2 EOR Surface Facilities

Typical dimensions 

L30' x W12' x H12' in operational enclosure 

Features

  •  50% lower capital cost than comparable units
  • Three times the power output of conventional gas turbines of equivalent size
  •  Fast start - full load in less than 3 minutes
  •  Output unaffected by ambient temperature
  •  Capable of 100% CO2 capture

 

OFT-900

Clean Energy Systems developed the OFT-900 to take full advantage of the capabilities unlocked by the CES gas generator. In collaboration with Siemens Energy and Florida Turbine Technologies (FTT) and sponsored by the Department of Energy, CES re-designed Siemens' SGT-900 (the former Westinghouse W-251) for oxy-fuel combustion, creating the OFT 900. 

The CES system improves cycle efficiencies while eliminating various pollutants, including nitrogen oxides (NOx). The size, efficiency, and high availability of the OFT-900 make it the perfect centerpiece for large oxy-fuel cycle zero-emissions power plants.

CES redesigned Siemens' SGT-900 to achieve near perfect combustion of oxy-fuel by eliminating the 19-stage compressor, adding a thrust balance system, and replacing traditional combustor cans with clean-burning CES re-heater oxy-combustors. The changes allow roughly 150 MWe to be extracted from this 43 MWe gas turbine design. 

Siemens Energy has taken over the development of the OFT-900 for its commercial deployment and it will be known as the SXT-150 in its OEM portfolio. For more information, please refer to www.energy.siemens.com

Applications

Peaking Power Plants

Simple ZEPPs

CO2 EOR Recycle Facilities

Phase I CO2 EOR Surface Facilities

Typical dimensions 

L50' x W19' x H25' in operational enclosure