Graz Cycle

Graz Cycle power plants have exceeded 65% (net electrical cycle efficiency) 
which is far higher than typical of state-of-the-art combined cycle power plant.

The Graz Cycle is also known as the "Zero Emission Power Plant!"

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Graz Cycle

Graz Cycle - the Zero Emission Power Plant!

What is the Graz Cycle?

The Graz Cycle is the only thermodynamic combustion cycle that allows for the retention and capture of carbon dioxide emissions from the "clean combustion" of fossil fuels. The Graz Cycle is the thermodynamic cycle that provides for a "zero emission power plant" which also has the highest available efficiencies using gas turbines.  The Graz Cycle has also been heralded as the "zero emission" power plant.

The Graz Cycle's clean combustion process includes pure oxygen with the fossil fuel thereby enabling for the cost-effective separation of the carbon dioxide emissions from the combustion process through condensation. The additional expense for supplying the oxygen for the clean combustion process - and requirements for an air separation unit, are compensated, in part, through the increase in cycle efficiencies that exceed 65%. The combined efficiency of the Graz Cycle equals or exceeds the thermodynamic performance of  other serious Carbon Capture and Sequestration (CCS) technologies.

In practice, net electrical cycle efficiencies for Graz Cycle power plants have exceeded 65% - which is significantly greater than typical of state-of-the-art combined cycle plants. Greater efficiency means more power for less fuel which means fewer emissions.

According to the DOE web site, the Graz Cycle consists of a high temperature Brayton cycle and a low temperature Rankine cycle with a Heat Recovery Steam Generator or "HRSG."  The Graz Cycle is an oxy-fuel power cycle with the capability of retaining all of the carbon dioxide emissions from the combustion process for further use.  Its cycle configuration aims at highest efficiency by reducing the heat extraction in the condenser to a minimum. A thermodynamic investigation of the Graz Cycle fired with natural gas (CH4) shows a net efficiency of 52.5%, if the efforts for oxygen supply and CO2 compression to liquefaction are considered. If synthesis gas can be used from an external synthesis gas plant at 500C, efficiencies can rise up to 56%.  Studies indicate that further efficiency improvements and simplification of the cycle are possible.


Custom-built CHP, Cogeneration, District Energy 
& Trigeneration Energy Systems

Demand Side Management, District Energy, 
Micro-Grid & Net Zero Energy Solutions

Produce the Clean Power & Energy Your Business Requires with a; CHP, 
Cogeneration or Trigeneration energy system for a fuel cost of 4 cents/kWh 
(with natural gas priced at $4.00/mmbtu)

Graz Cycle

Absorption Chillers  *  CHP Systems  *
 Cogeneration  Enhanced Oil Recovery  *  Trigeneration  Waste Heat Recovery


Clean Power Generation Solutions

CHP Systems (Cogeneration and Trigeneration) Plants 
Have Very  High Efficiencies, Low Fuel Costs & Low Emissions

The Effective Heat Rate is Approximately 
4100 btu/kW & System Efficiency is 92% Plant.

The CHP System below is Rated at 900 kW and Features:
(2) Natural Gas Engines @ 450 kW each on one Skid with Optional 
Selective Catalytic Reduction
system that removes Nitrogen Oxides to "non-detect."


Our CHP Systems may be the best solution for your company's economic and environmental sustainability as we "upgrade" natural gas to clean power with our clean power generation solutions.

Our Emissions Abatement solutions reduce Nitrogen Oxides to "non-detect" which means our CHP Systems can be installed and operated in most EPA non-attainment regions!


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