Cheng Cycle
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What is the Cheng Cycle?

The Cheng Cycle is a highly flexible and efficient method of optimizing a cogeneration plant, and more specifically a combined cycle power plant, which also provides a high amount of flexibility in the power and thermal energy output.

For a Cheng Cycle to be implemented, a gas turbine and waste heat boiler or heat recovery steam generator (HRSG) is required.  The gas turbine is updated to accept "steam injection" - the steam being "superheated steam" which is capable of handling up to 20% of the exhaust flow from the gas turbine. The saturated steam as well as the superheated steam, is generated from the waste heat boiler or heat recovery steam generator. 

When the Cheng Cycle is in 100% power mode, all of the steam that is produced by the "waste heat" from the gas turbine, is "recycled" through the gas turbine.  In cogeneration plants, the Cheng Cycle system is set-up so that steam may be used for process application and-or recycled back to the gas turbine. A duct burner is placed between the gas turbine and the waste heat boiler or the heat recovery steam generator (HRSG) which increases the total amount of steam output generated by the plant.

The Cheng Cycle has achieved the following impressive performance metrics on a number of gas turbine generators:

• Increases the power output of the gas turbine by as much as 80% 

• Improves overall efficiency by 40% 

• With steam injection, can reduce NOx emissions by 90% - achieving 2 PPM 

• Reduces CO emissions to less than 10 PPM

Cheng Cycle
www.ChengCycle.com

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