Combined-cycle Plants Services for Electric Power


Combined-cycle plants produce electric power from natural gas combustion. This is done by superim posing two different thermal cycles: Bryton cycle, associated to direct combustion in a gas turbine, and Rankine cycle, associated to water vapor. This way it is possible to take advantage of the hot gasses that escape the gas turbine cycle to provide the power needed to operate the related vapor cycle.

Electricity is generated in two different thermal machines (gas and vapor turbines) from just one primary fuel (natural gas). This cycle superposition allows combined-cycle plants to have a higher energetic efficiency thanks to all the electricity generation technologies, which may lead to 55% higher performances.

Since the mid 90s, combined-cycle plants have experienced a significant grow in the world’s energetic mix due to their competitive advantages over other fossil technologies, some of them being investment costs for each installed power unit, high efficiency and low emissions. Moreover, their power is dense according to the occupied ground and makes the plant more flexible and easier to manage, adapting it to the market’s necessities.

Combined-cycle plants are still going to play a decisive role in the international energetic mix. In emerging countries they are replacing obsolete fossil generation technologies, less efficient and not very environmental friendly, to guarantee a safe supply. They act as renewable energy back-ups and secondary-tertiary regulation tools at the system operator’s service, changing their original concept of base charge operation.

The services provided by Deenma in this area are those needed to analyze the viability and monitor both theproject and the EPC integral development. This includes technical support, construction monitoring and tests with assistance during operation.

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