Electricity & Power

Siemens Gas Turbines upgraded with Wet Compression prove a game changer

WetCMore power generated at a lower cost per kilowatt, takes on demanding Middle East Summer.
Wet compression (WetC) is a means of upgrading gas turbines by injecting water into the air intake. This technique offers increased turbine power output and efficiency. WetC is particularly well-suited to hot climates, where summer demand for electricity often peaks at the warmest time of day.

With WetC operators can react quickly to electricity demand spikes using its “push-button” power boost capability. This type of operational flexibility lets operators conduct grid load balancing, and even leverage revenues from high peak/high priced load times. In terms of sustainability and efficiency, WetC reduces nitrogen oxide (NOx) emissions while increasing mass flow throughout the turbine. These factors make WetC ideal for the demands of the power infrastructure in the Middle East, as well as support the regions’ strategy for sustainable development.

How it works

In very basic terms, water is used to cool the compressor, which makes the turbine run more efficiently during hot weather. A set of nozzles in the air inlet near the compressor entrance inject micro fine droplets of de-mineralized water into the air inlet flow.  The water is supplied by a frequency driven high pressure pump (portable), which can be used to upgrade new or existing gas turbine plants.

WetC is a very cost-effective upgrade, proven to improve the performance of gas turbine plants. Power output improvements of up to 30 megawatts (MW) in a simple-cycle operation are documented, as well as an increase in combined cycle power due to the increased exhaust energy.

WetC in the Middle East

Since the first pilot project with Dubai Electricity and Water Authority (DEWA) at the Jebel Ali G-station in 2004, WetC have been successfully operating in further power stations of DEWA, helping easily meet the peak demand in hot summer months.

The technology also features in Egypt’s power generation portfolio in the Nubaria, Talkha and Kureimat power stations and other countries in the Middle East. By using wet compression, each turbine can generate 15% additional electricity while reducing NOx emission by 15%.

“Significant year-on-year increases in power demand in the UAE and across the Middle East highlight the importance of energy efficiency as a priority when planning new and upgraded infrastructure,” said Dietmar Siersdorfer, CEO, Siemens Middle East and UAE.

“We have the technology to make significant improvements to the way power is generated and used, and this is our focus – energy efficiency at every stage in the electricity value chain.”

(Source: Siemens AG – The Energy Blog)

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