Urquhart Repowering Project, Beach Island, South Carolina
June 24, 2008 at 7:16 am | In Combined Cycle, Gas Turbine, Power Plant, Repowering | 1 CommentTags: Beach Island, Gas Turbine, GE, Mark IV, Retrofit, South Carolina, Urquhart Repowering Project
Owned and operated by South Carolina Electric & Gas Co.
For many utilities, repowering a 50-year-old coal-fired plant has become an attractive alternative to making expensive environmental upgrades to such a plant reaching the end of its useful life. Repowering is especially attractive if the plant’s existing water and air permits can be “recycled.” South Carolina Electric & Gas Co. was able to do just that at its Urquhart Station a few years ago. By repowering the plant’s older two units and cross-connecting them with Unit 3, the utility boosted Urquhart’s overall efficiency and operating flexibility. Creative engineers found a way to squeeze every dollar of savings from this plant.
Continue reading Urquhart Repowering Project, Beach Island, South Carolina…
Gas turbine combustors drive emissions toward nil
June 24, 2008 at 7:06 am | In Environmental, Gas Turbine, Low NOx, New Technology, Power Plant | 1 Comment| Best available control technology continues to be ratcheted down to achieve ever-lower NOx emissions. Some dry low-NOx combustors can achieve 9 ppm without post-combustion control, while newer catalytic combustors are operating below 5 ppm NOx. In the late 1980s, gas turbine original equipment manufacturers (OEMs) began to integrate dry low-NOx (DLN)—also referred to as dry low-emission (DLE)—combustion technology into their product lines to eliminate the need for steam or water injection, which had been the traditional method of NOx control. Many DLN technologies were evaluated, and lean premixed combustion emerged as the most promising approach for near-term application. Continue reading Gas turbine combustors drive emissions toward nil… |
Designing and modifying HRSGs for cycling operation
June 24, 2008 at 7:04 am | In Combined Cycle, Gas Turbine, Power Plant, Steam Turbine | Leave a CommentDesigning and operating HRSGs for cycling duty requires close cooperation between the manufacturer and the user. Once HRSGs are in service, a monitoring system should provide a thorough picture of the mechanisms affecting the life and integrity of the boiler.
Today’s heat-recovery steam generators (HRSGs), a vital component in the popular combined-cycle plant, are exposed to more severe duty than merely running at baseload. Deregulation has spurred the development of merchant plants, which are required to start up, load follow, and shut down with minimal notice in response to market conditions. Unless properly designed and operated to withstand this cycling duty, the integrity of the HRSG will be compromised.
Industry professionals need to understand the various damage mechanisms that can result, as well as how to control them. For new projects, damage control begins with the specification of certain design features. Operation and maintenance practices also play an essential role in managing HRSG life, both for new and existing plants. Existing plants also should explore modifications and monitoring programs that can boost the reliability and extend the service life of HRSGs in cycling duty.
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Oyster Creek Power 8, Freeport, Texas
June 23, 2008 at 1:05 am | In Combined Cycle, Environmental, Gas Turbine, Low NOx, Natural Gas, New Technology, Power Plant | Leave a CommentTags: Combined Cycle, Gas Turbine, low emission, Low NOx, Natural Gas
Operated and maintained by Dow Chemical Co., Freeport, Texas
Owned by Dynegy (50%) and American National Power (50%)
Sub-10 ppm NOx has been the dream of gas turbine users for many years, and currently there is only one OEM that can deliver on that promise. But OEMs are no longer the only suppliers of NOx retrofit hardware. Power Systems Manufacturing has developed a sub-5 ppm NOx retrofit kit for the GE 7EA that has taken dry low-NOx technology to the next level. Dow Chemical took a chance with the new technology and now operates the world’s cleanest—in terms of NOx—gas turbine.
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