Demandbase Connect

April 1, 2011

Sendai Plant Boosts Efficiency and Cuts Emissions

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Pages: 1234

Located on the scenic Japanese coastline, Tohoku Electric Power Co., Inc.’s new 446-MW Sendai Thermal Power Station Unit 4 is a combined-cycle plant that replaces three 175-MW coal-fired units that had been in operation for more than 50 years. The new plant features the first application of MHI’s 50-Hz M701F4 gas turbine, which provides a thermal efficiency boost from the old plant’s 43% to more than 58%. This change substantially reduces CO2 emissions.


Courtesy: Tohoku Electric Power Co.

Sendai Thermal Power Station Unit 4 is situated near the Matsushima Prefectural Natural Park, which is considered one of the most picturesque spots in Japan. Matsushima Bay features approximately 250 pine-clad islands with trees twisted by wind and many unusual rock formations shaped by the force of ocean waves. Consequently, the Tohoku Electric Power Co. made it a top priority to design the new power plant building so that its architecture would harmonize with the natural beauty of its surroundings.

The new single-shaft combined-cycle plant began commercial operation in July 2010 and features the first application of Mitsubishi Heavy Industries’ (MHI’s) 50-Hz M701F4. It burns natural gas, which boosts the plant’s thermal efficiency from its previous 43% to more than 58%, according to Carlos Koeneke, vice president of project engineering for Mitsubishi Power Systems. The plant achieves an approximately 40% reduction in carbon dioxide (CO2) emissions by replacing coal with natural gas and attains an additional 20% CO2 reduction by increasing the thermal efficiency of the plant. The gas turbine provides 66% of the new plant’s combined-cycle power output; the steam turbine provides the balance.

“Special consideration was applied to the external appearance of the power plant building, which incorporates images of Japanese traditional architecture,” Koeneke said. “A white façade with tile roof design was applied. The final design required approval of the Japanese Government’s Agency of Cultural Affairs to be compatible with the surrounding of the Matsushima park, which has been designated a National Cultural Asset.”

The plant design team also minimized disruption of the natural landscape by reducing the number of stacks from the original three to one (as a result of replacing three units with one) and reduced the stack height from the original 120 meters (m, 393.7 feet) to 59 m. This change is especially noticeable when the plant is observed from the sea, according to Koeneke.

Pages: 1234


 

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