GAS ENGINES
M501J model gas
turbine
November 7th, 2016: Iberdrola inaugurated Dulces Nombres II, a 300MW combined cycle power plant (CCGT) next to the city of Monterrey, in the State of Nuevo León, designed to cover the power demand of the region's flourishing industrial sector in Mexico.
his state-of-the-art gas combined cycle plant, which required an invest- ment of US$250 million, will cover the increased electricity demand of the industrial sector in Nuevo León, one of Mexico's largest and fastest growing industrial areas.
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With this project, Iberdrola consolidates its position as the country's largest private power producer with an installed capacity of nearly 6,000 MW and US$4 billion in cumulative investment. Also, the company is building 10 new power generation plants in Mexico, between gas-fired units and renewable energy projects, which total an additional 4,000 MW and represent an investment effort of US$3 billion, with the aim of bringing installed capacity to 10,000 MW by 2020. As a result of this strong commitment, Mexico will become Iberdrola's largest electricity generation hub in 2019, overtaking its energy production in Spain.
Featuring latest technology advances, the Dulces Nombres II is designed to run more efficiently, with greater availability, reduced maintenance needs and improved environ- mental performance.
Iberdrola CEO and Chairman Ignacio Galán told American Power News: “This strong investment program is our contribution to the intense development & transformation process on which Mexico has embarked, aimed at supporting the transition towards a de-carbonized model that enhances the
economy's competitiveness for the ultimate benefit of the people of Mexico and their quality of life.”
Iberdrola said that the new power plant increases its electricity generation capacity to 6GW in the country.
Iberdrola earlier received a contract to build 850MW Noreste combined cycle plant by 2018 in Mexico. Power generated from the facility will be sold to the Mexican Federal Electricity Commission (CFE) under 25-year power purchase agreement. The Noroeste plant will feature Mitsubishi
Hitachi Power Systems (MHPS)-built M501J model gas turbines.
The J-series gas turbine is able to operate at a turbine inlet temperature of 1,600°C, 100°C higher than the G-series gas turbine by utilizing advanced 1,700°C class technology developed in the Japanese National Project. The turbine features a number of key developments:
•The compressor shaft end drive reduces
the effect of thermal expansion on alignment •The rotor has a two-bearing structure to support the compressor and turbine ends •The rotor structure has bolt-connected discs with the torque pins in the compressor rotor, and discs with CURVIC couplings in the turbine rotor to ensure reliable torque transmission
•An axial flow exhaust structure is used to optimize the combined-cycle plant layout •Horizontally split casings that facilitate field
“This strong investment program is our contribution to the intense development & transformation process on which Mexico has embarked,”
Ignacio Galán Iberdrola CEO and Chairman
removal of the blades with the rotor in place. The latest 3D advanced design techniques have been used to improve the performance and reduce the shockwave loss in the initial stages and frictional loss in the intermediate and final stages of the turbine, reports MHPS. In addition to variable inlet guide vanes used to modulate air flow, the J-series gas turbine is equipped with three variable vanes at the front stages of the compressor. The four stages operate together to modulate the gas turbine air flow in order to maintain relatively high exhaust temperatures (at part load) for improved bottoming cycle efficiency. The J-series combustor was based on the proven steam cooling system used in G-series gas turbines.
The turbine inlet temperature of 1,600°C is 100°C higher than the G-series. MHPS says it is able to maintain emissions to match levels equivalent to the G-series. This is accomplished through the use of low-NOx technologies including optimization of the local flame temperature in the combustion zone, and by improving the combustion nozzle to produce a more homogeneous mixture of fuel and air.
The advanced JAC-series with the air cooled combustors adds operational flexibility by eliminating any need for steam cooling from the bottoming cycle. The metal temperature is maintained at the same level of G-series by utilizing the 1,700°C class technology developed in the Japanese National Project. The 100°C temperature increase from G-series to J-series is offset in part due to the advanced thermal barrier
coating (TBC).
www.iberdrola.com
16 NOVEMBER 2016 AMERICAN POWER NEWS
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