Mitsubishi M501D Series Gas Turbine

Independent gas turbine output

110 MW class

Combined cycle output

170 MW class/340 MW class/510 MW class

Fuel Diversity

Blast furnace gas (BFG) compatible

Gas turbine for 60 Hz power generation compatible with fuel diversity

In 1984. a 1.090 MW heat recovery combined cycle power plant powered by six 701D gas turbines began commercial operation.

This was the dawn of the current era of combined cycle power generation. the DA Series incorporates F-Class technology into the D Series to improve overall performance.

Features

Integral Design

The gas turbine units are based on a basic structure adopted in the early 1970s that has accumulated a track record of at least 40 years. Its main features are listed below:

Compressor shaft end drive reduces the effect of thermal expansion on alignment

Rotor with simple single-shaft double bearing support

Rotor construction with bolted discs, torque pins in the compressor section and CURVIC couplings in the turbine section to ensure stable torque transmission

Axial flow exhaust structure for advantages in combined cycle plant layouts

Horizontally split housing for on-site removal of the blades with the rotor in place

Compressors

The DA series utilizes high-efficiency compressors with a proven track record. The fixed vanes of the backstage are supported by vane rings to minimize tip clearance of the rotating vanes.

Variable inlet guide vanes ensure operational stability at start-up and enhance performance under partial loads in combined cycle operation.

Combustion chamber

Mitsubishi Power introduced the world's first commercially available dry low NOx combustor to the D-Series gas turbine in 1984.

The premixed low NOx combustor consists of a pilot burner and eight main burners surrounding it. The combustion chamber has an air bypass mechanism to adjust the fuel-air ratio in the combustion zone.

Turbine

In response to the increase in turbine inlet temperature, the fixed blades of the first three stages and the rotor blades of the first two stages are air-cooled.

The rotor blades of the fourth stage are equipped with Z-shaped shrouds to enhance the vibration strength of the blades.

The fixed blades are supported by blade rings that are independent of each stage to protect the turbine housing from thermal expansion.