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HOME > Products > Energy > MHI Gas Turbine Technology > No.7 Design features of the M701G2 gas turbine
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No.7 Design features of the M701G2 gas turbine

M501G rotor
The M701G2 gas turbine's unit rotor is of bolted construction with a positive torque incorporating such features as radial pins and curvic couplings, respectively. The rotor is supported by two-element tilting pad bearings and an upper-half fixed bearing. The thrust bearing is a double-acting type that uses the leading-edge groove lubrication system.
The air inlet system, which contains a silencer, delivers air to the compressor via a plenum bell mouth and houses the inlet, main journal and thrust bearings.
There are four stages in the turbine so as to maintain moderate aerodynamic loadings even at the increased firing temperature and pressure ratio, as in the case of all Mitsubishi large frame industrial gas turbines.
The combustion system consists of a 20-can-annular combustor with almost the same diameter and length as the M501G (the 60Hz version), which has 16 such combustors. The low NOx hybrid combustor design is an improvement over the current highly successful design that has been in commercial operation in the M501F/M701F fleet for natural gas and liquid fuel firing. The transition piece is cooled by steam through a double-wall structure for more uniform cooling effectiveness. The presence or absence of flame and the uniformity of fuel flow distribution across the combustors are monitored by thermocouples located downstream of the last stage turbine blades. These can also detect combustor malfunctions when at load, while the ultraviolet detectors are used to sense ignition during the initial starting phase.
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