M501J/JAC Series

Overview

The M501J/JAC Series are large-capacity gas turbines designed for 60 Hz power generation with an ISO base rating of 453 MW and a simple cycle efficiency of 44.0 %LHV (LHV heat rate 8,182 kJ/kWh; 7,755 Btu/kWh). Combined cycle performance for the M501JAC is listed as 1 on 1 plant output 664 MW with plant efficiency ＞64.0 %LHV and 2 on 1 plant output 1,332 MW with plant efficiency ＞64.2 %LHV. The M501JAC configuration includes a 15-stage compressor, 16-can combustor, air-cooled cooling method, a 4-stage turbine, a single rotor, cold end output shaft, rated speed 3,600 rpm, approximate dimensions L × W × H 15.0 × 5.6 × 5.6 m, and approximate weight 347 ton. Key design and component features documented for the series include: a compressor using advanced three-dimensional design techniques with inlet guide vanes and variable stationary vanes at the first three stages; a combustor based on the steam cooling system proven with the G Series, an improved fuel nozzle, and (for the JAC) air-cooled combustors that eliminate the need for steam cooling from the bottoming cycle; a turbine inlet temperature 100°C higher than the G Series together with high-performance cooling technologies and advanced thermal barrier coating to maintain blade metal temperatures; a simple single-shaft two-bearing rotor with bolt-connected discs, torque pins in the compressor section and CURVIC couplings in the turbine section; an axial flow exhaust structure and horizontally split casings that facilitate field removal of blades with the rotor in place. Simple cycle exhaust and operational parameters include exhaust flow 815 kg/s (1,685 lb/s), exhaust temperature 649 °C (1,193 °F), exhaust emissions NOx 25 ppm@15%O2 and CO 9 ppm@15%O2, turn down load 50 %, ramp rate 42 MW/min, and starting time 30 minutes. The product is presented explicitly for 60 Hz power generation in gas turbine combined cycle (GTCC) plants and simple cycle operation, including single-shaft 1 on 1 and 2 on 1 configurations with the stated plant outputs and efficiencies. The series supports hydrogen co-firing, with 30% hydrogen co-firing demonstrated and the capability described to convert existing GTCC plants to hydrogen co-firing and potentially to 100% hydrogen combustion with minimal modifications; this capability is described alongside a stated reduction in CO2 emissions of approximately 65% compared to conventional coal-fired power plants. Lifecycle and operational support offerings for these gas turbines include Long Term Service Agreements (LTSA), TOMONI® intelligent solutions, comprehensive operation and maintenance support, repair services to extend equipment life, and training programs for plant operators and maintenance engineers; steam turbine services for GTCC combined-cycle plants are also listed.