Mitsubishi Hitachi Power Systems has completed installation and commissioning of the gas-fired 880MW M701F4 combined cycle plant known as “Jawa-2 Project” at the Tanjung Priok Power Plant on Java Island.
Indonesia awarded a full turnkey engineering, procurement. construction (EPC) contract to MHPS, along with Mitsubishi Corporation and a local engineering and building firm, for construction and commissioning of the complete facility.
Equipment scope of supply for MHPS included two M701F4 gas turbine generators, two unfired exhaust heat recovery steam generators (HRSGs), single steam turbine generator and balance of plant (BOP) equipment.
The plant was developed on a “phased construction” schedule to install and make the gas turbines operational first, for simple cycle generation, while the more time-consuming installation of the steam cycle (HRSGs, steam turbine and associated equipment) was being carried out and completed.
Unit 1 gas turbine began limited simple cycle power generation in June of 2018, followed by Unit 2 one month later, site rated at nearly 300MW each. Now that the combined cycle plant has been built and commissioned, it is in full commercial service.
Interestingly, at the time of shipment in 2017, the M701F4 gas turbine was ISO rated at 324,3MW and 39.9% simple cycle unit efficiency (at 59°F ambient temperature) featuring an 18 to 1 pressure ratio compressor design, 1607 lb/sec mass flow and 1097°F exhaust temperature.
At 59°F ambient temperature, the 2×1 M701F4 combined cycle plant at Jawa 2 would normally be ISO rated at around 959MW and 60% net plant efficiency. Actually though, because monthly ambient temperatures average out at around 90°F, the Jawa-2 plant is site rated at 880MW.
The latest production model, more simply designated as an M701F with no suffix number, is ISO rated at 385MW and 41.9% efficiency. With a design that features a 21 to 1 pressure ratio compressor, 1650 lb/sec mass flow and1167°F exhaust.
The higher pressure ratio, mass flow and exhaust parameters makes a big difference. Compared to Jawa-2, the same 2×1 combined cycle plant layout designed around today’s M701F gas turbines would be ISO rated at 1,135MW net plant output and 62.2% net plant efficiency.