GE The New J920 Power Generation Gas Engine

The New J920

Pushing power generation gas engine technology to the next level, the J920 Jenbacher 9.5 MW system is GE’s most powerful unit for large engine power plants. Offering revolutionary design features such as the three modules concept, the J920 leads its class with a top electrical efficiency level of 48.7%.

Features

GE’s J920 Jenbacher gas engine is designed for durability, simple installation, and maintainability. The engine consists of three modules, including a generator, engine, and turbocharger auxiliary module, providing a high quality, pre-fabricated, standardized generator-set module. Each module is factory-tested, then shipped separately and assembled onsite, offering reduced installation time. In addition, the modules have highly standardized interfaces that work well with balance of plant (BOP) systems, and ultimately simplify BOP installations and total plant erection time.

To maximize plant availability, the J920 is optimized for operation and maintainability in the following ways:

• Power Unit

  The power unit ensures low maintenance downtime – the J920 power unit can be easily replaced without major disassembly of the engine.

• Divided Camshaft

  The J920 is equipped with a segmented camshaft to allow exchange through a maintenance window at the top of the crankcase.

• Coupling

  With the modular design, decoupling the units is a simple process – major engine parts stay in place and are easily accessible.

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  Combustion

  Based on GE’s type 6 gas engine combustion system, the J920 Jenbacher unit houses an advanced pre-chamber combustion system with spark ignition and optimal conditions for longer part life. In addition, the individual gas mixing achieved by port injection and cylinder-specic sensors allow each cylinder to operate at optimal performance. The J920’s mechanical structure is designed to allow high-peak ring pressure, achieving 48.7% effciency, the highest level of electrical effciency in its class.

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  2-stage turbocharging

  Compared to single-stage turbocharging, GE’s 2-stage turbocharging technology allows higher cooling water temperatures, making it an ideal fit for independent power production projects located in areas with hot ambient conditions. In particular, combined heat and power (CHP) applications benefit from using all mixture cooling heat at high temperatures. No deration at higher altitudes is another advantage.

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  Engine Management System

  The J920 is equipped with GE’s well-proven comprehensive Jenbacher gas engine management system with a programmable logic unit, handling plant and engine controls as well as visualization. To allow for smooth plant operation, the system specifically supports adaptive condition-based controls, individual cylinder balancing, optimization and protection of core controls, and limp home mode. Designed as part of the entire module system, with all core competencies in-house, every function is developed with a holistic point of view.

At the Top of its Class

When powering 18,500 European Union or 6,000 U.S. households with a single large gas engine, efficiency is critical. The J920 commands the highest electrical efficiency in its class, achieving an industry-leading 48.7% in electrical efficiency. The J920’s performance data speaks volumes.

Key Performance Data

Performance Data	J920(50Hz/1,000 rpm)	J920(60Hz/900 rpm)
Electrical Output	9,500 kW	8,550 kW
Electrical Efficiency	48.7%	48.7%
Heat Rate	7,392 kJ/kWh 7,006 BTU/kWh	7,392 kJ/kWh 7,006 BTU/kWh
Thermal Output	8,100 kWth	7,300 kWth
Total Efficiency	90%	90%

Output and efficiency at generator terminals. ISO 3046. Nat. Gas MN >80, Power Factor 1.0, 500 mg/Nm3 (@ 5% O2).NOx, Efficiency at LHV.

Installed Dimensions

	Lengths	Width	Height	Weight
Engine	8.4m 27.5 ft	2.9m 9.5 ft	3.3m 10.8 ft	87 t 174,000 lb
Generator	5.2m 17.1 ft	2.5m 8.2 ft	2.9m 9.5 ft	54 t 108,000 lb
TCA Module	3m 9.8 ft	6.4m 21.3 ft	3.4m 11.2 ft	36 t 79,000 l