In the natural gas industry a large portion of the engines used for compression are lean-burn engines. When these engines operate at low equivalence ratios, oxides of nitrogen (NOX) can be minimized. The lean-burn engines are turbocharged to deliver high air flow to the engine. However, varying ambient temperatures alter the mass flow rate of air delivered to the engine, changing the equivalence ratio the engine fires at. This may cause an engine to be de-rated, or taken off line reducing the gas throughput. This problem can be partially offset by the installation of a turbocharger booster system to increase the available energy at the turbocharger turbine inlet. One method to boost the energy available to drive the turbocharger is to increase the temperature of the exhaust before it enters the turbine via a relatively small dry low NOX burner. A turbocharger booster system was designed, prototyped, installed, and tested at the National Gas Machinery Laboratory (NGML) turbocharger test and research facility (TTRF). The test data show that the addition of a turbocharger booster system increased the speed of the turbocharger without increasing the emission levels. The increase in speed translates to an increased pressure ratio and mass flow rate of air produced by the compressor. By controlling the booster system, constant air flow rate can be achieved regardless of ambient conditions. This paper provides test results that show how the system can be used to increase an engine’s operating range and mitigate ambient effects.

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