Development of a Turbocharger Booster System
In the natural gas industry a large portion of the engines used to compress the natural gas are lean burn engines. When these lean burn engines operate at low equivalence ratios, oxides of nitrogen (NOx) can be minimized. To operate at low equivalence ratios, these engines need a relatively high mass flow rate of air delivered to the intake manifold. One way to increase the mass flow rate of air to an engine is through the use of a turbocharger. The increased air mass flow rate, with a relatively constant fuel flow rate, reduces in cylinder combustion temperature which, in turn, reduces NOx formation. The downside is that the engine exhaust temperature is also lowered, which decreases the energy available to drive the turbocharger. Similarly, during the hottest days of the summer the density of air decreases which results in a lower air mass flow rate through the compressor and a lower trapped air mass inside the engine cylinder. The lower trapped air mass requires the engine to be de-rated, which reduced 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 that then increasesthe power produced by the turbine to drive the compressor, 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 on the NGMLÂ’s turbocharger test and research facility. 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. Additionally, the booster system was sustained by a small amount of fuel and air, which was removed from the compressor discharge piping. The cost for the amount of
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