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Kansas State University’s National Gas Machinery Lab and Innovative Environmental Solutions, Inc. are conducting a project through 2008 to characterize emissions performance for application of non-selective catalytic reduction (NSCR) technology to four-stroke cycle rich burn (4SRB) engines. BP of America, PRCI, API, the Department of Energy, and Enginuity are providing financial support for the project. Emissions will be monitored over an extended period to characterize the emission levels that can be consistently and reliably achieved, and NSCR operational requirements will be identified. Semi-continuous NOx and CO emissions monitoring systems have been installed on three engines in the Four- Corners area. The systems are installed on 4SRB engines of different makes, models and sizes that use NSCR to control emissions. In addition, ammonia emissions have been tested periodically to understand the emission tradeoff between NOx and ammonia. In addition to these three engines, other engines with NSCR are periodically monitored for NOx, CO and ammonia. Finally, NOx, CO and ammonia emissions were recorded in real-time using an extractive FTIR system, provided by El Paso Corporation, as an engine was operated at various controlled conditions over the course of a few days. All engines included in the study are used in natural gas production. This paper discusses project results to date on emissions characterization of NSCR-equipped natural gas production engines using semi-continuous monitoring. It also describes emissions tradeoffs between ammonia, NOx and CO for NSCR-equipped engines and discusses NSCR implementation and operation.
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