Abstract
<div class="section abstract"><div class="htmlview paragraph">Southwest Research Institute (SwRI) utilizes the burner-based Exhaust Composition Transient Operation Laboratory<sup>TM</sup> (ECTO-Lab) to accurately simulate transient engines and replicate real exhaust that is produced by light and heavy-duty engines for aftertreatment aging and evaluations. This system can generate and dose NO<sub>X</sub> over transient cycles from a range of 20 ppm to 1200 ppm where the NO<sub>X</sub> is generated by the in-situ decomposition and combustion of a fuel-bound, nitrogen containing compound. During the combustion and decomposition of the nitrogen containing compound over 95 % of the NO<sub>X</sub> generated is in the form of NO. To authentically simulate exhaust gases, it is necessary to account for the distribution of the NO to the NO<sub>2</sub>. Since previous work has established that the decomposition of nitric acid can be utilized as a method to generate NO<sub>2</sub>, the objective of this project was to develop control of NO and NO<sub>2</sub> within SwRI’s ECTO-Lab through the decomposition of nitric acid. In addition to this, a system was built capable of generating NO<sub>2</sub> and NO independently of the ECTO-Lab via nitric acid decomposition. It was determined that NO<sub>2</sub>:NO<sub>X</sub> control can be achieved by varying the proprietary fuel-bound, nitrogen containing compound flow rate and nitric acid flow rate. Total NO<sub>X</sub> control was approximately ± 20 ppm when total NO<sub>X</sub> was 1000 ppm, and the gas phase HNO<sub>3</sub> concentration was maintained below 3 ppm for all operating points. The maximum NO<sub>2</sub>:NO<sub>X</sub> ratio achieved was 90 %, and the minimum was 2%. This proves that when utilizing the HNO<sub>3</sub> decomposition system, the ECTO-Lab systems have the capability of controlling the NO<sub>2</sub>:NO<sub>X</sub> distribution at steady-state.</div></div>
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