Sulfur Detection for Logistic Fuel-Based Fuel Cell Generators

This Phase II SBIR project aims to develop an infrared (IR) spectroscopic sulfur sensor to be used by the USAF on fuel cell-based, ground power generators using JP-8 fuel. This fuel grade typically contains 300-400 ppm sulfur, and removal of this contaminant is critical to efficient operation of the solid oxide fuel cell (SOFC). These generators need in-line sensors to monitor sulfur content at concentrations below 10 ppm. The objectives of the Phase II are to design, fabricate, test, and demonstrate a prototype sensor operating on a JP-8 fuel processor for SOFC. Phase I proved the feasibility of an innovative non-dispersive infrared spectroscopic (NDIR) method, employing a highly-compact, folded-path optical design, by selectively and accurately detecting test vapors under ambient conditions. Phase II will improve sensitivity and resolution to 1 ppm in de-sulfurized JP-8 process streams in the high temperature (400-600C) process environment. The prototype sensor, electronics and software will be delivered for testing on a prototype system at USAF facilities.