Abstract
Chemically Recuperated Gas Turbine (CRGT) is an advanced GT cycle that can increase power generation efficiency by recovering the exhaust heat with endothermic reaction of steam reforming. The CRGT fueled by Dimethyl Ether (DME) was demonstrated using 30kW Micro GT (MGT) as a project funded by METI from 2003 to 2007 and accomplished both 10% reduction of fuel consumption compared with steam injected GT cycle, which is similar proven technology, and NO_x emission level of less than 10ppm. Alternative fuel nozzle had concentric double pipe, one of which was designed to burn DME directly with diffusive combustion, and the other was premixed combustion of low-BTU reformed gas. The reformer, which was designed to fit into the MGT and consisted of 96 SS316-tubes filled with Pt catalyst and alumina balls, top and bottom headers and rectangular duct, recovered 15.3kW heat from exhaust gas and increase fuel heating value by 7.9%. This report provides not only these results but also a lot of useful information including concise specification, designing process and verification test of each mechanical and electrical component, and relevant issues and solutions as well.
