Abstract
In this study, an internal gas combustion engine having a rated power output of lkW was experimentally studied fueled directly by ammonia. As a result, it was cleared that the gas engine was not driven by ammonia alone. However, it was driven by adding methane or hydrogen to ammonia at suitable concentrations so as to control combustion rate. The concentration of ammonia in the gas mixture should be less than 60 percent on the basis of total calorific value. During its stable working, it keeps rotating number at 1950 rpm. Besides, no ammonia contained in the exhaust gas for any stable conditions.