| 摘要 |
A diesel engine (3) is equipped with a three-way catalytic thermal oxidizer (21), and a special manifold on the air intake to throttle and mix in air, natural gas, and cooled exhaust, to reduce nitrogen oxides emissions to extremely low levels. A computer (33) controls air flow to maintain stoichiometric fuel air ratio in the catalytic converter. Dual fueling with natural gas (1) in addition to diesel serves to reduce soot and also substitutes as a more economical fuel for the diesel it replaces. The cooled, recirculated exhaust (13) serves to reduce exhaust temperatures, reduce NOx generation, and prevent detonation within the engine. The three-way catalytic oxidizer (21) reduces NOx, CO, HC, and particulate emissions. |
