Optimization of a heat-integrated exhaust catalyst for CNG engines

Heat‐Integrated Exhaust Purification for Natural Gas Engines

“…As briefly shown in [5] CH 4 concentrations of ∼ 2500 ppm were sufficient to maintain the catalyst temperature at the defined setpoint. Pressurized air, which was dosed with a mass flow controller and heated with a high-throughput electric heater, was used as base flow.…”

“…The most important characteristic para-meter is the so-called amplification factor a F [7,5], which is defined as the ratio between maximum temperature rise DT max in the heat-integrated reactor and the adiabatic temperature rise DT ad , by the exothermic reaction on the catalyst. The most important characteristic para-meter is the so-called amplification factor a F [7,5], which is defined as the ratio between maximum temperature rise DT max in the heat-integrated reactor and the adiabatic temperature rise DT ad , by the exothermic reaction on the catalyst.…”

“…In order to increase the temperature level of the exhaust catalyst, a heat-integrated reactor concept based on a metal-lic countercurrent heat exchanger with TWC-coated walls was introduced in [5]. In Fig.…”

“…1 was developed [5,6], which is schematically depicted in Fig. 1 was developed [5,6], which is schematically depicted in Fig.…”

“…For the flap operating strategy, a very simple binary approach was found to be appropriate with the position changing from fully opened to fully closed after the initial heating period [5]. Similarly, the heater was assumed to operate at full power as long as the flap is opened.…”