Exhaust gas mixer, system, and method of using

An exhaust gas system for treating an exhaust gas from an exhaust gas source, comprising:

• an exhaust gas mixer disposed within a conduit downstream of a urea water solution (UWS) injector system, and upstream of a selective catalytic reduction (SCR) catalyst, an electronic controller configured to direct power to at least one element of the mixer, and in electronic communication with one or more sensors and/or control modules;
• the exhaust gas mixer comprising a plurality of elements configured to be disposed within a conduit downstream of a urea water solution injector within an exhaust gas flowpath, the plurality of elements located between a mixer inlet through which an exhaust gas and a reductant flow into the exhaust gas mixer, and a mixer outlet through which the exhaust gas and the reductant flow out of the exhaust gas mixer, at least one of the elements being heatable by an external power source independent of another of the plurality of elements,
• wherein the plurality of elements are arranged within the exhaust gas flowpath such that no line of sight exists between the mixer inlet and the mixer outlet, and
• wherein the controller is configured to increase or decrease a temperature of the one or more elements independent of the other elements to optimize SCR catalytic reduction of NOx present in the exhaust gas flowing therethrough to nitrogen and water downstream of the SCR catalyst, based on one or more inputs from the one or more sensors and/or control modules.