Model based tempering air control and enhancement of exhaust for select catalytic reduction

摘要

A method and system for controlling a temperature of an exhaust gas being introduced to a catalyst is provided. Using an adjustable flow controller, an adjustable amount of tempering fluid is provided to the exhaust gas prior to the exhaust gas proceeding to the catalyst. A sensor senses a parameter indicative of a temperature of the exhaust gas being introduced to the catalyst. A computer processor uses a relationship to relate the parameter to an adjustment of the adjustable flow controller that will adjust the amount of tempering fluid provided to the exhaust gas and change the temperature of the exhaust gas being introduced to the catalyst toward a target temperature. Adjustment of the adjustable flow controller is initiated by the computer processor to change the flow of the tempering fluid, and the relationship between the parameter and the adjustment of the adjustable flow controller is updated.

主权项

1. A method of controlling a temperature of an exhaust gas from a heat-producing device that is introduced to a catalyst of a catalytic system, the catalyst promoting a reaction to reduce an amount of a combustion product in the exhaust gas emitted to an ambient environment to a lesser amount than originally present in the exhaust gas when emitted from a combustion source of the heat-producing device, the method comprising:
providing, via at least one adjustable flow controller, an adjustable amount of a temperature tempering fluid to the exhaust gas prior to the exhaust gas being introduced to the catalyst so as to adjust the temperature of the exhaust gas prior to the exhaust gas being introduced to the catalyst, the exhaust gas to which the tempering fluid is provided being temperature-adjusted exhaust gas; sensing, via at least one sensor, at least one parameter indicative of temperature of the temperature-adjusted exhaust gas being introduced to the catalyst; using a fluid flow model and the at least one parameter to determine at least one adjustment of the at least one adjustable flow controller which adjusts the adjustable amount of the temperature tempering fluid provided to the exhaust gas and vary the adjustment of the temperature of the exhaust gas such that the temperature-adjusted exhaust gas has temperature adjustment toward a desired target temperature; performing the at least one adjustment of the at least one adjustable flow controller to adjust the adjustable amount of the temperature tempering fluid provided to the exhaust gas; and updating the fluid flow model using the at least one parameter and the determined at least one adjustment of the at least one adjustable flow controller.