Patent ID: 6854266
Filing Date: 2005-02-15
Classification: F01N,F02D

Abstract:
1. A method of desulfurization of a storage medium for at least one of nitrogen oxides and sulfur oxides situated in a gas stream, comprising: recording a measuring signal using an oxygen probe situated downstream from the storage medium in a direction of flow of the gas stream; using a plotted curve of the measuring signal over time to determine a loading of the storage medium with sulfur oxides, wherein desulfurization is initiated as a function of the plotted curve; establishing a mixture having a low oxygen concentration in the gas stream at predetermined intervals for determining the loading of the storage medium; and using a change in the measuring signal of the oxygen probe as a measure of a need for desulfurization of the storage medium after establishing the mixture having the low oxygen concentration in the gas stream; wherein a difference between a first measuring signal of the oxygen probe upon initial establishment of the mixture having the low oxygen concentration and a second measuring signal at an end of establishment of the mixture having the low oxygen concentration in the gas stream is used as a measure of the loading of the storage medium with sulfur oxides, and wherein a desulfurization of the storage medium is initiated when an absolute value of the difference drops below a predetermined value.