Comparison of Design and Operation Strategies for Temperature Control during Selective Catalytic Reduction of NOx

✍ Scribed by J. Jirát; F. Štěpánek; M. Marek; M. Kubíček

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 210 KB
• Volume: 24
• Category: Article
• ISSN: 0930-7516
• DOI: 10.1002/1521-4125(200101)24:1<35::aid-ceat35>3.0.co;2-z

✦ Synopsis

The problem of controlling temperature profile along a monolithic reactor in which an exothermic reaction (selective catalytic reduction of NO x by hydrocarbons) takes place is considered. Several solutions are proposed and compared. It is shown that a near-optimum temperature profile can be achieved by two rather different approaches ± one based on periodic switching of a hot reactant and a cold inert stream between two thermally coupled monoliths, and one based on pre-mixing the reactant and coolant streams. An adaptive control scheme based on model-predictive control is proposed and shown to be efficient for the case of time-variable properties of the reactant stream.