Abstract
The performance of a cathode air preheater with internal off-gas oxidation is presented. It is a plate heat exchanger, handling both injection and oxidation of depleted anode gas in the hot cathode flow. The gas mixture oxidizes in the heat exchanger, and the reaction heat is used to preheat cathode air. We describe a system consisting of a close coupled injector and a catalytically coated plate heat exchanger. The performance was constrained by reaction kinetics: the off-gas and cathode mixture ignites within 5 – 10 ms at mixture temperatures above 750°C, causing overheating of the exchanger walls. The integrated component consists of an internal injector, which delivers the anode gas to each cathode flow path between pairs of heat exchanging plates. The injection occurs adjacent to a catalytically coated zone in the heat exchanger. The CFD effort covers the combined effects of injection, mixing, generation of reaction heat and heat exchange.
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