Effects of Impinging Particle-Laden Gas Jets on the Potential for Burnout in an MHD Radiant Boiler

摘要

The potential burnout of the backwall of the radiant boiler by a high temperature particle-laden impinging jet has been analyzed for both CFFF and retrofit sized MHD plants. The analysis indicates that the decay of gas velocity and temperature will be negligible as a result of the short distance between the diffuser outlet and the backwall. It is concluded that, based on the present CFFF and retrofit radiant boiler design, the backwall will be susceptible to burnout because of the high temperature of the gas entering the radiant boiler. This high diffuser exit gas temperature does not have sufficient distance to cool down before impinging on the backwall. If the particle loading is higher and/or the refractory melting temperature is lower than assumed, the potential burnout problem becomes even more severe. The formation of a slag layer on the refractory surface will mitigate the burnout problem if the slag layer can form in the region of high jet velocity. However, because of the molten form of the slag layer which may be easily blown away, this improvement could be small. 6 refs., 11 figs. (ERA citation 11:047825)