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摘要
The dual effects of waste heat recovery and flue gas denitrification was obtained by coating Vanadium SCR catalysts of medium temperature (V2O5-WO3/TiO2) on honeycomb regenerators, however, the denitrification performance of Vanadium catalysts is unsatisfactory in the low temperature zone approaching flue gas outlet. Novel Copper-based SCR catalysts of nano porous structure (5%CuO-40% HPW/Popcarbon) were reported to work efficiently under the condition of low temperature. In the current work, to obtain better heat transfer and denitrification performances, the novel Copper-based SCR catalysts are applied to the low-temperature surface of honeycomb regenerators coated with Vanadium catalysts, and expansion and contraction channels are employed to strengthen the heat and mass transfer rates in composite regenerators. With the secondary development of Fluent software, the numerical model of novel composite SCR honeycomb regenerators is established, where the SCR denitrification of flue gas in porous catalyst layers is coupled with the unsteady conjugate heat transfer with air and flue gas flowing through regenerators alternately. With the current model, the effects of catalyst coating scheme and structural parameters on the thermal and denitrification performances are explored for the novel composite regenerators. Numerical results show that the composite SCR honeycomb regenerators with an expansion and contraction angle of 15° can generate a good overall performance, whose energy recovery ratio (ERR) and denitrification efficiency (η) are 10.1% (58.2% vs 48.1%) and 26.7% (92.4% vs 65.7%) higher than those of straight-channel regenerators coated with a single Vanadium-based catalyst, respectively. The results of this study can provide a reference for energy saving and reducing nitrogen oxide (NOx) emissions in industrial boilers. ? 2023 Science Press.
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