气-固-固流化床用于燃煤电厂尾气同时脱硫脱硝

采用新型干法气–固–固流化床反应器进行模拟燃煤电厂尾气的高效同时脱硫、脱硝. 在内径53 mm的流化床中，以砂粒作为固相介质、自制的K2CO3/Al2O3为吸附剂，考察了温度、吸附剂粒径、吸附剂活性组份(K)与气相中污染组份(SO2，NO)的摩尔比、模拟气中SO2/NO摩尔比等工艺条件对脱硫脱硝效率的影响. 在无氨条件下同时脱硫、脱硝的效率可分别达到100%和92%. 大量数据表明，尾气中的SO2对吸附剂表面NO的脱除反应有显著促进作用.

A Dry Process for Simultaneous Removal of SO2 and NO from Flue Gas of Power Plants by Using a Gas-Solid-Solid Fluidized Bed

A novel dry gassolidsolid fluidized bed process was adopted for simultaneous high removal of SO2 and NO from flue gas of power plants combusting coal. The fine sorbent employed was porous alumina particles coated with potassium carbonate. Under different operation temperatures, the fine sorbent was continuously fed into a fluidized bed of silica sand where sorption reaction between the sorbent particles and model flue gas took place. Removal efficiencies of SO2 and NO were compared under different operation parameters including bed temperature, sorbent kind and size, mole ratios of potassium over SO2 and/or NO. The regeneration of alumina carrier were also investigated. It was found that 100% of SO2 and 92% of NO can be removed simultaneously with no ammonia injection under the typical temperature range of flue gas before entering stacks in a power plant. A great amount of data showed a strong beneficial effect of SO2 in the flue gas on NO removal. Porous alumina carrier can be effectively regenerated with distilled water for repeated sorbent preparation and further use in reaction.