A Dry Process for Simultaneous Removal of SO2 and NO from Flue Gas of Power Plants by Using a Gas-Solid-Solid Fluidized Bed
气-固-固流化床用于燃煤电厂尾气同时脱硫脱硝

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.