The simultaneous desulfurization and denitrification technology has been extensively studied for the advantages of low investment and compact structure. For the purpose of the foundation research of the mid-temperature multi-pollutant removal technology, the denitrification performance of the moderate temperature dry desulfurization system has been investigated on a pilot-scale circulating fluidized-bed reactor. The results indicate that simultaneous removal of NO could be achieved by injecting NH3 or urea into the desulfurization system, without affecting the SO2 removal performance. The appropriate temperature window for denitrification is 700~750℃(or above 780℃), and the maximum of the NO removal efficiency could be 52.3% (or 73.2%) when using NH3 (or urea) as the reductant. As byproducts, the generation of N2O and NO2 are not obvious, and the NH3 slip could be controlled by setting the bed temperature above a certain level.%同时脱硫脱硝技术具有结构紧凑、费用低的潜力,已得到广泛关注.为探索流化床对多污染物同时脱除的可行性,提出中温同时脱硫脱硝技术方案,并在中试规模的循环流化床实验台上进行了同时脱硫脱硝的实验研究.结果表明:通过在650～800℃的中温烟气干法脱硫系统中喷入还原剂NH3或尿素,可以实现同时脱硝.还原剂的加入对脱硫效果没有影响.使用NH3作为还原剂时脱硝的最佳温度区间为700～750℃,最高脱硝效率为52.3％；使用尿素时最佳温度区间为780～81 0℃,最高脱硝效率为73.2％.副产物N2O和NO2的生成不明显,出口NH3的逃逸可以通过提高床温进行控制.
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