关键词: 错流旋转填料床, SCR脱硝技术, 氨脱除率, 氨氮废水

Abstract: At present, liquefied ammonia is mostly used as reducing agent in selective catalytic reduction (SCR) denitrification. But there are some safety problems such as high pressure storage and easy leakage of liquefied ammonia. The use of ammonia as reducing agent can effectively avoid such problems and the cost is low. In this work, the technology of ammonia stripping from ammonia water by high gravity was applied to SCR denitrification process (needs ammonia gas 5vol%~10vol%). Taking air?ammonia water as experimental system and rotating packed bed as ammonia blowing equipment. The effects of inlet temperature, high gravity factor and volume ratio of gas to liquid on blowing rate and ammonia production rate with two packings of stainless steel were investigated. The results showed that when the treatment gas was 4~10 m3/h, the blowing rate of the two packings was accelerated with inlet temperature, high gravity factor and volume ratio of gas to liquid increased. The inlet temperature and high gravity factor performed a positive effect on ammonia production rate while the volume ratio of gas to liquid showed a negative effect. The ammonia production rate was more than 10%. The high gravity ammonia water blowing technology could be used in SCR denitrification technology. When the treatment gas was 50?700 m3/h, the high concentration of ammonia nitrogen wastewater (1wt%) was stripped off, the ammonia production rate was at most 3.0%. Although it did not meet the SCR denitration requirements, but could combine the blown ammonia nitrogen wastewater with the ammonia stripping process to save ammonia consumption.

Key words: cross-flow rotating packed bed, SCR denitrification technology, rate of ammonia elimination, Ammonia nitrogen waste water