超重力强化干法脱硝制氨工艺

将超重力法氨水吹脱制氨技术用于选择性催化还原(SCR)脱硝工艺(需氨5vol%~10vol%)，以空气?氨水为实验体系、旋转填料床为吹氨设备，考察了进气温度、超重力因子、气液体积比在装填不同填料时对脱氨率和产氨率的影响规律。结果表明，处理气量为4~10 m3/h时，丝网和乱堆两种不锈钢填料的吹脱率均随进气温度、超重力因子和气液体积比增大而增大；产氨率随进气温度和超重力因子增大而增大，随气液体积比增大而降低，产氨率达10%以上，与SCR法所需浓度一致，表明超重力氨水吹脱所制氨浓度可用于SCR脱硝。处理气量为50?700 m3/h时，吹脱浓度1wt%的氨氮废水，产氨率最大为3.0%。虽不满足SCR脱硝要求，但可将氨氮废水吹脱和氨水吹脱工艺相结合，节约氨水消耗量。

High gravity intensified dry denitrification process for ammonia production

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.