超声强化脱除模拟烟气中NO的研究

采用NO和N2的混合气模拟烟气,用酸性尿素溶液作吸收液还原吸收模拟烟气中NO,考察了NO浓度、进气量、尿素浓度、pH值及温度对NO脱除效率的影响,并且在超声环境下进行了NO脱除实验的研究。实验结果表明:当NO含量为3 300 mg/m3,进气量为300 mL/min时,尿素质量分数为10%,pH值为3.00,常压50℃下,NO脱除率最高,可达到86.84%。超声对尿素吸收NO具有一定的强化作用,使用5 kW超声功率,此时NO脱除率提高到89.13%。

Enhancing Nitric Oxide Removel from Simulated Flue Gas with Ultrasound

A mixture of N2 and NO was used as the simulated flue gas, and removal of NO with using the acid urea solution as the sorbent was studied. Investigated the effects of concentration of NO,gas flow rate,concentration of absorbent, pH value of absorption solution, temperature of absorption solution on removal rate. NO removel experiment was conducted in ultrasonic environment. The results showed that the removal rate of NO could reach 86.84 % under the optimum condition as follows： the temperature was 50 %, the NO initial concentration was 3 300 mg/m3, the gas flow rate was 300 mL/min, the urea mass fraction was 10 %, the pH was 3.00. The ultrasonic played certain role in promoting the absorption process. The experiment indicated that when the ultrasonic power was 5 kW, the removel rate of NO could reach 89.13%.