选择性非催化脱硝反应等温过程的实验研究

Experimental Study on Isothermal SNCR Process of NO_x Removal

为促进工程中选择性非催化法脱硝系统的优化,有效控制燃煤电厂NO_x排放量,通过建立完善的选择性非催化脱硝(SNCR)反应等温实验系统,研究了反应温度、混合时间和O_2体积分数对SNCR过程的影响.结果表明:在973~1 373K内,随反应温度的升高,脱硝效率先升高后下降,1 173K为最佳脱硝温度,此时脱硝效率达到92.9%;混合时间缩短可有效提高脱硝效率,特别是当温度高于1 203K时,随着混合时间的缩短,脱硝效率明显提高;O_2体积分数的增加在温度低于1 148K时促使脱硝效率升高,而在温度高于1 148K时会导致脱硝效率降低.

To optimize the NOx removal system by selective non-catalytic reduction （SNCR） and to control the NOx emission in power plants, an isothermal SNCR experimental setup was established to study the effects of following factors on the SNCR process, such as the reaction temperature, mixing time and O2 concentration, etc. Results show that, in the temperature range of 973-1 373 K, with the rise of reaction temperature, the NOx removal efficiency first increases and then decreases, and the optimum denitrification temperature is 1 173 K, when the removal efficiency could reach 92.9%. The efficiency of NOx removal can be effectively improved by reducing the mixing time, especially when the temperature is higher than 1 203 K. The efficiency of NOx removal increases with rising O2 concentration at the temperature lower than 1 148 K, while decreases at the temperature higher than 1 148 K.