摘要
CaCO3影响选择性非催化还原法脱硝性能。文中采用固定床反应器,结合傅里叶变换红外光谱气体分析仪测量气体组分,研究了温度(650～850℃)、NH3浓度(100×10-6～1500×10-6)和O2浓度(0～4%)对CaCO3催化NH3氧化反应的影响。研究结果表明,CaCO3对NH3氧化反应有催化作用。NH3催化氧化反应的转化率和产物NO的选择性随NH3浓度增加而下降,随温度的增加而增加。生成NO和N2的途径与NH3在CaCO3表面的覆盖度分别成一次关系和二次关系。O2组分对CaCO3作用下NH3转化的速控步影响较小,主要是促进了产物NO选择性的增加。CO2对CaCO3催化NH3氧化反应有微弱抑制作用,CO对CaCO3催化NH3氧化反应没有影响。
CaCO3 influence selective non-catalytic reduction （SNCR） performance. This paper studied the influence of CaCO3 on NH3 oxidation. Experiments were carried out in a fixed bed reactor. Influences of temperature （650-850 ℃）, NH3 concentration （100 × 10-6-1 500 ×10-6） and 02 concentration （0-4%） on NH3 catalytic oxidation were studied. Fourier transform infrared spectroscopy （FTIR） was used to test NH3 and NO concentrations. It was proved that CaCO3 could catalyze NH3 oxidation. NH3 conversion and NO selectivity would decrease when NH3 concentration increases and increases when temperature increases. The reactivity for NO generation and N2 generation are first order and second order to NH3 coverage on CaCO3 separately. The 02 concentration has little effect on NH3 conversion but has NO selectivity increases. CO2 could inhibit NO generation. CO has no effect on NH3 oxidation. KEY WORDS： CaCO3; NH3 oxidation; conversion; selectivity; selective non-catalytic reduction （SNCR）
出处
《中国电机工程学报》
EI
CSCD
北大核心
2011年第35期35-40,共6页
Proceedings of the CSEE
