Effect of SO2 on adsorption of NO from sintering flue gas by modified activated carbon
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摘要: 为探究SO2对改性活性炭吸附法去除烧结烟气中NO效果的影响，减少NOx的排放，降低钢铁行业对环境的污染，采用碳酸钾（K2CO3）浸渍改性的方法制备了改性活性炭吸附剂，并考察了不同浓度SO2对改性活性炭吸附烧结烟气中NO的影响，及SO2对改性活性炭循环吸附脱附性能的影响。结果表明:SO2能够提高改性活性炭初始NO吸附速率，但显著降低NO的饱和吸附容量；SO2通过化学吸附方式占据活性位点，形成的亚硫酸盐及硫酸盐加热难以脱附，造成改性活性炭难以恢复初始吸附容量；SO2影响下改性活性炭吸附容量的衰减速率约为1.41417 mg/g，可以根据衰减速率，配合移动床吸附装置，选择合适的新鲜活性炭投入参数，进而指导改性活性炭吸附去除烧结烟气中NO的应用，有效降低环境污染，实现资源的高效利用。Abstract: In order to reduce NOx emission and alleviate the environmental pollution from steel industry, a modified activated carbon adsorbent was prepared by impregnation with potassium carbonate (K2CO3). The effect of SO2 concentration on the adsorption of NO in sintering flue gas by the modified activated carbon and the cyclic adsorption and desorption performance of the modified activated carbon were investigated. The results show that SO2 can improve the initial adsorption rate of NO but significantly reduce the saturated adsorption capacity of the modified activated carbon. SO2 occupies the active sites of the carbon by chemical adsorption, and the sulfites and sulfates formed are difficult to be desorbed by heating, resulting in difficulty of recovering the initial adsorption capacity of the modified activated carbon. Under the influence of SO2, the attenuation rate of the adsorption capacity of the modified activated carbon is about 1.414 17 mg/g. According to the attenuation rate and the moving bed adsorption device, appropriate input parameters of the fresh activated carbon can be adopted to guide the application of the modified activated carbon for removal of NO in the sintering flue gas, which can effectively reduce the environmental pollution and realize effficient utilization of resources.
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Key words:
- sintering /
- flue gas /
- nitric oxide /
- modified activated carbon /
- adsorption /
- sulfur dioxide
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图 1 试验装置示意
1—质量流量计；2—气瓶；3—恒温水浴锅；4—混气罐；5—温控仪； 6—固定床吸附柱；7—尾气处理装置；8—烟气分析仪
Figure 1. Schematic diagram of experimental apparatus
图 2 活性炭改性前后NO吸附速率变化曲线
Figure 2. NO adsorption rate curves of activated carbon before and after modification
图 3 不同SO2浓度下改性活性炭NO吸附速率变化曲线
Figure 3. Curves of NO adsorption rate by modified activated carbon at different SO2 concentrations
图 4 不同循环次数下改性活性炭NO吸附速率变化曲线
Figure 4. Curves of NO adsorption rate under different cycles by modified activated carbon
图 5 不同循环次数下改性活性炭NO吸附量拟合曲线
Figure 5. Fitting curve for adsorption capacity of NO under different cycles bymodified activated carbon
图 6 改性活性炭中毒前后XPS谱
Figure 6. XPS spectra of modified activated carbon before and after poisoning
表 1 不同SO2浓度下改性活性炭NO吸附容量及NO初始吸附速率
Table 1. Adsorption capacity and initial adsorption rate of NO by modified activated carbon at different SO2 concentrations
SO2浓度/
(mg·m−3)NO吸附量/
(mg·g−1)NO初始吸附速率/
(mg·min−1)0 16.576 0.412 30 13.078 0.494 70 10.193 0.485 715 7.589 0.471 
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表 2 不同循环次数下改性活性炭NO吸附容量
Table 2. Adsorption capacity of NO under different cycles by modified activated carbon
吸附次数 NO吸附量/(mg·g−1) 第一次 15.461 第二次 14.281 第三次 11.814 第四次 10.679 第五次 9.532 第六次 7.141 第七次 6.127 第八次 5.790 第九次 4.344
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