Combined low-temperature flue gas denitrification and desulfurization over the natural mineral blending modified activated coke

doi:10.11949/0438-1157.20201118

Abstract

Abstract:

In this paper, P1/Ti2-15@AC natural minerals are blended to modify activated coke to simulate the combined desulfurization and denitrification reaction process of activated coke in a moving bed reactor system. The results indicate that the low-temperature, highly efficient and low-cost flue gas desulfurization and denitrification process could be well combined by the natural mineral blending modified activated coke integrate thermal regeneration method. The NO conversion of the P1/Ti2-15@AC-Rn was improved significantly after the desulfurization-regeneration process. The P1/Ti2-15@AC-R1 and P1/Ti2-15@AC-R2 had almost 100.0% NO conversion, and it kept relative stable at 85.0% after the third regeneration cycles. The enhanced NO removal performance is mainly because the acidic C—O, C—S and other acidic functional groups on the surface of activated coke increase after desulfurization regeneration, which enhances the adsorption process of NH₃on the surface of activated coke during denitration, thereby improving the efficiency of denitration reaction.

Key words: catalyst, flue gas, activated coke, natural mineral, blending modification, combined denitrification and desulfurization

摘要：

以P1/Ti2-15@AC天然矿物共混改性活性焦，模拟研究移动床反应器系统中活性焦联合脱硫脱硝反应过程。研究结果表明，采用新型天然矿物共混改性活性焦，结合加热再生设计，可以很好地将烟气脱硫和脱硝过程结合，从而实现高效率、低成本的一体化联合脱硫脱硝。研究表明，循环脱硫再生后P1/Ti2-15@AC-Rn的脱硝活性得到显著提升，P1/Ti2-15@AC-R1和P1/Ti2-15@AC-R2的脱硝NO转化率接近100.0%，第三次再生后降低至85.0%左右并保持基本稳定。这主要是因为脱硫再生后活性焦表面酸性C—O、C—S等酸性官能团增加，增强了脱硝时活性焦表面NH₃的吸附过程，从而提升脱硝反应效率。

关键词: 催化剂, 烟道气, 活性焦, 天然矿物, 共混, 联合脱硫脱硝

CLC Number:

X 506

YANG Lin, MENG Xiaomi, YAO Lu, LAI Yuguo, JIANG Wenju. Combined low-temperature flue gas denitrification and desulfurization over the natural mineral blending modified activated coke[J]. CIESC Journal, 2021, 72(4): 2241-2248.

杨林, 孟小谜, 姚露, 赖雨果, 蒋文举. 天然矿物共混活性焦联合低温脱硫脱硝[J]. 化工学报, 2021, 72(4): 2241-2248.

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