碱性吸附剂对燃煤烟气中SO3的吸附特性

doi:10.16085/j.issn.1000-6613.2022-1621

化工进展 ›› 2023, Vol. 42 ›› Issue (7): 3855-3864.DOI: 10.16085/j.issn.1000-6613.2022-1621

碱性吸附剂对燃煤烟气中SO₃的吸附特性

张雪伟¹(), 黄亚继¹(), 许月阳², 程好强¹, 朱志成¹, 李金壘¹, 丁雪宇¹, 王圣², 张荣初³

^1.东南大学能源热转换及其过程测控教育部重点实验室，江苏南京 210096
^2.清洁高效燃煤发电与污染控制国家重点实验室，江苏南京 210023
^3.南京常荣声学股份有限公司，江苏南京 210018

收稿日期:2022-09-02 修回日期:2022-10-19 出版日期:2023-07-15 发布日期:2023-08-14
通讯作者: 黄亚继
作者简介:张雪伟（1999—），男，硕士研究生，研究方向为大气污染物控制。E-mail：2282779298@qq.com。
基金资助:
江苏省科技计划(BA2020001);清洁高效燃煤发电与污染控制国家重点实验室开放课题（1804）

Adsorption characteristics of SO₃ from coal flue gas by alkaline adsorbent

ZHANG Xuewei¹(), HUANG Yaji¹(), XU Yueyang², CHENG Haoqiang¹, ZHU Zhicheng¹, LI Jinlei¹, DING Xueyu¹, WANG Sheng², ZHANG Rongchu³

^1.Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, Jiangsu, China
^2.State Key Laboratory of Clean and Efficient Coal-fired Power Generation and Pollution Control, Nanjing 210023, Jiangsu, China
^3.Changrong Acoustic Limited Liability Company, Nanjing 210018, Jiangsu, China

Received:2022-09-02 Revised:2022-10-19 Online:2023-07-15 Published:2023-08-14
Contact: HUANG Yaji

摘要/Abstract

摘要：

炉膛内高温燃烧和选择性催化还原（SCR）催化剂产生的SO₃会严重损害设备和运行安全。本研究在模拟烟气条件下考察了Ca(OH)₂、Mg(OH)₂、NaHCO₃、NaHSO₃四种碱性吸附剂对SO₃的吸附性能，并研究了烟气气氛和温度对优选吸附剂的SO₃吸附能力的影响。采用热重分析研究了吸附剂的分解过程，对反应前后的吸附剂形貌结构特性进行了研究。结果表明：NaHCO₃和NaHSO₃两种吸附剂在中高温下都具有良好的吸附效果；NaHCO₃和NaHSO₃在自身分解和吸附SO₃的过程中释放气体产物而改善了吸附剂孔隙结构，提高了吸附剂对SO₃的吸附效果；烟气中的SO₂与SO₃在NaHCO₃上的吸附过程中存在竞争吸附，降低了NaHCO₃对SO₃的吸附效果；SO₂作为NaHSO₃吸附SO₃反应的产物，会抑制吸附剂对SO₃的吸附；SO₂抑制了NaHSO₃吸附SO₃的反应，导致NaHSO₃孔隙结构更加密集，对SO₃的吸附效果快速下降。本研究为烟道内喷射碱性吸附剂控制SO₃排放提供了一定的理论基础和参考。

关键词: 三氧化硫, 碱性吸附剂, 优选吸附剂, 吸附温度, 二氧化硫

Abstract:

The SO₃ produced by high temperature combustion and selective catalytic reduction (SCR) catalyst in the furnace can seriously damage equipment and operational safety. In this study, the SO₃ absorption performance of four alkaline adsorbents, Ca(OH)₂, Mg(OH)₂, NaHCO₃ and NaHSO₃, was investigated under simulated flue gas conditions. In addition, the effect of flue gas atmosphere and temperature on the SO₃ adsorption capacity of the preferred adsorbents was studied. The decomposition process of the adsorbent was analyzed using thermogravimetric analysis, and the morphological structural properties of the adsorbent before and after the reaction were compared. The results showed that both NaHCO₃ and NaHSO₃ adsorbents had good absorption effects at medium and high temperatures. NaHCO₃ and NaHSO₃ improved the pore structure of the adsorbent by releasing gas products during their own decomposition and SO₃ absorption, which improved the absorption effect of the adsorbent for SO₃. SO₂in the flue gas competed with SO₃ in the adsorption process on NaHCO₃ adsorption, reducing the absorption effect of NaHCO₃ for SO₃. SO₂ as a product of the reaction of NaHSO₃ for SO₃ absorption could be inhibited the absorption of SO₃ by the adsorbent. SO₂ as a reaction product of SO₃ absorption by NaHSO₃ would inhibit the absorption of SO₃ by the adsorbent. SO₂ inhibited the reaction of SO₃ absorption by NaHSO₃, resulting in a more dense pore structure of NaHSO₃ and a rapid decrease in the absorption effect for SO₃. This study provided some theoretical basis and reference for the control of SO₃ emissions by in-flue injection of alkaline sorbents.

Key words: sulfur trioxide, alkaline adsorbent, preferred adsorbent, adsorption temperature, sulfur drioxide

中图分类号:

X511

张雪伟, 黄亚继, 许月阳, 程好强, 朱志成, 李金壘, 丁雪宇, 王圣, 张荣初. 碱性吸附剂对燃煤烟气中SO₃的吸附特性[J]. 化工进展, 2023, 42(7): 3855-3864.

ZHANG Xuewei, HUANG Yaji, XU Yueyang, CHENG Haoqiang, ZHU Zhicheng, LI Jinlei, DING Xueyu, WANG Sheng, ZHANG Rongchu. Adsorption characteristics of SO₃ from coal flue gas by alkaline adsorbent[J]. Chemical Industry and Engineering Progress, 2023, 42(7): 3855-3864.

图/表 12

图1 SO3吸附实验系统1—N2储罐；2—O2储罐；3—SO2储罐；4—质量流量计；5—混气瓶；6—注射泵；7—水蒸气发生器；8—伴热带；9—砂芯挡板；10—吸附剂；11—双级立式管式炉；12—阀门；13—变色硅胶；14—烟气分析仪；15—蛇形冷凝管；16—恒温水浴锅；17—尾气处理

图2 吸附剂的热重分析

图3 320℃下不同吸附剂对SO3的吸附效率

图4 吸附SO3前后吸附剂的SEM图

图5 320℃下不同吸附剂对SO3吸附效果对比

表1 4种吸附剂320℃加热后的BET表征结果

参数	NaHCO₃	Na₂CO₃	NaHSO₃	Na₂SO₃
S_BET/m²·g^-1	2.261	1.102	8.733	1.801
V_p/cm³·g^-1	0.0112	0.00547	0.0838	0.00357

图6 吸附剂在不同温度下对SO3的吸附效果

图7 NaHCO3对烟气中SO x 的吸附效果

图8 SO2对NaHCO3吸附产物影响的SEM图

图9 烟气中SO2对NaHSO3吸附SO3的影响

图10 SO2对NaHSO3吸附产物影响的SEM图

表2 不同工况下NaHSO3的BET表征结果

参数	NaHSO₃-加热	NaHSO₃-SO₃	NaHSO₃-SO₂&SO₃
S_BET/m²·g^-1	8.7332	0.5718	0.3271
V_p/cm³·g^-1	0.083751	0.0011	0.000779

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碱性吸附剂对燃煤烟气中SO₃的吸附特性

Adsorption characteristics of SO₃ from coal flue gas by alkaline adsorbent

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