Chemical Industry and Engineering Progress ›› 2023, Vol. 42 ›› Issue (7): 3855-3864.DOI: 10.16085/j.issn.1000-6613.2022-1621

• Resources and environmental engineering • Previous Articles     Next Articles

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. 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:2023-08-14 Published:2023-07-15
  • Contact: HUANG Yaji

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. 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
  • 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)

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. SO2 in 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

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

CLC Number: 

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