CIESC Journal ›› 2021, Vol. 72 ›› Issue (4): 2132-2138.DOI: 10.11949/0438-1157.20200899

• Separation engineering • Previous Articles     Next Articles

A new adsorption process for flue gas NOx purification and recovery

YOU Yang1(),LIU Yingshu1,YANG Xiong1,WU Xiaoyong1,ZHAO Chunyu1,WANG Zheng1,HOU Huanyu2,LI Ziyi1()   

  1. 1.School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
    2.HBIS Technology Research Institute, Shijiazhuang 050023, Hebei, China
  • Received:2020-07-06 Revised:2020-10-23 Online:2021-04-05 Published:2021-04-05
  • Contact: LI Ziyi

面向烟气NOx净化与回收的新型吸附工艺

游洋1(),刘应书1,杨雄1,吴晓永1,赵春雨1,王正1,侯环宇2,李子宜1()   

  1. 1.北京科技大学能源与环境工程学院,北京 100083
    2.河钢集团钢研总院,河北 石家庄 050023
  • 通讯作者: 李子宜
  • 作者简介:游洋(1995—),男,硕士研究生,1143746504@qq.com
  • 基金资助:
    “十三五”国家重点研发专项(2017YFC0210302);国家自然科学基金项目(21808012);中央高校基本科研业务费专项资金(FRF-IDRY-19-025)

Abstract:

Reasonable and efficient adsorption process is the key process link that determines the industrial feasibility of the adsorption method to purify and recover NOx in flue gas. In this paper, a novel adsorption process (GVTSA) with NOx desorption using multiple hot gas circulations (GC) within the enclosed fixed bed through extra gas replenishment was proposed. Based on Na-ZSM-5 zeolites as sorbents, experimental studies on NOx adsorption and recycling from desulfurized iron-ore sintering flue gas of a steel plant were conducted. The results show that the GVTSA obtained a higher NOx recovery compared with traditional adsorption processes (e.g. TSA, VSA), reaching 90% under the optimal conditions (220℃, -50 kPa). The concentration of desorbed NO2 was more than 2%, significantly enhanced from merely 36 mg·m-3 in the feed gas. The NOx cyclic adsorption capacity reached 0.10 mmol·g-1 for up to 16 cycles. This work can provide references for industrial engineering application of flue gas ultra-low emission control and resource utilization.

Key words: flue gas purification, nitrogen oxide, adsorption, recovery, regeneration

摘要:

合理高效的吸附工艺是决定吸附法净化和回收烟气中NOx工业可行性的关键工艺环节。提出一种通过外部补充气体实现固定床循环体空间内多次循环解吸NOx的新型吸附工艺(GVTSA)。基于该工艺,采用Na-ZSM-5分子筛作为吸附剂,以某钢厂烧结机脱硫后烟气为原料(组分)进行了NOx吸附回收实验研究。结果表明,GVTSA工艺相较传统吸附工艺(TSA工艺、VSA工艺)可获取更高的NOx回收量,在优选条件下(220℃,-50 kPa),NOx回收率达到90%,解吸气中NO2浓度由原料气的36 mg·m-3提升到2%以上,NOx循环吸附量可达0.10 mmol·g-1,16次吸脱附循环稳定。研究结果可为烟气NOx治理与资源化工业应用提供参考。

关键词: 烟气净化, 氮氧化物, 吸附(作用), 回收, 再生

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