化工进展 ›› 2021, Vol. 40 ›› Issue (1): 526-533.DOI: 10.16085/j.issn.1000-6613.2020-0416

• 资源与环境化工 • 上一篇    下一篇

CO2辅助好氧菌煤炭脱硫工艺的实验

王瑞1(), 刘自勇2, 王琪3, 彭翠娜1, 陈中合1, 李福利2, 王晓龙3, 杨成1()   

  1. 1.济南大学化学化工学院,山东 济南 250022
    2.中国科学院青岛生物能源与过程研究所生物燃料重点实验室,山东 青岛 266101
    3.中国华能集团清洁能源技术研究院有限公司煤基清洁能源国家重点实验室,北京 102209
  • 收稿日期:2020-03-19 出版日期:2021-01-05 发布日期:2021-01-12
  • 通讯作者: 杨成
  • 作者简介:王瑞(1995—),女,硕士研究生,研究方向为煤炭生物脱硫。E-mail:wangr223@126.com
  • 基金资助:
    山东省自然科学基金委与山东省科学院联合基金(ZR2016YL010)

Experimental on CO2-assisted aerobic-bacteria coal desulfurization process

Rui WANG1(), Ziyong LIU2, Qi WANG3, Cuina PENG1, Zhonghe CHEN1, Fuli LI2, Xiaolong WANG3, Cheng YANG1()   

  1. 1.School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, Shandong, China
    2.Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Science, Qingdao 266101, Shandong, China
    3.State Key Laboratory of Coal-based Clean Energy, Huaneng Clean Energy Research Institute, Beijing 102209, China
  • Received:2020-03-19 Online:2021-01-05 Published:2021-01-12
  • Contact: Cheng YANG

摘要:

生物脱硫技术具有环境和过程友好等特点,在煤炭脱硫领域具有重要的应用开发前景。本文主要研究了嗜酸氧化亚铁硫杆菌(Acidithiobacillus ferrooxidans)和嗜酸氧化硫硫杆菌(Acidithiobacillus thiooxidans)混合菌群对高硫煤生物的脱硫工艺,分别考察了空气氧化环境、CO2辅助气氛下的脱硫效果。实验结果表明,A. ferrooxidansA. thiooxidans混合菌群在空气氧化环境下具有良好的脱硫能力,两种嗜酸好氧菌表现出一定的协同作用,无机硫脱除率可达70%;而CO2辅助能够显著提高有氧条件下菌群的脱硫效率,无机硫脱除率可达90%以上。通过扫描电镜(SEM)、红外光谱(FTIR)、X射线衍射(XRD)、X射线光电子能谱技术(XPS)等表征手段对脱硫后的煤炭结构变化和发酵脱硫机制进行研究,引入的CO2一方面为两种好氧菌在发酵条件下提供碳源,促使菌群快速生长增殖;另一方面部分CO2溶于水使发酵溶液中碳酸根离子浓度发生改变,实现降低发酵脱硫产物黄钾铁矾在煤粒表面的沉积密度,促进生物脱硫过程的进行。

关键词: 生物脱硫, 氧化亚铁硫杆菌, 氧化硫硫杆菌, 二氧化碳, 混合共培养,

Abstract:

Biodesulfurization technology is environmentally and process-friendly, which has important application and development prospect in the field of coal desulfurization. This paper studied the biological desulfurization process of high sulfur coal by the mixed flora of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans, and examined the desulfurization effects under air oxidation environment and CO2 auxiliary atmosphere. The results showed that the mixed flora of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans had good desulphurization ability in air oxidation environment, the two aerobic eosinophilic bacteria showed certain synergistic effect, and the inorganic sulfur removal rate reached 70%. However, CO2-assisted atmosphere significantly improved the desulfurization efficiency of bacteria under aerobic (air oxidation environment) conditions, which increased the removal rate of inorganic sulfur by 20%, and the removal rate of inorganic sulfur reached more than 90%. SEM, FTIR, XRD, XPS and other characterization methods were used to study the structural changes of coal desulfurization. It was speculated that the introduced CO2 provided sufficient carbon source for the growth of the two bacteria, which promoted the rapid growth and proliferation of the two bacteria. At the same time, the solution ion concentration changed due to the CO2 dissolved in water, which reduced the adsorption density of jarosite precipitation on the surface of coal particles, and promoted the process of biodesulfurization.

Key words: biological desulfurization, Acidithiobacillus thiooxidans, Acidithiobacillus thiooxidans, carbon dioxide, mixed co-culture, coal

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