CIESC Journal ›› 2022, Vol. 73 ›› Issue (11): 5211-5219.DOI: 10.11949/0438-1157.20220848

• Special column for Thermalchemical conversion of biomass and organic solid wastes • Previous Articles     Next Articles

Migration of sulfur and nitrogen during co-hydrothermal carbonization process of sewage sludge and high-sulfur coal

Xiaoyang YANG(), Baofeng WANG(), Xutao SONG, Fengling YANG, Fangqin CHENG   

  1. Institute of Resources and Environment Engineering, Shanxi University, Engineering Research Center of CO2 Emission Reduction and Resource Utilization-Ministry of Education of the People’s Republic of China, Taiyuan 030006, Shanxi, China
  • Received:2022-06-17 Revised:2022-09-12 Online:2022-12-06 Published:2022-11-05
  • Contact: Baofeng WANG

污泥与高硫煤共水热碳化过程中硫氮形态转化规律

杨晓阳(), 王宝凤(), 宋旭涛, 杨凤玲, 程芳琴   

  1. 山西大学资源与环境工程研究所,教育部CO2减排与资源利用工程研究中心,山西 太原 030006
  • 通讯作者: 王宝凤
  • 作者简介:杨晓阳(1995—),男,博士研究生,yllskk@163.com
  • 基金资助:
    国家自然科学基金项目(22178204);山西省区域合作项目(202104041101029)

Abstract:

Co-hydrothermal carbonization experiments of sewage sludge and high-sulfur coal were carried out using a high temperature and high pressure reactor. The results showed that protein nitrogen (N-A) of sewage sludge was converted into heterocyclic nitrogen after hydrothermal treatment, and pyrrole (N-5) and pyridine oxynitride (N-X) of high sulfur coal were converted into pyridine (N-6) and quaternary nitrogen (N-Q). The sulfur of sewage sludge and high sulfur coal were converted into thiophene and sulfate. The increase in the proportion of nitrogen-containing aromatic heterocycles (e.g., N-6, N-5, and N-Q) in the hydrochar was attributed to the increase of the proportion of high-sulfur coal blends and temperature. Furthermore, the thiophene content of hydrochar increased to 22.61% and 24.98% gradually with increasing of high-sulfur coal blending ratio and temperature; and the sulfate content increased at higher temperature, however it decreased when increasing proportion of high-sulfur coal blend ratio. This study could provide the theoretical basis for the clean utilization of sewage sludge and high-sulfur coal efficiently.

Key words: sewage sludge, high-sulfur coal, co-hydrothermal carbonization, hydrochar, sulfur and nitrogen elements, occurrence form

摘要:

采用高温高压反应釜进行了污泥(SS)和高硫煤(CS)的共水热碳化实验。分别考察了混合比和温度对水热炭中硫氮元素形态转化规律的影响。研究结果表明,经过水热处理后,SS中蛋白质氮(N-A)转化为杂环类氮,CS中吡咯氮(N-5)和吡啶氮氧化物(N-X)转化为吡啶氮(N-6)和季氮(N-Q);SS与CS中硫元素逐渐转化为噻吩硫和硫酸盐。随着CS混合比例和温度的升高,水热炭中含氮芳族杂环(例如N-6、N-5和N-Q)占比增加。另外,随着CS混合比例和温度升高,水热炭中噻吩硫含量分别逐渐增加至22.61%和24.98%;升高温度提高了水热炭中硫酸盐含量,而增加CS混合比例却降低了硫酸盐含量。本研究可为后续SS和CS的资源化清洁利用提供理论基础。

关键词: 污泥, 高硫煤, 共水热碳化, 水热炭, 硫氮元素, 赋存形态

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