化工进展 ›› 2022, Vol. 41 ›› Issue (4): 2150-2160.DOI: 10.16085/j.issn.1000-6613.2021-0810

• 资源与环境化工 • 上一篇    下一篇

NTP-DBD气化城市污泥及其模型化合物: 气氛对产物分布及特性的影响

王思怡(), 李月慧, 葛玉洁, 王焕然, 赵璐璐, 李先春()   

  1. 辽宁科技大学化学工程学院,辽宁 鞍山 114051
  • 收稿日期:2021-04-16 修回日期:2021-05-22 出版日期:2022-04-23 发布日期:2022-04-25
  • 通讯作者: 李先春
  • 作者简介:王思怡(1987—),女,博士研究生,研究方向为固体废弃物处理技术与理论。E-mail:13029372008@126.com
  • 基金资助:
    国家自然科学基金(U1910215)

Gasification of sewage sludge and its model compounds with NTP-DBD: effect of atmosphere on product distribution and properties

WANG Siyi(), LI Yuehui, GE Yujie, WANG Huanran, ZHAO Lulu, LI Xianchun()   

  1. School of Chemical Engineering, University of Science and Technology Liaoning, Anshan 114051, Liaoning, China
  • Received:2021-04-16 Revised:2021-05-22 Online:2022-04-23 Published:2022-04-25
  • Contact: LI Xianchun

摘要:

城市污泥制备高品质合成燃气,是减小环境污染、提高废弃物附加值、实现能源化利用的有效方法之一。本文采用介质阻挡放电低温等离子体(NTP-DBD)技术,利用热重-质谱联用(GT-MS)对城市污泥及其模型化合物亮氨酸、葡萄糖的气化特性进行了研究。重点考察了反应气氛、放电频率对合成气体分布情况的影响,并利用傅里叶变换红外光谱(FTIR)、扫描电镜(SEM)对固体产物结构进行了表征。结果表明,在Ar气氛下,较热重热解污泥,NTP-DBD气化污泥产生合成气的浓度提升了1.84%。放电频率由10.5kHz调至9.2kHz时,输出电压提高了36%,并且污泥气化效率提高了5倍;当工作气氛为CO2时,气化效率占污泥挥发分含量的74.86%。相较于葡萄糖而言,模型化合物亮氨酸气化产生的H2、CO、CO2、CH4较多,说明污泥中蛋白质对污泥气化的气体产物贡献较大。与传统热解气化结果相比,NTP-DBD气化技术能够有效提高合成气产量、降低高温操作难度且避免污泥气化过程中二英等剧毒类物质产生。

关键词: 污泥, 低温等离子体, 模型化合物, 气化, 废物处理, 热解

Abstract:

The production of high-quality synthetic gas from municipal sludge turns out to be an effective solution in terms of lower environment pollution, higher added value of waste and realizing energy utilization. By using dielectric barrier discharge non-thermal plasma (NTP-DBD) technology, urban sludge and its model compounds, i.e. leucine and glucose, were gasified. The effects of different atmospheres and discharge frequencies on gas generation characteristics were studied. The solid products were subjected to Fourier infrared (FTIR), scanning electron microscope (SEM) for characterization. The results showed that the syngas concentration produced by NTP-DBD gasification sludge was increased by 1.84% compared with that of thermal gravimetric wastewater in Ar. When the discharge frequency was adjusted from 10.5kHz to 9.2kHz, the output voltage was increased by 36%, and the sludge gasification rate was increased by 5 times. When the ambient gas was CO2, the gasification efficiency accounted for 74.86% of the volatile content of the sludge. Leucine gasification produced more H2, CO, CO2 and CH4, indicating that the protein in the sludge contributes more to the gas products of sludge gasification. Compared with the performance of ordinary pyrolysis, the NTP gasification technology can not only effectively increase syngas capacity, but also ease high temperature operation and avoid the formation of highly toxic substances such as dioxins during sludge gasification.

Key words: sewage sludge, non-thermal plasma, model compound, gasification, waste treatment, pyrolysis

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