Energy consumption analysis of novel pyrolysis method of sewage sludge based on microwave-induced target-oriented heating

Chaoqian WANG; Wenlong WANG; Zhe LI; Jing SUN; Zhanlong SONG; Xiqiang ZHAO; Yanpeng MAO

doi:10.11949/j.issn.0438-1157.20181404

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Energy consumption analysis of novel pyrolysis method of sewage sludge based on microwave-induced target-oriented heating

更新时间：2020-06-24

- Energy consumption analysis of novel pyrolysis method of sewage sludge based on microwave-induced target-oriented heating
- CIESC Journal Issue S1, Pages: 168-176(2019)
- 作者机构：
  
  山东大学燃煤污染物减排国家工程实验室，山东省能源碳减排技术与资源化利用重点实验室，山东济南 250061
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20181404
  CLC： X 705;TM 25
- Received：23 November 2018，
  
  Revised：2018-12-23，
- 稿件说明：
移动端阅览
王超前, 王文龙, 李哲, 孙静, 宋占龙, 赵希强, 毛岩鹏. 基于微波诱导定向加热的污泥新型热解方法能耗分析[J]. 化工学报, 2019, 70(S1): 168-176

WANG Chaoqian, WANG Wenlong, LI Zhe, SUN Jing, SONG Zhanlong, ZHAO Xiqiang, MAO Yanpeng. Energy consumption analysis of novel pyrolysis method of sewage sludge based on microwave-induced target-oriented heating[J]. CIESC Journal, 2019, 70(S1): 168-176
王超前, 王文龙, 李哲, 孙静, 宋占龙, 赵希强, 毛岩鹏. 基于微波诱导定向加热的污泥新型热解方法能耗分析[J]. 化工学报, 2019, 70(S1): 168-176 DOI： 10.11949/j.issn.0438-1157.20181404.

WANG Chaoqian, WANG Wenlong, LI Zhe, SUN Jing, SONG Zhanlong, ZHAO Xiqiang, MAO Yanpeng. Energy consumption analysis of novel pyrolysis method of sewage sludge based on microwave-induced target-oriented heating[J]. CIESC Journal, 2019, 70(S1): 168-176 DOI： 10.11949/j.issn.0438-1157.20181404.

摘要

针对现有污泥热解技术耗时耗能、炭性能受限等难题，提出微波诱导协同热解的新型技术思路，即仅先用常规初级热解获得微波强化吸收的热解基体，再用微波诱导其高能位点效应，以期低能耗制备较高性能的污泥炭。对样品进行介电特性、工业分析等多种测试，在简要分析并验证该思路可行的基础上，探寻其能耗机制，以期为实际应用提供参考。结果表明，通过常规700℃热解10 min的热解基体，介电特性提高约22%，可在微波900 W中5 min升高到平均900℃；不仅提高炭性能，而且比常规700℃热解60 min节能省时达50%以上，这主要归因于对热解过程整体用时的显著缩减与微波能的高效利用。研究思路为低能耗制备高附加值污泥炭奠定工艺应用基础，有望实现污泥大规模资源化处置。

Abstract

There are many difficulties of current research on sewage sludge pyrolysis

such as time consuming

high energy consumption and limitation of char properties. To solve those difficulties

this paper provides a novel technical approach of microwave-induced synergistic pyrolysis. Namely without adding extra microwave absorbent

semi-pyrolytic sludge char can be obtained by pre-pyrolysis of sewage sludge itself under conventional low energy consumption; then it is used as basal body to be pyrolysed under microwave

which is based on

situ

carbonation enhancement by high-energy-site effects and heavy metal solidification

via

vitrification; finally

highly stable sludge char is expected to be produced with low energy consumption in the novel process. The paper tested the dielectric properties

proximate analysis

toxicity characteristic leaching procedure

specific surface area and SEM images of sewage sludge materials. By brief analysis and verification of feasibility of the novel approach

its energy consumption mechanism was focused on

which will contribute to practical application. In this experiment

semi-pyrolytic sludge char produced by pre-pyrolysis(700℃

10 min) could increase whole dielectric properties by 22%

that was conductive to achieve average 900℃ in 5 min under microwave pyrolysis (900 W). That was helpful for improving properties of sludge char

and the novel pyrolysis process saved up to 50% than the traditional one (700℃

60 min) . Energy saving property of the novel approach is mainly attributed to obviously shorten whole pyrolysis time and high efficiency utilization of microwave energy. This novel technical approach can complete the preparation of highly stable sludge char with low energy consumption

and will open a large-scale disposal route for sewage sludge.

关键词

Keywords

references

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