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过程工程学报 ›› 2021, Vol. 21 ›› Issue (1): 108-115.DOI: 10.12034/j.issn.1009-606X.219375

• 环境与能源 • 上一篇    下一篇

安徽临涣矿区烟煤与生活污泥共燃的燃烧特性与动力学特征

夏紫薇1,2, 郑刘根1,2*, 周春财3, 魏祥平4, 董祥林4   

  1. 1. 安徽大学资源与环境工程学院,安徽 合肥 230601 2. 安徽省矿山生态修复工程实验室,安徽 合肥 230601 3. 合肥工业大学资源与环境工程学院,安徽 合肥 230009 4. 淮北矿业(集团)有限责任公司通防地测部,安徽 淮北 235000
  • 收稿日期:2019-12-23 修回日期:2020-03-30 出版日期:2021-01-22 发布日期:2021-01-21
  • 通讯作者: 郑刘根
  • 基金资助:
    MgCl26H2O-Mg(OH)2-MgO技术路线制备高纯镁砂过程基础研究;安徽省交通航务工程有限公司科技开发项目;淮北矿业集团有限责任公司科技项目

Combustion characteristics and kinetics during co-combustion of bituminous coal in Linhuan Mining Area, Anhui Province and municipal sludge

Ziwei XIA1,2, Liugen ZHENG1,2*, Chuncai ZHOU3, Xiangping WEI4, Xianglin DONG4   

  1. 1. School of Resource and Environment Engineering, Anhui University, Hefei, Anhui 230601, China 2. Anhui Province Engineering Laboratory for Mine Ecological Remediation, Hefei, Anhui 230601, China 3. School of Resource and Environment Engineering, Hefei University of Technology, Hefei, Anhui 230009, China 4. Geological Survey Division, Huaibei Coal Mining Group Corporation, Huaibei, Anhui 235000, China
  • Received:2019-12-23 Revised:2020-03-30 Online:2021-01-22 Published:2021-01-21

摘要: 以安徽淮北临涣工业园燃煤电厂煤样品和生活污水处理厂污泥样品为研究对象,采用热重分析法(TGA)对不同混合质量比条件下的煤与污泥进行了共燃实验,同时通过五种反应动力学模型研究了不同燃烧阶段煤、污泥样品共燃的动力学特征,揭示了煤和污泥的燃烧特性。研究结果表明,煤在529℃出现一个失重峰,污泥分别在140, 293和430℃出现三个失重峰,表明污泥的燃烧过程分为三个失重阶段,而煤只有一个失重阶段。煤的可燃性指数与综合燃烧特性指数为11.36×10–6 mg/(K–2•min), 47.16×10–10 K–3•min–2,与煤相比,污泥的可燃性指数与综合燃烧特性指数较低,分别为10.74×10–6 mg/(K–2•min), 13.04×10–10 K–3•min–2。在煤中添加污泥可以提高反应的燃烧特性,混合质量比以90(煤):10(污泥)为宜。随升温速率升高,煤与污泥的失重减少,燃烧失重速率增加,DTG曲线向高温区移动,产生热滞后现象。在固定碳燃尽阶段,混合燃料的活化能均位于两种原料之间,并且随污泥添加量增加而降低,表明污泥的添加有效提高了煤的反应活性并促进其燃烧过程。

关键词: 煤, 污泥, 共燃, 燃烧特性, 动力学

Abstract: Coal samples from coal-fired power plants and sludge samples from domestic sewage treatment plant were collected in Linhuan Industrial Park in Huaibei, Anhui Province. The co-combustion experiments of coal and sludge under different mixing ratios were carried out by thermogravimetric analysis (TGA). The kinetics analysis of the mainly weightlessness stage of fuel was studied by five reaction kinetics models, and the combustion characteristics of coal and sludge were revealed. Results showed that the coal sample had one weight loss peak at the temperature of 529℃ while sludge had three ones at the temperature of 140, 293 and 430℃, indicated that the combustion process of sludge was divided into three stages of weightlessness while coal only had one stage of weightlessness. The flammability index and combustion characteristics index of coal were 11.36×10–6 mg/(K–2•min) and 47.1610–10 K–3•min–2. Compared with coal, the flammability index and combustion characteristics index of sludge were lower, 10.74×10–6 mg/(K–2•min) and 13.04×10–10 K–3•min–2, respectively. The combustion characteristics of the reaction was increased by adding sludge to coal, and the mixing ratio was preferably 90 (coal): 10 (sludge). As the heating rate increases, the weight loss of coal and sludge decreases, and the burning weight loss rate increases. The DTG curves of all samples were shifted to the high temperature side, resulting in thermal hysteresis. During the fixed carbon burnout phase, the activation energy of the blended fuel was between the two kinds of raw materials, and decreased with the addition of sludge, which proved that the addition of sludge can effectively improve the reactivity of coal and promote its combustion process.

Key words: coal, sludge, co-combustion, combustion characteristic, kinetics