煤炭工程 ›› 2024, Vol. 56 ›› Issue (2): 178-185.doi: 10.11799/ce202402026

• 研究探讨 • 上一篇    下一篇

掺配废PVC对水煤浆成浆性能及燃烧性能的影响

李懂,李寒旭,焦发存,等   

  1. 1. 安徽理工大学
    2. 安徽理工大学化学工程学院
  • 收稿日期:2023-06-07 修回日期:2023-09-08 出版日期:2024-02-20 发布日期:2024-02-29
  • 通讯作者: 李寒旭 E-mail:hxli@aust.edu.cn

Effect of waste PVC addition on performance of coal water slurry and their combustion properties

  • Received:2023-06-07 Revised:2023-09-08 Online:2024-02-20 Published:2024-02-29

摘要: 为缓解废PVC 处理压力, 回收碳氢资源, 将废PVC 与煤粉混合制备废PVC-煤浆, 分析掺配废PVC 后浆体的定黏质量分数、流变特性及稳定性。利用SEM-EDX 和分形理论对掺配废PVC 的浆体表观形貌和分形维数进行分析, 探讨掺配废PVC 对煤浆性能的影响机理。利用热重分析法和Coats-Redfern 积分法计算原煤浆及废PVC-煤浆的燃烧特性指数和动力学参数, 对不同废PVC 掺配量浆体的燃烧性能进行评价。结果表明: 掺配废PVC 可以提高浆体的成浆性但析水率升高、稳定性有所下降; 废PVC 的掺配量越多, 浆体的分形维数越小, 成浆浓度越高; 掺配废PVC 对煤浆燃烧会产生协同作用, 当废PVC 的添加量为3%和5%时, 煤浆的燃尽率和综合燃烧性能变好, 促进燃烧反应, 添加量为8%和10%时抑制燃烧反应; 在选取Coats-Redfern 近似时, 水煤浆燃烧在选取反应级数n =1 时线性相关性最高, 掺配5%的废PVC 后的浆体表观活化能和频率因子最大。

关键词: 废PVC, 成浆性能, 燃烧性能, 热分析, 动力学分析, 塑料回收

Abstract: In order to relieve the pressure of waste PVC treatment and recover hydrocarbon resources, the waste PVC was added to pulverized coal to prepare waste PVC-coal slurry. The morphorlogy and specific surface area of the prepared waste PVC-coal slurry were determined using SEM-EDX and BET, repectively. The influencing mehcainnsms of the added PVC in slurry performance were investigated. The combustion characteristic index and kinetic parameters of raw coal slurry and waste PVC-coal slurry were evaluated by thermoweight analysis method and Coats-Redfern integration method. The results show that the waste PVC can improve the slurry concentration but reduce the stability. Addition of the waste PVC exhibits a synergistic effect on coal slurry combustion. When the amount of waste PVC added is 5%, the positive synergistic effect is the strongest, the burnout rate of coal slurry is the largest, the comprehensive combustion performance is the best, and the apparent activation energy is the largest.

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