化工学报 ›› 2023, Vol. 74 ›› Issue (7): 3018-3027.DOI: 10.11949/0438-1157.20230367

• 能源和环境工程 • 上一篇    下一篇

CaO调质含油污泥干燥特性及数学模型

刘春雨1(), 周桓宇1, 马跃1,2, 岳长涛1,2()   

  1. 1.中国石油大学重质油国家重点实验室,北京 102249
    2.中国石油大学油气光学探测技术实验室,北京 102249
  • 收稿日期:2023-04-12 修回日期:2023-06-12 出版日期:2023-07-05 发布日期:2023-08-31
  • 通讯作者: 岳长涛
  • 作者简介:刘春雨(1990—),女,博士研究生,liuchunyu_lcy@126.com
  • 基金资助:
    国家重点研发计划“固废资源化”重点专项(2019YFC1906300)

Drying characteristics and mathematical model of CaO-conditioned oil sludge

Chunyu LIU1(), Huanyu ZHOU1, Yue MA1,2, Changtao YUE1,2()   

  1. 1.State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
    2.Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum, Beijing 102249, China
  • Received:2023-04-12 Revised:2023-06-12 Online:2023-07-05 Published:2023-08-31
  • Contact: Changtao YUE

摘要:

热干化技术是一种污泥预处理技术,为提高干燥效率,降低能耗,向含油污泥中添加CaO,观察微观结构变化,分析温度和添加剂CaO对含油污泥干燥特性的影响,建立CaO调质含油污泥的干燥模型。结果表明:添加的CaO集中于含油污泥孔隙结构内,使含油污泥孔道结构增加,水分更容易从孔道中析出;水分蒸发主要集中在快干阶段,干燥温度100℃能最大限度保留CaO调质含油污泥中有机物质;添加CaO后总干燥时间显著降低,CaO最佳添加比例为10%~12%;Page模型可用于描述CaO调质含油污泥干燥过程,通过Fick第二定律得到有效水分扩散系数Deff为0.9581×10-8~3.3395×10-8 m2/s,在CaO含量10%时达到最大;综合考虑含油污泥干燥速率和经济效益,干燥温度100~120℃,CaO添加量10%~12%是CaO调质含油污泥干燥的最佳条件。

关键词: 含油污泥, 干燥, 氧化钙, 显微结构, 模型

Abstract:

Thermal drying technology is one of sludge pretreatment technologies. To improve drying efficiency and reduce energy consumption, CaO was added to the oil sludge, and the microstructural changes were observed. The effects of temperature and CaO on oil sludge drying characteristics were analyzed, and the drying model of CaO-conditioned oil sludge was established. The results show that the added CaO is concentrated within the pore structure of oil sludge and increases the pore space, so moisture evaporates more easily from the pore channels. The evaporation of water is mainly concentrated in the fast drying stage, and drying at 100℃ retains the most organic matter in CaO-conditioned oil sludge. CaO shows facilitating effects on the drying process, reduces the total drying time significantly, and the optimal CaO addition ratio is 10%—12%. Page model can be used to describe the CaO-conditioned oil sludge drying process, and the effective moisture diffusion coefficient Deff obtained by Fick's second law varies from 0.9581×10-8 m2/s to 3.3395×10-8 m2/s. The Deff reaches the maximum when the CaO content is 10%. Considering the drying rate and economic benefit, the optimum drying conditions of oil sludge are at 100—120℃ and adding 10%—12% CaO.

Key words: oil sludge, drying, calcium oxide, microstructure, model

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