污泥冻融循环过程中的脱水性能及基于COMSOL Multiphysics的水热耦合分析

郭子瑞; 池日光; 辛海龙; 公绪金; 彭兆洋; 陈志强

doi:10.13205/j.hjgc.202412021

污泥冻融循环过程中的脱水性能及基于COMSOL Multiphysics的水热耦合分析

doi: 10.13205/j.hjgc.202412021

1. 哈尔滨商业大学能源与建筑工程学院, 哈尔滨 150023;
2. 哈尔滨工业大学建筑设计研究院, 哈尔滨 150090;
3. 哈尔滨工业大学城市水资源与水环境国家重点实验室, 哈尔滨 150090

基金项目:

黑龙江省自然科学基金联合引导项目(PL2024E017)

2023年度哈尔滨商业大学"青年科研创新人才"培育计划(2023-KYYWF-0986)

详细信息

作者简介:
郭子瑞(1985-),女,硕士生导师,博士,主要研究方向为固体废物资源化与能源化。ziruiguo@126.com

通讯作者:
郭子瑞(1985-),女,硕士生导师,博士,主要研究方向为固体废物资源化与能源化。ziruiguo@126.com

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出版历程
- 收稿日期: 2023-12-01
- 网络出版日期: 2025-01-18

DEHYDRATION PERFORMANCE OF SLUDGE DURING FREEZE-THAW CYCLE AND ANALYSIS BASED ON COMSOL MULTIPHYSICS HYDROTHERMAL COUPLING

1. School of Energy and Civil Engineering, Harbin University of Commerce, Harbin 150023, China;
2. The Architectural Design and Research Institute of HIT Co., Ltd., Harbin 150090, China;
3. State Key Laboratory of Urban Water Resources and Water Environment, Harbin Institute of Technology, Harbin 150090, China

摘要

摘要: 污泥经过缓慢冻结后再解冻,通常会大大改善自身的脱水性能。基于冻融循环法对城市污泥脱水效果进行了考察,采用响应曲面法,以污泥冻融温度(℃)、冻融时长(h)及冻融次数(次)为因变量,污泥含水率(%)为响应值,通过Box-Behnken中心组合设计法建立数学模型。结果显示:当冻融温度为-16.30 ℃,冻融时长为19.70 h和冻融次数为19次时,模型预测的最小污泥含水率为33.93%,模型R²>0.99,模型吻合度较好,说明响应曲面法用于优化冻融循环过程中调理污泥理化性质,改善脱水性能是可行的。污泥内部的水热过程是影响污泥资源化利用以及水资源利用的重要因素,传统的水热耦合理论模型忽略了非饱和介质中水分对流传热作用,在水分场与温度场耦合理论模型的数值实现上仍有困难。通过有限元模拟软件建立污泥冻融循环模型,以实验数据为基础,通过COMSOL Multiphysics的数学模块,实现考虑冰水相变和水分对流的温度场和水分场偏微分方程的耦合求解,分析了污泥水分对流与温度变化的关系。并通过场发射扫描电镜分析冻融前后污泥絮体微观结构和孔隙变化,为污泥冻融处理在优化污泥脱水性能方面的应用提供依据。COMSOL Multiphysics的PDE模块可以较好地模拟冻融循环条件下污泥水-热耦合过程,考虑冰水相变以及水分对流迁移影响,为污泥资源化利用以及水资源利用相关数值模拟研究提供参考。
- 市政污泥 /
- 冻融循环 /
- 脱水性能 /
- 响应曲面 /
- COMSOL Multiphysics /
- 水热耦合分析
Abstract: Sludge is slowly frozen and then thawed, which usually greatly improves the dewatering performance of the sludge. In this paper, the dewatering effect of urban sludge was investigated based on the freeze-thaw cycle method. The response surface method was used, taking the sludge freeze-thaw temperature (℃), freeze-thaw duration (h), and freeze-thaw time (n) as the dependent variables, and the sludge moisture content (%) as the response value, and a mathematical model was established by the Box-Behnken central combination design method. The results showed that when the freeze-thaw temperature was -16.30 ℃, the freeze-thaw time was 19.70 h, and freeze-thaw for 19 cycles, the minimum sludge moisture content predicted by the model was 33.93%, and the model R²>0.99, indicating that the response surface method was feasible to optimize the physical and chemical properties of the regulated sludge during the freeze-thaw cycle to improve its dewatering performance. The hydrothermal process inside the sludge is an important factor affecting the utilization of sludge and water resources. The traditional hydrothermal coupling model ignores the water’s effect on heat transfer in the unsaturated medium, and it is still difficult to realize the numerical value of the coupling theoretical model between the water field and temperature field. The sludge freeze-thaw cycle model was established through the finite element simulation software. Based on the experimental data, the coupling of ice-water phase transition and partial differential equation of water convection was solved, and the relationship between sludge water convection and temperature change was analyzed. The microstructure and pore changes of sludge flocs was analyzed by scanning electron microscope (SEM). It provides a basis for freeze-thaw treatment in optimizing sludge dewatering performance. The results show that COMSOL software can realize flexible definitions of sludge and hydrothermal parameters, ice water phase change latent heat and boundary conditions, and can realize hydrothermal field coupling analysis.
- municipal sludge /
- freeze-thaw cycle /
- dehydration performance /
- response surface /
- COMSOL Multiphysics /
- hydrothermal coupling analysis

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