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预测和控制垃圾填埋场内的高温在空气和循环过程中,基于热不平衡模型
Shao-Jie Wu1, Qi-Teng Zheng2, Yong Zhao2
1Department of Geotechnical Engineering, Tongji University, Shanghai, 200092, China; Department of Mechanical, Aerospace and Civil Engineering, School of Engineering, The University of Manchester, Manchester, M13 9PL, United Kingdom.
透气与液循环再循环相结合,可以控制垃圾填埋场的温度. 一个新的模型表明,单独的通风不会产生爆炸性气体,指导更安全的垃圾填埋场设计.
科学领域:
- 环境工程 环境工程
- 地质技术工程 地质技术工程
- 废物管理 废物管理
背景情况:
- 空气增强了可持续的垃圾填埋,但存在温度升高,火灾和爆炸的风险.
- 液循环对于减轻气化垃圾填埋场的热风险至关重要.
研究的目的:
- 开发和验证一个局部的热不平衡模型,用于预测垃圾填埋场在空气和液循环过程中的温度.
- 评估爆炸性气体形成的风险,并确定联合通风和循环系统的最佳操作参数.
主要方法:
- 开发了一个局部热不平衡模型,包括生物降解热量,蒸发,液气流和毛细管效应.
- 该模型在OpenFOAM中使用有限体积方法实现,并与实验数据验证.
- 在一个典型的有氧垃圾填埋单元上进行了模拟,以分析热行为和气体成分.
主要成果:
- 当地热不平衡模型准确地预测了垃圾填埋场的温度,而平衡模型高估了高达15°C的温度.
- 模拟表明,单独的通风不会在垃圾填埋场产生爆炸性气体混合物.
- 为了有效控制温度,提出了空气压 (2000-4000 Pa) 和再循环速率 (0.0001-0.0008 m/s) 的最佳操作参数.
结论:
- 开发的模型为填埋场的热管理提供了可靠的预测.
- 透气与优化液循环相结合,是可持续填埋垃圾的安全有效策略.
- 与管理垃圾填埋场温度的间歇性方法相比,连续循环提供了更好的冷却.
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