主管：中华人民共和国应急管理部
主办：应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU
消防科学与技术

消防科学与技术 ›› 2023, Vol. 42 ›› Issue (3): 298-302.

• • 上一篇    下一篇

城市垃圾填埋场气体泄漏扩散规律研究

李美霖1，李 铁1，贾海江1，2，赵锴悦1   

  1. （1.北京科技大学 土木与资源工程学院，北京 100083； 2.北京科学技术研究院 城市安全与环境科学研究所，北京 100054）
  • 出版日期:2023-03-15 发布日期:2023-03-15
  • 作者简介:李美霖（1998- ），女，辽宁抚顺人，北京科技大学土木与资源工程学院硕士研究生，主要从事企业生产风险评估与安全评价相关研究，北京市海淀区学院路街道30号，100083。
  • 基金资助:
    国家重点研发计划项目（2017YFC0804901）

Research on the law of gas leakage and diffusion in urban landfills

Li Meilin1, Li Tie1, Jia Haijiang1,2, Zhao Kaiyue1   

  1. (1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Institute of Urban Safety and Environmental Science, Beijing of Science and Technology, Beijing 100054, China）
  • Online:2023-03-15 Published:2023-03-15

摘要： 垃圾填埋场内部会产生各种各样的次生物质，其中以甲烷和二氧化碳为主，甲烷发生泄漏扩散引起的火灾爆炸风险极大。为了避免或减少此类安全事故的发生，以北京某城市生活垃圾填埋场为研究对象，监测泄漏气体点位在覆盖膜下泄漏的实际情况，并建立相应三维模型，采用Fluent软件对填埋气在大气中的泄漏扩散过程进行模拟。结果表明：在垃圾填埋场中集气汇总处、堆体边坡处最易发生泄漏，在标准状态下爆炸危险区域以泄漏源为中心径向距离0.5 m，纵向距离3.8 m内呈正态分布，且风速与气体扩散的径向距离成正比、纵向距离成反比。这为城市垃圾填埋场气体泄漏事故应急对策的制定及气体监测点的布置提供了理论依据。

关键词: 垃圾填埋场, 甲烷气体, 泄漏扩散, 数值模拟

Abstract: Abstract: Landfill will produce a variety of secondary biomass, of which methane and carbon dioxide are the mainstay, methane leakage and diffusion caused by the risk of fire explosion is extremely large. In order to avoid or reduce the occurrence of such safety accidents, taking a Beijing municipal domestic waste landfill as the research object, monitor the actual situation of leakage gas point under the cover film, and establish a corresponding three-dimensional model, the using of Fluent software to simulate the leakage and diffusion process of landfill gas in the atmosphere. The results show that the gas collection summary place and the slope of the pile in the landfill are the most prone to leakage, and the area where the explosion limit is reached in the standard state, the explosion hazard area is normally distributed within 0.5 m radial distance centered on the leakage source and 3.8 m longitudinal distance, and the wind speed is proportional to the radial distance of the gas diffusion and the longitudinal distance is inversely proportional. It provides a theoretical basis for the formulation of emergency countermeasures for gas leakage accidents in urban landfills and the layout of gas monitoring points.

Key words: Key words: landfill, methane gas, leakage diffusion, numerical simulation