【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。更多还原

【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.更多还原