建筑排水立管直接接入污水管网的通风性能分析  

Improvement of Sewer Ventilation Performance by Directly Linking with Building Vertical Pipe

作　　者：张二飞 卢金锁[1] ZHANG Er-fei;LU Jin-suo(School of Environmental and Municipal Engineering,Xi＇an University of Architecture ＆ Technology,Xi＇an 710055,China)

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055

出　　处：《中国给水排水》2018年第17期112-115,共4页China Water & Wastewater

基　　金：国家自然科学基金面上资助项目(51778523)

摘　　要：污水管道的通风状态对于抑制管道中有害气体的产生和释放具有重要的作用。为此,提出将建筑排水排出管接入市政管网,利用立管排水时吸入的气体来改善管网的通风状态。通过测量通风帽处瞬时风速和气压的变化发现,吸入气体在立管中会随着水流向下流动,最终进入管网。进入管网的气体,约有6%会从管段起端检查井的开启孔处逸出,而大约94%的气体在管道顶部空间流动,用来改善管网的通风状态。排水时吸入的气体量随着排水楼层高度和排水流量的增加而增加,一次排水时吸入的气体可以改善充满度为0. 5、管径为DN300的管道32 m范围内的通风状态。各检查井内H_2S和CH_4的浓度均为零,说明利用建筑立管排水时吸入的气体可以有效改善管网的通风状态。Ventilation condition of sewer system plays an important role in mitigating the produc- tion and release of harmful gases in the sewers. Therefore, it was proposed to directly connect the build- ing drain to the sewer system, where the ventilation condition of the sewer was improved by air inhaled from the vertical pipe. By measuring the change of instantaneous air velocity and pressure at the ventila- tion cowl, it was found that the inhaled air flowed down with water in the vertical pipe and finally flowed into the sewer. About 6% of the inhaled air escaped from the opening holes of the inspection well, and a- bout 94% of the inhaled air would flow into the headspace of the sewer to enhance the ventilation condition. The amount of inhaled air during drainage increased with the height of the drainage floor and drainage flow rate. The inhaled air during a single drainage could improve the ventilation condition within the range of 32 m pipe with diameter of DN300 and depth ratio of 0.5. The concentration of hydrogen sulfide and methane in the manhole were zero, indicating that the ventilation of the sewer had been effectively enhanced by inhaled air from the vertical pipe.

关 键 词：污水管道 排水立管 通风状态 有害气体 吸入气体 

分 类 号：TU992[建筑科学—市政工程]