摘要
检查井内跌水对污水管道中气体流动具有显著的促进作用。利用CFD对检查井跌水进行计算,将等效通风机特性曲线与管道阻力曲线联立,评价污水管道内的通风状况。研究表明,目前常见井盖开孔比较小,增加开启孔开口面积能显著增加下游管道安全长度,但是如果大到一定程度,继续增加开孔比对控制管道内甲烷气体浓度的效果并不显著。对于跌水高度为0.9m、井盖开孔比为0.125%和0.5%检查井,当污水管道管径为DN600时,由跌水通风确保的下游污水管道安全长度分别为164m和465m;当污水管道管径为DN800时,分别为246m和626m;当污水管道管径为DN1 000时,分别为327m和810m。
The waterfall in inspection well in sewer system could improve the venting condition in drainage pipes.Using CFD,the waterfall in inspection well was calculated,then,the equivalent venting machine curve characteristics were correlated with pipe resistance curve to evaluate the venting condition in drainage pipe.The results showed that increasing opening acreage of well cover,which was relatively small,could increase the safety length of the downstream pipe;however,when the opening ratio reached a certain value,the increase of opening ratio would not have great impacts on methane concentration control any more.If the waterfall was 0.9meter high,the diameter of sewer pipe was DN600,and the opening ratios of inspection well covers were 0.125% and0.5%,respectively,the safety length of downstream pipe would be 164 meters and 465 meters,respectively;if the sewer pipe diameter was DN800,the safety length of downstream pipe would be246 meters and 626 meters,respectively;if the sewer pipe diameter was DN1 000,the safety length of downstream pipe would be 327 meters and 810 meters,respectively.
出处
《给水排水》
CSCD
北大核心
2015年第9期146-150,共5页
Water & Wastewater Engineering
基金
西北地区历史文化村镇社区功能提长技术集成研究与示范(2013BAJ10B08)
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