施工场地扬尘排放运移特征研究
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摘要
施工场地内粉尘的运移规律对研究颗粒污染和净化等有很大作用,为有效解决施工中产生的粉尘污染问题,探究粉尘飘散规律,以某工程扬尘状况为研究对象,利用Fluent软件,运用欧拉-拉格朗日气-尘颗粒两相流动数学模型,模拟不同粒径粉尘在不同风速下受工地有无围挡阻隔的飘散效应。研究结果表明:无围挡作用时风速由1.6 m/s增大至6.7 m/s时,扬尘浓度显著提高;有围挡作用时形成较大负压,对后方粉尘扩散有抑制作用;围挡距离尘源扩大到10 m时,抑制作用最明显,且风速达到6.7 m/s以上时可以减弱扬尘向围挡后上方的扩散作用;所得结论为粉尘防治和相关人员的保护提供科学对策,现场应用效果较好。
The law of dust migration in the construction site has a great effect on the study of particle pollution and purification. In order to effectively solve the dust pollution during construction, the dust drift law is explored. The dust situation of a project is taken as the research object, and the Fluent software is used. The Euler-Lagrangian gas-dust particle two-phase flow mathematical model is applied to simulate the drift effect of different particle size dusts at different wind speeds on the site. The research results show that the dust concentration is significantly increased when the wind speed is increased from 1.6 m/s to 6.7 m/s without the enclosure; when the enclosure is used, a large negative pressure is formed, which inhibits the rear dust diffusion; when the dust source is expanded to 10 m, the inhibition effect is most obvious, and when the wind speed reaches 6.7 m/s or more, the diffusion of dust to the upper part of the enclosure can be weakened; the conclusions provide scientific countermeasures for dust prevention and related personnel protection, and the field application effect is better.
The law of dust migration in the construction site has a great effect on the study of particle pollution and purification. In order to effectively solve the dust pollution during construction, the dust drift law is explored. The dust situation of a project is taken as the research object, and the Fluent software is used. The Euler-Lagrangian gas-dust particle two-phase flow mathematical model is applied to simulate the drift effect of different particle size dusts at different wind speeds on the site. The research results show that the dust concentration is significantly increased when the wind speed is increased from 1.6 m/s to 6.7 m/s without the enclosure; when the enclosure is used, a large negative pressure is formed, which inhibits the rear dust diffusion; when the dust source is expanded to 10 m, the inhibition effect is most obvious, and when the wind speed reaches 6.7 m/s or more, the diffusion of dust to the upper part of the enclosure can be weakened; the conclusions provide scientific countermeasures for dust prevention and related personnel protection, and the field application effect is better.
引文
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[2]温玲丽.城市建筑施工扬尘空间运移模式的数值模拟[D].兰州:兰州大学,2011.
[3]王维建,刘荣华,王鹏飞,等.不同吹吸风口位置掘进面粉尘扩散规律数值模拟研究[J].矿业工程研究,2011,26(4):24-28.
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[8]李丹丹,李敏,刘松林,等.湍流模型和壁面函数对有障碍半开口空间氢气燃烧模拟的影响[J].中国安全生产科学技术,2018,14(10):59-63.
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[10]张原,桂祥友,徐佑林.基于FLUENT软件的粉尘在筛分车间除尘管道内沉降规律的研究[J].水力采煤与管道运输,2010(4):15-19.
[11]赵玲,唐敏康,江小华.循环型空气幕送风角度对隔断巷道风流效果影响的分析[J].中国安全生产科学技术,2015,11(3):34-39.
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[13]Vranckx S ,Vos P ,Maiheu B ,et al.Impact of trees on pollutant dispersion in street canyons:A numerical study of the annual average effects in Antwerp,Belgium[J].Science of the Total Environment,2015,532:474-483.
[14]马悦.工作区吹吸式通风系统优化设计方法的研究与应用[D].西安:西安建筑科技大学,2013.
[15]赵玲,蒋仲安.循环型矿用空气幕出口风速对隔断风流效果影响的数值模拟[J].矿业安全与环保,2011,38(4):18-20.
[16]李亚林.变曲率流道内固液两相CFD-DEM方法及在大型脱硫泵中的应用[D].镇江:江苏大学,2015.
[17]Vranckx S ,Vos P ,Maiheu B ,et al.Impact of trees on pollutant dispersion in street canyons:A numerical study of the annual average effects in Antwerp,Belgium[J].Science of the Total Environment,2015,532:474-483.
[18]樊世星.高瓦斯易自燃采空区瓦斯与遗煤自燃共生灾害研究[D].合肥:安徽建筑大学,2016.
[19]肖峻峰,许峰,樊世星,等.大断面综掘巷道长压短抽条件下粉尘运移模拟[J].中国安全科学学报,2017,27(2):127-132.
[2]温玲丽.城市建筑施工扬尘空间运移模式的数值模拟[D].兰州:兰州大学,2011.
[3]王维建,刘荣华,王鹏飞,等.不同吹吸风口位置掘进面粉尘扩散规律数值模拟研究[J].矿业工程研究,2011,26(4):24-28.
[4]Amorim J H ,Rodrigues V ,Tavares R ,et al.CFD modelling of the aerodynamic effect of trees on urban air pollution dispersion[J].Science of the Total Environment,2013,461-462(7):541-551.
[5]吴立荣,王丹.基于Fluent综放工作面移架作业粉尘运移及浓度变化规律模拟[J].矿业安全与环保,2015,42(5):29-33.
[6]李兰,石玉成.激光粒度分析仪测量黄土粉体粒度的应用研究[J].甘肃科学学报,2009,21(4):46-50.
[7]周正,吴畏,郑昕,等.喷嘴雾化特性及脱硫废水蒸发数值模拟[J].化工进展,2018,37(1):32-38.
[8]李丹丹,李敏,刘松林,等.湍流模型和壁面函数对有障碍半开口空间氢气燃烧模拟的影响[J].中国安全生产科学技术,2018,14(10):59-63.
[9]陈文创,张蕊,张文远,等.复杂非对称岔管数值模拟中湍流模型的影响[J].清华大学学报(自然科学版),2018,58(8):752-760.
[10]张原,桂祥友,徐佑林.基于FLUENT软件的粉尘在筛分车间除尘管道内沉降规律的研究[J].水力采煤与管道运输,2010(4):15-19.
[11]赵玲,唐敏康,江小华.循环型空气幕送风角度对隔断巷道风流效果影响的分析[J].中国安全生产科学技术,2015,11(3):34-39.
[12]杨丹.露天堆煤场粉尘起尘及运移扩散规律研究[D].阜新:辽宁工程技术大学,2007.
[13]Vranckx S ,Vos P ,Maiheu B ,et al.Impact of trees on pollutant dispersion in street canyons:A numerical study of the annual average effects in Antwerp,Belgium[J].Science of the Total Environment,2015,532:474-483.
[14]马悦.工作区吹吸式通风系统优化设计方法的研究与应用[D].西安:西安建筑科技大学,2013.
[15]赵玲,蒋仲安.循环型矿用空气幕出口风速对隔断风流效果影响的数值模拟[J].矿业安全与环保,2011,38(4):18-20.
[16]李亚林.变曲率流道内固液两相CFD-DEM方法及在大型脱硫泵中的应用[D].镇江:江苏大学,2015.
[17]Vranckx S ,Vos P ,Maiheu B ,et al.Impact of trees on pollutant dispersion in street canyons:A numerical study of the annual average effects in Antwerp,Belgium[J].Science of the Total Environment,2015,532:474-483.
[18]樊世星.高瓦斯易自燃采空区瓦斯与遗煤自燃共生灾害研究[D].合肥:安徽建筑大学,2016.
[19]肖峻峰,许峰,樊世星,等.大断面综掘巷道长压短抽条件下粉尘运移模拟[J].中国安全科学学报,2017,27(2):127-132.
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