利用空气负离子提升室内空气品质技术研究
发布时间：2018-12-13 22:58
【摘要】：我国在近三十年来,化石燃料伴随着工业的迅猛发展而大量燃烧,导致目前全国各个地区空气质量日益恶化,尤其是近几年冬季雾霾天气的频现严重影响人们的健康,“空气安全”已经成为继“水安全”和“食品安全”之后的又一个急需解决的社会安全问题。针对目前室外环境大气污染在短期内无法彻底解决的现状,室内空气污染治理成为热门研究话题。负离子室内净化技术是其中重要研究对象之一。目前关于负离子对提升室内空气质量(Indoor Air Quality,简称IAQ)的应用基础内容还缺乏深入的研究,本课题基于负离子净化空气原理,在人工气候室内通过调节环境参数,研究负离子在不同工况下对室内空气净化效率的提升作用和关系研究,同时针对环境温湿度对负离子浓度的影响程度进行了单因素实验研究。另外对负离子在室内浓度扩散规律及其影响因素开展正交实验。最后本文针对混合通风和地板送风两种气流组织方式下的负离子浓度动态分布运用CFD方法做了分析。研究结果表明:(1)负离子对室内多种空气污染物具有净化作用。负离子对可吸入颗粒物(PM2.5)、有机物(TVOC)以及细菌的净化效率,去除率分别为98.64%(8h)、61.20%(4h)、98.29%(2h)。衰减实验表明:负离子对可吸入颗粒物的去除效率要明显高于负离子对挥发性有机物的去除作用。(2)环境温湿度与负离子浓度呈非线性二次关系,环境温湿度单因素分别为温度22-30℃,相对湿度在55%-65%区间上,负离子浓度处于相对高浓度区域。(3)得出了实验负离子浓度下将室内PM10与可挥发性有机物浓度同时降至室内空气质量标准的时间与室内二者的污染浓度的关系式。(4)负离子浓度在风力轴向上衰减比较慢,在与风力垂直方向上衰减较快;在横向60-80cm和100-120cm存在两次衰减率较大的现象;根据正交试验方差分析,对负离子在室内空间衰减程度影响的显著性从高到低依次是:PM10浓度TVOC浓度风速,风速对负离子衰减影响相对室内污染物较小,风速也不宜太大,宜保持在1.5m/s。(5)混合通风比地板通风更快使室内负离子浓度稳定在一定状态且呼吸层面负离子浓度较高,但地板送风稳定状态负离子浓度比混合送风更为均匀和适中。
[Abstract]:In recent three decades, fossil fuels have been burning in large quantities with the rapid development of industry, which has led to the worsening of air quality in various regions of the country at present, especially the frequency of haze weather in winter has seriously affected the health of people in recent years. Air safety has become another urgent social safety problem after water safety and food safety. Indoor air pollution control has become a hot research topic in view of the current situation that outdoor air pollution can not be solved completely in the short term. Negative ion indoor purification technology is one of the important research objects. At present, the basic content of the application of negative ion pair to improve indoor air quality (IAQ) is still lack of in-depth research. Based on the principle of negative ion purifying air, the environmental parameters are adjusted in the artificial climate room. The effect and relationship of negative ions on indoor air purification efficiency under different operating conditions were studied. At the same time, the influence of ambient temperature and humidity on the concentration of negative ions was studied by single factor experiments. In addition, orthogonal experiments were carried out on the diffusion law of negative ions in indoor concentration and its influencing factors. Finally, the dynamic distribution of negative ion concentration under mixed ventilation and floor air distribution is analyzed by CFD method. The results show that: (1) negative ions can purify many indoor air pollutants. The removal efficiency of PM2.5, (TVOC) and bacteria were 98.64% (8h), 61.20% (4h) and 98.29% (2h), respectively. The attenuation experiments showed that the removal efficiency of negative ions on respirable particulates was significantly higher than that of negative ions on volatile organic compounds. (2) there was a nonlinear quadratic relationship between ambient temperature and humidity and the concentration of negative ions. The single factor of ambient temperature and humidity is 22-30 鈩，
本文编号：2377402
[Abstract]:In recent three decades, fossil fuels have been burning in large quantities with the rapid development of industry, which has led to the worsening of air quality in various regions of the country at present, especially the frequency of haze weather in winter has seriously affected the health of people in recent years. Air safety has become another urgent social safety problem after water safety and food safety. Indoor air pollution control has become a hot research topic in view of the current situation that outdoor air pollution can not be solved completely in the short term. Negative ion indoor purification technology is one of the important research objects. At present, the basic content of the application of negative ion pair to improve indoor air quality (IAQ) is still lack of in-depth research. Based on the principle of negative ion purifying air, the environmental parameters are adjusted in the artificial climate room. The effect and relationship of negative ions on indoor air purification efficiency under different operating conditions were studied. At the same time, the influence of ambient temperature and humidity on the concentration of negative ions was studied by single factor experiments. In addition, orthogonal experiments were carried out on the diffusion law of negative ions in indoor concentration and its influencing factors. Finally, the dynamic distribution of negative ion concentration under mixed ventilation and floor air distribution is analyzed by CFD method. The results show that: (1) negative ions can purify many indoor air pollutants. The removal efficiency of PM2.5, (TVOC) and bacteria were 98.64% (8h), 61.20% (4h) and 98.29% (2h), respectively. The attenuation experiments showed that the removal efficiency of negative ions on respirable particulates was significantly higher than that of negative ions on volatile organic compounds. (2) there was a nonlinear quadratic relationship between ambient temperature and humidity and the concentration of negative ions. The single factor of ambient temperature and humidity is 22-30 鈩，
本文编号：2377402
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