Detection of airborne particles by condensation method

冷凝法检测空气中的颗粒物

• 批准号: 02650697
• 负责人: KOUSAKA Yasuo
• 金额: $ 1.28万
• 依托单位: University of Osaka Prefecture
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650697/
• 关键词: Condensation Nucleus Counter; Aerosol Particle; Counting Efficiency; CNC; Condensation; Sizing of Aerosol Particle; 超微小粒子; 低濃度粒子; 微粒子検出; 清浄空間; メンブレンガスフィルタ; 微粒子沈着

Condensation nucleus counter (hereafter CNC), a detector for ultra-fine aerosol particles by condensation of vapor onto the particles, which plays an important role in detection and sizing of aerosol particles smaller than 0.1) mum in diameter, has been studied from the view points of fundamental analysis to improve its performance and application techniques combined with it. The results obtained are as follows.1. Fundamental analysis for improvement in performance of CNCHigh flow rate (2.8 1/min and 14 1/min) mixing type CNC's were developed and evaluated the particle counting efficiency as the function of supers aturation formed in CNC's at various, operating conditions. it was found from the calculation of supersaturation and experiment that high counting efficiency was attained at the supersaturation as close as to the critical one derived from the classical nucleation theory proposed by Becker-D6hring-Zeldvich, where homogeneous nucleation was initiated. This fact gave us a theoretical criterion for developing high performance CNC'S. The performance of the CNC thus finally developed is summarized as follows : particle counting efficiency of 100% for particles larger than 10nm, efficiency of 60% for 5nm particles, and the flow rate of 14 I/min which is 50 times as high as existing CNC's were attained.2. Application techniques using CNCA new cumulative type electrical mobility analyzer combined with high flow rate (14 1/min) CNC above developed has been successfully developed, and it was found that the analyzer was capable of size analysis for atmospheric and room aerosol particles ranging 5-100nm in diameter. other application techniques using the prototype CNC include those for testing method of membrane gas filters having very high collection efficiency (99.9999999%), evaluation of deposition velocity of ultra-fine particles onto surfaces, and those for detecting bacteria and soluble impurities in water by aerosolizing method.

凝结核计数器（以下简称CNC）是一种利用水蒸气凝结在气溶胶粒子上的方法来探测超细气溶胶粒子的探测器，它在直径小于0.1 μ m的气溶胶粒子的探测和测量中起着重要的作用.本文从基本分析的角度出发，对其性能进行了改进，并结合CNC的应用技术进行了研究.本文研究了大流量（2.8 l/min和14 l/min）混合型数控系统的粒子计数效率，评价了在不同工作条件下，数控系统中形成的超饱和度对粒子计数效率的影响。从过饱和度的计算和实验中发现，在接近临界过饱和度的过饱和度下获得高计数效率，该临界过饱和度是由Becker-D 6 hring-Zeldvich提出的经典成核理论导出的，其中开始均匀成核。这一事实为研制高性能数控系统提供了理论依据。最终研制出的CNC的性能如下：对大于10 nm的粒子计数效率为100%，对5 nm粒子计数效率为60%，流量为14 I/min，是现有CNC的50倍.成功地开发了CNCA新型累积式电迁移率分析仪与高流速（14 l/min）CNC相结合的应用技术，发现该分析仪能够对直径为5- 100 nm的大气和室内气溶胶颗粒物进行粒径分析。使用原型CNC的其他应用技术包括用于测试具有非常高的收集效率（99.9999999%）的膜式气体过滤器的方法、评估超细颗粒在表面上的沉积速度以及用于通过雾化方法检测水中的细菌和可溶性杂质的那些。

项目成果

Niida, T., T. Kousaka and S. Oda: "The measurement of low level impurities in liquid by aerosolizing method" Proc. of the third International Aerosol Conference. 871-874 (1990)

Niida, T., T. Kousaka 和 S. Oda：“通过雾化法测量液体中的低含量杂质”Proc。

新居田 亨,向阪 保雄: "噴霧乾燥法による水中の細菌の計測" 化学工学論文集. 16. 847-850 (1990)

Toru Niida、Yasuo Mukaisaka：“通过喷雾干燥法测量水中的细菌”《化学工程杂志》16. 847-850 (1990)。

Niida,T.,Y.Kousaka and S.Oda: "The measurement of low level impurities in liquid by aerosolizing method" Proc.of the third International Aerosol Conference. 871-874 (1990)

Niida，T.，Y.Kousaka 和 S.Oda：“气溶胶法测量液体中低浓度杂质”第三届国际气溶胶会议论文集。

Yasuo Kousaka,Kikuo Okuyama Manabu Shimada,Yoshimasa Takii: "Developmenl of a Method for Testing Very HighーEfficiency Membrane Filters for Ultrafine Aerosol particles" Journal of Chemical Engineering of Japan. 23. 568-574 (1990)

Yasuo Kousaka、Kikuo Okuyama Manabu Shimada、Yoshimasa Takii：“开发用于测试超细气溶胶颗粒的高效膜过滤器的方法”日本化学工程杂志 23. 568-574 (1990)。

向阪 保雄,遠藤 禎行,山本 昭宏,室谷 義治,新居田 亨,福嶋 信彦: "大流量連続混合型CNCの性能評価" エアロゾル研究. 6. 359-364 (1991)

Yasuo Mukaisaka、Yoshiyuki Endo、Akihiro Yamamoto、Yoshiharu Murotani、Toru Niida、Nobuhiko Fukushima：“高流量连续混合型 CNC 的性能评估”Aerosol Research 6. 359-364 (1991)。