模拟烹饪油烟的粒径分布与扩散  

Particle Size Distribution and Diffusion for Simulated Cooking Fume

作　　者：李双德[1] 徐俊波[1] 莫胜鹏 李文辉[1,2] 高佳佳 曹亚裙 陈运法[1] LI Shuang-de XU Jun-bo MO Sheng-peng LI Wen-hui GAO Jia-jia CAO Ya-qun CHEN Yun-fa(State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China University of Chinese Academy of Sciences, Beijing 100190, China Key Laboratory of Healthy ＆ Intelligent Kitchen System Integration, Ningbo 315336, China)

机构地区：[1]中国科学院过程工程研究所,多相复杂系统国家重点实验室,北京100190 [2]中国科学院大学,北京100190 [3]浙江省健康智慧厨房系统集成重点实验室,宁波315336

出　　处：《环境科学》2017年第1期33-40,共8页Environmental Science

基　　金：中国科学院战略性先导科技专项(B类)(XDB05050300);国家自然科学基金项目(21306199)

摘　　要：烹饪油烟颗粒物粒径分布与扩散特性研究有助于解析其对室内空气质量和居民健康的影响,采用电子低压撞击器(ELPI)实时监测了油烟机开启和关闭状态下,模拟烹饪油烟发生处和3 m外位置处,0.03~10μm范围内油烟颗粒数浓度和质量浓度随粒径分布.油烟颗粒主要以655 nm以下的细颗粒为主.油烟机能够显著降低室内油烟浓度,开启油烟机后,油烟发生处颗粒数浓度从2.8×106个·cm-3降低到2.3×105个·cm-3,PM2.5(空气动力学直径≤2.5μm的颗粒)质量浓度从85.9 mg·m-3降低到6.2 mg·m-3.油烟机对PM10的净化效率高于PM2.5.油烟迅速从发生处扩散到3 m外,无通风状态下,总颗粒数浓度衰减达65%,PM2.5质量浓度衰减达75%.计算流体动力学(CFD)模拟了油烟机对油烟PM2.5质量浓度场扩散分布影响.红外摄像仪监测了油烟温度场分布扩散,以扇形向外扩散,伴随着油烟温度梯度降低.Studying particle size distribution and dispersion characteristics of cooking oil fume can help to analyze the influence of the particles on indoor air quality and the health of the residents. Electrical low pressure impactor（ ELPI） was employed to measure the number and mass concentration of the particles size range of 0. 03-10 μm at two different locations in the kitchen space with smoke exhaust on and off,respectively. The cooking particles were mostly located at below 655 nm. The smoke exhaust with open condition could remarkably decrease the kitchen＇s cooking fume. The number concentration of particles decreased from 2. 8 × 106cm-3to 2. 3 ×105cm-3,and PM2. 5（ aerodynamics diameter ≤2. 5 μm particulate matter） mass concentrations decreased from 85. 9 mg·m-3to 6. 2mg·m-3. The sucking efficiency of smoke exhaust for PM10 was higher than PM2. 5. The number concentration of particles could be declined by 65%,and the cooking fume of PM2. 5could be declined by 75% during the diffusion process detected at the area of 3 m far away from the area where cooking took place. The distribution of PM2. 5mass concentration field of oil fume was simulated by computational fluid dynamics. The temperature field distribution of oil fume was monitored by infrared camera,presenting sector diffusion with the temperature decreasing from 70℃ to room temperature.

关 键 词：油烟颗粒物 电子低压撞击器(ELPI) 粒径分布 油烟扩散 温度场 

分 类 号：X513[环境科学与工程—环境工程]