压差法大气污染物采样误差分析  

Analysis of errors in atmospheric pollutants sampling with differential pressure method

作　　者：杨文举[1] 苗德华[1] 邓三鹏[1] 祁宇明[1] 

机构地区：[1]天津职业技术师范大学机械工程学院,天津300222

出　　处：《环境工程学报》2015年第12期5987-5991,共5页Chinese Journal of Environmental Engineering

基　　金：国家重大科学仪器设备开发专项(2012YQ060147);天津市科技支撑重点项目(13ZCZDGX01500;14ZCZDSF00022)

摘　　要：智能综合大气采样器能对空气中总悬浮微粒及有害气体进行采样,使用孔板压差流量计和转子流量计分别进行气体流量测量。依据智能大气综合采样器采样原理,推导采样器孔板压差流量计理论流量公式,并通过实测数据对流量计计量公式进行验证。在此基础上,从3个方面分析大气采样器计量误差来源,并针对传感器压力取值误差,设计并验证增加采样次数取均值可以降低误差值;对因环境因素引起的误差,提出3种降低大气采样器采样误差的方法。Total suspended particulate and harmful gas in the atmosphere can be collected by intelligent integrated air sampler,and gas flow rate can also be measured through differential pressure orifice plate flowmeter and rotameter. Based on principle of intelligent integrated air sampler,theoretical formulas of the flow rate,which measured by differential pressure orifice plate flowmeter,are proposed. Test experiments prove that the formulas are accurate,and sources of measure errors in the intelligent integrated air sampler are analyzed from three aspects. According to the pressure value error of sensors,a method of increasing sampling frequency and taking average value is proposed,which can reduce the value of error effectively. Also,three approaches are put forward,to reduce the errors caused by environmental factors.

关 键 词：大气采样器 压差流量计 误差 

分 类 号：X851[环境科学与工程—环境工程]