高温还原法气态总汞光学监测的冷凝温度影响研究  

Study on Influence of Condensation Temperature on Optical Monitoring of Total Mercury in High Temperature Reduction Method

作　　者：郑海明[1] 李长朝 ZHENG Hai-ming;LI Chang-zhao(School of Energy Power and Mechanical Engineering, North China Electric Power University, Baoding 071003 , P. R. China)

机构地区：[1]华北电力大学能源动力与机械工程学院,保定071003

出　　处：《科学技术与工程》2016年第30期165-168,共4页Science Technology and Engineering

基　　金：国家自然科学基金(11174078);河北省自然科学基金(E2012502046);中央高校基本科研业务费专项资金(12MS102)资助

摘　　要：由于现有监测技术只能直接分析气态零价汞，为了监测气态总汞浓度，需要将气态二价汞转化为气态零价汞。高温还原法在不需要任何催化剂的条件下可将二价汞高效率转化为零价汞。以高温状态进入吸收池内的气态零价汞对光谱的分析具有较大影响，需将进入吸收池之前的汞蒸气冷却。设置不同的冷凝温度，实验研究发现气态汞随着温度的升高，其在管路壁上的吸附能力越来越小；而随着温度降低其吸附能力增强。由浓度反演结果可以得到其最佳的冷凝温度在22~25T：范围，温度高或温度低，对气态总汞光学监测的反演都会造成较大误差。The oxidized mercury must be decomposed elemental mercury in order to monitor the total mercury concentrations because of existing monitoring technology can only analysis elemental mercury directly.The high temperature reduction method will transform oxidized mercury into elemental mercury efficiently without any cata-lyst.Elemental mercury in the absorption pool at a high temperature has a greater impact on the spectrum analysis.Therefore,the mercury vapor need to cool before enter the absorption pool.The experiment set a series of different cooling temperatures,which found that the adsorption capacity of gaseous mercury in the pipe wall is getting smaller with the increase of temperature.On the contrary,the adsorption capacity is enhanced with the decrease of cooling temperature.The best condensation temperature can be obtained from the results of concentration inversion is in the range of22?25°C?High temperature or low temperature will cause greater error to the mercury concentration.

关 键 词：高温还原法 气态零价汞 气态总汞 冷凝温度 差分吸收光谱法 

分 类 号：O433.4[机械工程—光学工程]