氧碘化学激光器废气排放污染评价

Exhaust gas pollution assessment of chemical oxygen-iodine laser

氧碘化学激光器运行过程中会将氯气、碘蒸气等有毒有害物质排入大气,对工作场所空气质量和人员健康存在安全隐患。采用点源扩散的高斯模式,建立了小风条件下氧碘化学激光器废气的扩散模型,结合工作场地人员分布情况,计算得到激光器废气排放后15min内,距地面1.5m高度、距排放点500m范围内废气中有毒成分氯气和碘的质量浓度空间分布。根据质量浓度空间分布情况,选取采样点,以Na_2SO_3溶液作为吸收液对氯气和碘进行了同时采样,并采取离子色谱测量了吸收液中氯离子和碘离子的质量浓度。结果表明:氧碘化学激光器废气排入大气后,氯气质量浓度最高为0.200mg/m^3,碘蒸气质量浓度小于检测方法的检出限0.030mg/m^3,低于国家职业卫生标准规定的最高容许质量浓度限值1mg/m^3。

The hazardous exhaust gases,such as chlorine and iodine which are emitted from chemical oxygen-iodine laser(COIL),are harmful to air quality and personnel health in workplace.In this paper,based on the Gauss point source diffusion mode,exhaust gas diffusion model of COIL is established in the light wind or windless conditions.During the 15 minutes operating period of COIL,chlorine and iodine are accumulated in the air.The spatial distribution of concentration at the height of 1.5m is calculated at the distance of 500 maway from the laser.Five sampling points were selected according to the spatial distribution of the pollutants concentration.In the measurement,Chlorine and iodine were collected simultaneously by using sodium sulfite solution as absorber.The concentrations of Cl^-and I^-in the absorption solution were measured by ion chromatography.The results show that the maximum concentration of chlorine was 0.200mg/m^3 in situ and the iodine concentration was under the detection limit of 0.030mg/m^3.Both of them are much less than the allowed concentration limit of harmful materials(1mg/m^3)specified in national occupational health standard.