RECONSTRUCTION OF FUNCTION OF PARTICLES DISTRIBUTION BY SIZES WITH LASER SENSING METHOD USE
Abstract and keywords
Abstract (English):
A laser sensing inverse task solution method without using of integral equations has been suggested in this paper and it can be used for aerosol particles’ sizes and concentration monitoring equipment creation for the real practice of the industrial production. This method is based on the laser radiation intensity weakening at a limited set of the probing laser radiation wavelengths. The computer simulation of aerosol flow parameters has been fulfilled and its results showed that during the regular operation of enterprise’s dust cleaner equipment at the certain point of the technological process the aerosol can be described by a function of particles distribution by sizes, and this function depends on finite number of parameters. The particles’ sizes distribution function is described by the logarithmic normal law after a fabric filter as a last step of the dust cleaner equipment. The laboratory setup realizing the laser sensing at the several laser radiation wavelengths possibilities simultaneously by the spectral transparency and integral light scattering methods for investigation of studied aerosol flows’ optical parameters dependence has been created. A complex refractive index of the studied substance has been investigated. The dependence between the logarithmic normal distribution function parameters and the average volume - surface diameter values received as a result of the sensing has been revealed. The suggested method of the inverse task solution can be developed for the dust gas cleaning equipment refusals detection.

Keywords:
environmental monitoring, function of particles distribution by sizes, laser sensing, lasers
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1. Введение

При производстве цемента и других строительных материалов в атмосферу выбрасывается пыль. Основные технологические процессы этих производств — механическая активация и химическая обработка полуфабрикатов и получаемых продуктов в потоках горячих газов — всегда сопровождаются выбросами пыли и других вредных веществ в атмосферу. 

Для уменьшения количества пыли в отходящих газах в аспирационном воздухе используются различные пылеулавливающие установки. В соответствии с действующими правилами и нормативами для контроля работы подобных установок используется массовая концентрация частиц пыли. Согласно дополнению № 8 к ГН 2.1.6.1338–03 от 19.04.2010 «ПДК загрязняющих веществ в атмосферном воздухе населенных мест» [1] установлена предельно допустимая концентрация аэрозольных частиц в зависимости от их аэродинамического диаметра — РМ1, РМ2.5 и РМ10. Экологический производственный  контроль загрязнений атмосферы осуществляется в соответствии с действующим проектом предельно-допустимых выбросов. При этом контроль источников выбросов проводится импактными методами и с периодичностью, как правило, один раз в месяц или в квартал.

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