Design Of Dust Generation And Concentration Measurement Device Based On Light Scattering Method

With the rapid development of China’s industrialization,industrial dust emission is also increasing.In order to achieve the purpose of environmental protection,it is necessary to monitor the concentration of dust particles emitted by factories.The measurement of smoke concentration can be divided into two categories: sampling and non sampling.With the rapid development of science and technology,the traditional measurement methods like membrane weighing have exposed a lot of defects in real-time,non-contact and so on.Non sampling methods have been widely studied and applied,in which the advantages of the photoelectric method to measure the concentration are gradually highlighted.In this paper,the design of smoke generation and concentration measurement device based on light scattering method is studied,The main contents are as follows:(1)Theoretical analysis and simulation.Because of the design selection and parameter selection of the device and the need for subsequent experimental measurement In this paper,based on the Mie scattering theory,the results show that there is a positive correlation between the scattered light flux and the mass concentration in a certain range.Experiments about the relationship between the particle size,relative refractive index,the incident wavelength and phasedistribution of the scattering intensity were simulated and analyzed.The results show that using a single forward or backward scattering method in the measurement of scattered light collection has many limitations,Therefore,a new method of multi-sensor information fusion is proposed,which is based on the combination of forward and backward scattering to measure particle size concentration of large range The simulation analysis provides a theoretical basis for the design selection,parameter selection and subsequent measurement.(2)Establishment of smoke generation and concentration measurement device.In the experimental stage,in order to simulate the different particle size and concentration in the flue gas under actual operating conditions,a kind of adjustable low concentration dust generating device is designed,The device is composed of a micro feeder and a variety of components,instrumentation The device can not only produce a certain amount of soot concentration,but also be monitored in real-time by the host computer.Based on the Mie scattering theory,the experimental device is designed and constructed based on the light scattering method,and the combination of forward and backward scattering method is used to collect the light signal by CCD camera,which can realize the real-time measurement of the particle concentration more accurately.(3)The realization of the main functions of software.(1)The start and stop adjustment of each part of the system is completed,and the data acquisition and recording of simulated flue gas are realized.Technical personnel can be real-time monitoring of each part of the system,and step debugging,and adjustthe running state of the system more quickly according to the real-time data(2)The smoke particle concentration is obtained after collecting and analyzing the scattered light intensity image,and the particle concentration data is transmitted to the data interface to display and form the historical curve stored in the host computer.According to monitoring data uploaded in real time,the operator can carry out a good human-computer interaction by upper monitor.(4)Experimental research and analysis.Experiments were carried out to generate the quantitative soot concentration.Under the condition that the experimental environment is relatively stable,the concentration of smoke and dust after the device running for different time lengths is compared,and the experimental phenomena are consistent with the theoretical analysis In addition,the light scattering method was used to measure the concentration of dust,and experiments about error comparison of multi-sensor information fusion method and single sensor light scattering method were carried out.,the results show that the design of the light scattering method to measure the concentration of particles in this paper is feasible by analyzing the experimental data.