| Dust not only causes serious harm to human health,but also may cause dust explosion in a certain space and have an important impact on the visibility of the atmospheric environment.In order to solve the dust pollution,various dust collectors have been invented,such as mechanical dust removal technology,electric dust removal technology,wet dust removal technology and filter dust removal technology,as well as high-efficiency composite dust removal technology improved by conventional technology and agglomeration technology for dust treatment.Based on the analysis of the existing dust removal technology,this thesis proposes a new dust removal method—ionization and dust removal method.Firstly,we increase humidity of the air in a certain space,and then ionize generating a large amount of ions in the space by the air ionization device.When a large amount of ions appear in the air,the water vapor in the space is condensed by the ions as condensation nuclei.In the form of raindrops,the raindrops and the dust in the air reunite and grow up,so that the dust agglomerates and grows to a certain mass and particle size,and settles under the action of gravity to achieve the purpose of dust removal to complete the purification of the air.In order to study the method of ionizing rainfall dust removal,we analyze the theory of method of ionization rainfall dedusting,and then we establish the experiment system of ionized rainfall dedusting.The system consists of air ionization device,steam generator,dust generating device and dust concentration measuring instrument.In this experimental system,ion-promoted steam condensation experiments and dust removal experiments in ionized rainfall environments were studied.We through theoretical analysis and experimental research on ionizing rainfall dedusting,we come to the following conclusions.(1)The main dust removal mechanisms of ionizing precipitation are gravity sedimentation,electrostatic action,inertial collision,interception,diffusion,humidification and condensation,and negative ion condensation.The smaller the particle size,the more obvious the electrostatic effect.The dust sedimentation efficiency can be effectively improved by making the environment of ionizing precipitation in the air.(2)In the experiment of ion-promoted condensation of water vapor,the experiment is continuously humidified into the test space.The results show that whenionized air produces ions,when the air humidity is 80.9% and the temperature is18.8℃,the water droplets on the copper wire begin to condense.The size of the water droplets is about 0.3mm.The water droplets on the copper wire continue to condense and grow in 1 hour until the end of the experiment,the humidity in the air is 99.9%,the temperature is 27.9 ℃,and the water droplets on the copper wire condense to about 3.5mm.In the absence of ionized air,the particle size of condensation droplets on the copper wire was 0.1mm within 1 hour of the experiment.(3)In the test space,the experimental temperature(15±2)℃,the experimental humidity(80±5)%,(85±5)%,(90±5)%,(95±5)%)were manufactured,and the same mass of coal dust was injected into the test space every time.The experimental study on the effect of precipitation and dust removal was carried out,and the comparative analysis of precipitation experiments under the conditions of air ionization experiment and without air ionization experiment was carried out.Ming:Under the same conditions and at the same time,the dust concentration measured in the ionized rainfall environment is lower than that in the non-ionized air,and the dust concentration measured in the high humidity environment is lower than that in the low humidity environment.It is proved that the precipitation efficiency of dust can be effectively improved in ionized rainfall environment. |
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