| Blast furnace gas is one of the four kinds of gas which can be recycled in metallurgical industry.The utilization of its latent heat and sensible heat is an important way to conserve energy and develop circular economy,so the efficient and rational purification of blast furnace gas is premise to ensure the normal and stable operation of the following waste heat utilization process.This topic focuses on the problems in the application of the mainstream dry bag dust removal technology.Based on the technical route of bag-to-electricity conversion,this project studies the electrostatic dust removal technology of single electric field blast furnace gas from the aspects of electric field configuration and air distribution,etc.,which provides basic data support and technical guidance for industrial application.The main research results are as follows:(1)Aiming at the corona characteristic requirement of single electric field dust collection,with high voltage and high current as the goal,the configuration of the electrodes optimization test and the current density distribution analysis are carried out on the wire-plate and wire-tube structures,so two optimized electrode configurations are obtained respectively.The plate type optimization electrode configuration plan is:The discharge linear type uses the double angle steel and the V15,the same pole pitch uses 300mm,and the linear distance uses about 80-120mm;The tubular type optimization electrode configuration plan is:The anode plate uses regular hexagonal tube,the discharge linear type uses WE25(90°),and the same pole pitch uses 350mm.(2)Based on the optimized polar scheme,the ionization characteristics of high temperature and high pressure gas were experimented.The influence of gas composition,gas pressure and gas temperature on the corona characteristics were systematically analyzed,and the corresponding influence rules were obtained.The new research has been supplemented and revised for the early research,which laid the foundation for blast furnace gas dust removal.The main conclusions are as follows:①Gas pressure has a significant effect on ionization characteristic.With the increase of gas pressure,the volt-ampere characteristic curve is shifted right and the ripple voltage and breakdown voltage are increased.For the breakdown current,tube and plate structure performance is significantly different.For the tubular structure,with the gas pressure increases,the breakdown current gradually decreases,but the breakdown current law of the plate structure is basically the first rise and then fall,corresponding to the maximum breakdown current.② As the gas pressure increases,the breakdown voltage increases monotonically,and the low pressure section is basically linear.However,the high pressure segment growth rate is slowed down obviously,having a exponential or logarithmic relationship.③Gas composition has a certain influence on the ionization characteristic,and the impact of voltage compared with the current is more significant.④ With the gas temperature rises,the volt-ampere characteristic curve is turned left,and the breakdown voltage and breakdown current are both decreased.(3)Through the numerical simulation calculation,the flow field of electrostatic precipitator of target structure is analyzed and optimized.The control scheme of the uniform flow field is obtained and verified by the physical model experiment,which provides the airflow distribution design scheme for the industrial application.(4)The dust removal performance of tubular and plate structures was experimented,and the influence rules on dust removal performance of electric field wind speed,dust concentration,working voltage and airflow distribution was obtained.After the simulation experiment of dust removal performance,the dust collection performance of the tubular structure is more excellent,and the efficiency of dust removal is as high as 99.91%.Electric field wind speed of industrial equipment design can be considered about 1m/s. |
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