| Nowadays,with the acceleration of industrialization,the rapid development of industrial manufacturing industry represented by iron and steel industry,the continuous discharge of industrial exhaust gas,waste water and waste residue can not be effectively disposed of and utilized,resulting in further deterioration of environmental pollution.In order to respond to the national call,implement green manufacturing engineering,promote the construction of green factories,and build a green manufacturing system with characteristics.As a major polluter,iron and steel enterprises shoulder great social responsibility.It is urgent to build a green,energy-saving and environmental protection iron and steel industry.The flue gas discharged through the chimney during the blast furnace slag flushing of iron and steel enterprises not only has a high exhaust temperature,but also contains a large amount of saturated water vapor and more suspended particulate matter,which not only exacerbates the formation of"haze",but also causes a large number of industries Waste heat and water waste.Based on the current research status at home and abroad,in order to study the problems of exhaust heat from slag exhaust slag exhaust chimney,water vapor condensation recovery,and capture of suspended particulate matter in blast furnace exhaust slag exhaust steam chimney,a steel company in Handan City,Hebei Province The flue gas discharged from the slag flushing exhaust chimney of 1#blast furnace is used as the research object.The theoretical analysis,field data sampling,experimental research and other methods are used to analyze and explore the flue gas purification and water vapor condensation recovery to determine the deep purification and condensation of flue gas.Specific experimental methods for water recovery.Aiming at the suspended particles in the flue gas,study the process of removing dust particles by the particle bed dust collector,seek for the key factors that affect the dust removal efficiency and pressure drop of the dust collector,and explore the operating conditions to improve the performance of the dust collector;for the saturated water vapor in the flue gas,Investigate the process of condensate in the bow-shaped baffle heat exchanger,seek for the key factors that affect the condensation efficiency of the heat exchanger,explore the improvement of the operating conditions of the condensate recovery of the heat exchanger,and purify the exhaust fumes from the blast furnace slag flushing of the steel plant And resource recovery to provide ideas,thereby reducing the level of dust pollution in steel companies and increasing the recycling rate of resources to achieve the"Beijing-Tianjin-Hebei PM2.5 reduction of 25%"goal.The research results show that for a granular layer dust collector,when the filter layer thickness is 80mm,the filter material particle size is 3mm,and the filtration time is between 25-40min,the flue gas flow rate is less than 0.9m/s,and the dust mass concentration is 3g/m~3,The dust removal efficiency can be maintained above 90%,and the pressure drop is about 700pa;for the baffle heat exchanger,when the cooling water flow is 45-70m~3/h,the saturated water vapor moisture content is between200-1300g/Kg When the flow rate is less than 22m~3/h,the overall condensation efficiency can be maintained above 80%.The results of this study will provide a concrete plan for the flue gas whitening project of a 1#blast furnace slag exhaust steam chimney of a steel company in Handan City. |
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