Based On Later-stage Combustion Of Water-safety Cycle For Structure Optimization Of Evaporative Cooling Flue

There are cyclical and non-steady state characteristics of converter steelmaking process,which leads to cyclical change of vaporization flue.With the decrease of pressure in whole vaporization flue system,Saturated water in the the down tube system and heat tube system turn into a large number of steam.It will lead to water circulation deterioration,heat transfer temperature difference enhancement,frequent tube explosion.Therefore,there is an urgent need in the design,manufacture,operation and water cycle efforts to extend the service life of equipment to reduce the accident rate to ensure the long-term safety flue gas flue.In this paper,the 150 t converter flue gas system of a steel plant is studied.The operating conditions of the converter flue gas flue system are analyzed theoretically and the different reasons leading to the water pipe explosion are studied.The structure and operation data of the flue gas system were collected and analyzed,and the structure of vaporization flue was optimized for the safety of water cycle during post combustion.The results show that the heat intensity of the heating surface of the fixed and movable sections is more than 400KW/m2 when the converter is running.Therefore,in the engineering design or transformation,the use of forced circulation,the mass flow rate of more than 1500 kg /(m2·s)to consider,the heat pipe diameter should be selected small size high pressure boiler tubes,effectively prevent the heating tube over-burning phenomenon.Based on the analysis of thermodynamic calculation,hydraulic calculation and stress calculation results of the existing vaporized flue.The results can provide technical reference for structural design and system design of converter flue.