Water Circulation Characteristics And Simulation Of The Mobile Phase Of Converter Steam Cooled Hood

Converter steam cooled hood is the core of converter gas sensible heat recovery system. Because converter steelmaking is unstable, hood working fluid is in a non-steady-state condition. Water cycle characteristics are more complex. Site investigation shows that the life of steam cooled hood is short, it bursts frequently. Especially mobile segment Ⅰ initial use squib proportion up to 80% a year during the period, which is seriously affecting the safety and continuity. So the study on water circulation characteristics of mobile segment Ⅰis necessary. We should clarify the mechanism of heat transfer deterioration caused by burst pipes, and propose measures for improvement.Take tangshan iron and steel company 150 t converter steam cooled hood mobile segment as the research object, based on the actual structure and actual production parameters, the study determines the mobile segment boundary conditions. Mobile segment flue gas side heat transfer parameters are simulated.Results show that under the condition of forced circulation medium pressure, steam cold smoke cover mobile period of vaporization of water cooling tube point location is located under the hood mobile segment by the upward of 300 ~ 500 mm, because of the heat flux density is too high, cause the circulation ratio is less than the limit circulation ratio, water cooling pipe actual working condition of vaporization rate is greater than the critical evaporation rate, heat transfer deterioration occurredThe study proposes improvement measures from two aspects, reduce heat flux and increasing the mass flow. It has important practical significance on improve the ife of converter steam cooled hood and improve the safety and stability of converter production.