Study On Mechanical Performance Around Holes Of 4800m~3 Blast Furnace Sealed Cowling

The blast furnace sealed cowling is located at the top of the blast furnace, including gas sealed cowling, throat and parts of stack. This area supports deferent kinds of load, for example, exterior equipment, stuff, ascending pipe exploding, interior gas's high pressure's effect and high temperature state of inner liner reducing which is exist during the later of production period. In the mean time, in order to satisfy the technological requirements, there are four gas exporting pipe holes (outer diameter is up to 2.4m), a 3.93mx1.945m chute hole, 1.065mx0.765m manhole and threeφ420mm probing hole. These big holes and small holes weaken the section of the shell seriously, which makes the stress concentration along the holes side. It makes the blast furnace sealed cowling's force complicated. Making it clear holes side of the blast furnace sealed cowling's force ability under any affecting aspects is very important. But the task which is done all over the world is focusing on the force capacity of the whole blast furnace, or single hole which makes the stress concentration effect, but there's no report on the blast furnace sealed cowling holes'local force capacity under different affecting aspects.This paper uses ANSYS software to build 4800m3 blast furnace sealed cowling model and analyze four aspects which affect the holes'side stress concentration (including opening ratio of cooling stave, different thickness of blast furnace sealed cowling, exporting pipe and chute hole with different thickness stiffener and different temperature). On the basement of the world's research on blast furnace, according as the blast furnace's geometry dimension and force loads supplied by design institute etc. This paper's research is divided into following parts mainly:①Make sure both the calculation precision and time span's finite element grid generation requirement by the contrastive elastic analysis of 12 blast furnace sealed cowling holes sides'different fine grid models'under different loads.②According to the team's working results, establishing 7 blast furnace sealed cowling under different furnace stack opening ratio, analyzing the top cover's force ability under the effect of the furnace stack's different opening ratio, make sure the blast furnace sealed cowling's bottom restraint's establishment.③Establishing 5 different thickness blast furnace sealed cowling models, calculating the blast furnace sealed cowling holes sides'force capacity under different thickness, doing the evaluation of the safety degree of the existing blast furnace's design formula. ④Establishing 6 different thickness stiffener's blast furnace sealed cowling model, calculating the blast furnace sealed cowling holes sides'stress concentration control effect under different stiffener and advancing choosing principle of the stiffener's thickness.⑤According to possibly blast furnace's high temperature working during the later production, establishing 5 temperature's blast furnace sealed cowling model, calculating the blast furnace sealed cowling holes sides'force capacity under different temperature.