Pipe Structure And Lining Structure Optimization Of The Hot Blast Stove

One of the important equipments required for blast furnace iron making is hot air furnace.Hot stove is used to supply high temperature and pressure of the air which is flowing through thepipeline for blast furnace. However, when the high-temperature and high-pressure air is throughpipes, a large number of lined of the hot air pipe is off, and then the red-hot and the air leakagephenomenon is on the pipe, which has seriously affected the improvement of the air temperature,reduced the productivity of the blast furnace. The study shows that, red-hot and the air leakagebeing on the pipes is due to two things: First, the high pressure air flow in the pipeline scouringthe weak parts of the walls of the pipe, then the pipe wall lined off; Second is the pipelineunreasonable stress, resulting in large force on the weak position of the pipe. All in all, the key ofthe hot air pipes damaged is caused by the lateral displacement of the pipeline and irrational ofthe pipeline structure.Because of the Series of pipeline, firstly, I analysis using FLUENT software, pipelines andgas flow field to identify the impact of high-temperature and high-pressure to air pipes,especially the stress, which is in order to determine the weak parts of the pipeline. All of theseare for the structure optimization and improvement of lined. Secondly, the structuraloptimization of the pipeline is Mainly refer to the pipe bearing and bellows designed which isrequirements to the overall structure of the pipeline design, including the arrangement of pipesupports, bellows selection and lined transformation; finally, pipeline thermal stress is analyzedby using ANSYS software, verifying the feasibility of the study and determine the rehabilitationprograms. Improvement program are as follows:Firstly, improve the pipeline supports are meaning to removing the original trolley at themanifold and being replaced by a tripod. At the low of the Hugh duct of the hot stove andoblique pipe sections add two fixed bearings by the corner of the pipe. Secondly, Pipelinecompensation design is meaning to select a different compensation bellows at different pipesections to restrict the direction of the pipe. Thirdly, pipeline rods improvements are meaning tochange the original pipeline segment trolley to overall trolley which is to eliminate the deadcompensation, solving the issues of trolley elongation compensation. Finally, pipe linedrenovation is meaning to thick the work layer and thin the non-working layer of the lined, whichis through the FLUENT simulation to the hot stove pipe, combined internal situation ofpipeline at the head of the hot air pipe and divergence of the manifold.Through the above improvement program, the hot stove air temperature can be up to1200°,the amount of deformation of the hot air pipe can be maintained within an allowable range, andespecially the stress concentration portion of the pipeline, such as the displacement of thedivergence is reduced to about95%of the original, the force of the bellows is reduced to about80%of the original. In other words, the layout of pipeline overall remained unchanged, pipe stress concentration sites will not be too large deformation. So that we can guarantee the stressconcentration positions will not be lined off, solving the pipeline redness, bulge problem, whichis to ensure the air temperature requirements.