Design & Development of a Top Layer Compaction Mechanism to Improve Strengt of Top Layer Iron Ore Sinter

摘要

In the sinter process, the degree of compaction influences the bulk density of sinter raw mix which further influences to attain optimum bed permeability. Bulk density 1 of sinter bed lower than the optimum value increases the bed permeability. The quality of product sinter and the productivity of the sinter machine have a strong relation with bed permeability as improper bed perme?ability leads to mismatch in wave front and heat front velocity which leads to weaker product sinter and the reduced productivity of the sinter machine. The machine #2) of Sinter Plant #3 of Bhilai Steel Plant(BSP) has a sintering area of 360 m2 and capable to produce sinter with a rated capacity of 11232T/day at a specific productivity of 1.3 t/m2/hr. This machine was not able to produce sinter to its rated capacity for which a detailed study was done to focus on the problematic areas. One of the reasons was that the proper com?paction of top layer was not achieved in sinter machine resulting lower bulk density of sinter raw mix. This led to formation of weaker sinter in the top layer, higher return fines generation and lower productivity of the machine. This paper describes the work undertaken in design of compaction roller mechanism for optimizing the bed permeability. A laboratory study was conducted at the sintering laboratory at Research and Development Centre for Iron & Steel, Ranchi, to obtain optimum bulk density. The laboratory study report, site condition and space availability of sinter machine were studied to design and develop a compaction roller mechanism for sinter machine #2 of sinter plant #3 of BSP. The variable weight self rotating compaction roller mechanism consists of high temperature bearings with graphite-based lubrication was designed and installed. This led to the formation of quality sinter from top 100mm - 150mm layer by increasing particle to particle contact and improved heat transfer. Major tech?nological benefits achieved from this innovation were, Yield of the product sinter increased, Return sinter generation reduced and increased the sinter productivity.