FLUENT Simulation Analysis Of Automatic Dust Removal Model For The Valve In The BFG Pipeline

Blast furnace gas(BFG)generated in the process of blast furnace production contains plenty of dust,which deposits easily on the bottom of seat sealing surface(deposition surface)of the butterfly valve in the pipeline,causing serious stuck and damage to the valve plate,thereby affects the blast furnace product and brings economic losses.At present,mature and advanced methods for dust removal on the deposition surface in the butterfly valve region have not been proposed.Reducing or preventing dust deposition on the deposition surface in effective ways could prolong the butterfly valve life and reduce the frequency of replacement,thereby is conducive to the maintenance of normal blast furnace production activities.Basing on numerical simulation,an automatic dust removal system for the butterfly valve region in the BFG pipeline was designed and its dust removal efficacy was analyzed.Firstly,the control equations for numerical simulation of the butterfly valve region flow field in the BFG pipeline were established.Through comparative analysis,the standard k-? model for gas phase turbulent and the DPM model for real-time tracking of particles in the gas-solid two phases flow were chosen.The parameters of the dust particle in BFG were obtained.Using Pro/E,the three-dimensional computational domain model of the butterfly valve region flow field in the BFG pipeline was established.The dust deposition characteristics in butterfly valve region were obtained through real-time tracking of the dust movement trajectories in butterfly valve region flow field with different valve plate jaw openings(15°,30°,45°,60°,75°,90°)and BFG/dust inlet flow speeds(8 m/s,12 m/s,16 m/s).Basing on the dust deposition characteristics,an automatic dust removal system and the three-dimensional computational domain model of the butterfly valve region flow field in the BFG pipeline containing the automatic dust removal system was established using Pro/E.The dust deposition characteristics in butterfly valve region were obtained through real-time tracking of the dust movement trajectories in butterfly valve region flow field within/without the automatic dust removal system,under different valve plate jaw openings(15°,30°,45°,60°,75°,90°)and working media inlet flow speeds(0.25 MPa,0.30 MPa,0.35MPa)of the automatic dust removal system.Through comparative analysis of the dust removal efficacy,the design feasibility of the automatic dust removal system was verified.The dust deposition characteristics on the deposition surface of butterfly valve in theBFG pipeline were firstly obtained through tracking analysis.Then the design of the automatic dust removal system and its feasibility test through simulation analysis were performed as the main part of the thesis.The research results can provide a fundamental theoretical basis for the design of the real-time dust removal system on the butterfly valve deposition surface in the BFG pipeline.