Simulation analysis of the influence of working medium pressure of dust removal system on dust deposition characteristics in butterfly valve region

Dust of blast furnace gas deposits easily on the bottom of seat sealing surface of the tri-eccentric butterfly valve, which causes serious stuck and damage of the valve plate, thereby affects blast furnace product and brings great economic loss. To reduce the dust deposition, a kind of automatic dust removal system is designed and its efficacy is simulated. Based on FLUENT module of ANSYS Workbench, as well as standard k-ε turbulence model and DPM model, simulation analysis of the influence of 3 inlet pressures (0.25,0.30,0.35 ) of working medium (N2) in dust removal system and 2 different valve plate jaw openings (45°,90°) on the dust deposition trajectory in butterfly valve region are conducted, and the influence mechanism of inlet pressure on the dust deposition is analyzed. The results show that the dust removal system can reduce the dust deposition under five combined conditions except under the condition of a valve plate jaw opening of 45°and an inlet pressure of 0.25 MPa. The dust removal system has much better effect under the following conditions: valve plate jaw opening of 45° and inlet pressure of 0.30 MPa, or valve plate jaw opening of 90° and inlet pressure of 0.25 MPa