Numeric simulation of conveyor transfer point and optimization of dust removal system in conveyor belt corridors
LIN Zijie1,, XU Qian1,2, WANG Fujiang1, HE Kebin2,, 1.BioMintec Environmental Technology (Shanghai) Co. Ltd., Shanghai 200333, China 2.School of Environment, Tsinghua University, Beijing 100084, China
Abstract:Conveyor transfer point is the main source of dust in conveyor belt corridors. In order to study dust removal effect of the joint technology of dust collector suction outlet and seal cover at transfer chute and to assist modification of dust removal system design, finite volume method CFD analysis was used through ANSYS Fluent software to conduct numeric simulation of the dust concentration distribution in conveyor belt corridors originated from the emission from belt transfer chute. The effects of vacuum pressure and seal cover length on dust mass concentration in conveyor belt corridors were investigated, and the emission of conveyor belt corridors to outer environment was also assessed. The result showed that dust emission from conveyor belt corridors would have negative effect on the environment if without proper control measures. Installation of seal cover at the chute outlet could improve dust removal efficiency. Maximum dust removal efficiency could not exceed the ratio of in-pipe air flow rate to induced air flow rate. The seal cover didn’t change the air consumption of duster. Dust mass concentration distribution in conveyor belt corridors was associated with vacuum pressure and seal cover length. For designing duster, induced air flow rate should be considered and the seal cover should be appropriately extended from duster vent. This study can provide guidance for dust control design of conveyor transfer chute at a lower cost. Key words:conveyor belt corridor/ negative pressure duster/ seal cover/ numeric simulation.
图1目标皮带通廊模型三维图 Figure1.3D map of the target conveyor belt corridor
CHEN X L, WHEELER C A, DONOHUE T J, et al. Evaluation of dust emissions from conveyor transfer chutes using experimental and CFD simulation[J]. International Journal of Mineral Processing, 2012, 110-111: 101-108. doi: 10.1016/j.minpro.2012.04.008
SANJOSE M, SENONER J M, JAEGLE F, et al. Fuel injection model for Euler-Euler and Euler-Lagrange large-eddy simulations of an evaporating spray inside an aeronautical combustor[J]. International Journal of Multiphase Flow, 2011, 37(5): 514-529. doi: 10.1016/j.ijmultiphaseflow.2011.01.008
1.BioMintec Environmental Technology (Shanghai) Co. Ltd., Shanghai 200333, China 2.School of Environment, Tsinghua University, Beijing 100084, China Received Date: 2019-12-10 Accepted Date: 2020-07-21 Available Online: 2020-11-11 Keywords:conveyor belt corridor/ negative pressure duster/ seal cover/ numeric simulation Abstract:Conveyor transfer point is the main source of dust in conveyor belt corridors. In order to study dust removal effect of the joint technology of dust collector suction outlet and seal cover at transfer chute and to assist modification of dust removal system design, finite volume method CFD analysis was used through ANSYS Fluent software to conduct numeric simulation of the dust concentration distribution in conveyor belt corridors originated from the emission from belt transfer chute. The effects of vacuum pressure and seal cover length on dust mass concentration in conveyor belt corridors were investigated, and the emission of conveyor belt corridors to outer environment was also assessed. The result showed that dust emission from conveyor belt corridors would have negative effect on the environment if without proper control measures. Installation of seal cover at the chute outlet could improve dust removal efficiency. Maximum dust removal efficiency could not exceed the ratio of in-pipe air flow rate to induced air flow rate. The seal cover didn’t change the air consumption of duster. Dust mass concentration distribution in conveyor belt corridors was associated with vacuum pressure and seal cover length. For designing duster, induced air flow rate should be considered and the seal cover should be appropriately extended from duster vent. This study can provide guidance for dust control design of conveyor transfer chute at a lower cost.
由图8(c)和图8(d)可知,封闭罩对减少皮带通廊排放系数有显著效果。风口压强为?500 Pa条件下每日可减少约8.3 g 粉尘排放,占未设置封闭罩时排放量的48%;风口压强为?100 Pa条件下每日可减少约14.6 g 粉尘排放,占未设置封闭罩时排放量的28%。 在满足原有除尘效果的前提下,适当延长封闭罩可减小除尘风量,降低除尘器能耗。