Fig 1.
Schematic diagram of main suction dust removal system.
1- boundary of unit; 2- inlet of the airflow; 3- discharge valve; 4- gravity dust collector; 5- cyclone dust collector; 6- explosion venting device; 7- bag filter; 8- outlet of the airflow.
Fig 2.
Schematic diagram of side suction dust removal system.
1- boundary of unit; 2- inlet of the airflow; 3- discharge valve; 4- gravity dust collector; 5- explosion venting device; 6- cyclone dust collector; 7- bag filter; 8- outlet of the airflow.
Fig 3.
Schematic diagram of the simulation test unit.
1- discharge valve; 2- pedestal; 3- gas canister; 4- pulse valve; 5- main body of the test device; 6- exhaust fan; 7- inlet of the airflow.
Fig 4.
Schematic diagram of the numerical simulation model.
(A) Schematic diagram of the model structure; (B) Schematic diagram of meshing.
Fig 5.
Variation in mass flow rate on the bottom surface.
Table 1.
Parameter settings of numerical simulation model.
Fig 6.
Numerical simulation results with open subchambers.
(A) Schematic diagram of the streamline distribution; (B) Schematic diagram of velocity vectors.
Fig 7.
Numerical simulation results with subchamber 1 closed.
(A) Schematic diagram of the streamline distribution; (B) Schematic diagram of velocity vectors.
Fig 8.
Numerical simulation results with subchamber 2 closed.
(a) Schematic diagram of the streamline distribution; (B) Schematic diagram of velocity vectors.
Fig 9.
Numerical simulation results with subchamber 3 closed.
(A) Schematic diagram of the streamline distribution; (B) Schematic diagram of velocity vectors.
Fig 10.
Layout of observation points.
Fig 11.
Histogram of speed values at measuring points under different conditions.
(A) All subchambers open; (B) subchamber 1 closed; (C) subchamber 2 closed; (D) subchamber 3 closed.
Table 2.
Calculation results of uniformity index.
Fig 12.
Diagram of test system and test devices.
(A) Schematic diagram of test system: 1- quantitative dust generator; 2- air duct; 3- simulation test unit; 4- solenoid valve; 5- exhaust fan; 6- aneroid barometer; 7- U-type manometer; 8- sampling box; 9- rotameter; 10- vacuum pump; 11- compensated micro pressure gauge; (B) quantitative dust generator; (C) simulation test unit.
Fig 13.
Variations in air volume and working resistance of the simulation test unit.
Table 3.
Test results for the total dust removal efficiency of the simulation test unit.
Fig 14.
Influence of pulse interval on dust removal effect.
Fig 15.
Influence of pulse duration on dust removal effect.
Fig 16.
Influence of cycle interval on dust removal effect.
Fig 17.
(A) Bag filter units of the main suction dust removal system; (B) bag filter units of the side suction dust removal system.
Fig 18.
Railway ballast bed CSV in operation.
(A) Main suction dust removal system in operation; (B) side suction dust removal system in operation.
Table 4.
Test results of total dust mass concentration.