Experimental study and numerical simulation of dust accumulation in bustle pipe of COREX shaft furnace with areal gas distribution beams

Abstract

The following study investigated the dust accumulation in the bustle pipe of the shaft furnace with Areal Gas Distribution (AGD) through physical and numerical simulations. Although the experimental and numerical results were obtained from different-sized furnaces, the results had a similar tendency, where an initial dust deposition zone formed in the packed bed located in front of slots 8-12. The growth velocity of the deposition zone became larger than the descending velocity. It then spread upwards, to plug the slots, until the dust accumulation was formed. The gas velocity in the bustle pipe decreased after passing the AGD beam due to nearly 60% gas that went into the furnace through the AGD inlet. This was the primary cause for the dust accumulation in slots 8-12. Both the physical and the numerical results showed that when the blast volume increased, it effectively reduced the dust flux in each slot and decreased the clogging effect.

Numerical Simulation of Combustion Characteristics in the Dome Zone of the COREX Melter-Gasifier: The Effect of Rising Gas

“…The dust particle diameter is set to be 28.88 μm with a uniform distribution, and the particle density is 2200 kg/m 3 . The specific heat capacity is consistent with the setting of anthracite, 1680 J/(kg·K) …”

“…The specific heat capacity is consistent with the setting of anthracite, 1680 J/ (kg•K). 35 3.2. Geometry and Boundary Conditions.…”

Dynamic analysis of blockage behavior of fine particles in a packed bed by discrete element method

“…In COREX shaft furnace, due to the install of AGD in the bustle zone, the inlet gas velocities of reducing gas at different slots are different [12], and thus the initial velocities of fine particles carried by reducing gas are different. This work discussed the influence of the initial velocity of fine particles on the distribution of blockage, as shown in Figure 10.…”

“…Dong et al [11] studied the flow and accumulation behaviour of fine particles in systems like an ironmaking blast furnace. Zhou et al [12] investigated the fine particle accumulation in the bustle pipe of a COREX shaft furnace through physical simulation. What's more, macroscale multiphase flow mathematical models were developed to investigate the flow behaviour of fine particles in packed bed of ironmaking blast furnace [13][14][15].…”

An unresolved CFD-DEM method for studying migration and clogging of fine particles through a packed bed

“…Takahashi et al conducted the infiltration and clogging transported through the updraft of a filled bed, and they proposed that the critical diameter ratio where clogging occurs is greater than 0.12 [15]. Zhou et al used a physical simulation to investigate the deposition of fines in the COREX shaft tube [16]. The experimental approach helps us to understand the basics of granular flow behaviour.…”