Experimental and numerical study on slag deposition and growth at the slag tap hole region of Shell gasifier

Multiphase flow patterns in entrained-flow slagging gasifiers: Physical modelling of particle–wall impact at near-ambient conditions

“…As a matter of fact, when the impact energy far exceeds the adhesion energy, the coefficient of restitution is primarily a function of the energy losses due to plastic deformation, as described by Eqs. (1), (3) and (6). Accordingly, the restitution coefficient decreases with an increasing impact velocity, and it is a function of the yield velocity only [37].…”

“…Most industrial EF gasifiers operate in the slagging mode: fuel particles migrate toward the reactor walls, mainly due to swirled/tangential flow and "turbophoresis" promoted in the reaction chamber. Bulk-to-wall migration of solids results, thanks to the very high operating temperatures, into the build-up of a slag layer of molten ash, which flows along the reactor internal walls and is eventually drained at the bottom of the gasification chamber [1][2][3][4][5][6].…”

Effects of Design/Operating Parameters and Physical Properties on Slag Thickness and Heat Transfer during Coal Gasification

“…Because this decreased the temperature difference with the gas (T 4 gas − T 4 surf ), QGL was decreased by 16.7% compared to the reference case. In contrast, QLS was increased by 6.1% by the higher Tsurf.…”

“…For example, the syngas temperature within the gasifier dominates the depositing particle temperature and temperature profile developed within the liquid slag. Because the slag viscosity is strongly dependent on the temperature, the gas temperature can directly influence the slag thickness [16][17][18][19]. The size and shape of a gasifier are also important parameters that affect the ash deposition rate and angle of the gravity force applied to the slag [20].…”

Heating technique of slag-tapping hole in high-temperature coal gasifier

“…There have been a number of studies on inhibiting adhesion to the heat exchanger tube in a pulverized coal boiler [13][14][15], to the wall reaching to the exit zone [16] and to the side wall just below the slagtapping hole [17] of an entrained-bed gasifier. This paper, by contrast, is on the first study intended to heat and to inhibit adhesion of fused slag at the hole of an entrained-bed gasifier.…”