Numerical Simulation Of Erosion In Elbow Based On Gas-solid Flow

In air pollution control, safe and efficient operation of the dust removal system is veryimportant. In order to solve the environmental and safety problems caused by dust pipelineerosion, the study to two-phase flow and erosion in the elbow is necessary.First of all, in the overview analysis of gas-solid two-phase flow model and erosion model,selected the RNG k εmodel as the turbulent model, particle trajectory model as the model ofparticle motion, Tabakoff model as the erosion rate density calculation model, studied thegas-solid flow and erosion of90owear elbow by computational fluid dynamics simulation ofCFX.After the numerical simulation of gas-solid flow and erosion in ordinary elbow and “aircushion” wear elbow. The results showed that: velocity of gas and particle in wear coverdecreases, velocity of particle impact the elbow shell decreases,"air cushion" wear elbow hasgood wear effect.Under certain conditions, the ordinary pipe erosion rate density is2.77×10^-8kg/m². s, the wear area is5×10^-2m², the mass loss per second is1.4x10^-9kg; the erosion ratedensity of elbow No1is3.8x10^-9kg/m². s, the wear area is10^-4m²,the mass loss per second is3.8×10^-13kg; the erosion rate density of elbow No2is4.87×10^-9kg/m². s, the wear area is2×10^-2m², the mass loss per second is9.6×10^-11kg.Efficiency of wear aear to the gas-solid flow and erosion rate density is studied bysimulation, the results showed that: as the worn out area increases, the gas and particle velocityin the wear cover increases, the pressure decreases, the wear rate increaselarge. When the wornout area is2.4×10^-3m², the mass loss per second is3.8×10^-13kg, when the wear area is9.6×10^-3m², the mass loss per second is9.6×10^-11kg.Efficiency of wear cover height to the gas-solid flow and erosion rate density based onnumerical simulation is studied. The results showed that: the gas and particle velocity decreaseswith increasing wear cover height, the pressure increases, the erosion rate density decreases.withthe worn out area of9.6×10^-3m²of wear elbow, when wear cover height is20mm, the erosionrate density is8.13×10^-9kg/m². s, the mass loss per second is400×10^-12kg; When wear coverheight is50mm, the erosion rate density is1.99×10^-9kg/m². s, the mass loss per second2×10^-12kg.Efficiency of the pipe inlet flow velocity to the gas-solid flow and erosion rate density isstudied.The results showed that: With the fluid velocity increases, the erosion rate densityincreases. When the speed is16m/s, the mass loss per unit time is2x10^-12kg, when the speed is24m/s, mass loss per unit time is26.2×10^-12kg.Wear effect of wear elbow with baffle is studied by numerical simulation. The results showthat: there is little wear effect on elbow with baffle.Without baffle, the erosion rate density is3.8 ×10^-9kg/m². s, the wear area is10^-4m², the mass loss per unit time is3.8×10^-13kg. With thebaffle, the erosion rate density is4.86×10^-9kg/m². s, the wear area of is10^-4m², the mass lossper unit time is4.86×10^-13kg.