A scaled-down experimental apparatus was constructed to examine smelt shattering as it occurs during typical recovery boiler operation. Water-glycerine solutions and air were used in place of smelt and steam. A high-speed camera and image processing software was used to record and quantify liquid shattering in terms of droplet number and size distributions, as a function of air velocity, air nozzle position, liquid flow rate, and liquid viscosity. The results demonstrated that: increasing shatter jet velocity reduced average droplet size; increasing the liquid flow rate increased droplet size; and placing the shatter jet nozzle closer to the liquid stream decreased droplet size. These results were all as expected. The effect of liquid viscosity (1-50 cP) depended on the shatter jet velocity: at high air velocities even the viscous liquid was well shattered, but at lower velocities the effect of viscosity on shattering was significant.
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