Effervescent Spraying: A New Approach to Spraying High Solids Black Liquor, 1998 Engineering Conference Proceedings
Effervescent spraying is introduced as an innovative method for spraying high solids black liquor at temperatures below its flashing point. In its simplest form, it involves injecting gas at some point upstream of the nozzle orifice, such that a dispersed-bubbly flow is produced. Upon exiting the nozzle, the gas bubbles explode, shattering the liquid into ligaments and drops. The level of gas required to produce a particular average drop size varies depending on the liquid viscosity and flowrate; i.e., lower liquid flowrates and higher viscosities require more gas to attain a specified drop size. Liquid viscosities ranging from 100 to 10000 mPas were evaluated using a model fluid and industrial-scale, commercially available black liquor nozzles. It is concluded that effervescent spraying enables control of the spray drop size, independent of liquor flowrate, percent solids, temperature, and nozzle orifice size.
Effervescent Spraying: A New Approach to Spraying High Solids Black Liquor, 1998 Engineering Confere