Experimental Investigation on Atomization Properties of Coal-Water Paste Fired Into Pressurized Fluidized Bed Combustor

According to the properties of coal-water paste (CWP), a series of experimental devices were constructed to study the atomizing characteristics of the CWP nozzle deeply. The particle size and its distribution of several types of atomizing nozzle of CWP in the spray are measured by PIV measurement and newly developed image processing software. The influences of every factor on the atomizing properties are analyzed. The atomizing experimental results show that atomizing quality of CWP was found to correlate with the characteristics of CWP, air to CWP mass ratio, atomizing air motion, coal particle size distribution and the structure of atomizer etc. mass median diameter (MMD) of atomizing particle decrease with the increase of gas to CWP mass ratio, and the proper type of nozzle and proper parameters for engineering are suggested.