In response to the problem of incomplete combustion of hazardous waste paste after it enters the pre‑decomposition furnace，which causes fluctuations in carbon monoxide emissions from cement kilns and makes the emissions exceed the standard，a method of using multiple gas jets to break up and atomize hazardous waste paste is proposed.A hazardous waste paste containing 40% sludge mass fraction is determined for compatibility based on the experimental results of slump and viscosity，The feasibility of break up and atomization of hazardous waste paste is demonstrated based on the effects of rotational shear and structural flow shear.An experimental platform for breakup and atomization characteristics is built，and the influence of nozzle number i，nozzle to spray gun discharge edge distance d，and feeding speed v on atomization angle，spray distance，geometric shape，particle size，and mass distribution was studied.The research results indicate that the slump of hazardous waste paste containing 40% sludge mass fraction is 100 mm，the viscosity is 224 200 mPa·s，the yield stress is 219.2 Pa，the calorific value is 27.18 MJ/kg，the suitable combustion temperature is 1 000 ℃，and the residence time in the furnace is at least 400 s，with the highest burnout rate.It is determined that the fluid belongs to a Bingham fluid based on the relationship between shear rate and shear stress，as well as the phenomenon of shear thinning.The research on atomization characteristics shows that the atomization angle is between 60°~80°，which is basically consistent with the theoretical value of 70°，and the atomization geometry is in the shape of a bullet.According to the study of mass distribution，the atomization effect is optimal when i=3，followed by i=5，and i=2 has the worst effect.When d=160 mm，the atomization effect is optimal，followed by d=240 mm，and d=80 mm，the effect is the worst.As the pushing speed v increases，the atomization effect gradually deteriorates.The new sprayer adopts the staggered layered three‑dimensional impact jet method，with i=3 and d=160 mm as the optimal design input parameters.The research results can provide reference for the study of new gas jet spray guns.

hazardous waste  /  multiple gas jets  /  rheological characteristics  /  gas jets sprayer  /  breakup and atomization characteristics