Effect of waste PVC addition on performance of coal water slurry and their combustion properties
In order to relieve the pressure of waste PVC treatment and recover hydrocarbon resources,the waste PVC was added to pulverized coal to prepare PVC-coal slurry.The fixed viscosity mass fraction,rheological properties,and stability of the slurry after mixing waste PVC were analyzed.The slurry morphology and fractal dimension of blended waste PVC were analyzed using SEM-EDX and fractal theory,and the mechanism of the influence of blended waste PVC on the performance of coal slurry was explored.The combustion characteristic index and kinetic parameters of raw coal slurry and PVC-coal slurry were evaluated by thermoweight analysis method and Coats-Redfern integration method.The results show that the waste PVC can improve the slurry concentration but reduce the stability.The more the amount of waste PVC,the smaller the fractal dimension of slurry,and the higher the concentration of slurry.Addition of the waste PVC exhibits a synergistic effect on coal slurry combustion.When the addition amount of waste PVC is 3%and 5%,the burnout rate and comprehensive combustion performance of coal slurry will improve,promoting combustion reaction.Inhibition of combustion reaction when the addition amount is 8%and10%.When selecting the Coats Redfern approximation,the linear correlation of coal water slurry combustion is highest when the reaction order n=1 is selected,and the apparent activation energy and frequency factor of the slurry after mixing 5%waste PVC are the highest.
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