چكيده به لاتين
Pyrolysis process is one of the methods for waste polymer management. This process reduces environmental hazards and is economical as well and produces the valuable products such as fuel which can cover part of the fuel demands. Thus, understanding the mechanism, reaction and transport phenomena is necessary to improve and optimized the process. In this way, in the present study, the pyrolysis of waste tire in a rotating reactor has been investigated experimentally. In order to investigate the effective parameter of the final temperature on the pyrolysis, different experiments were performed under isothermal conditions at different final temperatures and the amount of liquid and solid products were measured.After determining the optimum temperature to obtain the maximum amount of liquid product and ensuring that the result is consistent with the results of previous researchers, the effect of temperature change in non-isothermal conditions, on the amount of pyrolysis products was reviewd as a new study. Also, by analysing the collected products at different time intervals of the pyrolysis under isothermal conditions, the change in the composition of the liquid product during the pyrolysis process was investigated.The results of experimental researches are in agreement with the results reported by other researchers. In this regard by increasing the temperature of rotating bed from 450 to 550°C, the amount of liquid would be increased (about 12.6%) and by increasing the temperature from 550 to 750°C, the amount of liquid would be reduced (about 6.1%). Increasing the heating rate, at first causes to increase the liquid yield and then had negative effect on liquid yield. By Changing the heating rate, the liquid yield was increased 3% during time period from 30 min to 50 min, By analyzing the products collected at different time intervals in the period of 15 to 65 minutes of pyrolysis at final temperatures of 400 and 500 ° C under isothermal conditions, the yield of the liquid product at 400 ° C had a decreasing trend over time, while this trend for temperature of 500 ° C was first increasing and then decreasing.Also by reviwing the results of density, CHNS and Sim.Dist.analyzes on liquid products obtained in the intervals of 0-15 minutes and 15-35 minutes of pyrolysis in a isothermal condition at a temperature of 500 ° C, was identified that, at the beginning of the pyrolysis, an increasing liquid production and a light product like gasoline are produced. The liquid produced in the next period has the highest percentage of products like heavy fuel. As time increases and secondary reactions begin, the liquid production decreases and a heavier product is produced.
Keywords:
Pyrolysis, rotary reactor, waste tire, experimental studies, yield.
