Theoretically, the oil yield of waste tire pyrolysis can reach 45% - 50%, that is, about 450 to 500 kilograms of tire oil can be refined from one ton of waste tires. However, in the actual production process, the oil yield often decreases, mainly affected by the following factors.
1.Tire types
Tires of different types vary in material, structure and oil content. For example, large engineering tires, truck tires and steel cord tires generally have a relatively high oil yield due to their high manufacturing specifications and good quality. These tires have a high rubber content and better rubber quality, so they can produce more fuel during the pyrolysis process. In contrast, ordinary car tires, motorcycle tires and bicycle tires have a lower oil yield because they are used with lower intensity and the specification requirements during manufacturing are not as strict as those of steel cord tires. In addition, the degree of tire wear also affects the oil content and thus the oil yield.
2.Equipment and technology
The type of pyrolysis equipment and process parameters have a significant impact on the oil yield. Advanced continuous pyrolysis equipment can ensure continuous and stable heating of materials, uniform temperature distribution and complete pyrolysis reaction, resulting in a higher oil yield. In contrast, simple batch equipment is prone to temperature fluctuations, which may lead to incomplete pyrolysis of some tires and limit the oil yield. Regarding process parameters, the pyrolysis temperature is crucial. In the range of 350°C - 550°C, the oil yield increases with the increase of temperature. However, when the temperature exceeds 550°C, the already produced oil may be cracked into gas or coke for the second time, resulting in a decrease in the oil yield. The heating rate is also important. A rapid heating rate enables the tires to decompose quickly, which is conducive to the formation of oil. If the heating rate is too slow, the tires will not decompose in time, and some components may be carbonized, reducing the oil yield.
3.Worker operation
The proficiency of workers' operation is also an important factor affecting the oil yield. During the pyrolysis process, multiple parameters such as pyrolysis temperature, pyrolysis time and condensation effect need to be controlled, and the control of these parameters depends on manual operation. If the operator lacks experience or is not proficient in operation, it may lead to inaccurate parameter control, thus affecting the oil yield. For example, too high or too low pyrolysis temperature will result in incomplete pyrolysis or the production of too many by-products, thus reducing the oil yield. Therefore, improving the proficiency of operators is of great significance for increasing the oil yield.
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