إتقان التحلل الحراري لإطارات النفايات دليل شامل لتكرير النفط

From a technological perspective, both the entire tire and the cut tire can be directly put into the furnace for production. However, in practical applications, whether for transportation needs or during loading of the main furnace, it is desirable to compress the volume of waste tires as much as possible in order to load more waste tires in the limited mainstream space.

So what is more common on the market now is tire cover, which involves cutting off both sides of the tire and putting the part in contact with the ground in the middle together as the tread. This way, the original position where one tire was placed could potentially accommodate six to seven, or seven to eight tires, thus maximizing the use of the space inside the main furnace; It is also more convenient to load materials through machines or manual loading.

Dioxins are mainly caused by the presence of chlorine sources and incomplete combustion in substances. Oxygen, chlorine, and metal elements are essential conditions for the formation of dioxins. Among them, chlorine sources (such as PVC, chlorine gas, HCl) are precursors for the production of dioxins, while metal elements (such as Cu, Fe) are catalysts for the production of dioxins. When the combustion temperature is below 800℃ and the residence time of the flue gas is less than 2s, some organic matter in the combustion material will react with molecular chlorine or chlorine free radicals to produce dioxins.

The temperature of the pyrolysis process designed by our company is between 200~450℃, and the pyrolysis process is in an oxygen-deficient environment, not combustion; The waste tires of large or small vehicles used for pyrolysis do not contain organic or inorganic chlorine (additives used in tire production do not contain chlorine, and rubber is mainly made of natural rubber and synthetic rubber, both of which are non chloroprene rubber); At the same time, there are no metal cations as catalysts, so the pyrolysis process does not have the conditions to generate dioxins, which is very environmentally friendly.

Temperature: Temperature not only affects the pyrolysis process, but also the proportion of pyrolysis products. When the temperature is low, it can reduce the occurrence of secondary reactions of large organic molecules, generate more molecular chains above C5, and increase the oil content. As the temperature increases, while large molecules continue to pyrolyze, small molecules also undergo secondary polymerization reactions, resulting in an increase in olefin gases, a decrease in oil content, an increase in combustible gases. In addition, the composition of carbon black gradually decreases with the increase of temperature.

Temperature rise rate: The influence of temperature rise rate on pyrolysis is mainly reflected in the composition ratio and productivity of pyrolysis products, because the increase of temperature rise rate directly affects the mass transfer rate of pyrolysis products. Generally speaking, when the temperature rise rate is high, the pyrolysis time of waste rubber is short, and the proportion of gas in the pyrolysis product composition is relatively large, while the proportion of solid carbon black and oil is relatively small. In the case of low temperature rise rate, the pyrolysis time of waste rubber is long, and the organic matter at the beginning of pyrolysis will combine with each other to form stable solids, increasing the solid income rate.

Pyrolysis time: The longer the pyrolysis time, the longer the residence time in the pyrolysis chamber, and the more thorough the pyrolysis reaction, but the lower the pyrolysis efficiency; Moreover, the residence time in the pyrolysis chamber is relatively long, which increases secondary reactions and is not conducive to improving the quality of pyrolysis products.

Rubber size: If the size of the waste rubber is small, the heating area during the pyrolysis process is large, the heat transfer rate is fast, the pyrolysis reaction rate increases, and the pyrolysis will be uniform; If the size of waste rubber is large, the heat transfer rate is low, the pyrolysis time is long, the secondary pyrolysis reaction is easy to increase, and the pyrolysis effect will be poor. Therefore, in order to obtain better pyrolysis products, a shredder is usually used to shred the waste rubber first.