The yield of pyrolysis tires can vary significantly depending on several factors.
These factors include the type of tire and the specific conditions of the pyrolysis process.
4 Key Factors to Consider
1. Type of Tire
For large car tires, truck tires, and OTR (Off-The-Road) tires, the oil yield is typically between 45% and 52% of the tire's weight.
Smaller tires, such as those from cars, motorcycles, and bicycles, yield slightly less oil, around 35% to 40%.
Other rubber materials like rubber cable sheaths and soles yield about 35% oil, while various rubber sheets or carpets yield about 30% oil.
2. Pyrolysis Process
The pyrolysis process involves heating the tires in the absence of oxygen to break down the rubber into various products.
The main products include pyrolysis oil, carbon black, steel wire, and gas.
The specific yields for these products from a ton of tires are approximately 300kg of pyrolysis oil, 380kg of carbon black, 170kg of steel, and 150kg of gas (with about 40% methane content).
3. Heating Rate and Temperature
The quality and yield of the products are influenced by the heating rate and temperature.
For instance, maintaining a temperature around 450°C primarily produces liquid hydrocarbons.
Temperatures above 700°C favor the production of synthetic gas (syngas) due to further cracking of the liquids.
4. Tire Preparation
The process also varies depending on whether the tires are used whole or shredded.
Whole tires contain fibers and steel, which can affect the final product yields and qualities.
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