Used Tire Refining Equipment

The Qingdao Dehui Xin advanced thermal cracking equipment for scrap tires has broken through the bottleneck of continuous production in the thermal cracking of scrap tires. It innovatively employs intelligent control technology, high-temperature hot air temperature control technology, granule feeding sealing technology, and carbon black discharge sealing technology, solving the global challenge of oxygen-free cracking of furnace powder and oil-gas cooling congestion.

This technology boasts independent intellectual property rights, with its process flow and complete technical equipment featuring intelligent operation convenience and strong production and processing capabilities (approximately 100 kg of rubber powder processed per line daily).50 tons), low operation costs for equipment, outstanding comprehensive economic benefits, and superior cost-performance ratio of complete sets of equipment. Achieved "zero pollution" and full industrial chain utilization of waste tires, and achieved the purpose of "utilizing to the fullest" in recycling.

One, Process flow diagram of thermal cracking equipment

Section Two: Description of Pyrolysis Equipment Process

Cracking process is divided into cracking furnace inlet operation, cracking furnace system, cracking furnace outlet operation, heating system, and oil-gas condensation system.5 processes.

Cracking furnace inlet process

The pellets are conveyed to the hoist position by a belt conveyor, where the hoist feeds them into the receiving bin. The receiving bin is equipped with upper and lower level controls for the conveyor, stopping the belt conveyor when the material level exceeds the set upper limit and starting it again when it falls below the set lower limit, ensuring the material level is always ideal. Then, a vacuum feeding unit supplies the pyrolysis furnace with airless pellets.

2. Cracking furnace system

The cracking furnace system consists of three levels: upper, middle, and lower cracking. The granules are evenly fed into the cracking furnace through the inlet process, where they are heated and cracked. A burner supplies hot air to the cracking furnace, and precise control of the furnace temperature is achieved by adjusting the size of the flame and the on/off of the burner. The granules inside the reactor start to soften and crack until they carbonize upon heating.

The cracking furnace system operates using a vacuum system, with the internal pressure controlled by adjusting the fan speed. The complete sealed system provides an anaerobic cracking environment for the granules, ensuring both safety and energy savings, as well as an increased oil yield. The entire system is leak-free, ensuring no odors on-site and a pollution-free environment.

3. Cracking furnace export process

The raw carbon black produced by pyrolysis, with a temperature exceeding 400°C, is transported to the carbon black packaging workshop via a screw conveyor. The conveyor is equipped with a water-cooling system to cool the raw carbon black to below 50°C. The cooled, solid raw carbon black is then conveyed by a screw lifter to a magnetic separator for iron removal. The iron content in the pyrolytic carbon black is approximately 2%, and it must be completely purified before entering the carbon black powdering and packaging process to ensure the purity and quality of the carbon black product.

4. Heating System

The system is heated by a combustion unit, and a thermocouple is installed on the furnace body, which provides real-time temperature readings to the control center. The combustion unit's fuel is the gaseous product from pyrolysis, with natural gas as the energy source for the initial use.

The furnace's thermal induction feedback to the control console allows for real-time adjustment of the burner's flame size and on/off, ensuring precise control of the furnace temperature. Accurate temperature control in the cracking furnace can result in increased oil yield and improved oil quality.

Hot air from the heating or jacket is supplied to the dryer system of the granulating equipment, and then vented after desulfurization and denitrification.

5. Oil and Gas Condensate System

Crude oil and gas enter the condensation system from the cracking furnace, first passing through the collision oil and gas separator. Through the collision effect, heavy oil sludge condenses at the bottom of the tank, improving the finished product quality. The gas post-separator flows into a tubular shell condenser, which has a large contact area, excellent condensation performance, and is less prone to clogging, allowing for long-term operation. The condensed finished oil is then transferred to an interim storage tank. The combustible gas is extracted from the top of the interim storage tank and fed into the gas holder, subsequently supplied to the burner. The interim storage tank is equipped with an oil level sensor, and when it reaches the set position, the oil pump is activated to pump the oil into the storage tank.