Pyrolysis is a thermochemical process that occurs under non-oxidising conditions. Essentially it is a method that decomposes organic material by heating it. In the context of waste treatment, the process of pyrolysis transforms the polymer structure of waste into a range of recyclable and useful products.
Continuous pyrolysis plant working principle Continuous pyrolysis plant is fundamentally different from the traditional batch process. The traditional batch process includes charging, heating, cooling and discharging. While the working principle of the continuous pyrolysis plant is: feeding materials are always sent into the reactor during working period and the syngas and carbon balck are always discharged during working period, too. Therefore, there is no time for stagnation during the working period.
Temperature control is crucial to pyrolysis plant efficiency. General speaking, tire pyrolysis plant works well when temperature ranges from 350 to 500 degrees. Too low temperature, the tire does not fully breakdown into components. Too high temperature, the tires will burn in the plant, resulting in lower quality and less amount of pyrolysis products. Pressure control in pyrolysis plant is also vital for efficient vapor flow and plant structure.
The reactor is the central component of a continuous pyrolysis plant. New designs feature rotary chambers or moving beds in order to ensure a homogeneous heating. Thanks to the design of the reactor, the material does not agglomerate and is therefore in good thermal contact. In new reactor concepts, multiple heating zones are often implemented.
A condenser system of the apparatus for converting solid waste into oil comprises a gas cooler, an oil droplet former, a first cooler, a second cooler, a cooling water tank, and valves for connecting any desired cooler to the condenser system. In the condenser system of the invention, the vapour produced from the pyrolysis of solid waste in the apparatus is cooled and condensed into oil using the gas cooler and oil droplet former so that the resultant condensate is divided into several fractions by multi-stage cooling using the first and second coolers and the cooling water tank and the oil fractions are collected separately. It is particularly effective in collecting heavy oils in high temperature conditions of the primary condensers and in increasing the yield of light oils by cooling the vapours to be condensed in the secondary condensers to a low temperature.
The storage tanks for oil need to be coated with special corrosion resistant paints to handle the highly corrosive nature of pyrolysis oil. Temperature control system is required to store the oil in the required storage temperature. Automated sampling system is provided to sample the oil quality without manual intervention.
The gas recycling system allows non-condensable gases that have been produced to be re-used as an energy source. It can include purification stages. The pure and clean gases that are produced are recycled back into the reactor, this therefore lowers the consumption of the fuel used to heat the reactor. Thus improving the overall efficiency of the plant and lowering the operating cost.
Recent developments are centered around automation and process optimization. Advanced smart control allows for monitoring and control of a multiplicity of parameters. Advanced Machine Learning techniques allow for on the fly adjustment of process parameters to suit any changes in the feedstock material. Remote access allows for on the fly expert support to operators, many times obviating the need for on site attendance.
Every year, more than 1.5 billion end-of-life tyres are generated worldwide. Tyre waste is an increasingly serious global issue that carries high environmental and social risks. The current practices for disposing of tyres are not sustainable and they can contaminate ecosystems and human health for centuries to come.
The most common method of disposal worldwide is landfilling. Landfilling whole tires can create cavities or voids in the landfill that can compromise its structural integrity. These cavities can fill with water and become breeding grounds for pest vectors. Tire fires in landfills can burn for weeks or even months and release toxic fumes that can negatively affect both local air and soil quality.
Illegal dumping occurs when non-hazardous solid waste is disposed of in unauthorized areas such as in streams, rivers, forests, wildlife refuges, parks, or anywhere else other than at approved and designated dump sites. Some examples of illegal dumping impacts on the environment: Abandoned tires may fill an area, collecting water, providing a breeding ground for mosquitoes. Remote sites can leach toxins into the soil and groundwater, for years after the original waste has been deposited. The cost of waste properly being removed is paid for either by the private landowner or taxpayer.
Continuous pyrolysis plant for used tires The used tires after recycling by continuous pyrolysis plant will greatly reduce the amount of landfill. About one ton of used tires can produce about 400-450kg pyrolysis oil. The oil can be used as fuel for industrial use. And about 350-400kg carbon black can be obtained from the continuous pyrolysis plant for used tires.
Carbon black will be sold to rubber manufacturers and paint and ink producers. In addition, steel wire recovered from the system will generate extra income. While mixed scrap metal is sold at a low price, clean steel wire can fetch a higher price. In addition, the gas produced will be used as fuel in the system and may also be sold.
One of the most sustainable aspects of continuous pyrolysis plants are the energy recovery aspects. Self-sustaining in terms of energy, the gas produced in the process is re-used and there is always surplus energy available. This surplus energy can be used for further processing of the pyrolytic products, or it can be sold to the grid. This results in a better ecological footprint compared to landfilling.
Modern plants use sophisticated and expensive Emission control systems in order to achieve better air quality. Typically, these systems include scrubbing systems for the removal of sulphur compounds and particulates, and activated carbon filters for the removal of residual organic vapours. They all are based upon current legislation for air pollution control.
Operating costs for a continuous pyrolysis plant is much lower than that of other methods of waste disposal. Tipping fees at landfill sites are increasing on a worldwide basis due to lack of available landfill space and rising transportation costs. Our continuous pyrolysis system eliminates these recurring costs while producing revenue.
Labor requirements for continuous systems are lower than for batch processes. Automatic feed systems also minimize labor required to move waste into the system. The fixed costs associated with infrastructure and operation are also more spread out due to the increased throughput of continuous systems.
Primary benefits are associated with cost savings, but long term financial benefits are also gained by considering the future benefits arising from higher product sales. Product sales provide significant positive cash flow to reduce the capital investment required on any new system. Increased profit is also derived from lower energy costs, from metal produced using recycled gas, and ultimately from the sale of carbon credits.
Pyrolysis oil demand grows across multiple industrial sectors. Cement plants use pyrolysis oil as alternative fuel sources. Steel mills substitute pyrolysis oil for conventional heating fuels. Power generation facilities blend pyrolysis oil with other fuel sources.
Carbon black markets continue to experience strong demand fundamentals. The rubber industry continues to support carbon black pricing through robust demand. The niche or specialty products command a higher margin due to the need for a higher quality product. Paint and ink manufacturers also remain interested in using recycled carbon black.
Steel wire recovery is an opportunity where profit can be generated right away. Our clean separation technology allows for the production of high quality steel products in form of wire. Many automobile recycling centers buy steel wire that we have recovered. Also in the construction sector there are numerous applications.
Gas sales opportunities exist in regions with established infrastructure. Industrial customers value consistent gas quality and supply. Combined heat and power applications maximize gas utilization efficiency. District heating systems can utilize excess thermal energy.
As part of our ongoing development activities, we have made several design improvements to our reactors centered around heat transfer. We have introduced new grades of refractory materials which enable higher operating temperatures and allow for greater number of thermal cycles. Additionally, we have re-designed the heating elements within the reactors in order to optimise temperature profiles. The effects of these design improvements are that we are able to significantly increase reactor output and at the same time preserve product quality.
Automation technologies transform plant operations and safety profiles. Programmable logic controllers manage complex process sequences. Human-machine interfaces provide intuitive operator control systems. Safety interlocks prevent equipment damage and ensure worker protection.
We provide Predictive Maintenance services using sensor networks and data analytics. Vibration monitoring can be used to detect any bearing wear before it becomes a problem that requires maintenance. Temperature trending allows us to see patterns of heating element failure. Predictive Maintenance reduces unplanned down time and reduces the amount of money required for routine maintenance.
Emerging technologies promise further efficiency improvements and cost reductions. Microwave-assisted pyrolysis offers precise heating control and faster processing. Plasma pyrolysis enables processing of mixed waste streams. These technologies may expand feedstock flexibility and product options.
Artificial intelligence integration enables autonomous plant operations. Machine learning algorithms optimize operating parameters continuously. Predictive analytics forecast maintenance requirements and production schedules. These capabilities reduce operating costs and improve plant reliability.
Modular design configurations allow for quick deployment and easy scalability. Pre-engineered modular components minimize manufacturing costs and reduce assembly time. Transportable units can be used to address the needs of off-grid and mobile applications.
For the continuous pyrolysis plant, the design is done very well, which can work for 15-20 years after maintenance. The materials, operating condition and maintenance are related to the working life of the equipment. Generally speaking, the high temperature components require more frequent replacement, while the structural components are longer lasting.
The reactor linings must be replaced after 3-5 years, depending on the operational conditions of the system. The heating elements can also be expected to have a relatively short lifetime of about 2-3 years in continuous operation. It is also standard for the system to require replacement of the mechanical equipment such as motors and pumps, following standard industrial expectations.
Preventive Maintenance extends the life of your system. Regular maintenance performed on a consistent basis helps to extend the life of your system and also helps to prevent unexpected failures or outages. Daily Walk-Through inspections help to identify and fix problems before they become major issues. Scheduled Preventive Maintenance ensures that wear parts are replaced before they become a problem. Proper Operator Techniques will help to eliminate unnecessary stress on the system and therefore help to prolong the life of the system.
Modern continuous pyrolysis units use advanced gas emissions control systems, comprising multiple scrubbing stages for efficient removal of acids and particles. Using thermal oxidation treatment, all uncondensed hydrocarbons are burnt in the incineration sections prior to their release into the atmosphere.
Activated carbon filters provide final polishing for trace organic compounds. Continuous emission monitoring systems track pollutant levels in real-time. Automated control systems adjust operating parameters to maintain compliance with air quality standards.
It is company policy to operate within the local and national emissions limits, as laid down in the Environmental Permits which details the parameters to be measured and the frequencies of the reports required. Stack testing has to be performed in a predetermined frequency to ensure that the abatement efficiencies of the pollution control systems in place are still intact. This ensures that any damage to the environment from the station’s operations is kept to a minimum.
Continuous pyrolysis plants can recycle most common varieties of tyres. From passenger vehicles to trucks, off-road tyres, etc. The differences in their chemical structure can lead to some variations in terms of the yields of products, but do not represent an obstacle for the recycling of the tyres.
Different tire types present unique challenges in terms of wire separation in recycling operations: Steel-belted radial tires need to be processed effectively; larger run-flat tires are often need to be size reduced before they can be recycled; and agricultural tires with large tread depths can benefit from a longer retention time in the recycling system. Changes to operating conditions are relatively easy to achieve and do not require equipment upgrades.
Pre-treatment of tyres depends on the condition of the tyres and the plant design. For whole tyre processing no cost is involved for size reduction. Shredding the tyres improves the handling characteristics and could improve the heating uniformity. Cleaning is required to remove dirt and other debris that may impact the final product quality.
