Pyrolysis is the chemical process of separating materials into their constituent parts. The word is coined from the Greek-derived elements pyr “fire” and lysis “separating”. Essentially pyrolysis involves the rapid thermal decomposition of compounds under pressure at high operating temperatures in the absence of oxygen to produce liquids. Greenline`s continual waste plastic pyrolysis technology and production process uses state-of-the-art advanced engineering to reclaim oil from waste plastic feedstocks and yield high quality liquid fuel oils (gasoline & diesel).
Plastic is originally produced as one of the by-products of crude oil refining and the pyrolysis process returns plastic to its constituent parts including refinement back into a hydrocarbon fuel. The fuel produced by pyrolysis can be utilized for common applications, such as fuelling slow stroking motors or motor vehicles or the generation of electricity and usually fuel produced is a low grade diesel together with some paraffin but with additional refinement a quality automotive grade fuel is possible.
The pyrolysis production system comprises seven process units:
Firstly, reclamation of un-cleaned plastic is undertaken and all solid and metals removed by way of magnetic separators and hand sorted. Plastics are continuously fed into a shredder and are shredded at approx. 100mm2, and then conveyed to hopper as direct feed or baled and stored.
The shredded plastic is then pre-heated in the pyrolysis unit into liquid. During this part of the process the plastic is pyrolysised. The low-melting point plastic PVC is the first plastic treated and the resulting production of HCL is treated and removed, this phase of the process also treats all the products of the other plastics at a slightly higher temperature and the non-pyrolysised by-products are then reduced to neutral innocuous material.
The now liquid plastic, after being preheated is fed to the pyrolysis reactor on a continuous basis. Inside the reactor, the plastics will initially react with the heat-conductive medium.
The exhaust gas produced will then be routed to the re-heater and come into gas catalyst fixed bed. The heavy oil component will have second time pyrolysis. After fractionation, the gas will convert into diesel crude and then separately be transported to oil storage tanks.
The incondensable gas produced in pyrolysis system will be supplied as the heating source of heating system after clarification.
The remainder waste residue will be discharged with the solid heat-conductive medium. The waste residue after separation and concentration will be collected and treated to produce a totally inert material. (the waste residue can be compressed into architecture material).
After exhaust gas burning, any residual grain size solids report to a dust collection unit and cleaned. Any residual gas component will be absorbed by way of active carbon. The subsequent emissions will fully comply with all known emission indices.
This waste plastics continual pyrolysis technique and equipment achieves continual industrial production and auto-immunization.
The whole system is safe, environmentally protective and is highly efficient.
The pyrolysis process is illustrated below: