The increasing amount of post-industrial plastic waste in urban environments has become a serious problem that we need to solve. Production processes discard materials as waste during the manufacturing stage and packaging. This includes rejected or faulty products that cannot return to the market. Although we currently send many of these wastes to landfills, the quantities involved are often so large that the landfill infrastructure soon cannot handle the sheer volume of material. Rather than facing a simple problem of waste disposal, most of this material represents a lost product that we have retrieved from the supply chain. We could recover and recycle it, allowing it to re-enter the manufacturing cycle.
From a chemical perspective, plastics are highly persistent and remain in the environment for centuries, entering the urban environment in the form of microplastics. To deal with this problem it is necessary to move from a linear approach to waste management and to set up recovery systems capable of processing the large quantities of material generated by manufacturing processes while at the same time ensuring no environmental impact.
Waste management has evolved from manual and semi-automatic pyrolysis processes to fully automatic waste plastic pyrolysis plants designed for large-scale production. Unlike manual or semi-continuous models, the fully automatic pyrolysis plant integrates an advanced PLC control system for continuous and automatic monitoring of various reaction parameters including temperature, pressure and oil yield rate.
All processes in the plant, including material feeding and oil product unloading, operate completely automatically. This automation enables the plant to run 24/7 and achieve a high daily production of 2000-3000L. On the other hand, a fully automatic pyrolysis plant is equipped with sealed tanks and closed structures. Therefore, the plant produces no gas leaks during operation. This allows it to fulfill safety and environmental requirements.
PP and PE are common plastics found in a large percentage of industrial waste streams. To set up an appropriate waste management system for these plastics, one must first establish a process of collection and purifying the sorted plastics. PP and PE have very high oil yields through thermal cracking making them desirable as a plastic feedstock. Storage silos and transport containers must be set up to maintain separate storage of PP/PE from other plastics like PVC and PET that can produce hazardous byproducts during pyrolysis. Separating these specific polymers from other mixed waste streams allows for consistent high quality feedstock collection and the long term health of the pyrolysis reactor and output.
The core value of the pyrolysis process lies in its ability to transform low-value waste polymers into high-calorific fuel oil. Through the process of thermal decomposition in an oxygen-free atmosphere, long-chain polymer molecules are broken down into smaller hydrocarbon chains. This resulting oil typically possesses a high heating value, making it an excellent substitute for heavy industrial fuel or a feedstock for further refinery. The efficiency of this conversion depends heavily on the catalyst and the precision of the temperature control. This allows the product to be used in boilers, furnaces, or even diesel generators after distillation.
Our company has finished installing and commissioning waste plastic pyrolysis plant in famous industrial park in Southeast Asia recently. This site for waste plastic pyrolysis plant is very large, and it is very convenient for shipping in. There is specialized and efficient plastic crushing system, with high quality automatic plastic feeding system, which can send the raw material materials into reactor without breaking vacuum. For getting high quality oil yield, we install multi-stage condenser on pyrolysis plant. By using multi-stage condenser, we can separate different oil fraction on different boiling point. And most importantly, front-end processing is very important in the whole process. It requires the raw material size in 5-8mm, which can achieve to the best heat transfer efficiency in pyrolysis reactor and get the best pyrolysis oil yield and complete decomposing of plastic polymer chain.
The Southeast Asian project has been running smoothly and efficiently since commissioning. It has maintained a continuous running operational cycle, processing more than 20 tonnes of waste plastic on a daily basis. The cooling system, which comprises a series of tanks in multiple stages, effectively performs the needed operations to achieve a high oil conversion rate and reduce the residual content. The reaction process produces non-condensable gases, and we reuse these gases as fuel to generate heat in the reactor. This means the plant has no need for external energy supply. Moreover, the exhaust gas treatment system has demonstrated excellent performance in removing pollutants and fully complies with local environmental standards. Therefore, the facility operates in an environmentally friendly manner, and our neighbours in the industrial park well receive it.
The waste plastic pyrolysis plant investment return is mainly from pyrolysis oil, carbon black and waste recycling service charge. With the increasing prices of traditional energy resources, the high-calorific pyrolysis oil is very competitive in local market for diesel power generator fuel. The initial investment for the project can get back quickly due to very low operation costs which mainly depend on automated pyrolysis working process and self-generated combustible gas. Most of government policies are in favor of renewable energy and waste recycling projects. As a result, the payback period for such projects can be reduced to only a few years to make profit soon.
pyrolysis has the potential to make the manufacturing industry more sustainable. Pyrolysis can convert plastic or other waste into fuel on the same premises as production, significantly reducing the carbon emitted by long distance haulage of waste and by incineration in dedicated facilities. The ‘closed loop’ process for carbon means it does not release carbon into the atmosphere as greenhouse gases. Also, it reduces the need to source more oil from fragile sources. At the same time, it turns old waste streams into strategic assets.
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