'Energy utilization' has become an important way of large-scale recycling of waste plastics. At present, China's technology in this area is gradually becoming mature.
According to reports, the direct recycling of plastics, the main technology is concentrated in three aspects, one is the direct recycling of plastics, through recycling and reuse or modified regeneration technology, wood plastic technology, adding new components, so that plastic has new features. On the one hand, the thermal cracking of plastic film is used to produce fuel oil. In fact, the plastic is heated, catalyzed and cracked to produce fuel oil. Supercritical water splitting technology has a high starting point, high efficiency but high cost. Industrialization. Finally, the use of plastic as an auxiliary fuel can be used blast furnace injection technology, waste plastic and coal co-evolutionary technology, but only to solve a small part of the problem.
'The waste plastic film has a large amount of production, and the pollution is serious. Special attention should be paid. The technology of thermal cracking of waste plastic film to produce fuel oil has the most engineering prospects.'
How to solve the problem of waste plastics has a very clear path in the industry: 'where does it come from and where does it go'. Plastic is a petroleum product and it is restored to oil. This is a real cycle. From the middle of the 20th century to the mid-1980s At the beginning, there were countless agencies and individuals in China to explore and study the issue of 'oiling' of waste plastics, but it was impossible to break through for a long time.
Why is this closed loop so difficult to form? 'This is a directional problem.' Li Yong introduced that in the past using dry distillation technology, low oil output and not environmentally friendly, unsafe. Finally found that the oil cracking process, through heating, cracking can be Waste plastics are completely catalytically cracked into steam, diesel, and kerosene, but they hit a 'stopper.' The raw material used in the petroleum cracking system is crude oil, which is a medium for production, and plastic is a solid medium, and solid media cannot be incorporated into a liquid medium system.
At present, a team in China has overcome the difficulties for nine years and invented the technology of flexible plasticization of waste plastics. Currently, this technology has officially landed in Zhuozhou, Hebei, and the first industrial production line has passed the environmental impact assessment. After completion, 300 tons of waste plastics will be processed daily. It is planned to build oil in 2019.
The cost of 1 ton of white garbage to make oil is up to 500 yuan, and about 0.8 ton of oil can be produced. A ton of oil can be sold for about 4,000 yuan. A production line that can process about 300 tons of white garbage daily can only meet 200-300. The amount produced by a city of a million people. 'The responsible person counted a sum for the technology to recycle waste plastics.
The research and development of emerging waste plastics energy utilization technology and equipment, and the industry norms and standards for energy use and utilization are all urgently needed to be supported and established. We also expect that waste plastic energy can be developed in an orderly, professional and standardized manner.