How to reuse plastic products?
Initially, plastic recycling was largely landfill or incineration, resulting in substantial waste of resources. Therefore, foreign waste plastics are used for blast furnace injection instead of coal, oil and coke. It is used for cement rotary kiln instead of coal, firing cement, and making solid waste fuel (RDF) for power generation, the effect is ideal.
Garbage solid fuel power generation was first used in the United States, and has 37 RDF power stations, accounting for 21.6% of the garbage power stations. Japan has realized the great potential of waste plastics power generation. Japan has combined with the overhaul stand to RDF production station some small waste incineration, in order to focus on continuous high scale after power generation, so that the steam parameters of the rubbish power plant is increased from 30012 to 45012, the power generation efficiency is increased from 15% to 20%~25%.
RDF technology was originally developed by the United states. In recent years, Japan's view of landfill shortage, incinerator waste plastics processing HCI of boiler corrosion, and combustion process will produce dioxin pollution of the environment, the use of waste plastics and the characteristics of high calorific value of mixed combustible waste into uniform heat 20933kJ/kg and particle size of the RDF, even if the chlorine has been diluted, at the same time also it is easy to store and transport and for other boilers and industrial furnaces burning coal.Blast furnace injection of waste plastics technology is also the use of waste plastics high calorific value, waste plastics as raw materials, made suitable for spraying into the blast furnace size, instead of coke or coal powder, a new method of dealing with waste plastics. Foreign blast furnace injection of waste plastics showed that the utilization rate of waste plastics reached 80%, the amount of emissions was 0.1%~1.0% of the incineration, less harmful gas produced, lower processing costs. The technology of injecting waste plastics into blast furnace has opened up a new way for the comprehensive utilization of waste plastics and the control of "white pollution". It also provides a new way for energy saving and efficiency improvement in metallurgical enterprises. Germany and Japan have been successful since 1995.
So far, the packaging industry is still China's plastics industry's largest application areas. Experts predict that 2005 plastic packaging will grow by more than 15% year on year, reaching 6 million 250 thousand tons. Compared with the continuous increase in the amount of applications, the recycling of plastic packaging in China is far from optimistic. Waste plastic recycling applications narrow, can be described as a major obstacle to the development of recycling. This issue introduces some main technologies of waste plastics recycling at home and abroad.
