With the increasing consumption of plastic products, plastic waste is also increasing. At present, plastic waste in China are mainly plastic film, silk and woven goods, foam, plastic crates and containers, household plastic products, plastic bags and agricultural film, etc. In addition, the annual consumption of automotive plastics has reached 40 million tons, annual consumption of home electronic appliances reached 100 million tons, these products has become an important source of waste plastics, waste plastics recycling can not delay, here are the main form of waste plastic recycling:
1 Recycled materials
With increased prices of global crude oil, one of the plastic derivative naturally have gone up, waste plastics recycling has also been referred to the primary position. Waste plastics recycling has been widely used in modern chemical industry. After the screening of waste plastic artificial classification, but also through crushing, granulation, process modification, into a variety of transparent plastic pellets, and then classified according to product phase, and finally become able to use recycled materials again.
2 Fuel
Initially, the extensive use methods of plastics recycling are landfill and burning, causing a huge waste of resources. Thus, foreign waste plastics for blast furnace injection instead of coal, oil and coke, cement rotary kiln for firing cement instead of coal, as well as made of solid refuse fuel (RDF) for power generation, the results are satisfactory.
RDF technology was originally developed in the United States. In recent years, the Japanese view of the lack of landfills, incinerators, chlorine-containing waste plastics processing HCI serious corrosion on the boiler, and the combustion process will produce dioxin pollution of the environment, and the use of waste plastic characterized by high heating value of various mixed combustible garbage into heat 20933kJ / kg and uniform size of RDF, even chlorine to give
Diluted, but also to facilitate storage, transport, and for other boilers, industrial furnaces burning coal generations.
Waste Plastics Injection technology is the use of high calorific value of waste plastics, waste plastics as a new method suitable size raw material is injected into the blast furnace to replace a coke or coal processing waste plastics. Foreign Waste Plastics Injection application shows that waste plastics utilization rate of 80% and emissions by 0.1% to 1.0% of the amount of burning, produces less harmful gas, lower processing costs. Waste Plastics Injection technology for the comprehensive utilization of waste plastics and governance “white pollution” has opened up a new way, but also for energy efficiency metallurgical enterprises provides a new means. Germany, Japan has been successfully applied since 1995.
3. Generation
Garbage solid fuel power generation firstly applied in the United States, and there are 37 RDF power plants, accounted for 21.6% of garbage power plant. Japan has realized the enormous potential of waste plastics generation. Japan has been combined with a number of small waste incineration overhaul station to station RDF production to focus on continuous and efficient after-scale power generation, garbage power plant steam parameters is from 30012 to around 45012, power generation efficiency is 15% to 20% -25%.