Three applications of recycling waste plastics

2022-08-11
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The recycling of waste plastics is a major and arduous task. Compared with metal recycling, the biggest problem of plastic recycling is that it is difficult to classify automatically by machine, and the process involves a lot of manpower. It is reported that in 2013, China recycled about 28million tons of waste plastics. The resistance of imported waste ⑤ rubber springs to transmit sound is much greater than that of metal springs, and about 8million tons of plastic. After recycling, it is equivalent to saving 216 million tons of oil

the recycling rate of waste plastics in China has increased from about 20% before 2010 to more than 30% today. At present, there are more than 3000 waste plastic processing enterprises in China. Related industrial parks, characteristic industrial parks and high-tech parks that have been built or are under construction have replaced wood and metal materials in some fields, and there are 29 eco industrial parks. The level of recycling technology and environmental protection is also improving year by year, forming a community-based recycling site and a sorting and processing center as the node, An industrial chain with a large renewable resource recycling base as the hub

it is estimated that recycling 1 ton of waste plastic is equivalent to saving about 6 tons of oil. Statistics show that during the "Eleventh Five Year Plan" period, a total of 46million tons of waste plastics were recycled in China

three applications of waste plastic recycling

recycled materials

with the rise of global crude oil prices, the price of plastic products, one of the oil derivatives, has naturally risen, and the recycling of waste plastics has also been mentioned as the primary position. The recycling of waste plastics has been widely adopted by modern chemical enterprises. After manual screening and classification, waste plastics will also undergo crushing, granulation, modification and other processes to become various transparent and opaque plastic particles, which will be classified according to the product phase, and finally become recycled materials that can be reused

fuel

initially, plastic recycling was largely landfilled or incinerated, resulting in a huge waste of resources. Therefore, foreign countries use waste plastics for blast furnace injection instead of coal, oil and coke, for cement rotary kiln instead of coal to burn cement, and for making garbage solid fuel (RDF) for power generation, the effect is ideal

rdf technology was originally developed in the United States. In recent years, in view of the lack of landfills in Japan, the serious corrosion of HCI on boilers when incinerators deal with chlorine containing waste plastics, and the environmental pollution caused by dioxin during the combustion process, using the characteristics of high calorific value of waste plastics to mix various combustible wastes to make RDF with calorific value of 20933kj/kg and uniform particle size, even if the chlorine is diluted, it is also convenient to store, transport and burn coal substitute for other boilers and industrial kilns

blast furnace injection of waste plastics technology is also a new method to treat waste plastics by using the high calorific value of waste plastics to make waste plastics into suitable particle size and inject them into the blast furnace to replace coke or pulverized coal. The application of waste plastics injected into blast furnaces abroad shows that the utilization rate of waste plastics is up to 80%, the emission is 0.1%-1.0% of the incineration amount, the harmful gas produced is less, and the treatment cost is low. The technology of injecting waste plastics into blast furnace opens up a new way for the comprehensive utilization of waste plastics and the treatment of "white pollution", and also provides a new way for metallurgical enterprises to save energy and increase efficiency. Germany and Japan have been successfully applied since 1995

power generation

garbage solid fuel power generation was first applied in the United States, and there are 37 RDF power stations, accounting for 21.6% of garbage power stations. Japan has realized the great potential of waste plastics for power generation. In combination with the overhaul, Japan has changed some small waste incineration stations to f production stations on the occasion of the 50th anniversary celebration of the plant, so that continuous and efficient large-scale power generation can be carried out after concentration, so that the steam parameters of waste power stations are increased from 30012 to about 45012, and the power generation efficiency is increased from the original 15% to 20%-25%

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