A kind of high-efficiency utilization method of waste plastic granules

Abstract

The invention discloses a high-efficiency utilization method of waste plastic granules. During smelting in a converter or an electric furnace, the waste plastic granules are added as raw materials into the converter or an electric furnace, and the ratio of the amount of waste plastic granules to scrap steel is (0.1-1) Ton: 1 ton; pyrolysis of waste plastic particles will produce H 2 , CO gas and carbon black, pyrolyzed carbon black can react with oxygen in smelting molten steel to generate carbon monoxide and release heat energy, while H 2 , CO gas can be used as energy recovery, reducing environmental pollution; the present invention fully utilizes the potential resource of plastic waste, solves the problem of huge waste of plastic resources and the harm to the environment, and at the same time improves the output and quality of recovered converter gas The gas recovery per ton of steel increases by 15-22%, the unit calorific value increases by 15-25%, the energy saving is 10-30%, and the market prospect is broad.

Description

technical field [0001] The invention relates to a method for utilizing waste plastics, in particular to a method for efficiently utilizing waste plastic particles. Background technique [0002] Converter steelmaking occupies a dominant position in my country's steelmaking process, and its by-product, converter gas, is an important secondary energy source for iron and steel enterprises, and its recovery accounts for 80%-90% of the total energy recovery in the entire steelmaking process; therefore, improving The quantity and quality of converter steelmaking gas recovery is conducive to increasing the efficiency of steelmaking and effectively reducing the greenhouse gas CO 2 emission, which is of great significance to the sustainable development of iron and steel enterprises. [0003] At present, my country's converter gas recovery is still at a relatively low level, and there are generally low gas recovery rates, low CO content in recovered gas and CO 2 , O 2 high content is...

AI Technical Summary

Problems solved by technology

[0006] However, the recycling of waste plastics requires that the composition of waste plastics is relatively single and pure, so that the quality and reuse value of recycled plastics can be fundamentally guaranteed; waste plastics recycling technology is an important aspect of resource utilization and harmless treatment of waste plastics. The means and methods have good social, environmental and economic benefits, but because the technology has high requirements on raw materials, it is often difficult to achieve large-scale production

[0007] In order to solve the problem that it is difficult to achieve large-scale production of waste plastics recycling, scientists have invented waste plastics thermal decomposition and oilization technology, which refers to the process of decomposing plastics to produce fuel oil and fuel gas by heating or adding a certain catalyst at the same time. Plastic resource utilization method; this method can deal with waste plastics that are not easy to recycle, but most of the processes are mainly used to deal with the same kind or a single type of waste plastics. For the treatment of mixed waste plastics, there are currently sorting, feeding and slag discharge, Heat transfer and coking, catalyst regeneration and other technical problems, but also problems such as collection difficulties and the need to provide external heat sources lead to high investment and operation costs

[0008] Aiming at the low recovery rate of converter gas, low CO content in recovered gas and CO 2 , O 2 Due to the problems of high content and difficulty in recycling waste plastics, this invention proposes a new method of adding waste plastic particles to converters or electric furnaces as raw materials to prepare high-quality gas, and applies waste plastic powder pyrolysis and gasification technology to metallurgical high-temperature waste gas utilization , make full use of waste plastics as a resource, and open up a new technical approach for the utilization of metallurgical high-temperature waste gas