高炉喷吹废塑料的先进技术

废塑料循环利用技术对于全球环境保护和社会发展都是一个非常重要的课题。JFE制钢公司为了将废塑料作为高炉的还原剂，通过热模燃烧实验；研究了废塑料的燃烧气化率。经过研究，为了改善粗粒废塑料的燃烧性，开发了同时喷吹煤粉或／和天然气的技术，为了提高废塑料的燃烧和气化率及炉内透气性，JFE开发出将废塑料与碳酸钙（CaC03）复合造粒技术。另外，JFE还研究了废塑料精细粉碎技术。此技术已经应用在实际生产中。

Establishment of Advanced Recycling Technology for Waste Plastics in Blast Furnace

The establishment of technology for recycling waste plastics is a highly important issue for global environmental conservation and the society. JFE Steel has pursued the effective use of waste plastics as a reducing agent for injection into blast furnaces, and conducted hot model experiments to study the combustion and gasification behaviour of waste plastics. On the basis of this basic investigation, advanced technologies that can further improve the combustion and gasification efficiency of waste plastics even with low strength has been developed; i.e. in order to improve combustibility of fine waste plastics, technology for simultaneous injection of such plastics with pulverized coal and/or natural gas has been developed. For improved the strength of plastics, technology for combined agglomeration of waste plastics with CaC03 has been developed. In addition, technology for fine crushing of waste plastics has been studied on the basis of new ideas, and this technology has been applied in actual plant operation. These technologies have been successfully applied in actual blast furnaces, contributing to lowering the reducing agent rate.