Thermodynamic Modelling of the Injection of Waste Products into a Blast Furnace

Abstract

The purpose of this paper is to investigate the possibility to use blast furnaces for recycling of household and industrial wastes. In this respect, recycling conditions and requirements to utilize waste products are considered. The structure of waste products allowable for recycling in the blast furnace has been studied. Their behaviour is simulated at higher temperatures both in the presence (gasification, combustion) and in the absence (pyrolysis) of reactive gases. The possibility of formation of different components and their maximal concentrations, including dioxins and furans, are predicted. The results obtained prove not only the possibility, but highly recommend to use blast furnaces for the recycling of waste products, particularly plastics and other materials with high contents of carbon and hydrogen. This method guarantees not only the destruction but also the maximal effective use of the above‐mentioned chemical components leading to the formation of ecologically safe products. One of the main problems in the recycling of waste products by thermal decomposition is the formation of dioxins and furans. However, the investigations conducted show that concentrations of dioxins and furans in the blast‐furnace gas do not exceed the allowed concentration limits.

Multi‐Objective Genetic Algorithms and Genetic Programming Models for Minimizing Input Carbon Rates in a Blast Furnace Compared with a Conventional Analytic Approach

“…The Blast furnace process is highly complex and non‐linear in nature. In the past, analytical models based on theoretical knowledge of chemical reactions, thermodynamics, and transport phenomena were developed, but these had limited success . This is mainly due to the fact that these models depend on many parameters, which are impossible to know accurately, and furthermore, the complex interaction between these parameters is often not easy to resolve.…”

Combustion of waste oils simulating their injection in blast furnace tuyeres

“…In more recent research [10] a thermodynamic study has been made of a) pyrolysis, b) combustion, and c) formation and behaviour of dioxins for the materials carbofer, shredder light fraction, and a group of six plastic materials of different types, in order to analyse the possibility of injecting these materials into the tuyeres of the blast furnace without the formation of ecotoxicants.…”

Kinetic Analysis of the Pyrolysis of Hydrochar Derived from PVC and Its Thermochemical Behaviors in a Blast Furnace

“…Heavy metal pollution mainly comes from the iron ore in the BF, and the impact of heavy metal pollution in the injected waste plastic is reduced. 10 Moreover, Korobov et al 11 proved that the injection of waste plastic would not cause the formation of dioxins through thermodynamic calculations of the chemical reactions (decomposition, combustion, and gasification) of waste plastic in the raceway.…”