Transport von DRI (Direct Reduced Iron)

Research output: ThesisMaster's Thesis

Abstract

Direct reduced iron (DRI), also known as sponge iron, is produced by the direct reduction of iron ore (in the form of pellets, briquettes, lumps or fines) by a reducing gas. The reducing gas is a mixture of hydrogen (H2) and carbon monoxide (CO). Sponge iron has an iron content comparable to pig iron. Steelmaking with DRI generates significantly less CO2 and is therefore an environmentally friendly iron carrier. DRI or in briquette form HBI (Hot Briquetted Iron) replaces sinter in the blast furnace route or scrap in the electric furnace route. DRI is mainly produced in countries with large natural gas deposits such as India, Russia, North Africa or the USA. In order to supply the European steel industry with this raw material, it has to be transported over long distances. However, this transport is associated with certain challenges and is currently or not established. The high surface area/volume ratio makes DRI very reactive, increasing its vulnerability to reoxidation and giving it its pyrophoric nature. Transport of DRI by sea is already taking place but is limited to steel mills located close to shore or with access to inland ports. In order to supply the steelworks in Central Europe, the goods should be transported cheaply and in large quantities. Rail is the most suitable means of transport for this. However, this industry does not currently offer a solution for the transport of sponge iron. This thesis is intended to provide an overview of the various handling options for DRI, show which problems can occur during transport and possible solutions. Countries with a high production share of DRI are primarily located on other continents. For this reason, when developing the transport concept, the focus was on a simple handling between ship and rail. Standardized container dimensions provide a good basis for this, since container transport is already established in both transport sectors, beside this opens up a new type of transport for the steel industry apart from the conventional bulk transport. In the transport concept, DRI containers of different sizes were fitted into container steel frames. The wear of these containers during loading and unloading was then examined and validated in a Discrete Element Method (DEM) simulation. Finally, the various concepts were evaluated regarding the handling before and after rail transport, also considering a wide range of parameters such as loading volume, total weight, ease of handling, etc. In this way a concept that most likely requires further investigation could be determined.

Details

Translated title of the contributionTransport of DRI (Direct Reduced Iron)
Original languageGerman
QualificationDipl.-Ing.
Awarding Institution
Supervisors/Advisors
Award date16 Dec 2022
DOIs
Publication statusPublished - 2022