Title

HOT TRANSPORT OF “DRI” TO ELECTRIC ARC FURNACE (E.A.F.)

HOT TRANSPORT OF “DRI” TO ELECTRIC ARC FURNACE (E.A.F.)

Authorship

Capriotti, Luis Omar

Capriotti, Luis Omar

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DOI

10.5151/2594-357X-22400

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Abstract

The sponge Iron Transport (hot DRI) at high temperatures (700ºC) and reducing or inert atmospheres is a difficult task because the pipe is subject to thermal stresses, corrosion attacks, erosive wear and abrasive wear. The main requirement is to preserve transport metal content, maintaining temperature and particle size of the DRI. To Transport hot DRI to the Steel Making (EAF), the best alternatives are two: i) Metallic Conveyors (used by Midrex), an alternative way of transporting hot DRI is by using Metallic Conveyors which required complicated moving parts, and intensive maintenance, complicated Inertization due to the long distance and open spaces, If inert gas which contains CO2 is used, CO generation will occur which will lead to safety hazard, dust collection to prevent hot DRI dust from flying aroung and transfer points and rigid configuration; and ii) significant loss of heat in the hot DRI, when the fluid involved in the operation is a gas (nitrogen), the granular solid fluidization of grain size as the pellets, follow a mechanism of Lift that indicate relationships between the pressure gradient and velocity. The gaseous fluid bubbles rise and break through the layer on the upper surface of it, splashing up a few solid particles. As the gas flow velocity increases, the bubbling action becomes more and more violent, with projection of particles to a considerable distance above the bed, it takes them to fall back to it, and continue with the remaining particles to achieve a gaseous in diluted fluid movement. Based in the concept of pneumatic of bulk materials, it has the following main features characteristics of gas-solid fluidized system, design criteria pneumatic transport, pneumatic transport system components, design data and conclusions.

The sponge Iron Transport (hot DRI) at high temperatures (700ºC) and reducing or inert atmospheres is a difficult task because the pipe is subject to thermal stresses, corrosion attacks, erosive wear and abrasive wear. The main requirement is to preserve transport metal content, maintaining temperature and particle size of the DRI. To Transport hot DRI to the Steel Making (EAF), the best alternatives are two: i) Metallic Conveyors (used by Midrex), an alternative way of transporting hot DRI is by using Metallic Conveyors which required complicated moving parts, and intensive maintenance, complicated Inertization due to the long distance and open spaces, If inert gas which contains CO2 is used, CO generation will occur which will lead to safety hazard, dust collection to prevent hot DRI dust from flying aroung and transfer points and rigid configuration; and ii) significant loss of heat in the hot DRI, when the fluid involved in the operation is a gas (nitrogen), the granular solid fluidization of grain size as the pellets, follow a mechanism of Lift that indicate relationships between the pressure gradient and velocity. The gaseous fluid bubbles rise and break through the layer on the upper surface of it, splashing up a few solid particles. As the gas flow velocity increases, the bubbling action becomes more and more violent, with projection of particles to a considerable distance above the bed, it takes them to fall back to it, and continue with the remaining particles to achieve a gaseous in diluted fluid movement. Based in the concept of pneumatic of bulk materials, it has the following main features characteristics of gas-solid fluidized system, design criteria pneumatic transport, pneumatic transport system components, design data and conclusions.

Keywords

Pneumatic transport; Hot DRI.

Pneumatic transport; Hot DRI.