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Bad Essen, Germany

Husken R.,Kuttner GmbH and Co. KG | Fechner R.,Kuttner LLC
Iron and Steel Technology | Year: 2011

Many steelmakers are faced with very high [%P] contents in the hot metal coming from blast furnaces. Combined blowing technology is based on top-blown oxygen and inert gas injection through the converter bottom using a jet-stream with supersonic velocity. This paper presents a summary of two decades' experience with combined blowing technology. Source


The blast furnace process is the most important process to produce crude iron. The necessary process energy is mainly covered by coke. A decisive measure in improving cost effectiveness by reducing the blast furnace coke rate was the injection of auxiliary fuels like pulverized coal, oil or natural gas into the raceway of the blast furnace. This paper will focus primarily on five important steps of continuous improvements in pulverized coal injection technology including the reduction of transport and injection gas to a minimum, the development ofPCI-plant design, the implementation of a fast and accurate injection rate control system, long-distance dense phase conveying and the Oxycoat technology. Finally future trends concerning pulverized coal injection into the blast furnace are discussed. Source


Schott R.,Kuttner GmbH and Co. KG
AISTech - Iron and Steel Technology Conference Proceedings | Year: 2012

Over the last decades, the blast furnace process has been the most important process for producing crude iron. A decisive measure in improving cost effectiveness by reducing the blast furnace coke rate was the injection of substitute fuels like pulverized coal, oil, or natural gas into the raceway of the blast furnace. After the second oil crisis during the early 1980s, the installation of pulverized coal injection plants became dominant. At that time, 28 years ago, the Küttner company started to build customized grinding and drying (GAD) and pulverized coal injection (PCI) plants. To meet market demands over a longer period it was crucial to develop and refine your own technologies continuously. In this respect, Küttner has developed and refined its own coal grinding and drying, and dense phase injection technology for blast furnaces. This paper will focus primarily on important steps of continuous improvements in pulverized coal injection technology. These steps include the reduction of transport and injection gas to a minimum, the implementation of a fast and accurate injection rate control system, and long distance dense phase conveying. Additionally, with the development of the Oxycoal+ and coal preheating technology, a further increase of the pulverized coal injection rate with simultaneous decrease of coke rate was achieved. By reference to industrial examples, customized GAD and PCI plants will be presented. Finally, economical aspects of using PCI with respect to other substitute fuels like natural gas will be discussed. Source


Schott R.,Kuttner GmbH and Co. KG
Stahl und Eisen | Year: 2016

A significant measure to improve cost effectiveness of the blast furnace process by reducing the coke rate was the injection of pulverized coal into the raceway of the blast furnace. For an optimal blast furnace operation using pulverized coal injection (PCI), it is necessary that the injected coal is gasified as fast and efficiently as possible within the tuyere and the raceway of the furnace. This paper focuses on some important steps of these PCI improvements accelerating PC gasification. Finally, the economic aspects of using PCI considering the presented optimization steps will be discussed. © Titel-/Coverphoto: SMS group. Source


Sener B.,Iskenderun Demir Ve Celik A.S. | Husken R.,Kuttner GmbH and Co. KG | Cappel J.,Cappel Stahl Consulting GmbH
Iron and Steel Technology | Year: 2013

Experts explain the control of hot metal sulfur coming in high levels from the blast furnace during steelmaking by the combined technology of hot metal and steel desulfurization. The benefit sharing between the BE and the BOF shops is recognized and the requirements of high-quality steel products on sulfur control are reviewed. Extensive examinations reveal that all steel types are on a different sulfur level and require special treatments according to their specifications. The total De-S required is split between the different product stages during liquid steel production. The main goal is to guarantee that the desulfurization reaction must be completely stopped after release of the liquid steel to the caster. Source

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