PDF | Using blended learning method, Blast Furnace subject was analysed inside the DidaTec Project. The analysed factors were the quality of. Keywords: Blast furnace, Titanium carbide, Titanium nitride, Phase composition, Microstructure, Life follows out that the blast furnace will for certain remain for. The Principle of Blast Furnace Operational Technology and. Centralized Gas Flow by Center Coke Charging. Dr. Yoshiyuki MATSUI, Research & Development .
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Iron Ore Processing for the Blast Furnace. (Courtesy of the National Steel Pellet Company). The following describes operations at the National Steel Pellet. Powdered coal is injected into the blast furnace to ensure an even, high temperature is maintained in the blast furnaces. The molten iron is drained continuously. The purpose of a blast furnace is to chemically reduce and physically convert iron oxides into liquid iron called. "hot metal". The blast furnace is a huge, steel.
Yoshio Okuno Takanobu Inada Masakata Shimizu Kanji Takeda Yoshiaki Kashiwaya Yoshimasa Kajiwara Kazuyoshi Yamaguchi In , PC1 operation is under being coaducted at all of 30 blast furnaces in Japan. The average injection rate in was The purpose of high rate PC1 is to reduce the pig iron cost through the utilization of non-coking coal and to extend the available coke oven life. Figure shows the age distribution of coke oven in Japan. Figure shows the relationship between coke supply and coke demand in Japan based on the assumption that a coke oven can last 35 years on an average.
Since the average age of coke oven in Japan is currently about 25 years as shown in Fig. Otherwise, as shown in Fig.
From this reason, high rate PC1 can be considered to be an attractive technology in ironmaking process, and the development of high rate PC1 is now being actively pursued in Japan. Actually, the injection rate is increasing year by year, and as described above, high rate PC1 operation over 2OOkglthm was carried out at some blast furnaces.
However, there are still some problems to be solved in high rate PCI. For example, the relationship between fuel rate and productivity is shown in Fig.
The increase in fuel rate would bring about a decrease in productivity. The increase in fuel rate could reduce the benefit acquired from the high rate PCI.
It is necessary to lower the coke rate without raising the fuel rate sharply, aiming at increasing PCR. The system will not be in equilibrium if the gas composition corresponds to a point off the curve.
Such a system will attempt to reach equilibrium. For example, if the gas composition corresponds to a point above the curve, the reaction will proceed in the forward direction.
It will continue until all FeO is consumed or until the gas composition drops to the curve. The equilibrium curves have been combined with melting point data to create Figure 6.
This predominance diagram identifies the most stable form of iron existing in an atmosphere of mixed CO and CO2. Temperature and the composition of the gas phase are varied. If the ratio is low, the atmosphere acts as an oxidizing agent and one or another of the iron oxides is most stable.
The rise in the curve means that the blast furnace atmosphere becomes a stronger reducing agent with temperature. The predominance diagram explains how the blast furnace accomplishes its purpose of converting iron ore into iron. Above K, the gas mixture has sufficient reducing ability to completely convert the particle into Fe.
The CO2 CO curve of Figure 6 reveals the fate of the furnace gases during their rapid ascent through the furnace. As the temperature decreases, the equilibrium shifts in the backward direction. The result is the conversion of carbon monoxide into soot and carbon dioxide.
For general information about merchant pig iron, please visit the pig iron page.
The process is continuous with raw materials being regularly charged to the top of the furnace and molten iron and slag being tapped from the bottom of the furnace at regular intervals. Molten iron and slag collect in the furnace hearth. Being less dense, the slag floats on top of the iron.
Slag and iron are tapped at regular intervals through separate tap holes. For merchant pig iron production, the iron is cast into ingots; in integrated steel mills, the molten iron or hot metal is transferred in torpedo ladle cars to the steel converters. Slag is transferred to slag pits for further processing into usable materials, for example raw material for cement production, road construction, etc.
When charging the blast furnace, burden materials are added in layers.