Theoretical Study on an Oxygen Blast Furnace Using Mathematical Simulation Model.

Abstract

Theoretical study was made on the reasonable use of oxygen in the blast furnace to achieve both high productivity and low fuel rate with one dimensional blast furnace mathematical simulation model and following results were obtained. (1) There exist an optimum oxygen concentration and an optimumflame temperature and the increase of the oxygen concentration straightly results in the increases of fuel rate.(2)By the combined injection of pulverized coal with the increase of oxygen concentration to control the flame temperature at an optimumvalue of about 21 OO'C, both high productivity and low fuel rate can be achieved.KEYWORDS: blast furnace; oxygen; pulverized coal; mathematical model. 1. IntroductionThe blast furnace is a current leading ironmaking process with many features such as high productivity and high heat efficiency. However, high quality coke as well as high quality ore is necessary to achieve these features. As shown in Fig. 1 Effect ofthe ore injection on the blast furnace operation with oxygen enriched cold blast.operation were studied using the mathematical model. The fuel rate, the coke rate, the pulverized coal rate (Coal rate) andthe productivity of the blast furnace using oxygen enriched blast combined with the injection of pulverized coal were calculated as shown in Fig. 7

Perspective on Progressive Development of Oxygen Blast Furnace for Energy Saving

“…Koichi TAKAHASHI, 1) * Taihei NOUCHI, 1) Michitaka SATO 2) and Tatsuro ARIYAMA 3) 1) Steel Research Laboratory, JFE Steel Corporation, 1, Kokan-cho, Fukuyama, 721-8510 Japan.…”

“…furnaces are large blast furnaces with inner volumes exceeding 5 000 m 3 , and a blast furnace with an inner volume of 6 000 m 3 has been constructed in Korea. Historically, blast furnaces have been enlarged in the radial direction while keeping the height constant in order to avoid increased pressure drop.…”

“…Yamaoka studied the effectiveness of the oxygen blast furnace using a 1-dimensional numerical simulation and experiments with the experimental blast furnace. 3,4) Murai proposed an expanded concept of the oxygen blast furnace aiming at CO 2 mitigation. 5) In addition to the previous oxygen blast furnace, the application of waste plastics injection and top gas recycling were studied, and a numerical simulation confirmed that CO 2 emissions could be remarkably reduced compared with the conventional blast furnace.…”

“…The productivity of the oxygen blast furnace is almost double that of the conventional blast furnace because the limitations of the ore reduction rate and slag flooding are loosened. Ohno reported that the maximum productivity of 5.1 t/dm 3 was achieved in a campaign with the experimental blast furnace.…”

Unsteady Analyses of the Top Gas Recycling Oxygen Blast Furnace

“…Taking advantages of high productivity, high PCR (pulverized coal rate), low fuel rate, low CO 2 emission, etc., the TGR-OBF process is considered to be one of the promising ironmaking processes in future. [1][2][3][4][5][6][7][8][9][10] The exact process was presented by Wenzel in an American patent, 1) whereafter, fundamental studies such as static balance models and mathematical models were established by different researchers. [2][3][4][5][6][7][8][9][10] Meanwhile, industrial trails have been implemented in different countries to reduce carbon consumption and CO 2 emissions.…”