Coal Slurry Injection into Blast Furnace
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概要
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One of the methods for reducing blast furnace iron-making cost is to inject auxiliary fuels throngh the tuyeres.<BR>As for the fuel used, heavy oil is commonly used with one exception or two.<BR>In using heavy oil as auxiliary fuel, however, there arises the problem of an increase in sulfur content in the pig iron, and of heat compensation to increase the fuel used.<BR>These problems can be solved by using coal produced in Hokkaida, where the Muroran Works of Fuji Iron and Steel Co., Ltd. is located.<BR>On the other hand, however, since coal price fluctuation in Japan is wide, it would be far more advantageous, in reducing cost, to set up a technique for injecting a slurry-form fuel, a mixture of coal and heavy oil.<BR>In the summer of 1961, research on studying the selection of coals, viscosity of slurry and critical velocity in piping was launched to ascertain the properties of slurry.<BR>On the basis of the knowledge gained, slurry equipment was provided for the No.1 blast furnace at the Muroran Works, with an inner volume of 1, 042m<SUP>3</SUP>, (afterwards relined to 1, 126m<SUP>3</SUP>) and actual slurry injection test was carried on, and now slurry of 50wt% coal concentration is being injected quite satisfactory into blast furnace through 16 tuyeres.<BR>By means of slurry injection, the sulphur content of pig iron thus produced has been reduced. The effect of using slurry on the out-put of pig iron and other blast furnace performance is about the same as in the case of using heavy oil alone. But, since slurry is cheaper than heavy oil, the use of slurry has cut down the cost of pig iron production.
- 一般社団法人 日本エネルギー学会の論文
一般社団法人 日本エネルギー学会 | 論文
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