高炉レースウェイ周辺部の圧力,温度および炭材粉率におよぼす微粉炭吹込みの影響

抄録

Pulverized Coal Injection (PCI) tests were carried out by using a coke-filled test furnace to clear the combustion behaviour of Pulverized Coal (PC) in a blast furnace and its effects on the furnace phenomena.
Effects of Pulverized Coal Injection Rate (PCR) and charged sinter on pressure drop, temperature and fine particle fraction distribution in the test furnace were studied. On the basis of these experimental results, carbon solution loss reaction rates of unburnt PC and fine coke was measured with "in-situ" analysis of high temperature gas. The results obtained are as follows.
(1) Increase in blast pressure with PCI is much dependent on the increase in blast velocity by PC combustion in the blow pipe.
(2) As unburnt PC accumulated in the furnace is gasified with CO₂ much faster than fine coke, it has no harmful influence on the pressure drop in the furnace.
(3)As descending velocity of solid at the peripheral part in blast furnace bosh decreases with increase in PCR, furnace heat loss increases.