高炉内条件におけるコークス灰分中SiO2の転化反応
1987 年 73 巻 6 号 p. 637-644
詳細
1987 年 73 巻 6 号 p. 637-644
In order to clarify the mechanism of the transformation reaction of SiO2 in coke ash under operating conditions in blast furnace, fundamental experiments were performed with single coke particle as sample under gas flowing condition by the use of a pressurized high frequency furnace.Based on the experimental results, an unsteady state mathematical simulation model with consideration of the radial distribution was developed and applied to the quantitative evaluation of the transformation reaction of SiO2 in coke ash.
The following knowledge was obtained.
1) Reaction rate constants for both SiO gas generation reaction (k1) and SiC formation reaction (k2) were obtained in the temperature range of 1350-1650°C.
2) The influences of total pressure, CO gas partial pressure and coke size on the transformation reaction can be quantitatively evaluated by the use of the simulation model.
3) In the actual operation, both the decrease of coke temperature, in other words, flame temperature, and the increase of coke size in the lower part of blast furnace are effective for the restraint of SiO gas generation reaction.
4) The behavior of SiO2 in coke ash in the lower part of blast furnace was estimated.
