Theoretical Analyses on the High Pressure Operation and Oxygen Enriched Operation of Blast Furnace

Abstract

Synopsis:Mathematical models are proposed for analizing blast furnace preformance. High pressure operation and oxygen enriched operation are studied with the proposed models. The production rate and the fuel ratio predicted from the models agreed very well with the operation data. Also, possibility of predicting production limit is discussed.

Theoretical Estimations on the Longitudinal Distributions of Process Variables in Blast Furnace and on Its Productivity

“…Consequently,!, gives somew hat higher lon gitudinal distribution and./L sh ows somewhat lower on e. For th c fundamental equation s, Eqs. (21) and (29) have been taken into account for computing the lo ngitudinal distributions of!e and v. It has, however, been found that the addition of the two equations to th e fundamental equations has not exerted much influence on the productivity of the furnace . fractional reduction and fractional pre-redu ction of iron ore (-) fractional reduction of hematite (-) mass velocity of gas (kg/m 2 .…”

“…Th e models which belong to the third group were presented by K oump el ai.,6) the authors,7)-18) Lahiri et ai. , 19) Shimotsuma et ai., 20) Wakabayashi et al, 21) and Okabe et al 22) The model developed by Koump et al 6) consists 0 \ ' . six ordinary differential equations and the reaction rates of indirect redu ction of iron ore by CO and solution-loss reaction were taken into account, and the longitudinal distributions of temperatures of gas and solid particles, fractional reduction of iron ore and partial pressure of CO and CO 2 were illustrated in the zone b etween the top level and the melting one of burden bed.…”

“…Wakabayashi et al 21) d eveloped a mathematical model consisted of total balance and stepwise models, and analysed the operations of high top pressu re and of oxygen enrichment.…”

Recent Progress and Future Prospects in Blast Furnace Fuel Injection in Japan

“…This process was not widely adopted at that time for economi c r easo ns. Subsequently, in Nippon Koka n 's T surumi Works, replacem e nt ra tio in oil inje ction and utili za tion of CO a nd H 2 have bee n inves tiga ted at an increased oxygen enri chm en t ratio of 5 .7 % .23) The reports are now availab le a lso on the effect of oxygen enrichment on the furn ace co ndition in an experiment of oxygen-enriched blast at Sumi tomo M etal 's Wakayama Works,24) a nd on math em atical models and experimental res ults at Nagoya W orks by Wakabayas hi et a L. 25) Du e to the r ecent pri ce increase of coke, nique h as become economi cally acceptable. Report this tcch-A t Nip-pon Steel's Tobata,I°) this technique was applied [or la rge capac ity blast [urnaecs with an oil inj ection of abou t 100 kg/tHM, a nd the coke rate was redu ced to below 400 kg/t HM for th e first time .…”