Investigations on the Phenomena in the Blast Furnace with Heavy Oil Injection

Abstract

Synopsis:In order to study the phenomenological changes in the blast furnace accompanied with the injection of heavy oil at the tuyere, the reaction gas at the tip of the tuyere was sampled by, the use of the horizontal probe and analysed. In the case of no oil injection, CO2 content increased with decreasing oxygen content in the inward direction gradually, and after reaching the maximum point of CO2 content, CO and H2 content increased. When the injection rate of heavy oil increased, these phenomena tended to proceed rapidly and to be accomplished in shorter range. When the nozzle head of the oil burner was pulled backward in the blow pipe, the decrease of oxygen occurred even in the blow pipe. The decrease of the space of the raceway accompanied with the increase of oil rate was found also by the bar-test. The gas distribution at the top of the shaft was measured by the horizontally inserted probe installed at the stockline level and the gas efficiency was calculated.

Numerical Analysis of Raceway Formation in Isothermal and Non-reactive Packed Bed

“…Under the moving bed condition, the packing structure is equalized even the initial packing structure is different, and the final status of the raceway becomes identical. Thus, these results theoretically ensure the empirical findings on the raceway formation, 19) and are suggestive to the cold model experiments on raceway behavior.…”

“…In the previous raceway studies, the size of the raceway was discussed. The raceway size in these studies is defined by the packing structure (variation of thrust force of inserted rod), [19][20][21] the voidage (transmit-tance of incident light), 17) the particle motion, 1,[8][9][10][11][12][13][14]16,18,30,44) and so on. In this study, the raceway size is defined by the particle motion.…”

“…The size measurements in the actual furnaces and the experimental furnaces has been carried out. [19][20][21][22][23][24][25][26][27][28][29] In these experiments, the raceway size was first measured by inserting rod or probe [19][20][21][22] or injecting spherical filling 23,24) into the raceway. Although these methods can measure the shape of the raceway, the flow inside the raceway is disturbed.…”

Analyses on Blast Furnace Raceway Formation by Micro Wave Reflection Gunned through Tuyere

“…With respect to the measurement of raceway depth in actual furnaces, measurement by Shimizu et al 7) by inserting a 19-mm-f-diameter metal rod or measurement by Tamura et al 4) by the use of a raceway depth indicator equipped with a loadcell are reported, but there is a problem of measurement accuracy under the disturbance by contraction of cross sectional area of wind and PC injection. In addition, Hatano et al 8) collected coke in front of tuyere, applied a relational expression of raceway factor and penetration factor at an experimental furnace, and estimated the raceway depth, but this is not suited for tracing the dynamic behavior of raceway.…”