Blast furnace campaign extension by fundamental understanding of hearth processes

To prolong blast furnace campaign life, a great deal of research work has been carried out on the structure of stave cooler in the past decades, which, in turn, produced favorable results. However, due to the different thermal expanding property of the metal stave from that of the brick lining, the latter is subjected to crack, slide and damage. To solve the problem, a new stave cooler has been developed in this paper. Thus, a certain amount of anchors were welded on the traditional stave cooler, the unshaped gunning material can be fixed by anchors and the whole-lining be formed by gunning. The results of thermal simulating indicates: the bonding strength between the surface of stave cooler with anchors and the gunning lining is much higher than that between the surface of traditional stave cooler and the brick lining. Consequently, the service life of blast furnace will be extended. The optimizing design of the anchor was also described in the paper.

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The occurrence of iron-cordierite in blast-furnace linings

Mineralogical Magazine and Journal of the Mineralogical Society ◽

10.1180/minmag.1949.028.205.03 ◽

1949 ◽

Vol 28 (205) ◽

pp. 547-556 ◽

Cited By ~ 3

Author(s):

H. M. Richardson ◽

G. R. Rigby

Keyword(s):

Blast Furnace ◽

Vertical Direction ◽

Detailed Examination ◽

The Third ◽

Furnace Campaign

In an earlier paper the authors described the occurrence of artificial kalsilite in the hearth of no. 3 blast-furnace of the Kettering Iron Company. That paper contained a detailed description of the furnace campaign together with the peculiar conditions observed in the excavated hearth which was found to exhibit zoning in a vertical direction. The third zone containing kalsilitc was described in detail, but the only reference to the second zone stated that it was 2 inches deep (fig. 2, p. 77, this vol.) and consisted of a black glassy slag containing numerous crystals of cordierite (p. 78). The detailed examination of this zone now forms the basis of the present paper.

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True hearth lining wear as blast furnace campaign extension tool

Vestnik of Nosov Magnitogorsk State Technical University ◽

10.18503/1995-2732-2017-15-4-87-93 ◽

2017 ◽

Vol 15 (4) ◽

pp. 87-93

Author(s):

Jean-Philippe Houde ◽

◽

Rudolf Hebel ◽

André Cabral de Oliveira ◽

◽

...

Keyword(s):

Blast Furnace ◽

Furnace Campaign ◽

Hearth Lining

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Evaluation of Refractory Lining of the Blast Furnace Hearth and Bottom in Five Years of its Operation on the Basis of the Isotherms Shapes

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.212.179 ◽

2013 ◽

Vol 212 ◽

pp. 179-182

Author(s):

Grzegorz Kopeć ◽

Bolesław Machulec

Keyword(s):

Blast Furnace ◽

Refractory Lining ◽

Early Stage ◽

Measurement Data ◽

Furnace Operation ◽

Furnace Hearth ◽

Furnace Campaign ◽

Liquid Products ◽

One Year ◽

Partial Damage

Based on archival temperature measurement data regarding a blast furnace (capacity of 3200 m3) hearth and bottom refractory lining, empirical isotherms T = 300°C, for various periods of the first five years of the furnace campaign were determined. This resulted in an attempt to assess the hearth and bottom refractory lining in the third month and subsequently, in the next years of the blast furnace operation. The empirical isotherms, determined after the first three months, were compared to the isotherms determined using the method of mathematical modelling. These empirical isotherms were compared to each other, respectively in one-year intervals. The most distinctive changes of the hearth and bottom refractory lining were observed during the first three months of the furnace campaign. In the further period of five years, the changes were insignificant. During the early stage of furnace operation, observed deterioration of the refractory lining was associated with partial damage of the bottom ceramic layer and elephants foot-shaped defects of the refractory lining in the lower, thickened parts of the hearth walls. Early, elephants foot-shaped wear of the refractory lining is related to the mechanism of its wash-out by liquid products of the process during tapping, which results from certain maladjustment of the hearth and bottom inner geometry in modern furnaces to the hydrodynamic conditions of metal and slag flow.

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