JPH079964U - Blast furnace tuyere with high temperature thermal shock resistance - Google Patents

Abstract

(57) [Summary] [Purpose] Protects against wear due to coke and hot metal in the furnace and melt damage due to hot metal dripping, and wear resistance, melt damage resistance, impact resistance, etc. are achieved, greatly improving tuyere life. Try. [Structure] Blast furnace tuyere with high temperature thermal shock resistance, characterized in that the tip and the outer circumference of the tuyere are covered with a heat and abrasion resistant cloth.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to tuyere of a blast furnace.

[0002]

[Prior art]

 The tuyere of a blast furnace is exposed to high temperature hot metal or slag, or is attacked by these hot metal or slag, and its life is extremely short due to severe wear and melting damage. In order to suppress this severe wear and melt loss and improve the life, do wear-resistant metals be embedded in the tip of the tuyere as in JP-A-49-122104 and JP-A-49-122105. As described in Japanese Utility Model Application Laid-Open No. 51-105317, a wear resistant metal is welded to the tip surface portion. Alternatively, it is proposed to cover the outer circumference of the tuyere with a refractory to improve the life of the tuyere, as disclosed in Japanese Utility Model Laid-Open No. 49-127404.

[0003]

[Problems to be solved by the present invention]

 However, these conventional tuyere have the following problems. First, wear resistant metal embedded in the tip of the tuyere and welded wear resistant metal can be expected to have a considerably long life, but wear resistant metal and the copper that constitutes the tuyere itself can be expected. Due to the large difference in thermal expansion, peeling occurs and the tuyere life cannot be improved to a satisfactory level. On the other hand, if the outer circumference of the tuyere is covered with a refractory, the refractory will be damaged due to the attack of the hot metal or slag, and the refractory covering effect cannot be maintained. The present invention solves these conventional drawbacks and provides a blast furnace tuyere excellent in abrasion resistance, melting resistance and impact resistance.

[0004]

[Means for Solving the Problems]

 The present invention is a blast furnace tuyere having high-temperature thermal shock resistance, characterized in that the tip and the outer circumference of the tip of the tuyere are covered with a heat-resistant and wear-resistant cloth.

[0005]

[Operation and Embodiment] An embodiment of the present invention will be described in detail with reference to the drawings. Figure 1 shows a cross-sectional view of a blast furnace tuyere with high-temperature thermal shock resistance. In the figure, reference numeral 1 is a blast furnace tuyere, and the blast furnace tuyere 1 covers a tip 2 and a tip outer circumference 3 with a heat- and wear-resistant cloth 4 (a canvas bag), and the tip outer circumference 3 is a base end of the canvas bag 4. To the tuyere 1 with tape 5. An impact cushioning material 6 is filled between the canvas bag 4 and the tip 2 of the tuyere 1, and a striped overlay 7 is provided on the outer periphery of the blast furnace tuyere 1.

The cloth 4 may be a canvas bag as long as it is excellent in abrasion resistance, melting resistance, impact resistance, etc., and is a ceramic cloth, asbestos cloth, etc., and the ceramics are preferably alumina, SiC, etc., As the tape 5, a ceramic tape is used. As the shock absorbing material 6 filled between the canvas bag 4 and the tip 2 of the tuyere 1, general sand, silica sand, ceramics powder, refractory powder or the like is used. The canvas bag 4 thus constructed is fixed to the tuyere by a canvas presser ring 8.

By installing the tuyere 1 of the blast furnace in the blast furnace, the slag is naturally deposited on the tape 5 and the ceramic cloth 4 at the base end. The accumulated slag 9 protects the blast furnace tuyere 1 from abrasion due to coke and hot metal in the furnace and melting damage due to dripping of hot metal. In addition, the shock-resistant cushioning effect against coke and hot metal attack is provided by the wear-resistant canvas bag 4 on the tip 2 and the tip outer periphery 3 of the tuyere 1 and the shock-absorbing material 6 filled between the tips 2 of the tuyere 1. In addition, the wear resistance and melt damage resistance of the cloth 4 and the tape 5 are more significantly exhibited.

In this way, by providing the cloth 4 and the tape 5 made of a canvas bag filled with the shock absorbing material 6 on the blast furnace tuyere 1, the phenomenon in the blast furnace is utilized to self-coat the slag and significantly increase the tuyere life. Can be improved.

[0009]

[Effect of device]

 By using the blast furnace tuyere of the present invention, it is protected from wear due to coke and hot metal in the furnace and melt damage due to dripping of hot metal, and wear resistance, melt damage resistance, impact resistance, etc. are achieved and the life of the tuyere is greatly increased. It has become possible to improve.

[Brief description of drawings]

FIG. 1 is a sectional view of a blast furnace tuyere with high temperature thermal shock resistance according to the present invention.

[Explanation of symbols]

 1 Blast furnace tuyere 2 Tuyere tip 3 Tip outer circumference 4 Cloth (sail bag) 5 Tape 6 Impact cushioning material 7 Striped build-up 8 Canvas holding ring 9 Deposited slag

Claims (1)

[Scope of utility model registration request] 1. A blast furnace tuyere having high-temperature thermal shock resistance, characterized in that the tip and the outer periphery of the tip of the tuyere are covered with a heat-resistant and abrasion-resistant cloth.