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A mud-stripping method for quick recovery of mud bag falling off at the front end of iron mouth

A fast recovery and taphole technology, applied in the direction of furnace, furnace type, blast furnace parts, etc., to achieve the effect of cleaning slag and iron, ensuring stable and straight line, and restoring the depth of taphole

Active Publication Date: 2022-02-18
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of the above documents involved the depth of the iron hole, the size of the mud bag at the front end of the iron hole, and the calculation method of the mud volume

Method used

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  • A mud-stripping method for quick recovery of mud bag falling off at the front end of iron mouth
  • A mud-stripping method for quick recovery of mud bag falling off at the front end of iron mouth
  • A mud-stripping method for quick recovery of mud bag falling off at the front end of iron mouth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] See figure 1 , the diameter of a blast furnace hearth is 11.5m, the diameter of the tapping drill pipe is d=0.050m, and the angle of the taphole is α=10°. The selection of the dredging amount of the blast furnace is realized by the following steps:

[0044] 1. According to the diameter of blast furnace hearth (D h ,m) Select the tap hole depth (L t ,m), substituting into formula (1) to get:

[0045] L t =45%×D h / 2=2.6m

[0046] 2. Calculate the amount of mud pumping in the iron mouth channel

[0047] Iron mouth channel volume (V 1 ,m 3 ), substituting into formula (2) to get:

[0048] V 1 =1 / 4×3.14×d 2 × L t =0.005m 3

[0049] Clay bulk density 1.7t / m 3 , then the amount of mud dredging in the iron mouth channel (Q 1 ,kg), substituting into formula (3) to get:

[0050] Q 1 =1.7×V 1 ×1000=9kg

[0051] 3. The amount of mud pumped by the mud bag at the front end of the iron hole:

[0052] The mud bag at the front end of the tap hole is required to form...

Embodiment 2

[0068] See figure 1 , the diameter of a blast furnace hearth is 11.5m, the diameter of the tapping drill pipe is d=0.055m, and the angle of the taphole is α=10°. The blast furnace can choose the amount of iron and mud for each time through the following steps:

[0069] 1. According to the diameter of blast furnace hearth (D h ,m) Select the tap hole depth (L t ,m), substituting into formula (1) to get:

[0070] L t =50%×D h / 2=2.9m

[0071] 2. Calculate the amount of mud pumping in the iron mouth channel

[0072] Iron mouth channel volume (V 1 ,m 3 ), substituting into formula (2) to get:

[0073] V 1 =1 / 4×3.14×d 2 × L t =0.007m 3

[0074] Clay bulk density 1.7t / m 3 , then the amount of mud dredging in the iron mouth channel (Q 1 ,kg), substituting into formula (3) to get:

[0075] Q 1 =1.7×V 1 ×1000=12kg

[0076] 3. The amount of mud pumped by the mud bag at the front end of the iron hole:

[0077] The mud bag at the front end of the tap hole is required t...

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Abstract

The invention relates to a dredging method for rapid recovery of the mud bag falling off at the front end of the iron hole. When the mud bag at the front end of the iron hole falls off, the appropriate depth of the iron hole and the size of the mud bag at the front end of the iron hole are quickly restored, comprising the following steps: 1) determining the appropriate size of the mud bag at the front end of the iron hole Depth of the iron hole; 2) Calculation of the amount of mud knocked out of the iron hole channel Q 1 =1.7×V 1 ×1000; 3) Amount of mud bagging at the front end of the iron hole: a spherical crown-shaped mud bag is formed at the front end of the iron hole, and the spherical surface covers more than 2m below the center line of the iron hole. Lining in the 2m area to prevent the erosion of slag and iron on the lining; Q 2 =1.7×V 2 ×1000; 4) The total amount of sludge required Q=Q 1 +Q 2 ; 5) The total dredging amount is divided into 3 times; the advantages are: the best selection of dredging amount and timing to quickly restore the appropriate tap hole depth and the size of the mud bag at the front end of the tap hole.

Description

technical field [0001] The invention belongs to the field of operation in front of a blast furnace, and in particular relates to a dredging method for quickly recovering from the shedding of mud bags at the front end of a tap hole. Background technique [0002] Slag tapping and iron tapping are the basic operations of blast furnaces, and the taphole is the weakest part of the hearth structure of the blast furnace. Since the hearth lining near the taphole area is subjected to repeated erosion and erosion of molten slag and iron during the tapping process, it becomes a long-lived part of the hearth. weak link. At present, the hearth erosion mainly occurs in the taphole area and within 1-2m below the taphole. Therefore, the taphole maintenance plays an important role in the high efficiency and long life of the blast furnace. After the large-scale blast furnace, because there is no slag hole, it is necessary to strengthen the maintenance of the iron hole under the high smelting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B7/12
CPCC21B7/125
Inventor 车玉满郭天永孙鹏姜喆姚硕费静
Owner ANGANG STEEL CO LTD
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