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Blast furnace air supply belly pipe avoiding small sleeve abrasion and machining assembling method of blast furnace air supply belly pipe

An assembly method and a technology of direct blowing pipes, which are applied in the direction of the tuyere, can solve the problems of easy wear and tear, and achieve the effects of extending the period of scheduled maintenance, reducing the consumption of spare parts, and reducing the frequency of maintenance

Inactive Publication Date: 2017-03-15
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the small sleeve of the blast furnace tuyere in the prior art is washed by coal powder and is easy to wear and tear, the present invention provides a blast furnace air supply direct blowing pipe and its processing and assembly method that avoids the wear of the small sleeve

Method used

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  • Blast furnace air supply belly pipe avoiding small sleeve abrasion and machining assembling method of blast furnace air supply belly pipe
  • Blast furnace air supply belly pipe avoiding small sleeve abrasion and machining assembling method of blast furnace air supply belly pipe
  • Blast furnace air supply belly pipe avoiding small sleeve abrasion and machining assembling method of blast furnace air supply belly pipe

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] combine Figure 1-6 , a blast furnace air supply straight blowpipe for avoiding wear and tear of the small sleeve, comprising a straight blowpipe 1, a gun holster 12 and a small sleeve 6, and also includes a flange 7 and a gun holster protective sleeve 121, wherein one end of the straight blowpipe 1 is connected to an elbow, Straight blowpipe 1 other end is connected with small cover 6, and straight blowpipe 1 is provided with gun holster 12, and gun holster 12 is inserted in the straight blowpipe 1, and the extension line of gun holster 12 intersects with the center line of small sleeve entrance.

[0043] The outside of the holster 12 is provided with a holster protective cover 121 , and the holster protective cover 121 plays the role of fixing and protecting the holster 12 .

[0044] In view of the technological standard requirements of the blast furnace itself, the coal injection gun is inserted into the holster 12, the coal injection gun is inserted into the small s...

Embodiment 2

[0050] A blast furnace air supply direct blowpipe avoiding small sleeve wear in this embodiment is the same as embodiment 1, a processing and assembling method for blast furnace air supply direct blowpipe avoiding small sleeve wear, including the following steps:

[0051] A, according to a kind of blast furnace air-supply blowpipe that avoids wear and tear of small cover described above, carry out rolling pipe and make straight blowpipe 1, form the shape of bell mouth;

[0052] B, cut off a position to form the gun holster 12 on the straight blow pipe 1, fix two ribs into the gun holster 12, and weld it on the straight blow pipe 1;

[0053] C, weld the holster protective cover 121 on the straight blowpipe 1, and form a side cavity between the holster 12 and the holster protective cover 121;

[0054] The centerline of the holster 12 of the coal injection gun is in the horizontal plane, and the angle between the centerline of the holster 12 of the coal injection gun and the cent...

Embodiment 3

[0060] A kind of blast furnace air supply direct blowpipe and its processing and assembling method of avoiding small sleeve wear of this embodiment are the same as embodiment 1, and the main technical scheme of this embodiment is: change the angle of the lance path of straight blowpipe 1 spray gun (for coal powder injection) , when coal powder is sprayed into the blast furnace through the spray gun and passes through the small tuyere cover (i.e. the small cover 6), avoid coal dust from washing the small tuyere cover, so as to achieve the purpose of prolonging the service life of the small tuyere cover. It mainly includes the following technical points: reduce the angle between the center line of the coal injection lance and the center line of the straight blowing pipe from the original 11 degrees to 8 degrees; reduce the angle between the center line of the coal injection lance and the horizontal plane from the original The 25 degrees of the coal injection gun are reduced to 0 ...

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Abstract

The invention discloses a blast furnace air supply belly pipe avoiding small sleeve abrasion and a machining assembling method of the blast furnace air supply belly pipe, and belongs to the field of iron making equipment. The blast furnace air supply belly pipe comprises a belly pipe body, a gun sleeve and a small sleeve and further comprises a flange and a gun sleeve protection sleeve. One end of the belly pipe body is connected with a bend. The end of the belly pipe body is connected with the small sleeve. The belly pipe body is provided with the gun sleeve. The gun sleeve is inserted in the belly pipe body. The outer portion of the gun sleeve is provided with the gun sleeve protection sleeve. A coal spraying gun is inserted in the gun sleeve and inserted in the small sleeve, and the distance between the end of the coal spraying gun and the end of the small sleeve in the length direction is larger than or equal to 180 mm. The end of the belly pipe body is a water cooling end, and sealing is guaranteed in the manner that the water cooling end and the small sleeve are in close contact together. The other end of the belly pipe body is connected with the bend through the flange. The flange is provided with a flange groove matched with the gun sleeve in outer diameter. The gun sleeve center line of the coal spraying gun is located in the horizontal plane. According to the blast furnace air supply belly pipe avoiding small sleeve abrasion and the machining assembling method of the blast furnace air supply belly pipe, the service life of the air opening small sleeve can be prolonged, meanwhile, the periodical repairing period of a blast furnace is prolonged, and the overhauling frequency is reduced.

Description

technical field [0001] The invention relates to the field of ironmaking equipment, in particular to a blast furnace air supply direct blowing pipe and a processing and assembling method thereof which avoid wear of a small sleeve. Background technique [0002] Blast furnace direct blowing pipe is the key equipment for blast furnace ironmaking and smelting. Its function is to deliver hot air stably and evenly to the blast furnace. At the same time, through the direct blowing pipe, coal powder can be injected into the furnace to reduce coke ratio and smelting cost. Due to the erosion of pulverized coal injection, frequent wear and leakage of the tuyere small sleeve (the life of the small sleeve is about 2 months), seriously restricting the normal production of the blast furnace. In the prior art, the wear resistance of the small tuyere cover itself is mostly improved by changing the material of the small tuyere cover itself, and the small cover needs to be remade, and the cost ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B7/16
CPCC21B7/16C21B7/163
Inventor 李海宾吴宏亮凌明生高鹏纪全胡万杰
Owner MAANSHAN IRON & STEEL CO LTD
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