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A medium-sized blast furnace shell replacement process

A blast furnace shell and furnace shell technology, which is applied to blast furnaces, blast furnace details, blast furnace parts and other directions, can solve problems such as complicated replacement procedures, and achieve the effects of shortening replacement construction period, less thermal deformation, and simplifying operation procedures

Active Publication Date: 2019-07-30
ANHUI MASTEEL ENG & TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem of complicated replacement procedures for medium-sized blast furnace shells at present, the present invention provides a medium-sized blast furnace shell replacement process

Method used

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  • A medium-sized blast furnace shell replacement process
  • A medium-sized blast furnace shell replacement process
  • A medium-sized blast furnace shell replacement process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Such as figure 1 As shown, the medium-sized blast furnace shell replacement process of the present embodiment comprises the following steps:

[0046] Step 1: Remove the old furnace shell and build an operating platform in the furnace;

[0047] Step 2: Make each belt furnace shell according to the drawings, weld the longitudinal seam of each belt furnace shell, make each belt furnace shell be cylindrical, and mark each belt furnace shell;

[0048] Step 3: Install the furnace shell of hearth part A, adopt the belt-by-belt installation method, that is, after each belt of furnace shell is hoisted, immediately weld the outer weld between the belt furnace shell and the installed furnace shell, and then Weld the inner weld seam between the belt furnace shell and the installed furnace shell, and then install the next belt furnace shell until the tuyere belt 1 is installed; step 4: install the furnace shell of the furnace body part B, Multi-belt installation welding is adopted...

Embodiment 2

[0057] Such as figure 2 As shown, the medium-sized blast furnace shell replacement process of this embodiment is similar to that of Embodiment 1, the difference is that, during welding, the groove of the annular seam between every two belt furnace shells is V-shaped on one side and one side (reserved 3mm gap), the opening faces the outside of the furnace body, and the angle of the groove is 40°-60° (in specific applications, the angle of the groove can be selected from 42°, 45°, 50°, 55°, 58° or 60°, etc. value).

[0058] In this embodiment, the unilateral V-shaped groove facing the outer side of the furnace body can obtain more effective weld thickness on the outer side of the furnace shell, which is beneficial to improve the connection strength of the annular seam. Moreover, the amount of weld seam cleaning required on the inner side of the ring seam of the furnace shell is also reduced, and the amount of welding required on the inner side of the ring seam is also less, an...

Embodiment 3

[0060] The medium-sized blast furnace shell replacement process of this embodiment is similar to that of Example 2, the difference is that, when welding the same circular seam between the furnace shells, 6 (or 4 and 8) welders are used simultaneously and symmetrically Welding, the welding direction of all welders should be consistent. When each welder welds the annular seam between the furnace shells, multi-layer and multi-pass welding is used, and the thickness of each layer of weld seam does not exceed 6mm (in specific applications, the thickness of the weld seam can be selected from 5.5mm, 5.0mm, 4.5mm . , 9.0mm, 8.5mm, 8.0mm, 7.5mm, 7.0mm, 6.5mm, 6.0mm, 5.5mm, 5.0mm and other values). The welding joints welded by adjacent welders are staggered, and the welding joints between the welds are evenly distributed. 6 welders back off welding in sections image 3 as shown,

[0061] In this embodiment, in order to reduce the thermal stress deformation of the furnace shell durin...

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Abstract

The invention discloses a medium-sized blast furnace furnace shell changing technology, belongs to the field of blast furnace changing technology, and aims to solve the problem of simplifying the changing processes of a medium-sized blast furnace furnace shell. The medium-sized blast furnace furnace shell changing technology comprises the following steps: at first, putting up a furnace-in operating platform; welding all bands of furnace shells into a cylindrical shape; then, adopting the band-by-band mounting and welding manner to mount and weld the furnace shells of the furnace hearth part; adopting multiple bands to mount and weld the furnace shells of the furnace body part; finally, manufacturing a furnace top band and a furnace bottom band into an integrity; and mounting the entire furnace top part on the furnace shell. During welding, a single-side V-shaped groove is formed in the circular seam of the furnace shell; a plurality of welders simultaneously and symmetrically carry outwelding; and multi-layer and multi-pass welding is adopted during welding to reduce the thermal deformation of the furnace shell. On the condition that the peripheral frame, the ascending pipe, the descending pipe and the platform of the blast furnace are not dismantled, the installation of the new furnace shell is finished, so that the medium-sized blast furnace furnace shell changing processesare greatly simplified, the changing time limit is shortened, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the field of blast furnace replacement technology, and in particular relates to a medium-sized blast furnace shell replacement technology. Background technique [0002] The role of the furnace shell is to fix the cooling equipment, ensure the firmness of the blast furnace masonry, seal the furnace body, and some also need to bear the load of the furnace top. In addition to bearing huge gravity, the furnace shell also bears thermal stress and internal gas pressure, and sometimes it has to resist sudden impacts such as material collapse, material sitting, and even possible gas explosions, so the shell must have sufficient strength. After the blast furnace has been used for a period of time, the furnace shell will be deformed and affect production. Therefore, production must be stopped for major and medium repairs to restore the blast furnace to normal working conditions. [0003] At present, when the medium-sized blast furnace s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B7/00
CPCC21B7/00
Inventor 张烨刘军
Owner ANHUI MASTEEL ENG & TECH GRP
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