Construction method for large tuyere combined bricks in water-cooling plate structure blast furnace maintenance limited space

Abstract

The embodiment of the invention discloses a construction method of a large tuyere combined brick in a water-cooling plate structure blast furnace maintenance limited space. The construction method comprises the following steps: (1) removing the tuyere combined brick; (2) the tuyere combined bricks are transported into a furnace in advance; (3) building tuyere combined bricks; and (4) the gaps between the tuyere combined bricks and the retained refractory are filled with self-flowing castable, the hearth operation safety and the refractory masonry quality are guaranteed, and the construction period is greatly shortened.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnaces, and in particular to a construction method for large tuyere combined bricks in a restricted space for maintenance of a blast furnace with a water-cooled plate structure. Background Art

[0002] The furnace of a blast furnace with a water-cooled plate cooling system requires regular maintenance, such as refractory materials. After a period of use, large tuyere combination bricks need to be replaced. When replacing, the combination bricks need to be removed first and then repaired. At present, the tuyere combination bricks usually adopt the construction method of small bricks or integral casting. The construction period of small brick masonry is long, and the overall casting effect is inferior to that of refractory bricks. Summary of the invention

[0003] The purpose of the present invention is to solve the problems raised in the above-mentioned background technology. The present invention provides a method for constructing large tuyere combined bricks in a confined space of a blast furnace maintenance with a water-cooled plate structure, which ensures the safety of furnace operation and the quality of refractory masonry and greatly shortens the construction period.

[0004] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0005] The construction method of large tuyere combined bricks in a confined space for blast furnace maintenance with a water-cooled plate structure comprises the following steps:

[0006] (1) Removal of tuyere combination bricks;

[0007] (2) Transport the tuyere assembly bricks into the furnace in advance;

[0008] (3) Masonry of tuyere composite bricks;

[0009] (4) The gap between the tuyere composite bricks and the retained refractory material is filled with self-flowing castable material.

[0010] Furthermore, in step (1), before removing the tuyere assembly bricks, the water cooling plate in the tuyere assembly brick area is first removed; when the slag in the furnace is removed to 1m below the center line of the tuyere, the tuyere assembly bricks are removed. The specific removal process is as follows:

[0011] First remove the lower part and both sides of the tuyere hole, and then gradually remove the upper half circle of the tuyere; after removing each set of tuyere assembly bricks and a layer of refractory bricks under the upper water-cooling plate, use reinforcement tools to reinforce the upper refractory material until all tuyere assembly bricks are removed and reinforced.

[0012] Furthermore, in step (2), when the furnace carbon bricks are laid to the iron mouth, before the iron mouth composite bricks are laid, some of the tuyere composite bricks that cannot be transported from the reserved tuyere sleeve into the furnace are stored in advance in the furnace full-chamber scaffolding area, and the tuyere composite bricks are evenly distributed.

[0013] Furthermore, in step (3), after the furnace carbon bricks are laid, the furnace body protection shed is used to lift the tuyere assembly bricks and lay the lower semicircular tuyere assembly bricks.

[0014] Furthermore, in step (3), a forklift is placed on the external tuyere platform as a fixed point, and a sling is used to pass through the installation hole of the tuyere belt water cooling plate, and the upper semicircular tuyere combination bricks lifted to a certain height by the protective shed in the furnace are tied up, and the other end of the sling is connected to the forklift by a hand winch, and the upper semicircular tuyere combination bricks are slid sideways to the specified position through the cooperation of the hand winch and the lifting device of the protective shed, and finally a local adjustment is made, and the forklift is freely moved to change the construction angle until the construction is completed, the forklift stops providing a fixed point, and the reinforcement support is gradually removed before the upper semicircle is laid until all the masonry is completed.

[0015] Beneficial effects:

[0016] The present invention can provide a solution for the construction of large-block tuyere combined brick masonry in confined spaces, effectively ensuring the safety of furnace operations and the masonry quality of refractory materials, ensuring the construction quality while greatly shortening the construction period and reducing safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram after the construction of the combined brick of the present invention is completed. DETAILED DESCRIPTION

[0019] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0020] The present invention discloses a construction method of large tuyere combined bricks in a limited space for blast furnace maintenance with a water-cooled plate structure, comprising the following steps:

[0021] (1) Removal of tuyere combination bricks;

[0022] (2) Transport the tuyere assembly bricks into the furnace in advance;

[0023] (3) Masonry of tuyere composite bricks;

[0024] (4) The gap between the tuyere composite bricks and the retained refractory material is filled with self-flowing castable material.

[0025] In one embodiment of the present invention, before removing the tuyere assembly bricks, the water-cooling plate in the tuyere assembly brick area is first removed; when the slag in the furnace is removed to about 1m below the center line of the tuyere, the tuyere assembly bricks are removed. The specific removal process is as follows:

[0026] First remove the lower part and both sides of the tuyere hole, and then gradually remove the upper half circle of the tuyere; after removing each set of tuyere assembly bricks and a layer of refractory bricks under the upper water-cooling plate, use reinforcement tools to reinforce the upper refractory material until all tuyere assembly bricks are removed and reinforced.

[0027] In one embodiment of the present invention, in step (2), since the tuyere assembly bricks are composed of upper semicircular tuyere assembly bricks and lower semicircular tuyere assembly bricks, the size of a single brick is too large, therefore,

[0028] When the carbon bricks of the furnace are laid to the iron mouth, before the iron mouth composite bricks are laid, some of the tuyere composite bricks that cannot be transported from the reserved tuyere sleeve into the furnace will be stored in the furnace full-hall scaffolding area in advance, and the tuyere composite bricks are evenly distributed.

[0029] In step (3), after the furnace carbon bricks are laid, the furnace body protection shed is used to lift the tuyere assembly bricks and lay the lower semicircular tuyere assembly bricks 1. As for the upper semicircular tuyere assembly bricks, there is no lifting and laying space because the upper retained refractory bricks are well preserved under the protection of the water cooling plate and the gap between the top of the tuyere assembly bricks and the retained refractory bricks is about 90 mm.

[0030] In step (3), a forklift is placed on the external tuyere platform as a fixed point, and a sling is used to pass through the installation hole of the tuyere belt water cooling plate, and two bags of upper semicircular tuyere combination bricks lifted to a certain height by the protective shed in the furnace are tied up. The other end of the sling is connected to the forklift by a hand winch, and the upper semicircular tuyere combination bricks are slid sideways to the specified position through the cooperation of the hand winch and the lifting device of the protective shed. Finally, local adjustments are made, and the forklift is freely moved to change the construction angle until the construction is completed. The forklift stops providing a fixed point, and the reinforcement support is gradually removed before the upper semicircle is laid until all the masonry is completed.

[0031] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A construction method for large tuyere combined bricks in a confined space for blast furnace maintenance with a water-cooled plate structure, characterized in that: The following steps are involved: (1) Removal of tuyere combination bricks; (2) Transport the tuyere assembly bricks into the furnace in advance; (3) Masonry of tuyere composite bricks; (4) The gap between the tuyere composite bricks and the retained refractory material is filled with self-flowing castable material.

2. The method for constructing large tuyere combined bricks in a confined space for blast furnace maintenance with a water-cooled plate structure according to claim 1 is characterized in that: In step (1), before removing the tuyere assembly bricks, first remove the water cooling plate in the tuyere assembly brick area; when the slag in the furnace is removed to 1m below the center line of the tuyere, start removing the tuyere assembly bricks. The specific removal process is as follows: First remove the lower part and both sides of the tuyere hole, and then gradually remove the upper half circle of the tuyere; after removing each set of tuyere assembly bricks and a layer of refractory bricks under the upper water-cooling plate, use reinforcement tools to reinforce the upper refractory material until all tuyere assembly bricks are removed and reinforced.

3. The construction method of large tuyere combined bricks in a confined space for blast furnace maintenance with a water-cooled plate structure according to claim 1 is characterized in that: In step (2), when the furnace carbon bricks are laid to the iron mouth, before the iron mouth composite bricks are laid, some of the tuyere composite bricks that cannot be transported from the reserved tuyere sleeve into the furnace are stored in advance in the furnace full-chamber scaffolding area, and the tuyere composite bricks are evenly distributed.

4. The method for constructing large tuyere combined bricks in a confined space for blast furnace maintenance with a water-cooled plate structure according to claim 1 is characterized in that: In step (3), after the furnace carbon bricks are laid, the furnace body protection shed is used to lift the tuyere assembly bricks and lay the lower semicircular tuyere assembly bricks.

5. The construction method of large tuyere combined bricks in a confined space for blast furnace maintenance with a water-cooled plate structure according to claim 4 is characterized in that: In step (3), a forklift is placed on the external tuyere platform as a fixed point, and a sling is used to pass through the installation hole of the tuyere belt water cooling plate, and the upper semicircular tuyere combination bricks lifted to a certain height by the protective shed in the furnace are tied up. The other end of the sling is connected to the forklift by a hand winch, and the hand winch cooperates with the lifting device of the protective shed to slide the upper semicircular tuyere combination bricks laterally to the specified position, and finally a local adjustment is made. The forklift moves freely to change the construction angle until the construction is completed. The forklift stops providing a fixed point, and the reinforcement support is gradually removed before the upper semicircle is laid until all the masonry is completed.

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