Blast furnace bottom carbon brick maintenance supporting device and maintenance method

Abstract

The invention discloses a blast furnace bottom carbon brick maintenance supporting device and a maintenance method. The blast furnace bottom carbon brick maintenance supporting device comprises a steel wire rope, a supporting plate, a wedge-shaped bolt and a tightener, one side of the supporting plate is fixedly connected with one end of the steel wire rope, two parallel wedge-shaped bolts are arranged on the side, away from the steel wire rope, of the supporting plate, and a tightener is arranged on the steel wire rope. According to the invention, under the condition that the uneroded brick lining at the upper part of the hearth is not replaced, eroded carbon bricks at the lower part of the hearth can be completely replaced, and partial seriously eroded places can be locally replaced.

Description

Technical Field

[0001] The invention relates to the technical field of refractory repair of an iron-making blast furnace, and in particular to a blast furnace bottom carbon brick maintenance support device and a maintenance method. Background Art

[0002] The structure of the blast furnace used for ironmaking can be divided into the furnace bottom, hearth, belly, waist, furnace body, throat, etc. from bottom to top. Different parts require different refractory materials according to different working conditions. A layer of 345-1150 mm thick refractory bricks is built inside the blast furnace shell to reduce the heat dissipation of the furnace shell. The damage mechanism of the brick lining of each part of the blast furnace is different. In order to prevent the local brick lining from being damaged first and shortening the life of the blast furnace, different refractory brick linings must be selected according to factors such as damage mechanism, cooling intensity and blast furnace operation. In the past, high-grade and ultra-high-grade high-alumina bricks were traditionally used for the hearth and furnace bottom. These bricks were gradually melted and damaged. Due to shrinkage and poor brickwork quality, they often caused major burn-through accidents in the past. At present, carbon refractory materials, namely carbon bricks, are mostly used for the hearth and furnace bottom, which basically solves the problem of hearth burn-through.

[0003] At present, the main masonry types of furnace hearths are: all carbon bricks; carbon bricks on the circumference and lower part of the furnace hearth, and carbon composite bricks or high-alumina bricks on the upper part. The latter is also called a comprehensive furnace bottom. The disadvantage of carbon bricks is that they are easily corroded by air, carbon dioxide, water vapor and alkali metals. The furnace hearth, especially the elephant foot area below the iron mouth, is particularly susceptible to damage due to long-term molten iron circulation erosion, wear, thermal stress, chemical erosion, etc., while the carbon bricks on the side wall above the iron mouth are largely well preserved. If the current technology wants to repair the carbon bricks in the elephant horn area below the side wall by masonry, it is necessary to first remove all the carbon rings in the furnace, and build the carbon bricks on the surface of the furnace bottom layer by layer from bottom to top to the marked position. Although this construction method replaces the corroded carbon bricks at the bottom, it also wastes the good bricks on the upper part, causing the cost of the maintenance project to increase significantly. Therefore, it is necessary to propose a maintenance support device and maintenance method for carbon bricks at the bottom of a blast furnace to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a maintenance support device and maintenance method for blast furnace bottom carbon bricks, so as to replace the damaged carbon bricks at the bottom without damaging the upper carbon bricks, thereby reducing the construction cost of furnace hearth masonry repair.

[0005] In the first aspect, the present invention provides a blast furnace bottom carbon brick maintenance support device, comprising: a steel wire rope, a support plate, a wedge-shaped pin and a tensioner; one side of the support plate is fixedly connected to one end of the steel wire rope, and two parallel wedge-shaped pins are arranged on the side of the support plate away from the steel wire rope, and a tensioner is arranged on the steel wire rope.

[0006] Furthermore, a limiting partition is provided in the middle of the upper surface of the support plate, and the limiting partition is arranged parallel to the wedge-shaped latch.

[0007] Furthermore, the cable tensioner is a manual cable tensioner or a hydraulic cable tensioner.

[0008] In a second aspect, the present invention provides a method for maintaining carbon bricks at the bottom of a blast furnace, the method using the above-mentioned carbon brick maintenance support device at the bottom of a blast furnace, the method comprising the following steps: Step 1, determine the refractory bricks that need to be replaced, and determine the top refractory brick layer to be replaced; Step 2: insert the support plate under the upper layer of refractory bricks to be replaced. One support plate holds up two adjacent upper layer refractory bricks. Insert the wedge-shaped pin of the support plate into the gap between the cooling walls. Fix the upper end of the wire rope to the top of the blast furnace. In this way, insert the support plate under a circle of upper layer refractory bricks in turn. Step 3: Start the tensioner on the wire rope, tighten each wire rope, and lift the upper refractory brick above the refractory brick to be replaced; Step 4: remove and replace the refractory bricks under the support plate until all are replaced; Step 5. After the lower bricks are replaced, loosen the tensioner on the wire rope, loosen each wire rope, lower the upper refractory bricks, and complete the replacement.

[0009] The present invention has the following beneficial effects: a blast furnace bottom carbon brick maintenance support device and maintenance method of the present invention has a simple structure and is easy to operate. The corroded carbon bricks in the lower part of the furnace can be completely replaced without replacing the uncorroded brick lining in the upper part of the furnace, and partial replacement can also be performed on some severely corroded areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0011] Figure 1 This is a schematic diagram of the structure when replacing the bottom refractory bricks; Figure 2 It is a structural schematic diagram of the pallet; Figure 3 It is a schematic diagram of the tensioner structure; Figure 4 This is a partial schematic diagram of replacing the bottom carbon bricks. DETAILED DESCRIPTION

[0012] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those generally understood by those of ordinary skill in the art to which the present application belongs.

[0013] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0014] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for clarity, the thickness of the layers and regions is enlarged, and the same reference numerals are used to represent the same devices, so their description will be omitted.

[0015] See also Figures 1 to 4 An embodiment of the present invention provides a blast furnace bottom carbon brick maintenance support device, comprising: a steel wire rope 1, a support plate 2, a wedge-shaped pin 3 and a tensioner 5; one side of the support plate 2 is fixedly connected to one end of the steel wire rope 1, and two parallel wedge-shaped pins 3 are arranged on the side of the support plate 2 away from the steel wire rope 1, and a tensioner 5 is arranged on the steel wire rope 1.

[0016] Specifically, in order to make the support plate more stable, a limit partition plate 4 is provided in the middle of the upper surface of the support plate 2, and the limit partition plate 4 is provided in parallel with the wedge-shaped latch 3. The tensioner 5 can be a manual tensioner or a hydraulic tensioner.

[0017] The embodiment of the present invention provides a method for maintaining carbon bricks at the bottom of a blast furnace, using the above-mentioned carbon brick maintenance support device at the bottom of a blast furnace, and the method comprises the following steps: Step 1: Determine the refractory bricks that need to be replaced and determine the top refractory brick layer to be replaced.

[0018] Step 2: insert the support plate 2 under the upper layer of refractory bricks 10 to be replaced. One support plate 2 holds up two adjacent upper layer refractory bricks 10. Insert the wedge-shaped pin 3 of the support plate 2 into the gap between the cooling walls. Fix the upper end of the wire rope 1 on the top of the blast furnace. Using this method, insert a circle of upper layer refractory bricks 10 under the support plate 2 in turn.

[0019] Specifically, multiple sets of supporting devices may be used to prevent the support plates 2 from falling out after the wedge-shaped pins 3 of multiple support plates 2 are inserted into the gaps between the cooling walls.

[0020] Step three, start the tensioner 5 on the steel wire rope 1, tighten each steel wire rope 1, and lift the upper refractory brick 10 above the refractory brick to be replaced.

[0021] Step 4: dismantle and replace the refractory bricks under the support plate 2 until all are replaced.

[0022] Step 5: After the lower bricks are replaced, loosen the tensioner on the wire rope 1, loosen each wire rope, put down the upper refractory bricks 10, and complete the replacement.

[0023] In summary, based on the purpose of reducing construction costs, the present invention uses a supporting device to achieve replacement of damaged lower carbon bricks without damaging the upper carbon bricks, thereby significantly reducing maintenance costs for steel companies.

[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A blast furnace bottom carbon brick maintenance support device, characterized in that: include: A steel wire rope (1), a support plate (2), a wedge-shaped pin (3) and a tensioner (5); one side of the support plate (2) is fixedly connected to one end of the steel wire rope (1), two parallel wedge-shaped pins (3) are arranged on the side of the support plate (2) away from the steel wire rope (1), and the steel wire rope (1) is provided with a tensioner (5).

2. A blast furnace bottom carbon brick maintenance and support device as claimed in claim 1, characterized in that: A limiting partition plate (4) is arranged in the middle of the upper surface of the support plate (2), and the limiting partition plate (4) is arranged parallel to the wedge-shaped latch pin (3).

3. A blast furnace bottom carbon brick maintenance support device as claimed in claim 1, characterized in that: The tensioner (5) is a manual tensioner or a hydraulic tensioner.

4. A method for maintaining blast furnace bottom carbon bricks, characterized in that: The method adopts the blast furnace bottom carbon brick maintenance support device according to claim 1, and the method comprises the following steps: Step 1, determine the refractory bricks that need to be replaced, and determine the top refractory brick layer to be replaced; Step 2: insert the support plate (2) under the upper layer of refractory bricks (10) of the refractory bricks to be replaced, one support plate (2) holds up two adjacent upper layer of refractory bricks (10), insert the wedge-shaped pin (3) of the support plate (2) into the gap between the cooling walls, fix the upper end of the steel wire rope (1) to the top of the blast furnace, and use this method to insert a circle of upper layer of refractory bricks (10) under the support plate (2) in turn; Step 3, start the tensioner (5) on the steel wire rope (1), tighten each steel wire rope (1), and lift the upper refractory brick (10) above the refractory brick to be replaced; Step 4, dismantling and replacing the refractory bricks under the support plate (2) until all the bricks are replaced; Step 5: After the lower bricks are replaced, loosen the tensioner on the wire rope (1), loosen each wire rope, and lower the upper refractory bricks (10) to complete the replacement.

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