Large-span structure brick for hydrogen-based shaft furnace

Abstract

The utility model belongs to the technical field of hydrogen metallurgical industry, and provides a large-span structure brick for a hydrogen-based shaft furnace. The large-span structure brick is arranged above two rows of supporting vertical bricks. The large-span structure brick comprises a left side brick, a middle brick and a right side brick; steps are arranged on the inner sides of the left side brick and the right side brick, and grooves are formed in the outer sides of the left side brick and the right side brick; the step on the left brick is matched with the step on the right brick to form a concave space; the middle brick is of an inverted-T-shaped structure matched with the U-shaped space. The left side brick, the middle brick and the right side brick are matched to form a structure which is integrally in a vertical wide wedge shape and of which the lower part forms an arch bridge shape; and the grooves on the left side brick and the grooves on the right side brick are respectively buckled with the two rows of supporting vertical bricks. The forming process difficulty of a single brick is effectively reduced, the structural strength and the density uniformity are improved, the risk of local damage and collapse caused by thermal stress concentration is effectively avoided, the reliability is effectively improved, and the requirement for the overall service life of the hydrogen-based shaft furnace is met.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydrogen metallurgy industry, and particularly relates to a large-span structural brick for a hydrogen-based shaft furnace. Background Technique

[0002] The hydrogen-based shaft furnace uses hydrogen-rich or pure hydrogen as the reducing gas to directly reduce iron, and is the core equipment for innovating and developing low-carbon metallurgy technology; the carbon emission intensity of directly reducing iron by using all-green hydrogen production is about 78% lower than that of conventional blast furnace ironmaking, and it can achieve a reduction of 1.24 tons of carbon dioxide per ton of iron; the injection chamber of high-temperature and high-pressure hydrogen is the core structural part of the hydrogen-based shaft furnace, and this part is composed of large-span structural bricks supported by vertical bricks on both sides. This large-span structural brick needs to have sufficient strength, wear resistance and good thermal shock resistance to realize the stable support of the upper refractory materials and resist the thermal shock brought by high-temperature and high-pressure hydrogen flow.

[0003] In large hydrogen-based shaft furnaces, the length of the above-mentioned large-span structural brick is close to 1 meter, and the overall structure is generally adopted at present. Due to the restriction of the refractory forming process, it is very difficult to ensure the uniform distribution of the structural strength and density of the brick, resulting in the risk of local damage and collapse caused by thermal stress concentration during service, seriously threatening the overall service life of the shaft furnace. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a large-span structural brick for a hydrogen-based shaft furnace, which can effectively improve the strength and density uniformity of a single brick, avoid thermal stress concentration during service, effectively reduce the risk of local damage and collapse, and ensure the overall service life of the shaft furnace.

[0005] The utility model adopts the following technical solutions to achieve the above purpose:

[0006] A large-span structural brick for a hydrogen-based shaft furnace is arranged above two rows of supporting vertical bricks; the large-span structural brick has a left brick, a middle brick and a right brick; both the inner sides of the left brick and the right brick have steps, and both the outer sides of the left brick and the right brick have grooves; the steps on the left brick and the steps on the right brick cooperate to form a concave-shaped space; the middle brick is a convex-shaped structure that matches the concave-shaped space; the left brick, the middle brick and the right brick cooperate to form an overall vertical-width wedge shape, and the lower part forms an arch-shaped structure; the grooves on the left brick and the grooves on the right brick are respectively buckled with the two rows of supporting vertical bricks.

[0007] Each row of supporting vertical bricks is a plurality of bricks arranged up and down.

[0008] A large-span structural brick for a hydrogen-based shaft furnace proposed by the present utility model adopts the above technical solution to effectively improve the strength and density uniformity of a single brick, and at the same time forms a stable support in cooperation with an arch structure, effectively avoiding the risk of local damage and collapse caused by thermal stress concentration during service, effectively improving the reliability and meeting the overall service life requirements of the hydrogen-based shaft furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a schematic diagram of the large-span structural brick for a hydrogen-based shaft furnace of the present utility model;

[0010] Figure 2 is a front view schematic diagram of the large-span structural brick for a hydrogen-based shaft furnace of the present utility model;

[0011] Figure 3 is a top view schematic diagram of the large-span structural brick for a hydrogen-based shaft furnace of the present utility model.

[0012] In the figure: 1, left brick; 2, middle brick; 3, right brick; 4, supporting vertical brick. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0013] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but it shall not be construed as a limitation to the present utility model.

[0014] As Figure 1 shown, a large-span structural brick for a hydrogen-based shaft furnace, the large-span structural brick is composed of three parts: a left brick 1, a middle brick 2, and a right brick 3. The inner sides of the left brick 1 and the right brick 3 both have stepped structures, which cooperate to form a concave-shaped space; the middle brick 2 has a convex-shaped structure and can be installed in the concave-shaped space formed by the cooperation of the left brick 1 and the right brick 3; the outer sides of the left brick 1 and the right brick 3 both have stepped structures and can cooperate with the supporting vertical brick 4 to form a support.

[0015] The single weight of the left brick 1, the middle brick 2, and the right brick 3 is controlled within 50 kg, and they are installed as a whole through the cooperation of fire clay. Generally, the process seam of the fire clay is controlled within 1 - 3 mm. The overall cooperation span can meet the span requirement of more than 1 m. The whole is in a vertically wide wedge shape, and the lower part forms an arch-shaped structure.

[0016] When the present utility model is used, it can greatly reduce the volume and weight of a single brick, effectively reduce the forming process difficulty, improve the strength and density uniformity of the structural brick, and at the same time, the formed arch structure can effectively avoid the risk of local damage and collapse caused by thermal stress concentration under the condition of forming a stable support structure, effectively improving the reliability and meeting the overall service life requirements of the hydrogen-based shaft furnace.

Claims

1. A large-span structural brick for a hydrogen-based vertical furnace, characterized in that: The large-span structural bricks are arranged above two columns of supporting bricks; the large-span structural bricks include left-side bricks, middle bricks and right-side bricks; the inner sides of the left-side bricks and the right-side bricks are provided with steps, and the outer sides of the left-side bricks and the right-side bricks are provided with grooves; the steps on the left-side bricks and the steps on the right-side bricks cooperate to form a concave-shaped space; the middle brick is a convex-shaped structure that cooperates with the concave-shaped space; the left-side bricks, the middle bricks and the right-side bricks cooperate to form an overall vertically wide wedge-shaped structure, and the lower part forms an arch-shaped structure; the grooves on the left-side bricks and the grooves on the right-side bricks are respectively buckled with the two columns of supporting bricks.

2. The large-span structural brick for a hydrogen-based vertical furnace according to claim 1, characterized in that: Each column of supporting bricks is arranged in a plurality of vertical arrangements.

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