Anti-cracking water-cooled furnace door

Abstract

The utility model discloses a kind of anti-cracking water-cooled furnace door, it is related to ferroalloy processing technical field. Including water-cooled wall, water-cooled wall side is provided with refractory layer, first baffle is fixed around water-cooled wall, second baffle is fixed around refractory layer. When anti-cracking water-cooled furnace door operates, the refractory material four around baffle of fire face is heated and burns or deformed, since with water-cooled wall part is welded using segment welding, when thermal deformation stress extends, it will not extend to the part of water-cooled wall baffle, solve the problem that the baffle around water-cooled wall in situ is caused by pulling crack and leads to water leakage.

Description

Technical Field

[0001] This utility model relates to the field of water-cooled furnace door technology, and in particular to a crack-resistant water-cooled furnace door. Background Technology

[0002] Water-cooled furnace doors are an indispensable component of semi-enclosed submerged arc furnace equipment. During the operation of the submerged arc furnace, the refractory layer and the water-cooled wall are usually designed with an integrated baffle to form an edge restraint structure. This structure disperses the stress concentration caused by thermal expansion and contraction of the furnace door under high-temperature conditions, and at the same time prevents the high-temperature airflow inside the furnace from directly scouring the connection between the refractory layer and the water-cooled wall, reducing local overheating caused by heat transfer through edge gaps. However, under the influence of high-temperature flue gas, some of the baffles around the refractory layer will be burned, deformed, and cracked due to high-temperature baking. The longitudinal cracks in the baffles around the refractory material gradually spread to the water-cooled wall baffles, often causing the water-cooled wall baffles to crack and resulting in water leakage, which seriously affects the safe and stable operation of the submerged arc furnace. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a crack-resistant water-cooled furnace door to solve the water leakage problem caused by the extension of tensile cracks in the refractory material baffles to the water-cooled wall baffles due to heat.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A crack-resistant water-cooled furnace door includes a water-cooled wall 2, a refractory layer 1 on one side of the water-cooled wall 2, a first baffle 3 fixed around the water-cooled wall 2, and a second baffle 4 fixed around the refractory layer 1.

[0006] As a further improvement of this utility model, a weld with a length of 50mm-100mm is provided between the water-cooled wall 2 and the first baffle 3 at 100mm intervals; a weld with a length of 50mm-100mm is provided between the refractory layer 1 and the second baffle 4 at 100mm intervals.

[0007] As a further improvement of this utility model, both the first baffle 3 and the second baffle 4 are made of high-temperature resistant and high-strength Q235 steel.

[0008] Compared with the prior art, the beneficial effects of this utility model are:

[0009] By installing a refractory layer on one side of the water-cooled wall, the refractory layer blocks the direct impact of high temperatures inside the furnace on the water-cooled wall, reducing thermal stress caused by drastic temperature changes. Simultaneously, a first baffle and a second baffle are fixed around the water-cooled wall and the refractory layer, forming a double edge constraint structure. This disperses stress concentration at the furnace door edge, preventing cracking due to thermal expansion and contraction, extending the furnace door's service life, and ensuring its sealing performance and structural stability under high-temperature conditions. Furthermore, the water-cooled wall and the first baffle, as well as the refractory layer and the second baffle, are welded in segments with 50mm-100mm welds every 100mm. Compared to continuous full welding, this effectively reduces the accumulation of welding stress. The segmented welds also provide some expansion space, accommodating differences in thermal expansion between components at high temperatures and preventing cracking at the weld or base material due to excessive rigidity. The shorter weld length also reduces welding deformation, ensuring precise fit between the baffle, the water-cooled wall, and the refractory layer, further enhancing the structure's crack resistance.

[0010] The first and second baffles are made of high-temperature resistant and high-strength Q235 steel. Q235 steel can maintain high mechanical strength in high-temperature environments, which can stably restrain the edge deformation of the water-cooled wall and refractory layer, making the baffles less prone to deformation or breakage under long-term high-temperature conditions, and ensuring the crack resistance of the overall structure of the furnace door. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0012] In the diagram: 1. Refractory layer; 2. Water-cooled wall; 3. First baffle; 4. Second baffle. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0014] A crack-resistant water-cooled furnace door includes a water-cooled wall 2. A refractory layer 1 is provided on one side of the water-cooled wall 2. The refractory layer 1 can block the high temperature inside the furnace from directly acting on the water-cooled wall 2, reducing the thermal stress caused by drastic temperature changes in the water-cooled wall 2. A first baffle 3 is fixed around the water-cooled wall 2, and a second baffle 4 is fixed around the refractory layer 1. The edge restraint structure of the first baffle 3 and the second baffle 4 can disperse the stress concentration at the edge of the furnace door, prevent the overall structure from cracking due to thermal expansion and contraction, extend the service life of the furnace door, and ensure the sealing performance and structural stability of the furnace door under high temperature conditions.

[0015] A weld with a length of 50mm-100mm is provided every 100mm between the water-cooled wall 2 and the first baffle 3; a weld with a length of 50mm-100mm is provided every 100mm between the refractory layer 1 and the second baffle 4. This segmented welding method can reduce the accumulation of welding stress compared with continuous full welding, and it reserves a small expansion space to adapt to the thermal expansion difference of each component at high temperature, avoiding cracking at the weld or base material due to excessive rigid constraints. At the same time, the shorter weld length can reduce welding deformation, ensure the fitting accuracy of the baffle with the water-cooled wall and the refractory layer, and further enhance the crack resistance of the structure.

[0016] The refractory layer 1 is a mixture of high-alumina aggregate and aluminic acid. The high-alumina aggregate has excellent high-temperature resistance and wear resistance. The addition of aluminic acid can improve the bonding strength and thermal shock resistance of the material to a certain extent, making the refractory layer 1 less prone to cracking and peeling when repeatedly subjected to high-temperature impacts in the furnace. Combined with the cooling effect of the water-cooled wall 2, it can effectively block heat transfer, reduce the overall temperature fluctuation of the furnace door, and suppress the risk of cracking from the material level.

[0017] Both the first baffle 3 and the second baffle 4 are made of high-temperature resistant and high-strength Q235 steel. The thickness of the first baffle 3 and the second baffle 4 is set to 14mm. Q235 steel can still maintain high mechanical strength in high-temperature environments. The 14mm thickness ensures that the baffle has sufficient rigidity and can stably restrain the edge deformation of the water-cooled wall 2 and the refractory layer 1, thus avoiding the restraint failure caused by the baffle softening at high temperatures.

[0018] During operation: When the furnace temperature rises, the high-alumina aggregate and aluminic acid mixture used in refractory layer 1 effectively blocks heat transfer inward, reducing the heating amplitude of water-cooled wall 2. Simultaneously, water-cooled wall 2 continuously cools through internal water circulation, forming a temperature gradient with refractory layer 1, avoiding the risk of cracking caused by drastic temperature differences in a single structure. The first baffle 3 and second baffle 4 around water-cooled wall 2 and refractory layer 1 undergo slight thermal expansion with the main structure at high temperatures. The segmented welds, spaced 50mm-100mm apart, provide a buffer for this expansion. Compared to continuous full welding, this design avoids stress concentration at the weld due to rigid constraints, thus preventing weld cracking or base material cracking. The first baffle 3 and second baffle 4, made of high-temperature resistant, high-strength Q235 steel with a thickness of 14mm, maintain sufficient rigidity at high temperatures, stably constraining the edges of water-cooled wall 2 and refractory layer 1, preventing overall structural loosening or cracking caused by edge deformation.

[0019] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A crack-resistant water-cooled furnace door, characterized in that: It includes a water-cooled wall (2), a fire-resistant layer (1) is provided on one side of the water-cooled wall (2), a first baffle (3) is fixed around the water-cooled wall (2), and a second baffle (4) is fixed around the fire-resistant layer (1).

2. The anti-crack water-cooled furnace door according to claim 1, characterized in that: A weld with a length of 50mm-100mm is provided between the water-cooled wall (2) and the first baffle (3) at 100mm intervals; a weld with a length of 50mm-100mm is provided between the refractory layer (1) and the second baffle (4) at 100mm intervals.

3. The anti-crack water-cooled furnace door according to claim 2, characterized in that, The first baffle (3) and the second baffle (4) are both made of Q235 steel.

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