Regenerative furnace burner brick mold with plastic variable angle

Abstract

The utility model relates to a rolling mill furnace maintenance technical field especially relates to a kind of plasticity variable-angle regenerative furnace burner brick mould, including inner form plate, outer form plate, bolt pull rod and spout prefabricated pipe, inner form plate and outer form plate are perpendicular to box bottom plate, inner form plate is set in burner position inner side, and inner form plate is same with burner cross section size;Outer form plate is set in burner position outer side, and outer form plate height is 1 / 5~1 / 4 of burner height;The lower portion of the inner form plate and the outer form plate is provided with a plurality of corresponding fixing holes, a bolt pull rod is arranged in the fixing hole to connect the inner form plate and the outer form plate, a plurality of spout prefabricated pipes are arranged on the inner form plate, and the spout prefabricated pipes are directed to the outer form plate at different angles;Plastic refractory material is arranged between the inner form plate and the outer form plate.The utility model has the beneficial effects that: shorten the construction period of regenerative burner brick repair, reduce the repair cost of heating furnace, and achieve the purpose of prolonging the service life of regenerative heating furnace.

Description

Technical Field

[0001] This utility model relates to the field of steel rolling furnace maintenance technology, and in particular to a regenerative furnace burner brick mold with plastic variable angle. Background Technology

[0002] The steel industry is an important raw material industry, and heating furnaces are one of the main energy-consuming equipment in steel rolling mills, accounting for 60%-70% of the process energy consumption. The energy consumption level directly affects the production cost of steel rolling. Steel companies are making great efforts to rely on technological innovation to promote the high-efficiency, low-cost and green transformation of heating furnaces.

[0003] Burner bricks are a crucial component of regenerative furnaces, and their structure directly affects fuel combustion and furnace lifespan. In regenerative furnace combustion, the primary function of burner bricks is to organize the flame. To ensure safe combustion, regenerative combustion technology commonly employs external mixing combustion. This means that air or gas is heated within its respective regenerative burner and then injected into the furnace chamber at a specific angle and speed through nozzles on the burner bricks, achieving mixed combustion of air and gas.

[0004] In regenerative combustion, the air or gas used for combustion, as well as the high-temperature flue gas, all pass through the regenerative burner. The burner bricks are subjected to frequent forward and reverse scouring by the high-temperature airflow. After a period of use, internal deformation, breakage, and even falling out of the regenerative chamber may occur in the burner bricks, altering the gas injection speed and angle, ultimately affecting the performance of the regenerative furnace. In production practice, the lifespan of the burner bricks is far shorter than that of the furnace walls. The regenerative burner bricks and their nozzles are the weakest points in the regenerative furnace, significantly impacting its performance. Damage to the regenerative burner bricks leads to reduced combustion efficiency, poor combustion effect, and increased energy consumption, necessitating frequent preparation and replacement of the regenerative burner bricks.

[0005] The existing replacement method mainly involves the installation of prefabricated components, which leads to the following problems:

[0006] 1. Regenerative burners are large in size, and during installation, construction workers not only experience high labor intensity but also face significant safety hazards.

[0007] 2. Due to the deformation of the furnace wall, the installation dimensions of each burner brick are different. When replacing them, there are no burner bricks of different sizes available. If existing prefabricated burner bricks are used, the furnace wall or burner bricks need to be removed, which will prolong the maintenance cycle and increase the maintenance cost of the regenerative furnace.

[0008] 3. Precast burner bricks need to take into account the installation dimensions, which may result in large gaps between the bricks and the wall after installation, poor precision, and easy problems later.

[0009] To date, the problem of damage to burner bricks in regenerative furnaces has not been effectively resolved, directly affecting the efficiency of regenerative furnaces and becoming a major challenge in their maintenance, which urgently needs to be addressed. Utility Model Content

[0010] To overcome the shortcomings of existing technologies, this utility model provides a regenerative furnace burner brick mold with plasticity and variable angle. This mold is installed at the burner position of the regenerative furnace, with layers of plastic refractory material laid inside. The bricks are then laid online on the furnace body, replacing the previous prefabricated burner bricks. The new burner bricks are plastic and allow for flexible adjustment of the burner brick nozzle angle, enabling seamless integration between the newly laid burner bricks and the old furnace wall. This shortens the construction period for repairing regenerative burner bricks, reduces furnace maintenance costs, and extends the service life of the regenerative furnace. Simultaneously, it reduces spare parts procurement costs, improves the operability and safety of construction personnel, and prevents accidents.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] A mold for burner bricks in a regenerative furnace with malleable variable angles includes an inner template, an outer template, bolts and tie rods, and precast nozzle pipes. The inner and outer templates are perpendicular to the bottom plate of the furnace housing. The inner template is located inside the burner position and has the same cross-sectional dimensions as the burner. The outer template is located outside the burner position and its height is 1 / 5 to 1 / 4 of the burner height. Multiple corresponding fixing holes are provided at the bottom of the inner and outer templates. Bolts and tie rods are installed in the fixing holes to connect the inner and outer templates. The bolts and tie rods adjust the distance between the inner and outer templates to determine the thickness of the burner bricks. Multiple precast nozzle pipes are installed on the inner template, pointing towards the outer template at different angles. Layers of malleable refractory material are laid between the inner and outer templates in a staggered manner.

[0013] Furthermore, the nozzle size, shape, and nozzle angle α of the pre-fabricated nozzle tube are adjusted according to the heat distribution and flame rigidity of the regenerative heating furnace.

[0014] Furthermore, the distance between the inner template and the outer edge of the furnace inner wall is 50mm to 500mm, and the gap between the inner template and the sides of the burner in the box body is ≤3mm.

[0015] Furthermore, the gap between the outer template and the two sides of the box body is ≤1mm.

[0016] Furthermore, the number of pre-fabricated nozzle tubes is 1 to 25; the diameter of the pre-fabricated nozzle tubes is 5 mm to 89 mm; and the setting angle α of the pre-fabricated nozzle tubes is 0 to 45°.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1) The burner brick mold enables online burning of burner bricks. The new burner bricks are plastic and the angle of the burner brick nozzle can be flexibly adjusted, which can make the newly built burner bricks fit seamlessly with the old furnace wall, shorten the construction period for repairing regenerative burner bricks, reduce the maintenance cost of the heating furnace, and achieve the goal of extending the service life of the regenerative heating furnace.

[0019] 2) The burner brick mold has a simple structure, which reduces the cost of spare parts procurement, improves the operability and safety of bricklayers, and avoids accidents. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the burner mold structure of this utility model.

[0021] In the diagram: 1. Inner template; 2. Outer template; 3. Fixing hole; 4. Bolt tie rod; 5. Precast nozzle pipe; 6. Plastic refractory material; 7. Base plate; 8. Box body; 9. Outer edge of furnace inner wall. Detailed Implementation

[0022] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0023] like Figure 1 As shown, the process for preparing burner bricks using a mold with plastic variable angle for regenerative furnace burners includes the following: an inner mold 1 and an outer mold 2 are set at the burner position and connected by bolts and tie rods 4. The distance between the inner mold 1 and the outer mold 2 is the thickness of the burner brick. A pre-formed nozzle pipe 5 is set on the inner mold 1, facing the direction of the outer mold 2. The nozzle size, shape, and angle of the pre-formed nozzle pipe 5 are determined according to the heat distribution and flame rigidity of the regenerative furnace. Plastic refractory material 6 is laid between the inner mold 1 and the outer mold 2. The plastic refractory material 6 is cut into blanks by a tool. The blanks should be laid in a staggered and close manner, layer by layer. During the laying process, it is tamped with a tamping hammer. After the surface is tamped, the joints of the blanks should be tamped to ensure there are no gaps. Then, the entire area is tamped three times with a pneumatic hammer or a hand hammer to make the material dense. When tamping, pay attention to the edges and do not tamp down the original refractory material. Then tamp the entire repair surface into a smooth plane.

[0024] like Figure 1As shown, a regenerative furnace burner brick mold with plastic variable angle includes an inner template 1, an outer template 2, bolts and tie rods 4, and a prefabricated nozzle pipe 5. The inner template 1 and outer template 2 are perpendicular to the bottom plate 7 of the box body 8. The inner template 1 and outer template 2 are made of 6mm steel plate. The inner template 1 is set inside the burner position, and the cross-sectional dimensions of the inner template 1 are the same as those of the burner. The outer template 2 is set outside the burner position, at the outer edge 9 of the furnace inner wall, and the height of the outer template 2 is 1 / 5 to 1 / 4 of the burner height. This facilitates the laying of plastic refractory material 6 from one side of the outer template 2. Before installing the burner brick mold, the dust and iron oxide scale at the burner brick in the regenerative chamber are cleaned to maintain the integrity and verticality of the internal structure of the regenerative body. The inner template 1 is installed inside the burner position, and the distance between the inner template 1 and the outer edge 9 of the furnace inner wall is 50mm to 500mm. The inner template 1 and the box body 8 are perpendicular to the bottom plate 7. The gaps between the four sides of the body 8 are ≤3mm to prevent refractory material from overflowing during plasticization; the gaps between the outer template 2 and the two sides of the body 8 are ≤1mm; multiple corresponding fixing holes 3 are provided at the lower part of the inner template 1 and the outer template 2, and bolts and tie rods 4 are installed in the fixing holes 3 to connect the inner template 1 and the outer template 2. The bolts and tie rods 4 adjust the distance between the inner template 1 and the outer template 2 to determine the thickness of the burner brick. Multiple pre-fabricated nozzle pipes 5 are provided on the inner template 1. The pre-fabricated nozzle pipes 5 point towards the outer template 2 at different angles, and the angles of the multiple pre-fabricated nozzle pipes 5 will be concentrated towards the centerline of the burner; the nozzle size, shape and nozzle angle α of the pre-fabricated nozzle pipes 5 are adjusted according to the heat distribution and flame rigidity of the regenerative heating furnace to ensure that when air and gas are mixed and burned in the furnace, the end point of the flame can exceed the centerline of the heating furnace. A layer of plastic refractory material 6 is laid between the inner template 1 and the outer template 2 with staggered joints. Based on the performance requirements of the regenerative burner bricks, the plastic refractory material 6 to be laid is selected, and its permanent thermal deformation, compressive strength, and rapid heating / cooling properties are obtained. The plastic refractory material 6 is cut into blanks with dimensions of 30mm × 50mm × 50mm using a cutting tool. The blanks are laid layer by layer with staggered joints from the bottom up. During the laying process, the material is tamped with a tamping hammer, with each layer tamped at least 6 times. The plasticity preparation of the regenerative furnace burner bricks begins with the bottom plate 7, and after the bottom layer is plasticized and dense, the bricks are laid upwards, avoiding the bolts and tie rods 4 to prevent deformation of the bolts and tie rods 4.

[0025] The number of nozzle pre-constructed tubes 5 ranges from 1 to 25; the diameter of the nozzle pre-constructed tubes ranges from 5 mm to 89 mm; and the setting angle α of the nozzle pre-constructed tubes 5 ranges from 0 to 45°.

[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A mold for a regenerative furnace burner brick with malleable variable angle, comprising an inner mold, an outer mold, bolts and tie rods, and a pre-fabricated nozzle pipe, characterized in that, The inner and outer templates are perpendicular to the bottom plate of the box body. The inner template is set inside the burner position and has the same cross-sectional dimensions as the burner. The outer template is set outside the burner position and its height is 1 / 5 to 1 / 4 of the burner height. The lower part of the inner and outer templates is provided with multiple corresponding fixing holes. Bolts and tie rods are installed in the fixing holes to connect the inner and outer templates. The bolts and tie rods adjust the distance between the inner and outer templates to determine the thickness of the burner brick. Multiple precast nozzle pipes are set on the inner template, and the precast nozzle pipes point towards the outer template at different angles. A layer of plastic refractory material is laid between the inner and outer templates with staggered joints.

2. The regenerative furnace burner brick mold with plastic variable angle according to claim 1, characterized in that, The nozzle size, shape, and nozzle angle α of the prefabricated nozzle pipe are adjusted according to the heat distribution and flame rigidity of the regenerative heating furnace.

3. The regenerative furnace burner brick mold with plastic variable angle according to claim 1, characterized in that, The distance between the inner template and the outer edge of the furnace inner wall is 50mm to 500mm, and the gap between the inner template and the sides of the burner in the box body is ≤3mm.

4. A regenerative furnace burner brick mold with plastic variable angle according to claim 1, characterized in that, The gap between the outer template and the two sides of the box body is ≤1mm.

5. A regenerative furnace burner brick mold with plastic variable angle according to claim 1, characterized in that, The number of pre-fabricated nozzle tubes is 1 to 25; the diameter of the pre-fabricated nozzle tubes is 5 mm to 89 mm; and the setting angle α of the pre-fabricated nozzle tubes is 0 to 45°.

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