Repair method of top combustion type hot blast stove burner

Abstract

The invention relates to a method for repairing a top combustion hot blast stove burner, and belongs to the technical field of blast furnaces in the metallurgical industry and the blast furnace ironmaking industry. According to the technical scheme, the method is operated according to the following steps that a, a plurality of gas burner mounting holes penetrating through the furnace are formed in the circumferential direction of a furnace shell of the hot blast furnace; b, enabling the gas ring pipe (1) to surround the hot-blast stove by one circle and fixing the gas ring pipe (1) on a hot-blast stove shell through a pipeline bracket (2); c, the gas ring pipe (1) is communicated with the gas stand pipe (4) through the elbow (3); d, a plurality of gas nozzles are evenly arranged in the circumferential direction of the gas ring pipe (1), and the gas nozzles penetrate through the gas nozzle mounting holes in the step a to be communicated with a hot blast stove mixing chamber (11); and e, filling refractory castable (9) between the gas burner and the furnace shell of the hot blast furnace. The invention has the following beneficial effects: the outside-furnace gas loop pipe is used to replace the inside-furnace gas loop pipe, so that the damage of gas to the wall is reduced, the stability of the wall is increased, and the combustion efficiency is improved.

Description

Technical Field

[0001] The invention relates to a repairing method for a top-fired hot blast stove burner, belonging to the technical field of hot blast stoves in blast furnace ironmaking industry in the metallurgical industry. Background Art

[0002] At present, top-fired hot blast stoves are widely used in the field of blast furnace ironmaking. They have the advantages of compact structure, high wind temperature and low investment.

[0003] Most of the domestic top-fired hot air furnaces use built-in burners, which are mainly composed of gas ring, gas nozzle, combustion air ring, combustion air nozzle, mixing chamber, throat, etc. Figure 1 As shown in the figure, the gas annulus and combustion air annulus are equipped with multiple nozzles near the inner side of the furnace wall. The gas is injected into the burner mixing chamber through the gas annulus and gas nozzles. Guided by the cylindrical surface within the mixing chamber, it forms a downward-moving tubular vortex. The combustion air is injected radially into the burner mixing chamber through the air annulus and combustion air nozzles, cutting into the center of the tubular vortex, effectively cutting the gas tubular vortex, mixing with the gas, and then entering the combustion chamber through the throat for combustion.

[0004] While this burner is highly efficient, each transition between the draft and combustion phases causes significant temperature fluctuations in the gas or combustion air loops and nozzles. During the draft phase, the gas or combustion air loops and nozzles heat up to approximately 1000°C due to heat transfer from the furnace. During the combustion phase, the gas or combustion air loops and nozzles experience large volumes of gas or combustion air, keeping the temperature generally below 200°C. The refractory material in these loops and nozzles cools to around 200°C. Each transition between the draft and combustion phases causes the refractory material to experience a temperature fluctuation of 200°C to 1000°C. This repeated thermal shock can damage the strength of the refractory bricks. Furthermore, because the gas contains moisture, the refractory material in the gas loops and nozzles also undergoes a certain degree of water cooling.

[0005] Affected by the above factors, the top-fired hot blast stove burner will experience nozzle collapse 5-7 years after it is put into production. The collapse of the gas nozzle is more serious, affecting the normal use of the hot blast stove. Summary of the Invention

[0006] The purpose of the present invention is to provide a method for repairing a top-fired hot blast furnace burner, replacing the internal gas ring channel with an external gas ring pipe, thereby reducing gas damage to the wall, increasing wall stability, improving combustion efficiency, and solving the problems existing in the background technology.

[0007] The technical solution of the present invention is: A method for repairing a top-fired hot blast stove burner is performed in the following steps: a. Open multiple gas burner installation holes in the circumferential direction of the hot blast furnace shell; b. The gas ring pipe surrounds the hot blast furnace and is fixed to the hot blast furnace shell through a pipe bracket; c. Connect the gas ring pipe to the gas riser through the elbow; d. Several gas nozzles are arranged evenly in the circumferential direction of the gas ring tube, and several gas nozzles are connected to the mixing chamber of the hot blast furnace through the gas burner mounting hole in step a; e. Fill refractory castables between the gas burner and the hot blast furnace shell.

[0008] The gas burner mounting holes in step a are evenly arranged and their center lines are tangent to the same circle; The gas nozzle in step d comprises a burner vertical section, a head and a burner horizontal section in an integrated structure. The burner vertical section is connected to the gas ring pipe, and the burner horizontal section passes through the gas burner installation hole in step a and is connected to the hot air furnace mixing chamber.

[0009] A burner refractory lining is provided on the outside of the gas nozzle.

[0010] The beneficial effects of the present invention are: replacing the internal gas ring with an external gas ring pipe, reducing gas damage to the wall and increasing wall stability. The present invention also incorporates multiple gas burners, each with its centerline tangent to the same tangent circle, ensuring effective gas mixing and efficient hot blast furnace combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of a vault structure of background technology; Figure 2 This is an elevation view of the gas ring pipe of the present invention; Figure 3 This is an elevation view of the gas ring pipe and gas burner of the present invention; Figure 4 This is a cross-sectional view of a gas burner according to the present invention; In the figure: gas ring pipe 1, pipe support 2, elbow 3, gas riser 4, burner vertical section 5, head 6, burner horizontal section 7, burner refractory lining 8, refractory castable 9, air duct 10, hot blast furnace mixing chamber 11, gas ring duct 12, gas nozzle 13, air nozzle 14, air ring duct 15, gas pipe 16. DETAILED DESCRIPTION

[0012] The present invention will be further described below with reference to the accompanying drawings and through examples.

[0013] Refer to the attached Figure 1-4 , a method for repairing a top-fired hot blast stove burner, follow these steps: a. Open multiple gas burner installation holes in the circumferential direction of the hot blast furnace shell; b. The gas ring pipe 1 surrounds the hot blast furnace and is fixed to the hot blast furnace shell through the pipe bracket 2; c. Connect the gas ring pipe 1 to the gas riser 4 through the elbow 3; d. A plurality of gas nozzles are arranged evenly in the circumferential direction of the gas ring tube 1, and a plurality of gas nozzles are connected to the hot blast furnace mixing chamber 11 through the gas burner mounting hole in step a; e. Fill refractory castable 9 between the gas burner and the hot blast furnace shell.

[0014] In this embodiment, refer to the attached Figure 1-4 , in the background technology Figure 1 The gas pipe inlet is sealed with a steel shell of the same strength as the original furnace shell and a refractory material of the same material and thickness. The gas ring pipe 1 is wrapped around the hot blast furnace dome and fixed to the hot blast furnace shell through the pipe bracket 2. The gas ring pipe 1 passes through the elbow 3 and the gas riser 4.

[0015] As shown in the figure, the gas burner consists of a burner vertical section 5, a head 6, a burner horizontal section 7 and a burner refractory lining 8.

[0016] The figure shows that multiple gas burner mounting holes are opened circumferentially through the furnace shell. The centerlines of the mounting holes are higher than the centerlines of the existing gas nozzles. The gas burner mounting holes are evenly spaced and their centerlines are tangent to the same circle. The centerlines of the gas burner mounting holes can also coincide with the centerlines of some existing gas nozzles. The diameter of the gas burner mounting holes is large enough to meet the requirements for gas burner installation. The gas burner is installed into the furnace through the furnace shell opening. The burner's horizontal section 7 is connected to the hot blast furnace mixing chamber 11, and the burner's vertical section 5 is connected to the gas ring pipe 1. Gas enters the hot blast furnace mixing chamber 11 through the gas burner's vertical section 5 and horizontal section 7.

[0017] The figure shows that the burner is installed, and the gas nozzles, gaps between bricks, gaps between the gas ring and the gas burner, and the remaining space of the gas ring are filled with refractory castings to make the wall a whole again.

Claims

1. A method for repairing a top-fired hot blast stove burner, characterized in that: Follow these steps: a. Open multiple gas burner installation holes in the circumferential direction of the hot blast furnace shell; b. The gas ring pipe (1) surrounds the hot blast furnace and is fixed to the hot blast furnace shell through the pipe bracket (2); c. Connect the gas ring pipe (1) to the gas riser (4) through the elbow (3); d. A plurality of gas nozzles are arranged evenly in the circumferential direction of the gas ring tube (1), and a plurality of gas nozzles are connected to the hot air furnace mixing chamber (11) through the gas burner mounting hole in step a; e. Fill refractory castable (9) between the gas burner and the hot blast furnace shell.

2. The method for repairing a top-fired hot blast stove burner according to claim 1, characterized in that: The gas burner mounting holes in step a are evenly arranged and their center lines are tangent to the same circle.

3. The method for repairing a top-fired hot blast stove burner according to claim 1, characterized in that: The gas nozzle in step d comprises a burner vertical section (5), a head (6) and a burner horizontal section (7) in an integrated structure, the burner vertical section (5) being connected to the gas ring pipe (1), and the burner horizontal section (7) passing through the gas burner mounting hole in step a being connected to the hot blast furnace mixing chamber (11).

4. The method for repairing a top-fired hot blast stove burner according to claim 1, characterized in that: A burner refractory lining (8) is provided on the outside of the gas nozzle.

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