Installation method of large-scale blast furnace bottom hearth dry-masonry carbon brick flexible galvanic couple

Abstract

The invention relates to an installation method of a large-scale blast furnace bottom hearth dry-laying carbon brick flexible couple, which specifically comprises the following steps: 1) forming a hole in a gap of a cooling wall in the circumferential direction of a blast furnace shell, and installing a concentrated lead-out protection tube; (2) slotting the upper surface of the dry carbon brick at the detection point, putting a galvanic couple into the slot, and filling and leveling up the slot by ramming materials after the galvanic couple is arranged; and 3) introducing the galvanic couple laid at the detection point position to a gap between the edge of the carbon brick and the cooling wall, then inserting the galvanic couple into a centralized lead-out protection tube nearby along the circumferential direction, and uniformly leading out the galvanic couple of all the detection points through the centralized lead-out protection tube to be connected into a nearby instrument box. The invention has the beneficial effects of being suitable for dry building of the carbon bricks in the hearth, being directly buried in the carbon bricks, and being seamless and slurry-free. And the masonry standard can be better improved, and the service life of the hearth is prolonged. The galvanic couple is flexible in arrangement and can be bent at will, and the service life of the galvanic couple is prolonged. The application range is wide and the matching degree is high. The dry carbon brick is suitable for various large blast furnace hearths.

Description

Technical Field

[0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to a method for installing a large blast furnace (blast furnace with a capacity of more than 2000 cubic meters) bottom furnace hearth dry-laid carbon brick flexible electric couple in large blast furnace (blast furnace with a capacity of more than 2000 cubic meters) bottom furnace hearth detection. Background Art

[0002] Blast furnace production is of vital importance in the steel industry. The longevity of blast furnaces is the goal pursued by blast furnace production. The biggest factor affecting the longevity of blast furnaces is the safety of the hearth. Good monitoring of the temperature of blast furnace hearth carbon bricks to determine the state of hearth erosion is the most important production method for blast furnace ironmaking at this stage.

[0003] Blast furnace carbon bricks are usually laid in two ways: dry laying and wet laying. Compared with wet laying, dry laying has higher requirements on the laying standards of carbon bricks, has lower thermal resistance, and is more conducive to the longevity of the blast furnace. Generally, dry laying carbon bricks are used for the masonry of the hearth of large blast furnaces to ensure the longevity of the blast furnace hearth.

[0004] The traditional furnace temperature detection is to make grooves on the built carbon bricks. After the carbon brick groove is cleaned, the galvanic couple with the galvanic protection tube is passed through the furnace shell and inserted into the carbon brick groove, and then the groove is filled with carbon cement. The disadvantages of this method include: 1) Too many holes are opened in the furnace shell in the furnace area. If each layer of carbon bricks needs to be tested, holes need to be opened in each layer, which is difficult to construct and poses safety hazards; 2) In order to smoothly pass the galvanic protection tube, the carbon brick groove needs to be opened too large, which may damage the carbon brick structure and affect the performance of the carbon brick. Summary of the invention

[0005] The purpose of the present invention is to provide a method for installing flexible thermocouples of dry-laid carbon bricks in the hearth of a large blast furnace. The furnace shell in the hearth area of ​​the blast furnace has few openings, is easy to install, and is suitable for the installation and arrangement of thermocouples of dry-laid carbon bricks. The present invention can avoid the construction difficulties and corresponding safety hazards caused by too many openings in the furnace shell in the hearth area. The selected flexible thermocouples can be opened in a concentrated manner, can be bent and arranged in multiple layers at will, and the thermocouples are small and suitable for dry-laid carbon bricks. A small groove is opened above the carbon brick without affecting the carbon brick structure, and the thermocouple armor is not easily damaged. It is beneficial for the blast furnace operator to accurately judge the state of the blast furnace hearth and is beneficial to the longevity of the blast furnace.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for installing a flexible thermocouple of dry-laid carbon bricks in a large blast furnace bottom and hearth, specifically comprising:

[0008] 1) Drill holes at the cooling wall gaps in the circumferential direction of the blast furnace shell and install centralized lead-out protection pipes;

[0009] 2) Make a groove on the upper surface of the dry carbon brick at the detection point, put the galvanic couple into the groove, and fill the groove with ramming material after arrangement;

[0010] 3) Lead the thermocouples laid at the detection point to the gap between the edge of the carbon brick and the cooling wall, and then insert them into the centralized lead-out protection tube nearby along the circumferential direction. Through the centralized lead-out protection tube, the thermocouples of all detection points are uniformly led out and connected to the nearest instrument box.

[0011] The galvanic couple is a flexible galvanic couple with a diameter of 5 to 7 mm.

[0012] The diameter of the groove is 10-15 mm.

[0013] No more than 50 thermocouples are arranged in one of the centralized lead-out protection tubes.

[0014] The centralized lead-out protection pipe has a diameter of 55-65 mm and a length of 450-550 mm, and is welded on the cooling fireplace shell.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1) Suitable for dry-laying carbon bricks in the furnace, directly into the carbon bricks, no gaps, no mud. It can better improve the masonry standards and extend the life of the furnace.

[0017] 2) The arrangement of the thermocouple is flexible and the thermocouple can be bent at will, which increases the service life of the thermocouple.

[0018] 3) Wide application range and high matching degree. Suitable for dry-laid carbon bricks in various large blast furnace hearths. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 for Figure 1 Side view.

[0021] Figure 3 Install facade for dry laid carbon brick galvanic couple.

[0022] Figure 4 Provides a flat surface for mounting dry carbon brick thermocouples.

[0023] Figure 5 Flat lay out for installation of dry carbon brick thermocouple.

[0024] Figure 6 This is a schematic diagram of the arrangement of galvanic detection points.

[0025] Figure 7 It is used for installing the protection tube with concentrated opening for the thermocouple.

[0026] In the figure: 1, carbon brick; 2, groove; 3, ramming material; 4, galvanic couple; 5, concentrated opening protection tube; 6, gasket; 7, furnace shell; 8, cooling wall; 9, the 9th layer of carbon bricks around the hearth area; 10, the 8th layer of carbon bricks around the hearth area; 11, the 7th layer of carbon bricks around the hearth area; 12, the 6th layer of carbon bricks around the hearth area; 13, the 5th layer of carbon bricks around the hearth area; 14, the 4th layer of carbon bricks around the hearth area; 15, the 3rd layer of carbon bricks around the hearth area; 16, the 2nd layer of carbon bricks around the hearth area; 17, the 1st layer of carbon bricks around the hearth area; 18, the 4th layer of the furnace bottom area is fully covered with carbon bricks; 19, the 3rd layer of the furnace bottom area is fully covered with carbon bricks; 20, the 2nd layer of the furnace bottom area is fully covered with carbon bricks; 21, the 1st layer of the furnace bottom area is fully covered with carbon bricks. Points A, B, C, D, and E are schematic diagrams of the locations of the galvanic couple temperature detection points. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the specific implementation methods of the present invention are further described below in conjunction with embodiments. The following embodiments are used to specifically illustrate the contents of the present invention. These embodiments are only general descriptions of the contents of the present invention and do not limit the contents of the present invention.

[0028] like Figure 1-Figure 7 As shown, a method for installing a flexible thermocouple of dry-laid carbon bricks in a large blast furnace bottom and hearth, specifically comprising:

[0029] 1) Open holes at the gaps of the cooling wall 8 in the circumferential direction of the blast furnace shell 7, and install a centralized lead-out protection pipe 5;

[0030] 2) A groove 2 is made on the upper surface of the dry-laid carbon brick 1 at the detection point, and the galvanic couple 4 is placed in the groove 2. After the arrangement is completed, the groove 2 is filled with ramming material 3;

[0031] 3) Lead the thermocouple 4 laid at the detection point to the gap between the edge of the carbon brick 1 and the cooling wall 8, and then insert it into the centralized lead-out protection tube 5 nearby along the circumferential direction. Through the centralized lead-out protection tube 5, the thermocouples 4 of all detection points are uniformly led out and connected to the nearest instrument box.

[0032] The galvanic couple 4 is a flexible galvanic couple with a diameter of 5 to 7 mm.

[0033] The diameter of the groove 2 is 10-15 mm.

[0034] No more than 50 thermocouples 4 are arranged in one centralized lead-out protection tube 5 .

[0035] The centralized lead-out protection tube 5 has a diameter of 55-65 mm and a length of about 450-550 mm, and is welded to the cooling fireplace shell 7 .

[0036] A method of arranging thermocouples of dry-laid carbon bricks in the hearth of a large blast furnace: concentrated holes are opened in the furnace shell 7, generally in the circumferential direction of the blast furnace shell 7 and in the gaps of the cooling wall 8. The number of holes is generally related to the number of temperature detection points in the hearth area. The diameter of each hole is generally slightly larger than the diameter of the installed centralized lead-out protection tube 5. Generally, no more than 50 thermocouples 4 can be arranged in each centralized lead-out protection tube 5. The temperature detection points of the furnace bottom carbon bricks and the hearth ring carbon bricks are generally around 200, so it is only necessary to arrange 8 centralized lead-out protection tubes 5 around the corresponding elevation. It is also possible to arrange 4 centralized lead-out protection tubes 5 around the corresponding elevation in two layers, and the specific selection can be made according to the situation of the blast furnace. A gasket 6 is welded to the outer wall of the centralized lead-out protection tube 5, and the gasket 6 is welded and fixed to the outer wall of the furnace shell 7, such as Figure 7 shown.

[0037] Example:

[0038] A method for arranging electric couples for dry-laid carbon bricks in the bottom and hearth of a large blast furnace comprises the following steps:

[0039] (1) Holes are opened at the cooling wall gaps in the circumferential direction of the blast furnace shell to install the centralized lead-out protection tube 5. The number of holes is related to the number of temperature detection points in the furnace area. It is divided into two layers, with four centralized lead-out protection tubes 5 arranged on each layer. Figure 3-Figure 6 The location of the centralized lead-out hole.

[0040] (2) When laying carbon bricks 1, a groove 2 of about φ15 mm is opened on the upper surface of the carbon brick 1 after laying one layer of carbon bricks. The groove is opened according to the arrangement of the galvanic couple 4, and the galvanic couple 4 is placed in the groove 3. After the arrangement is completed, the groove is filled with carbon ramming material 3.

[0041] (3) After the carbon brick 1 is grooved, the galvanic couple 4 is buried and arranged according to the design drawings or the inspection point positions required by the owner. The arrangement method is to lay the galvanic couple 4 from the inspection point position to the gap between the edge of the carbon brick 1 and the cooling wall 8, and then insert it into the centralized lead-out protection tube 5 nearby along the circumferential direction. After all the inspection points are arranged, they are uniformly led out by the centralized lead-out protection tube 5 to the nearest instrument box.

[0042] The centralized lead-out protection pipe 5 is generally about 60 mm in diameter and 500 mm in length and is welded to the furnace shell.

[0043] The galvanic couple 4 is a flexible galvanic couple, and the diameter is generally about φ6 mm.

[0044] Since the diameter of the galvanic couple 4 is not large, the performance of the carbon brick 1 will not be affected after the grooves are filled with ramming material.

[0045] The arrangement of the electric couple of the dry-laid carbon bricks in the blast furnace bottom hearth of the present embodiment is as follows Figure 3-Figure 6As shown: Each point of A, B, C, D, E corresponds to a thermocouple 4. A centralized lead-out protection pipe 5 is installed at the elevation of 20 on the second layer of fully paved carbon bricks in the furnace bottom area, and a centralized lead-out protection pipe 5 is installed at the elevation of 16 on the second layer of carbon bricks in the furnace cylinder area. Figure 6 , the first layer of the furnace bottom area is fully covered with 21 carbon bricks, and a total of 37 detection points are set in 12 directions of the circumference. The second layer of the furnace bottom area is fully covered with 20 carbon bricks, and a total of 49 detection points are set in 12 directions of the circumference. The third layer of the furnace bottom area is fully covered with 19 carbon bricks, and a total of 33 detection points are set in 8 directions of the circumference. The fourth layer of the furnace bottom area is fully covered with 18 carbon bricks, and a total of 49 detection points are set in 12 directions of the circumference. The first layer of carbon bricks in the furnace cylinder area is 17, and a total of 40 detection points are set in 20 directions of the circumference. The second layer of carbon bricks in the furnace cylinder area is 16, and a total of 40 detection points are set in 20 directions of the circumference. The third layer of carbon bricks in the furnace cylinder area is 15, and a total of 48 detection points are set in 24 directions of the circumference. The fourth layer of carbon bricks in the furnace cylinder area is 14, and a total of 48 detection points are set in 24 directions of the circumference. The 5th layer of carbon bricks in the hearth area 13, a total of 24 detection points are set in 12 directions of the circumference. The 6th layer of carbon bricks in the hearth area 12, a total of 16 detection points are set in 8 directions of the circumference. The 7th layer of carbon bricks in the hearth area 11, a total of 8 detection points are set in 4 directions of the circumference. The 8th layer of carbon bricks in the hearth area 10, a total of 8 detection points are set in 4 directions of the circumference. The 9th layer of carbon bricks in the hearth area 9, a total of 8 detection points are set in 4 directions of the circumference.

Claims

1. A method for installing a flexible thermocouple of dry-laid carbon bricks in the bottom and hearth of a large blast furnace, characterized in that: Specifically include: 1) Drill holes at the cooling wall gaps in the circumferential direction of the blast furnace shell and install centralized lead-out protection pipes; 2) Make a groove on the upper surface of the dry-laid carbon bricks at the detection point, put the galvanic couple into the groove, and fill the groove with ramming material after arrangement; 3) Lead the thermocouples laid at the detection point to the gap between the edge of the carbon brick and the cooling wall, and then insert them into the centralized lead-out protection tube nearby along the circumferential direction. Through the centralized lead-out protection tube, the thermocouples of all detection points are uniformly led out and connected to the nearest instrument box.

2. The method for installing a flexible thermocouple of dry-laid carbon bricks in a large blast furnace bottom and hearth according to claim 1, characterized in that: The galvanic couple is a flexible galvanic couple with a diameter of 5 to 7 mm.

3. The method for installing a flexible thermocouple of dry-laid carbon bricks in a large blast furnace bottom and hearth according to claim 1, characterized in that: The diameter of the groove is 10-15 mm.

4. The method for installing a flexible thermocouple of dry-laid carbon bricks in a large blast furnace bottom and hearth according to claim 1, characterized in that: No more than 50 thermocouples are arranged in one of the centralized lead-out protection tubes.

5. The method for installing a flexible thermocouple of dry-laid carbon bricks in a large blast furnace bottom and hearth according to claim 1, characterized in that: The centralized lead-out protection pipe has a diameter of 55-65 mm and a length of 450-550 mm, and is welded on the cooling fireplace shell.

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