Water cooling method and device for secondary smoke collecting chamber of converter

Abstract

The invention relates to the technical field of steelmaking production processes, and discloses a converter secondary smoke collecting chamber water cooling device which comprises an annular water cooling beam, a sealing plate and a water cooling box beam. The sealing plate is matched with the annular water-cooling beam in shape, after the annular water-cooling beam is fixed to the bottom of the sealing plate, the water-cooling box beam is fixed to the position, close to the two ends, of the top of the sealing plate, and the two ends of the annular water-cooling beam are connected with the water-cooling box beam through a water inlet pipe and a water outlet pipe respectively. The water cooling method for the secondary smoke collecting chamber of the converter specifically comprises the following steps. Compared with the prior art, the device has the advantages that 1, the investment is small, the water cooling effect is good, maintenance is avoided, the risk that the secondary smoke collecting chamber beam is frequently burnt out by high-temperature flames is solved, and the device is suitable for industrial large-scale continuous operation; and 2, automatic operation can be realized, the operation process is simple, and the water cooling effect of the equipment is good.

Description

Technical Field

[0001] The invention relates to the technical field of steelmaking production processes, and in particular to a method and device for water cooling a secondary smoke collecting chamber of a converter. Background Art

[0002] Currently, all steelmaking processes utilize the unburned process. Under this process, oxygen delivered by the converter's oxygen lance reacts with the molten iron in the converter to produce carbon and oxygen. Large amounts of CO and other gases are then sealed through the skirt and released into the gasification and cooling flue, where heat and gas are recovered. Due to smelting requirements, the skirt must be raised and lowered for each furnace. If the exhaust fan's air volume is not properly matched, the flue gas can "backfire" at the furnace mouth. The high-temperature flue gas and flames can heat the steel structure of the secondary smoke collection chamber for extended periods, frequently damaging the steel beams and shortening the chamber's lifespan, leading to serious safety incidents and economic losses. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the above technical difficulties and provide a method and device for water cooling the secondary smoke collection chamber of a converter. The method and device are a water cooling device with extremely high safety and can work in a high-temperature environment for a long time. The method is a process that avoids frequent shutdowns due to high-temperature baking in the secondary smoke collection chamber of the converter.

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0005] A device for water cooling a secondary smoke collecting chamber of a converter comprises an annular water-cooled beam, a sealing plate and a water-cooled box beam; the sealing plate is adapted to the shape of the annular water-cooled beam, and after the annular water-cooled beam is fixed to the bottom of the sealing plate, the water-cooled box beam is fixed to the top of the sealing plate near both ends, and the two ends of the annular water-cooled beam are respectively connected to the water-cooled box beam via a water inlet pipe and a water outlet pipe.

[0006] The annular water-cooled beam includes a water-cooled beam body and a partition; two partitions are evenly arranged in the water-cooled beam body and separate the water-cooled beam body. After a water inlet is provided on the water-cooled beam body corresponding to one partition, a water outlet is provided on the water-cooled beam body corresponding to the other partition.

[0007] The sealing plate includes a steel plate and a tortoise shell mesh; the tortoise shell mesh is arranged to cover the inner surface of the steel plate, and refractory material is sprayed inside the tortoise shell mesh.

[0008] The water-cooled box beam includes a cover plate, a side plate, a cavity sealing plate and a guide plate; after a pair of the cover plates and a pair of side plates form a square tube, the inner cavity is closed at both ends of the square tube by fixing the cavity sealing plates respectively, and a guide plate fixed in the square tube is provided between the two cavity sealing plates. There are multiple guide plates evenly arranged along the axial direction of the square tube, and an overflow gap is left between the guide plates and the upper cover plate, and a water hole is reserved in the middle. A water inlet is provided on the upper cover plate, and a water outlet is provided on the lower cover plate.

[0009] A method for water cooling the secondary smoke collecting chamber of a converter, specifically the following method:

[0010] Based on (1)

[0011]

[0012] Q1 - Pipeline heat (W) The heat passing through the pipeline per unit time and per meter

[0013] k——thermal conductivity (W / mk) is determined by the material and is taken as 42

[0014] T 内 ——Unknown temperature of the inner wall of the pipe (℃)

[0015] T 外 ——Unknown temperature of the outer wall of the pipe (℃)

[0016] r 外 ——The known value of pipe outer diameter (m)

[0017] r 内 ——The known number of pipe inner diameter (m)

[0018] “-” – The negative sign indicates that heat is transferred from high temperature to low temperature;

[0019] Based on (2)

[0020] Q2=h1A(T 液 -T 内 )

[0021] Q2 - Pipeline heat (W) The heat that passes through the liquid to the inner wall of the pipe per unit time and per meter

[0022] A - Convection heat transfer area between the inner surface of the pipe and the fluid.

[0023] h1——heat transfer coefficient (W / mk) The heat transfer coefficient between water and tube surface is taken as 5000

[0024] T 液 ——Temperature of medium in pipeline (℃): This time, water is considered and the value is 30

[0025] T 内 ——Unknown temperature of the inner wall of the pipe (℃)

[0026] A=2πr 内

[0027] The above can be obtained:

[0028] Q2=h12πr 内 (T 液 -T 内 );

[0029] Based on (3)

[0030] Q3=h2A(T 外 -T 烟 )

[0031] Q3 - Pipeline heat (W) The heat that passes through the outer wall of the pipe to the environment per unit time and per meter

[0032] h2——heat transfer coefficient (W / mk) The heat transfer coefficient between flue gas and tube surface is taken as 100 in this case.

[0033] T 外 ——Pipeline outer wall temperature (℃) unknown

[0034] T 烟 ——Ambient temperature outside the pipe (℃) This time the flue gas value is 350

[0035] The above can be obtained:

[0036] Q3=h22πr 外 (T 外 -T 烟 )

[0037] Due to the uniform heat conduction, the heat conduction at each level is the same, so Q = Q1 = Q2 = Q3

[0038] Available

[0039]

[0040] Q - Pipeline heat (W) is the amount of heat that passes through the pipe to the environment per meter per unit time;

[0041] Based on (4)

[0042] Q=cmΔt

[0043] c——Specific heat of fluid (J / kg℃) The liquid in the tube is considered as water, and 4200 is taken.

[0044] m——fluid mass kg

[0045] Δt——the temperature difference between the inlet and outlet of the fluid after heat exchange (℃) is taken as 15 in this case;

[0046] Based on (4)

[0047] D=4A / S

[0048] D——equivalent diameter of square tube

[0049] A——The effective area of ​​the fluid passing through the square tube

[0050] S - the length of contact between fluid and wall

[0051] In summary, this smoke collection chamber adopts circulating water cooling, with an inlet water pressure of 0.8Mpa and an outlet water pressure of 0.3Mpa. The water-cooled ring beam and box beam are connected in series. The length of the box beam is calculated as 8m, requiring 35.8m3 / h of cooling water, which can effectively prevent the service life of the secondary smoke collection chamber from being affected by "backfire" at the furnace mouth.

[0052] The advantages of the present invention compared with the prior art are:

[0053] 1. The present invention has low investment, good water cooling effect, and is maintenance-free. It solves the risk of the secondary smoke collection chamber beams being frequently burned by high-temperature flames and is suitable for large-scale continuous industrial operations.

[0054] 2. The present invention can realize automatic operation, the operation process is simple and the equipment has good water cooling effect.

[0055] 3. The present invention realizes for the first time that the converter secondary smoke collecting chamber is transformed from ordinary steel beams to water-cooled beams.

[0056] 4. The present invention provides a safe way to prevent water vapor from coexisting in the water-cooled beam without tube bursting under high temperature conditions in the secondary smoke collection chamber of the converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a structural schematic diagram of the present invention.

[0058] Figure 2 It is a top cross-sectional view of the annular water-cooled beam of the present invention.

[0059] Figure 3 It is a top cross-sectional view of the sealing plate of the present invention.

[0060] Figure 4 It is a top sectional view of the water-cooled box beam of the present invention.

[0061] Figure 5 It is a side sectional view of the water-cooled box beam of the present invention.

[0062] As shown in the figure: 1. Annular water-cooled beam; 2. Closing plate; 3. Water-cooled box beam; 4. Water inlet pipe; 5. Water outlet pipe; 11. Water-cooled beam body; 12. Partition; 13. Water inlet; 14. Water outlet; 21. Steel plate; 22. Tortoise shell mesh; 31. Cover plate; 32. Side plate; 33. Cavity sealing plate; 34. Guide plate; 35. Water inlet pipe; 36. Water outlet pipe. DETAILED DESCRIPTION

[0063] In the description of the present invention, it should be understood that the terms "center", "lateral", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In addition, the term "including" and any variations thereof are intended to cover non-exclusive inclusions.

[0064] The present invention will be further described in detail below with reference to the embodiments and the accompanying drawings.

[0065] A device for water cooling a secondary smoke collecting chamber of a converter comprises an annular water-cooled beam 1, a closing plate 2 and a water-cooled box beam 3; the closing plate 2 is adapted to the shape of the annular water-cooled beam 1, and after the annular water-cooled beam 1 is fixed to the bottom of the closing plate 2, the water-cooled box beam 3 is fixed to the top of the closing plate 2 near both ends, and the two ends of the annular water-cooled beam 1 are respectively connected to the water-cooled box beam 3 via a water inlet pipe 4 and a water outlet pipe 5.

[0066] in:

[0067] The annular water-cooled beam 1 comprises a water-cooled beam body 11 and partitions 12. Two partitions 12 are evenly spaced within the water-cooled beam body 11, separating the water-cooled beam body 11. A water inlet 13 is provided on the water-cooled beam body 11 corresponding to one partition 12, and a water outlet 14 is provided on the other partition 12. Specifically, the annular water-cooled beam 1 is made of 20# steel, and its dimensions are adjusted according to the diameter of the furnace mouth. The water-cooled beam body 11 is fixed to the support beam of the secondary smoke collection chamber, and also serves to strengthen the structural strength of the secondary smoke collection chamber. The partitions 12 are four pieces. Steel plates;

[0068] The sealing plate 2 includes a steel plate 21 and a tortoise shell mesh 22. The tortoise shell mesh 22 covers the inner surface of the steel plate 21 and is sprayed with refractory material. The sealing plate 2 is made of Q235B material and its height can be adjusted according to the upper flue replacement trolley platform.

[0069] The water-cooled box beam 3 comprises a cover plate 31, side plates 32, a cavity sealing plate 33, and a guide plate 34. A pair of cover plates 31 and side plates 32 form a square tube. The inner cavity is sealed by a fixed cavity sealing plate 33 at each end of the square tube. A guide plate 34 is fixed inside the square tube between the two cavity sealing plates 33. Multiple guide plates 34 are evenly spaced along the axial direction of the square tube, leaving an overflow gap between them and the upper cover plate. A water hole is also reserved in the middle. A water inlet 35 is provided on the upper cover plate 31, and a water outlet 36 is provided on the lower cover plate 31. The water-cooled box beam 3 is made of 20# steel and its dimensions can be adjusted to the size of the converter's secondary smoke collection chamber.

[0070] A method for water cooling the secondary smoke collecting chamber of a converter, specifically the following method:

[0071] Based on (1)

[0072]

[0073] Q1 - Pipeline heat (W) The heat passing through the pipeline per unit time and per meter

[0074] k——thermal conductivity (W / mk) is determined by the material and is taken as 42

[0075] T 内 ——Unknown temperature of the inner wall of the pipe (℃)

[0076] T 外 ——Unknown temperature of the outer wall of the pipe (℃)

[0077] r 外 ——The known value of pipe outer diameter (m)

[0078] r 内 ——The known number of pipe inner diameter (m)

[0079] “-” – The negative sign indicates that heat is transferred from high temperature to low temperature;

[0080] Based on (2)

[0081] Q2=h1A(T 液 -T 内 )

[0082] Q2 - Pipeline heat (W) The heat that passes through the liquid to the inner wall of the pipe per unit time and per meter

[0083] A - Convection heat transfer area between the inner surface of the pipe and the fluid.

[0084] h1——heat transfer coefficient (W / mk) The heat transfer coefficient between water and tube surface is taken as 5000

[0085] T 液——Temperature of medium in pipeline (℃): This time, water is considered and the value is 30

[0086] T 内 ——Unknown temperature of the inner wall of the pipe (℃)

[0087] A=2πr 内

[0088] The above can be obtained:

[0089] Q2=h12πr 内 (T 液 -T 内 );

[0090] Based on (3)

[0091] Q3=h2A(T 外 -T 烟 )

[0092] Q3 - Pipeline heat (W) The heat that passes through the outer wall of the pipe to the environment per unit time and per meter

[0093] h2——heat transfer coefficient (W / mk) The heat transfer coefficient between flue gas and tube surface is taken as 100 in this case.

[0094] T 外 ——Pipeline outer wall temperature (℃) unknown

[0095] T 烟 ——Ambient temperature outside the pipe (℃) This time the flue gas value is 350

[0096] The above can be obtained:

[0097] Q3=h22πr 外 (T 外 -T 烟 )

[0098] Due to the uniform heat conduction, the heat conduction at each level is the same, so Q = Q1 = Q2 = Q3

[0099] Available

[0100]

[0101] Q - Pipeline heat (W) is the amount of heat that passes through the pipe to the environment per meter per unit time;

[0102] Based on (4)

[0103] Q=cmΔt

[0104] c——Specific heat of fluid (J / kg℃) The liquid in the tube is considered as water, and 4200 is taken.

[0105] m——fluid mass kg

[0106] Δt——the temperature difference between the inlet and outlet of the fluid after heat exchange (℃) is taken as 15 in this case;

[0107] Based on (4)

[0108] D=4A / S

[0109] D——equivalent diameter of square tube

[0110] A——The effective area of ​​the fluid passing through the square tube

[0111] S - the length of contact between fluid and wall

[0112] In summary, this smoke collection chamber adopts circulating water cooling, with an inlet water pressure of 0.8Mpa and an outlet water pressure of 0.3Mpa. The water-cooled ring beam and box beam are connected in series. The length of the box beam is calculated as 8m, requiring 35.8m3 / h of cooling water, which can effectively prevent the service life of the secondary smoke collection chamber from being affected by "backfire" at the furnace mouth.

[0113] The present invention and its embodiments are described above, and such description is not restrictive. If a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, and designs an embodiment similar to the technical solution without creative design, it shall fall within the scope of protection of the present invention.

Claims

1. A water cooling device for a secondary smoke collecting chamber of a converter, characterized by: The invention comprises an annular water-cooling beam (1), a sealing plate (2) and a water-cooling box beam (3); the sealing plate (2) is adapted to the shape of the annular water-cooling beam (1), and after the annular water-cooling beam (1) is fixed to the bottom of the sealing plate (2), the water-cooling box beam (3) is fixed to the top of the sealing plate (2) near both ends, and the two ends of the annular water-cooling beam (1) are respectively connected to the water-cooling box beam (3) through a water inlet pipe (4) and a water outlet pipe (5).

2. The water cooling device for the secondary smoke collecting chamber of a converter according to claim 1, characterized in that: The annular water-cooled beam (1) comprises a water-cooled beam body (11) and a partition (12); two partitions (12) are evenly arranged in the water-cooled beam body (11) and separate the water-cooled beam body (11); a water inlet (13) is provided on the water-cooled beam body (11) corresponding to one partition (12), and a water outlet (14) is provided on the other partition (12).

3. The water cooling device for the secondary smoke collecting chamber of a converter according to claim 1, characterized in that: The sealing plate (2) comprises a steel plate (21) and a tortoise shell mesh (22); the tortoise shell mesh (22) is arranged to cover the inner surface of the steel plate (21), and a refractory material is sprayed inside the tortoise shell mesh (22).

4. The water cooling device for the secondary smoke collecting chamber of a converter according to claim 1, characterized in that: The water-cooling box beam (3) comprises a cover plate (31), a side plate (32), a cavity sealing plate (33) and a guide plate (34); after a pair of the cover plates (31) and a pair of the side plates (32) form a square tube, the inner cavity is sealed at both ends of the square tube by fixing the cavity sealing plate (33), and a guide plate (34) fixed in the square tube is provided between the two cavity sealing plates (33). A plurality of guide plates (34) are evenly arranged along the axial direction of the square tube, and an overflow gap is left between the guide plates and the upper cover plate, and a water hole is reserved in the middle. A water inlet pipe port (35) is provided on the upper cover plate (31), and a water outlet pipe port (36) is provided on the lower cover plate (31).

5. A method for water cooling a secondary smoke collecting chamber of a converter according to any one of claims 1 to 4, characterized in that: The specific method is as follows: Based on (1) Q1 - Pipeline heat (W) The heat passing through the pipeline per unit time and per meter k——thermal conductivity (W / mk) is determined by the material and is taken as 42 T 内 ——Unknown temperature of the inner wall of the pipe (℃) T 外 ——Unknown temperature of the outer wall of the pipe (℃) r 外 ——The known value of pipe outer diameter (m) r 内 ——The known number of pipe inner diameter (m) "-"——The negative sign indicates that heat is transferred from high temperature to low temperature; Based on (2) Q2=h1A(T 液 -T 内 ) Q2 - Pipeline heat (W) The heat that passes through the liquid to the inner wall of the pipe per unit time and per meter A - Convection heat transfer area between the inner surface of the pipe and the fluid. h1——heat transfer coefficient (W / mk) The heat transfer coefficient between water and tube surface is taken as 5000 T 液 ——Temperature of medium in pipeline (℃): This time, water is considered and the value is 30 T 内 ——Unknown temperature of the inner wall of the pipe (℃) A＝2πr 内 The above can be obtained: Q2=h12r 内 (T 液 -T 内 ); Based on (3) Q3=h2A(T 外 -T 烟 ) Q3 - Pipeline heat (W) The heat that passes through the outer wall of the pipe to the environment per unit time and per meter h2——heat transfer coefficient (W / mk) The heat transfer coefficient between flue gas and tube surface is taken as 100 in this case. T 外 ——Unknown temperature of the outer wall of the pipe (℃) T 烟 ——Ambient temperature outside the pipe (℃) This time the flue gas value is 350 The above can be obtained: Q3=h22πr 外 (T 外 -T 烟 ) Due to the uniform heat conduction, the heat conduction at each level is the same, so Q = Q1 = Q2 = Q3 Available q - Pipeline heat (W) refers to the amount of heat that passes through the pipe to the environment per meter per unit time; Based on (4) Q=Cm△t c——Specific heat of fluid (J / kg℃) The liquid in the tube is considered as water, and 4200 is taken. n——fluid mass kg Δt——the temperature difference between the inlet and outlet of the fluid after heat exchange (℃) is taken as 15 in this case; Based on (4) D=4A / S D——equivalent diameter of square tube A——The effective area of ​​the fluid passing through the square tube S - the length of contact between fluid and wall In summary, this smoke collection chamber adopts circulating water cooling, with a water inlet pressure of 0.8Mpa and a water outlet pressure of 0.3Mpa. The water-cooled ring beam and box beam are connected in series. The length of the box beam is calculated as 8m, requiring 35.8m3 / h of cooling water, which can effectively prevent the service life of the secondary smoke collection chamber from being affected by "backfire" at the furnace mouth.

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