CN115044723A - Blast furnace baking device and blast furnace baking process - Google Patents
Blast furnace baking device and blast furnace baking process Download PDFInfo
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- CN115044723A CN115044723A CN202210443976.0A CN202210443976A CN115044723A CN 115044723 A CN115044723 A CN 115044723A CN 202210443976 A CN202210443976 A CN 202210443976A CN 115044723 A CN115044723 A CN 115044723A
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- 238000000034 method Methods 0.000 title claims description 21
- 238000001035 drying Methods 0.000 claims abstract description 65
- 239000010865 sewage Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 230000001965 increasing effect Effects 0.000 claims description 17
- 230000007423 decrease Effects 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 4
- 230000001939 inductive effect Effects 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims 1
- 238000007599 discharging Methods 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 230000000740 bleeding effect Effects 0.000 description 4
- 239000011449 brick Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000000643 oven drying Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/002—Evacuating and treating of exhaust gases
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/04—Blast furnaces with special refractories
- C21B7/06—Linings for furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/16—Tuyéres
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- Engineering & Computer Science (AREA)
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- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention belongs to the technical field of blast furnace drying, and discloses a blast furnace drying device and a blast furnace drying process, wherein the blast furnace drying device comprises a plurality of drying guide pipes, a cover plate, a plurality of thermocouples and a plurality of sewage discharge pipelines; the furnace drying guide pipe comprises a first guide pipe and a second guide pipe which are vertically connected, one end of the first guide pipe is communicated with the tuyere, the other end of the first guide pipe extends along the radial direction of the furnace hearth, and the second guide pipe is arranged in the furnace hearth and extends along the axial direction of the furnace hearth; the cover plate is arranged in the hearth and is covered above the first guide pipe; the thermocouple is arranged in the air inlet, and the detection end is arranged in the hearth; the blow-off pipes are arranged between the hearth and the furnace bottom and used for discharging water vapor, and the blow-off pipes are uniformly arranged along the circumference of the hearth at intervals. The blast furnace drying device can effectively dry the blast furnace and discharge water vapor of the blast furnace in time, is easy to observe the water vapor amount and has high operation efficiency; the blast furnace drying process uses the blast furnace drying device to realize the whole drying of the blast furnace, avoids damaging the furnace top valve and the device, and has high furnace drying efficiency.
Description
Technical Field
The invention relates to the technical field of blast furnace drying, in particular to a blast furnace drying device and a blast furnace drying process.
Background
Before the newly-built blast furnace is put into production, areas such as a hearth, a furnace bottom, a furnace wall and the like need to be dried, and the aim is to dry moisture carried in the masonry process so as to ensure the safety of furnace opening and the service life of the blast furnace. If the moisture in the hearth and the hearth area is not dried, after the furnace is opened for a period of time, moisture evaporation can cause air gap channels to appear between the packing layers in the long-term high-temperature environment of the hearth area, the air gap treatment labor intensity is increased, the safety risk of the hearth can be increased, and the service life of the hearth is influenced.
Under the condition of the prior art, the baking furnaces are all provided with a baking furnace guide pipe and enter from a tuyere, hot air is introduced into the bottom of a furnace hearth for sweeping and then is diffused and discharged from the top of a blast furnace, and moisture carried in the building process of the furnace hearth and the furnace bottom area is evaporated by utilizing the temperature of the hot air. The installation method of the drying furnace guide pipe is different, the operation of the drying furnace process is different, each blast furnace can automatically determine how to set the drying furnace guide pipe according to the experience of constructors, the drying furnace process flow is controlled according to the experience, and no unified standard exists; because the furnace top is provided with a large number of hydraulic, pneumatic and electric valves and devices, the furnace top equipment is easy to damage due to the overhigh temperature of the baking furnace, and the moisture of the baking furnace cannot be effectively dried due to the overlow temperature of the baking furnace. The moisture between the carbon brick filler layers in the dry hearth area of the baking furnace is not used for baking the furnace, so that carbon and water react in the carbon brick after the furnace is opened, the structural integrity of the carbon brick is damaged, the subsequent safety and long service life of the blast furnace are influenced, the operation efficiency is low, and the baking operation of a newly-built blast furnace can be generally completed within more than two weeks.
Moreover, because the number of the blow-off holes arranged in the area below the tuyere of the blast furnace hearth is small, water vapor in the furnace drying process cannot be discharged in time, and the water vapor amount in the blow-off holes cannot be accurately observed.
Therefore, a blast furnace drying device and a blast furnace drying process are needed to solve the above problems.
Disclosure of Invention
One object of the present invention is to provide a blast furnace drying apparatus which can effectively dry a blast furnace and discharge moisture of the furnace in time, and which is easy to observe the amount of moisture and has high operation efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
provided is a blast furnace baking device, including:
the furnace drying device comprises a plurality of furnace drying guide pipes, a plurality of furnace drying guide pipes and a plurality of heat exchange pipes, wherein the furnace drying guide pipes comprise a first guide pipe and a second guide pipe which are vertically connected, one end of the first guide pipe is communicated with a tuyere, the other end of the first guide pipe extends along the radial direction of a furnace hearth, and the second guide pipe is arranged in the furnace hearth and extends along the axial direction of the furnace hearth;
the cover plate is arranged in the hearth and is covered above the first guide pipe;
the thermocouples are arranged in the air inlet, and the detection ends of the thermocouples are arranged in the hearth; and
a plurality of sewage pipes, sewage pipe sets up between hearth and the stove bottom, sewage pipe is configured to discharge steam, and is a plurality of sewage pipe follows the circumference interval of hearth evenly sets up.
As a preferable structure of the invention, the length of the first guide pipe of the plurality of oven guide pipes is gradually reduced in a step manner, and the distance between the tail end of the second guide pipe and the bottom of the furnace hearth is 600mm-800 mm.
As a preferred structure of the present invention, the blast furnace drying device further includes a plurality of first fixing frames and a plurality of second fixing frames, two ends of the first fixing frames are respectively and fixedly connected to two adjacent first guide pipes, and two ends of the second fixing frames are respectively and fixedly connected to the second guide pipes and the furnace wall.
As a preferable structure of the present invention, the blast furnace drying device further includes a plurality of blow-down valves, and the blow-down valves are respectively disposed in the blow-down pipes.
The invention also aims to provide a blast furnace drying process, which can realize the whole drying of the blast furnace, avoid damaging a hydraulic, pneumatic and electric valve and a device on the top of the blast furnace and has high furnace drying efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
the blast furnace drying process using the blast furnace drying device comprises the following steps:
in the temperature rising stage, a blast furnace fan is started, a furnace drying guide pipe introduces hot air in a blast furnace hot air furnace, and the temperature of the furnace drying is controlled to be gradually increased to 560 ℃;
in the constant temperature stage, the temperature of the drying furnace is kept to be 560 ℃ within a first set time, and the moisture conditions of different positions of the blast furnace are detected;
and in the temperature reduction stage, controlling the temperature of the oven to be gradually reduced to be below 80 ℃, and stopping the oven drying.
As a preferred embodiment of the present invention, the temperature raising stage specifically includes the following steps:
step S11, starting the blast furnace fan, opening the blast furnace air mixing valve to 800m 3 The air quantity of the air/min is induced into the blast furnace and 200m is used for the air 3 Inducing air into the blast furnace hot blast stove by the air quantity of/min;
step S12, gradually reducing the blast furnace air mixing valve, simultaneously increasing the hot blast valve of the blast furnace hot blast stove, increasing the air quantity of the blast furnace hot blast stove to adjust the temperature of the mixed air until the temperature of the drying furnace reaches 120 ℃, and maintaining for 1 hour;
step S13, controlling the temperature of the oven to be gradually increased to 155 ℃, and maintaining the temperature for 1 hour;
step S14, controlling the temperature of the baking oven to be gradually increased to 400 ℃ by the wind temperature increment of 4 ℃/hour, and maintaining the temperature for 26 hours;
and step S15, controlling the temperature of the baking furnace to be gradually increased to 560 ℃ by wind temperature increment of 6 ℃/hour.
As a preferred embodiment of the present invention, the cooling stage specifically includes the following steps:
step S21, controlling the temperature of the oven to gradually decrease to 200 ℃ by wind temperature increment of 12 ℃/hour, and maintaining for 30 hours;
step S22, controlling the temperature of the oven to gradually decrease to 80 ℃ by wind temperature increment of 10 ℃/hour;
and step S23, stopping baking the furnace when the baking temperature is lower than 80 ℃.
As a preferred embodiment of the present invention, before the temperature raising stage, the method further comprises the following steps:
and in the preparation stage, the blast furnace hot blast stove is burnt until the vault temperature of the blast furnace hot blast stove reaches over 1200 ℃.
As a preferred embodiment of the present invention, in the constant temperature stage, the first set time is 110 hours.
As a preferred embodiment of the present invention, the opening or closing of the soil discharge valve in the soil discharge pipe is determined according to the oven temperature.
The invention has the beneficial effects that:
according to the blast furnace drying device provided by the invention, the first guide pipe and the second guide pipe which are vertically connected can introduce hot air into the furnace hearth to effectively dry the furnace; the cover plate can avoid the vibration of the drying furnace guide pipe and gather the heat of the drying furnace, thereby improving the drying furnace efficiency and avoiding the high temperature from damaging a large amount of hydraulic, pneumatic and electric valves and devices on the furnace top; the plurality of sewage pipes are arranged between the furnace hearth and the furnace bottom, so that water vapor in the furnace drying process can be quickly discharged, the water vapor amount is easy to observe, and the operation efficiency is high;
according to the blast furnace drying process provided by the invention, the drying process is divided into a heating stage, a constant temperature stage and a cooling stage, the heating and cooling processes are mild, water vapor is easily discharged through a sewage discharge pipeline, the whole drying of the blast furnace can be realized, the hydraulic, pneumatic and electric valves and devices on the furnace top are not damaged, and the operation efficiency is high.
Drawings
Fig. 1 is a schematic structural diagram of a blast furnace baking device according to an embodiment of the present invention.
In the figure:
1. a furnace-drying duct; 11. a first conduit; 12. a second conduit; 2. a cover plate; 3. a blowdown pipeline; 4. a second fixing frame;
100. a tuyere; 200. a hearth; 300. a furnace bottom; 400. a blast furnace.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings, not all of them.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Example one
As shown in fig. 1, an embodiment of the present invention provides a blast furnace drying device, which includes a plurality of drying duct 1, a cover plate 2, a plurality of thermocouples, and a plurality of sewage pipes 3. The furnace baking guide pipe 1 comprises a first guide pipe 11 and a second guide pipe 12 which are vertically connected, one end of the first guide pipe 11 is communicated with the tuyere 100, the other end of the first guide pipe extends along the radial direction of the furnace hearth 200, the second guide pipe 12 is arranged inside the furnace hearth 200 and extends along the axial direction of the furnace hearth 200, the diameter of the first guide pipe 11 is 20mm smaller than the diameter of a small sleeve of the tuyere 100, and the installation is easy. The first and second guide pipes 11 and 12, which are vertically connected, enable hot air to be introduced into the interior of the hearth 200 for efficient oven drying. The cover plate 2 is arranged in the hearth 200, and the cover plate 2 is covered above the first guide pipe 11. The cover plate 2 is made of steel materials with the thickness of 8mm, the diameter ratio of the cover plate to the hearth is less than 200 inner diameters by 1000mm, the cover plate 2 can avoid vibration of the drying furnace guide pipe 1, heat of the drying furnace can be gathered, drying furnace efficiency is improved, and a large amount of hydraulic, pneumatic and electric valves and devices on the furnace top are prevented from being damaged by high temperature. Many thermocouples (not shown in the figure) are installed in the tuyere 100, the detection ends of many thermocouples are arranged in the interior of the hearth 200, in this embodiment, four thermocouples are installed in the blast furnace baking device, the hot end of one thermocouple is arranged at 2000mm above the cover plate 2, the hot end of one thermocouple is arranged on the surface of the central clay brick at the bottom of the hearth 200, the other two thermocouples are arranged at 300mm inside the tuyere 100 small sleeve extending into the hearth 200, and the four positions are surrounded around many baking furnace pipes 1, so that the baking temperature can be accurately measured. The blow-off pipe 3 is opened between the hearth 200 and the bottom 300, the blow-off pipe 3 is configured to discharge water vapor, and the plurality of blow-off pipes 3 are arranged at regular intervals along the circumference of the hearth 200. Preferably, a plurality of sewage pipes 3 are arranged at the position of the furnace skin along the circumference of the furnace cylinder 200 at intervals of 45 degrees, the diameter of the sewage pipes 3 is 20mm, water vapor in the furnace baking process can be quickly discharged, and the observation is easy.
Preferably, the length of the first conduit 11 of the plurality of oven conduits 1 decreases in steps, and the distance between the end of the second conduit 12 and the bottom of the oven hearth 200 is 600mm-800 mm. In the embodiment of the present invention, the first guide pipes 11 are divided into four dimensions, the longest first guide pipe 11 is 200mm smaller than the radius of the hearth 200, that is, the longest first guide pipe 11 extends to the vicinity of the center of the hearth 200 in the radial direction of the hearth 200, and the lengths of the remaining three first guide pipes 11 are 1000mm smaller, 2000mm smaller and 3000mm smaller than the diameter of the hearth 200, respectively. The first guide pipes 11 of four sizes are sequentially arranged along the circumferential direction of the hearth 200, so that the introduction of the hot air of the oven is uniform. The distance between the tail end of the second guide pipe 12 and the bottom of the furnace hearth 200 is 600mm-800mm, so that the furnace can be effectively dried at the bottom of the furnace hearth 200, and the bottom of the furnace hearth 200 can be prevented from being damaged by overhigh temperature.
Preferably, the blast furnace drying device further comprises a plurality of first fixing frames (not shown in the figure) and a plurality of second fixing frames 4, two ends of each first fixing frame are respectively and fixedly connected with two adjacent first guide pipes 11, and two ends of each second fixing frame 4 are respectively and fixedly connected with a second guide pipe 12 and the furnace wall. The first and second holders 4 prevent the oven duct 1 from vibrating to an excessive extent during the oven.
As preferred scheme, blast furnace baker device still includes a plurality of blowoff valves, and a plurality of blowoff valves set up respectively in sewage pipes 3. The drainage of water vapor can be controlled through the drain valve, and the oven drying process can be adjusted according to the working condition, so that the efficiency is higher.
Example two
The second embodiment of the invention provides a blast furnace baking process, which uses the blast furnace baking device in the first embodiment, and specifically comprises the following steps:
in the temperature rising stage, a blast furnace fan is started, a furnace drying guide pipe 1 introduces hot air in a blast furnace hot air furnace, and the temperature of the furnace drying is controlled to be gradually increased to 560 ℃;
in the constant temperature stage, the temperature of the drying furnace is kept at 560 ℃ within a first set time, and the moisture conditions of different positions of the blast furnace 400 are detected; preferably, in the constant temperature stage, the first set time is 110 hours.
And in the temperature reduction stage, controlling the temperature of the oven to be gradually reduced to be below 80 ℃, and stopping the oven drying.
According to the blast furnace drying process disclosed by the embodiment of the invention, the drying process is divided into a heating stage, a constant temperature stage and a cooling stage, the heating and cooling processes are mild, water vapor is easily discharged through the sewage discharge pipeline 3, all the blast furnace 400 can be dried, hydraulic, pneumatic and electric valves and devices on the furnace top are not damaged, and the operation efficiency is high. It should be noted that, in the process of baking the furnace, the pressure in the blast furnace 400 is adjusted by opening and closing the bleeding valves at the top of the furnace, so that the pressure is controlled to be 12kpa-15kpa, usually, 3-4 bleeding valves are arranged at the top of the blast furnace 400, at least one bleeding valve must be kept in a normally open state during baking the furnace, and the pressure in the furnace is adjusted by adjusting the opening and closing states and the opening and closing sizes of the remaining bleeding valves, so as to ensure the normal operation of the baking furnace.
As a preferable scheme, the temperature raising stage specifically comprises the following steps:
step S11, starting a blast furnace fan, opening a blast furnace air mixing valve to 800m 3 The air quantity of each minute is 200m for introducing air into the blast furnace 400 3 Inducing air into the blast furnace hot blast stove by the air quantity of/min;
step S12, gradually reducing the blast furnace air mixing valve, simultaneously increasing the hot blast valve of the blast furnace hot blast stove, increasing the air quantity of the blast furnace hot blast stove to adjust the temperature of the mixed air until the temperature of the baking furnace reaches 120 ℃, and maintaining for 1 hour;
step S13, controlling the temperature of the oven to be gradually increased to 155 ℃, and maintaining the temperature for 1 hour;
step S14, controlling the temperature of the oven to gradually increase to 400 ℃ by the wind temperature increment of 4 ℃/hour, and maintaining the temperature for 26 hours;
and step S15, controlling the temperature of the oven to gradually increase to 560 ℃ by wind temperature increment of 6 ℃/hour.
It should be noted that, in the above temperature raising stage, attention needs to be paid to the temperature of the top gas of the blast furnace 400, and when the gas temperature exceeds 380 ℃, the air volume needs to be reduced or a small amount of nitrogen needs to be introduced into the top of the blast furnace to reduce the temperature of the top gas and prevent the equipment from being damaged.
As a preferred scheme, the cooling stage specifically comprises the following steps:
step S21, controlling the temperature of the oven to gradually decrease to 200 ℃ by the wind temperature increment of 12 ℃/hour, and maintaining the temperature for 30 hours;
step S22, controlling the temperature of the oven to gradually decrease to 80 ℃ by the wind temperature increment of 10 ℃/hour;
and step S23, stopping baking the furnace when the baking temperature is lower than 80 ℃.
Preferably, before the temperature raising stage, the blast furnace baking process further comprises the following steps:
in the preparation stage, the blast furnace hot blast stove burns until the temperature of the vault of the blast furnace hot blast stove reaches over 1200 ℃, and hot air with enough temperature can be provided for the blast furnace 400.
Preferably, the opening or closing of the blow-down valve in the blow-down pipe 3 is determined according to the temperature of the oven, so that the moisture can be discharged more efficiently. For example, in the temperature rising stage, when the temperature of the oven is within 150 ℃, the drain valve in the drain pipeline 3 between the oven hearth 200 and the oven bottom 300 is completely closed; when the temperature of the oven is 150-300 ℃, the blow-down valve is completely opened; when the temperature of the oven is constant at 300 ℃, the blow-down valves are alternately opened or closed, namely one blow-down valve is opened and the other blow-down valve is closed, and the on-off state is changed after a period of time; when the temperature of the oven is 300-560 ℃, each blow-down valve is opened for 2-4 hours independently, then the adjacent blow-down valves are opened for 2-4 hours, and the steps are alternated in sequence until all blow-down valves are opened at least once, and the temperature condition in the blow-down pipeline 3 is detected. In the cooling stage, all normally working and airtight blow-down valves are opened until the temperature of the oven is reduced to 150 ℃, and all blow-down valves are closed.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A blast furnace drying device is characterized by comprising:
the furnace drying device comprises a plurality of furnace drying guide pipes (1), wherein each furnace drying guide pipe (1) comprises a first guide pipe (11) and a second guide pipe (12) which are vertically connected, one end of each first guide pipe (11) is communicated with a tuyere (100), the other end of each first guide pipe extends along the radial direction of a furnace hearth (200), and each second guide pipe (12) is arranged inside the furnace hearth (200) and extends along the axial direction of the furnace hearth (200);
the cover plate (2) is arranged in the hearth (200), and the cover plate (2) is covered above the first guide pipe (11);
the thermocouples are arranged in the tuyere (100), and the detection ends of the thermocouples are arranged in the hearth (200); and
a plurality of sewage pipes (3), sewage pipes (3) set up in between furnace hearth (200) and stove bottom (300), sewage pipes (3) are configured into discharge steam, and are a plurality of sewage pipes (3) are followed the circumference interval of furnace hearth (200) evenly sets up.
2. The blast furnace installation according to claim 1, wherein said first duct (11) of said plurality of said furnace ducts (1) has a length decreasing in steps, and the distance between the end of said second duct (12) and the bottom of said hearth (200) is 600mm-800 mm.
3. The blast furnace drying device according to claim 1, further comprising a plurality of first fixing frames and a plurality of second fixing frames (4), wherein two ends of the first fixing frames are respectively fixedly connected with two adjacent first guide pipes (11), and two ends of the second fixing frames (4) are respectively fixedly connected with the second guide pipes (12) and the furnace wall.
4. The blast furnace installation according to claim 1, further comprising a plurality of blow-down valves respectively provided in said blow-down pipes (3).
5. A blast furnace baking process, characterized in that the blast furnace baking device according to any one of claims 1 to 4 is used, and comprises the following steps:
in the temperature rising stage, a blast furnace fan is started, hot air in a blast furnace hot air furnace is introduced into a furnace drying guide pipe (1), and the temperature of the furnace drying is controlled to be gradually increased to 560 ℃;
in the constant temperature stage, the temperature of the furnace is kept to be 560 ℃ within a first set time, and the water containing conditions of different positions of the blast furnace (400) are detected;
and in the temperature reduction stage, controlling the temperature of the oven to be gradually reduced to be below 80 ℃, and stopping the oven.
6. The blast furnace baking process according to claim 5, wherein the temperature raising stage comprises the following steps:
step S11, starting the blast furnace fan, opening the blast furnace air mixing valve to 800m 3 The air quantity of/min is introduced into the blast furnace (400) and 200m is used at the same time 3 Inducing air into the blast furnace hot blast stove by the air quantity of/min;
step S12, gradually reducing the blast furnace air mixing valve, simultaneously increasing the hot blast valve of the blast furnace hot blast stove, increasing the air quantity of the blast furnace hot blast stove to adjust the temperature of the mixed air until the temperature of the drying furnace reaches 120 ℃, and maintaining for 1 hour;
step S13, controlling the temperature of the oven to be gradually increased to 155 ℃, and maintaining the temperature for 1 hour;
step S14, controlling the temperature of the oven to gradually increase to 400 ℃ by wind temperature increment of 4 ℃/hour, and maintaining for 26 hours;
and step S15, controlling the temperature of the oven to be gradually increased to 560 ℃ by wind temperature increment of 6 ℃/hour.
7. The blast furnace baking process according to claim 5, wherein the temperature reduction stage specifically comprises the steps of:
step S21, controlling the temperature of the oven to gradually decrease to 200 ℃ by wind temperature increment of 12 ℃/hour, and maintaining for 30 hours;
step S22, controlling the temperature of the oven to gradually decrease to 80 ℃ by wind temperature increment of 10 ℃/hour;
and step S23, stopping baking the furnace when the baking temperature is lower than 80 ℃.
8. The blast furnace baking process of claim 5, further comprising, prior to the temperature raising stage, the steps of:
and in the preparation stage, the blast furnace hot blast stove is burnt until the vault temperature of the blast furnace hot blast stove reaches over 1200 ℃.
9. The blast furnace process of claim 5, wherein the first set time is 110 hours in the constant temperature stage.
10. The blast furnace baking process according to claim 5, wherein the opening or closing of the blow-down valve in the blow-down pipe (3) is determined according to the baking temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210443976.0A CN115044723A (en) | 2022-04-25 | 2022-04-25 | Blast furnace baking device and blast furnace baking process |
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| CN202210443976.0A CN115044723A (en) | 2022-04-25 | 2022-04-25 | Blast furnace baking device and blast furnace baking process |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR773369A (en) * | 1934-03-10 | 1934-11-16 | Metallgesellschaft Ag | Method and device for roasting ores in rotary tube furnaces |
| CN202643724U (en) * | 2012-07-05 | 2013-01-02 | 南京钢铁股份有限公司 | Blast furnace oven baking tuyere air guide tube device |
| CN207811780U (en) * | 2017-11-27 | 2018-09-04 | 攀钢集团西昌钢钒有限公司 | A kind of blast furnace crucibe apparatus for baking |
| CN112981026A (en) * | 2021-02-23 | 2021-06-18 | 山西太钢不锈钢股份有限公司 | Arrangement method of blast furnace drying hot air guide pipe |
-
2022
- 2022-04-25 CN CN202210443976.0A patent/CN115044723A/en active Pending
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|---|---|---|---|---|
| FR773369A (en) * | 1934-03-10 | 1934-11-16 | Metallgesellschaft Ag | Method and device for roasting ores in rotary tube furnaces |
| CN202643724U (en) * | 2012-07-05 | 2013-01-02 | 南京钢铁股份有限公司 | Blast furnace oven baking tuyere air guide tube device |
| CN207811780U (en) * | 2017-11-27 | 2018-09-04 | 攀钢集团西昌钢钒有限公司 | A kind of blast furnace crucibe apparatus for baking |
| CN112981026A (en) * | 2021-02-23 | 2021-06-18 | 山西太钢不锈钢股份有限公司 | Arrangement method of blast furnace drying hot air guide pipe |
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Application publication date: 20220913 |