CN113846196B - Furnace raking method based on filling type furnace blowing-out condition - Google Patents
Furnace raking method based on filling type furnace blowing-out condition Download PDFInfo
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- CN113846196B CN113846196B CN202111041153.7A CN202111041153A CN113846196B CN 113846196 B CN113846196 B CN 113846196B CN 202111041153 A CN202111041153 A CN 202111041153A CN 113846196 B CN113846196 B CN 113846196B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/007—Conditions of the cokes or characterised by the cokes used
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
A furnace raking method based on a filling type furnace blowing-out condition comprises the steps of pumping water from a tuyere to push out coke; material is taken off from the tuyere; sealing the granulated slag; introducing nitrogen and cooling; and (4) raking materials in the furnace. Compared with the prior art, the method can reduce the labor consumption, quickly remove the coke stored in the furnace, and shorten 10-20% of the furnace removing time while reducing the cost investment; the drying in the furnace can be ensured without water pumping and temperature reduction in the furnace-raking process, and a good foundation is laid for the subsequent furnace-opening income; the furnace is quickly taken off, the labor intensity of operators is reduced, and the safety of workers is guaranteed.
Description
Technical Field
The invention relates to a blast furnace ironmaking process method, in particular to a furnace raking method based on a filling type furnace blowing-out condition.
Background
The blast furnace blowing out of the iron and steel enterprises adopts empty charge line blowing out and filling type blowing out, and the empty charge line blowing out has the advantages of shorter blowing out time, low working strength in front of the furnace and less furnace pulling workload compared with the filling type blowing out. However, with the continuous improvement of the environmental protection requirement, the stockline can not be lowered to the position of the central line of the tuyere in the blowing-out process, so that the stockline is forced to stop being lowered due to the environmental protection problem, and the slag iron can not be completely discharged, thereby influencing the subsequent blowing-out and raking-out processes; when the stockline descends, air entering the space above the blast furnace is mixed with coal gas to generate detonation, so that the safety of field workers and equipment is damaged. The filling type blowing-out method is high in safety, the coke is used for replacing the load materials, the subsequently blown-out coke can be reused, fuel loss is reduced, the whole blowing-out process is safe and reliable, and the problems that a large amount of manpower and material resources are needed for blowing-out and long time is spent exist in filling type blowing-out.
Disclosure of Invention
Aiming at solving the problems in the prior art, the invention provides a furnace raking method based on a filling type furnace blowing-out condition, which can shorten the furnace raking time and reduce the labor and cost consumption.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a furnace raking method based on a filling type furnace blowing-out condition comprises the following steps:
a. water is pumped from an air port to push out coke: selecting 3-5 air ports as water-fetching ports, sealing other air ports, keeping the temperature in the furnace at 350-450 ℃, and introducing high-pressure water into the furnace from the water-fetching ports, wherein the pressure of the high-pressure water is 800-1000kPa, and the flow rate is 15-30m 3 The high-pressure water is gasified into steam rapidly when meeting the high-temperature coke in the furnace, pressure difference is formed outside the furnace, the coke is pushed out from the air port under the combined action of water flushing and the steam, and the pushed coke is collected and transported by the material conveying device at the water inlet;
b. material taking in an air port: when the water-beating coke at the water-beating opening does not flow outwards, the height of the coke material level in the furnace is reduced to 0.3-0.8 m above the air opening, the air opening is used for scraping the coke in the furnace out of the air opening by adopting an air opening material-scraping device until the coke in the furnace is reduced below the air opening;
c. sealing the water granulated slag: tightly sealing the coke charge level in the furnace by using the granulated slag, wherein the thickness of the granulated slag sealing layer is 0.3-0.45m;
d. introducing nitrogen for cooling: introducing nitrogen into the hearth in the tuyere area and the taphole area to ensure that coke is extinguished and cooled and keep the hearth dry;
e. material raking in the furnace: when the temperature of the hearth is up to 25-45 ℃, a hook machine for scraping materials is put into a manhole of the furnace top, a belt conveyor extends into the manhole from an air port, the hook machine scrapes coke to the belt conveyor, and the belt conveyor conveys the coke out of the hearth from the air port.
According to the method for raking the furnace based on the filling type blowing-out condition, when the coke at the water-pouring opening does not flow out in the step a, the water-pouring opening is switched to the air openings with the interval of 1-2 to be a new water-pouring opening, and the water-pouring coke is continued until the coke does not flow out again.
And c, drilling an iron opening and burying a nitrogen pipeline after the charge level is sealed by the granulated slag in the step c, and welding an air guide pipe at the air opening, wherein the nitrogen pressure is 0.5-0.9MPa.
In the method for raking up the furnace based on the filling type blowing-out condition, the material conveying device in the step a is arranged as follows: a belt conveyor is installed at each water-fetching port on the air port platform, an air port chute is installed at each water-fetching port, the air port chute is located on the upper portion of the starting end of the belt conveyor, a material conveying chute is installed on the lower portion of the tail end of the belt conveyor, coke pushed out from the water-fetching ports is conveyed to the material conveying chute through the belt conveyors through the air port chutes and then conveyed to a field on the lower portion of the furnace platform through the material conveying chute, and loading and conveying are carried out.
In the step b, the tuyere material raking device is a hooking machine with a hammer head part provided with a material raking long groove, the material raking long groove is fixed with the hammer head of the hooking machine, the section of the material raking long groove is an arc groove, the material raking long groove is formed by connecting a plurality of groove bodies along the length of the material raking long groove, and an inclined material shoveling groove is arranged at the end part of the material raking long groove.
According to the method for raking the coke on the basis of the filling type blowing-out condition, the upper part of the conveying chute is provided with the spray pipe, and the spray pipe sprays, cools and removes dust to the coke on the conveying chute.
The furnace-taking method based on the filling type blowing-out condition has the advantages that 2-4 fog gun vehicles are arranged on site for dust suppression in the furnace-taking process.
According to the method for pulling the furnace based on the filling type blowing-out condition, the axial flow fan in the step d blows air into the furnace from the air port, so that the smoothness of a person inlet and outlet channel is ensured.
The method comprises the steps of carrying out the furnace raking process in stages, wherein in the first stage, high-pressure water is introduced into the furnace from a blast furnace tuyere by using the heat of coke, and the coke in the furnace is pushed out from the tuyere by the generated water vapor; in the second stage, when the coke charge level is lowered to a certain height, the tuyere material raking device conveys out the coke raking air outlet in the furnace; when the coke in the furnace is reduced below the air port, nitrogen is introduced for cooling, and then the material in the furnace is raked out, so that the excess material in the furnace is raked out. Compared with the prior art, the method can reduce the labor consumption, quickly remove the coke stored in the furnace, and shorten 10-20% of the furnace removing time while reducing the cost investment; the drying in the furnace can be ensured without pumping water and reducing the temperature in the furnace-raking process, and a good foundation is laid for the subsequent furnace-opening income; the furnace is quickly taken off, the labor intensity of operators is reduced, and the safety of workers is guaranteed.
Drawings
FIG. 1 is a schematic view of a water-fetching port feeding device;
fig. 2 is a schematic view of a raking trough.
The list of labels in the figure is: 1. the device comprises a water injection port, 2, a high-pressure water pipeline, 3, an air port chute, 4, a belt conveyor, 5, a material conveying chute, 6, an air port platform, 7 and a hook machine hammer head; 8. a long raking groove 8-1 and a shoveling groove.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings and embodiments, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The preparation work is carried out before the furnace raking, and comprises the preparation of various furnace raking tools, the cutting of the dust removing cover, the gravity dust removing and diffusing and the field dust suppression control of the fog gun vehicle. Selecting 3-5 air ports as water-beating ports according to the distribution of the air ports of the blast furnace. Referring to fig. 1, a water-fetching mouth material conveying device is installed at a wind gap platform 6 at a water-fetching mouth 1, a set of water-fetching mouth material conveying device is correspondingly arranged at each water-fetching mouth, the water-fetching mouth material conveying device comprises a wind gap chute 3 and a belt conveyor 4, the wind gap chute is positioned at the upper part of the starting end of the belt conveyor, and a material conveying chute 5 is installed at the lower part of the tail end of the belt conveyor. The high-pressure water pipeline 2 is provided with an axial flow fan. After the preparation work is finished, the blast furnace damping down furnace top is ignited, the tuyere small sleeve and the tuyere middle sleeve are removed, and the furnace is taken down.
The furnace raking process is divided into five stages: first, theIn the first stage, high pressure water is pumped into the furnace from the water pumping port, and the coke in the furnace is pushed out from the water pumping port. In the embodiment, three air ports are selected as the water beating ports, the water beating ports are uniformly distributed relative to the blast furnace hearth, and other air ports are closed. High-pressure water is sprayed into the furnace from the high-pressure water pipeline 2, the pressure of the high-pressure water is 900kPa, the pipe diameter is 32mm, and the flow rate is 20m 3 H is the ratio of the total weight of the catalyst to the total weight of the catalyst. The coke temperature in the furnace is about 400 ℃. High-pressure water is gasified into steam rapidly when meeting high-temperature coke in the furnace, the coke is pushed out of the blast furnace from the water-beating opening under the action of pressure difference and the steam to form coke outflow, the coke pushed out from the water-beating opening is conveyed to the material-conveying chute by the belt conveyor through the air opening chute, then conveyed to the field at the lower part of the furnace platform through the material-conveying chute, and loaded and conveyed away, as shown in figure 1. The upper part of the material conveying chute is provided with a spray pipe, and the spray pipe sprays, cools and removes dust to the coke on the material conveying chute. When the coke at the water-beating opening does not flow outwards, the water-beating opening is switched, 3 new water-beating openings are reestablished at two air openings at the position interval of each original water-beating opening, other air openings are sealed, the water-beating opening material conveying devices are arranged at the 3 new water-beating openings respectively, and water is continuously beaten into the furnace at the new water-beating openings until the coke does not flow outwards again.
When the height of the coke charge level in the furnace is reduced to 0.3-0.8 m above the tuyere, the second stage of furnace raking is carried out: and (5) material raking at the tuyere. When the charge level in the furnace is lowered to 0.5 m above the tuyere in the embodiment, the tuyere which is not watered is raked by the tuyere raking device. The tuyere material raking device is a hooking machine with a long material raking groove assembled on the hammer head part. Referring to fig. 2, a raking trough 8 is fixed with a hammer head 7 of the hook machine, the section of the raking trough is in the shape of an arc trough, the raking trough is formed by connecting a plurality of trough bodies along the length of the raking trough, and the trough bodies can be assembled according to needs. The end part of the raking elongated slot is provided with an inclined shoveling groove. The coke taken out in the second stage is directly unloaded to a hopper at the platform through an air port material taking device and then is transported away by a crown block.
And performing a water granulated slag sealing stage after the coke charge level in the furnace is lower than the tuyere. And (3) completely and tightly sealing the coke charge level in the furnace by using the granulated slag, wherein the thickness of the granulated slag sealing layer is 0.3-0.45m.
And (3) after the granulated slag is sealed, nitrogen is introduced for cooling: and drilling an iron notch, embedding a nitrogen pipeline, and introducing nitrogen into the hearth in the tuyere area and the iron notch area to ensure that coke is extinguished and cooled and keep the hearth dry. The nitrogen pressure in this example was 0.6MPa. And (4) when the coke is extinguished and cooled and the temperature in the furnace is reduced to 30-45 ℃, preparing to carry out the material raking in the furnace and stopping blowing nitrogen.
And (3) in the furnace material raking stage, putting a hook machine for raking materials into a manhole of the furnace top, extending the hook machine into the belt conveyor from the air port, operating the hook machine by an operator to rake the coke to the belt conveyor, and conveying the residual coke out of the furnace hearth from the air port by the belt conveyor.
Claims (6)
1. A furnace raking method based on a filling type furnace blowing-out condition is characterized by comprising the following steps: the method comprises the following steps:
a. water is pumped from an air port to push out coke: selecting 3-5 air ports as water pumping ports, sealing other air ports, leading high-pressure water into the furnace from the water pumping ports at the temperature of 350-450 ℃, leading the high-pressure water into the furnace from the water pumping ports, wherein the pressure of the high-pressure water is 800-1000kPa, the flow is 15-30 m/h, the high-pressure water is gasified into steam when meeting high-temperature coke in the furnace, forming pressure difference outside the furnace, pushing the coke out of the air ports under the combined action of water flushing and steam, and collecting and transferring the pushed coke by a material conveying device of the water pumping ports;
b. material taking in an air port: when the water-beating coke at the water-beating opening does not flow outwards, the height of the coke level in the furnace is reduced to 0.3-0.8 m above the air port, the air port is used for pushing the coke in the furnace out of the air port by adopting an air port material pushing device, and the coke in the furnace is reduced to be below the air port;
c. sealing the water granulated slag: tightly sealing the coke charge level in the furnace by using the grain slag, wherein the thickness of the grain slag sealing layer is 0.3-0.45m;
d. introducing nitrogen for cooling: introducing nitrogen into the hearth in the tuyere area and the taphole area to ensure that coke is extinguished and cooled and keep the hearth dry;
e. material raking in the furnace: when the temperature of the hearth is 25-45 ℃, putting a hook machine for scraping materials into a manhole of the furnace top, stretching the hook machine into the belt conveyor from an air port, scraping coke to the belt conveyor by the hook machine, and conveying the coke out of the hearth from the air port by the belt conveyor;
the material conveying device in the step a is arranged as follows: a belt conveyor is arranged at each water-fetching port on the air port platform, an air port chute is arranged at the water-fetching port, the air port chute is positioned at the upper part of the starting end of the belt conveyor, a material conveying chute is arranged at the lower part of the tail end of the belt conveyor, coke pushed out from the water-fetching port is conveyed to the material conveying chute by the belt conveyor through the air port chute, then conveyed to the lower field of the furnace platform through the material conveying chute, and loaded and conveyed away;
and c, when the coke at the water-pouring opening does not flow out in the step a, switching to an air opening with an interval of 1-2 to be a new water-pouring opening, and continuously pouring water to flush the coke until the coke does not flow out again.
2. The furnace raking method based on the filling type furnace blowing-out condition as claimed in claim 1, wherein the furnace raking method comprises the following steps: and c, after the material surface is sealed by the water slag in the step c, drilling an iron opening and burying a nitrogen pipeline, welding an air guide pipe at the air opening, and controlling the nitrogen pressure to be 0.5-0.9MPa.
3. The furnace raking method based on the filling type blowing-out condition as claimed in claim 2, wherein: and c, in the step b, the air port raking device is a hooking machine with a raking long groove assembled on the hammer head part, the raking long groove is fixed with the hammer head of the hooking machine, the section of the raking long groove is an arc groove, the raking long groove is formed by connecting a plurality of groove bodies along the length of the raking long groove, and an inclined shoveling groove is formed in the end part of the raking long groove.
4. The furnace raking method based on the filling type blowing-out condition is characterized in that: the upper part of the material conveying chute is provided with a spray pipe, and the spray pipe sprays, cools and removes dust to the coke on the material conveying chute.
5. The furnace raking method based on the filling type blowing-out condition is characterized in that: and in the furnace removing process, 2-4 fog gun vehicles are equipped on site to suppress dust.
6. The furnace raking method based on the filling type blowing-out condition is characterized in that: and d, blowing air into the furnace from the air port by the axial flow fan in the step d, and ensuring smooth passing of personnel in and out.
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| CN202111041153.7A CN113846196B (en) | 2021-09-06 | 2021-09-06 | Furnace raking method based on filling type furnace blowing-out condition |
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| CN202111041153.7A CN113846196B (en) | 2021-09-06 | 2021-09-06 | Furnace raking method based on filling type furnace blowing-out condition |
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| CN113846196B true CN113846196B (en) | 2023-03-17 |
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