CN113122665A - Method for treating dead iron layer of hearth after blast furnace shutdown - Google Patents
Method for treating dead iron layer of hearth after blast furnace shutdown Download PDFInfo
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- CN113122665A CN113122665A CN202110410980.2A CN202110410980A CN113122665A CN 113122665 A CN113122665 A CN 113122665A CN 202110410980 A CN202110410980 A CN 202110410980A CN 113122665 A CN113122665 A CN 113122665A
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- hearth
- iron layer
- furnace
- dead iron
- dead
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D25/00—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag
- F27D25/001—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag comprising breaking tools, e.g. hammers, drills, scrapers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D25/00—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag
- F27D25/006—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag using explosives
Abstract
The invention discloses a method for treating a hearth dead iron layer after blast furnace shutdown, which provides a static blasting expanding agent and comprises the following steps: step S10, cooling the furnace, enabling the temperature of the surface of the dead iron layer to be T1, and cutting a furnace shell in a pore channel area of the dead iron layer discharged from the furnace hearth during furnace shutdown to obtain a furnace shell cutting opening; step S20, marking an identification line in the peripheral area of the dead iron layer surface of the hearth containing the coke to obtain an identification area; and S30, determining a drilling point in the marked area, drilling along the thickness direction of the dead iron layer of the hearth on the drilling point to obtain a containing hole, introducing a static blasting expanding agent into the containing hole, plugging the hole opening of the containing hole, cracking the dead iron layer of the hearth at intervals of a first time period, and then removing the cracked dead iron layer of the hearth from the cutting opening of the furnace shell to the outside of the hearth. The operation is simple, the safety is good, the working labor is small, the efficiency is high, and the cost is low.
Description
Technical Field
The invention relates to the technical field of blast furnaces, in particular to a method for treating a hearth dead iron layer after the blast furnace is stopped.
Background
The furnace shutdown is a process for finishing production of the blast furnace, and after the furnace shutdown, a furnace hearth discharges residual iron from the interior of the furnace hearth through a residual iron discharging process. However, the slag iron on the dead iron layer at the bottom of the hearth cannot be effectively discharged, and in order to realize the maintenance operation of the blast furnace hearth, the residual slag iron on the dead iron layer of the hearth needs to be cleaned, so that conditions are created for the subsequent integral casting or building of carbon bricks of the hearth.
Among the prior art, the inside dead iron layer of clearance furnace hearth can adopt the explosive to explode the inside dead iron layer of pine furnace hearth earlier, then adopts the manual work and colludes the machine etc. and combine the clearance again, and this kind of mode exists following not enoughly: 1. cleaning personnel work in the semi-closed hearth, and because dust in the hearth cannot be effectively diffused, the air quality is poor, and the harm to the body of the cleaning personnel is large; 2. the explosive blasting effect is not ideal because the residue in the dead iron layer is formed by mixing coke, slag and solidified molten iron, the dead iron layer needs to be blasted in a large area for many times during specific operation, the operation difficulty is high, and the operation efficiency is low; 3. in the blasting process, a large number of cooling pipes on a blast furnace are usually loosened and broken due to the influence of the huge energy of the explosive, so that the subsequent repairing workload and the repairing cost are increased; 4. in the process of blasting, the noise that the explosion produced is great to transportation, storage and the detonation etc. of explosive all belong to and have huge potential safety hazard, and the management degree of difficulty is great, need organize regional personnel to evacuate outside hundred meters when blasting, require great to the space.
Disclosure of Invention
One object of the present invention is: provided is a method for treating a dead iron layer in a hearth after a blast furnace is shut down, which is easy to operate and has excellent safety.
Another object of the invention is: provided is a method for treating a dead iron layer in a hearth after a blast furnace is shut down, which is low in labor amount, high in efficiency and low in cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
providing a static blasting expanding agent, and providing the static blasting expanding agent, wherein the method comprises the following steps:
step S10, cooling the furnace, enabling the temperature of the surface of the dead iron layer to be T1, and cutting a furnace shell in a pore channel area of the dead iron layer discharged from the furnace hearth during furnace shutdown to obtain a furnace shell cutting opening;
step S20, marking identification lines in the areas, containing coke, on the surface of the dead iron layer of the hearth to obtain identification areas;
step S30, determining a drilling point in the marked area, drilling along the thickness direction of the dead iron layer of the furnace hearth on the drilling point to obtain an accommodating hole, introducing the static blasting expanding agent into the accommodating hole, plugging the hole opening of the accommodating hole, cracking the dead iron layer of the furnace hearth at intervals of a first time period, and then clearing the cracked dead iron layer of the furnace hearth from the furnace shell cutting opening to the outside of the furnace hearth.
As a preferable technical scheme of the method for treating the hearth dead iron layer after the blast furnace is stopped, T1 is the surface temperature of the hearth dead iron layer when the hearth dead iron layer is cooled, and T1 is more than or equal to 40 ℃.
As a preferable technical scheme of the method for treating the dead iron layer of the hearth after the blast furnace is stopped, the furnace shell is cut along an area L1 away from the upper part of the dead iron layer of the hearth and an area L2 away from the lower part of the dead iron layer of the hearth, so that a pore channel for discharging the dead iron layer of the hearth when the furnace is stopped is completely covered by the cutting opening of the furnace shell, L1 is not less than 400mm and not more than 700mm, and L2 is not less than 200 mm.
As a preferable technical scheme of the method for treating the dead iron layer of the hearth after the blast furnace is shut down, the furnace shell cutting openings are formed in an arc shape along the surrounding direction of the hearth.
The method for processing the hearth dead iron layer after the blast furnace is stopped preferably includes the steps of estimating the weight of the hearth dead iron layer in each identification area before the identification areas are obtained, and enabling the weight of the hearth dead iron layer in each identification area to be 5-10 t.
As a preferable technical scheme of the method for treating the dead iron layer of the furnace hearth after the blast furnace is stopped, the distance between two adjacent accommodating holes is 200-300 mm.
As a preferable technical scheme of the method for treating the dead iron layer of the hearth after the blast furnace is stopped, the drill is drilled until the surface of the carbon brick between the dead iron layer of the hearth and the cooling wall during the drilling.
As a preferable technical solution of the method for treating a dead iron layer of a hearth after the blast furnace is shut down, the step of introducing the static blasting expanding agent into the accommodating hole specifically includes: and guiding the static blasting expanding agent into the accommodating hole by using a drainage tube.
As a preferable technical scheme of the method for treating the dead iron layer of the hearth after the blast furnace is shut down, the method further comprises the following steps of: providing CaO powder and water with the temperature of 15-20 ℃, and mixing the CaO powder and the water according to the weight ratio of 1: 4-1: and 5, preparing according to a proportion, mixing and stirring for a second time period to obtain the static blasting expanding agent.
As a preferable technical solution of the method for treating a dead iron layer in a hearth after the blast furnace is stopped, the following steps are further provided between the step S10 and the step S20: and dividing the hearth into two parts, wherein the first part of the hearth is an area where the edge of the cutting opening extends to the center of the hearth, the second part of the hearth is an area of the hearth except for the first part of the hearth, the step S20 and the step S30 are firstly carried out on the first part of the hearth, and then the step S20 and the step S30 are repeated on the second part of the hearth.
The invention has the beneficial effects that: because the accommodation hole extends along the thickness direction of the dead iron layer of the furnace hearth, when the static blasting expanding agent is guided into the accommodation hole, the static blasting expanding agent is favorably permeated into the inside of the dead iron layer of the furnace hearth, the cracking speed of the dead iron layer of the furnace hearth is accelerated, and the operation efficiency is favorably improved. In the method, the static blasting expanding agent is used for replacing the explosive in the prior art, the static blasting expanding agent enters the side wall of the accommodating hole, so that the dead iron layer of the furnace hearth in the area adjacent to the accommodating hole is cracked, the noise and vibration generated when the dead iron layer of the furnace hearth is cracked are small, the cooling pipe on the blast furnace is prevented from being cracked, the operation is simple, and the safety is good.
Drawings
The invention is explained in more detail below with reference to the figures and examples.
FIG. 1 is a plan view of a dead iron layer of a hearth according to an embodiment.
FIG. 2 is a schematic view of a partial structure of a blast furnace according to the embodiment.
In the figure:
100. a furnace body; 200. a hearth; 300. a furnace shell; 400. a furnace bottom;
1. a furnace shell cutting opening; 2. a furnace wall; 3. a hearth dead iron layer; 4. and (6) drilling a hole.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
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 being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely 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.
As shown in fig. 1, the invention provides a method for treating a dead iron layer of a hearth after a blast furnace is stopped, wherein a static blasting expanding agent is provided in the method, and the method specifically comprises the following steps:
and S10, cooling the furnace to enable the surface temperature of the dead iron layer 3 to be T1, and cutting the furnace skin in the pore channel area of the dead iron layer 3 discharged from the furnace hearth during furnace shutdown to obtain a furnace skin cutting opening 1. T1 is the surface temperature of the hearth dead iron layer when the hearth dead iron layer is cooled, and T1 is more than or equal to 40 ℃. Specifically, the furnace is cooled through the hearth dead iron layer 3, so that the surface temperature of the hearth dead iron layer 3 is less than 50 ℃. In the embodiment, the furnace is cooled through the hearth dead iron layer 3, so that the surface temperature of the hearth dead iron layer 3 is 48 ℃. It can be understood that the blast furnace comprises a furnace body 100, a hearth 200 and a furnace bottom 400 which are sequentially arranged from top to bottom, the furnace wall 2 of the hearth 200 comprises a furnace shell, a cooling wall and a carbon brick layer which are sequentially arranged from outside to inside, the carbon brick layer contains a hearth dead iron layer 3, and in actual operation, when the furnace shell cutting opening 1 is formed, the cooling wall of the corresponding area is simultaneously taken out. After the furnace shell cutting opening 1 is completely opened, bulk materials and dust on the surface of a dead iron layer are blown and blown by compressed air, the furnace shell cutting opening 1 is positioned in an area between two iron outlets, and the furnace shell cutting opening 1 is spaced from the two iron outlets to prevent the iron outlets from being damaged.
And step S20, marking a marking line on the peripheral area containing the coke on the surface of the dead iron layer 3 of the hearth to obtain a marking area. In this embodiment, the indication area is circular, but in other embodiments, the indication area may have other shapes, such as triangle, rectangle, oval or other shapes.
Step S30, determining a drilling point 4 in the marked area, drilling the drilling point 4 along the thickness direction of the dead iron layer 3 of the hearth to obtain a containing hole, introducing a static blasting expanding agent into the containing hole, plugging the hole opening of the containing hole, cracking the dead iron layer 3 of the hearth at intervals of a first time period, and then clearing the cracked dead iron layer 3 of the hearth from the furnace shell cutting opening 1 to the outside of the hearth 200. Wherein, the thickness direction of the dead iron layer 3 of the hearth is the same as the thickness direction of the furnace shell.
Specifically, the static blasting expanding agent is in a liquid state. After the static blasting expanding agent is guided into the accommodating hole, because the temperature of the middle part of the furnace hearth dead iron layer 3 is up to dozens or even hundreds of ℃ within a period of time after the furnace hearth dead iron layer 3 is stopped, the static blasting expanding agent is rapidly expanded under the action of high temperature in the accommodating hole, so that hard and brittle pig iron in the furnace hearth dead iron layer 3 is broken, and the furnace hearth dead iron layer 3 is broken. The setup of furnace skin cutting opening 1 mainly reduces the thickness of oven, provides the expansion space for the blasting of the dead iron layer 3 of crucible, makes the dead iron layer 3 of crucible have sufficient space expansion on the oven, and then the fracture, and in addition, the setting of furnace skin cutting opening 1 still is favorable to the outside of cleaing away the dead iron layer 3 of cracked crucible to crucible 200. Because the accommodation hole extends along the thickness direction of the dead iron layer 3 of the furnace hearth, when the static blasting expanding agent is guided into the accommodation hole, the static blasting expanding agent is favorably permeated into the inside of the dead iron layer 3 of the furnace hearth, the cracking speed of the dead iron layer 3 of the furnace hearth is accelerated, and the operation efficiency is favorably improved. In the method, the static blasting expanding agent is used for replacing the explosive in the prior art, the static blasting expanding agent enters the side wall of the accommodating hole, so that the hearth dead iron layer 3 in the area adjacent to the accommodating hole is cracked, the noise and vibration generated when the hearth dead iron layer 3 is cracked are small, the cooling pipe on the blast furnace is prevented from being cracked, the operation is simple, and the safety is good.
In order to ensure that the furnace shell cutting opening 1 provides enough space for the expansion of the furnace hearth dead iron layer 3, in the embodiment, the furnace shell 300 is cut along the area L1 above the furnace hearth dead iron layer 3 and along the area L2 below the furnace hearth dead iron layer 3, so that the furnace shell cutting opening 1 completely covers the pore canal of the furnace hearth dead iron layer 3 during the furnace shutdown, wherein the L1 is more than or equal to 400mm and less than or equal to 700mm, and the L2 is more than or equal to 200 mm. In this embodiment, L1 is 500mm to ensure a sufficient expansion space between the upper end of the furnace shell cutting opening 1 and the upper end of the hearth dead iron layer 3, and L2 is 200mm to protect the carbon bricks of the furnace bottom 400.
Preferably, the furnace shell cutting openings 3 are formed in an arc shape along the circumferential direction of the furnace shell 2, in such a way that the furnace shell cutting openings 3 form an arc-shaped structure, and sufficient expansion space is provided for the dead iron layer 3 of the furnace shell.
Specifically, the diameter of the receiving hole is 40-50 mm. In this embodiment, the diameter of the accommodation hole is 45mm, and it is guaranteed that the accommodation hole has enough space inside to accommodate the static explosive expanding agent.
Before the identification areas are obtained, the weight of the furnace hearth dead iron layer 3 in each identification area is estimated, and the weight of the furnace hearth dead iron layer 3 in each identification area is 5-10 t. It can be understood that since the density of the hearth dead iron layer 3 is within a certain range, the weight of the hearth dead iron layer 3 can be roughly calculated by measuring the thickness and volume of the hearth dead iron layer 3. The weight of the hearth dead iron layer 3 in each identification area is controlled to be 5-10t, and the influence of the static blasting expanding agent on the fracture effect of the hearth dead iron layer 3 due to the fact that the weight of the hearth dead iron layer 3 in each identification area is too large is prevented. In this embodiment, the weight of the hearth dead iron layer 3 inside each mark area is about 5.5 t.
Preferably, the distance between two adjacent accommodating holes is 200mm and 300mm, so as to separate the two adjacent accommodating holes, and avoid that the distance between the two adjacent accommodating holes is too small to influence the opening of the accommodating holes.
Furthermore, two adjacent accommodating holes are communicated through the communicating holes, the communicating holes are positioned at the non-end parts of the accommodating holes, and the two adjacent accommodating holes are communicated through the communicating holes, so that only one accommodating hole is required to be introduced with the static blasting expanding agent, and the static blasting expanding agent can flow into the other accommodating holes through the communicating holes, thereby accelerating the introduction speed of the static blasting expanding agent.
In this embodiment, the magnetic drill is used to drill the hearth dead iron layer 3. In order to prevent the carbon bricks from being damaged as much as possible, the drill hole is drilled to the surface of the carbon bricks between the dead iron layer 3 of the hearth and the cooling wall.
The specific steps of guiding the static blasting expanding agent into the accommodating hole are as follows: and guiding the static blasting expanding agent into the accommodating hole by using a drainage tube. Wherein, the drainage tube adopts the rubber material to make, and the drainage tube that the rubber material was made has good compliance and corrosion resistance, convenient to use. The diameter of the draft tube in this embodiment is 100 mm.
Specifically, the liquid outlet end of the drainage tube extends into the accommodating hole, the liquid inlet end of the drainage tube is installed on an air opening pipeline on the air opening platform, the drainage tube is used for guiding the static blasting expanding agent into the accommodating hole, then the liquid outlet end of the drainage tube is drawn out of the accommodating hole, and then the cylindrical plug is used for plugging the hole opening of the accommodating hole. Wherein the length of the cylindrical plug is 50-80 mm.
During actual operation, the static blasting expanding agent is blocked in the accommodating hole, the cracking of the furnace hearth dead iron layer 3 can be detected at an interval of 3.5h, and in order to enable the furnace hearth dead iron layer 3 to be fully cracked, the cracked furnace hearth dead iron layer 3 can be removed to the outside of the furnace hearth 200 only when the interval time is more than 3.5 h. In this embodiment, the static blasting expanding agent is blocked in the accommodating hole, and after 5 hours, compressed air is used to purge coke and powder on the surface of the dead iron layer, and then the broken dead iron layer 3 of the hearth is removed from the furnace shell cutting opening 1 to the outside of the hearth 200 by using a jack.
In the treatment method, the method further comprises the following steps of preparing a static blasting expanding agent: providing CaO powder and water with the temperature of 15-20 ℃, and mixing the CaO powder and the water according to the weight ratio of 1: 4-1: and 5, preparing according to a proportion, mixing and stirring for a second time period to obtain the static blasting expanding agent. In this embodiment, the mixing and stirring time is 1-2min, i.e. the second time period is 1-2 min. Mixing CaO powder and water according to a ratio of 1: 4-1: 5, the static blasting expanding agent obtained after mixing and stirring is ensured to have fluidity, so that the static blasting expanding agent can smoothly flow into the containing hole along the drainage tube. In practical operation, the sum of the time for mixing and stirring the CaO powder and the water and the time for introducing the CaO powder and the water into the accommodating hole is required to be not more than 3min so as to prevent the static blasting expanding agent from being out of service. In this embodiment, the total time of mixing, stirring, and introducing the CaO powder and the water into the accommodating hole does not exceed 2 min. The static explosive expanding agent is introduced into the containing hole and then blocks the hole opening of the containing hole.
It should be noted that when the orifice of the accommodating hole is blocked and the static blasting expanding agent is prepared, an operator must wear a protective mask and gloves to quickly get away from the dead iron layer 3 of the furnace hearth after the orifice of the accommodating hole is blocked, so as to prevent the dead iron layer 3 of the furnace hearth from being exploded in a large area under the action of the static blasting expanding agent and causing the operator to be injured.
In this embodiment, the following steps are further provided between step S10 and step S20: and (3) dividing the hearth into two parts, wherein the first part of the hearth is an area where the edge of the cutting opening extends to the center of the hearth, the second part of the hearth is an area of the hearth except the first part of the hearth, firstly performing the step S20 and the step S30 on the first part of the hearth, and then repeating the step S20 and the step S30 on the second part of the hearth. The furnace hearth is divided into a first part of furnace hearth and a second part of furnace hearth so as to divide the whole furnace hearth into smaller areas, and the static blasting expanding agent is convenient to crack the dead iron layer 3 of the furnace hearth.
In actual operation, after the dead iron layer 3 of the furnace hearth in the first part of the furnace hearth is completely removed, the second part of the furnace hearth is processed. And (3) for the first part of hearth and the second part of hearth, after the operation of the step (S30) is completed, detecting the identification areas corresponding to the first part of hearth and the second part of hearth, and if the identification areas in the first part of hearth or the second part of hearth are not broken, repeating the step (S30) in the identification areas which are not broken so as to ensure that all the identification areas are all broken gaps.
The method for processing the hearth dead iron layer 3 only needs 28 hours to complete the removal of the hearth dead iron layer 3 in the first part of the hearth, needs 66 hours to complete the removal of the hearth dead iron layer 3 in the second part of the hearth, and can remove the 900mm hearth dead iron layer 3 in about 106 hours in total consumption.
In the description herein, it is to be understood that the terms "upper," "lower," "left," "right," and the like are based on the orientation or positional relationship shown in the drawings for convenience in description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. A method for processing a dead iron layer of a hearth after the blast furnace is shut down is characterized in that a static blasting expanding agent is provided, and the method comprises the following steps:
step S10, cooling the furnace, enabling the temperature of the surface of the dead iron layer to be T1, and cutting a furnace shell in a pore channel area of the dead iron layer discharged from the furnace hearth during furnace shutdown to obtain a furnace shell cutting opening;
step S20, marking identification lines in the areas, containing coke, on the surface of the dead iron layer of the hearth to obtain identification areas;
step S30, determining a drilling point in the marked area, drilling along the thickness direction of the dead iron layer of the furnace hearth on the drilling point to obtain an accommodating hole, introducing the static blasting expanding agent into the accommodating hole, plugging the hole opening of the accommodating hole, cracking the dead iron layer of the furnace hearth at intervals of a first time period, and then clearing the cracked dead iron layer of the furnace hearth from the furnace shell cutting opening to the outside of the furnace hearth.
2. The method for treating the dead iron layer of the hearth after the blast furnace is stopped as claimed in claim 1, wherein T1 is not less than 40 ℃.
3. The method for processing the dead iron layer of the hearth after the blast furnace is stopped, as claimed in claim 1, wherein the skin is cut along a region L2 away from the upper part of the dead iron layer of the hearth at L1 and from the lower part of the dead iron layer of the hearth, so that the skin cutting opening completely covers a tunnel for discharging the dead iron layer of the hearth at the time of stopping, wherein L1 is 400mm or more and 700mm or less, and L2 is 200mm or more.
4. The method for treating the dead iron layer of the hearth after the blast furnace is stopped as claimed in claim 3, wherein the furnace shell cutting openings are formed in an arc shape along the surrounding direction of the hearth.
5. The method for processing the dead iron layer of the hearth after the blast furnace is stopped as claimed in claim 1, wherein the weight of the dead iron layer of the hearth in each identification area is estimated before the identification areas are obtained, so that the weight of the dead iron layer of the hearth in each identification area is 5-10 t.
6. The method as claimed in claim 5, wherein the distance between two adjacent receiving holes is 200-300 mm.
7. The method as claimed in claim 1, wherein the hole is drilled to the surface of the carbon brick between the dead iron layer and the cooling wall.
8. The method for treating the dead iron layer of the hearth after the blast furnace is stopped, as claimed in claim 1, wherein the step of introducing the static blasting expanding agent into the accommodating hole comprises: and guiding the static blasting expanding agent into the accommodating hole by using a drainage tube.
9. The method for treating the dead iron layer of the hearth after the blast furnace is stopped as claimed in any one of claims 1 to 7, further comprising the steps of preparing the static blasting expanding agent: providing CaO powder and water with the temperature of 15-20 ℃, and mixing the CaO powder and the water according to the weight ratio of 1: 4-1: and 5, preparing according to a proportion, mixing and stirring for a second time period to obtain the static blasting expanding agent.
10. The method for processing the dead iron layer of the hearth after the blast furnace is stopped according to any one of claims 1 to 7, wherein the following steps are further provided between the step S10 and the step S20: and dividing the hearth into two parts, wherein the first part of the hearth is an area where the edge of the cutting opening extends to the center of the hearth, the second part of the hearth is an area of the hearth except for the first part of the hearth, the step S20 and the step S30 are firstly carried out on the first part of the hearth, and then the step S20 and the step S30 are repeated on the second part of the hearth.
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| CN113739594A (en) * | 2021-09-22 | 2021-12-03 | 新疆宜化化工有限公司 | Automatic breaking process and device for preventing hardening of materials in calcium carbide furnace |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6431073B1 (en) * | 1998-01-14 | 2002-08-13 | North American Industrial Services, Inc. | Device, system and method for on-line explosive deslagging |
| CN102733399A (en) * | 2012-07-04 | 2012-10-17 | 江苏省华建建设股份有限公司 | Method for removing internal support concrete by static expansion |
| CN104154831A (en) * | 2014-08-14 | 2014-11-19 | 贵州建工集团第一建筑工程有限责任公司 | Cubic stone expansion and blasting method |
| CN104807382A (en) * | 2015-03-27 | 2015-07-29 | 湖南牧雨智能科技有限公司 | Efficient, safe and environment-friendly post-water-injection type static blasting method and water injection device using same |
| CN105003296A (en) * | 2015-08-10 | 2015-10-28 | 华北理工大学 | Method for treating low air permeability coal seam gas discharge |
| CN105135960A (en) * | 2015-09-08 | 2015-12-09 | 中建八局第四建设有限公司 | Static blasting method of stonework |
| CN107119158A (en) * | 2017-06-09 | 2017-09-01 | 河钢股份有限公司承德分公司 | A kind of residual iron placing method of schreyerite steelmaking furnace |
| CN112414237A (en) * | 2020-10-28 | 2021-02-26 | 云南迪庆有色金属有限责任公司 | Method for treating over-hard surrounding rock by natural caving method |
-
2021
- 2021-04-16 CN CN202110410980.2A patent/CN113122665A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6431073B1 (en) * | 1998-01-14 | 2002-08-13 | North American Industrial Services, Inc. | Device, system and method for on-line explosive deslagging |
| CN102733399A (en) * | 2012-07-04 | 2012-10-17 | 江苏省华建建设股份有限公司 | Method for removing internal support concrete by static expansion |
| CN104154831A (en) * | 2014-08-14 | 2014-11-19 | 贵州建工集团第一建筑工程有限责任公司 | Cubic stone expansion and blasting method |
| CN104807382A (en) * | 2015-03-27 | 2015-07-29 | 湖南牧雨智能科技有限公司 | Efficient, safe and environment-friendly post-water-injection type static blasting method and water injection device using same |
| CN105003296A (en) * | 2015-08-10 | 2015-10-28 | 华北理工大学 | Method for treating low air permeability coal seam gas discharge |
| CN105135960A (en) * | 2015-09-08 | 2015-12-09 | 中建八局第四建设有限公司 | Static blasting method of stonework |
| CN107119158A (en) * | 2017-06-09 | 2017-09-01 | 河钢股份有限公司承德分公司 | A kind of residual iron placing method of schreyerite steelmaking furnace |
| CN112414237A (en) * | 2020-10-28 | 2021-02-26 | 云南迪庆有色金属有限责任公司 | Method for treating over-hard surrounding rock by natural caving method |
Non-Patent Citations (2)
| Title |
|---|
| 刘清荣 等: "静态破碎的研究和应用", 《江西有色金属》 * |
| 罗新伟: "《静态爆破在拆除工程中的应用》", 《工程施工》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113739594A (en) * | 2021-09-22 | 2021-12-03 | 新疆宜化化工有限公司 | Automatic breaking process and device for preventing hardening of materials in calcium carbide furnace |
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