阅读说明：本技术 利用放残铁的方式完成炼铁高炉内积铁清除的施工方法 (Construction method for removing accumulated iron in iron-making blast furnace by using residual iron discharging mode ) 是由 姜利 孟丽利 郭金亮 徐云翔 杨威 刘晓军 赵荣辉 李国明 于 2020-07-04 设计创作，主要内容包括：一种利用放残铁的方式完成炼铁高炉内积铁清除的施工方法,属于高炉施工技术领域。施工步骤：放残铁位置的选择,放残铁眼标高的确定,残铁孔深度确定,铁水流向及存放的确定,残铁沟的制作、安装,残铁坑施工,放残铁的实施。优点在于,解决了传统“爆破及切割”存在的效率低、不利于安全施工、费用高和占用总工期时间比较长的问题；在保证施工安全的基础上,加快了施工进度,降低了费用,缩短了占用总工期的时间。(A construction method for removing accumulated iron in an iron-making blast furnace by using a residual iron discharging mode belongs to the technical field of blast furnace construction. The construction steps are as follows: selecting a position for placing the residual iron, determining the height of a residual iron placing eye mark, determining the depth of a residual iron hole, determining the flow direction and storage of molten iron, manufacturing and installing a residual iron ditch, constructing a residual iron pit, and implementing residual iron placing. The method has the advantages that the problems of low efficiency, unfavorable safety construction, high cost and long total construction period occupation time existing in the traditional 'blasting and cutting' are solved; on the basis of ensuring the construction safety, the construction progress is accelerated, the cost is reduced, and the time for occupying the total construction period is shortened.)

1. A construction method for removing accumulated iron in an iron-making blast furnace by using a residual iron discharging mode is disclosed, wherein a construction object is a 5500 cubic meter iron-making blast furnace; the construction method is characterized by comprising the following construction steps:

(1) selection of the location for placing the scrap

And finally determining the position of the residual iron in the current time by repeatedly surveying the periphery of the site: between the 1# and 4# iron openings in the north direction, a second 62# cooling wall (1) area;

(2) determination of residual iron eye elevation

According to the temperature detection and display of each layer of the hearth and the furnace bottom, calculating the maximum erosion depth of the hearth, and determining that the elevation of a residual iron eye is 9.3m, wherein the elevation is the upper position of a second layer of ceramic pad and is positioned at the middle upper position of a second section of 62# cooling wall (1);

(3) residual iron hole depth determination

At the elevation of 9.3 meters, the thickness of the American Union carbon brick is 1714mm, the American Union carbon brick is a elephant foot area, but the depth of the residual iron hole (2) is 1800mm-2000mm and the opening angle is 5-7 degrees at the current high temperature point;

(4) determination of molten iron flow direction and storage

The residual molten iron (3) of the blast furnace flows out from the right and the north below the iron yard, the residual molten iron (3) flows out, a residual iron pit (5) is built through a residual iron ditch (4), and the middle is divided into iron storage grids by refractory materials;

(5) manufacturing and installing the residual iron runner:

manufacturing and installing the residual iron runner (4) according to the field condition, ensuring the angle and the trend of the residual iron runner, and ensuring the bracket (6) of the residual iron runner to be firm;

(6) construction of residual iron pit

The residual iron pit (5) is a residual iron storage place, and residual molten iron (3) flowing out of the blast furnace is stored in the residual iron pit (5);

(7) practice of placing residual iron

After the blast furnace is shut down, the furnace shell is cut, a casting material layer and sundries in the furnace shell are cleaned, water is strictly prevented from being pumped to the position for cleaning, and a No. 62 cooling wall (1) is removed; drilling residual iron holes (2) in the furnace, drilling holes at a constant speed, measuring the drill bit size phi of 60mm, measuring the temperature every time the drill bit drills 200mm, stopping drilling when the temperature of the drilled hole channel changes, and burning and cutting the hole channel by using oxygen when the hole channel drills red or the temperature of the hole channel reaches 750 ℃; measuring the temperature of a pore channel by using a temperature measuring gun at the early stage and a thermocouple prepared by an instrument at the later stage, arranging a movable protective baffle at the front stage when drilling the residual iron hole (2), enabling a worker to take a protective mask to burn the residual iron hole (2), continuously roasting the residual iron hole (2) by using two oxygen pipes at two sides of the residual iron hole, and paying attention to the burning angle of the residual iron hole (2) to ensure concentricity, smoothness and straightness until the residual iron hole is burnt; when the residual molten iron (3) flows out of the residual iron holes (2), the residual iron runner (5) is ensured not to be blocked, the cut-off is dredged or the residual molten iron (3) is roasted by oxygen for flow assistance, the residual molten iron (3) is ensured to be discharged and cleaned, the residual molten iron (3) is ensured to flow and not to be solidified in the runner, and the iron runner is cleaned by oxygen blowing, steel rods and hollow plates when necessary; sampling and testing the residual molten iron (3) in time; and (4) after the residual molten iron (3) is completely discharged, blocking the hole opening of the residual iron, and finishing the residual iron discharging.

Technical Field

The invention belongs to the technical field of blast furnace construction, and particularly provides a construction method for removing accumulated iron in an iron-making blast furnace by using a residual iron discharging mode in the blast furnace overhaul construction, which is suitable for the construction of a slag iron project which is required to be accumulated in the furnace and cannot be discharged from an iron notch when the blast furnace is shut down in the blast furnace overhaul, and is particularly suitable for the residual iron discharging construction of the large and medium scale blast furnace overhaul.

Background

Aiming at the problem that accumulated iron in a furnace is removed before overhaul of a 2#5500 cubic meter iron-making blast furnace, the traditional construction method adopts blasting and flame cutting modes to remove the accumulated iron in the furnace, the blast furnace needs to be sprayed with water for cooling after stopping the furnace, the blast furnace can enter the furnace for blasting after the temperature is reduced, the accumulated iron in the furnace can be removed by matching with flame cutting if necessary, blast furnace equipment can be damaged very easily in the blasting process, and the environment is damaged in the flame cutting process.

The traditional construction method has the following problems: the time of occupying the total construction period is longer because the temperature in the furnace needs to be reduced; in the process of iron accumulation blasting, the blast furnace related equipment can be damaged to different degrees; during the flame cutting process, a large amount of smoke is generated, which can cause serious consequences of environmental pollution; and the defects of low time-consuming and labor-consuming working efficiency, low safety factor due to narrow construction site, high investment cost of various manpower and material resources and the like exist.

Disclosure of Invention

The invention aims to provide a construction method for removing accumulated iron in an iron-making blast furnace by using a residual iron discharging mode, which is used for removing the accumulated iron in the iron-making blast furnace in the blast furnace overhaul construction, and solves the problems of low efficiency, unfavorable safety construction, high cost and long total construction period occupation time of the traditional 'blasting and cutting'; on the basis of ensuring the construction safety, the construction progress is accelerated, the cost is reduced, and the time for occupying the total construction period is shortened.

The construction object of the invention is a 5500 cubic meter ironmaking blast furnace, and the construction steps are as follows:

(1) selection of the location for placing the scrap

And finally determining the position of the residual iron in the current time by repeatedly surveying the periphery of the site: between the 1# and 4# iron notch in the north direction, the second section 62# cooling wall 1 area.

(2) Determination of residual iron eye elevation

And (3) calculating the maximum erosion depth of the hearth according to the temperature detection and display of each layer of the hearth and the furnace bottom, and determining that the elevation of the residual iron eye is 9.3m, is the upper position of the second layer of ceramic pad and is positioned at the middle upper position of the second section 62# cooling wall 1.

(3) Residual iron hole depth determination

At the elevation of 9.3 meters, the thickness of the original American Union carbon brick is 1714mm, the position is a elephant foot area, but the depth of the residual iron hole 2 is preliminarily determined to be 1800mm-2000mm (the opening angle is 5-7 degrees) at the current high temperature point.

(4) Determination of molten iron flow direction and storage

In order to meet the requirements of production, safety and the like, the residual molten iron 3 of the blast furnace flows out from the right north below the iron yard, the residual molten iron 3 flows out, a residual iron pit 5 is built through a residual iron ditch 4, and the middle part is divided into iron storage grids by refractory materials.

(5) Manufacturing and installing the residual iron runner:

the residual iron runner 4 is manufactured and installed according to the field condition, the angle and the trend of the residual iron runner are ensured, and the support 6 of the residual iron runner is required to be firm.

(6) Construction of residual iron pit

The residual iron pit 5 is a residual iron storage site, and the residual molten iron 3 flowing out of the blast furnace is stored in the residual iron pit 5.

(7) Practice of placing residual iron

After the blast furnace is shut down, the furnace shell is cut, a casting material layer and sundries in the furnace shell are cleaned, water is strictly prevented from being pumped to the position for cleaning, and a No. 62 cooling wall 1 is removed; drilling 2 holes in the residual iron hole in the furnace at a constant speed (the drill bit size is phi 60mm), measuring the temperature when drilling 200mm, stopping drilling when the temperature of the hole channel changes and the hole channel is red or the temperature of the hole channel reaches 750 ℃, and burning with oxygen; a temperature measuring gun is used in the early stage, and a thermocouple prepared by an instrument is used in the later stage to measure the temperature of the pore passage, so that a specially-assigned person is required to take charge of monitoring and commanding; when the residual iron hole 2 is drilled, a movable protective baffle is arranged at the front section, a worker carries a protective mask, the residual iron hole 2 is burnt by a special person, two oxygen pipes are used at two sides of the residual iron hole 2, the roasting is carried out uninterruptedly, the roasting angle of the residual iron hole 2 is particularly noticed, and the concentricity, smoothness and straightness are ensured until the residual iron hole is burnt; after the residual molten iron 3 flows out of the residual iron hole 2, a special person needs to take care of the residual iron hole to ensure that the residual iron runner 5 is not blocked, and the flow cutoff needs to be dredged in time or flow assistance is roasted by oxygen to ensure that the residual molten iron 3 is discharged completely. When the residual molten iron 3 is placed, stokehold personnel are arranged at two sides of the residual iron ditch 5 to nurse the iron ditch, ensure that the residual molten iron 3 flows and is not solidified in the ditch, and if necessary, oxygen is blown, and the iron ditch is cleaned by steel rods and hollow plates; sampling and assaying the residual molten iron 3 in time; and (4) plugging the residual iron hole after the residual molten iron 3 is completely discharged, and finishing the residual iron discharging.

Drawings

FIG. 1 is a schematic view of a blast furnace residual iron discharging construction process. Wherein, the cooling wall 1, the residual iron hole 2, the residual molten iron 3, the residual iron groove 4, the residual iron pit 5 and the bracket 6.

Detailed Description

The following describes an embodiment of the present invention (taking Jingtang 2#5500 vertical iron-making blast furnace as an example) with reference to the accompanying drawings:

1. selection of the location for placing the scrap

And finally determining the position of the residual iron in the current time by repeatedly surveying the periphery of the site: between the 1# and 4# iron notch in the north direction, the second section 62# cooling wall 1 area.

2. Determination of residual iron eye elevation

And (3) calculating the maximum erosion depth of the hearth according to the temperature detection and display of each layer of the hearth and the furnace bottom, and determining that the elevation of the residual iron eye is 9.3m, is the upper position of the second layer of ceramic pad and is positioned at the middle upper position of the second section 62# cooling wall 1.

3. Residual iron hole depth determination

At the elevation of 9.3 meters, the thickness of the original American Union carbon brick is 1714mm, the position is a elephant foot area, but the depth of the residual iron hole 2 is preliminarily determined to be 1800mm-2000mm (the opening angle is 5-7 degrees) at the current high temperature point.

4. Determination of molten iron flow direction and storage

In order to meet the requirements of production, safety and the like, the residual molten iron 3 of the blast furnace flows out from the right north below the iron yard, the residual molten iron 3 flows out, a residual iron pit 5 is built through a residual iron ditch 4, and the middle part is divided into iron storage grids by refractory materials.

5. Manufacturing and installing the residual iron runner:

the residual iron runner 4 is manufactured and installed according to the field condition, the angle and the trend of the residual iron runner are ensured, and the support 6 of the residual iron runner is required to be firm.

6. Construction of residual iron pit

The residual iron pit 5 is a residual iron storage site, and the residual molten iron 3 flowing out of the blast furnace is stored in the residual iron pit 5.

7. Practice of placing residual iron

After the blast furnace is shut down, the furnace shell is cut, a casting material layer and sundries in the furnace shell are cleaned, water is strictly prevented from being pumped to the position for cleaning, and a No. 62 cooling wall 1 is removed; drilling 2 holes in the residual iron hole in the furnace at a constant speed (the drill bit size is phi 60mm), measuring the temperature when drilling 200mm, stopping drilling when the temperature of the hole channel changes and the hole channel is red or the temperature of the hole channel reaches 750 ℃, and burning with oxygen; a temperature measuring gun is used in the early stage, and a thermocouple prepared by an instrument is used in the later stage to measure the temperature of the pore passage, so that a specially-assigned person is required to take charge of monitoring and commanding; when the residual iron hole 2 is in use, a movable protective baffle is arranged at the front section, a worker carries a protective mask, the residual iron hole 2 needs to be burnt by a special person, two oxygen pipes are used at two sides of the residual iron hole 2, the roasting is carried out uninterruptedly, the roasting angle of the residual iron hole 2 is particularly noticed, and the concentricity, the smoothness and the straightness are ensured until the residual iron hole is burnt; after the residual molten iron 3 flows out of the residual iron hole 2, a special person needs to take care of the residual iron hole to ensure that the residual iron runner 4 is not blocked, and the flow cutoff needs to be dredged in time or flow assistance is roasted by oxygen to ensure that the residual molten iron 3 is discharged completely. When the residual molten iron 3 is placed, stokehold personnel are arranged at two sides of the residual iron ditch 4 to nurse the iron ditch, ensure that the residual molten iron 3 flows and is not solidified in the ditch, and if necessary, oxygen is blown, and the iron ditch is cleaned by steel rods and hollow plates; sampling and assaying the residual molten iron 3 in time; and (4) plugging the residual iron hole after the residual molten iron 3 is completely discharged, and finishing the residual iron discharging.