CN111349736B - Treatment process for reducing blocking frequency of blast furnace hot blast valve - Google Patents
Treatment process for reducing blocking frequency of blast furnace hot blast valve Download PDFInfo
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- CN111349736B CN111349736B CN202010241695.8A CN202010241695A CN111349736B CN 111349736 B CN111349736 B CN 111349736B CN 202010241695 A CN202010241695 A CN 202010241695A CN 111349736 B CN111349736 B CN 111349736B
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- hot blast
- blast valve
- valve
- blast furnace
- reducing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/10—Other details, e.g. blast mains
- C21B9/12—Hot-blast valves or slides for blast furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/02—Brick hot-blast stoves
- C21B9/06—Linings
Abstract
The invention relates to a treatment process for reducing blocking frequency of a blast furnace hot blast valve, which comprises the following steps: a refractory material recovery tank is additionally arranged at the bottom of the hot blast valve; a retaining wall is arranged at the bottom of the hot blast valve branch pipe; optimizing the operation mode of the hot blast stove; the three treatment processes can achieve the aim of reducing the blocking frequency of the hot blast valve.
Description
Technical Field
The invention relates to the technical field of hot blast stove fault treatment processes, in particular to a treatment process for reducing blocking frequency of a hot blast valve of a blast furnace.
Background
In the internal combustion type and internal combustion type top combustion modified hot blast stove, because the brick falls off or the refractory brick is seriously pulverized on the partition wall (fire well), the hot blast outlet or a large wall brick above the hot blast outlet, the hot blast valve is frequently blocked by the accumulation of the refractory brick or refractory powder (material) and cannot be closed due to the lowest position of a bottom plate of the hot blast valve and the limited width of the sealing position of the hot blast valve in the air supply process. Because the hot blast stove can not be normally fired, the blast furnace is forced to stop blowing, and the blow-down bottom plate of the hot blast valve is opened for cleaning. Before the hot blast stove is maintained and treated, the hot blast valve is blocked by blowing air, and the blast furnace is forced to frequently stop blowing repeatedly. Not only results in reduced blast furnace capacity, increased fuel consumption, but even worsens blast furnace conditions, affecting the iron and steel balance of the company and increasing the system cost.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a treatment process for reducing the blocking frequency of a hot blast valve of a blast furnace, which can achieve the aim of reducing the blocking frequency of the hot blast valve.
The technical purpose of the invention is realized by the following technical scheme: a treatment process for reducing blocking frequency of a blast furnace hot blast valve comprises the following steps: a refractory material recovery tank is additionally arranged at the bottom of the hot blast valve; the bottom plate of the hot blast valve is detached, the refractory material recovery tank which is manufactured offline in advance is installed, the size of an upper interface of the refractory material recovery tank body is required to be completely consistent with the size of the original hot blast valve bottom plate and the size of a screw hole, and a pipe head and a blow-down valve are installed at the bottom of the refractory material recovery tank.
In one embodiment, the refractory recovery tank is internally covered with a heat insulating refractory.
In one embodiment, the treatment mode of adding the refractory recovery tank needs to be prepared in advance, and the opportunity of blast furnace damping down is selected for next time or step by step.
In one embodiment, the method further comprises the following steps: a retaining wall is arranged in the hot blast valve branch pipe; firstly, the hot blast valve is lifted out of the hot blast valve branch pipe to form a construction gap, a fire blocking screen is arranged in the hot blast valve branch pipe to block high temperature, refractory bricks on the inner wall of the hot blast valve branch pipe are knocked to form a concave-convex surface, a pouring mold is arranged on the concave-convex surface, then holes are drilled among brick seams on the concave-convex surface, stainless steel bars are implanted into the holes, the stainless steel bars and the pouring mold are welded and fixed, finally, pouring materials are poured into the mold, and the pouring materials are condensed to form the retaining wall.
In one embodiment, after the hot blast valve is lifted out and before the hot blast valve is blocked in the branch pipe of the hot blast valve, a blind plate is put into a three-way port on one side of the hot blast main pipe.
In one embodiment, the construction gap width is 700 mm.
In one embodiment, the casting mold comprises a casting baffle and a casting framework, wherein the casting framework is arranged between the two casting baffles; the height of the casting mould is higher than that of the hot blast valve.
In one embodiment, the fire screen is removed after the castable material has set to form the retaining wall.
In one embodiment, the treatment mode that the retaining wall is arranged at the bottom in the hot blast valve branch pipe needs to be prepared in advance, and the machine selection is carried out next time or step by step when a blast furnace has a damping down opportunity.
In one embodiment, the method further comprises the following steps: optimizing the operation mode of the hot blast stove; mode adjustment can be carried out in production, and the brick dropping hot blast stove only supplies air once per shift; the basic mode during the burning period of the brick dropping hot blast stove is 'three burning one delivery'; according to the actual running states of other three hot blast stoves, when falling brick hot blast stove air supply, only take the air supply of the hot blast stove with poorer air supply capability, the air supply period is 2 hours, and the mode is 'two burning two sending' during air supply.
In conclusion, the invention has the following beneficial effects:
firstly, the process has three steps of treatment processes, and at least one step of treatment is selected according to requirements to carry out treatment on the hot blast valve;
secondly, a refractory material recovery tank is additionally arranged at the bottom of the hot blast valve, so that the requirements of blast furnace air temperature and air pressure can be met, air leakage is avoided after the blast furnace is put into the hot blast valve, the shell surface temperature is less than or equal to 150 ℃, and refractory powder (material) can fall into the refractory material recovery tank to avoid influencing the normal use of the hot blast valve;
thirdly, the retaining wall is arranged at the bottom in the branch pipe of the hot blast valve, so that refractory powder (materials) can be effectively prevented from falling into the hot blast valve;
fourthly, the blast furnace is reduced to zero from 7-8 times (even twice a day) in one month before blockage of the hot blast valve is treated; before the hot blast stove is maintained, the problem that the firebrick is blocked by the hot blast valve to frequently stop the blast furnace is comprehensively solved, the influence on the technical index of the blast furnace is reduced to the minimum, and the hot blast stove has good popularization significance.
Drawings
FIG. 1 is a schematic view showing a refractory recovery tank installed at the bottom of a hot blast valve;
FIG. 2 is a schematic view showing a flow path of a retaining wall provided in a hot blast valve branch pipe;
FIG. 3 is a schematic view of a hot blast valve manifold as installed in a casting mold;
FIG. 4 is a schematic view showing the positions of the retaining wall and the hot blast valve branch pipes.
In the figure: 1-hot blast valve, 2-refractory material recovery tank, 3-heat insulation refractory material, 4-blow-down valve, 5-hot blast valve branch pipe, 6-retaining wall, 7-pouring baffle, 8-brick joint, 9-pouring framework and 10-stainless steel bar.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
It should be noted that all the directional terms such as "upper" and "lower" referred to herein are used with respect to the view of the drawings, and are only for convenience of description, and should not be construed as limiting the technical solution.
Referring to fig. 1, a treatment process for reducing blocking frequency of a blast furnace hot blast valve comprises the following steps: a refractory material recovery tank 2 is additionally arranged at the bottom of the hot blast valve 1; the bottom plate of the hot blast valve 1 is detached, the refractory material recovery tank 2 which is manufactured in an off-line mode in advance is installed, the refractory material recovery tank 2 is installed at the bottom of the hot blast valve 1, the size of an upper interface of the refractory material recovery tank 2 is required to be completely consistent with the size of the bottom plate of the original hot blast valve 1 and the size of a screw hole, and a pipe head and a blow-down valve 4 are installed at the bottom of the refractory material recovery tank 2; recovering refractory material by using the refractory material recovery tank 2; since the refractory temperature is very high, the refractory recovery tank 2 is covered with the heat insulating refractory 3 as a refractory layer.
The treatment mode of adding the refractory material recovery tank 2 needs to be prepared in advance, and the opportunity of selecting the blast furnace is implemented for the next time or step by step.
Referring to fig. 2, the present invention further includes: the bottom of the hot blast valve branch pipe 5 is provided with a retaining wall 6 to reduce the blocking of the hot blast valve 1; the method specifically comprises the following steps:
s1: firstly, the hot blast valve 1 is lifted out of the hot blast valve branch pipe 5 to form a construction gap;
s2: a fire shield is arranged in the hot blast valve branch pipe 5, and the fire shield is arranged at a position which is more than 800-1000 mm away from the port of the hot blast valve 1;
s3: during construction, high temperature is blocked, a blunt tool (such as a hammer) is used for knocking refractory bricks on the inner wall of the hot blast valve branch pipe 5 to form a concave-convex surface, and a casting mold is arranged on the concave-convex surface (see figure 3);
s4: drilling holes among the brick joints 8 of the refractory bricks by using drilling equipment, then implanting stainless steel bars 10 into the holes, and welding and fixing the stainless steel bars 10 and a casting mold;
s5: pouring a pouring material into the mold, wherein the pouring material is condensed to form a retaining wall 6 (shown in figure 4); for avoiding influencing the influence of the rising of blast furnace air supply pressure on the production of the blast furnace because of the influence of the pouring retaining wall 6, the effect of blocking bricks is achieved, and the height of the retaining wall 6 is 20-27% of the inner diameter of the hot blast valve branch pipe 5 in normal design.
After the hot blast valve 1 is lifted out, a blind plate is placed in a three-branch opening on one side of a hot blast main pipe before the hot blast valve is blocked in a branch pipe 5 of the hot blast valve; and heat insulation is realized.
The width of the construction gap is 700 mm; the construction personnel can conveniently enter the construction gap for construction.
The casting mold comprises casting baffles 7 and a casting framework 9, wherein the casting framework 9 is arranged between the two casting baffles 7; the height of the casting mould is higher than that of the hot blast valve 1; after the dust passes through the casting mold, the dust directly bypasses the hot blast valve 1, so that the influence on the hot blast valve 1 is avoided; and after the castable is condensed to form the retaining wall 6, the fire screen is removed.
The treatment mode that the retaining wall 6 is arranged at the bottom in the hot blast valve branch pipe 5 needs to be prepared in advance, and the machine selection is implemented next time or step by step when a blast furnace has a damping down opportunity.
The invention also includes: optimizing the operation mode of the hot blast stove; mode adjustment can be carried out in production, and the brick dropping hot blast stove only supplies air once per shift; the basic mode during the burning period of the brick dropping hot blast stove is 'three burning one delivery'; according to the actual running states of other three hot blast stoves, when falling brick hot blast stove air supply, only take the air supply of the hot blast stove with poorer air supply capability, the air supply period is 2 hours, and the mode is 'two burning two sending' during air supply.
Example (b):
the method is applied to blocking of a hot blast valve 1 of a 3200m3 (internal combustion type) hot blast stove and a 1050m3 (internal combustion type is changed into top combustion type) hot blast stove. The blowing down of a single 1050m3 blast furnace is reduced to zero from 7-8 times (even 2 times a day, 3-4 hours per blowing down) in the previous month due to the blockage of the hot blast valve 1. The damping down rate is reduced by 2.5%, the monthly iron yield is reduced and the loss is 1.8 ten thousand tons, the fuel ratio is reduced and the loss of about 10 kilograms of iron per ton, and the furnace condition of the blast furnace is recovered to a smooth state. The investment is only about 3-5 ten thousand yuan, and the cost-reducing benefit of the moon is more than 200 ten thousand yuan.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (9)
1. A treatment process for reducing blocking frequency of a blast furnace hot blast valve is characterized by comprising the following steps: a refractory material recovery tank is additionally arranged at the bottom of the hot blast valve; removing the bottom plate of the hot blast valve, installing a refractory material recovery tank which is manufactured in an off-line mode in advance, requiring that the size of an upper interface of the refractory material recovery tank body is completely consistent with that of an original hot blast valve bottom plate and that of a screw hole, and installing a pipe head and a blow-down valve at the bottom of the refractory material recovery tank;
a retaining wall is arranged at the bottom of the hot blast valve branch pipe; firstly, a hot blast valve is lifted out of a hot blast valve branch pipe to form a construction gap, a fire blocking screen is arranged in the hot blast valve branch pipe, the position of the hot blast valve is isolated from the hot blast valve branch pipe, refractory bricks on the inner wall of the hot blast valve branch pipe are knocked to form a concave-convex surface, a pouring mold is arranged on the concave-convex surface, holes are drilled among brick seams on the concave-convex surface, stainless steel bars are implanted into the holes, the stainless steel bars and the pouring mold are welded and fixed, finally, pouring materials are poured into the mold, and the pouring materials are condensed to form a retaining wall.
2. The process for reducing the blocking frequency of a blast furnace hot blast valve according to claim 1, wherein the refractory recovery tank is internally covered with a heat insulating refractory.
3. The process for treating the blast furnace hot blast valve blockage frequency according to claim 1, wherein the treatment mode of additionally installing the refractory recovery tank needs to be prepared in advance, and the opportunity of blast furnace damping down is selected for next time or step by step.
4. The process for reducing the frequency of blockage of a blast furnace hot blast valve according to claim 1, wherein a blind plate is placed in a three-way opening on one side of a hot blast main pipe before the blockage is arranged in a branch pipe of the hot blast valve after the hot blast valve is lifted out.
5. The treatment process for reducing the blocking frequency of the blast furnace hot blast valve according to claim 1, wherein the width of the construction gap is 700 mm.
6. The process for reducing the blocking frequency of a blast furnace hot blast valve according to claim 1, wherein the mold comprises pouring baffles and a pouring framework, wherein the pouring framework is arranged between the two pouring baffles; the height of the casting mould is higher than that of the hot blast valve.
7. The process for reducing the blocking frequency of a blast furnace hot blast valve according to claim 1, wherein the fire screen is removed after the castable is condensed to form a retaining wall.
8. The process for reducing the blocking frequency of the blast furnace hot blast valve as claimed in claim 1, wherein the treatment mode of arranging the retaining wall at the bottom in the branch pipe of the hot blast valve is prepared in advance, and the machine selection is performed next time or step by step when the blast furnace has a damping down opportunity.
9. The treatment process for reducing the blocking frequency of the blast furnace hot blast valve according to claim 1, further comprising: optimizing the operation mode of the hot blast stove; mode adjustment can be carried out in production, and the brick dropping hot blast stove only supplies air once per shift; the basic mode during the burning period of the brick dropping hot blast stove is 'three burning one delivery'; according to the actual running states of other three hot blast stoves, when falling brick hot blast stove air supply, only take the air supply of the hot blast stove with poorer air supply capability, the air supply period is 2 hours, and the mode is 'two burning two sending' during air supply.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010241695.8A CN111349736B (en) | 2020-03-31 | 2020-03-31 | Treatment process for reducing blocking frequency of blast furnace hot blast valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010241695.8A CN111349736B (en) | 2020-03-31 | 2020-03-31 | Treatment process for reducing blocking frequency of blast furnace hot blast valve |
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| CN111349736A CN111349736A (en) | 2020-06-30 |
| CN111349736B true CN111349736B (en) | 2022-01-11 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1272041A (en) * | 1969-05-28 | 1972-04-26 | Kinney Eng Inc S P | Blast furnace stove burner assembly |
| CN85100769A (en) * | 1985-04-01 | 1986-08-20 | 首都钢铁公司 | Novel evaporative cooling high wind temperature hot blast valve |
| CN202755011U (en) * | 2012-05-14 | 2013-02-27 | 秦皇岛秦冶重工有限公司 | Hot blast valve |
| CN105369002A (en) * | 2015-12-09 | 2016-03-02 | 天津钢铁集团有限公司 | Repair tooling of hot-blast branch pipe lining of hot-blast furnace and repair method thereof |
| CN206232767U (en) * | 2016-12-07 | 2017-06-09 | 石家庄钢铁有限责任公司 | A kind of device that can improve Combustion of Hot Air Furnace valve service life |
| CN206345871U (en) * | 2017-01-19 | 2017-07-21 | 秦皇岛市秦星冶金设备有限公司 | A kind of bituminous shale oil refining special hot-blast valve with automatic pollutant removal function |
-
2020
- 2020-03-31 CN CN202010241695.8A patent/CN111349736B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1272041A (en) * | 1969-05-28 | 1972-04-26 | Kinney Eng Inc S P | Blast furnace stove burner assembly |
| CN85100769A (en) * | 1985-04-01 | 1986-08-20 | 首都钢铁公司 | Novel evaporative cooling high wind temperature hot blast valve |
| CN202755011U (en) * | 2012-05-14 | 2013-02-27 | 秦皇岛秦冶重工有限公司 | Hot blast valve |
| CN105369002A (en) * | 2015-12-09 | 2016-03-02 | 天津钢铁集团有限公司 | Repair tooling of hot-blast branch pipe lining of hot-blast furnace and repair method thereof |
| CN206232767U (en) * | 2016-12-07 | 2017-06-09 | 石家庄钢铁有限责任公司 | A kind of device that can improve Combustion of Hot Air Furnace valve service life |
| CN206345871U (en) * | 2017-01-19 | 2017-07-21 | 秦皇岛市秦星冶金设备有限公司 | A kind of bituminous shale oil refining special hot-blast valve with automatic pollutant removal function |
Non-Patent Citations (1)
| Title |
|---|
| 莱钢1~#热风炉空气入口特护生产实践;王尚东等;《冶金丛刊》;20130615(第03期);第40-42页 * |
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