CN109628674B - Method for overhauling gas sealing cover at top of blast furnace - Google Patents
Method for overhauling gas sealing cover at top of blast furnace Download PDFInfo
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- CN109628674B CN109628674B CN201811562088.0A CN201811562088A CN109628674B CN 109628674 B CN109628674 B CN 109628674B CN 201811562088 A CN201811562088 A CN 201811562088A CN 109628674 B CN109628674 B CN 109628674B
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- C21—METALLURGY OF IRON
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- C21B7/00—Blast furnaces
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Abstract
The invention provides a method for overhauling a gas sealing cover at the top of a blast furnace, which comprises the following steps: the cross temperature measuring rod of the blast furnace body is removed, a mounting hole of the cross temperature measuring rod on the blast furnace body is left, and an air pipe is mounted at the mounting hole; communicating the air pipe with dust removal equipment; loading blast material and water slag material into the blast furnace, and lowering the material line in the blast furnace to be below the position of the cross temperature measuring rod; a protection shed is arranged in a gas sealing cover at the top of the blast furnace, so that the protection shed, a blast furnace body and the charge level in the blast furnace form a relatively closed space; and the dust removing equipment is utilized to pump away and discharge coal gas generated by the charge level in the blast furnace from the air pipe, so that the coal gas is prevented from being connected to the upper part of the protection shed. The method for overhauling the blast furnace top gas fan cover greatly reduces the gas content in the sealing cover, and achieves the aims of safely overhauling, shortening the overhauling time, reducing the labor intensity of workers and improving the production efficiency of the blast furnace.
Description
Technical Field
The invention belongs to the field of maintenance of blast furnace top equipment, and particularly relates to a maintenance method of a blast furnace top gas sealing cover.
Background
At the gas sealing cover and the ascending pipe part of the blast furnace top, the gas sealing cover and the ascending pipe part are easy to damage and fall off due to the serious scouring of the dust-containing air flow in the center of the furnace because the temperature of the furnace top is high and fluctuates frequently. The refractory material of the blast furnace top gas sealing cover and the first-generation furnace age of the blast furnace cannot be synchronous, so the sealing cover needs to be overhauled when the blast furnace is in a damping down process. The gas-burning furnace is required to be operated for a long time, and gas is generated in the furnace all the time, so that the gas-burning furnace belongs to maintenance operation in a limited gas closed space.
Blast furnace smelting is a long-term continuous production process, and how to quickly and safely achieve the purpose of maintenance in equipment maintenance, so that shortening the maintenance period is an effective means for improving the production efficiency of a blast furnace. At present, when a domestic blast furnace enters a gas sealing cover for maintenance, the control of coal gas is controlled by long-time damping down of pressurized water slag, the actual effect can only guarantee the temperature of the operation environment, the content of the coal gas in the sealing cover can not be effectively reduced, the maintenance time in the sealing cover is long, the replacement frequency of required maintenance personnel is high, the maintenance quality cannot be guaranteed, and the potential safety hazard of coal gas poisoning is very large.
The statements in the background section are merely prior art as they are known to the inventors and do not, of course, represent prior art in the field.
Disclosure of Invention
In view of one or more of the problems in the prior art, the present invention provides a method of servicing a blast furnace top gas enclosure, comprising the steps of:
1) the cross temperature measuring rod of the blast furnace body is removed, a mounting hole of the cross temperature measuring rod on the blast furnace body is left, and an air pipe is mounted at the mounting hole;
2) communicating the air pipe with dust removal equipment;
3) loading blast material and water slag material into the blast furnace, and lowering the material line in the blast furnace to be below the position of the cross temperature measuring rod;
4) a protection shed is arranged in a gas sealing cover at the top of the blast furnace, so that the protection shed, a blast furnace body and the charge level in the blast furnace form a relatively closed space;
5) the dust removing equipment is utilized to pump coal gas generated by the charge level in the blast furnace away from the air pipe and discharge the coal gas, so that the coal gas is prevented from being mixed above the protective shed;
6) and (4) overhauling the gas sealing cover at the top of the blast furnace.
The plane of the protection shed in the step 4) is locally sealed, the protection shed, the blast furnace body and the charge level in the blast furnace form a relatively closed space, namely the protection shed made of materials with good sealing performance is adopted as much as possible, so that the coal gas generated by the charge level under the protection shed is not easy to reach the upper area of the protection shed through the protection shed, and the concentration of the coal gas above the protection shed in the gas sealing cover at the top of the blast furnace is effectively controlled and reduced.
The protection shed in the step 4) comprises a first protection shed and a second protection shed. The first protective shed is arranged at a position which is 0.8m away from the lower edge of the blast furnace top steel ring and is used for replacing the primary and/or secondary steel ring and/or repairing the welding seam of the blast furnace shell; the second protection shed is arranged at a position 0.3m away from the lower edge of the blast furnace top gas ascending pipe and is used for patching of welding seams of the blast furnace top gas sealing cover and/or welding and/or spraying of anchoring nails.
The method provided by the invention can also adjust the air quantity through the air door actuator of the fan of the dust removing equipment. The dust removal equipment can adopt the furnace top dust removal equipment of the blast furnace, other dust suction points of the furnace top dust removal equipment can be completely closed when the dust removal equipment is used, and the air volume is adjusted through an air door actuator of a dust removal fan, so that coal gas generated by the charge level is pumped away and discharged in a negative pressure mode from a dust removal pipeline, the coal gas is prevented from being mixed to the upper part of a protection shed, and convenience is created for personnel to enter the furnace for maintenance operation.
The air volume is enough to ensure that the highest coal gas concentration area above the protection shed is not more than 100ppm, and the temperature is the same as that outdoors.
And 3) after the blast furnace is charged with damping materials and water slag materials, completely plugging the tuyere of the blast furnace with refractory mortar to reduce the furnace pressure of the blast furnace.
The method provided by the invention also comprises the step of installing an inspection hole on the air pipe for detecting the concentration of the coal gas pumped from the air pipe, wherein the concentration of the coal gas detected by the method provided by the invention is 0.8-1.5%.
The method provided by the invention also comprises the step of installing a nitrogen injection device on the dust removal equipment to ensure that the concentration of the coal gas is not within 12.5-74% of the explosion limit range of the mixture of the coal gas and the air.
Based on the technical scheme, the method for overhauling the blast furnace top gas fan cover greatly reduces the gas content in the sealing cover, and achieves the aims of safely overhauling, shortening the overhauling time, reducing the labor intensity of workers and improving the production efficiency of the blast furnace. Compared with the prior art, the method has the following beneficial effects:
1) the maintenance method provided by the invention adopts a maintenance mode of damping down but not lowering a stockline when entering the blast furnace top gas sealing cover for maintenance, can ensure that the blast furnace can be quickly recovered to produce after the maintenance is finished, and improves the production efficiency of the blast furnace;
2) the furnace top dust removing equipment of the blast furnace is used for carrying out negative pressure type pumping away remote emission control on the coal gas in the furnace, and the coal gas is effectively controlled and reduced to enter the maintenance space above the protection shed in the furnace top sealing cover of the blast furnace, so that the coal gas content of the maintenance space is reduced, and the safety of maintenance personnel is ensured.
3) The dust removal fan used by the invention has higher power, can quickly discharge coal gas in the furnace and reduce the temperature in the furnace, and the highest coal gas concentration area above the protective shed does not exceed 100ppm and has the same temperature as outdoor. The method makes it possible for large amount of workers to enter the furnace for operation, thereby achieving the purposes of safe maintenance, shortening the maintenance time and reducing the labor intensity of workers.
4) According to the method, the air pipe is provided with the inspection hole, the concentration of the extracted coal gas can be detected at regular time, and the nitrogen injection device is arranged on the dust removing equipment, so that the concentration of the coal gas is always ensured within a safe range, and the life safety of maintainers is ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the principle of the maintenance method of the blast furnace top gas hood provided by the present invention;
the reference numbers in the figures denote:
1-mounting holes; 2-air pipe; 3-material level; 4-a first protective shed; 5-a second protective shed.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Fig. 1 shows a schematic diagram of a principle of a method for overhauling a blast furnace top gas hood provided by the invention. As shown in fig. 1, when a gas hood at the top of a blast furnace is overhauled, a cross temperature measuring rod of a blast furnace body is removed, a mounting hole 1 of the cross temperature measuring rod on the blast furnace body is reserved, and an air pipe 2 is mounted at the mounting hole; the air pipe 2 is communicated with a dust removal device which can be a furnace top dust removal device of the blast furnace and is used for pumping and discharging coal gas generated by the charge level in the blast furnace away from the air pipe so as to prevent the coal gas from crossing the protection shed; loading blast material and water slag material into the blast furnace, and lowering the material line in the blast furnace to be below the position of the cross temperature measuring rod; a protection shed (explained in detail below) is arranged in a gas sealing cover at the top of the blast furnace, so that the protection shed, a blast furnace body and a charge level 3 in the blast furnace form a relatively closed space; as the plane of the used material of the protective shed is locally sealed, the protective shed made of the material with good sealing property is selected as much as possible, so that the coal gas generated by the charge level in the furnace is not easy to enter the area above the protective shed through the protective shed, and the concentration of the coal gas in the area above the protective shed is controlled and reduced. The space formed by the protective shed, the blast furnace body and the charge level is a relatively closed space.
According to a preferred embodiment of the present invention, as shown in fig. 1, the protection shed comprises a first protection shed 4 and a second protection shed 5, wherein the first protection shed 4 is at a position 0.8m away from the lower edge of the blast furnace top ring, and is used for replacing primary and/or secondary ring steel and/or repairing the welding seam of the blast furnace shell; the second protective shed 5 is arranged at a position 0.3m away from the lower edge of the blast furnace top gas ascending pipe and is used for patching of welding seams of the blast furnace top gas sealing cover and/or welding and/or spraying of anchoring nails.
According to a preferred embodiment of the invention, as shown in fig. 1, when a gas hood at the top of a blast furnace is overhauled, 4 cross temperature measuring rods of a blast furnace body are completely removed, 4 mounting holes 1 of the cross temperature measuring rods on the blast furnace body are left, 4 air pipes 2 are mounted at the mounting holes 1, and then the cross temperature measuring rods are collected into a dust removing main pipe and then connected with a pipeline of dust removing equipment at the top of the blast furnace to form a relatively closed area with a protective shed erected in the furnace, negative pressure is formed through a fan, and air volume is adjusted by using a fan door actuator of the fan. Because the dust removal fan has higher power, the coal gas in the furnace can be quickly discharged, the temperature in the furnace can be reduced, the highest coal gas concentration area above the protective shed does not exceed 100ppm, and the temperature is the same as that outdoors. The method makes it possible for large batch of personnel to enter the furnace for operation, thereby achieving the purposes of safe maintenance, shortening the maintenance time, reducing the labor intensity of workers and improving the production efficiency of the blast furnace.
According to a preferred embodiment of the invention, the overhaul method provided by the invention is characterized in that an inspection hole is further arranged on the dust removal main pipe, the concentration of the pumped gas is detected at regular time, and the detected gas concentration range is between 0.8% and 1.5%, and the gas concentration range does not reach the explosion limit range of 12.5% to 74% of the gas and air mixture; and the bag is blown on the dust removing equipment body to increase the frequency of nitrogen blowing, thereby ensuring that the safety requirement is met.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for overhauling a gas sealing cover at the top of a blast furnace is characterized by comprising the following steps:
1) the cross temperature measuring rod of the blast furnace body is removed, a mounting hole of the cross temperature measuring rod on the blast furnace body is left, and an air pipe is mounted at the mounting hole;
2) communicating the air pipe with dust removal equipment;
3) loading blast material and water slag material into the blast furnace, and lowering the material line in the blast furnace to be below the position of the cross temperature measuring rod;
4) a protection shed is arranged in a gas sealing cover at the top of the blast furnace, so that the protection shed, a blast furnace body and the charge level in the blast furnace form a relatively closed space;
5) the dust removing equipment is utilized to pump coal gas generated by the charge level in the blast furnace away from the air pipe and discharge the coal gas, so that the coal gas is prevented from being mixed above the protective shed;
6) and (4) overhauling the gas sealing cover at the top of the blast furnace.
2. The method according to claim 1, wherein the plane of the protective shed in step 4) is partially sealed, and the protective shed forms a relatively closed space with the blast furnace body and the charge level in the blast furnace, so that the concentration of the gas above the protective shed in the gas seal cover of the top of the blast furnace is effectively controlled and reduced.
3. The method of claim 1 or 2, wherein the protection shelter in step 4) comprises a first protection shelter and a second protection shelter.
4. The method of claim 3, wherein the first protection canopy is installed at a position 0.8m from a lower edge of the blast furnace roof ring for replacement of the primary and/or secondary ring and/or repair of the welding seam of the blast furnace roof.
5. A method according to claim 3, wherein said second protection canopy is installed at a position 0.3m from the lower edge of the blast furnace top gas riser for the patching of the welds of the blast furnace top gas enclosure and/or the welding and/or spraying of the anchoring studs.
6. The method of claim 1, wherein the amount of air flow is adjustable by a damper actuator of a fan of the dust extraction device.
7. The method as claimed in claim 6, wherein the air volume is such that the highest gas concentration area above the protection shed is not more than 100ppm and the temperature is the same as that outdoors.
8. The method as claimed in claim 1, wherein after the blast furnace is charged with the damping down material and the slag material, the method further comprises the step of completely blocking the tuyere of the blast furnace with the refractory mortar to reduce the pressure of the blast furnace in step 3).
9. The method of claim 1, wherein an inspection hole is further installed on the air hose for detecting the concentration of the gas pumped out of the air hose.
10. The method of claim 9, wherein a nitrogen gas injection device is further installed on the dust removing device to ensure that the concentration of the gas is not within the explosion limit range of gas and air mixture.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811562088.0A CN109628674B (en) | 2018-12-20 | 2018-12-20 | Method for overhauling gas sealing cover at top of blast furnace |
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| CN201811562088.0A CN109628674B (en) | 2018-12-20 | 2018-12-20 | Method for overhauling gas sealing cover at top of blast furnace |
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| CN109628674B true CN109628674B (en) | 2020-10-27 |
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| CN113406144A (en) * | 2021-05-11 | 2021-09-17 | 包头钢铁（集团）有限责任公司 | Mixed gas heat value metering method |
| CN114480769B (en) * | 2022-01-28 | 2023-02-10 | 新疆八一钢铁股份有限公司 | Method for treating harmful gas in Ou metallurgical furnace body |
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| JPH073310A (en) * | 1993-02-25 | 1995-01-06 | Nippon Valqua Ind Ltd | Structure of sealing cover |
| CN104046712B (en) * | 2014-06-30 | 2015-10-07 | 莱芜钢铁集团有限公司 | A kind of constructional method of blast furnace gas sealing cover thermofin |
| CN105441611B (en) * | 2016-01-13 | 2017-07-25 | 山西太钢不锈钢股份有限公司 | A kind of blast furnace roof changes stock rod method |
| CN108531675A (en) * | 2018-06-01 | 2018-09-14 | 新兴铸管股份有限公司 | A kind of blast furnace top ignition method |
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