CN112048585A - Blast furnace taphole hole opening method - Google Patents
Blast furnace taphole hole opening method Download PDFInfo
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- CN112048585A CN112048585A CN202010788086.4A CN202010788086A CN112048585A CN 112048585 A CN112048585 A CN 112048585A CN 202010788086 A CN202010788086 A CN 202010788086A CN 112048585 A CN112048585 A CN 112048585A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/12—Opening or sealing the tap holes
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- Organic Chemistry (AREA)
- Blast Furnaces (AREA)
Abstract
The invention relates to a blast furnace taphole pore channel opening method, belongs to the technical field of blast furnace front operation, and solves the technical problems that a taphole is easy to leak and the quality of a pore channel is poor in the process of opening a blast furnace, so that the normal discharge of the blast furnace is influenced. The invention analyzes the different influences of the feeding speed of the tapping machine, the striking, the feeding speed of the trolley, the compressed air blowing, the spraying, the drill rod pulling-back operation and the like on the tapping process, and comprehensively uses the tapping technologies, so that the easy leakage points of the hole channel can pass through smoothly, and the normal operation of the hole channel of the taphole is ensured; the times of burning the iron notch by using the large oxygen are reduced, the waste of oxygen and an oxygen blowing pipe is avoided, and meanwhile, the occurrence of safety accidents in the process of burning the large oxygen is also reduced; the cost of using the drill rod and the iron rod for multiple times is reduced, the chance of human-computer contact in the process of using the drill rod and the iron rod is reduced, and the probability of safety accidents is reduced; the environment-friendly events in the blasting starting process and the re-opening process are reduced when secondary blasting pressing opening operation is carried out.
Description
Technical Field
The invention belongs to the technical field of blast furnace front operation, and particularly relates to a blast furnace taphole pore opening method.
Background
The quality of the iron notch channel is the most important factor influencing the iron discharge of the blast furnace slag, and the method for opening the iron notch of the blast furnace is the most important factor influencing the quality of the iron notch channel. However, in actual operation, the tapping time is short and the tap hole leaks due to the unreasonable tapping method. The first case is a phenomenon in which the tapping time is much lower than the normal control range; in the second case, the molten iron flows out not directly in front of the opening but in another direction different from the opening direction, but the iron flow rate of the molten iron is much smaller than the normal flow rate, or the phenomenon of decreasing the flow or no flow occurs.
The blast furnace iron notch leakage phenomenon seriously influences the blast furnace safety production, and the harm is mainly as follows:
1. after the iron notch leaks, a new drill rod and an iron rod need to be replaced to open the iron notch, and the iron notch opening cost is increased.
2. If the drill rod and the iron rod are bonded in the iron notch by the iron slag due to the leakage of the iron notch when the iron notch is drilled or poked, a stokehold worker needs to burn the iron notch by using the large oxygen, and the operation has a large amount of iron slag flying out from the iron notch at high speed in the process of burning the iron notch, thereby causing great influence on the safety of the operator who burns the iron notch.
3. If the tapping hole leaks, the tapping time and the tapping time can be prolonged, so that slag iron in the furnace can not be discharged in time, and the furnace is subjected to wind holding, blanking is slowed down, and the furnace temperature is increased.
The conventional treatment method comprises the following steps:
1. and a new drill rod is replaced to flush the place where the taphole leaks, but the flushing probability is low, and a new drill rod can be damaged.
2. If the iron notch leaks deeply (the leaking point is 100mm before the normal iron notch depth), the iron rod can be used for poking to pass through the leaking point.
3. And (4) burning an iron notch by using large oxygen, burning the iron notch to pass through a leakage point, and then opening by using an opening machine or an iron rod.
4. And (5) re-blasting the mud to open the hole. And (3) re-driving the stemming through the hydraulic gun, and after 3-5 min, after the stemming re-driven into the leakage point part is condensed, reusing the drill rod opening to flush the leakage point opening.
Disclosure of Invention
In order to overcome the defects of the prior art and solve the technical problems that the iron notch is easy to leak and the quality of the hole channel is poor in the opening process of the blast furnace to influence the normal discharge of the blast furnace, the method for opening the hole channel of the iron notch of the blast furnace is provided, the iron notch can safely pass through the easy-leaking point in one step, no leaking point exists in the hole channel drilling process, the permeability and the quality of the hole channel are ensured, and therefore the smooth tapping of the blast furnace is ensured, the air pressure in the blast furnace is stable, the discharging is smooth, and the quality of molten iron is stable.
The invention is realized by the following technical scheme.
A blast furnace taphole hole opening method comprises the following steps:
1) judging the position of the easy leakage point of the blast furnace taphole channel, and starting from the initial position of the opening of the blast furnace taphole channel, rapidly opening the blast furnace taphole channel to 100mm before the easy leakage point by using the high-grade drill rod rotating speed, high-grade striking, high-grade trolley feeding speed, compressed air injection and low-grade spraying by using an opening machine;
2) reducing the rotating speed of the drill rod of the tapping machine to the rotating speed of a low-grade drill rod, and stopping striking; using a drill rod pulling-back operation method in combination with the pressure generated by blowing compressed air to bring stemming powder generated by opening holes into an iron notch pore channel; continuously blowing compressed air by using low-grade drill rod rotation speed and high-grade spraying, slowly opening the depth of the taphole to 200mm after the easy-leakage point appears, and finishing opening at the easy-leakage point position of the blast furnace taphole channel;
3) and the rotating speed of the drill rod of the tapping machine is recovered to the high-grade rotating speed of the drill rod, the striking is recovered to the high-grade striking, the compressed air is continuously blown by the low-grade spraying, the high-speed tapping is carried out to the design depth of the opening of the hole channel, and the opening of the hole channel of the blast furnace taphole is completed.
Further, the rotating speed of a high-grade drill rod of the tapping machine is 450rpm, and the rotating speed of a low-grade drill rod of the tapping machine is 90 rpm; the high-grade striking of the tapping machine is 105 times/min, and the low-grade striking is 35 times/min; the feeding speed of a high-grade trolley of the tapping machine is 0.2m/s, and the feeding speed of a low-grade trolley of the tapping machine is 0.1 m/s; the pressure of blowing compressed air of the tapping machine is 600 KPa; the flow rate of high-grade spraying of the tapping machine is 1.2L/min, and the flow rate of low-grade spraying of the tapping machine is 0.8L/min.
Compared with the prior art, the invention has the beneficial effects that:
the method can prevent the phenomenon of iron notch drilling leakage, ensure the iron notch tapping quality, stabilize the air pressure in the furnace, stabilize the material speed and improve the quality of molten iron.
The number of times of burning the iron notch by using the large oxygen is reduced, the waste of oxygen and the oxygen blowing pipe is avoided, and meanwhile, the occurrence of safety accidents in the process of burning the large oxygen is also reduced.
The cost of using the drill rod and the iron rod for multiple times is reduced, the chance of man-machine contact in the process of using the drill rod and the iron rod is reduced, and the probability of safety accidents is reduced.
And fourthly, the occurrence of environmental protection events in the blasting starting process and the re-opening process during the secondary blasting opening operation is reduced.
Direct annual economic benefits are: 64.35 ten thousand yuan. (calculated according to the unit price of the drill pipe of 325 yuan/one, 0.5 drill pipe is saved in each furnace, 360 days of annual operation are spent, 11 furnaces are spent, and the calculation process is as follows: 325 × 0.5 × 360 × 11=64.35 ten thousand yuan).
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. Unless otherwise specified, the examples follow conventional experimental conditions. In addition, it will be apparent to those skilled in the art that various modifications or improvements can be made to the material components and amounts in these embodiments without departing from the spirit and scope of the invention as defined in the appended claims.
Taking a No. 3 blast furnace of our company as an example, the depth of a normal taphole is 2800-3000 mm.
1) And judging the position of the easy leakage point of the blast furnace iron notch channel, and starting from the opening starting position of the blast furnace iron notch channel, quickly opening the blast furnace iron notch channel to 100mm (namely, quickly opening the iron notch to 2400 mm) before the easy leakage point by using a high-grade drill rod with the rotating speed of 450rpm, high-grade striking for 105 times/min, the feeding speed of a high-grade trolley for 0.2m/s, blowing compressed air pressure (600 KPa) and low-grade spraying (the flow is 0.8L/min) by using an opening machine. Because the stemming of the iron notch pore channel is baked uniformly before the leakage-prone point, the rotating speed of a high-grade drill rod, high-grade striking and the feeding speed of a high-grade trolley can be used so as to prevent a drill bit from being blocked in the pore channel and rough the pore channel; the purpose of blowing compressed air is to blow stemming powder formed by drilling out the pore channel; the purpose of the low-grade spray is to reduce the temperature of the drill bit and make the drill bit durable.
2) After the iron opening is quickly opened to 2400mm, reducing the rotating speed of a drill rod of the tapping machine to the rotating speed of a low-grade drill rod, and stopping striking; using a drill rod pulling-back operation method in combination with the pressure generated by blowing compressed air to bring stemming powder generated by opening holes into an iron notch pore channel; and (3) continuously blowing compressed air by using high-grade spray (the flow is 1.2L/min) with the low-grade drill rod rotating speed of 90rpm, slowly opening the depth of the taphole to 200mm (namely slowly opening the depth of the taphole to 2700 mm) after the easy-leakage point appears, and finishing the opening at the easy-leakage point position of the blast furnace taphole channel. The rotating speed of the drill rod is reduced to a low gear so as to increase the circumferential cutting force; the striking is stopped in order to prevent the shock generated by striking from tearing the iron notch pore canal, and the pore canal is more fragile particularly near the easy-to-leak point; the feeding speed of the low-grade trolley is also used for preventing the pore canal near the easy-leakage point from being torn; the high-grade spraying is that the temperature of the pore channel near the easy-leakage point is higher, so that the slag iron is very easy to break through leakage from the high-temperature point, the temperature at the position can be reduced through the high-grade spraying, and the leakage chance is reduced; the purpose of the operation of pulling back the drill rod is that the opening stemming powder is not easy to blow out due to the high-grade spraying at the moment, and the opening stemming powder is brought out of the iron notch pore channel by combining the operation of pulling back the drill rod with the force of compressed air, so that the forward resistance of the drill rod is reduced, and the opening is easy.
3) And after the depth of the iron notch is slowly opened to 2700mm, the rotating speed of a drill rod of the tapping machine is recovered to the rotating speed of 450rpm of a high-grade drill rod, the striking is recovered to the high-grade striking for 105 times/min, low-grade spraying (the flow is 0.8L/min), compressed air is injected (the pressure is 600 KPa), the high-speed opening is opened to the design depth of the opening of the hole channel (namely the high-speed opening is 2800-3000 mm), and the opening of the hole channel of the blast furnace iron notch is completed.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (2)
1. A blast furnace taphole pore opening method is characterized by comprising the following steps:
1) judging the position of the easy leakage point of the blast furnace taphole channel, and starting from the initial position of the opening of the blast furnace taphole channel, rapidly opening the blast furnace taphole channel to 100mm before the easy leakage point by using the high-grade drill rod rotating speed, high-grade striking, high-grade trolley feeding speed, compressed air injection and low-grade spraying by using an opening machine;
2) reducing the rotating speed of the drill rod of the tapping machine to the rotating speed of a low-grade drill rod, and stopping striking; using a drill rod pulling-back operation method in combination with the pressure generated by blowing compressed air to bring stemming powder generated by opening holes into an iron notch pore channel; continuously blowing compressed air by using low-grade drill rod rotation speed and high-grade spraying, slowly opening the depth of the taphole to 200mm after the easy-leakage point appears, and finishing opening at the easy-leakage point position of the blast furnace taphole channel;
3) and the rotating speed of the drill rod of the tapping machine is recovered to the high-grade rotating speed of the drill rod, the striking is recovered to the high-grade striking, the compressed air is continuously blown by the low-grade spraying, the high-speed tapping is carried out to the design depth of the opening of the hole channel, and the opening of the hole channel of the blast furnace taphole is completed.
2. The method for opening the taphole shaft of the blast furnace according to claim 1, wherein: the rotating speed of a high-grade drill rod of the tapping machine is 450rpm, and the rotating speed of a low-grade drill rod of the tapping machine is 90 rpm; the high-grade striking of the tapping machine is 105 times/min, and the low-grade striking is 35 times/min; the feeding speed of a high-grade trolley of the tapping machine is 0.2m/s, and the feeding speed of a low-grade trolley of the tapping machine is 0.1 m/s; the pressure of blowing compressed air of the tapping machine is 600 KPa; the flow rate of high-grade spraying of the tapping machine is 1.2L/min, and the flow rate of low-grade spraying of the tapping machine is 0.8L/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010788086.4A CN112048585B (en) | 2020-08-07 | 2020-08-07 | Blast furnace taphole hole opening method |
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| CN202010788086.4A CN112048585B (en) | 2020-08-07 | 2020-08-07 | Blast furnace taphole hole opening method |
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| CN112048585A true CN112048585A (en) | 2020-12-08 |
| CN112048585B CN112048585B (en) | 2022-02-08 |
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Citations (7)
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|---|---|---|---|---|
| CN1072960A (en) * | 1991-12-02 | 1993-06-09 | 首都钢铁公司 | Hydraulic tapping machine for blast furnace |
| JP2006249562A (en) * | 2005-03-14 | 2006-09-21 | Nippon Steel Corp | Method for controlling hydraulic boring machine for iron tapping hole |
| JP2012188718A (en) * | 2011-03-11 | 2012-10-04 | Sumitomo Metal Ind Ltd | Hole-opening control method of blast furnace tap-hole opening machine |
| CN104141021A (en) * | 2014-08-28 | 2014-11-12 | 中冶南方工程技术有限公司 | Method and equipment system for forming tapping hole in blast furnace |
| CN108690893A (en) * | 2017-04-12 | 2018-10-23 | 上海宝冶集团有限公司 | The restorative procedure in blast furnace taphole stream iron duct |
| CN110628973A (en) * | 2018-08-23 | 2019-12-31 | 广东韶钢松山股份有限公司 | Treatment method for iron leakage of blast furnace iron notch |
| CN110760632A (en) * | 2019-11-08 | 2020-02-07 | 广东韶钢松山股份有限公司 | Method for stably controlling depth of blast furnace taphole with different furnace capacities |
-
2020
- 2020-08-07 CN CN202010788086.4A patent/CN112048585B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1072960A (en) * | 1991-12-02 | 1993-06-09 | 首都钢铁公司 | Hydraulic tapping machine for blast furnace |
| JP2006249562A (en) * | 2005-03-14 | 2006-09-21 | Nippon Steel Corp | Method for controlling hydraulic boring machine for iron tapping hole |
| JP2012188718A (en) * | 2011-03-11 | 2012-10-04 | Sumitomo Metal Ind Ltd | Hole-opening control method of blast furnace tap-hole opening machine |
| CN104141021A (en) * | 2014-08-28 | 2014-11-12 | 中冶南方工程技术有限公司 | Method and equipment system for forming tapping hole in blast furnace |
| CN108690893A (en) * | 2017-04-12 | 2018-10-23 | 上海宝冶集团有限公司 | The restorative procedure in blast furnace taphole stream iron duct |
| CN110628973A (en) * | 2018-08-23 | 2019-12-31 | 广东韶钢松山股份有限公司 | Treatment method for iron leakage of blast furnace iron notch |
| CN110760632A (en) * | 2019-11-08 | 2020-02-07 | 广东韶钢松山股份有限公司 | Method for stably controlling depth of blast furnace taphole with different furnace capacities |
Non-Patent Citations (2)
| Title |
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| 杨士岭等: "济钢1号1750m~3高炉开口机降低钻杆和钻头消耗实践", 《江西冶金》 * |
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