JPH08311514A - Device for digging furnace core of blast furnace - Google Patents

Abstract

PURPOSE: To dig a furnace core from a tuyere of a blast furnace with a small size device, to improve a gas ventilation and a liquid permeability in the blast furnace and to stabilize the furnace condition by fitting a metallic rod connectable with a hitting device provided with a driving device as a device for activating a furnace core part of the blast furnace. CONSTITUTION: In the case of increasing the using ratio of pulverized coal in low cost instead of expensive bulky coke for blast furnace in order to reduce the unit production cost of iron-making in the blast furnace, the gas ventilation and the liquid perpeability at the lower part of the furnace are deteriorated caused by the powdering of raw material and the furnace condition in the blast furnace is unstabilized. In this case, a body frame 4 provided with a wheel 11 on a working floor 3 at the front of the tuyere 1 of the blast furnace is arranged so as to be capable of advance/retreat, and the metallic rod or metallic pipe 10 connectable with the hitting device 5 connected with the driving device 6 is fitted on this body frame. The furnace core part is dug by inserting the metallic rod 10 from the tuyere 1 and hitting with a hitting device 5 to improve the gas ventilation and the liquid permeability of the furnace core part at the lower part of the blast furnace, and the blast furnace operation is stabilized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for excavating a core from a tuyere of a blast furnace.

[0002]

2. Description of the Related Art A blast furnace for iron making can produce a large amount of pig iron and has a high thermal efficiency of 90%. Therefore, the mainstream of pig iron production is still maintained. However, since the blast furnace is a huge countercurrent moving bed, it has problems in productivity, production elasticity, etc. Further improvement of controllability is desired in order to secure a stable production amount and hot metal quality. ing. On the other hand, in the blast furnace, from the viewpoint of strengthening the competitiveness of the iron source, operation using cheap raw fuel and high pulverized coal ratio operation are being implemented. Under the above operation, the pulverization of ore and coke increases, and the powder rate in the lower part of the furnace containing unburned char increases, which makes it difficult to secure the air permeability and liquid permeability of the furnace core. Therefore, establishment of an effective furnace core activation technique is desired.

As a method for activating the core when the air permeability and liquid permeability of the core are lowered, there are some direct and surgical methods other than the conventional fuel ratio increase and steam addition. A furnace core activation method is disclosed. Japanese Patent Laid-Open No. 06-0933
In Japanese Patent Laid-Open No. 19 and Japanese Patent Application Laid-Open No. 06-093320, the characteristics of the furnace core portion are measured through a plurality of tuyere for each rest wind to determine the state of the furnace core portion, and the tuyere in the vicinity of a heating-required portion is determined. Discloses a method of providing a ventilation hole in the core by inserting a hollow pipe and sampling coke in the core.
Further, in Japanese Patent Application Laid-Open No. 06-083783, the core powder ratio is measured at rest or during operation, and when the powder ratio is 20% or more, a hollow pipe is inserted from a tuyere in the vicinity of a required heating / powder removal site. Then, a method for providing a hollow vent hole in the furnace core by sampling coke in the furnace core is disclosed.

As a coke sampling device, for example, Japanese Patent Application Laid-Open No. 5-148521 discloses a device including a driving carriage, a rail, and a driving device for the carriage.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
According to the method disclosed in Japanese Patent No. 521, the device is large and the transportability is poor, so that the tuyere excavation at about two places is the limit within a normal downtime. In addition, in order to set a long metal pipe (about 5 m) and a gold rod corresponding to the charging depth in the tuyere sampler, a flat surface of 10 m in the radial direction and 5 m in the circumferential direction is provided in front of the tuyere for core digging. This is the minimum requirement, and the tuyere that can be used for core digging is limited to 1/4 or less of all tuyere due to space constraints. For this reason, restrictions are imposed on the excavation of tuyere in which the air volume is difficult to enter, the excavation considering the circumferential balance, and the like, and it becomes difficult to exert 100% of the core heating effect by the core excavation method.

In view of the above problems of the prior art, it is an object of the present invention to solve the above problems by downsizing the core digging device and improving the method of inserting a gold rod or a metal pipe. I am trying.

[0007]

That is, the present invention is
(1) It has a striking device to which a gold rod or a metal pipe inserted from the tuyere into the furnace core can be attached, and a driving device for advancing and retracting the striking device in the horizontal direction, and the striking device and the driving device are mounted. It is characterized by consisting of a dolly.

(2) In (1), the striking device is arranged on the tuyere side, and the driving device is arranged coaxially.

(3) In (1), the striking device is arranged on the tuyere side, and the hydraulic cylinder is arranged above or below the striking device.

(4) In any one of the above (1) to (3), the gold rod or the metal pipe is divided so that it can be fitted in the longitudinal direction.

[0011]

2 and 3 (a) and 3 (b) respectively show an apparatus of one embodiment of the present invention, (a) is a side view, and (b) is a sectional view taken along the line AA. Is.

FIGS. 4A and 4B are explanatory views of how to connect the driving pipes. The case of a driven pipe and the case of a driven metal rod are shown respectively. The driving pipe or the gold rod is divided in the length direction, and the connecting portion has a structure that can be easily fitted by the processing shown in FIG.

The driving device will be described below. 2A and 2B show an example of the apparatus according to claim 2. The body frame 4 has wheels 11 required to move on the blast furnace operating floor 3. At the time of driving, the tip hacker 7 is fixed to the hacker receiver 8 in the tuyere 1 and used as a fulcrum of the device. The striking device 5 is arranged on the tuyere 1 side on the main body frame 4, and the driving device 6 is arranged coaxially. The striking device 5 has a roller bearing 12 on the bottom surface in contact with the body frame 4 and a guide plate 14 on the contact side surface,
It has a mechanism that can prevent horizontal and vertical shake when driving.

The pipe 10 or metal rod for core digging having a fitting length of 1 to 2 m, shown in FIG. 4, is added to the inside of the blast furnace while sequentially adding it according to the target digging depth. By the impact of the impact device 5, it is pushed and inserted into the pushing jig 9. Reference numeral 1 is a tuyere, 2 is a blast furnace iron skin, 3
Is an operating floor, 4 is a main body frame, 5 is a striking device, 6 is a driving device, 7 is a hacker, 8 is a hacker receiver, 9 is a pushing jig, 10 is a driving pipe, 11 is a wheel, 12 is a roller bearing, 13 Is a pipe support, and 14 is a guide plate.

FIGS. 3A and 3B show an example of the apparatus according to claim 3. The major difference from FIG. 2 is the drive unit 6
The position is located below the striking device 5. As a result, the stroke of the drive device 6 can be shortened as compared with the driving device shown in FIG. The pressure of the driving device 6 is directly connected to the striking device 5 through the Z-shaped jig 15. The moment generated by the vertical displacement of the driving device and the striking device is killed by positioning the roller bearing 12 and the guide plate 14 as shown in FIG. It's smooth.
The method of inserting the gold rod or the metal pipe is the same as in the case of the device of FIG. Reference numeral 1 is a tuyere, 2 is a blast furnace iron skin, 3 is an operating floor, 4 is a main body frame, 5 is a striking device, 6 is a driving device,
7 is a hacker, 8 is a hacker receiver, 9 is a pushing jig, 10 is a driving pipe, 11 is wheels, 12 is a roller bearing, 13 is a pipe support, 14 is a guide plate, 15
Indicates a Z-shaped jig.

[0016]

【Example】

(Example 1) When a large blast furnace with an internal capacity of 4000 m ³ or more and 38 tuyere is in a blast, the apparatus shown in FIG. 2 is used to make the circumferential balance even, and 100 A from 8 tuyere
The metal pipe No. was driven at an insertion depth of 3 m. 2m pipe and 1m considering workability such as pipe transportation
The pipes were sequentially driven so that the total length was 3 m. In a preliminary survey, about 10 tuyere that could not be driven by this device were confirmed due to the space limitation in the operating floor. Although the time required to drive the pipe into the furnace core was about 10 minutes per location, it took about 8 hours to drive 8 locations, including the preparation time for moving the equipment and installing the equipment.

(Embodiment 2) When the large blast furnace with an internal capacity of 4000 m ³ or more and 38 tuyeres has a blast, the device shown in FIG. 3 is used to make the circumferential balance even from eight tuyeres. A 100 A metal pipe was driven at an insertion depth of 3 m. Considering workability such as transportation of pipes, a 2 m pipe and a 1 m pipe were sequentially driven to make a total of 3 m. In a preliminary study, there was no tuyere that could not be driven in with this device due to space restrictions in the operating floor due to the shortened length of the device. The time required for driving the pipe into the furnace core itself was about 10 minutes per cylinder as in Example 1, but the shortened length of the equipment increased the mobility and preparedness for equipment movement, equipment installation, etc. Together, the time required for the driving work at the eight locations was about 3 hours.

[0018]

As described above, the device of the present invention can achieve the following effects.

(1) In the conventional tuyere excavator represented by a coke sampler, the number of tuyere capable of core excavation was three or less due to space limitations and the mobility of the equipment. It is possible to drive all tuyere by using the device.

(2) In addition, the time required for driving one tuft is also shortened, and it is possible to drive more than half of all tuyere when there is no wind for about 10 hours.

As described above, the core activating work by the core excavation which is carried out when the wind is off can be carried out efficiently and effectively.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a blast furnace tuyere showing an outline of driving a hollow pipe into a furnace core according to the present invention.

2A is a side view of the first embodiment of the present invention, FIG.
(B) is a sectional view taken along line BB of (a).

FIG. 3A is a side view of a second embodiment of the present invention,
(B) is a sectional view taken along line BB of (a).

4 (a) is a driving pipe 1 shown in FIG. 2 and FIG.
It is a longitudinal cross-sectional view of 0, (b) is a vertical cross-sectional view of the driving rod 10.

[Explanation of symbols]

1: Tuyers 2: Blast furnace iron skin 3: Operating floor 4: Main body frame 5: Striking device 6: Drive device 7: Hacker 8: Hacker receiver 9: Pushing jig 10: Gold rod or metal pipe 11: Wheels 12: Roll Bearing 13: Pipe support 14: Guide plate 15: Z type jig 16: Pipe driving device 17: Furnace core 18: Cap 19: Button 20: Raceway 21: Bird's nest

Front page continuation (72) Inventor Morimasa Ichida 1 Kimitsu, Kimitsu-shi Kimitsu Works, Nippon Steel Co., Ltd. Tsu Steel Works (72) Inventor Finance Department Takeshi 46, Nakahara, Tobata-ku, Kitakyushu City, Fukuoka Prefecture 59 59 Nippon Steel Plant Design Co., Ltd. Mita International Building Sankyu Co., Ltd.

Claims (4)

[Claims] 1. A drive unit for horizontally advancing and retreating a striking device to which a gold rod or a metal pipe inserted from a tuyere into a furnace core can be attached, and a truck equipped with the striking device and the driving device. A blast furnace core digging device comprising: 2. The blast furnace core excavating device according to claim 1, wherein the striking device is arranged on the tuyere side, and the driving device is arranged coaxially. 3. The blast furnace core excavating device according to claim 1, wherein the striking device is arranged on the tuyere side, and the driving device is arranged on the upper side or the lower side of the striking device. 4. A gold rod or a metal pipe is divided so that it can be fitted in the lengthwise direction.
The blast furnace core excavating device according to any one of claims 1.