JPH10168507A - Lance for blast furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability to heat shock by a rapid temp. change and to prevent cracking by contact with a circumferential wall, etc., by constituting the front end pipe of a lance in such a manner that this front end pipe may be retreated from a blast branch pipeline and may be housed. SOLUTION: The lance 17 for a blast furnace comprises the front end pipe 19 made of ceramics, a fixing pipe part 20 for movably fixing the front end pipe 19, a guide pipe 21 for freely slidably supporting this fixing pipe part 20 in an axial line direction and a driving mechanism for driving the fixing pipe part 20. A handle 31 is operated to rectilinearly retreat and house the front end pipe 19 into a guide pipe 21 by the driving mechanism when repair work, etc., are carried out at the time of no-ventilation. Then, the damage of the heated front end pipe 19 made of the ceramics, etc., by coming into contact with the inside walls of a tuyere 18 and a blow pipe 15 does not arise. The heated front end pipe 19 is stowed into the guide pipe 21 and since a refractory heat insulating material 36 is disposed in the inlet nozzle part, the front end pipe is slowly cooled without being rapidly cooled and, therefore, the occurrence of the cracks, etc., by the heat shock is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a blast furnace lance which blows iron oxide powder, fine iron ore, dust, pulverized coal, oil, tar, coke, plastics, etc. from a blowing branch pipe of a blast furnace for iron making. It is.

[0002]

2. Description of the Related Art In general, a blowing branch pipe of a blast furnace for ironmaking blows high-pressure air at a high temperature (about 1200 to 1350 ° C.) at a high speed. In recent years, from the viewpoint of quality improvement, promotion of reduction, and economical viewpoint, an operation method of blowing iron oxide powder, fine iron ore, dust, pulverized coal, oil, tar, coke, plastic, and the like from the blower branch pipe has been performed. ing. Conventionally, these blows are performed with a metal tube such as SUS, and can be pulled out and taken out when inserting or removing the tuyere ring, removing castable fragments, or performing repair and inspection work. Had a structure.

[0003]

However, in a lance that blows iron oxide powder, fine iron ore, dust, pulverized coal, oil, tar, coke, plastic, etc. from the above-described conventional blast furnace blast tube, the lance, such as SUS, is used. In metal tubes,
Since the tip is exposed to high-temperature, high-pressure air, the members are deteriorated in a short period of time, and are worn due to the powders flowing at a high speed, so that such operations cannot be continued.

In order to solve such a disadvantage, there has been proposed a blast furnace lance 5 in which the tip 6 is made of ceramics as shown in FIG. Here, 7 is a furnace shell,
8 is a tuyere and 9 is a blowpipe. With this configuration, the heat resistance and the wear resistance are improved, but when the blast furnace lance 5 is pulled out after the blowing is stopped, the blast furnace is exposed to a high temperature. In some cases, it was damaged. Further, when the lance 5 for the blast furnace is pulled out, there is a drawback that the tip 6 made of ceramics cannot be pulled out linearly and comes into contact with a peripheral wall surface or the like and breaks.

SUMMARY OF THE INVENTION An object of the present invention is to provide a blast furnace lance having a tip tube which is completely retracted and stored in a guide pipe along a guide member. An object of the present invention is to provide a lance for a blast furnace that can withstand heat shock and does not crack when it comes into contact with surrounding walls and the like.

[0006]

A lance for a blast furnace according to the present invention is a lance for a blast furnace for injecting pulverized coal, dust, liquid fuel, etc. into a tuyere for a blast furnace. It is configured to be able to be evacuated and stored from the pipeline.
Further, the tip tube moves along a guide member. Further, the guide member is a guide tube.

As described above, since the lance for a blast furnace according to the present invention is configured so that the tip tube can be linearly stored in the guide tube by the drive mechanism, the lance breaks due to heat shock or breaks against the wall surface during the pulling operation. I have nothing to do.

[0008]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an overall vertical sectional view showing a blower branch pipe using the blast furnace lance of the present invention, FIG. 2 is a sectional view of a main part showing a relationship between the blast furnace lance and the blower branch pipe, and FIG. FIG. 2 is a cross-sectional view showing the overall configuration of the embodiment.

Here, the blower branch pipe 10 is connected to an annular pipe 11.
And a bend pipe 12, a vertical pipe 13, a bend piece 14, a blow pipe 15 and the like connected thereto, and are connected to a tuyere 18 of a blast furnace. Further, a refractory heat insulating material 16 is adhered to the inner peripheral surface of the conduit. And
The blast furnace lance 17 of the present invention is attached to a part of the blow pipe 15. Further, a fire-resistant and heat-insulating material 36 is provided at the inlet nozzle of the blow pipe 15 so that the stored front end pipe 19 is not rapidly cooled.

As shown in FIG. 2, a lance 1 for a blast furnace according to the present invention.
7 is a blow pipe 15 near the tip of the blow pipe 15.
Is mounted at a predetermined angle θ with respect to the center line C. The lance 17 for a blast furnace includes a tip tube 19 made of ceramics, a fixed tube portion 20 for movably fixing the tip tube 19, and a guide tube 21 for slidably supporting the fixed tube portion 20 in the axial direction. And a drive mechanism 22 for driving the fixed tube section 20.

The distal tube 19 is entirely made of ceramics, and has a flange 19a at the base end. Ceramics include, for example, silicon carbide, silicon nitride,
It is mainly made of Zyalloy, zirconia, alumina or the like. Ceramics have heat resistance and wear resistance.

The fixed tube portion 20 has a support tube 23 at the tip end which is thick and supports the outer periphery of the tip tube 19. Inside the fixed tube portion 20, a conduit 24 that presses the flange 19a of the tip tube 19 and has a tube portion 24a that communicates with a tube portion 19b formed on the tip tube 19 is provided. A flange 24b is formed at the rear end of the conduit 24, and corresponds to the flange 20b formed at the rear end of the fixed tube portion 20 with a predetermined gap. Therefore, both flanges 2
By tightening the bolts and nuts 0b and 24b, the flange 19a of the distal end pipe 19 can be pressed against the support cylinder 23 and securely held. Further, since the inner diameter of the support tube 23 is substantially equal to the outer diameter of the distal end tube 19, the distal end tube 19 does not contact the inner periphery of the guide tube 21.

An end of the flange 20b is extended and a female screw 26 is fixed. This female screw 26 has
The male screw 27 is screwed. This female screw 26 and male screw 2
Numeral 7 forms a part of the drive mechanism 22 and slides the fixed tube portion 20 in the axial direction together with the distal end tube 19.

The fixed pipe section 20 is slidably inserted into the guide pipe 21, and a gland packing 28 is provided at the rear end to seal. The tip tube 19 has a support cylinder 23 having an outer diameter substantially equal to the inner diameter of the guide tube 21.
, And a constant distance from the inner circumference of the guide tube 21 can be maintained. Further, a gas seal pipe 30 is provided in a gap 29 between the fixed pipe section 20 and the guide pipe 21.

The drive mechanism 22 includes a handle 31, a bevel gear 32 directly connected to the handle 31, a bevel gear 33 meshed with the bevel gear 32, a male screw 27 directly connected to the bevel gear 33, and the like. The handle 31 and the bevel gears 32 and 33 are rotatably supported by a support member 34 extending from the guide tube 21, and the unthreaded portion of the male screw 27 is similarly extended from the guide tube 21. It is rotatably supported by the provided support member 35. Further, the threaded portion of the male screw 27 is screwed with the female screw 26 fixed to a part of the flange extending from the fixed tube portion 20 as described above.
Therefore, by turning the handle 31, the tip tube 19
Can be moved linearly together with the fixed tube portion 20, and there is no risk of breaking by contacting the inner wall of the tuyere 18 and other members.

As described above, in the lance for a blast furnace according to the present invention, the tip tube 19 is linearly retracted and stored in the guide tube 21 by the driving mechanism 22, so that the heated tip tube 19 of ceramics or the like is tuyere 18 or blown. No damage is caused by hitting the inner wall of the pipe 15. Further, since the heated distal end pipe 19 is stored in the guide pipe 21 and the refractory heat insulating material 36 is disposed at the entrance nozzle portion, it is gradually cooled without being rapidly cooled. Cracks and the like can be prevented from occurring.

The use of the blast furnace lance configured as described above will be described. First, in the case where fine iron ore, dust, pulverized coal, etc. are blown into the blower branch pipe line 10, the driving mechanism 2 is used.
By operating the handle 2 with the handle 31, the tip tube 19 is projected into the duct. The projecting position of the tip tube 19 is determined in consideration of combustion efficiency, reduction reaction, and the like. In this embodiment, since the tip tube 19 is moved linearly by the drive mechanism 22, it does not hit the tuyere 18 or the inner wall of the blow pipe 15 and is not damaged.

When the tuyere ring is to be attached or detached during a calm period, or when the dropped heat-resistant castable is dropped into the furnace, the tip tube 19 is in the way. Then, the distal end pipe 19 is stored in the guide pipe 21, and is completely retracted from the ventilation branch pipe line 10. High temperature ceramics guide tube 2
It is stored in the storage unit 1 and is not exposed to cold air, and there is no possibility of receiving a heat shock.

In the above embodiment, the case where the guide member is a guide tube has been described, but the guide member may be a guide rail. The distal end pipe 19 may be moved and stored linearly along the guide rail. It should be noted that the present invention is not limited to the above embodiments, and various design changes can be made based on the technical idea of the present invention.

[0020]

As described above in detail, the blast furnace lance according to the present invention is a blast furnace lance for injecting pulverized coal, dust, liquid fuel, etc. into the blast furnace tuyere. Since the tube is configured to be retractable and retractable from the ventilation branch pipe line, the one used in the high-temperature atmosphere is stored in the guide tube and gradually cooled, so that the tip tube of the lance does not break due to heat shock .

Further, since the tip tube of the lance for the blast furnace moves along the guide member, the tip tube made of ceramic is linearly moved by a drive mechanism in the vicinity of the tuyere when repairing heat-resistant materials or the like. It can be moved back and retracted and stored in the guide pipe, and there is no possibility that the tip tube will be damaged by hitting the tuyere or the inner wall of the blow pipe.

[Brief description of the drawings]

FIG. 1 is an overall vertical sectional view showing a blower branch pipe in which a lance for a blast furnace of the present invention is used.

FIG. 2 is a sectional view of a main part showing a relationship between the blast furnace lance and a blower branch pipe.

FIG. 3 is a cross-sectional view showing the entire configuration of the blast furnace lance.

FIG. 4 is a sectional view of a main part showing an example of a conventional lance for a blast furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Ventilation branch pipe line 11 Annular pipe 12 Upper bend pipe 13 Vertical pipe 14 Bend piece 15 Blow pipe 16 Fireproof heat insulating material 17 Lance for blast furnace 18 Tuyere 19 Tip pipe 19a Flange 19b Pipe section 20 Fixed pipe section 20b Flange 21 Guide pipe 22 Drive mechanism 23 Support cylinder 24 Conduit 24a Pipe part 24b Flange 25 Bolt / Nut 26 Female screw 27 Male screw 28 Gland packing 29 Void 30 Piping 31 Handle 32,33 Bevel gear 34 Support member 35 Support member 36 Fire resistant heat insulating material

Claims (4)

[Claims] 1. A blast furnace lance for injecting pulverized coal, dust, liquid fuel or the like into a blast furnace tuyere, wherein a tip tube of the blast furnace lance is configured to be retractable and retractable from a ventilation branch pipe line. Blast furnace lance. 2. The lance for a blast furnace according to claim 2, wherein the tip tube moves along a guide member. 3. The blast furnace lance according to claim 1, wherein said guide member is a guide tube. 4. The lance for a blast furnace according to claim 1, wherein the guide member is a guide rail.