JP2000313908A - Blasting tuyere - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blasting tuyere having two-piece structure and easily manufactured. SOLUTION: This blasting tuyere has a tuyere body 31 provided with a first water flowing path which is formed between an inner cylinder part 16 and an outer cylinder part 17 and arranged with a water supplying hole at the rear end outside part 18, at the latter half part and a second water flowing path 14 which is connected with the inner cylinder part 16 extended to the front side and with a parting wall 23 of the first water flowing path at the base end part and formed with a middle cylinder part 27 having a spiral parting part 30 at the outside and communicated with the first water flowing path, and an outside cover 32 formed of a third water flowing path 15 which is welded with an outer cylinder part 17 formed at the latter half part in this rear end part and communicated with the second water flowing path 14 at the interval with the middle cylinder part 27 by abutting on the outer end of the spiral parting part 30 in this inside, and welding the tip part smoothly bending inward at the front part 34 with the inner cylinder part 16. Further, a fourth water flowing path 15a communicated with the third water flowing path 15, is provided with the tuyere body 31 and a drainage hole 20 thereof is provided with the rear end outer side part 18 of the tuyere body 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a tuyere of a blast furnace or the like, and more particularly, to an assembly structure of a tuyere.

[0002]

2. Description of the Related Art A blowing tuyere used in a blast furnace or the like has hot air of about 1200 degrees passing through the inside of its tip at a speed of about 500 meters per second, and the outside is heated to a high temperature of about 1700 to 1800 degrees inside the furnace. Because it is easily eroded. For this reason, the cooling water is forcibly circulated through the inside of the tuyere, and the circulation speed of the cooling water is increased toward the tip of the tuyere, thereby improving the erosion resistance. As shown in FIG. 5, the conventionally used blower tuyere 70 has a water supply port 71 at the rear end outside.
A first water passage 72 communicating with the first water passage 72 is provided in a hollow annular base side water passage chamber 73 formed by a rear portion of the inner cylinder 85, an outer cylinder 86, a rear wall 85a, and a partition wall 86a. The main body 75 includes a base-side water passage 73 and a front-side inner wall 74 that is a front-side portion of an inner cylinder 85 that extends to the front end of the blow tuyere 70. Front inner wall 7
A cylindrical middle tube 76 is fitted on the outside of the tube 4, thereby providing a certain space between the front inner wall portion 74 and the middle tube 76 to form a second water passage 77. Also, the middle cylinder 7
A spiral partition 78 is provided on the outside of 6. A substantially cylindrical outer wall portion 79 is fitted on the outer side of the middle cylinder 76 such that the inner surface thereof is brought into contact with the outer end of the spiral partition 78, and the spiral partition 78 and the inner surface of the outer wall portion 79 are fitted. A third water passage 80 is formed by the space surrounded by.

The base end 81 of the outer wall 79 is welded to the front end of the outer cylinder 86 over the entire circumference. In addition, the outer wall 79
The front part 83 has a shape curved toward the inside of the cylindrical outer wall part 79, and the front end part 82 of the outer wall part 79 extends all around the front end part of the front inner wall part 74 of the inner cylinder 85. Is welded over. The inside of the curved front part 83 is the front part 8.
3. A tuyere tip chamber 84 which is surrounded by the front inner wall portion 74 and the spiral partition 78 and communicates with the second water passage 77 is formed. Further, a fourth water passage (not shown) communicating with the third water passage 80 is provided on an outer peripheral portion of the base side water passage chamber 73.
A drain port (not shown) is provided on the outside of the rear end of the base-side water passage chamber 73 in parallel with the axial direction 0. Water inlet 7
The cooling water flowing in from 1 flows in the first water passage 72 in the circumferential direction, and the second water passage 77 communicates with the first water passage 72.
The water passes through the tuyere tip chamber 84, the third water passage 80, and the fourth water passage in a spiral shape and flows out from the drain port. Since the cross-sectional area of the third water passage 80 is smaller than that of the first water passage 72 and the second water passage 77, the flow velocity of the cooling water passing outside the front end of the blowing tuyere 70 can be increased. Was. However, in order to increase the flow velocity outside the front end portion of the blowing tuyere 70, it is necessary to reduce the cross-sectional area of the flow path, so that the internal shape is complicated. For this reason, when the blowing tuyere 70 is cast-formed, it has been divided into three parts: a main body 75, a middle cylinder 76, and an outer wall 79.

[0004]

However, since the conventional blow tuyere 70 is divided into three pieces and cast and formed, it is necessary to perform a finishing process on each piece and then perform welding and fixing. In addition, the finishing process takes a long time, and the production cost by casting is also increasing. In particular, since the middle cylinder 76 is required to be attached by sliding between the two members of the main body 75 and the outer wall 79 and not to leak water to the adjacent water passage, particularly high finishing accuracy is required. Manufacturing took time. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a blowing tuyere having a two-piece structure and easy manufacture.

[0005]

According to the present invention, there is provided a blower tuyere according to the present invention, which has a connection port for a blower branch pipe at the center of a rear end thereof, and blows hot air from the connected blower branch pipe into the inside of a blast furnace. A first water passage formed between the inner cylinder portion and the outer cylinder portion and provided with a water supply port at the rear end outside portion in the rear half, and the inner cylinder portion extending to the front side And a tuyere whose base end is connected to a partition wall of the first water passage, is formed by a middle cylinder portion having a spiral partition portion on the outside, and has a second water passage communicating with the first water passage. A main body and a rear end portion are welded to an outer cylinder portion formed in the rear half, and an inner side thereof is in contact with an outer end of the spiral partition portion and communicates with the second water passage between the middle cylinder portion. To form a third water channel,
Moreover, the front part has an outer cover that is smoothly bent inward and the tip part is welded to the inner cylinder part, and the tuyere body further includes a fourth water passage communicating with the third water passage. A drain port of the fourth water passage is provided on a rear end outer portion of the tuyere main body. The number of parts is reduced by dividing the blow tuyere into two pieces, the tuyere body and the outer cover,
The division of the flow path is simplified, and the processing and assembly of the parts are facilitated.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.

As shown in FIG. 1, a blow tuyere 10 according to an embodiment of the present invention has a connection port 12 at a rear end center portion 11 with which a blow pipe tip of a blow branch pipe (not shown) abuts. A cylindrical member for blowing hot air into the blast furnace from a blower branch pipe connected thereto, the first water passage 13 being formed on a base side (rear side) so that cooling water can be circulated therein;
A second water passage 14 formed inside the front part, a third water passage 15 formed outside the second water passage 14, and a fourth water passage formed so as to cross the first water passage 13. Water passage 15a
Are formed so as to communicate with each other. Hereinafter, this will be described in detail with reference to FIGS. As shown in FIGS.
The first water passage 13 is provided with a water supply port 19 for supplying cooling water to a rear end outer portion 18 of the blow tuyere 10, between the inner tubular portion 16 and the outer tubular portion 17, and It is provided in the rear half. Further, a fourth water passage 1 for discharging the circulated cooling water is provided at a position not overlapping with the water supply port 19 of the rear end outer portion 18.
A drain port 20 of 5a is provided, and a water supply pipe 21 and a drain pipe 22 are connected to the water supply port 19 and the drain port 20, respectively.

[0008] A partition wall 23 is provided at the front end of the first water passage 13, and a rear wall 24 a is provided at the rear end of the inner cylinder 16 and the outer cylinder 17. As described above, the first water passage 13 includes the inner cylinder 16, the outer cylinder 17, the partition wall 23,
And a hollow annular rear water passage 25 formed by the rear wall 24a. In addition, rear water room 2
5, a tube wall portion 17 a is provided on both sides of the outer cylindrical portion 17 in parallel with the axial direction of the outer cylindrical portion 25, thereby providing a fourth wall having a substantially arc-shaped cross section. Forming a front end of the water passage 15a in communication with the third water passage 15;
The rear end is connected to the drain 20.

The diameter of the inner cylinder 16 is reduced to the front side of the partition wall 23, and the front inner cylinder 26, which is the front side of the inner cylinder 16, extends to the front side of the tuyere 10. Further, a base end portion 24 is connected to the partition wall 23 outside the front inner cylinder portion 26, and a middle cylinder portion 27 is provided with a gap outside the front inner cylinder portion 26. The second water passage 14 is formed between the middle cylindrical portions 27. The second water passage 14 communicates with the first water passage 13 through an opening 40 formed in the partition wall 23. A front wall 28 is provided at the front end of the inner cylinder 16 and the middle cylinder 27. As described above, the second water passage 14 includes the front inner cylindrical portion 26 and the middle cylindrical portion 2.
7, a partition wall 23 and a front wall 28 are formed inside a hollow annular front water passage chamber 29. Further, a plurality of holes 41 having a diameter of about 20 mm are provided in the partition wall 23 to facilitate casting of the front water passage chamber 29. As described above, the tuyere main body 31 is integrally formed by the rear water passage chamber 25 and the front water passage chamber 29 each having the first water passage 13 and the second water passage 14 therein.
In addition, a plate-shaped spiral partition 30 is provided outside the middle cylindrical portion 27 of the front water passage chamber 29. Also, the partition wall 23
The front wall 28 is smoothly connected to the front wall 28 by an oblique wall 28a, thereby improving the flow of the cooling water and reducing the pressure loss.

A spiral partition 30 is provided outside the middle cylinder 27.
The outer cover 32 is provided so as to cover the outer cover. The rear end portion 33 of the outer cover 32 is welded and fixed to the front end of the outer tubular portion 17 formed in the rear half of the blower tuyere 10 (that is, the tuyere main body 31). 34 is smoothly bent inward, and its front end 35 is connected to the front inner cylindrical portion 26.
It is fixed to the front end by welding. Further, the inside of the outer cover 32 abuts on the outer end of the spiral partition 30 of the middle cylinder portion 27, and the third water passage 1 is provided between the outer cover 32 and the middle cylinder portion 27.
5 are formed. The third water passage 15 includes the spiral partition 3
The cross-sectional area is gradually reduced as it moves forward by 0, and its leading end communicates with the second water passage 14 and its rear end communicates with the fourth water passage 15a. Since the third water passage 15 formed outside the front part of the blowing tuyere 10 which is easily melted has a small flow passage cross-sectional area, the speed of the cooling water passing therethrough can be increased.

Next, the flow path of the cooling water will be described. As shown in FIG. 3, the cooling water sent from the water supply port 19 is:
The water flows in the direction of the arrow (circumferential direction) by the guide plate 42 having an arc-shaped cross section provided forward of the water supply port 19 in the flow direction. In addition,
Except for the guide plate 42, water can be guided by a pipe. Then, the air flows about one round in the circumferential direction of the blow tuyere 10 along the first water passage 13, and flows into the second water passage 14 from an opening 40 provided radially inside the partition wall 23.
Further, the cooling water, which has also made a round of the second water passage 14 in the circumferential direction, flows into a portion provided at the forefront of the third water passage 15 of the blowing tuyere 10 and has a minimum cross-sectional area, and flows at a high speed. .
Then, as shown in FIG. 4, the water passes through the third water passage 15 and the fourth water passage 15 a in order, and is drained from the drain pipe 22 attached to the drain port 20. Second and third water passages 14, 15
A gentle curve is provided at the connecting portion of the cooling water, and the pressure loss of the cooling water passing at high speed is reduced. Since the portion formed inside the curved front portion 34 of the outer cover 32 of the third water passage 15 has the smallest cross-sectional area,
The flow velocity is the highest, and the highest pressure is applied to the entrance of the third water passage 15. Conventionally, since the middle cylinder portion was cast as a separate part, the respective ends of the middle cylinder portion with respect to the partition wall and the front wall are joined by sliding, and the second water passage and the third water passage having different water pressures are provided. Although there was a possibility that water would flow between the water passages and affect the flow rate of the cooling water, in the present embodiment, as shown in FIG. 1, the end portions 43 and 44 with respect to the partition wall 23 and the front wall 28. Is formed integrally as a part of the tuyere main body 31, so that water is not generated between the second water passage 14 and the third water passage 15, and a stable flow velocity can be maintained. Can,
In addition, the cooling efficiency is improved, so that the output of the cooling water circulation actuator can be reduced.

Next, a method of manufacturing the blow tuyere 10 will be described. First, the tuyere main body 31 and the outer cover 32 are formed by casting, respectively. The partition wall 23 connecting the rear water passage chamber 25 and the front water passage chamber 29 is provided with a plurality of holes 41, so that the core forming the front water passage chamber 29 is supported and sand is reliably removed. It can be carried out. Next, the outer end surface of the spiral partition 30 of the tuyere main body 31 and the inner side surface of the outer cover 32 that are in contact with each other are subjected to finishing, and the outer cover 32 is fitted into the tuyere main body 31 to form the third water passage 15. I do. Then, the front end 35 of the outer cover 32 and the rear end 3
3 are fixed to the front end portion of the front inner cylinder portion 26 and the front end portion of the outer cylinder portion 17 by welding, respectively. Then, after checking for defective products by an airtightness test of the welded portion and a pressure loss test of the flow path, the blow tuyere 10 is completed. Since the casting is performed by dividing into two pieces, compared with the case where the casting is divided into three pieces, the number of rubbed surfaces is reduced and the production can be easily performed.

[0013]

According to the first aspect of the present invention, since the tuyere is formed in a two-piece structure of the tuyere main body and the outer cover, the number of parts is reduced, the structure is simplified, the assembling is facilitated, and the manufacturing period is reduced. And product cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a blowing tuyere according to an embodiment of the present invention.

FIG. 2 is a front sectional view of the blowing tuyere.

FIG. 3 is an explanatory diagram showing an internal structure of a first water passage and a second water passage of the blow tuyere.

FIG. 4 is an explanatory diagram showing an internal structure of a third water passage and a fourth water passage of the blower tuyere.

FIG. 5 is a side sectional view of a blower tuyere according to a conventional example.

[Explanation of symbols]

10: blow tuyere, 11: rear end center, 12: connection port, 1
3: 1st waterway, 14: 2nd waterway, 15: 3rd waterway, 15a: 4th waterway, 16: inner cylinder, 17: outer cylinder, 17a, pipe wall, 18: rear end Outer part, 19: water inlet, 20: drain, 21: water pipe, 22: drain pipe, 2
3: partition wall, 24: base end, 24a: rear wall, 25:
Rear water chamber, 26: front inner cylinder, 27: middle cylinder, 28:
Front wall, 28a: Slanted wall, 29: Front water passage, 30: Spiral partition, 31: Tuyere body, 32: Outer cover, 3
3: rear end, 34: front, 35: front, 40: opening,
41: hole, 42: guide plate, 43, 44: end

Claims (1)

[Claims] 1. A connecting port for a blower branch pipe is provided at a central portion of a rear end,
A first water passage formed between the inner tube portion and the outer tube portion, and provided with a water supply port on the outer rear end portion, in a cylindrical blow tuyere for blowing hot air from the connected blower branch pipe into the blast furnace. Prepared in the rear half, the inner cylinder portion extended to the front side, and the base end thereof is connected to the partition wall of the first water passage, formed by a middle cylinder portion having a spiral partition portion on the outside, A tuyere body provided with a second water passage communicating with one water passage, and a rear end portion welded to an outer cylinder portion formed in the rear half, and an inner portion thereof is in contact with an outer end of the spiral partition portion. Forming a third water passage communicating with the second water passage between the middle cylinder portion and an outer cover whose front portion is smoothly bent inward and whose front portion is welded to the inner cylinder portion; The tuyere body further includes a fourth water passage that communicates with the third water passage, and a drain port of the fourth water passage has a front end. Blowing tuyere, characterized in that provided in the rear outer portion of the tuyere body.