KR19980056421U - Pulverized coal injection device of blast furnace - Google Patents

Abstract

The present invention relates to a PULVERIZED COAL INJECTION LANCE of a steel mill. More specifically, the feed pipe tip is deformed by high temperature in the furnace so that the powdered coal feed pipe tip of the pulverized coal injection device can be detachably screwed. Or it is designed to devise an effect such as easy to replace the end of the transfer pipe when the deformation is made, and to reduce the work time and reduce the re-cost according to the extension of the life of the pulverized coal blowing device.

Description

Pulverized coal injection device of blast furnace

1 is an overall schematic view of a furnace in which the device of the present invention is installed.

2 is a cross-sectional view of the blow pipe (PPE) in which the device of the present invention is installed

3 is a longitudinal cross-sectional view of the device of the present invention

4 is an enlarged cross-sectional view of the main part of the device

Explanation of symbols on the main parts of the drawings

1 furnace 2: pulverized coal supply line

3: blower 4: blow pipe

5: burner guide 10: pulverized coal blowing device

11: one side pipe 11a: the other side pipe

12: flange 13: socket

14: pulverized coal injection pipe 15: female thread

15a: Male thread 16: Taper portion

17: Pulverized coal injection end pipe 18: Pulverized coal discharge port

The present invention relates to a PULVERIZED COAL INJECTION LANCE of a steel mill. More specifically, the feed pipe tip is deformed by high temperature in the furnace so that the powdered coal feed pipe tip of the pulverized coal injection device can be detachably screwed. In addition, it is easy to replace the transfer pipe tip when it is deformed, and it is designed to save the work time and reduce the re-costs due to the extension of the life of the pulverized coal blowing device. Pulverized coal finely pulverized low-cost coking instead of expensive coke used as fuel for molten iron manufacturing is an auxiliary fuel that blows and burns in a blast furnace, which requires durability and lifespan of equipment components according to large blowing. However, the pulverized coal blowing operation blows the pulverized coal transported through the pipeline from the crusher into the burner blowing guide portion of the blow pipe as the blower pipe, and burns the conventional blow pipe burner blowing guide portion with a semi-conical shape in the cylindrical blow pipe. It is constructed by joining to one side of blow pipe. The shape of the blow pipe and guide, which is a high temperature refractory material, is constructed and constructed, is maintained by the round pipe of the caliber that can blow the pulverized coal injection device. It is installed to be in contact with the blow passage (nozzle) of the inner circumference of the pipe, and is blown through the blow passage to burn the pulverized coal blown into the pulverized coal blowing device by the high temperature hot air of about 1250 ℃, and the pipe tip of the pulverized coal blowing device is Easily deformed or Dissolved and abrasion is caused by partial burning and cracking of refractories, resulting in increased heat generation inside and outside the guide, leading to damage to the blow pipe itself. As it has to be disassembled and replaced, problems such as high cost and long time replacement work due to the occurrence of a break and replacement of the furnace have occurred.

Therefore, the present invention is designed to solve the above problems by easily dismantling only the tip of the blower pipe leading to the deformation in the long pulverized coal blowing device in order to solve the various problems as described above. When described in detail based on the accompanying drawings as follows.

FIG. 1 shows an overall schematic diagram of supplying hot and high-temperature hot air to pulverized coal and a plurality of blowers 3 through a pulverized coal supply line 2 to a blast furnace 1 of a steel mill, and FIG. 2 is a blow in which the device of the present invention is installed. 3 is a longitudinal cross-sectional view of the device of the present invention, and FIG. 4 is an enlarged cross-sectional view of the main part of the device of the present invention, and FIG. 4 is a blow pipe 4 known under the main wall of the furnace 1 as shown in FIG. In the blow pipe 4 to form a burner guide 5 having a predetermined angle of inclination on one side of the blow pipe 4 and to install the pulverized coal blowing device 10 penetrating the burner guide 5. 10) is welded by welding the flange 12 and the socket 13 to the end of the circular pipe 11 and the other pipe (11a) of a constant length, but the pulverized coal injection pipe 14 is inserted into the inner peripheral surface of one pipe (11), The pulverized coal Pulverized coal injection tip having a tapered portion 16 whose diameter is reduced in the direction in which the midway portion is fed in the direction in which the middle portion is supplied to the inner circumferential surface of the other pipe 11a facing the pipe 11, and the female screw 15 is disposed on the inner circumferential surface of the mouth pipe 14 end. The pulverized coal injecting device is constituted by cutting the male screw 15a on one side of the pipe 17 so as to be combined with the female screw 15 cut in the inner circumferential surface of the distal end of the pulverized coal injecting pipe 14. In the figure, reference numeral 18 is a discharge port through which pulverized coal is discharged.

Referring to the operating state of the present invention configured as described above for a long time pulverized coal injection device 10 in a state in which the pulverized coal injection device 10 implemented in accordance with the present invention is mounted on the burner guide 5 installed on one side of the blow pipe 4. Pulverized coal discharge port 18 of the pulverized coal injection end pipe 17 while the pulverized coal discharge port 18 is deformed due to high heat. Since the internal thread 15a and the external thread 15a of the pulverized coal injection end pipe 17 are separated, it is possible to replace only the pulverized coal end pipe 17 so that the short work time and the entire pulverized coal injection device do not need to be replaced, thereby reducing the replacement cost. Therefore, there is an effect that can increase the use efficiency of the furnace.

Claims (1)

Pulverized coal injector installed through the blower guide 5 by extending the blow pipe 4 under the main wall of the ironworks furnace 1 and forming a burner guide 5 having a constant inclination angle on one side of the blow pipe 4. In (10), The pulverized coal injection device 10 is divided into a pipe 11 and a pipe 11a of a constant length, welded with a flange 12 and a socket 13 at the front end thereof, and a female screw at the distal end of the inner circumferential surface of the pipe 11. Pulverized coal injection of the blast furnace by inserting the pulverized coal injection pipe 14 which (15) was cut out, and inserting the male screw 15a at the end of the other pulverized coal injection end pipe 11a, and screwing this female screw 15 and the male screw 15a. Device