KR100418981B1 - pulverized coal injection lance location control apparatus - Google Patents

Abstract

The present invention relates to a pulverized coal blowing lance position adjusting device for preventing hot air (about 1200 degrees) inside the blast furnace from being blown out to a lance setting flange. A cooling tube (COOLING TUBE) 111 threaded portion 107 is processed, the holder (HOLDER) junction portion 101 of the structure to which the cooling tube 111 can be fastened by a coater (113) is formed, Sealing closing 102a is assembled to form two hot air blocking chambers 104, and another sealing closing 102b is mounted between the one hot air blocking chambers 103, and the hot air blocking two chambers 104 and the hot air blocking unit 1 are formed. At the end of the hot air blocking 1 chamber 103, a sealing closure 102c forms a boundary while blocking the hot air inside the blast furnace, and the outer side of the cooling tube 111 is formed on one side. Thus, it has a structure of forming two chambers 104 and one chamber 103 to block hot air, The pulverized coal injection lance has been a structure that can not move at all, and the lance tip is moved freely inside the wind hole through the pulverized coal injection lance adjustment device to adjust the center of the lance tip transformed into red light, and to remove the solid matter generated during the pulverized coal injection. This makes it possible to stably inject pulverized coal into the blast furnace, and to contribute to cost reduction and prevention of wear and tear damage caused by fine dust and stabilization of blast furnace.

Description

Pulverized coal injection lance location control apparatus

The present invention relates to a pulverized coal blowing lance position adjustment device for adjusting the tip position of the pulverized coal blowing lance installed in the blowpipe of the blast furnace, and the lance setting flange has hot air (about 1200 degrees) inside the blast furnace. The present invention relates to a pulverized coal blown lance position adjusting device which does not eject to the outside.

The pulverized coal blowing operation carried out at the time of the blast furnace operation is an oxygen enrichment operation to locally increase the oxygen concentration at the site where the pulverized coal is blown in the tip of the tuyere 30 to completely burn the pulverized coal injected.

When charging iron ore, coke and other auxiliary materials into the blast furnace 40, pulverized coal is blown to reduce the amount of coke that is blown into the blast furnace 40 by a high-temperature hot air (about 1200 cities) at the bottom. Blown.

To this end, a pulverized coal injection lance 10 composed of a double pipe at a blow pipe 20 and a blowhole 30 for blowing pulverized coal and hot air into the blast furnace 40 is blow pipe 20 to blow pulverized coal. In this case, fine coal is transported using nitrogen as a carrier gas, and oxygen gas (cold wind) is supplied to the outer tube to cool the pulverized coal injection lance 10 and used as a reaction gas for burning pulverized coal.

Referring to the structure of the pulverized coal injection lance in detail, as shown in FIG. 1, the pulverized coal injection lance 10 is assembled with the LANCE SETTING flange 110 to the blow pipe 20 by bolts, and the cooling tube 111 is coated by the COTTER 113. It is coupled to the LANCE SETTING (110) flange and afterwards the pulverized coal injection lance 112 is fastened with bolts to the cooling tube 111. At the rear end, a manual valve and other end pipes are connected to inject pulverized coal into this place. .

For reference, 1 Kg / Ton of pulverized coal has a cost reduction effect of about 24 won and current blast furnaces inject about 150 kg / Ton of pulverized coal. However, the pulverized coal blown lance 10 assembled and assembled as shown in FIG. 2 has a structure in which rotation or adjustment work is not performed for adjusting the center of the lance 112 or removing the fixed substance due to hot wind backflow during operation. .

Therefore, in order to sufficiently cool the pulverized coal injection lance 10, the oxygen gas should be supplied smoothly, but when the check valve for preventing the reverse flow of oxygen gas is broken or the oxygen gas and the cold wind transfer hole are blocked by the reverse flow of pulverized coal, the oxygen gas is injected into the pulverized coal. It is not sufficiently supplied to the cooling tube 111 of the lance 10, in this case, the pulverized coal injection lance 10 is heated by hot air of about 1200C and deformation occurs due to its own weight.

The pulverized coal blown lance 10, which is red and bent, is struck down so that the injected pulverized coal and oxygen collide directly with the tuyere 30 so that the reaction of oxygen and pulverized coal is reduced to high heat near the tuyere 30 occurs. Blow ball 30 wear occurs and eventually the blow hole 30 is broken, and the pulverized coal solidifies at the lance tip 112 (presumed to be a fine combustion material) and thus does not produce a normal pulverized coal injection. In order to prevent such accidents, the end position of the pulverized coal injection lance is visually monitored and monitored for proper time. If it is determined that the pulverized coal injection state is poor due to the deformation of the tip position of the injection lance, pre-injection is performed to prevent breakage of the tuyere 30. However, it is being replaced at the next water purification (refer to the blast furnace lance tip position management chart in Fig. 3). There is a problem that difficulty occurs.

Therefore, the present invention has been devised to solve the above-described problems, such as the center adjustment of the lance tip deformed to red glowing by moving the lance through the pulverized coal injection lance rotation device and the removal of solid matter generated during pulverized coal injection By making it possible to pulverize pulverized coal in the blast furnace stably, it aims to be able to contribute to the reduction of cost and wear damage caused by fine dust and to contribute to stabilization of blast furnace.

1 is a pulverized coal injection flow diagram of a blast furnace;

2 is a pulverized coal injection lance configuration diagram.

Figure 3 is a lance tip position management chart of the blast furnace tuyere.

Figure 4 is a perspective view of the pulverized coal injection lance position adjusting apparatus according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: pulverized coal injection lance set 20: blowpipe 30: air balloon

100: Pulverized coal injection lance position adjusting device 101: Holder joint

102: sealing closed 103: hot air cut off 2 rooms 104: hot air cut off 1 room

105: AIR supply PILOT LINE 107: COOLING TUBE screw

110: LANCE SETTING flange 111: COOLING TUBE 112: Pulverized coal injection lance tip

113: COTTER

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Embodiment of the present invention pulverized coal injection lance position adjusting device,

A cooling tube (COOLING TUBE) 111 threaded portion 107 is processed at the distal end of the pulverized coal injection lance adjustment device 100, and the cooling tube 111 can be fastened with a coater (113). The holder (HOLDER) joining portion 101 is formed, the sealing closure 102a is assembled to form a hot wind shield 2 chamber 104, and another sealing closure 102b between the hot air shield 1 chamber 103 It is mounted and forms a boundary between the two hot air blocking rooms 104 and one hot air blocking room 103, and at the end of the hot air blocking one room 103, a sealing closure 102c blocks the hot air inside the blast furnace to form a boundary. Preferably, the cooling tube 111 has a structure in which the hot air barrier 2 chamber 104 and the first chamber 103 are formed on one side of the cooling tube 111.

Figure 4 is a perspective view of the pulverized coal injection lance position adjusting apparatus according to the present invention, when described with reference to it as follows.

When removing the existing LANCE SETTING flange 110 and fastening the pulverized coal blown lance position adjusting device 100 as shown in FIG. 4, the pulverized coal blown off is interrupted due to the removal of the front end fixture by the rotation of the lance 10 and the sagging of the lance. It is designed to prevent blowout by rotating the sea lance.

COOLING TUBE thread part 107 is machined at the front end inside the pulverized coal injection lance adjusting device 100, and the thickness of the thread is processed to 5 mm and the thread thickness is 2 mm. COOLING TUBE 111 is fastened to the COTTER 113. The holder (HOLDER) joining portion 101 of the structure that can be formed is formed, and immediately after the sealing closure 102a is assembled, a hot air cut-off two chamber 103 is formed.

Then, there is another sealing closure 102b between the one hot air cutoff chamber 104 and forms a boundary between the two hot air cutoff chambers 103 and the one hot wind cutoff chamber 104, and finally one hot air cutoff chamber 104. At the end, the sealing closure 102c blocks the hot air inside the blast furnace 40 and forms a boundary, and forms two chambers 103 and one chamber 104 to block hot air with the outer surface of the cooling tube 111 as one side. It is a structure in which a pilot line 105 for supplying air to the hot air cut rooms 2 and 103 and the room 104 is processed.

The present invention configured as described above is a method for resolving the pulverized coal blowing lance tip 112 position defect or the deformed lance 111a of FIG. Looking at the action, first open the air supply line valve 106 of the pulverized coal injection lance position control device (100).

At this time, the air of the same pressure is supplied to the hot wind blocking room 1 and the hot air blocking room 2 (103). First, the air entering the hot air blocking room 1 (104) is between the outer side of the cooling tube 111 and the sealing closing 102. Forces act in both directions of the blast furnace inner side and the hot air cut-off chamber 2 (103).

On the other hand, the air flows into the hot air cut-off two chambers 103 and blows into the holder portion 101, which is the joint between the hot air cut-off one chamber 104 and the COTTER 113 through the outer surface of the cooling tube 111 and the sealing closure 102. The force to act but the hot air cut room 2 103 and the hot air cut 1 room 104 balances the force so that the hot air does not flow back.

At this time, as in the method shown in Figure 4 by rotating the deformation lance 111a in a way to manage the pulverized coal injection lance 111b in a certain position in a fixed position by dismantling the fixed coater 113 of the cooling tube 111 Even after the COTTER 113 is called, the cooling tube thread 107 is machined so that the pulverized coal injection lance 10 can be freely rotated. The pitch tube is 5 mm and the thickness of the thread is 2 mm. The pulverized coal injection lance center can be adjusted to prevent pulverized coal injection.

As described above, according to the present invention, the pulverized coal injection lance installed at the blast furnace was not able to move at all during the pulverized coal injection lance position control device. It is possible to adjust the center and remove solid matters generated during the injection of pulverized coal, and to pulverize pulverized coal stably in the blast furnace, to prevent cost damage and to prevent wear and tear of the blast furnace due to fine powder and to stabilize the blast furnace.

Claims (1)

A cooling tube (COOLING TUBE) 111 threaded portion 107 is processed at the distal end of the pulverized coal injection lance adjustment device 100, and the cooling tube 111 can be fastened with a coater (113). The holder (HOLDER) joining portion 101 is formed, the sealing closure 102a is assembled to form a hot wind shield 2 chamber 104, and another sealing closure 102b between the hot air shield 1 chamber 103 It is mounted and forms a boundary between the two hot air blocking rooms 104 and one hot air blocking room 103, and at the end of the hot air blocking one room 103, a sealing closure 102c blocks the hot air inside the blast furnace to form a boundary. And a pulverized coal injection lance position adjusting device having a structure of forming two chambers (104) and one chamber (103) for blocking the hot air with one side of the cooling tube (111).