KR100762454B1 - Apparatus for controlling a gas distribution in a furnace - Google Patents

Abstract

The present invention relates to a gas distribution distribution control device in a furnace, and more particularly, an apparatus for lancing nitrogen gas in a furnace by being installed in a blast furnace furnace, the apparatus comprising: a first pipe passing through an outer surface of a furnace shell; A water supply pipe which is formed along the first pipe and is formed between the second pipe having an inlet at an outer end of the blast furnace and an outlet at an inner end of the blast furnace, and penetrated through one side of the first pipe; A drain pipe communicating with the other outer surface of the first pipe; One side of the fastening portion formed on the outer side surface of the first pipe is detachable and the other side includes a holder fixed to the core shell.

The present invention is to control the flow distribution of the gas distribution distribution in the furnace wall portion in the blast furnace furnace by adjusting the charging method or the blowing flow rate blown through the air vents, to suppress the fluctuations in the furnace in the furnace that may occur when the gas distribution distribution, Improve the productivity of blast furnace operations and stable blast furnace operations by stabilizing furnace walls and furnace facilities, such as minimizing the heat load on the furnace walls with few residual smoke and preventing the breakage of steel shells. It provides an effect that can be done.

Description

Furnace Furnace Gas Distribution Distribution Control Unit {APPARATUS FOR CONTROLLING A GAS DISTRIBUTION IN A FURNACE}

1 is a state diagram showing a conventional furnace gas distribution distribution,

Figure 2 is a furnace wall direct heat load control state diagram according to the present invention,

3 is a furnace wall portion local heat load control state diagram according to the present invention,

4 is a structural diagram of a furnace according to the present invention;

5 is a cross-sectional view of the nitrogen gas blowing lance in accordance with the present invention;

6 is a configuration diagram of a nitrogen gas blown lance in accordance with the present invention.

Explanation of symbols on the main parts of the drawings

10: stale shell 10a: red shell

10b: Breaking Sheath 10c: Backflow Flame in Furnace

11: cooling panel 11a: glowing cooling panel

11b: drainage temperature rise cooling panel 12: with existing furnace smoke

12a: remaining lead 12b: furnace wall local failure lead

12c: Wall Smoke and Erosion 13: Center of Furnace

13a: In-house central flow gas 13b: In-house central flow gas

13c: furnace furnace wall 13d: furnace furnace wall                 

14: Direct thermal load in the furnace 14a: Local heat load in the furnace

15: nitrogen gas 16: air vent

17a: Direct Heat Load Thermometer

17b: local furnace wall heat load thermometer

18: water-cooled nitrogen gas blowing device

18a: Water-cooled nitrogen gas blowing device for gas distribution distribution control of furnace wall

18b: horizontal nozzle

18c: Water-cooled nitrogen gas blowing device for cooling local wall load

18d: directional nozzle

20: nitrogen piping 20a: nitrogen gas transfer piping

20b: Flange 20c: CHECK VALVE

20d: AIR SOLENOID VALVE

22: cooling piping 22b: oval packing

22c: cooling water supply pipe 24: holder

26: fastening pin 26b: fastening pin

The present invention relates to a gas distribution distribution control device in a furnace, and more specifically, nitrogen gas (N2) in a lance by a situation in which a water-cooled lance (LANCE) is uniformly installed in a circumferential direction and a direct direction in a furnace shell. The present invention relates to an improved furnace distribution distribution of gas in the furnace, a gas distribution distribution control device in a furnace that can cool the remaining edges of the furnace wall, the cooling panel and the shell.

In order to make good use of the sensible heat and reducing ability of the gas of the blast furnace in which the cooling panel is inserted in the furnace wall during operation, it is preferable to make the gas distribution in the furnace uniform.

However, if the gas flow path is formed in only one place due to the distribution of the gas, the charging method of the charged material is changed or the blowing air flow blown into the furnace through the air vent 16 to control the gas distribution in the furnace. In this process, yellowing fluctuations frequently occur in the furnace, causing yellowing.

Although there is a difference in degree depending on the operating conditions, in general, the carbon dioxide is low and the temperature is high in the furnace center portion 13 of the cooling furnace blast furnace, and the carbon dioxide is high and the temperature is low in the cooling furnace blast furnace furnace wall portion 13c. There is a lot of gas flow in the.

In other words, in the cooling blast furnace, the gas distribution distribution based on the furnace core flow (13a) is an important operation condition for stable operation, but on the contrary, when there are a lot of gas flows in the furnace wall portion 13c, Existing furnace wall edge 12 is worn and the edge erosion (12c) is generated.

In the normal blast furnace without the remaining lead 12a, when the red heat 10a is generated and the heat is deepened, the gas and the flame 10c in the furnace are damaged by the iron break 10b due to the thermal stress of the steel 10. It is scattered to the outside and damage to the blast furnace body equipment and long-term recovery time for repairing it has a bad effect on the aging.

Another method is to improve the distribution of gas flow in the furnace by subtracting the blowing flow rate blown through the tuyere 16, but the gas flow path of the furnace wall portion 13c decreases when adjusting the blowing flow rate, thereby reducing the heat load of the furnace wall portion 13c. The temperature is lowered.

However, due to the decrease in the amount of air blown into the furnace, the gas flow is reduced throughout the furnace, causing deterioration of aging due to poor ventilation.

As another method, regardless of the heat deposit of the furnace wall 10d due to the flow of the furnace wall gas 13d, the furnace shell is thermally damaged by the local heat load 14a of the furnace wall due to the local soft breakage 12b. Gas and flame 10c are blown out of the furnace, causing equipment damage and deterioration.

For the same reason as above, when the temperature detection value of the thermometer mounted in the furnace exceeds the control value, water is sprayed on the furnace body to prevent the diffusion of the glowing portion and to prevent the breakage of the iron 10b.

When water is sprayed, it is suitable for preventing the diffusion of the glowing portion and for the temporary cooling of the glowing shell (10a), but thermal stress is generated in the shell (10) which does not maintain a certain temperature. Iron breakage 10b is caused.

In addition, the breakage caused by the cooling plate glowing 11a frequently occurs during the furnace wall heat load 14, and when the breakage occurs, the coolant is mixed into the furnace, causing deterioration and deterioration of the furnace.

So, in order to solve the various problems as described above, the refractories of castables are repaired on the furnace walls at regular intervals, but there are many problems in recovering the aging caused by long periods of absence of air, and frequent maintenance work due to premature removal of the sprayed refractory materials. There is this.

The present invention was created in view of the above-described problems of the prior art, and prevents damage to the old metal shell and the breakage of the cooling plate, and also introduces nitrogen gas into the furnace wall for a certain time, thereby reducing the distribution of gas. It controls smoothly to the central flow side and prevents breakage of the shell by the heat of the local flap and erosion of the cooling zone, and also cools the shell and the red cooling panel in the furnace by introducing inert nitrogen into the furnace. It is an object of the present invention to provide a gas distribution distribution control device in a furnace.

The above object of the present invention is an apparatus for lancing nitrogen gas in a furnace by being installed in a blast furnace furnace, the apparatus comprising: a first pipe passing through an outer surface of a furnace shell; A water supply pipe which is installed inside the first pipe and has an inflow portion formed at an outer end of the blast furnace; ; A drain pipe communicating with the other outer surface of the first pipe; One side is detachable to the fastening portion formed on the outer surface of the first pipe, and the other side is achieved by including a holder fixed to the steel cladding.

Hereinafter, a preferred embodiment according to the present invention will be described in more detail on the basis of the accompanying drawings.                     

Figure 2 is a furnace wall direct heat load control state diagram according to the invention, Figure 3 is a furnace wall portion local heat load control state diagram according to the invention, Figure 4 is a furnace configuration diagram according to the invention, Figure 5 is a nitrogen according to the invention 6 is a sectional view of a gas blowing lance, and FIG. 6 is a configuration diagram of a nitrogen gas blowing lance according to the present invention.

According to Figure 5, the structure of the water-cooled nitrogen gas blowing device 18 is a nitrogen pipe 20 through which nitrogen gas 15 is introduced, a cooling pipe 22 for cooling the nitrogen pipe, and attached to the furnace shell. Holder 24 (HOLDER) for fixing the pipe and prevent the leakage of the gas in the furnace, it consists of a catch clip (26) (CATCH CLIP) for sealing by coupling and fixing the cooling pipe and the holder.

In more detail, a quick disconnect coupling (20f) for connecting the air solenoid valve (20d) (AIR SOLENOID VALVE) to the nitrogen gas transfer pipe 20a through which the nitrogen gas having the flange (20b) is introduced And via a flexible pipe 20e.

The furnace backflow gas is shut off during normal operation, and the air solenoid valve 20d is opened when the furnace wall temperature is abnormal, and is composed of a check valve 20c (CHECK VALVE) through which nitrogen gas is introduced.

 The structure of the water-cooled nitrogen gas blowing device 18 in the furnace is divided into a direct blow lance and a circumferential blow lance by the shape of the tip of the nitrogen gas transfer pipe 20a, and in the case of the furnace wall gas distribution distribution control device 18a, Nitrogen gas is blown into the direction furnace 18b, and in the furnace wall part local heat load cooling device 18c, nitrogen gas 15 is blown into the furnace by the circumferential furnace 18d.

The cooling pipe 22 for cooling the nitrogen gas conveying pipe 20a has a flange 22a attached to the cooling pipe to be coupled to the flange 20b of the nitrogen gas conveying pipe 20a and is made of metal. TYPE) oval packing (22b) is attached and combined with the capture portion (24a) of the holder (HOLDER) (24) attached to the furnace shell (10), sealing (Sealing), cooling water feed pipe (22c) The cooling pipe 22 is inserted into the water supply 22f through the quick coupling 22d and the flexible pipe 22e and drained through the drain pipe 22g.

A fastening pin 26a is attached to the catch clip 26 (CATCH CLIP) sealing the cooling pipe 22 and the holder 24. When the fixing pin 26b is rotated, the fastening pin 26a is cooled down. The oval packing 22b of the 22 and the seal 24b of the holder 24 are compressed and combined.

The holder 24 is fixed to the furnace shell 10 so that the penetrating or replacing operation of the nozzle unit during clogging or damage of the tip nozzles 18b and 18d of the nitrogen gas conveying pipe 20a or during periodic repair of the blast furnace may be performed. It is separated from the cooling pipe 22 as much as possible, and it can be attached by the operation of the fixing pin 26b of the capture clip 26.

The present invention having such a configuration is operated by the following method.

As shown in FIG. 2, a heat load 14 is generated in a vertical direction inside the furnace at a portion of the furnace wall gas flow 13d that is excessively small in the furnace wall portion 12a, and the furnace thermometer 17a of FIG. 4. The temperature of is also raised in conjunction.

As described above, when the temperature of the furnace body thermometer 17a is increased due to the excessive distribution of the gas distribution in the furnace wall part, and the temperature becomes higher than the set temperature, it is output on the ECC screen of the central cab. The air solenoid valve 20d of the blowing device 18a is opened.

When the air solenoid valve 20d is opened, nitrogen gas is blown into the front horizontal blowing nozzle 18b of the nitrogen gas transfer pipe 20a, and the blown wall gas distribution distribution 13d is caused by the blown nitrogen gas. The gas flow path at the portion of the furnace wall direct heat load 14 is changed from the lower portion of the heat load generating portion toward the furnace center portion 13.

This suppresses the gas reduction reaction at the heat load generation site and controls the temperature of the furnace wall.

When the temperature of the furnace wall direct heat load 14 is lowered and the temperature detection value of the furnace thermometer 17a is lowered, the air solenoid valve 20d is closed by the PLC to block the inflow of nitrogen gas.

If the gas flow path is changed for a certain time due to the nature of the gas distribution in the furnace, the gas flow distribution in the portion 13b in which the gas flow path is formed becomes good, and the gas flow distribution is narrowed to the furnace wall, resulting in the gas flow distribution in the furnace. Go to 13a).

As described above, in order to improve the gas distribution in the furnace, it is unnecessary to continuously inject nitrogen gas to prevent deterioration of the furnace heat which may be generated when the nitrogen gas is blown for a long time.

Unlike the direct heat load generation at the portion of the furnace wall remaining delay due to excessive gas distribution in the furnace wall portion, as shown in FIG. 3, the heat load is generated as shown in FIG. 5 when the heat load 14a is generated by the local soft erosion 12b. The temperature of the thermometer 17b is increased or the cooling panel drain temperature rise is caused by the cooling panel glowing 11a, and is output on the center cab ECC screen.

Then, the air solenoid valve 20d of the furnace wall local heat load cooling device 18c is opened by PLC control, and nitrogen gas is introduced through the one-way nozzle 18d at the distal end of the nitrogen gas transfer pipe 20a. As described above, the cooling of the glowing cooling panel 11a and the cooling of the glowing metal shell 10a are prevented, and thus the breakage of the glowing cooling panel is prevented and the heat load of the steel shell is suppressed, thereby preventing the breakage of the iron 10b.

In order to manage the furnace and the furnace wall of the cooling blast furnace, if the heat load occurs in the area with little residual smoke measured by the measurement of the residual smoke of the furnace during the regular repair work, the heat load cooling device of the furnace wall part may be sprayed into the shell during normal operation. It is inserted in the place where (12a) is low during regular repair work to prevent the heat load of the steel bar.

As described in detail above, the distribution of gas distribution in the blast furnace furnace is controlled by changing the charging method of the charging material or by adjusting the flow of air blown through the air vents, thereby suppressing the fluctuations of yellowing in the furnace which may occur when the gas distribution is improved. To improve the productivity of the blast furnace and stabilize the blast furnace through stabilization of the furnace wall and the furnace equipment such as minimizing the heat load on the furnace wall with few residual smoke and preventing the breakage of the steel shells and suppressing the degradation of the furnace due to the inundation of the furnace. Provides the effect of operating.

Claims (3)

An apparatus for lancing nitrogen gas in a furnace by being installed in a blast furnace, the apparatus comprising: a first pipe (20) penetrating and installed in an outer surface of a furnace shell (10); A second pipe 20 ′ installed inside the first pipe 20 and having an inlet 100 formed at an outer end of the blast furnace, and an outlet 200 formed at the inner end of the blast furnace; A water supply pipe 22c penetrating through one side of the first pipe 20 and formed between an outer surface of the second pipe 20 '; A drain pipe 22g communicating with the other outer surface of the first pipe 20; One side is detached from the fastening part 300 formed on the outer surface of the first pipe 20, and the other side includes a holder 24 fixed to the furnace shell 10. Control unit. The inlet part 100 is connected to the first pipe 20 and the flanges 20b and 22a, and an air solenoid valve 20d is interposed to fasten the flexible pipe 22e to the outlet part. 200 is a horizontal furnace nozzle (18b), the circumferential nozzle (18d) is formed, the gas flow distribution control device in a furnace. According to claim 1, The fastening portion 300 is formed on the outer surface of the second pipe (20 ') is formed on the outer surface of the vertical surface and the inner surface of the packing (22b) is formed by the holder 24 is protruding Gas distribution distribution control device in the furnace furnace, characterized in that detachable.

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