JPH0376788A - Drying and heating dry quenching equipment of coke oven - Google Patents

Abstract

PURPOSE:To downsize and simplify combustion equipment and incidental facilities, to curtail fuel, as well as to shorten the time required to switch over to normal operation by supplying a high-temperature gas to a cooling column from a hot air blowing nozzle provided downwardly at the top of the column to thereby dry and heat dry quenching equipment of a coke oven. CONSTITUTION:A high temperature combustion gas is introduced into a cooling column 1 from a combustion device 20 provided above a coal charging port 19 at the top of the cooling column, mixed with a gas blown from the bottom of the cooling column to lower its temperature, and then conveyed with pressure from a smoke duct 2 to subsequent stages through a boiler 3 by a circulation fan 4. A major part of the gas is diffused into the air from a diffusion pipe 8, while a part thereof is brought back to the inside of the cooling column 1 from an opening at the bottom of the column. By the above method in which a combustion gas is blown into a portion whose temperature reaches maximum during the operation, it is possible to obtain a temperature distribution as ideal as that during the operation, leading to downsizing and simplification of a combustion device and a duct, curtailment of fuel, and simplification of the procedures for removing the dry quenching equipment, which eventually results in shortening of the time require to switch over to normal operation.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention is used to heat the refractories inside the cooling tower and the flue to a predetermined temperature when a coke dry extinguishing system is constructed or after periodic inspection. This invention relates to a method for increasing the drying temperature of coke dry extinguishing equipment.

``Prior art'' Coke dry extinguishing equipment uses inert gas to cool red-hot coke fired in a coke oven.
An example is shown in FIG. In the figure, 1 is a cooling tower, and the red hot coke introduced from the top is cooled by low-temperature inert gas blown from the bottom while descending inside the cooling tower, and is discharged from the bottom opening (not shown). . On the other hand, heated inert gas is discharged from the upper part of the cooling tower 1 to the flue 2, and this inert gas enters the boiler 3 after being removed by a dust remover. Here, the inert gas is cooled as heat is recovered, and the pressure is increased by the circulation fan 4 and the inert gas reaches the cooling tower 1 again.

In the above-mentioned coke dry fire extinguishing equipment, the boiler is heated with soda boiling to clean the boiler tubes, the bricks in the cooling tower and the dust remover are dried, and the entire plant is heated during normal operation prior to the actual operation of the plant. (In this specification, both are referred to collectively as dry heating) to raise the temperature.

The dry heating method conventionally used in coke dry extinguishing equipment will be explained with reference to FIG. The combustion gas is introduced into the cooling tower 1 through the cooling tower 1, and the combustion gas is mixed with gas blown from the lower part of the cooling tower 1, as in normal operation, and is lowered to an appropriate temperature. In order to mix the gases in this way, the temperature of the bricks on the inner periphery of the cooling tower 1 must be raised at a slow rate of, for example, 100°C/day, and the temperature of the mixed gas must be gradually increased accordingly. Although the purpose is to ultimately make the fire extinguishing equipment system have a temperature distribution pattern similar to that during operation, the cooling tower 1 into which the duct 6a is inserted
The lower part of the brick is low during normal operation, and the temperature of the combustion gas is very high compared to this, so this is to prevent thermal damage to the bricks by mixing the low temperature gas. The temperature of the mixed gas is adjusted by adjusting the temperature and volume of the combustion gas and the volume of low-temperature blown gas (the amount of gas blown is adjusted by the damper 7 at the bottom of the cooling tower). This is performed by adjusting the fuel supply amount and air-fuel ratio in the combustion device 6.

Even during the dry temperature rising, the coke dry extinguishing equipment is in the same operating state as in normal times, and the circulation fan 4 is in operation.

The mixed gas of the above-mentioned combustion gas and the gas blown into the lower part of the cooling tower heats the bricks laid on the inner periphery of the cooling tower 1, and then flows into the flue 2 through the communication part at the upper part of the cooling tower. The bricks in the inner layer of the dust eliminator are heated. After reaching the boiler 3 and being cooled there, it reaches the circulation fan 4 and is sent under pressure to the subsequent stage. Although most of the gas is diffused into the atmosphere through the lower diffusion pipe 8, the negative part of the gas is returned to the cooling tower 1 through the lower opening.

Here, the temperature of the brie chamber 1a provided at the upper part of the cooling tower 1 needs to be raised to a very high temperature at the end of the temperature rise for drying. Gas does not flow into the prechamber during normal operation, but during drying and heating, a chimney 9 is temporarily installed at the coke charging inlet at the top of the prechamber la to allow the mixed gas to flow, especially at the end of drying and heating. By passing a large amount of gas, the bricks placed around the inner periphery of the prechamber la are heated.

"Problem to be Solved by the Invention" By the way, during the drying temperature raising process, the refractory bricks laid in the cooling tower 1 have a temperature distribution similar to that during operation, that is, a high temperature at the top and a low temperature at the bottom. It needs to be heated to. However, in the conventional dry heating method described above, combustion gas is blown into the cooling tower 1 from the bottom, so the temperature distribution tends to be high at the bottom and low at the top, contrary to the ideal temperature distribution. be.

In order to heat at least the bricks on the inner periphery of the brick chamber la to a high temperature in order to avoid such problems, it is necessary to blow a large amount of mixed gas at a lower temperature. The reason for lowering the temperature is to prevent the temperature at the lower part of the cooling tower from rising, and the reason for blowing in a large amount is to prevent the temperature of the gas flowing into the brie chamber 1a from decreasing.

However, in this case, the following problem occurs.

A: A large combustion device 6 is required.

The burner itself has a large capacity and is therefore expensive.

On the other hand, the drying combustion device 6 requires not only a burner, but also a combustion air blower, combustion air piping, fuel gas piping, a fuel gas booster, various valves, etc. If the combustion device 6 becomes large, these auxiliary devices are required. It will also be large. In addition, combustion equipment and auxiliary equipment,
Due to the installation of piping, a large amount of space is required within the coke dry extinguishing equipment, and there are significant layout restrictions.

Furthermore, when the drying temperature raising process is completed, the combustion equipment and the like must be removed, and the space for their arrangement is wasted during normal operation. Therefore, it is economically undesirable to increase the size of the devices and their installation space.

B Fuel consumption increases.

Since a large amount of combustion gas must be blown into the cooling tower 1, fuel consumption increases.

In particular, a large amount of high-temperature gas is discharged to the outside at the end of the drying temperature rise period, which increases fuel consumption.

Furthermore, the fuel pipes connected to the combustion device 6 will be drawn from a considerable distance, and the larger the diameter of the pipes, the more the pipes, supporting materials, pipe space, etc. that are installed will be wasted.

A large opening 1b for inserting the duct is required at the bottom of the C cooling tower 1.

If the opening 1b provided in the side wall of the cooling tower 1 becomes large, this is not preferable in terms of furnace construction. In addition, this opening 1b will be restored by closing it with a fireproof material after the drying and heating process, but the larger the opening 1b is, the more troublesome the restoration work will be, and the quicker it will be to minimize the temperature drop. This will hinder the required recovery work. In addition, it is difficult to make the space between the duct 6a and the opening lb airtight in the drying temperature raising process, and there is a risk that high temperature gas may blow out from this part due to pressure fluctuations in the furnace, which is dangerous.

D A temperature imbalance occurs in the cooling tower 1 along the circumferential direction.

In order to reduce the temperature imbalance, it is desirable to blow high-temperature combustion gas into the furnace from the center of the cooling tower 1, but in recent years, as coke dry extinguishing equipment has become larger, the diameter of the cooling tower 1 has increased. Now that I'm older, this is difficult.

If a long duct 6a that reaches the center of the cooling tower 1 is installed, there is a risk that the duct 6a itself, which is usually made of a steel plate, will become hot and collapse under its own weight. In addition, when supporting the duct in the cooling tower 1, it will be supported by cold coke C laid at the bottom of the cooling tower, but the inner surface of the duct must be lined with castable refractories to prevent the cold coke C from igniting. This increases the weight and makes it difficult to support.

Further, after the drying and heating process, the combustion device 6 must be removed, but in particular, removing the duct 6a from the high-temperature furnace is a dangerous operation and requires a lot of time.

E In order to protect the cold coke C at the bottom of the cooling tower 1, it becomes necessary to lay insulating bricks on the top surface.

Since high-temperature combustion gas is directly blown into the vicinity of cold coke C at the bottom of cooling tower l, there is a risk that cold coke C may ignite, and to avoid this, insulating bricks are placed on top of cold coke C. However, this brick laying work is very troublesome and takes a long time.

After the drying and heating process, the insulating bricks mixed into the cooled coke cut out from the cooling tower 1 cannot be fed into the subsequent blast furnace, so they must be removed, but it takes a long time to cut out all the bricks. This brick removal work limits the cutting out of cold coke, which in turn limits the operation of coke dry extinguishing equipment. In addition, the brick removal work involves picking up bricks on the conveyor, which is very dangerous work.

The present invention has been made in view of the above circumstances, and it aims to simplify the size and size of combustion equipment and ducts, reduce fuel consumption, facilitate the installation and removal of drying and heating equipment, and thereby transition from drying and heating to normal operation. The object of the present invention is to provide a drying and heating method for coke dry extinguishing equipment that can shorten the drying period.

"Means for Solving the Problems" In order to achieve the above object, the present invention installs a hot air blowing nozzle facing downward to the coke charging port provided at the top of the brie chamber in the upper part of the cooling tower, and blows hot air from the nozzle. The present invention is characterized in that the temperature of the coke dry cooling equipment is increased by supplying combustion gas into the cooling tower.

"Function" A hot air blowing nozzle is attached to the coke charging port at the top of the brie chamber, which is at the highest temperature during operation, and the combustion gas is blown into the cooling tower from here.The combustion gas blown into the cooling tower is After heating the prechamber 1a, it is mixed with gas blown from the lower part of the cooling tower and lowered to an appropriate temperature. Then, this mixed gas reaches the upper part of the cooling tower 1 while heating the bricks in the cooling tower 1, and flows toward the flue 2 side.

As mentioned above, since the combustion gas for heating is blown into the part that is to be heated to the highest temperature, the coke dry extinguishing equipment system in the dry heating process has an ideal temperature distribution pattern similar to that during operation. . That is, the upper part of the cooling tower becomes hot and the lower part becomes cold.

"Embodiment" Hereinafter, an embodiment of the present invention will be briefly described with reference to the drawings. In the drawings, the same components as in the conventional example are designated by the same reference numerals, and their explanations will be omitted.

First, before explaining the method of the present invention, a coke dry extinguishing equipment suitable for carrying out the method of the present invention will be explained. As shown in FIG. is provided, and the present invention utilizes this.

That is, the combustion device 2 is installed above the coke charging port 19.
0 is installed, and a duct 21 extending from the combustion device 20 is pushed through the coke charging port 19, with its tip protruding into the cooling tower l.

Then, high-temperature combustion gas is directly introduced into the brie chamber la from this duct 21 to perform drying and heating.

FIG. 3 shows a specific installation example of the combustion device 20.

Combustion device 20 is supported via support member 24 by a portion of bridging and charging equipment (both not shown). The combustion device 20 is equipped with a fuel gas pipe, a combustion air pipe, a pilot burner, a misfire detector, etc., like a general burner.

In addition to the function of sending combustion gas into the cooling tower 1, the duct 21 also has the function of sending combustion gas into the cooling tower 1.
The duct also functions as a combustion cylinder for burning gas.

Further, 25 is a lid that closes the coke charging port 19 in the upper part of the cooling tower 1, which blocks the inside of the furnace filled with high-temperature gas from the outside and allows the duct 21 to pass therethrough.

The lid 25 is usually made of a steel plate, and a heat insulating material 26 is stretched on the inside to protect it from heat. Additionally, a water seal is placed between the outer periphery of the lid 25 and the cooling tower 1 to keep the inside of the cooling tower 1 airtight, but this is different from the furnace lid used during normal operation. It's the same.

Next, the method of the present invention will be explained using the above coke dry extinguishing equipment.

High-temperature combustion gas is introduced into the cooling tower 1 from a combustion device 20 provided above the coke charging port 19 at the top of the cooling tower 1 via a duct 21 that passes through a lid 25 . The combustion gas is mixed with gas blown from the lower part of the cooling tower 1 as in normal operation, and the temperature is lowered to an appropriate temperature. And the second
As shown in the figure, it passes through the communication part 28 at the top of the cooling tower 1 to reach the flue 2, and from there it passes through the boiler 3 and then the circulation fan 4.
is pumped to the subsequent stage. Most of the gas is then dissipated into the atmosphere from the lower dispersion pipe 8, and some of the gas is returned to the cooling tower.
is returned into the cooling tower l through the lower opening of the cooling tower l.

The mixture of the combustion gas and the gas blown into the lower part of the cooling tower heats the bricks laid on the inner periphery of the cooling chamber 1, but the target heating temperature of the bricks to be heated is the lower part of the cooling tower 1. , upper brie chamber la, flue communication part 28
, and the flue 2. Ideally, the temperature decreases in the following order: brie chamber la > flue communication section 28 > flue 2 > lower part of the cooling tower. Contrary to the conventional method, in the method of the present invention, the combustion gas is supplied from the brie chamber la that should be heated to a higher temperature, so the areas that should be heated to a higher temperature can be heated to a higher temperature, and the areas that should be lowered to a lower temperature can be lowered to a lower temperature. .

That is, after the combustion gas generated from the combustion device 20 heats the combustion chamber 1a, the temperature of the combustion gas itself decreases a little, and then reaches the flue 2 through the flue communication part 28. The small flue 28a and the circular flue 28b constituting the flue communication section 28 are the parts of the cooling tower 1 where the largest amount of refractory material (bricks) is used, and in the method of the present invention, compared to the conventional room, By flowing higher temperature gas, this area can be effectively heated. On the other hand, the side wall portion at the bottom of the cooling tower 1 is a place where there is a small amount of bricks, and the temperature is relatively low even during normal operation. Although fuel gas does not flow sufficiently into this part, it can be heated to the required temperature by the combustion gas supplied from the duct 21 and the radiant heat from the heated bricks in the high temperature chamber 1a.

Note that in order to protect the steel gas blowing device 29 at the bottom of the cooling tower 1 from radiant heat, the upper part is filled with cold coke C (in the method of the present invention, cold coke is not necessarily necessary since the temperature is low). In order to prevent the temperature of the bricks and cold coke C on the lower side wall of the cooling tower from rising too much, and to adjust the temperature of the gas flowing into the flue communication section 28 and the flue 2, a gas blowing damper is used as in the conventional example. 7 is adjusted so that the cooling gas flows into the cooling tower 1 via the blowing device 29.

It is necessary to gradually raise the temperature of the bricks in the cooling tower 1, and in order to cope with this, the temperature of the combustion gas is gradually raised.The temperature control at this time is performed by a temperature sensor 30 installed in the prechamber 1a. The fuel gas flow rate and air-fuel ratio (
In other words, this is done by adjusting the amount of fuel and air individually or individually.

In addition, since the duct 21 for blowing combustion gas is arranged vertically, there is no need to support and support the duct 1-21 by the cold coke C at the bottom of the cooling tower 1 as in the conventional example, and in addition, the duct 1-21 is castable. There is no need for protection from heat by lining or the like.

Therefore, it has the advantage of being lightweight and easy to support.

Additionally, the combustion device 20 can be easily installed and removed. That is, a large crane is usually placed at the top of the cooling tower 1 as part of coke transport equipment, and a frame 1 at the top of the crane is installed for repairing the mechanical part of the crane.
It is common for a jib crane to be placed at
By effectively utilizing these cranes, the combustion device 20, the nozzle 21, the support member 24, and the lid 25 can be hung or hoisted as an integral structure, and installation and removal can be easily performed.

In addition to the main body of the combustion device, the drying temperature raising combustion device 20 is equipped with many accessory devices such as a combustion air blower, various valves, an operation panel, and gauges. However, in the embodiment of the present invention, the combustion device 20 is placed at almost the same level as the charging floor. This has the advantage that the combustion equipment auxiliary equipment can be placed on the charging floor with a large space, and that installation, removal, and transportation of these items can be easily performed using the crane.

In addition, if the duct 21 is made to have a double jacket structure as shown in FIG. It also plays the role of cooling 21,
Duct strength becomes more stable. Further, by flowing air for diluting high-temperature combustion gas through the jacket portion 31, the gas temperature can be freely adjusted regardless of the air-fuel ratio. Furthermore, since it is not necessary to supply more combustion air than necessary (to adjust the temperature by adjusting the air-fuel ratio), the combustion state can be stabilized. Furthermore, as shown in FIG.
By introducing the secondary air into the duct inner cylinder 21a, in addition to the above-mentioned advantages, a more ideal combustion state can also be obtained.

In addition, in the above embodiment, an example was described in which the combustion device 20 was installed directly above the coke charging port 19 at the top of the cooling tower 1, but the combustion device 20 may be placed in another location, A duct 21 extending from the coke charging port 19 may be inserted through the duct 21 to blow combustion gas into the cooling tower 1 from above.

"Effects of the Invention" As explained above, the present invention provides the following excellent effects.

■ Heating combustion gas is supplied through a duct from the coke charging port at the top of the brie chamber, which is at the highest temperature during operation, and has excellent thermal efficiency because high-temperature combustion gas can be supplied to the location where high temperatures are desired. Even if the amount of heat input is small, it can be used effectively, so the combustion device and ancillary equipment (combustion air fan, etc.) can be downsized.

Furthermore, since the temperature distribution of the bricks and the gas during normal operation can be made to be the same, it is possible to ideally increase the drying temperature of coke dry extinguishing equipment.

■ Good thermal efficiency reduces fuel consumption and saves energy. Further, the fuel supply system can be downsized.

(2) Since the combustion gas is supplied using the coke charging port, there is no need for an opening at the bottom of the cooling tower for insertion of the combustion gas supply duct, as in the conventional case. Since the cooling tower itself has a brick structure, eliminating the need for openings increases structural stability.

Furthermore, it is no longer necessary to close the opening in the lower side wall of the cooling tower during recovery work after drying and heating, which shortens the transition time from drying and heating to normal operation. It can also prevent rapid cooling (a large amount of cold air entering through the opening and escaping through the furnace mouth). It should be noted that the work of closing the opening was dangerous as it required work under high temperatures, but eliminating this is preferable from the standpoint of safety.

In addition, the temporary chimney that was previously used is no longer necessary.

- Since combustion gas can be supplied to the horizontal center of the cooling tower, the temperature can be made uniform in the circumferential direction of the cooling tower.

■ The distance from the combustion gas supply section to the cold coke at the bottom of the cooling tower is large, and the cold coke never reaches high temperatures, so there is no need to worry about it igniting. This eliminates the need for insulating brickwork, which was conventionally performed to cover the top surface of cold coke, and also eliminates the need for recovery work, which shortens the transition period to full-scale operation.

■ Since the duct can be placed vertically, there is no bending compared to the conventional case where the duct is placed horizontally, making it easier to support the needle and providing structural stability.

In addition, there is no need for castable lining on the inner surface of the duct, which was conventionally done, and the weight can be reduced, making installation and removal easier.

[Brief explanation of drawings]

Figures 1 to 4 (a) and (b) show an embodiment of the method of the present invention, in which Figure 1 is a schematic process diagram of drying and heating up a coke dry extinguishing equipment, and Figure 2 is a diagram of a cooling tower. Longitudinal sectional view, 3rd
The figure is a cross-sectional view of the upper part of the cooling tower, Figure 4 (a) is a cross-sectional view showing an example of the tip of the duct, Figure 4 (b) is a cross-sectional view showing a modified example of the same duct, and Figure 5 is a conventional coke FIG. 6 is a schematic process diagram of the dry heating process of the dry fire extinguishing equipment, and is an overall configuration diagram of the coke dry fire extinguishing equipment. 1... Cooling tower, 2... Flue, 3... Boiler, 4... Circulation fan, 19... Coke charging inlet, 20... Combustion device, 21... Duct, 24... Support part, 25... Lid, 26... Heat insulation material, 28. ...Communication section, Figure 1

Claims (1)

[Claims] The coke dry extinguishing equipment is characterized in that a hot air blowing nozzle is attached to the coke charging port at the top of the cooling tower so as to face downward, and high temperature gas is supplied from the nozzle into the cooling tower. Warm method.