JPH0125358B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dry heating method for coke dry extinguishing equipment.

The conventional coke dry extinguishing equipment is, for example, as shown in Fig. 1, but the dry heat raising of this equipment must satisfy the following conditions.
In other words, the first condition is that since cold coke n is charged at the bottom of the cooling tower e for thermal protection of the hardware, dry heating must be carried out while preventing this coke n from burning out. It won't happen.

The second condition is that the temperature of the bricks in the ceiling of the cooling tower preliminary room, where there is no gas flow other than convection, must be raised to the highest level and uniformly.

As a third condition, one heat source is used to set the cooling tower preliminary room and dust remover f to different final target temperatures (cooling tower preliminary room ceiling 1000°C, dust remover f 800°C).
temperature must be raised to ℃).

Only when these three conditions are met can the coke dry extinguishing equipment be called dry heating.

The first condition is that the gas blowing device m at the lower part of the cooling tower
This is possible by introducing relatively low temperature gas (170°C) from the It is possible to inflow this relatively low-temperature gas with conventional equipment, but conversely, it is not possible to control the amount of inflowing gas within an appropriate value, and as a result, it is impossible to raise the temperature to the target temperature. Sometimes it happened.

The second condition can be achieved by generating and controlling a gas flow in the cooling tower preliminary chamber. Therefore, a mechanism for controlling the discharge flow rate of combustion exhaust gas is required on the ceiling of the preliminary chamber. .

The third condition is the amount of combustion generated gas flowing toward the preliminary chamber, and the circular flue → dust remover f → boiler g →
This is possible by adjusting the flow rate ratio of the gas flowing from the cyclone h to the blow-in side damper to the circulation fan j. Therefore, the ceiling of the preliminary chamber and the lower diffusion pipe are equipped with a mechanism to control the discharge flow rate of combustion exhaust gas. is necessary. In coke dry extinguishing equipment, a lower radiation pipe (k) with a lower radiation valve (l) and an upper radiation pipe (c) equipped with a lower radiation valve (d) in the ceiling of the preliminary chamber have been conventionally installed. When looking at the ceiling of the room, there are the following problems.

First, the diameter of the upper dissipation tube c is small enough to discharge combustion exhaust gas during dry heating. Therefore, it is necessary to ensure the flow of combustion generated gas (flow to the preliminary chamber) in the amount necessary to raise the temperature of the preliminary chamber bricks, and
It is not possible to maintain the furnace pressure at 1 to 3 mmAgG at the same time. This is because when the pressure inside the furnace is increased to ensure the flow of combustion gas to the preliminary chamber, high-temperature combustion gas blows out from the gap in the insertion part of drying burner a, causing damage to metal objects such as iron shells in the vicinity. The pressure inside the furnace cannot be increased above approximately 3 mmAqG, as this would cause damage and be dangerous to nearby workers. Therefore, with conventional equipment, it is not possible to ensure the necessary flow of combustion gas to the pre-chamber side, and it is not possible to raise the pre-chamber bricks to the target temperature. On the other hand, if the charging port is fully opened, it will be too large. In addition, in order to compensate for the lack of dissipation capacity of the upper dispersion tube c, when the opening of the charging port is controlled by the conventional charging port cover b, the charging port has an opening as shown in Fig. 2, which is also enlarged. To,
There is a water sealing mechanism p, and the part r that comes into contact with water q and the part s that is not immersed in water q are not coated with refractories, so high temperature gas flows continuously through these parts (arrow t). cannot be exposed to

Second, since the above-mentioned diffusion pipe c is not provided at the center of the ceiling of the preliminary chamber, the flow of the combustion gas is uneven, making it difficult to uniformly heat the bricks of the ceiling of the preliminary chamber.

SUMMARY OF THE INVENTION An object of the present invention is to provide a dry heating method that satisfies the dry heating conditions described above for coke dry extinguishing equipment and does not cause the aforementioned problems of conventional methods.

For this reason, the present invention controls the total amount of low-temperature gas blown into the cooling tower from the lower part of the cooling tower through the cold coke layer, and also provides a chimney with an adjustment damper at the charging port of the cooling tower. It is characterized by controlling the temperature of each part of the furnace and the circulation system to a target value by adjusting the amount of high-temperature gas discharged with a damper and the amount of low-temperature gas discharged with a lower diffusion valve.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

In FIG. 3, reference numeral 1 denotes a cooling tower of a coke dry extinguishing system, and a chimney 3 is installed at the charging port in the center of the ceiling 2 of the preliminary room, and the chimney 3 has an adjustment damper 4. Further, cold coke 6 is charged in a lower part than the cooling chamber 5, and there is a metal gas blowing device here, and low-temperature gas control dampers 7, 8, 9, 10.
is provided so that the total amount of low-temperature gas can be controlled. Further, 11 is a hot air generating furnace, and 12 is a hot air blowing nozzle. In other respects, there is no major difference from conventional equipment.

As mentioned above, drying of the coke dry extinguishing equipment is carried out by directly inserting a drying burner into the side wall of the cooling chamber 5, or by blowing hot air outside the circulation system from the hot air blowing nozzle 12 also inserted into the side wall of the cooling chamber 5. The high temperature gas generated in the generating furnace 11 is sent into the circulation system. In this equipment, the target temperature for dry heating is equivalent to the operating temperature of each equipment, and the cooling tower preliminary room is approximately
1000℃, the dust remover 15 at the inlet of the boiler 16 is approximately
The temperature is 800℃. The temperature of this dust remover 15 is approximately 800℃
Not only is there no need to raise the temperature above 800°C, but it cannot be raised excessively above 800°C due to the design heat-resistant temperature of the boiler 16. In addition, the atmospheric gas temperature in cooling tower 1 will eventually rise to about 1000
Since it is necessary to raise the temperature to 1,000 degrees Celsius, we have set a target of at least 1,000 degrees Celsius. In order to protect the metal gas blowing device at the bottom of the cooling tower 1 from this high-temperature atmospheric gas, cold coke 6 is charged until the gas blowing device related equipment is completely filled during the drying heating process. This cold coke 6 must not burn out or become hot during drying. If this cold coke 6 were to combust, and if the temperature reached such a temperature that it would start to combust again, the liners associated with the gas blowing device buried therein would be damaged. Therefore, in order to raise the temperature to the target temperature and to prevent the cold coke 6 at the bottom of the cooling tower from burning out, it is necessary to cool the cold coke 6 and maintain it below the ignition temperature. It is effective to blow a minimum amount of low-temperature gas into the cooling tower from the bottom of the cooling tower through the cold coke layer. That is, after considering the inflow of this low-temperature gas into the cooling tower, the hot air generating furnace 11
Alternatively, it is necessary to determine the capacity of the drying burner.

In the present invention, as shown in FIG. 3, the amount of recirculated gas is controlled by providing dampers 7 to 10 in all the gas passages of the low temperature gas blowing section.

Next, a method of bringing the temperatures of the upper preliminary chamber of the cooling tower 1 and the dust remover 15 to their respective different operating temperatures, that is, the heating target temperature will be explained.

The gas temperature at each part is determined by the amount of gas and heat exchange with the brick wall. Therefore, by adjusting the amount of high-temperature gas flowing toward the preliminary chamber and the amount of high-temperature gas flowing through the annular flue 22 to the dust remover 15, each part can be controlled to the target temperature.

In the present invention, a chimney 3 equipped with an adjustment damper 4 and having a sufficient dispersion capacity for gas exhaust is installed at the charging inlet in the ceiling of the cooling tower 1. With a pressure difference of released into the atmosphere. On the other hand, the high-temperature gas that separates from the high-temperature gas flowing toward the preliminary chamber in the cooling tower 1 and passes through the annular flue 22 to heat the dust remover 15 is
When passing through the boiler 16, it is cooled down to a temperature of about 170°C, passes through the cyclone 17, the blow-in side damper 18, and is pressurized by the circulation fan 19.
A portion is released into the atmosphere from the lower diffusion pipe 20. Therefore, the amount of each high-temperature gas can be adjusted by the damper 4 of the chimney 3 at the charging port and the lower release valve 21 while monitoring the pressure inside the cooling tower 1 and the temperature of each part. In addition, closing the diffusion valve 14 of the upper diffusion pipe 13 and releasing high-temperature gas from the charging port located in the center of the ceiling 2 of the preliminary chamber through the chimney 3 means that the flow of high-temperature gas in the preliminary chamber is This makes it possible to uniformly heat the pre-chamber bricks. Since the pre-chamber brick is structurally very complex, the uniform heating is a very important issue.

The chimney 3 has a charging port cover 23 and a charging hopper 2 of the charging device, as shown in an enlarged view in FIG.
The assembly is made possible by dividing the assembly into four parts and placing them on separate carts 27 and 28 having temporary wheels 25 and 26, so that they can be separated. That is, the chimney 3 can now be attached by placing the charging port cover and the charging hopper, which were previously integrally constructed and could be separated, on separate carts.
In addition, a power cylinder 29 is attached to the charging port cover truck 27, so that when moving to a hot run, it is possible to completely close the charging port cover 23 immediately after clearing the chimney 3.

As mentioned above, the present invention controls the total amount of low-temperature gas blown into the cooling tower from the lower part of the cooling tower through the cold coke layer, and also provides a chimney with a regulating damper at the charging port of the cooling tower. By adjusting the amount of high-temperature gas discharged with this damper and the amount of low-temperature gas discharged with the lower diffusion valve, the temperature of each part of the furnace and the circulation system is set to the target value, so that the cold coke at the bottom of the cooling tower is It is possible to prevent flare-ups and easily create good temperature distribution in each part of the furnace and circulation system from a single heat source.

[Brief explanation of drawings]

Fig. 1 is an elevational view schematically showing a conventional coke dry extinguishing equipment, Fig. 2 is an enlarged explanatory view of the charging port cover in Fig. 1, and Fig. 3 is an overview of an embodiment of the present invention. The elevational view, FIG. 4, is an enlarged explanatory view showing the relationship between the chimney, the charging port cover, and the charging hopper shown in FIG. 3. 1... Cooling tower, 2... Preliminary room ceiling, 3... Chimney, 4... Adjustment damper, 5... Cooling room, 6... Cold coke, 7, 8, 9, 10... Low temperature gas control damper , 11... Hot air generating furnace, 12... Hot air blowing nozzle, 15... Dust remover, 16... Boiler, 19
...Circulation fan, 21...Lower relief valve.

Claims (1)

[Claims] 1 The total amount of low-temperature gas that is blown into the cooling tower from the lower part of the cooling tower of the coke dry extinguishing equipment through the cold coke layer is controlled, and a chimney with a damper is installed at the charging inlet of the cooling tower to control each part of the furnace. and coke, characterized in that the flow rate distribution of hot air is adjusted by a damper and a lower radiation valve of the chimney so as to create a target temperature distribution in the circulation system, and the temperature of the hot air is controlled by the amount of recirculated gas and the amount of combustion gas. Dry heating method for dry fire extinguishing equipment.