JPS58101188A - Drying and heating method of dry quenching equipment of coke - Google Patents

Abstract

PURPOSE:To prevent the ignition of cold coke at the bottom of a quenching tower and control the temperature distribution in a coke oven and the circulating system, by controlling the total amount of a low-temperature gas blown into the quenching tower, and adjusting the amount of a high-temperature gas to be discharged by a damper and a stripping valve at the bottom of the quenching tower. CONSTITUTION:A cold coke 26 is charged into the bottom of a quenching tower 1, and a low-temperature gas is blown through a coke layer into the quenching tower 1 to control the total amount of the low-temperature gas by low-temperature controlling dampers 7, 8, 9 and 10. The amount of a high-temperature gas to be discharged is adjusted by a chimney 3 having a sufficient radiating capacity of the gas discharge and an adjusting damper 4 at the charging port of the quenching tower 1. The amount of the low-temperature gas to be discharged is adjusted by a releasing valve 21 at the bottom of the quenching tower 1 to control the temperatures of the respective parts in the coke oven and the circulating system at the target values.

Description

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

A conventional coke dry extinguishing equipment is shown in FIG. 1, for example, and the dry heat raising of this equipment must satisfy the following conditions. That is, the first condition is that cold coke (n) is charged at the bottom of the cooling tower (e) for thermal protection of the hardware, so that this coke (n) does not come out (c) while drying and heating up. I have to do this.

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

As a fifth condition, the cooling tower preliminary chamber and the dust remover f must be raised to different final target temperatures (cooling tower preliminary chamber ceiling 1000°C, dust remover 800°C) using one heat source.

Only when these three conditions are met can the coke dry extinguishing system be used for dry heating.

The first condition can be achieved by introducing relatively low temperature gas (170° C.) from the gas blowing device m at the bottom of the cooling tower. Injecting this relatively low-temperature gas,
With conventional equipment, it was difficult to control the amount of incoming gas within an appropriate value, and as a result, it was sometimes impossible to raise the temperature to the target temperature.

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 flow rate of combustion generated gas flowing toward the preliminary chamber, and the flow rate of gas flowing toward the annular flue →・residue f → boiler g → cyclone h → blowing side damper i → circulation fan/j. This is possible by adjusting the ratio. Therefore, a mechanism for controlling the flow rate of combustion exhaust gas is required in the preliminary chamber ceiling and the lower diffusion pipe. In the coke dry fire extinguishing equipment, an upper dispersion pipe C having a lower dispersion valve λ on the lower dispersion pipe k and a lower dispersion valve d on the ceiling of the preliminary chamber is conventionally provided. When looking at the ceiling of the equipment spare room, there are the following problems.

First, the diameter of the upper dissipation pipe C is 14 small in order to discharge combustion exhaust gas during dry heating. The flow of combustion generated gas t1. (flow to the preliminary chamber) and the pressure inside the furnace to 1 to 6 mm.
, qG cannot be maintained 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 flows out from the gap in the insertion part of the drying knife a, The pressure inside the furnace cannot be increased above about 3 Aq (200 mAq) because it will damage nearby metal objects such as the steel shell and at the same time be dangerous for 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 a conventional charging port cover, there is a , there is a water sealing mechanism p, and the part 8 that touches the water q and the part 8 that is not immersed in the water q,
Since no refractories have been installed, this part cannot be continuously exposed to the flow of hot gas (arrow t).

Second, since the upper 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.

An object of the present invention is to provide a dry heating method that satisfies the above-mentioned dry heating conditions for coke dry extinguishing equipment and does not cause the above-mentioned 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 an I lower diffusion valve.

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

In FIG. 6, 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 5 has an adjustment damper 4. Further, cold coke 6 is charged below the cooling chamber 5, where there is a metal gas blowing device, and a low temperature gas control damper 7゜8.9.10 is installed to control the total amount of low temperature gas. It is possible to do so. Also 1114 hot air generating furnace, 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 dry burner into the side wall of the cooling chamber 5, or by blowing hot air outside the circulation system through the hot air blowing nozzle 12 also inserted into the side wall of the cooling chamber 5. This is done by sending high-temperature gas generated in the hot air generating furnace 11 into the circulation system. The target temperature for dry heating of this equipment is equivalent to the operating temperature of each equipment, and the temperature in the cooling tower preliminary room is approximately 1000°C, and the temperature in the dehumidifier 1 at the inlet of the boiler 16 is
5 is about 800°C. Not only does it not need to raise the temperature of the dust remover 15 above about 800°C,
Due to the design heat resistance temperature of the boiler 16, it is not possible to raise the temperature excessively above 800°C. Further, the atmospheric gas temperature in the cooling tower 1 is set to a minimum target of 1000°cK because it is necessary to ultimately raise the preliminary chamber brick temperature to about 1000°C. Cold coke 6 is charged from this high-temperature atmospheric gas until the cooling equipment is completely filled. This cold coke 6 must not burn out or reach high temperatures during drying. If this cold coke 6 were to combust, and the temperature would reach such a point that it would start to combust again, litchis related to the gas injection 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, the minimum amount necessary to cool the cold coke 6 and maintain it below the ignition temperature is necessary. It is effective to blow low-temperature gas into the cooling tower from the bottom of the cooling tower through the cold coke layer. That is, it is necessary to determine the capacity of the hot air generating furnace 11 or the drying burner, taking into account the inflow of this low-temperature gas into the cooling tower.

In the present invention, as shown in FIG. 6, the amount of recirculated gas is controlled by providing channels 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 in 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 along the annular flue 22 and flowing to the descaler 15, each part can be controlled to the target @armpit.

In the present invention, a chimney 3 equipped with an adjustment damper 4 and having sufficient dispersion capacity for gas discharge is installed at the charging inlet on 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 transferred to the boiler 16.
The temperature drops to about 170°C, and after passing through the cyclone 17, the suction side damper 18, and being pressurized by the circulation fan 19, a part of the air is released into the atmosphere from the lower part of the air g20. Therefore, the amount of each high-temperature gas can be adjusted by the damper 4 of the chimney 6 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, upper dissipation pipe 1
3 is closed and high temperature gas is released from the charging port located in the center of the preliminary chamber ceiling 2 through the chimney 3, the flow of high temperature gas in the preliminary chamber is uniform,
- Enables uniform heating of the pre-chamber bricks. Since the pre-chamber brick is structurally very complex, the uniform heating is a very important issue.

The chimney 5, as seen enlarged in Fig. 4,
The charging device is divided into a charging port cover 26 and a charging hopper 24, and is mounted on separate carts 27 and 28 having temporary wheels 25 and 26, so that it can be installed in a separable structure. be. In other words, by placing the charging port cover and charging hopper, which were conventionally impossible to separate due to the body structure, on separate carts, when installing the chimney 3, the charging port cover 23 can be completely removed immediately after removing the chimney 3. It made it possible to close it.

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 having a regulating damper at the charging port of the cooling tower. By controlling the amount of high-temperature gas discharged with this damper and adjusting the amount of low-temperature gas discharged with the lower dissipation valve, the temperature of each part inside the furnace and the circulation system is set to the target value, so the cooling at the bottom of the cooling tower is controlled. It is possible to prevent coke from burning out, and to easily create a desired temperature distribution in the furnace and in each part of the 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 generation furnace, 12... Hot air blowing nozzle, 15... Dust remover, 16... Boiler, 19
...Circulation fan, 21...Lower dissipation valve. 3rd phantom falcon 4N

Claims (1)

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