JP2002265949A - Coke dry-quenching apparatus and coke production method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coke dry-quenching apparatus which can uniformize the improvement effects of coke. SOLUTION: A blow-in port 13 for blowing air into a spare chamber of a coke dry-quenching apparatus is formed in the chamber. On the sidewall of the chamber, an obstacle member 11 capable of advancing to or retracting from the inside of the chamber is installed. At the tip of the obstacle member 11, a temperature sensor 12 is installed. Basing upon the measured value of the temperature sensor 12, the amount of advancement of the obstacle member is adjusted to thereby control the falling speed of coke. When the temperature of a measured place is lower than that of another place, the obstacle member is advanced to thereby elevate the temperature enough before causing coke to fall. When the temperature of the measured place is higher, the obstacle member is retracted to increase the falling speed. Thus, the improvement effects of coke is uniformized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for improving the quality of coke by charging red-hot coke carbonized at a low temperature in a coke oven into a dry fire extinguishing facility and reheating and carbonizing the coke in the dry fire extinguishing facility.

[0002]

2. Description of the Related Art In recent years, extending the life of a coke oven for producing blast furnace coke has become a major problem. In a room-type coke oven, the life of the coke oven is extended by performing dry distillation at a low temperature. On the other hand, hot air containing oxygen-containing gas or hydrocarbons is blown into the spare room of the dry fire extinguishing system (CDQ) to reheat the coke. There has been proposed a method for producing coke for a blast furnace, which secures quality (strength) by firing.

When coke is reheated and fired, it is necessary that the coke be uniformly heated and fired in the preliminary chamber. For the purpose of uniform reforming of coke, there is known a technique of installing a coke segregation preventing device at an inlet portion of an upper portion of a prechamber and adjusting a particle size distribution in a radial direction of the prechamber. By adjusting the particle size distribution, the reheat gas passes almost uniformly in both the central part and the peripheral part in the preliminary chamber. Thereby, coke can be heated uniformly.

Although coke is not reheated and fired, CDQ is used for uniform cooling of coke.
(See Japanese Patent Application Laid-Open No. 57-108190) is also known in which a speed adjusting device for adjusting the falling speed of coke is provided at the bottom of the cooling chamber. In this CDQ, the falling speed of red hot coke is differentiated between the exhaust passage side and the opposite side,
The coke is cooled while adjusting the residence time of the coke located on each side in the tower.

[0005]

By installing the above-described segregation preventing device, it is possible to make the particle size distribution of coke in the radial direction of the preliminary chamber uniform, thereby preventing the radial flow of the reheat gas. Can be. However, even if the segregation prevention device is installed, the particle size distribution of coke in the circumferential direction cannot be made uniform, so that the deflected hot air in the circumferential direction cannot be prevented. Furthermore, when the particle size distribution changes significantly, it becomes very difficult to control the flow of hot air in the radial direction even if a segregation preventing device is installed. As a result, a coke temperature distribution occurs, and the reforming of the coke becomes uneven in the circumferential and radial directions. If the target of the reforming effect is set to a certain value or more, the reforming of coke becomes uneven, so that an extra reheating gas is required, and the energy consumption increases.

Further, in a CDQ provided with a speed adjusting device for adjusting the falling speed of coke at the bottom of the cooling chamber, coke can be cooled uniformly on the exhaust passage side and on the opposite side thereof. It is not possible to eliminate the non-uniform effect of the coke reforming effect due to the non-uniform particle size distribution in the chamber.

Accordingly, an object of the present invention is to provide a coke dry-type fire extinguishing system that can make the effect of reforming coke uniform.

[0008]

Means for Solving the Problems To solve the above problems, the inventors of the present invention provide a coke dry-type fire extinguishing system for improving the coke quality by injecting a reheating gas into a prechamber. Was measured, and the speed at which the coke descended was controlled so that the temperature distribution of the coke became uniform.

In other words, the invention of claim 1 comprises a blowing means for blowing hot air containing an oxygen-containing gas or a hydrocarbon into a preliminary chamber, a temperature measuring means for measuring the temperature of coke in the preliminary chamber, The above-mentioned problem has been solved by a coke dry-type fire extinguishing facility, comprising: speed control means for controlling a speed at which coke descends in the preliminary chamber based on the temperature.

The speed at which coke descends is controlled as follows. If the temperature at the measured location is lower than at other locations, reduce the rate of coke lowering and allow the temperature to rise sufficiently before lowering the coke. On the other hand, when it is high, the coke descending speed is increased in order to suppress the coke reaction deterioration due to the reaction of coke such as CO ₂ and H ₂ O. Thereby, the coke reforming effect can be made uniform.

Further, the invention according to claim 2 is provided at an inlet for blowing hot air containing an oxygen-containing gas or a hydrocarbon into the preliminary chamber, a temperature sensor for measuring the temperature in the preliminary chamber, and a side wall of the preliminary chamber, The above-described problem has been solved by a coke dry-type fire extinguishing system characterized by including a reciprocating obstruction member inside the spare room.

By controlling the advance of the obstruction member, the descending speed of the coke can be controlled.

According to a third aspect of the present invention, in the coke dry-type fire extinguishing equipment according to the second aspect, a plurality of obstructing members are provided radially from a center line of the spare room.

By providing the obstruction member radially from the center line of the preliminary chamber, the effect of reforming coke in the circumferential direction of the preliminary chamber can be made uniform.

According to a fourth aspect of the present invention, in the coke dry-type fire extinguisher according to the second or third aspect, a plurality of the blowing ports are provided in a circumferential direction of the spare chamber, and each blowing port has a blowing port. A flow control valve for controlling the amount is provided.

Here, the blowing amount is controlled such that the blowing amount of the blowing port near the low temperature portion is increased and the blowing amount of the blowing port near the high temperature portion is reduced. By controlling the blowing amount, it is possible to operate with the optimum blowing amount.

According to a fifth aspect of the present invention, in the coke dry fire extinguishing equipment according to the third or fourth aspect, the temperature sensor is attached to the obstruction member.

According to the present invention, it is possible to more accurately grasp the flow state of the reheat gas in the pre-chamber and the reforming state of coke.

Further, the present invention relates to a method for producing coke by blowing hot air containing an oxygen-containing gas or a hydrocarbon into a pre-chamber, comprising measuring the temperature of coke in the pre-chamber.
The present invention can also be configured as a coke manufacturing method characterized by controlling the speed at which coke in the spare chamber descends based on the temperature of coke in the spare chamber.

[0020]

FIG. 1 shows a coke dry fire extinguishing system according to a first embodiment of the present invention. In this embodiment, air is blown into the spare chamber as a reheating gas.
The fire extinguisher tower 1 of the coke dry fire extinguishing equipment includes a preparatory room 2 and a cooling room 3. The coke carbonized in the coke oven is charged into the spare room 2 of the dry fire extinguishing equipment. When air is blown into the preliminary chamber 2 after charging the coke, the oxygen in the air reacts with the gas generated from the coke and the coke itself and burns, and the heat generated at that time heats the coke (and the gas). . Thereafter, the coke is cooled by the circulating gas in the cooling chamber 3 and cut out from the cutout. The circulating gas from which the sensible heat of the coke has been recovered and the air introduced into the preliminary chamber 2 are discharged from the fire extinguisher 1, passed through a flue 6 having a dust remover 4 and introduced into a boiler 7. After the circulating gas undergoes heat exchange in the boiler 7, coke breeze in the circulating gas is removed by the cyclones 8,8. Thereafter, the circulating gas is again introduced into the lower part of the fire extinguishing tower 1 by the fan 9.

FIG. 2 and FIG. FIG. 2 is a vertical sectional view of the preliminary chamber 2, and FIG. 3 is a horizontal sectional view of the preliminary chamber 2. The preliminary chamber 2 is provided with baffle members 11 as speed control means for controlling the speed at which coke descends. The baffle members 11 are rod-shaped,
A plurality, for example, four, are provided radially from the center line 2a. The baffle members 11 are arranged at two places on the boiler side and two places on the opposite side of the boiler, for a total of four places. The four obstruction members 11 have the same height, and are installed in the middle of the preliminary chamber 2 in the height direction. The baffle members 11 can move linearly in the axial direction, and advance or retreat toward the center line 2a of the preliminary chamber 2.
In the figure, S indicates the stroke of the baffle members 11. In the actual operation, since the fluctuation of the coke level is indispensable, several obstacles 11 may be installed in the height direction.

A temperature sensor 12 as a temperature measuring means for measuring the temperature of coke in the preparatory chamber is attached to the tip of each of the baffle members 11. For example, an optical fiber is used for the temperature sensor 12 so that the temperature of coke in three directions in the radial direction of the preliminary chamber 2 can be measured at the same time. In addition to the optical fiber, a plurality of thermocouples attached in the circumferential direction of the furnace wall may be used as the temperature sensor 12.

The pre-chamber 2 is provided with a plurality of reheating gas blowing ports 13 as blowing means for blowing air into the pre-chamber 2. The plurality of reheat gas inlets 13 are shown in FIG.
Are arranged on the same circumference as shown in FIG. A flow control valve 15 for adjusting the amount of the reheating gas blown from the reheating gas blowing ports 13 is provided in a pipe between the reheating gas blowing ports 13 and the air blowing fan 14. In addition,
This flow control valve 15 is provided with one reheating gas injection port 13.
Are provided one by one, but one may be provided for two or more reheating gas injection ports 13.

The baffle members 11 control the flow of coke so that the temperature distribution of coke in the furnace becomes uniform based on the measurement values of the temperature sensors 12 installed in the furnace.
In other words, the portion where the temperature is low indicates that the reaction of the reheat gas has not progressed as compared with the portion where the temperature is high, so that the baffle member 11 is advanced. Thereby, the coke descending speed can be reduced, and the coke can be descended after the temperature is sufficiently increased. On the other hand, the portion where the temperature is high is C
In order to suppress the coke reaction deterioration due to the reaction of coke with O ₂ , H ₂ O, etc., the baffle member 11 is retracted to increase the coke descent speed.

At this time, the amount of reheat gas blown from several blowing ports 13 is controlled in accordance with the coke temperature distribution. That is, the blowing amount of the blowing port 13 near the low temperature part is increased, and the blowing amount of the blowing port 13 near the high temperature part is reduced. By controlling the blowing amount of the reheating gas in this way, the operation can be performed with the optimum blowing amount of the reheating gas.

By controlling the lowering speed of the coke and controlling the amount of the reheat gas blown, the deviation with respect to the target reforming effect is minimized with minimum energy, and the uniform reforming effect is obtained. Obtainable. In addition, a local rise in coke temperature and a rise in furnace wall temperature can also be suppressed, and damage to the furnace wall brick can be prevented.

[0027]

FIG. 4 shows the temperature distribution in the furnace in the pre-chamber 2 in the radial direction. FIG. 4 (B) shows the results of measuring the furnace temperature with a baffle member having a temperature sensor, and FIG. 4 (B) shows the case where the flow of coke is controlled by the baffle member with respect to the above results. FIG. 4B shows the measurement results of the furnace temperature when the flow of coke is controlled by the obstruction member and the reheating gas is controlled. P on horizontal axis
1 to P5 represent radial distances (m) from the center of the preliminary chamber 2 shown in FIG. P1 is the center position of the preparatory room 2 and becomes closer to the side wall of the preparatory room toward P5.

From this figure, it can be seen that when the flow of coke is controlled by the obstruction member, the furnace temperature in the radial direction becomes more uniform than when the flow is not controlled. It can be seen that when the flow of coke is controlled by the obstruction member and the reheat gas is controlled, the furnace temperature in the radial direction becomes more uniform.

FIG. 5 shows the furnace temperature distribution in the circumferential direction.
FIG. 5 (B) shows the result of measuring the furnace temperature with a baffle member having a temperature sensor, and FIG. 5 (B) shows the case where the flow of coke is controlled by the baffle member with respect to the above result. FIG. 5B shows the measurement results of the furnace temperature, and FIG. 5B shows the measurement results of the furnace temperature when the flow of coke is controlled by the obstruction member and the reheating gas is controlled. P-S on the horizontal axis is
It shows the circumferential position of the spare chamber shown in FIG.

From this figure, it can be seen that when the flow of coke is controlled by the obstruction member, the temperature in the furnace in the circumferential direction becomes more uniform than when the flow is not controlled. When the flow of coke is controlled by the obstruction member and the reheating gas is controlled, it is understood that the furnace temperature in the circumferential direction becomes more uniform.

FIG. 6 shows the effect of reforming the air blowing amount (CDQ).
It is a graph which shows the relationship of (bottom). In the figure, the thick solid line indicates the average value, and in the figure,-indicates the value of (average value-δ) considering the deviation. Indicates that control is not performed (current state).
Shows the case where only the baffle member is controlled (only the baffle plate), and the figure shows the case where the control of the baffle member and the control of the blowing flow rate are performed (baffle plate + blowing flow rate control).

From this figure, it can be seen that when only the baffle member is controlled, the deviation is smaller at any air blowing amount than when no control is performed. In addition, it can be seen that the deviation is further reduced when the control of the obstruction member and the control of the blowing flow rate are performed.

In the above embodiment, the case where air is used as the reheating gas has been described. However, it is needless to say that hot air containing hydrocarbons, for example, a circulating gas in a CDQ, can be used as the reheating gas.

[0034]

As described above, according to the present invention,
The temperature of coke in the pre-chamber is measured, and based on the temperature of coke in the pre-chamber, the rate at which coke descends in the pre-chamber and the amount of reheat gas injected are controlled, so that the temperature distribution in the furnace is made uniform. As a result, the coke reforming effect can be made uniform with minimum energy.

[Brief description of the drawings]

FIG. 1 is a sectional view of a coke dry-type fire extinguishing facility according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of a spare room of the coke dry fire extinguishing equipment.

FIG. 3 is a horizontal sectional view of a spare room of the coke dry fire extinguishing equipment.

FIG. 4 shows a furnace temperature distribution in the radial direction ((A) in the figure shows a measurement position in the radial direction, and (B) in the figure is a graph of the furnace temperature distribution).

FIG. 5 shows the furnace temperature distribution in the circumferential direction ((A) in the figure shows the measurement position in the circumferential direction, and (B) in the figure is a graph of the furnace temperature distribution).

FIG. 6 is a graph showing a relationship between an air blowing amount and a reforming effect.

[Explanation of symbols]

 2 Preliminary chamber 11 Obstruction member (speed control means) 12 Temperature sensor (temperature measurement means) 13 Blow-out port (blowing means) 15 Flow rate regulating valve

Claims (6)

[Claims] 1. A blowing means for blowing hot air containing an oxygen-containing gas or a hydrocarbon into a preliminary chamber; a temperature measuring means for measuring the temperature of coke in the preliminary chamber; Speed control means for controlling the speed at which the coke in the room descends. 2. An inlet for blowing hot air containing an oxygen-containing gas or a hydrocarbon into the preliminary chamber; a temperature sensor for measuring the temperature in the preliminary chamber; and a side wall of the preliminary chamber, which can move into and out of the preliminary chamber. Coke dry fire extinguishing equipment, comprising: 3. The coke dry fire extinguishing system according to claim 2, wherein a plurality of baffle members are provided radially from a center line of the spare room. 4. The blow-off port is provided in plural numbers in a circumferential direction of the preliminary chamber, and each of the blow-off ports is provided with a flow rate control valve for controlling a blow-in amount. 3. The coke dry-type fire extinguishing equipment according to 3. 5. The coke dry fire extinguishing equipment according to claim 2, wherein the temperature sensor is attached to the baffle member. 6. A method for producing coke by blowing hot air containing an oxygen-containing gas or hydrocarbons into a pre-chamber, comprising: measuring the temperature of coke in the pre-chamber; Controlling the speed at which the coke descends.