JP2004067825A - Method for controlling flow rate of circulating gas in coke dry quencher and device for controlling flow rate of circulating gas - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for controlling a flow rate of a circulating gas in a coke dry quencher (CDQ) which permits to keep the temperature of the circulating gas at an inlet of a boiler at a specified temperature or higher and to carry on an energy-saving operation even when the amount of the discharged coke from the CQD main body fluctuates, and a device for controlling the flow rate of the circulating gas. <P>SOLUTION: In the gas circulating method in the CDQ which comprises charging a red-hot coke discharged from a coke oven into the CQD main body 1, blowing a cooling gas thereby contacting the cooling gas with the red-hot coke in the CDQ main body 1 to raise the temperature of the cooling gas, conveying the temperature-raised gas to a boiler 3 to recover the heat of the temperature-raised gas thereby converting it to a cooling gas and re-circulating it to reuse as the cooling gas for the CDQ main body 1, the number of revolution of a circulating blower 7 for introducing the circulating gas after cooled into the CDQ main body is controlled according to the discharged amount of the coke discharged from the CDQ main body. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a circulating gas flow control method and a circulating gas flow control device in a coke dry quencher (hereinafter, referred to as CDQ) in a coke dry quencher.
[0002]
[Prior art]
In the CDQ, red hot coke is charged into the pre-chamber of the CDQ main body, lowered into the cooling chamber, and an inert gas, which is a cooling gas supplied to the cooling chamber, exchanges heat with the red hot coke to recover the heat of the red hot coke. After introducing the inert gas into the boiler and exchanging heat, the circulation gas is again sent to the cooling chamber by the circulation blower and circulated. Steam obtained by heat exchange in the boiler is sent to a generator and collected as electric energy.
[0003]
In the conventional CDQ, when the discharged coke amount (CDQ processed amount) is reduced, the circulating gas temperature at the boiler inlet becomes lower than a predetermined temperature (about 800 ° C.) unless the circulating gas flow rate is also reduced. As a countermeasure, as described in JP-A-5-140562, air is blown into the pre-chamber of the CDQ body to burn combustible gas in the circulating gas. The temperature of the circulating gas was raised by the process.
[0004]
[Problems to be solved by the invention]
However, in the method described in Japanese Patent Application Laid-Open No. 5-140562, it is necessary to provide an air blowing device for the CDQ main body, so that there is a problem that the equipment cost is increased and the energy consumption of the equipment is increased.
[0005]
The problem to be solved by the present invention is that even if the amount of coke discharged from the main body of the CDQ fluctuates, the circulating gas temperature at the boiler inlet can be maintained at a predetermined temperature or higher, and the circulating gas flow rate control of the CDQ enables energy saving operation. A method and a circulating gas flow control device are provided.
[0006]
[Means for Solving the Problems]
The present invention has solved the above-mentioned problem by controlling the number of revolutions of a circulation blower that introduces the cooled circulation gas into the CDQ main body in accordance with the amount of coke discharged from the CDQ main body.
[0007]
That is, in the method of controlling the circulation gas flow rate of the CDQ of the present invention, the red hot coke discharged from the coke oven is charged into the CDQ main body, the cooling gas is blown, and the cooling gas and the red hot coke are brought into contact in the CDQ main body. A method of circulating a CDQ gas, in which a cooling gas is heated, and the heated gas is conveyed to a boiler to recover heat of the heating gas to be used as a cooling gas, circulated again and reused as a cooling gas for the CDQ body. Wherein the number of rotations of a circulating blower that introduces the cooled circulating gas into the CDQ body is controlled in accordance with the amount of coke discharged from the CDQ body.
[0008]
The circulating gas flow control device used in the circulating gas flow control method according to the present invention includes a weighing device for measuring the weight of coke discharged from the main body of the CDQ, and a discharged coke based on the measured value of the discharged coke weight by the weighing device. A discharged coke weight control device for controlling the weight, and the discharged coke weight control device calculates a required circulating gas flow rate to be introduced into the CDQ main body based on the measured value of the discharged coke weight by the weight measuring device. And a rotation speed control device for controlling the rotation speed of a circulation blower for introducing the circulation gas into the CDQ main body according to the circulation gas flow rate measured by the circulation gas flow rate measurement device arranged in the circulation duct. The rotation speed control device is preferably an inverter that controls the rotation speed of the motor of the circulation blower.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples shown in the drawings.
[0010]
FIG. 1 is a flowchart showing an embodiment of the present invention. The upper part of the CDQ main body 1 into which red-hot coke is charged and exchanges heat with an inert gas as a cooling gas for cooling is connected to a boiler 3 by an exhaust duct 2. Further, the boiler 3 is connected to a lower portion of the CDQ main body 1 by a circulation duct 4 via a circulation blower 7. By this connection, the high-temperature inert gas heat-exchanged with the red hot coke in the CDQ main body 1 is exhausted from the CDQ main body 1, introduced into the boiler 1 through the exhaust duct 2, cooled by the heat exchange, and circulated by the circulation blower 5. An inert gas circulation path, which is introduced into the CDQ main body 1 through the duct 4, is formed.
[0011]
A discharged coke vibrating feeder 11 controlled by a vibrating feeder control device 12 is provided at a lower portion of the CDQ main body 1. 13 is discharged. The discharged coke weighing conveyor 13 is provided with a weight measuring device 14. Based on the discharged coke weight measured by the weight measuring device 14, the discharged coke weight control device 15 controls the vibrating feeder control device 12 to discharge the coke. Control coke weight.
[0012]
In the circulation duct 4, a cyclone for dust removal is provided between the boiler 3 and the circulation blower 7, and an orifice 6 for measuring a circulation gas flow rate is provided downstream of the cyclone. The circulating gas flow rate measured by the orifice 6 is input to the circulating gas flow control device 10. The required circulating gas flow rate calculated by the discharged coke weight control device 15 based on the measured value of the discharged coke weight is also input to the circulating gas flow control device 10, and the circulating gas flow control device 10 The calculated difference signal from the required circulating gas flow rate is transmitted to the inverter 9, and the inverter 9 controls the rotation speed of the circulation blower motor 8 based on the difference signal so that the circulating gas flow rate becomes the required circulating gas flow rate. Control.
[0013]
FIG. 2 is a diagram showing the relationship between the discharged coke weight and the required circulating gas flow rate. The relationship as shown in the figure is obtained in advance, and the required circulating gas flow rate corresponding to the measured value of the discharged coke weight is calculated by the discharged coke weight control device 15 as described above. The number of revolutions of the circulation blower motor 8 is controlled so that the required circulation gas flow rate is obtained. By performing such control, as shown in FIG. 3, the circulating gas flow rate can be increased or decreased in accordance with the increase or decrease in the discharged coke weight, and the circulating gas temperature at the boiler inlet can always be maintained at a predetermined temperature or higher. .
[0014]
In the above embodiment, as the rotation speed control device for controlling the rotation speed of the circulation blower, an inverter for controlling the rotation speed of the circulation blower motor was used. However, another rotation speed control device, for example, a circulation using a fluid coupling. A blower speed control may also be used. However, since the fluid coupling changes the rotation speed on the outlet side of the coupling and does not change the rotation speed of the circulation blower motor, the rotation speed of the circulation blower motor cannot be changed with respect to the load of the circulation blower. Therefore, from the viewpoint of energy saving, it is preferable to use an inverter for controlling the rotation speed of the circulation blower motor.
[0015]
【The invention's effect】
In the present invention, the rotation speed of the circulation blower that introduces the cooled circulation gas into the CDQ main body is controlled according to the amount of coke discharged from the CDQ main body, so that even if the weight of coke discharged from the CDQ main body fluctuates. The temperature of the circulating gas at the boiler inlet can be maintained at a predetermined temperature or higher. In addition, since it is not necessary to provide an air blowing device for the CDQ main body as in the related art, energy saving operation is possible.
[Brief description of the drawings]
FIG. 1 is a flowchart showing an embodiment of the present invention.
FIG. 2 is a diagram showing a relationship between a discharged coke weight and a required circulating gas flow rate.
FIG. 3 is a diagram showing a relationship between a discharged coke weight and a circulating gas flow rate in the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 CDQ main body 2 Exhaust duct 3 Boiler 4 Circulating duct 5 Cyclone 6 Orifice 7 Circulating blower 8 Circulating blower motor 9 Circulating blower inverter 10 Circulating gas flow control device 11 Discharge coke vibration feeder 12 Vibration hood feeder control device 13 Discharge coke weighing conveyor 14 Weight measuring device 15 Weight control device for discharged coke

Claims (2)

The red hot coke discharged from the coke oven is charged into the main body of the CDQ, a cooling gas is blown into the main body, and the cooling gas and the red hot coke are brought into contact in the main body of the CDQ to raise the temperature of the cooling gas. In a gas circulation method for a CDQ, the heat is transferred to a boiler to recover the heat of the heat-up gas to be used as a cooling gas, circulated again, and reused as a cooling gas for the CDQ body.
A method of controlling a circulating gas flow rate of a CDQ, wherein the number of rotations of a circulating blower that introduces the cooled circulating gas into the CDQ main body is controlled in accordance with the amount of coke discharged from the CDQ main body. The red hot coke discharged from the coke oven is charged into the main body of the CDQ, a cooling gas is blown into the main body, and the cooling gas and the red hot coke are brought into contact in the main body of the CDQ to raise the temperature of the cooling gas. In a CDQ gas circulating device that is conveyed to a boiler, recovers the heat of the heat-up gas, converts it into a cooling gas, circulates it again, and reuses it as a cooling gas for the CDQ body,
A weight measuring device for measuring the weight of coke discharged from the main body of the CDQ,
A discharged coke weight control device for controlling the discharged coke weight based on the measured value of the discharged coke weight by the weight measuring device;
The discharged coke weight control device calculates a required circulating gas flow rate to be introduced into the CDQ body based on the measured value of the discharged coke weight by the weighing device, and calculates the calculated value and the circulating gas flow rate provided in the circulation duct. A circulating gas flow control device for a CDQ, wherein a circulating gas flow rate control device for controlling the number of rotations of a circulating blower for introducing circulating gas into a CDQ main body based on the circulating gas flow rate measured by the device.

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