JPS6153397B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method and device for igniting diffused gas in coke dry extinguishing equipment, and in particular, a pilot burner is ignited only when igniting the diffused gas, and the diffused gas burns by itself. A coke that extinguishes the pilot burner when the calorie is high, saving the auxiliary combustion gas supplied to the pilot burner, and automatically igniting and extinguishing the pilot burner depending on the presence or absence of the flame of the main burner that burns the diffused gas. This invention relates to a method and device for igniting diffused gas in dry fire extinguishing equipment.

[Prior Art] Figure 1 shows the structure of a typical coke dry extinguishing system. To briefly explain this, 1 has a pre-chamber 2 in the upper part and a cooling chamber 3 in the lower part. The fire tower, 4 is a dust remover, 5 is a boiler, 6 is a cyclone, 7 is a circulation fan,
A circulating gas flow path is configured in which circulating gas is introduced into a fire extinguishing tower 1 to cool red-hot coke in a cooling chamber 3, and the circulating gas heated by the cooling is guided to a boiler 5 for heat recovery. There is.

A lower diffused gas pipe 8 is provided at a position on the gas inlet side of the fire extinguishing tower 1 in the circulating gas flow path, and an upper diffused gas pipe 9 is provided in the pre-chamber 2. The diffused gas discharged from both of the diffused gas pipes mainly consists of N ₂ , CO, CO ₂ and H ₂ and is flammable and harmful. Therefore,
In order to burn this diffused gas and make it harmless, a combustion tube 10 is installed in both the diffused gas pipes 8 and 9 as shown in the figure.
11 are installed in series.

By the way, the components of the emitted gas are unstable, and as the calorie content decreases, it will no longer be able to burn on its own, and the fire will be extinguished if there is no other source of fire, or if the calorie content decreases further, it will burn even if there is another type of flame. Since the flame cannot be maintained, it becomes necessary to perform auxiliary combustion when the calorie is low and to re-ignite when the calorie increases after the diffused gas is extinguished.

Therefore, in the conventional diffused gas ignition device, as shown in FIG.
A pilot burner 15 is provided protruding into the main burner 14. Pilot burner 1
A shutoff valve 17 and a pressure switch 18 are provided in a pipe 16 that supplies combustible auxiliary combustion gas to the fuel cell 5 . Ignition of the pilot burner 15 is performed by an ignition torch burner 19 which is manually operated each time, and ignition combustion of the pilot burner 15 is detected by a pilot burner flame detector 20 provided near the pilot burner 15. This detection signal is sent to a control panel 21 together with the output signal of the pressure switch 18, and the output of the control panel 21 is configured to be applied to the cutoff valve 17. In order to ignite the diffused gas, first, the control panel 21 is operated to open the shutoff valve 17, the auxiliary combustion gas is sent to the pilot burner 15, and the ignition torch burner 19 is ignited at the same time. Next, the ignition torch burner 19 is held up, and the pilot burner 15 continues to be ignited until ignition and combustion occur while monitoring the presence or absence of flame based on the pilot burner flame detector 20 on the control panel 21. When the flame of the pilot burner 15 is confirmed, the ignition torch burner 19 is extinguished, but the combustion of the pilot burner 15 is continued. Therefore, the pilot burner 15 performs auxiliary combustion when the calorie of the diffused gas is low, and re-ignition when the calorie decreases further and the calorie increases again after the calorie is extinguished.

[Problems to be Solved by the Invention] However, in the pilot burner 15, the emitted gas is capable of self-combustion, except when the pressure of the auxiliary gas decreases and the pressure switch 18 is activated to stop the supply of the auxiliary gas. There was a lot of waste because it was constantly being burned, even when the calories were high. In particular, during one cycle from the charging of red-hot coke to the next charging, the period during which the dissipated gas can burn by itself is the third
As shown in the figure, it reaches nearly 90%, so any auxiliary combustion during that time is completely wasted. Generally, coke oven gas is used as the auxiliary combustion gas, but this consumes a large amount of coke oven gas, resulting in increased costs.
Furthermore, if the pilot burner 15 is blown out by strong winds or the like, it is troublesome that a person has to ignite it again with the torch burner 19 in the same way as when igniting the diffused gas described above.

To this end, it is possible to apply a conventionally used general automatic ignition device, but this device does not take into account the calorie fluctuation of the target fuel or the saving of auxiliary fuel, and simply performs automatic ignition. Since there are many such things, they are not useful for the main dissipated gas ignition.

The present invention has been made in view of the above circumstances, and its purpose is to automatically ignite the pilot burner, to extinguish and re-ignite the pilot burner in the presence or absence of flame in the main burner, and to greatly reduce the amount of auxiliary combustion gas used in the pilot burner. An object of the present invention is to provide a method and device for igniting diffused gas in coke dry extinguishing equipment, which can achieve economical savings and labor savings in igniting diffused gas.

[Means for Solving the Problems] The method of the first invention is such that when the emitted gas during combustion is extinguished, the gas supply path to the pilot burner is opened to supply flammable auxiliary combustion gas into the emitted gas. At the same time, the ignition plug is activated to ignite the pilot burner, and then, when the diffused gas is ignited by the flame of the auxiliary combustion gas, the ignition detector detects the ignition, and after the gas supply path is kept open for a predetermined period of time, the gas supply path is kept open. The supply path is closed to stop auxiliary combustion.

Further, the device of the second invention includes a main burner consisting of an outlet of a diffused gas pipe and a combustion tube connected to the outlet and having a larger diameter than the outlet, and a distal end of the main burner, which is disposed within the combustion tube constituting a part of the main burner. A pilot burner that discharges flammable auxiliary combustion gas,
A shutoff valve that cuts off the supply of combustion-assisting gas to the pilot burner, a spark plug that ignites the combustion-assisting gas discharged from the pilot burner, a pilot burner flame detector that detects the flame of the combustion-assisting gas of the pilot burner, and the main burner. a main burner flame detector that detects the flame of the emitted gas; and a control device that outputs a control signal based on the flame presence/absence signals from both of the flame detectors, and the control device performs the control only when there is no flame in the main burner. An opening signal and an ignition signal are applied to the shutoff valve and the ignition plug through the device, and the application is continued only when there is no flame in the pilot burner.

[Function] When igniting and burning the flammable gas released as surplus from coke dry extinguishing equipment,
Only when it is confirmed that the diffused gas has been extinguished, flammable auxiliary combustion gas is supplied into the diffused gas, the auxiliary combustion gas is ignited at the same time as this supply, and the ignition is stopped only when it is confirmed that the auxiliary gas is ignited by this ignition. Then, only when the ignition of the diffused gas by the flame of the auxiliary gas is confirmed, the auxiliary gas is cut off after a predetermined period of time has elapsed since the ignition, and the auxiliary combustion is stopped.After that, the auxiliary gas is allowed to self-combust, so that the diffused gas can ignite on its own. The pilot burner is extinguished to save auxiliary combustion gas when burning high calories, and when the fugitive gas is extinguished, the pilot burner is automatically reignited to ignite the fugitive gas.

[Example] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 is a connection diagram showing an example of a diffused gas ignition device for carrying out the method of the present invention.

As shown in the figure, 23 is a dissipation gas pipe that discharges flammable dissipation gas, and it has an outlet 23a and a combustion tube 2 connected thereto and having a larger diameter than the outlet 23a.
4 and a main burner 25 that burns the gas emitted from the main burner 25.
is configured. A pilot burner 26 is provided in the lower part of the combustion tube 24, which constitutes a part of the main burner 25, near the outlet 23a of the diffused gas pipe. The tip of the pilot burner 26 is provided so as to face the center of the combustion tube 24. A spark plug 27 for igniting the pilot burner 26 and a pilot burner flame detector 28 for monitoring whether or not the pilot burner 26 is ignited are provided near its tip.

A pipe 29 is connected to the pilot burner 26 for supplying combustible auxiliary combustion gas, such as coke oven gas. A cutoff valve 30 is located in the middle of the piping 29 and cuts off the supply of combustion assisting gas by a control signal.
and a pressure switch 31' that operates when the pressure of the auxiliary combustion gas falls below a predetermined value.
The spark plug 27 also includes an igniter 3 that receives a control signal and supplies power to the spark plug to generate a spark.
2 are connected.

Further, as shown in the figure, a main burner flame detector 3 is located in the middle of the combustion tube 24 and monitors the presence or absence of ignition of the main burner 25, that is, the presence or absence of a flame of emitted gas.
3 is provided. The output of the main burner flame detector 33 is connected to the control device 34 along with the outputs of the pilot burner flame detector 28 and pressure switch 31. This control device 34 is operated by an ignition push button switch 36 and an extinguishing push button switch 37 of an operating switch 35 connected thereto, and sends a control signal to the cutoff valve 30 and igniter 32 based on the flame presence signal or pressure signal. It also has the function of sending a signal to the display 38 to light and sound the pilot burner ignition lamp, main burner ignition lamp, pilot burner extinguishing lamp, and alarm buzzer provided on the display. Further, the control device 34 is provided with three timer circuits, one is an n-minute timer that maintains combustion of the pilot burner 26 for an arbitrary set time after ignition of the main burner 25, and two are Three are m-second timers that determine whether or not the main burner 25 is ignited after a predetermined period of time has elapsed after ignition, and three f-second timers that require a predetermined time to confirm whether the main burner 25 is extinguished.

Next, the operation of the diffused gas ignition device having the above structure will be explained according to the flowchart shown in FIG.

Ignition push button switch 3 of operation switch 35
When 6 is pressed, the control device 34 outputs an open signal and an ignition signal. The open signal opens the shutoff valve 30 and supplies combustion assisting gas to the pilot burner 26. The ignition signal is generated by continuously operating the igniter 32 while the ignition pushbutton switch 36 is pressed.
produce a spark. When the pilot burner 26 is ignited, the flame is detected by the pilot burner flame detector 28 and the pilot burner ignition lamp of the indicator 38 is lit via the control device 34. By this lighting, it is possible to confirm the ignition of the auxiliary gas, and then when the ignition push button switch 36 is released, an extinguishing signal is output from the control device 34 and the igniter 3
2 is deactivated, and the spark plug 27 is automatically stopped. If the pilot burner 26 does not ignite,
The pilot burner flame detector 28 does not detect a flame, and the no-flame signal issues an ignition failure warning to the display 38 via the control device 34. Therefore, while the alarm is being issued, the ignition pushbutton switch 36 must be held down, and this process is repeated until the pilot burner 26 ignites. In this way, in this embodiment, the ignition push button switch 36 is activated at the time of starting.
However, instead of this, it is also possible to use a start switch so that the above operation is automatically performed by turning it on only once.

When the pilot burner 26 is ignited, an m-second timer is activated, and after m seconds (for example, 10 seconds) have elapsed, the main burner flame detector 33 determines whether or not the main burner 25 is ignited. If the diffused gas is not ignited within m seconds, the control device 34 receives the no-flame signal from the main burner flame detector 33 and issues an extinguishing alarm from the display 38, and continues this m-second cycle until the main burner 25 ignites. repeat. Therefore, when the calorific value of the emitted gas is extremely low and is in a non-flammable state, the pilot burner 26 is activated as shown in FIG.
continues to burn. The reason why m seconds is set here is to ensure sufficient ignition time for the diffused gas. When the main burner 25 is ignited smoothly due to the high calorific value of the emitted gas, the control device 34 receives a flame presence signal from the main burner flame detector 25 and lights up the main burner ignition lamp on the display 38. at the same time n
After activating the minute timer and continuing combustion in the pilot burner 26 for n minutes (for example, 1 to 10 minutes), a cutoff signal is output to the cutoff valve 30 to close it, stop the supply of combustion assisting gas, and turn off the pilot burner 26. The pilot burner extinguishing lamp on the extinguishing indicator 38 is turned on. By extinguishing the pilot burner 26, the main burner 25 starts to self-combust only the diffused gas. The reason for setting n minutes here is as follows. That is, when the calorie content of the diffused gas is low, if the main burner 25 is re-ignited and then the pilot burner 26 is immediately extinguished, the diffused gas may not be able to burn itself and the fire may be extinguished. To prevent this, the pilot burner 26 assists combustion for n minutes after the main burner 25 is re-ignited.

When checking the ignition of the main burner 25 using the main burner flame detector 33, there is a risk that the flame of the pilot burner 26 will be detected because the pilot burner 26 is burned out. Since it is provided in the middle of the cylinder 24 and sufficiently separated from the pilot burner 26 provided at the bottom, there is no risk of malfunction. In addition,
As both flame detectors 28 and 33, flame current detection means using a known flame rod, heat detection means using infrared rays, temperature detection means using a thermocouple, etc. are suitable.

After the self-combustion of the diffused gas continues, the calorie of the diffused gas decreases and the main burner 25 is extinguished, and in response to the signal from the main burner flame detector 33, the control device 34 operates the f seconds timer, After waiting for 5 seconds and confirming that the fire is completely extinguished, an open signal is output again to the shutoff valve 30, which is opened to supply auxiliary combustion gas to the pilot burner 26. Then, the igniter 32 is operated to ignite the ignition plug and relight the pilot burner 26. The pilot burner 26 burns continuously until the calorific value of the emitted gas increases and is re-ignited. It is assumed that extinguishing of the main burner 25 occurs more frequently during ignition in a low-calorie state that requires auxiliary combustion, rather than after stable self-combustion of the diffused gas as described above. Providing this is also important in terms of eliminating unstable intermittent operation of the shutoff valve 30 and the spark plug 27.

Therefore, a flame detector 33 is provided in the main burner 25 to detect the presence or absence of a flame in the main burner 25, and a control device 34 is provided to ignite and extinguish the pilot burner 26 based on the presence or absence of this flame. When there is a flame, shut off valve 30
The main burner 2
When the diffused gas of No. 5 has a high calorie and can be combusted by itself, the fuel of the auxiliary combustion gas can be saved.In particular, since the diffused gas accounts for a large proportion of the total when the calorie is high, the amount of savings is extremely large.

Further, the control device 34 controls the pilot burner 26 for an arbitrary set time (n minutes) after ignition of the main burner 25.
Equipped with an n-minute timer that keeps burning the
Even during unstable transient times when the calorie of the emitted gas increases, it is possible to reliably ignite and burn the gas.

Further, the control device 34 includes a shutoff valve 30 that cuts off the supply of combustion supporting gas based on the presence/absence signals of the pilot burner flame detector 28 and the main burner flame detector 33, a spark plug 27 that ignites the pilot burner 26, and an igniter 32. Since the control is performed, the ignition of the diffused gas can be easily automated, and even if the fire is extinguished or blown out, there is no need for human intervention.

The second flowchart shown in FIG. 5 is for maintenance of the pilot burner 26. That is, when it is desired to continuously stop combustion of the pilot burner 26, the fire extinguishing push button switch 37 of the operation switch 35 is turned on. This ON
Therefore, the shutoff valve 30 will not open even if the main burner 25 is extinguished. Therefore, there is no danger of auxiliary combustion gas being discharged during maintenance, such as when the nozzle of the pilot burner 26 becomes clogged.
Safety can be ensured.

Note that the fire extinguishing push button switch 37 of the operating switch 35 is not essential, since this can also be prevented by other means such as discharging auxiliary gas during maintenance.

[Effects of the Invention] In summary, the present invention exhibits the following excellent effects.

(1) By igniting and extinguishing the pilot burner depending on the presence or absence of the main burner's flame, the pilot burner can be extinguished during high-calorie situations where the emitted gas can burn continuously on its own, allowing for significant savings in pilot burner fuel.

(2) The ignition control of the diffused gas can be easily automated, allowing for accurate control and labor savings.
In particular, since the supply of the auxiliary combustion gas is continued for a predetermined period of time after the ignition of the diffused gas, the ignition and combustion of the diffused gas can be reliably performed.

(3) Without making any major changes to the existing equipment, all you need to do is add a new main burner flame detector and pilot burner ignition means and install a control device incorporating a sequential circuit in the control panel. It can be simplified.

[Brief explanation of the drawing]

Figure 1 is a schematic overall configuration diagram of coke dry extinguishing equipment, Figure 2 is a connection diagram of a conventional diffused gas ignition system,
Fig. 3 is a schematic change characteristic diagram during one cycle of the emitted gas calories discharged from the coke dry extinguishing equipment, Fig. 4 is a connection diagram showing a preferred embodiment of the emitted gas ignition device according to the present invention, and Fig. 5 is a flowchart showing the operating procedure of the device. In the figure, 23 is a diffused gas pipe, 23a is an outlet of the diffused gas pipe, 24 is a combustion tube, 25 is a main burner, 26 is a pilot burner, 27 is a spark plug, 2
8 is a pilot burner flame detector, 30 is a shutoff valve, 33 is a main burner flame detector, and 34 is a control device. .

Claims (1)

[Scope of Claims] 1. When the flammable diffused gas released as surplus from the diffused gas pipe of the coke dry fire extinguishing equipment is extinguished. At the command, the gas supply path to the pilot burner is opened to supply flammable auxiliary combustion gas into the diffused gas, and the ignition plug is operated until the pilot burner is ignited to ignite the pilot burner, and then the ignited auxiliary combustion gas is The gas supply path is kept open for a predetermined period of time after the emitted gas is ignited by the flame and the ignition detector detects the ignition, and then the gas supply path is closed to stop the auxiliary combustion. Method for igniting diffused gas in coke dry extinguishing equipment. 2. In a coke dry fire extinguishing system that has a diffused gas pipe that discharges flammable diffused gas, the main burner consists of an outlet of the diffused gas pipe and a combustion tube connected to the outlet and has a larger diameter than the outlet; a pilot burner whose tip faces into the combustion cylinder forming a part of the combustion cylinder from which flammable auxiliary gas is discharged; a shutoff valve that cuts off the supply of combustible gas to the pilot burner; An ignition plug for igniting the auxiliary combustion gas, an operating means such as an igniter for operating the ignition plug, a pilot burner flame detector for detecting the flame of the auxiliary combustion gas of the pilot burner, and a flame of the dissipated gas of the main burner. The main burner flame detector includes a main burner flame detector, an indicator that displays an operating state, an operation switch that starts operation when operated, and a control device, the control device operating the operation switch or controlling the main burner flame detector. detects extinguishing of the diffused gas, applies an opening signal to the shutoff valve, and operates the actuating means until the pilot burner flame detector detects a flame of the auxiliary gas to apply an ignition signal to the ignition plug. means for activating a timer when the main burner flame detector detects a flame of the dissipated gas, and means for continuously applying an open signal to the shutoff valve while the timer is activated; A dissipated gas ignition device for coke dry extinguishing equipment, characterized in that it comprises means for applying a display signal to the indicator to display the status each time.