JP2799659B2 - Fire extinguishing method and apparatus in dryer for recycling waste material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for extinguishing a fire generated in a waste material regeneration dryer for heating and recycling asphalt pavement waste material.

[0002]

2. Description of the Related Art Asphalt pavement waste material (hereinafter referred to as "waste material") excavated by road construction has asphalt components attached thereto, and when this waste material is heated and regenerated by a dryer for regenerating waste material, the waste material gradually builds up on the inner wall of a drum. When the exhaust gas is temporarily heated to a high temperature, for example, when the supply of the waste material to the dryer is stopped, the deposited waste material may catch fire and a fire may occur in the drum.

Conventionally, in such a case, when an operator confirms an abnormally high exhaust gas temperature by looking at an exhaust gas temperature indicator on an operation panel, the burner is extinguished, and when it is confirmed that black smoke is emitted from a dryer, it is determined that a fire has occurred. They approached the dryer with a fire extinguisher and a hose for water discharge, and injected fire extinguisher and water into the dryer to perform fire fighting.

[0004]

However, there is a problem in terms of quickness if the fire extinguisher or the water discharge hose was run to the dryer in the emergency of a fire, and the fire extinguishing activity was performed at the source of the fire. In addition, there was also a great mental burden in monitoring and responding to fires of operators.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a method and an apparatus for extinguishing a fire in a waste material regenerating dryer capable of safely and easily extinguishing a fire generated in the dryer by remote control. I do.

[0006]

According to the present invention, there is provided a fire extinguishing nozzle for a fire extinguisher in which water or a fire extinguisher is sprayed by being exposed to the inside of a drum of a waste material regenerating dryer for heating and regenerating waste material. Along with disposing, an exhaust gas temperature detection sensor is disposed downstream of the dryer, and it is determined that a fire has occurred when the exhaust gas temperature detected by the exhaust gas temperature detection sensor is equal to or higher than a preset fire occurrence exhaust gas temperature,
It is characterized in that the fire is extinguished by spraying water or a fire extinguisher from the fire extinguishing nozzle by manual or automatic operation remotely based on a fire occurrence alarm.

Further, as an apparatus to which the above fire extinguishing method is applied, a fire extinguishing nozzle of a fire extinguisher that sprays water or a fire extinguisher while facing the inside of a drum of a waste material regenerating dryer for heating and regenerating waste material is provided. A fire-extinguishing system is provided downstream of the dryer, wherein an exhaust gas temperature detecting sensor for detecting the temperature of the exhaust gas is provided, and when the temperature of the exhaust gas detected by the sensor for detecting the exhaust gas temperature becomes equal to or higher than a preset exhaust gas temperature at which a fire occurs, the fire extinguishing device is activated. It is characterized by having a controller.

Further, an opening / closing damper for opening / closing an exhaust gas passage is disposed in an exhaust flue downstream of the dryer drum, and exhaust gas is released to the atmosphere in an exhaust gas passage upstream of a mounting position of the opening / closing damper. And an exhaust gas flow controller for closing the open / close damper when a fire occurs in the drum and simultaneously opening the exhaust gas open cover.

[0009]

According to the present invention, the exhaust gas temperature is sequentially detected by the exhaust gas temperature sensor disposed downstream of the dryer during the operation of the waste material regenerating dryer, and when the exhaust gas temperature exceeds a preset fire-producing exhaust gas temperature, the internal temperature of the dryer is reduced. When it is determined that a fire has occurred, the burner combustion is stopped, and an alarm provided in the operation room is activated to notify the operator of the fire. Then, based on the alarm, the operator remotely controls the fire extinguishing controller, or automatically operates the fire extinguishing controller to spray the fire extinguishing agent or water toward the inside of the drum from the fire extinguishing nozzle that faces the inside of the drum. Then, the inside of the drum is filled with a fire extinguishing agent or water vapor to drive out combustion oxygen and extinguish the fire.

Further, when a fire occurs in the drum, the exhaust gas flow path controller is automatically operated to close the open / close damper of the exhaust flue so that the sparks do not flow out to the downstream of the dryer to protect the dust collector downstream of the dryer. At the same time, the exhaust gas opening lid is opened, and the exhaust gas inside the drum, which expands rapidly, is diffused into the atmosphere while being filled with a fire extinguishing agent and water vapor to expel oxygen for combustion to expedite the fire.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a waste material regenerating dryer for heating and regenerating the waste material, which rotatably inclines and supports a cylindrical drum 2 by a supporting roller 4 on a machine base 3 and a predetermined device by a driving device (not shown). Rotating at speed. 5 is drum 2
A hot hopper provided at one end of the combustion chamber 7 for forming a flame generated from a burner 6 in the hot hopper 5.
Are linked.

The hot air generated by the burner 6 is sent into the drum 2 from the hot hopper 5 side, and a blower (at the end of an exhaust flue 9 connected to a cold hopper 8 provided at the other end of the drum 2) Exhaust gas is sucked by a not-shown) to maintain a gas flow passing through the inside of the drum 2, and the exhaust gas passes through a dust collector (not shown) downstream of the drum and is discharged into the atmosphere.

Reference numeral 10 denotes a waste material charging chute for charging waste material into the drum 2. The waste material charged into the drum 2 from the waste material charging chute 10 rolls down the drum 2 while flowing down the drum. It comes into contact with the passing hot air, is heated to a desired temperature, and is discharged from a waste material discharge port 11 below the cold hopper 8.

The exhaust flue 9 is provided with an exhaust gas temperature detecting sensor 12 for detecting the exhaust gas temperature, and an opening / closing damper 14 for opening and closing the exhaust gas passage by operating a damper switch 13. Further, the cold hopper 8 is provided with an exhaust gas opening lid 16 which is opened and closed by the operation of the lid opening / closing device 15 and releases the gas filling the drum to the atmosphere.
The exhaust gas temperature detection sensor 12, damper switch 13 and lid switch 15 are connected to a fire extinguishing controller 17 and an exhaust gas flow controller 18 installed in a remote control room of the plant.

Exhaust gas temperature data detected by the exhaust gas temperature detecting sensor 12 is sequentially taken into a fire extinguishing controller 17, and the exhaust gas temperature data is compared with a preset fire exhaust gas temperature. When the temperature of the generated exhaust gas becomes equal to or higher than that, it is determined that a fire has occurred, and the drive of the damper switch 13 and the lid switch 15 is controlled via the exhaust gas flow path controller 18 so that the open / close damper 14 is closed and the exhaust gas opening cover 16 is opened at the same time. The control procedure is programmed to

The dryer 1 for regenerating waste material is provided with a fire extinguisher 19 for extinguishing a fire in the drum. The fire extinguisher 19 includes a fire extinguishing nozzle 20 facing an appropriate position inside the drum, a water source or a fire extinguisher cylinder 22 connected to the fire extinguishing nozzle 20 via a pipe 21, and a pump provided in the middle of the pipe 21. 23 and a control valve 24. The control valve 24 is controlled by a fire extinguishing command signal from the fire extinguishing controller 17.
Is opened, and the pump 23 is driven to spray water or a fire extinguisher from the fire extinguishing nozzle 20.

The fire extinguishing controller 17 is provided with an alarm device 25 for issuing an alarm when the temperature of the exhaust gas detected by the exhaust gas temperature detecting sensor 12 becomes higher than the preset exhaust gas temperature at which the fire occurred and it is judged that a fire has occurred. 26 flashes and an alarm buzzer 27 sounds to notify the operator of the occurrence of a fire. Fire extinguishing controller 17
Is provided with an operation unit 28 containing switches for manually operating and automatically controlling the fire extinguisher 19 based on the operation of the alarm 25.

Next, the procedure of a fire extinguishing method in the waste material recycling dryer 1 will be described. First, the fire extinguishing controller 17 is set in advance via the operation unit 28 with the temperature of the fire-producing exhaust gas for determining that a fire has occurred in the drum 2. In addition, this temperature setting is, for example, to set the fire exhaust gas temperature to about 250 ° C, and to start the fire extinguishing when the exhaust gas temperature becomes equal to or higher than the fire exhaust gas temperature. Separately, the exhaust gas abnormal set temperature is set to about 230 ° C. It is preferable to set a two-step control method in which the burner 6 stops burning when the temperature becomes equal to or higher than the exhaust gas abnormal set temperature.

When the operation of the dryer 1 is started, the temperature of the exhaust gas derived from the dryer 1 is constantly detected by the exhaust gas temperature detecting sensor 12 inserted in the exhaust flue 9 and is taken into the fire extinguishing controller 17. Check constantly to see if it exceeds the temperature of the exhaust gas.

When the exhaust gas temperature detected by the exhaust gas temperature detecting sensor 12 exceeds the exhaust gas abnormal set temperature, the combustion of the burner 6 is stopped. When the exhaust gas temperature further rises and becomes higher than the fire-producing exhaust gas temperature, It is determined that a fire has occurred in the drum 2 and the alarm lamp 2 of the alarm 25
7 is turned on and the alarm buzzer 27 is sounded.

At this time, the operation unit 2 of the fire extinguishing controller 17
If the switch No. 8 is set to the manual operation side, the operator determines whether or not fire extinguishing is necessary based on the issuance of a fire alarm, and presses the fire extinguishing button of the operation unit 28 when judging that fire extinguishing is necessary. As a result, the pump 23 of the fire extinguisher 19 is driven and the water control valve 24 is opened to spray water or a fire extinguisher into the drum 2.

Simultaneously with the start of the fire extinguishing, the damper switch 13 is actuated by a control command from the exhaust gas flow path controller 18 to close the open / close damper 14, and the open / close damper 1 is closed.
The blockage of 4 prevents soot and sparks from flowing to the side of the bag filter, which is a dust collector downstream of the exhaust flue 9, and prevents the bag filter from burning. If the inside of the drum 2 is closed, there is a risk of gas explosion. Therefore, the lid switch 15 is also operated to open the exhaust gas release lid 16.

The water sprayed into the drum 2 expands as steam and expels the air in the drum 2 from the exhaust gas opening cover 16 to lower the oxygen concentration in the drum 2, thereby extinguishing the fire.

Since the fire can be extinguished by expelling the air in the drum by spraying water or a fire extinguishing agent to lower the oxygen concentration in the drum, the spray amount of the water or the fire extinguishing agent can be adjusted to the optimum amount of spray. Preferably, the spray amount can be calculated to some extent by calculation.

Therefore, if a fire occurs, the pump 23
Then, the control valve 24 is driven or opened for a predetermined time to spray a predetermined amount of water or a fire extinguisher. Then, it is determined whether or not the fire has been extinguished by the decrease in the exhaust gas temperature. If the exhaust gas temperature does not decrease, a predetermined amount of water or a fire extinguisher is sprayed again. This operation is repeated until the temperature of the exhaust gas falls to extinguish the fire. With such a fire extinguishing method, damage due to water or a fire extinguishing agent in the drum 2 after the fire extinguishing is completed can be minimized, and restarting is possible in a short time.

In the above procedure, the fire extinguishing operation was performed manually by the operator. However, when the switch of the operation unit 28 is set to the automatic side, the fire extinguishing operation is automatically performed to extinguish the fire in the drum. Have to be able to.

[0028]

As described above, according to the present invention, a fire extinguisher 19 for spraying water or a fire extinguisher onto the inside of the drum 2 is provided.
A fire extinguishing nozzle 20 is provided, and an exhaust gas temperature detecting sensor 12 is provided downstream of the dryer 1. When the exhaust gas temperature detected by the exhaust gas temperature detecting sensor 12 becomes equal to or higher than a preset fire generating exhaust gas temperature, a fire occurs. The burner was stopped upon judgment, and water or fire extinguishing agent was sprayed from the fire extinguishing nozzle 20 manually or automatically from a remote location based on a fire alarm, so that the fire occurring in the drum 2 was remotely controlled. The fire can be extinguished more safely and easily.

Further, an opening / closing damper 14 for opening and closing the exhaust gas passage is disposed in the exhaust flue 9 of the dryer 1, and an exhaust gas for opening the exhaust gas to the atmosphere is provided in an exhaust gas passage upstream of the mounting position of the opening / closing damper 14. Arrange the open lid 16,
When a fire occurs in the drum 2 and water or a fire extinguishing agent is sprayed from the fire extinguishing nozzle 20, the opening / closing damper 14 is closed and the exhaust gas opening cover 16 is opened at the same time. Burnout of the bag filter can be prevented, and the air in the drum 2 can be expelled by opening the exhaust gas release cover 16 to expedite fire extinguishing.

[Brief description of the drawings]

FIG. 1 is a schematic view showing one embodiment of the present invention.

[Description of sign]

DESCRIPTION OF SYMBOLS 1 ... Dryer for waste material regeneration 2 ... Drum 9 ... Exhaust flue 12 ... Sensor for exhaust gas temperature detection 14 ... Opening / closing damper 16 ... Exhaust gas opening lid 19 ... Fire extinguishing device 17 ... Fire extinguishing controller 20 ... Fire extinguishing nozzle

Claims (3)

(57) [Claims] 1. A fire extinguishing nozzle for a fire extinguisher for spraying water or a fire extinguishing agent facing a drum of a waste material regenerating dryer for heating and regenerating waste material, and an exhaust gas temperature detecting sensor downstream of the dryer. It is determined that a fire has occurred when the exhaust gas temperature detected by the exhaust gas temperature detection sensor is equal to or higher than a preset fire occurrence exhaust gas temperature, and the fire extinguishing is performed manually or automatically from a remote location based on a fire occurrence alarm. A fire extinguishing method in a waste material recycling dryer, wherein water or a fire extinguisher is sprayed from a nozzle. 2. A fire extinguisher nozzle for a fire extinguisher for spraying water or a fire extinguisher facing the inside of a drum of a waste material regenerating dryer for heating and regenerating waste materials, and an exhaust gas for detecting an exhaust gas temperature downstream of the dryer. A waste material comprising a temperature detection sensor, and a fire extinguishing controller for activating the fire extinguisher when the exhaust gas temperature detected by the exhaust gas temperature detection sensor becomes equal to or higher than a preset fire exhaust gas temperature. Fire extinguisher in regenerative dryer. 3. An open / close damper for opening and closing an exhaust gas passage in an exhaust flue downstream of a drum of the dryer.
An exhaust gas release cover for releasing exhaust gas to the atmosphere is disposed in an exhaust gas flow path upstream of the mounting position of the open / close damper, and further, when a fire occurs in the drum, the open / close damper is closed and the exhaust gas open cover is simultaneously opened. The fire extinguishing system for a waste material regeneration dryer according to claim 2, further comprising an exhaust gas flow path controller.