JP2010216118A - Fire extinguishing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely extinguish a fire without causing external fire spreading during fire extinguishing. <P>SOLUTION: In an asphalt recycling plant, a burner 14 is arranged at one end of a rotatable drum 10, and an asphalt pavement waste material carried into the drum 10 is regenerated by being overheated by a burner 14. A gas fire-extinguishing device 26 emits fire extinguishing gas from a gas head 32 into the drum 10 in case of fire, and extinguishes the fire by suffocation. Concurrently with that, water fire-extinguishing equipment 28 brings about a cooling effect by spraying water, supplied in a pressurized state onto the outer surface of the drum 10, from a water head 56. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a fire extinguishing facility that extinguishes a fire in an asphalt regeneration plant that regenerates asphalt pavement waste carried in a drum by heating it with a burner.

  Conventionally, in an asphalt recycling plant that regenerates asphalt pavement waste, a burner is disposed at one end of a rotating drum, and the asphalt pavement waste carried into the drum is overheated and regenerated by the burner ( Patent Documents 1 and 2).

  However, if the asphalt pavement waste is heated too high by the heat of the burner, the asphalt will ignite and a fire will occur. Once a fire breaks out, it is very difficult to extinguish the oil-containing asphalt, and if it takes time to extinguish the fire, it may lead to a situation where the fire spreads throughout the plant. Thus, a fire extinguishing method and apparatus for an asphalt regeneration plant has been proposed (Patent Document 3).

JP-A-4-202903 Japanese Patent Laid-Open No. 10-77603 JP-A-6-316905

  However, in a conventional fire extinguisher for an asphalt regeneration plant, fire is extinguished by spraying water from a fire extinguishing head into a drum containing asphalt, but the drum only needs to be completely sealed. If not completely sealed, asphalt containing oil flows by water spray and leaks to the outside, which may cause fire spread.

An object of the present invention is to provide a fire extinguishing equipment for an asphalt regeneration plant that can surely perform fire extinguishing without incurring external fire spread during fire extinguishing.

The present invention provides a fire extinguishing equipment that extinguishes a fire in an asphalt regeneration plant in which a burner is disposed at one end of a rotatable drum and the asphalt pavement waste material carried into the drum is heated by the burner to regenerate.
A gas fire extinguishing device that extinguishes suffocation by releasing a fire extinguishing gas into the drum in the event of a fire,
Water fire extinguishing equipment that sprays and cools water supplied under pressure to the outer surface of the drum in the event of a fire,
Is provided.

  Here, a water fire extinguishing equipment arrange | positions the water receiving tank which accumulates the water sprayed on the outer surface of the drum and immerses a part of drum around the drum.

  The gas fire extinguishing equipment emits nitrogen gas or carbon dioxide gas as a fire extinguishing gas.

In the gas fire extinguishing equipment, a gas head is arranged in a storage tank connected to the asphalt recovery side of the drum to discharge the fire extinguishing gas, and the drum is filled with the fire extinguishing gas via the storage tank.

  According to the present invention, in the event of a fire, a fire extinguishing gas is put into the drum to extinguish the fire by suffocation, and at the same time, water is sprayed on the outer surface of the drum and the drum is covered with water to cool and extinguish the fire. The fire can be reliably extinguished by the suffocation action and the cooling action.

  In addition, since no water is put into the drum, it is possible to reliably prevent the asphalt having an oil component from flowing through the water and leaking to the outside to cause a fire spread.

  In addition, when extinguishing a fire extinguishing gas into the drum, the inside of the drum and the storage tank connected to the drum is sealed or exhausted using an exhaust device to the extent that it does not explode. Can fully demonstrate.

  In addition, the water spray on the outer surface of the drum may be sprayed from anywhere on the top, bottom, or side. Furthermore, by placing a water receiving tank around the drum and storing the sprayed water, a part of the drum surface is immersed in water for efficient cooling. can do.

Also, without disposing a gas head in the drum, the head is disposed in a storage tank that communicates with the drum to release the fire extinguishing gas, and the drum is filled with the fire extinguishing gas through the storage tank. The gas head can be prevented from being damaged by hot air, and the fire extinguishing gas can be surely put into the drum.

Explanatory drawing which showed embodiment of the fire extinguishing equipment of the asphalt reproduction plant by this invention Explanatory drawing which showed arrangement | positioning of the water receiving tank with respect to the drum cooled with the water sprayed from the head Explanatory drawing which showed other embodiment of arrangement | positioning of the water head with respect to a drum Explanatory drawing which showed other embodiment of the water fire extinguishing apparatus in this invention

  FIG. 1 is an explanatory view showing an embodiment of a fire extinguishing facility for an asphalt regeneration plant according to the present invention.

  In FIG. 1, the asphalt regeneration plant has a drum 10 rotatably disposed on a machine base 12 via a roller 16 driven by a motor (not shown), and a flame is blown into the drum 10 on the right side of the drum 10. A burner 14 for heating is disposed, and a conveyor 18 for carrying the crushed asphalt pavement waste material is disposed.

  A storage tank 20 is disposed on the left side of the drum 10, and asphalt regenerated by overheating by the burner 14 of the drum 10 is collected and stored. The upper part of the storage tank 20 is connected to a dust collector 22 to collect and remove dust and exhaust gas generated by heating the asphalt pavement waste material and release it to the atmosphere. The storage tank 20 is provided with a thermometer 24 using a thermocouple so that the internal temperature can be monitored.

  In the asphalt regeneration process, the flame is sent into the drum 12 by the burner 14 while the drum 10 is rotated, and the asphalt pavement waste material is carried into the drum 10 by the conveyor 18. Blades are formed on the inner peripheral wall of the drum 10, and the carried waste material is scraped up by the blades and sent to the outlet side while rolling, and is heated by receiving hot air from the burner 14 during that time, The molten asphalt is collected in the storage tank 20.

  As the fire extinguishing equipment of this embodiment, a gas fire extinguishing device 26 and a water fire extinguishing device 28 are provided. The gas fire extinguishing equipment 26 arranges a plurality of storage containers 30 such as gas cylinders containing nitrogen gas or carbon dioxide gas as a fire extinguishing gas, arranges a gas head 32 inside the storage tank 20 of the asphalt regeneration plant, and stores the storage container 30. And the gas head 32 are connected by a gas pipe 34.

  An activation device 36 is provided for the storage container 30. The activation device 36 includes a container containing a pressurized gas for activation and an activation valve that is opened by a control signal, and supplies the high-pressure gas for activation to the storage container 30 to open the container valve.

  A gate valve 38 is provided in the middle of the gas pipe 34, and an open / close detector 40 such as a limit switch is provided for the gate valve 38 so that the open / close state of the gate valve 38 can be determined by the fire extinguishing control panel 60. Yes. Further, a pressure switch 42 is provided on the secondary side of the gate valve 38, and the fire pressure is extinguished by the fire extinguishing control panel 60 by detecting the gas pressure when the extinguishing gas is supplied from the storage container 30 to the gas head 32 by the operation of the starter 36. Gas emission can be confirmed.

  The storage tank 20 in which the gas head 32 is disposed communicates with the inside of the drum 10, and the fire extinguishing gas discharged from the gas head 32 enters the drum 10 through the storage tank 20. Here, if the gas head is arranged directly in the drum 10, there is a high possibility that the gas head is damaged by being exposed to the hot air from the burner 14. Therefore, in this embodiment, the gas head is arranged in the storage tank 20 having a low ambient temperature. The head 32 is prevented from being damaged, and the fire extinguishing gas can be surely released.

  Next, the water fire extinguisher 28 will be described. The water fire extinguisher 28 is provided with a pump 44 that pressurizes and supplies the water stored in the water source water tank 46, and the pump 44 is driven by a motor 48 that is controlled by a pump control panel 50. A plurality of water heads 56 are arranged around the drum 10 of the asphalt regeneration plant. In the present embodiment, the water heads 56 are arranged in the longitudinal direction of the upper portion of the drum 10, but may be any position on the drum 10 in the vertical and horizontal directions.

  The pump 44 and the water head 56 are connected by a water pipe 52, and an open / close control valve 54 such as a pressure reducing simultaneous open valve is provided in the water pipe 52. Further, a water receiving tank 62 is disposed at the lower part of the drum 10.

  FIG. 2 is an explanatory view showing the arrangement of the water receiving tank 62 with respect to the drum 10, and the lower part of the drum 10 is arranged in the water receiving tank 62. For this reason, the water sprayed from the water head 56 accumulates in the water receiving tank 62, and the drum 10 is immersed in the accumulated water so as to obtain high cooling efficiency. The water receiving tank 62 may have a length that covers the entire longitudinal direction of the drum 10, and the entire drum 10 may be cooled by a single water receiving tank.

  The gas fire extinguishing device 26 and the water fire extinguishing device 28 are controlled by a fire extinguishing control panel 60. A manual activation device 58 installed in the vicinity of the drum 10 is connected to the fire extinguishing control panel 60 by signal lines.

  The fire extinguishing control device 60 incorporates a processor as a control unit, and performs fire extinguishing control by executing a program by the processor. The fire extinguishing control by the fire extinguishing control device 60 is started by receiving a start signal by the operation of the manual start device 58 when a fire occurs in the drum 10.

  The fire extinguishing control by the fire extinguishing control device 60 operates by outputting a control signal to the starting device 36, supplies the starting high-pressure gas to the storage container 30, opens the container valve, and extinguishes the gas pipe 34 by supplying the soot. The fire extinguishing gas is discharged from the gas head 32 of the tank 20 into the tank. The fire extinguisher released into the storage tank 20 enters the fired drum 10 and fills the fire extinguishing gas.

  When the fire extinguishing gas is released, the inlet side of the drum 10 is closed to seal the inside so that the fire extinguishing gas released from the gas head 32 does not leak, or the explosion occurs due to expansion of the fire extinguishing gas due to heat in the drum 10. Exhaust operation of the dust collector 22 is performed to such an extent that no dust is generated. Thus, the fire extinguishing by the choking action is performed by filling the drum 10 with the fire extinguishing gas.

  Here, when the fire extinguishing control panel 60 activates the gas fire extinguishing device 26 in a state where the gate valve 38 is closed, an alarm is given based on the closing detection signal from the opening / closing detector 40 that the gate valve 38 is in the closed state. . When fire extinguishing gas is supplied to the gas pipe 34 by starting the gas fire extinguishing device 26, a pressure detection signal is obtained from the pressure switch 42 to confirm and display the release of the fire extinguishing gas.

  At the same time, the fire extinguishing control device 60 sends a start signal to the pump control panel 50 of the water fire extinguishing device 28, drives the motor 48 to start the operation of the pump 44, and pressurizes and supplies water from the water source water tank 46 to the water pipe 52. To do. At the same time, the fire extinguishing control device 60 sends an open control signal to the open / close control valve 54 to open it.

  For this reason, the water supplied under pressure from the pump 44 is supplied to a water head disposed around the drum 10, sprays water on the outer surface of the drum 10, and covers the periphery of the drum 10 with the sprayed water. The drum 10 causing a fire inside is cooled by the spray of water from the water head 56, and the fire is extinguished by a cooling action for lowering the internal temperature.

  Further, the water sprayed from the water head 56 flows into and accumulates in a water receiving tank 62 installed at the lower part of the drum 10, and the lower part of the drum 10 is immersed in the water stored in the water receiving tank 62, and is further efficiently cooled. The normally rotating drum 10 stops the rotation of the drum in order to cut off the electrical supply and to prevent the solidified asphalt cooled by fire extinguishing from rotating in the drum. Naturally, the burner 14 is stopped in conjunction with the start of the fire extinguishing device or the fire detection of the fire alarm equipment arranged in the plant.

  The fire in the drum 10 is surely fired at the initial stage of the fire without spreading to the outside by the suffocation action by the fire extinguishing gas put in the drum 10 and the cooling action of the drum 10 by spraying water from the water head 56. Can be extinguished.

  FIG. 3 is an explanatory view showing another embodiment of the arrangement of the water head with respect to the drum of the asphalt regeneration plant.

  FIG. 3A shows the drum 10 in a plan view, and a plurality of water heads 56 are arranged on both sides of the drum 10 to spray water.

  FIG. 3B shows the drum 10 in a plane, and a plurality of water heads 56 are arranged back to back in the center of the drum 10 toward both ends to spray water.

  FIG. 3C shows a cross section of the drum 10. Water heads 56 are arranged obliquely upward on both sides of the lower part of the drum 10, and water is sprayed from the lower part of the drum 10.

  Of course, it is good also as arrangement | positioning of the water head 56 which combined FIG. 3 (A)-(C).

  FIG. 4 is an explanatory view showing another embodiment of the water fire extinguishing apparatus used in the fire extinguishing equipment of the present invention. The water fire extinguisher 28 in FIG. 4 has a water storage tank 64 installed at a position higher than the drum 10 of the asphalt regeneration plant. The water storage tank 64 has a tank capacity for storing an amount of water that can be sufficiently cooled against a fire in the drum 10. The water piping 66 drawn out from the water storage tank 64 is connected to a plurality of water heads 56 disposed on the upper portion of the drum 10 via an opening / closing control valve 68.

  The open / close control valve 88 is controlled to open by a control signal from the fire extinguishing control panel 60 shown in FIG. 1 in the event of a fire of the drum 10, and the water stored in the water storage tank 64 is supplied to the water head 56 through the water pipe 66. Spray on to cool.

  According to such a water fire extinguishing apparatus 28, the apparatus configuration is simplified and the equipment cost can be reduced as compared with the water fire extinguishing equipment using the pump equipment of FIG.

  In the above embodiment, an example is given in which the operating person determines that a fire has occurred and operates the on-site manual activation device 58 to activate the gas fire extinguishing device 26 and the water fire extinguishing equipment 28. It may be activated by operating an activation button or the like provided at 60. Alternatively, the gas fire extinguishing device 26 and the water fire extinguishing equipment 28 may be automatically activated by determining that a predetermined fire temperature has been exceeded from a detection signal from a temperature sensor installed in the drum 10 or the like.

  Further, the gas fire extinguishing device 26 and the water fire extinguishing equipment 28 can be started and stopped separately, and either one of the fire extinguishing devices is started according to the fire situation, or after one fire extinguishing device is started, the other fire extinguishing device is started. You may perform sequential starting which provided the time lag of starting an apparatus.

Further, the present invention includes appropriate modifications that do not impair the object and advantages thereof, and is not limited by the numerical values shown in the above embodiments.

10: Drum 12: Machine base 14: Burner 16: Roller 18: Conveyor 20: Storage tank 22: Dust collector 24: Thermometer 26: Gas fire extinguishing device 28: Water fire extinguishing device 30: Storage container 32: Gas head 34: Gas piping 35 : Safety device 36: Activation device 38: Gate valve 40: Opening and closing detector 42: Pressure switch 44: Pump 46: Water tank 48: Motor 50: Pump control panel 52: Water piping 54: Opening and closing control valve 56: Water head 58: Manual starter 60: Fire extinguishing control panel 62: Receiving tank 64: Water storage tank

Claims (4)

In a fire extinguishing equipment that extinguishes a fire in an asphalt regeneration plant in which a burner is disposed at one end of a rotatable drum and the asphalt pavement waste material carried into the drum is overheated and regenerated by the burner.
A gas fire extinguisher that extinguishes suffocation by discharging a fire extinguishing gas into the drum in the event of a fire;
Water fire extinguishing equipment that sprays and cools water supplied under pressure to the outer surface of the drum in the event of a fire;
Fire extinguishing equipment characterized by providing
The fire-extinguishing equipment according to claim 1, wherein the water-fire-extinguishing equipment includes a water receiving tank around the drum for storing water sprayed on the outer surface of the drum and immersing a part of the drum. Special fire extinguishing equipment.
The fire extinguishing equipment according to claim 1, wherein the gas fire extinguishing equipment emits nitrogen gas or carbon dioxide gas as a fire extinguishing gas.
  2. The fire extinguishing equipment according to claim 1, wherein the gas fire extinguishing equipment disposes a fire gas by disposing a gas head in a storage tank connected to the asphalt recovery side of the drum, and passes through the storage tank. The fire extinguishing equipment is characterized in that the drum is filled with a fire extinguishing gas.

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