JP5443112B2 - Gas-liquid mixing equipment and fire extinguishing control method for gas-liquid mixing equipment - Google Patents

Description

The present invention relates to a gas-liquid mixing facility that simultaneously releases and extinguishes nitrogen gas and fine spray during a fire in an enclosed space, and a fire- extinguishing control method for the gas-liquid mixing facility .

  Traditionally speaking, gas-based fire extinguishing equipment was the Halon 1301 fire extinguishing equipment, but as a result of the Montreal Protocol concerning substances that destroy the ozone layer, it was decided that production of halon gas would be discontinued and restricted use as a fire extinguishing agent Has been applied. Along with this, carbon dioxide fire extinguishing equipment has become the mainstream as an alternative equipment, but because it has a high global warming potential, it is addictive and adversely affects the human body, environmentally friendly nitrogen gas fire extinguishing equipment is the mainstream in Japan. It is becoming.

  However, because nitrogen gas fire extinguishing equipment is a suffocation fire due to a decrease in oxygen concentration, the amount of nitrogen gas released is larger than other gas fire extinguishing equipment, and securing the installation location of gas cylinders when installing in existing facilities is a problem. It has become.

  On the other hand, a fine spray fire extinguishing equipment (water mist fire extinguishing equipment) is known as a water-based fire extinguishing equipment in a sealed space. Fine spray fire extinguishing is a facility with a small amount of water and a high fire extinguishing effect due to combined actions such as water cooling effect, remarkable cooling effect due to vaporization heat of fine spray, suffocation effect due to vaporized water vapor, and blocking effect due to water film formation, Research is ongoing.

  However, even with water spray fire extinguishing equipment, there is a limit to reducing the amount of water, and spraying may surface as a large amount of water droplets within a few minutes after release, which may cause water loss. Then, there is a problem that there are things that can not be extinguished due to combustion.

  In order to solve such a problem, a gas-liquid mixed type fire extinguishing facility that simultaneously discharges nitrogen gas and water spray to a sealed space has been proposed (Patent Document 1).

JP 2007-050149 A

  However, in such conventional gas-liquid mixing type fire extinguishing equipment, nitrogen gas and fine spray are simultaneously emitted from the gas nozzle and fine spray nozzle, but the particle diameter of water discharged from the nozzle is 10 to 10. Since it is as fine as 200 μm, it cannot be sufficiently blown, and it is affected by the momentum of the release of nitrogen gas from the gas nozzle.

  In addition, it is desirable that the nitrogen gas is released until the oxygen concentration is sufficiently lowered, for example, 12 to 13%, and extinguishing the suffocation. However, if the oxygen concentration is lowered to such a low oxygen concentration, the section should be separated. If a person remains inside, safety cannot be ensured, and the oxygen concentration can only be reduced to a concentration that can ensure safety.

1st invention of this application provides the gas-liquid mixing fire extinguishing equipment which improves the fire-extinguishing efficiency by radiation | emission of the fine water spray performed after discharge | release of nitrogen gas, and the fire extinguishing control method of a gas-liquid mixing equipment .

Another object of the second invention of the present application is to provide a gas / liquid mixing fire extinguishing facility and a fire extinguishing control method for the gas / liquid mixing facility that can ensure safety even when the oxygen concentration is sufficiently lowered by releasing nitrogen gas.

(First invention)
The present invention provides a gas-liquid mixed fire extinguishing equipment,
A gas nozzle that releases nitrogen gas into a protective space in a sealed compartment;
A fine spray nozzle that mixes and discharges water fine spray with a particle size of 10 μm to 200 μm and nitrogen gas;
First, a control device that releases nitrogen gas from the gas nozzle to lower the oxygen concentration in the compartment, and then mixes nitrogen gas from the fine spray nozzle to release fine water spray,
Is provided.

  Here, the control device releases nitrogen gas from the gas nozzle for a predetermined time, and then discharges water fine spray mixed with nitrogen gas from the fine spray nozzle for a predetermined time.

The present invention
A gas nozzle that releases nitrogen gas into a protective space in a sealed compartment;
In a fire-extinguishing control method for a gas-liquid mixing facility comprising a fine water spray having a particle size of 10 μm to 200 μm and a fine spray nozzle for mixing and releasing nitrogen gas,
First, nitrogen gas is released from the gas nozzle to lower the oxygen concentration in the compartment, and then nitrogen gas is mixed from the fine spray nozzle to release fine water spray.

  Here, after releasing nitrogen gas from the gas nozzle for a predetermined time, fine water spray mixed with nitrogen gas is discharged from the fine spray nozzle for a predetermined time.

(Second invention)
The present invention provides a gas-liquid mixed fire extinguishing equipment,
A gas nozzle that releases nitrogen gas into a protective space in a sealed compartment;
A fine spray nozzle for mixing and discharging water fine spray with a particle size of 10 μm to 200 μm and compressed air;
A control device that first releases nitrogen gas from the gas nozzle, and then releases water fine spray mixed with compressed air from the fine spray nozzle;
Provided,
The controller releases nitrogen gas from the gas nozzle to reduce the oxygen concentration in the compartment to a concentration that can extinguish asphyxiation, and then discharges a fine water spray mixed with compressed air from the fine spray nozzle to release the oxygen concentration in the compartment. Is recovered to a concentration capable of ensuring the safety of the human body .

Here, the control device, the oxygen concentration in the compartment to release the nitrogen gas from the gas nozzle after low Do of about 12% to 13%, by emitting mixed water atomized with compressed air from the atomization nozzle The oxygen concentration in the compartment is restored to about 16% to 17%.

The present invention
A gas nozzle that releases nitrogen gas into a protective space in a sealed compartment;
A fine spray nozzle for mixing and discharging water fine spray with a particle size of 10 μm to 200 μm and compressed air ;
In the fire extinguishing control method of the gas-liquid mixing equipment equipped with
After releasing nitrogen gas from the gas nozzle to reduce the oxygen concentration in the compartment to a concentration that can be extinguished by suffocation , discharge fine water spray mixed with compressed air from the fine spray nozzle to reduce the oxygen concentration in the compartment to human safety A fire extinguishing control method for a gas-liquid mixed fire extinguishing facility, characterized in that the concentration is restored to a secure level .

Here, the oxygen concentration in the compartment to release the nitrogen gas from the gas nozzle after low Do of about 12% to 13% oxygen in the compartment by releasing the mixed water atomized with compressed air from the atomization nozzle The concentration is restored to about 16% to 17%.

  According to the first invention of the present application, first, nitrogen gas is released from the gas nozzle to lower the oxygen concentration in the compartment, and then the release of nitrogen gas from the gas nozzle is stopped and nitrogen gas is mixed from the fine spray nozzle. Since the fine water spray is released, even if fine water particles, it is possible to fly a sufficient distance by mixing the nitrogen gas without being influenced by the gas nozzle side, and the fine water particles released can be dispersed throughout the compartment. A sufficient fire extinguishing effect can be obtained.

  Also, according to the second invention of the present application, first, nitrogen gas is released from the gas nozzle to lower the oxygen concentration in the compartment, and then the fine water spray containing mixed compressed air is discharged from the fine spray nozzle to recover the oxygen concentration. Therefore, even if there is a person in the compartment, the oxygen concentration is greatly reduced by releasing nitrogen gas and extinguishing the suffocation, and then by releasing fine water spray mixed with compressed air. By restoring the oxygen concentration, safety to the human body can be ensured.

In addition, the first invention combines the release of nitrogen gas and the release of water fine spray, thereby reducing the amount of nitrogen gas released at one time, reducing the space for installing the gas cylinder, and the amount of water sprayed by water fine spray. Can also reduce water damage.

Explanatory drawing which showed embodiment of the fire extinguishing equipment to which the gas-liquid mixed fire extinguishing method of 1st invention of this application is applied The flowchart which showed the fire extinguishing control by the control apparatus of FIG. Explanatory drawing which showed embodiment of the fire extinguishing equipment to which the gas-liquid mixed fire extinguishing method of 2nd invention of this application is applied The flowchart which showed the fire extinguishing control by the control apparatus of FIG.

  FIG. 1 is an explanatory view showing an embodiment of fire extinguishing equipment to which the gas-liquid mixed fire extinguishing method according to the first invention of the present application is applied. In FIG. 1, a sealed protective compartment 10 to be extinguished is, for example, an electric room, a computer room, an office, etc., and a fire sensor 26 connected to a sensor line drawn from the control panel 24 is installed. Yes.

  A gas nozzle 12 that discharges nitrogen gas and a fine spray nozzle 14 that discharges fine water spray are installed in the protective compartment 10. A gas cylinder 16 filled with nitrogen gas is connected to the gas nozzle 12 by a gas pipe 28 via an electric valve 18.

  The piping from the gas cylinder 16 is further connected to the fire extinguishing agent container 22 by the gas piping 30 through the motor-operated valve 20. The fire extinguisher container 22 stores a fire extinguishing liquid in a state where vaporization is suppressed in a sealed state by mounting a sealing lid. Two gas pipes 30 for supplying nitrogen gas via the motor-operated valve 20 and a fire extinguisher pipe 32 from the fire extinguisher container 22 are connected to the fine spray nozzle 14.

  The fire extinguishing liquid in the extinguishant container 22 is supplied with nitrogen gas from the gas pipe 30 and is pressurized and supplied to the fine spray nozzle 14 to be discharged as fine spray. At this time, the nitrogen gas directly supplied to the fine spray nozzle 14 and Upon mixing, a fine spray is released.

  The average particle diameter of the fine spray discharged from the fine spray nozzle 14 is 10 μm to 200 μm. In this case, the smaller the particle size, the longer the time of fine spray staying in the space of the protective compartment 1 and the greater the fire extinguishing effect. Practically, a fine spray that occupies most of the particle diameter of 10 μm to 50 μm is released.

  Further, since the generated fine spray is mixed with nitrogen gas and released, the generated fine spray can be sufficiently skipped and can be finely sprayed and dispersed throughout the protective compartment 10.

The control plate 24 is operated by an automatic operation based on a fire detection signal from the fire detector 26 or a manual operation on the control panel 24 to perform gas-liquid mixed fire extinguishing on the protection section 10.

  The fire extinguishing control by the control panel 24 starts with the opening control of the motor-operated valve 18 to release nitrogen gas from the gas nozzle 12 from the gas nozzle 12 for a predetermined time, for example, one minute to lower the oxygen concentration in the protective compartment, and then turn the motor-operated valve 18 on. After the release control of the nitrogen gas from the gas nozzle 12 is stopped, the motor-operated valve 20 is controlled to be opened, and the nitrogen gas is supplied from the cylinder 16 to the fire extinguisher container 22 and the fine spray nozzle 14. The fire extinguishing liquid is pushed out by the gas pressure of the gas and pressurized and supplied to the fine spray nozzle 14 to generate a fine spray. The generated fine spray is mixed with nitrogen gas and released into the protective space 10 for a predetermined time, for example, one minute. To do.

  FIG. 2 is a flowchart showing fire extinguishing control by the control panel 24 of FIG. In FIG. 2, first, in step S1, the presence or absence of a fire detection or manual activation operation from the fire detector 26 is determined, and if a fire detection or manual activation operation is determined, the process proceeds to step S2 to notify the start of gas-liquid mixed fire extinguishing. When a predetermined start-up standby time has elapsed in step S3, the process proceeds to step S4, where the motor-operated valve 18 is controlled to open, and nitrogen gas is supplied from the gas cylinder 16 to the gas nozzle 12 to be released into the protective space 10. .

  Subsequently, if it is determined in step S5 that a predetermined time has elapsed during the release of the nitrogen gas, the process proceeds to step S6, and the release of the nitrogen gas from the gas nozzle 12 is stopped by the closing control of the motor operated valve 18.

Subsequently, in step S7, nitrogen gas from the cylinder 16 is supplied to the fire extinguisher container 22 and the fine spray nozzle 14 by opening control of the control valve 20, and the fire extinguisher is pushed out from the fire extinguisher container 22 with the nitrogen gas pressure. The water is sprayed to generate fine water spray, mixed with nitrogen gas and released into the protective space.

  Subsequently, when it is determined in step S8 that the predetermined time has elapsed, the process proceeds to step S9, and the release of the fine water spray mixed with nitrogen gas is stopped by closing control of the motor-operated valve 20.

  According to such gas-liquid mixed fire extinguishing in FIG. 1, the nitrogen gas extinguishing concentration required for extinguishing suffocation in the protection section 10 is 40.3%, whereas for example, nitrogen gas in the case of releasing in 1 minute. The nitrogen gas release concentration was reduced by 25% to 60%, and the subsequent fine water spray by mixing the nitrogen gas was performed for 1 minute, thereby reducing the overall nitrogen gas release amount and the gas cylinder. The installation space of 16 can be reduced, and at the same time, the amount of water fine spray discharged can be reduced, and the water damage damage to the equipment installed in the protection section 10 can be minimized.

  FIG. 3 is an explanatory view showing an embodiment of fire extinguishing equipment to which the gas-liquid mixed fire extinguishing method according to the second invention of the present application is applied. In FIG. 3, a control panel 24 is installed for the sealed protective compartment 10 to be extinguished, and a fire sensor 26 provided in the protective compartment 10 is connected by a sensor line.

  A gas nozzle 12 that discharges nitrogen gas and a fine spray nozzle 14 that discharges fine water spray are installed in the protective compartment 10. A gas cylinder 16 filled with nitrogen gas is connected to the gas nozzle 12 by a gas pipe 28 via an electric valve 18.

For atomization nozzle 14, the extinguishing agent pipe 32 and the air pipe 34 from the extinguishing agent container 22 is connected, an air pipe 3 4 is further branched connection extinguishing agent container 22.

  The fire extinguisher container 22 stores a fire extinguishing liquid in a state where vaporization is suppressed in a sealed state by mounting a sealing lid. The fire extinguishing liquid is supplied by the air pipe 34 and the fire extinguishing liquid is finely sprayed by the fire extinguisher pipe 32. Pressure is supplied to the nozzle 14 to generate fine water spray. At this time, since the compressed air is simultaneously supplied to the fine spray nozzle 14, the generated fine water spray is mixed with the compressed air and discharged.

  The average particle size of the fine water spray discharged from the fine spray nozzle 14 is 10 μm to 200 μm. In this case, the smaller the particle size, the longer the time of water fine spray staying in the space of the protective compartment 1 and the greater the fire extinguishing effect. Practically, a fine water spray with a particle size of about 10 μm to 50 μm occupying most is discharged.

  Further, since the generated fine water spray is mixed with the compressed air and discharged, the generated fine water spray can be sufficiently skipped, and the fine water spray can be dispersed throughout the protective compartment 10.

The control plate 24 is operated by an automatic operation based on a fire detection signal from the fire detector 26 or a manual operation on the control panel 24 to perform gas-liquid mixed fire extinguishing on the protection section 10.

  In the fire extinguishing control by the control panel 24, first, nitrogen gas is discharged from the gas nozzle 12 from the gas nozzle 12 for a predetermined time, for example, 1 minute by opening control of the motor-operated valve 18 to lower the oxygen concentration in the protective compartment. The oxygen concentration lowered by the release of nitrogen gas is, for example, about 12 to 13%.

  Next, after the release of nitrogen gas from the gas nozzle 12 is stopped by closing the motor-operated valve 18, the motor-operated valve provided in a compressed air supply facility including a compressor (not shown) is opened and compressed air is supplied by the air pipe 34. Then, the fire extinguishing liquid is pushed out from the fire extinguisher container 22 by compressed air and pressurized and supplied to the fine spray nozzle 14 to generate a fine water spray. The generated fine water spray is mixed with the compressed air for a predetermined time, for example, 1 The oxygen is discharged to the protective space 10 over a period of time and extinguished by fine water spray, and at the same time, the oxygen concentration is restored to a concentration necessary for ensuring the safety of the human body, for example, about 16 to 17%.

FIG. 4 is a flowchart showing fire extinguishing control by the control panel 24 of FIG. In FIG. 4 , first, in step S11, the presence or absence of a fire detection or manual activation operation from the fire detector 26 is determined, and if a fire detection or manual activation operation is determined, the process proceeds to step S12 to notify the start of gas-liquid mixed fire extinguishing. When a predetermined start-up standby time has elapsed in step S13, the process proceeds to step S14, where the motor-operated valve 18 is controlled to open, and nitrogen gas is supplied from the gas cylinder 16 to the gas nozzle 12 to be released into the protective space 10. .

  Subsequently, when it is determined in step S15 that a predetermined time has elapsed during the release of the nitrogen gas, the process proceeds to step S16, and the release of the nitrogen gas from the gas nozzle 12 is stopped by the closing control of the motor operated valve 18.

Subsequently, in step S17, compressed air is supplied to the fire extinguisher container 22 and the fine spray nozzle 14 through the air pipe 34, the fire extinguisher is extruded from the fire extinguisher container 22 with compressed air pressure, and pressurized to the fine spray nozzle 14 to supply water. A spray is generated and mixed with the directly supplied compression zone and released into the protective space.

  Subsequently, when it is determined in step S18 that the predetermined time has elapsed, the process proceeds to step S19, and the discharge of the fine water spray mixed with the compressed air is stopped by stopping the supply of the compressed air.

  According to the gas-liquid mixed fire extinguishing in FIG. 3 as described above, the nitrogen gas extinguishing concentration of nitrogen gas necessary for extinguishing the suffocation in the protection section 10 is 40.3%, whereas the nitrogen gas in the case where it is released in one minute, for example The discharge concentration of nitrogen gas is reduced by 25% to 45%, and the discharge of fine water spray by mixing compressed air is performed for 1 minute. Thus, the installation space of the gas cylinder 16 can be reduced, and at the same time, the amount of water fine spray discharged can be reduced, and the damage caused by water damage to the equipment installed in the protection section 10 can be minimized.

  In addition, the oxygen concentration in the protective compartment 10 is lowered to about 12 to 13%, which is dangerous for the human body by the release of nitrogen gas, and the suffocation is extinguished by the nitrogen gas. Next, the release of the nitrogen gas is stopped and the water is sprayed finely. Since the oxygen concentration is restored to about 16-17%, which is necessary for ensuring the safety of the human body, by releasing the gas mixed with compressed air, nitrogen gas is released in the presence of a person in the protective zone. However, the safety of the human body can be ensured by recovering the oxygen concentration in a short time.

  In addition, the discharge time of the nitrogen gas and water fine spray by the gas-liquid mixed fire extinguishing method of the present invention is not limited to 1 minute shown in the above-described embodiment, and can be arbitrarily constant as short as possible. What is necessary is just to be able to eject nitrogen gas and water fine spray reaching the concentration required for time.

  Further, in the above embodiment, when the control panel starts the gas-liquid mixed fire extinguishing, a warning is given during the start standby time, but in the case of a manual start operation, there is no person in the protective section. Therefore, it is not necessary to perform alarm output over the start-up standby time.

  In addition, the extinguishing agent stored in the extinguishing agent container 22 has higher electrical resistivity than pure water if pure water or distilled water is used, and may cause electric leakage when discharged into a clean room or an electric room. Secondary disaster can be prevented.

The present invention includes appropriate modifications without impairing the object and advantages thereof, and is not limited by the numerical values shown in the above embodiments.

10: Protective compartment 12: Gas nozzle 14: Fine spray nozzle 16: Gas cylinder 18, 20: Motorized valve 22: Extinguishing agent container 24: Control panel 26: Fire detector 28, 30: Gas piping 32: Extinguishing agent piping 34: Air piping

Claims (4)

A gas nozzle that releases nitrogen gas into a protective space in a sealed compartment;
A fine spray nozzle for mixing and discharging water fine spray with a particle size of 10 μm to 200 μm and compressed air;
A control device that first discharges nitrogen gas from the gas nozzle and then discharges water fine spray mixed with compressed air from the fine spray nozzle;
Provided,
The control device releases nitrogen gas from the gas nozzle to reduce the oxygen concentration in the compartment to a concentration capable of suffocation and extinguishes, and then discharges a fine water spray mixed with compressed air from the fine spray nozzle. A gas-liquid mixed fire extinguishing system that restores the oxygen concentration in the compartment to a concentration that can ensure the safety of the human body .

In gas-liquid mixing firefighting equipment according to claim 1, wherein the control device, after low Do the oxygen concentration in the compartment to release the nitrogen gas from the nozzle to approximately 12% to 13%, the fine A gas-liquid mixed fire extinguishing system which discharges a fine water spray mixed with compressed air from a spray nozzle to restore the oxygen concentration in the compartment to about 16% to 17%.
A gas nozzle that releases nitrogen gas into a protective space in a sealed compartment;
A fine spray nozzle for mixing and discharging water fine spray with a particle size of 10 μm to 200 μm and compressed air ;
In the fire extinguishing control method of the gas-liquid mixing equipment equipped with
After releasing nitrogen gas from the gas nozzle to reduce the oxygen concentration in the compartment to a concentration capable of suffocating and extinguishing , oxygen fine concentration in the compartment is released from the fine spray nozzle by releasing fine water spray mixed with compressed air. Is restored to a concentration capable of ensuring the safety of the human body .

In claim 3 extinguishing control method for gas-liquid mixing extinguishing equipment according, the oxygen concentration in the compartment to release the nitrogen gas from the gas nozzle after low Do of about 12% to 13%, the atomization A fire extinguishing control method for gas-liquid mixing fire extinguishing equipment, characterized in that a fine water spray mixed with compressed air is discharged from a nozzle to restore the oxygen concentration in the compartment to about 16% to 17%.

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