JP4745309B2 - Extinguishing apparatus and extinguishing method for hydrogen-oxygen mixed gas combustion apparatus - Google Patents

Description

  The present invention relates to an apparatus and method for extinguishing combustion gas combustion without causing backfire from the burner to a gas source in a combustion apparatus for supplying a hydrogen-oxygen mixed gas to a burner to burn the mixed gas. is there.

  The present inventor has proposed a mixed gas generator of hydrogen and oxygen using electrolysis in Japanese Patent Application No. 2006-187245.

  Such a hydrogen-oxygen mixed gas is extremely useful because it is also used as various combustion apparatuses, for example, a metal cutting apparatus, a welding apparatus, or a heating apparatus such as a building or a greenhouse.

  However, in such a hydrogen-oxygen mixed gas combustion apparatus, a so-called flashback phenomenon in which the flame of a combustor such as a burner propagates to the gas source side is likely to occur, and such flashback is generated in the combustion gas flow path or the gas source. There was a risk of causing an unexpected explosion.

  Such a flashback phenomenon is likely to occur particularly when the combustion apparatus is extinguished. If the supply of combustion gas is simply cut off, combustion of the burner can easily reverse the combustion gas flow path and often cause a flashback phenomenon. It was.

  The present invention relates to an improved fire extinguishing apparatus and method for preventing the occurrence of flashback during such fire extinguishing.

The means according to the present invention is a fire extinguishing apparatus for a combustion apparatus for supplying a hydrogen-oxygen mixed gas from a gas source to a burner to combust the mixed gas, the main valve for opening and closing the mixed gas flow path, and the pressure of the mixed gas A non-combustible gas flow path that supplies a non-combustible gas from a non-combustible gas source to a mixed gas flow path upstream from the burner, a fire-extinguishing valve that opens and closes the non-combustible gas flow path, and opening and closing the main valve and fire-extinguishing valve. anda valve control device for controlling the valve control device is replaced at extinguishing, while maintaining the open state of the main valve, it opens the extinguishing valve, a mixed gas of the mixed gas passage near the burner with combustible gas After that, the fire valve is closed, the incombustible gas in the mixed gas flow path near the burner is replaced with the mixed gas, and then the main valve is closed .

Further, the method according to the present invention includes a mixed gas flow path for supplying a hydrogen-oxygen mixed gas of a gas source to a burner, a main valve that opens and closes the mixed gas flow path, and a non-combustible gas of an incombustible gas source mixed upstream of the burner. A non-combustible gas flow path that supplies the gas flow path, and a fire extinguishing valve that opens and closes the non-flammable gas flow path . The main valve is opened to supply a hydrogen-oxygen mixed gas from a gas source to the burner to burn the mixed gas. A fire extinguishing method for a combustion apparatus that performs a step of supplying a non-combustible gas having a pressure higher than that of the mixed gas to the burner by opening the fire valve during a fire extinguishing, and continuing the supply of the non-combustible gas for a certain period of time to mix in the vicinity of the burner The step of replacing the mixed gas in the gas flow path with a non-combustible gas, the step of stopping the supply of the non-combustible gas by closing the fire valve , the step of supplying the mixed gas to the burner, and the continuous supply of the mixed gas for a certain period of time , Mixed gas flow near the burner And replacing the non-combustible gas in the mixed gas, stop the supply of the mixed gas by closing the main valve, characterized in that it and a step of returning to the state of the ignition operation.

  As described above, according to the present invention, when the nonflammable gas is sent to the vicinity of the burner at the time of extinguishing fire that tends to cause backfire, and the combustion gas in the vicinity of the burner is replaced with the nonflammable gas, the flame of the burner causes the combustion gas flow path to flow. Propagation through is reliably prevented, thereby making it possible to reliably prevent backfire.

  FIG. 1 shows a preferred embodiment of a fire extinguishing apparatus according to the present invention.

  The hydrogen-oxygen mixed gas is stored in the gas source 10 and supplied to the burner 14 through the mixed gas flow path 12. The gas source 10 may be a combustion gas generator itself utilizing electrolysis as shown in the above-mentioned Japanese Patent Application No. 2006-187245 of the present inventor, and a hydrogen-oxygen mixed gas obtained from such a generator is used. It may be a gas source that accumulates. The burner 14 is a combustion burner suitable for various combustion apparatuses, and for example, a burner for feeding warmed air into a greenhouse is suitable.

  A main valve 16 is provided in the mixed gas passage 12 to control the opening and closing of the supply of the hydrogen-oxygen mixed gas from the gas source 10 to the burner 14.

  What is characteristic in the present invention is that non-combustible gas from the non-combustible gas source 18 such as air or inert gas is interrupted and supplied to the mixed gas flow path 12. For this purpose, the incombustible gas passage 20 is joined to the mixed gas passage 12 at the mixer 22 portion.

  The incombustible gas passage 20 is provided with a fire extinguishing valve 24, and the incombustible gas passage 20 is opened and closed by the fire extinguishing valve 24 to control the supply of the incombustible gas to the mixer 22.

  Both the main valve 16 and the fire-extinguishing valve 24 are controlled by a control signal from a valve control device 26, and the supply of mixed gas or incombustible gas to the burner 14 is optimally controlled by the valve control device 26.

  The fire extinguishing apparatus according to the present invention has the above configuration, and its operation will be described below.

  In FIG. 2, the supply amount of the mixed gas to the burner 14 is indicated by A, and similarly, the supply amount of the non-combustible gas to the burner 14 through the mixer 22 is indicated by B.

  A normal combustion state is shown from time t0 to t1, and a hydrogen-oxygen mixed gas is sent from the gas source 10 to the burner 14 to perform desired combustion. Of course, at this time, the main valve 16 is opened and the fire valve 24 is closed.

  When an instruction to extinguish combustion is given at time t1, the valve control device 26 opens the fire extinguishing valve 24 as shown in FIG. 2B. As a result, the incombustible gas is supplied from the incombustible gas source 18 to the mixer 22 through the incombustible gas passage 20, and the pressure of the incombustible gas at this time is set to 2 to 5 times the pressure of the hydrogen-oxygen mixed gas. Therefore, in a short time from time t1 to time t2, incombustible gas is substituted for the mixed gas in the mixed gas flow path from the burner 14 to the mixer 22, and the combustion of the burner 14 is quickly extinguished. At this time, there is no longer any mixed gas in the mixed gas flow path 12 from the burner 14 to the mixer 22, so that the flame does not propagate toward the gas source 10 when the burner 14 is extinguished. The fire extinguishes quickly.

  In the present embodiment, the valve control device 26 closes the fire valve 24 for a short time from time t2 to t3. In this embodiment, since the valve control device 26 keeps the main valve 16 open from time t0 to time t2, the mixed gas is sent from the gas source 10 to the burner 14 through the main valve 16 at this time. Incombustible gas existing from the burner 14 to the mixer 22 can be discharged.

  At time t3, the valve control device 26 also closes the main valve 16 and completes the fire extinguishing process of the combustion device.

  The non-combustible gas discharge from the time t2 to the time t3 described above can quickly bring the mixed gas close to the ignition flame when the burner 14 is ignited next time, and is useful for quickly performing the ignition work. However, the discharge of non-combustible gas from time t2 to time t3 is not essential in the present invention, and the fire-extinguishing process is completed simply by filling the mixed gas flow path 12 from the burner 14 to the mixer 22 with the non-combustible gas by the fire-extinguishing process. It is also possible.

  FIG. 3 shows another embodiment in the vicinity of the combined flow path of the mixed gas and the incombustible gas of the fire extinguisher according to the present invention.

  In this embodiment, the mixer 22 of FIG. 1 does not exist, and a three-way 30 is provided instead at the junction. A mixed gas flow path 12 that communicates with the hydrogen-oxygen mixed gas source 10 is connected to the first incoming connector 30a of the three-way path 30, while an incombustible gas flow path that communicates with the incombustible gas source 18 is connected to the second incoming connector 30b. 20 is connected.

  A short burner flow path 32 communicating with the burner 14 is connected to the output connector 30c of the three-way path 30.

  The mixed gas flow path 12 is provided with the check valve 34 and the main valve 16 described above in the vicinity of the three-way path 30, and the non-combustible gas flow path 22 is similarly provided with the check valve 36 and the digestion valve 24. ing.

  As apparent from FIG. 3, the three-way path 30 has a structure in which the mixed gas and the incombustible gas collide from opposite directions and then flow in the orthogonal direction to the outlet connector 30 c side.

  As a result, according to the embodiment of FIG. 3, when digestion is required, when the digestion valve 24 is opened and incombustible gas is fed into the three-way 30, the incombustible gas pressure at this time is slightly lower than the mixed gas pressure. Only by setting it high, the incombustible gas pushes out the mixed gas at the junction, interrupts and enters the outlet connector 30c, that is, the burner flow path 32, and easily prevents the mixed gas from flowing into the burner flow path 32 thereafter. it can. Thus, by providing a slight pressure difference, the incombustible gas can suppress the mixed gas and perform a reliable digestive action.

  Of course, the incombustible gas is prevented from flowing into the gas source 10 by the check valve 34 provided in the mixed gas flow path 12 during the digestion. Similarly, during normal combustion, the check valve 36 provided in the incombustible gas flow path 22 reliably prevents the mixed gas from flowing into the incombustible gas source 18. In the three-way path 30 in FIG. 3, the mixed gas side and the incombustible gas side are opposed to each other on a straight line, but of course, they can be opposed at the same angle with an appropriate angle.

  As described above, according to the present invention, it is possible to easily extinguish a combustion apparatus without causing backfire, and to provide a fire extinguishing apparatus and method extremely useful for combustion of a hydrogen-oxygen mixed gas. it can.

It is a schematic structure figure showing a suitable embodiment of a fire extinguishing device concerning the present invention. It is a chart figure showing an embodiment of a fire extinguishing method concerning the present invention. It is a schematic block diagram which shows other embodiment in the mixing part of the mixed gas and nonflammable gas of the fire extinguisher concerning this invention.

Explanation of symbols

  10 gas source, 12 mixed gas flow path, 14 burner, 16 main valve, 18 incombustible gas source, 20 incombustible gas flow path, 22 mixer, 24 fire extinguishing valve, 26 valve control device.

Claims (2)

A fire extinguishing device for a combustion device for supplying a hydrogen-oxygen mixed gas from a gas source to a burner to burn the mixed gas,
A main valve that opens and closes the mixed gas flow path;
A non-combustible gas passage configured to supply a non-combustible gas from a non-combustible gas source to a mixed gas passage upstream of the burner, which is set to a pressure higher than that of the mixed gas;
A fire-extinguishing valve that opens and closes the incombustible gas flow path
A valve control device for controlling opening and closing of the main valve and the fire-extinguishing valve;
Including
Valve controls, during fire extinguishing, while maintaining the open state of the main valve, opens the extinguishing valve, replacing the mixed gas of the mixed gas passage near the burner in non-combustible gas, and thereafter, closing the fire extinguishing valve, Replace the incombustible gas in the mixed gas flow path near the burner with mixed gas, and then close the main valve.
A fire extinguishing apparatus for a hydrogen-oxygen mixed gas combustion apparatus characterized by the above. A mixed gas flow path for supplying a hydrogen-oxygen mixed gas of a gas source to the burner;
A main valve that opens and closes the mixed gas flow path;
A non-combustible gas flow path for supplying a non-combustible gas from a non-combustible gas source to a mixed gas flow path upstream of the burner;
A fire-extinguishing valve that opens and closes the incombustible gas flow path
A combustion apparatus that extinguishes a main valve and supplies a hydrogen-oxygen mixed gas from a gas source to a burner to burn the mixed gas,
Supplying a non-combustible gas having a pressure higher than that of the mixed gas to the burner by opening the fire-extinguishing valve during extinguishing ,
Continuing the supply of incombustible gas for a certain period of time, replacing the mixed gas in the mixed gas flow path near the burner with incombustible gas; and
Stopping the supply of incombustible gas by closing the fire valve and supplying the mixed gas to the burner;
Continuing the supply of the mixed gas for a certain period of time, replacing the incombustible gas in the mixed gas flow path near the burner with the mixed gas; and
Stopping the supply of the mixed gas by the closing operation of the main valve, and returning to the ignition work state;
A fire extinguishing method for a hydrogen-oxygen mixed gas combustion apparatus characterized by comprising:

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