JP2019039607A - Hydrogen gas burner device - Google Patents

Abstract

To provide a hydrogen gas burner device which can suppress the generation of a backfire phenomenon in a hydrogen gas supply pipe.SOLUTION: A hydrogen gas burner device (100, 200) comprises; an ignitor (50) for igniting a hydrogen gas and an oxygen-containing gas; a hydrogen gas valve (23) arranged in the hydrogen gas supply pipe (20), and switching the supply and stop of the hydrogen gas; an oxygen-containing gas valve (13) arranged in the oxygen-containing gas supply pipe (10), and switching the supply and stop of the oxygen-containing gas; and a controller (61) for controlling the hydrogen gas valve (23), the oxygen-containing gas valve (13) and the ignitor (50). The controller (61) controls the ignitor (50) while controlling the hydrogen gas valve (23) and the oxygen-containing gas valve (13) so as to continue the supply of the oxygen-containing gas for a regulated time after stopping the supply of the hydrogen gas.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hydrogen gas burner apparatus.

  There is a burner in which hydrocarbon gas as fuel gas is supplied to a nozzle through a fuel supply pipe and the hydrocarbon gas is burned. An example of such a burner is disclosed in Patent Document 1. The fuel supply pipe is provided with a fuel gas valve for switching between supply and stop of the fuel gas.

JP 09-096402 A

  By the way, hydrogen gas may be used as fuel gas. In such a case, after the supply of the hydrogen gas is stopped, the hydrogen gas may burn on the downstream side of the fuel gas valve in the fuel supply pipe, and a backfire phenomenon may occur. One reason for this is that hydrogen gas is more easily combusted than hydrocarbon gas, and the remaining hydrogen gas is combusted.

  The present invention suppresses the occurrence of a flashback phenomenon in the hydrogen gas supply pipe.

The hydrogen gas burner device according to the present invention is
A hydrogen gas burner device comprising an ignition device for igniting a hydrogen gas supplied from a hydrogen gas supply pipe and an oxygen-containing gas supplied from an oxygen-containing gas supply pipe at a nozzle tip,
A hydrogen gas valve provided in the hydrogen gas supply pipe, for switching between supply and stop of the hydrogen gas;
An oxygen-containing gas valve provided in the oxygen-containing gas supply pipe, for switching between supply and stop of the oxygen-containing gas;
A controller for controlling the hydrogen gas valve, the oxygen-containing gas valve, and the ignition device,
The controller controls the ignition device to continue ignition while controlling the hydrogen gas valve and the oxygen-containing gas valve so as to continue supplying the oxygen-containing gas for a specified time after the supply of the hydrogen gas is stopped. Control.
According to such a configuration, after the supply of the hydrogen gas is stopped, the supply of the oxygen-containing gas and the ignition operation are continued. As a result, the hydrogen gas remaining on the downstream side of the hydrogen gas valve in the hydrogen gas supply pipe can be burned at the nozzle tip. Therefore, the occurrence of a flashback phenomenon in the hydrogen gas supply pipe is suppressed.

  The present invention can suppress the occurrence of a flashback phenomenon in a hydrogen gas supply pipe.

1 is a schematic diagram of a hydrogen gas burner device according to Embodiment 1. FIG. It is the schematic of the principal part of the hydrogen gas burner apparatus which concerns on Embodiment 1. FIG. 1 is a block diagram showing a system configuration of a hydrogen gas burner device according to Embodiment 1. FIG. 3 is a flowchart showing the operation of the hydrogen gas burner device according to Embodiment 1. 3 is an operation time chart of each configuration of the hydrogen gas burner device according to the first embodiment. 5 is a schematic diagram of a hydrogen gas burner device according to Embodiment 2. FIG. It is a block diagram which shows the system configuration | structure of the hydrogen gas burner apparatus which concerns on Embodiment 2. FIG. 6 is an operation time chart of each component of the hydrogen gas burner device according to the second embodiment.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. In addition, for clarity of explanation, the following description and drawings are simplified as appropriate.

(Embodiment 1)
A hydrogen gas burner apparatus according to Embodiment 1 will be described with reference to FIGS. 1 and 2.

  As shown in FIG. 1, the hydrogen gas burner apparatus 100 includes an oxygen-containing gas supply pipe 10, a hydrogen gas supply pipe 20, a nozzle 30, a furnace 40, and an ignition spark plug 50.

  The oxygen-containing gas supply pipe 10 is connected to the nozzle 30 and supplies the oxygen-containing gas to the nozzle 30. The oxygen-containing gas supply pipe 10 is provided with a blower 11, an oxygen-containing gas flow meter 12, and an oxygen-containing gas valve 13. The blower 11, the oxygen-containing gas flow meter 12, and the oxygen-containing gas valve 13 are provided in this order from upstream to downstream of the oxygen-containing gas supply pipe 10. The blower 11 sends the oxygen-containing gas into the oxygen-containing gas supply pipe 10. In the example shown in FIG. 1, air is used as the oxygen-containing gas. Note that the oxygen-containing gas is not limited to air and may be any gas containing oxygen. Moreover, it is preferable that oxygen-containing gas does not contain hydrogen substantially. The oxygen-containing gas may be generated using a manufacturing method including a step of removing hydrogen using a known method. The oxygen-containing gas flow meter 12 measures the flow rate of the oxygen-containing gas in the oxygen-containing gas supply pipe 10. The oxygen-containing gas valve 13 switches supply or stop of the oxygen-containing gas. The oxygen-containing gas flow meter 12 and the oxygen-containing gas valve 13 may use various valves depending on the type of oxygen-containing gas used.

  The hydrogen gas supply pipe 20 is connected to the nozzle 30 and supplies hydrogen gas to the nozzle 30. The hydrogen gas supply pipe 20 includes a hydrogen gas tank 21, a hydrogen flow meter 22, and a hydrogen gas valve 23. The hydrogen gas tank 21, the hydrogen flow meter 22, and the hydrogen gas valve 23 are provided in this order from the upstream side to the downstream side of the hydrogen gas supply pipe 20. The hydrogen gas tank 21 stores a predetermined amount of hydrogen gas. The hydrogen flow meter 22 measures the flow rate of hydrogen in the hydrogen gas supply pipe 20. The hydrogen gas valve 23 switches supply or stop of hydrogen gas.

  The nozzle 30 is provided in the furnace 40. In the example shown in FIG. 1, the nozzle 30 is provided on the side wall 41 b of the furnace body 41 of the furnace 40. As shown in FIG. 2, the nozzle 30 includes a nozzle body 31, a hydrogen gas supply nozzle 32, and an in-nozzle spark plug 33.

  The nozzle body 31 includes a cylindrical wall 31a, a closed end 31b that closes one end of the cylindrical wall 31a, and an open end 31c that opens the other end of the cylindrical wall 31a. The open end 31 c corresponds to the tip of the nozzle 30. The cylindrical wall 31a includes an outer cylindrical portion 31aa and an inner cylindrical portion 31ab disposed inside the outer cylindrical portion 31aa. The oxygen-containing gas supply pipe 10 is connected to the outer cylindrical portion 31aa. The oxygen-containing gas supply pipe 10 supplies an oxygen-containing gas to the inside of the outer cylindrical portion 31aa. The supplied oxygen-containing gas flows toward the closed end 31b and reaches the closed end 31b or the vicinity thereof. Thereafter, the supplied oxygen-containing gas passes through the inner cylindrical portion 31ab, flows toward the opening end portion 31c, and reaches the opening end portion 31c.

  The hydrogen gas supply nozzle 32 is a cylindrical body 32a whose both ends are closed. A hydrogen gas supply pipe 20 is connected to one end 32b of the cylindrical body 32a, and hydrogen gas is supplied from the hydrogen gas supply pipe 20. The other end 32c of the cylindrical body 32a includes a main outflow hole 32d through which hydrogen gas flows out and a sub outflow hole 32e. Since the main outflow hole 32d is larger than the sub outflow hole 32e, a large amount of hydrogen gas flows out.

  The hydrogen gas supply nozzle 32 is disposed inside the nozzle body 31. Specifically, the nozzle body 31 and the hydrogen gas supply nozzle 32 are arranged such that their axes extend along the same virtual axis. One end portion 32b of the hydrogen gas supply nozzle 32 is supported by the closed end portion 31b, and the other end portion 32c is supported through the frame 31d. A part of the other end 32 c protrudes from the nozzle body 31, and the main outflow hole 32 d and the sub outflow hole 32 e are located outside the nozzle body 31. The hydrogen gas flowing out from the main outflow hole 32d and the sub outflow hole 32e reaches the open end 31c or the vicinity thereof, and merges with the oxygen-containing gas.

  The in-nozzle spark plug 33 is provided between the inner cylindrical portion 31 ab of the cylindrical wall 31 a of the nozzle body 31 and the outer peripheral surface of the hydrogen gas supply nozzle 32. The tip 33 a of the in-nozzle spark plug 33 is located between the cylindrical wall 31 a of the nozzle body 31 and the outer peripheral surface of the hydrogen gas supply nozzle 32. The spark plug 33 in the nozzle can generate a spark-like electric flow from its tip 33a by sparking. When a spark-like electric flow is generated, the hydrogen gas remaining inside the cylindrical wall 31a of the nozzle body 31 can be burned.

  The furnace 40 includes a furnace body 41 and an exhaust tube 42 provided on the upper portion of the furnace body 41. The furnace body 41 includes a bottom 41a, a side wall 41b extending upward from the bottom 41a, and a ceiling 41c provided at an upper end portion of the side wall 41b. A space 41d surrounded by the bottom 41a, the side wall 41b, and the ceiling 41c may have a size capable of accommodating a predetermined workpiece. Specifically, the exhaust cylinder 42 is provided on the ceiling 41c. The exhaust cylinder 42 discharges the exhaust gas located inside the furnace body 41 to the outside of the furnace body 41.

  The ignition spark plug 50 is disposed inside the furnace body 41 of the furnace 40, and the tip 50 a of the ignition spark plug 50 is located in the vicinity of the other end portion 32 c of the hydrogen gas supply nozzle 32. The ignition spark plug 50 performs an ignition operation for igniting hydrogen gas and oxygen-containing gas. Specifically, the spark plug 50 for ignition generates a spark-like flow of electricity from its tip 50a by sparking. Due to the flow of electricity, the hydrogen gas and the oxygen-containing gas that have reached the opening end 31c of the nozzle body 31 are ignited. When ignited, the combustion flame F1 is generated at or near the main outflow hole 32d, and the combustion flame F2 is generated at or near the sub outflow hole 32e. Since the open end 31 c of the nozzle body 31 corresponds to the tip of the nozzle 30, the combustion flames F <b> 1 and F <b> 2 are generated at the tip of the nozzle 30.

  Next, the system configuration of the hydrogen gas burner apparatus 100 will be described with reference to FIG.

  As shown in FIG. 3, the hydrogen gas burner apparatus 100 includes a controller 61, a hydrogen flow meter 22, an oxygen-containing gas flow meter 12, a power switch 60, a hydrogen gas valve 23, an oxygen-containing gas valve 13, and a nozzle interior. A spark plug 33 and an ignition spark plug 50 are provided.

  The power switch 60 receives a user (not shown) operation and sends a command signal to the controller 61 for switching the hydrogen gas burner device 100 on and off. The hydrogen flow meter 22 measures the hydrogen gas flow rate in the hydrogen gas supply pipe 20 and sends a signal indicating the measured hydrogen gas flow rate to the controller 61. The oxygen-containing gas flow meter 12 measures the air flow rate in the oxygen-containing gas supply pipe 10 and sends a signal indicating the measured air flow rate to the controller 61.

  The controller 61 appropriately sends a command signal indicating supply or stop of hydrogen gas to the hydrogen gas valve 23 according to ON / OFF of the power switch, hydrogen gas flow rate, air flow rate, etc., and command signal indicating supply or stop of air. To the oxygen-containing gas valve 13. The controller 61 includes, for example, a sequence controller, a programmable logic controller (PLC), an arithmetic circuit having a CPU (Central Processing Unit), a program memory, a data memory, and other RAM (Random Access Memory) and ROM (Hardware). A storage device having a read only memory).

  The controller 61 appropriately sends a command signal indicating the start and stop of the spark generation operation to the in-nozzle spark plug 33 according to the power switch ON / OFF, the hydrogen gas flow rate, the air flow rate, and the like. Similarly, the controller 61 appropriately sends a command signal indicating the start and stop of the ignition operation to the ignition spark plug 50 according to the power switch ON / OFF, the hydrogen gas flow rate, the air flow rate, and the like.

  Next, an example of the operation of the hydrogen gas burner apparatus 100 will be described with reference to FIGS. 4 and 5.

  The power switch 60 is turned on (ON), and the operation of the hydrogen gas burner apparatus 100 is started (preliminary combustion step ST1). Furthermore, at the time t1 when the power switch is turned on, the ignition operation of the ignition spark plug 50 and the spark generation operation of the spark plug 33 in the nozzle are started. Thereafter, the ignition operation of the ignition spark plug 50 is continued. On the other hand, the spark plug 33 in the nozzle generates a spark to ignite the hydrogen gas remaining in the nozzle 30 and on the downstream side of the hydrogen gas valve 23 in the hydrogen gas supply pipe 20. After the predetermined period has elapsed, the spark generation operation of the in-nozzle spark plug 33 is stopped. The spark generation operation of the intra-nozzle spark plug 33 may be performed until the hydrogen gas remaining on the downstream side of the hydrogen gas valve 23 in the nozzle 30 and the hydrogen gas supply pipe 20 is sufficiently combusted.

  Subsequently, supply of hydrogen and air is started, and combustion of hydrogen and air is started (hydrogen combustion start step ST2). Specifically, the ignition operation of the ignition spark plug 50 is continued at the time t2 when the supply of hydrogen and air is started, and the ignition operation is performed after the lapse of the predetermined period and before the time t3. To stop. Therefore, hydrogen and air start to burn by the ignition operation of the ignition spark plug 50. Since hydrogen and air are continuously supplied, combustion continues. In addition, at the time t2 when the supply of hydrogen and air is started, the spark generation operation of the spark plug 33 in the nozzle has already stopped. Further, the generation operation remains stopped at the time point after the elapse of the predetermined period and before the time point t3.

  Subsequently, the power switch 60 is turned off (OFF) to stop the supply of hydrogen gas (hydrogen supply stop step ST3). Here, a predetermined amount of hydrogen gas remains downstream of the hydrogen gas valve 23 in the hydrogen gas supply pipe 20. Meanwhile, air continues to be supplied to the furnace 40. Thereby, the temperature of the nozzle 30 and the furnace 40 is lowered. Further, the spark generation operation of the intra-nozzle spark plug 33 is performed again and again. In the hydrogen gas supply pipe 20, the gas remaining on the downstream side of the hydrogen gas valve 23 is ignited and burned.

  Subsequently, the supply of air is stopped (air supply stop step ST4). In other words, the air supply and the spark generation operation of the spark plug 33 in the nozzle are continuously performed for a specified time from the time t3 when the supply of hydrogen gas is stopped to the time t4 when a predetermined time has elapsed. Specifically, the supply of air may be stopped after the temperatures of the nozzle 30 and the furnace 40 are sufficiently lowered.

  Finally, the spark generation operation of the intra-nozzle spark plug 33 is stopped (in-nozzle spark operation stop step ST5). In other words, the spark generation operation of the spark plug 33 in the nozzle is continuously performed for a predetermined time from the time t3 when the supply of hydrogen gas is stopped to a time t5 when the predetermined time has elapsed. In the hydrogen gas supply pipe 20, the gas remaining further downstream from the hydrogen gas valve 23 is ignited and burned.

  As described above, according to the above operation example, after the supply of the hydrogen gas is stopped, the supply of the oxygen-containing gas and the ignition operation of the spark plug 33 in the nozzle are continued. Thereby, the hydrogen gas remaining in the hydrogen gas supply pipe 20 on the downstream side of the hydrogen gas valve 23 can be burned in the nozzle 30. Therefore, the occurrence of a flashback phenomenon in the hydrogen gas supply pipe 20 can be suppressed.

(Embodiment 2)
Next, the hydrogen gas burner apparatus according to Embodiment 2 will be described with reference to FIGS.

  As shown in FIG. 6, the hydrogen gas burner apparatus 200 has the same configuration as the hydrogen gas burner apparatus 100 (see FIG. 1) except that an in-furnace spark plug 51 is included. The in-furnace spark plug 51 is provided on the ceiling 41 c of the furnace body 41 of the furnace 40. The in-furnace spark plug 51 is preferably closer to the exhaust tube 42 than the nozzle 30. The in-furnace spark plug 51 can generate a spark at its tip 51a.

  As shown in FIG. 7, the hydrogen gas burner apparatus 200 has the same configuration as the hydrogen gas burner apparatus 100 (see FIG. 3) except that the system includes a spark plug 51 in the furnace. The controller 61 appropriately sends a command signal indicating the start and stop of the spark generation operation to the in-furnace spark plug 51 according to the power switch ON / OFF, the hydrogen gas flow rate, the air flow rate, and the like.

  Next, an example of the operation of the hydrogen gas burner apparatus 200 will be described with reference to FIG. This example has the same configuration as an example of the operation of the hydrogen gas burner apparatus 100 described above (see FIGS. 4 and 5).

  The power switch 60 is turned on (ON), and the operation of the hydrogen gas burner device 200 is started (preliminary combustion step ST21). Furthermore, at the time t1 when the power switch is turned on, the ignition operation of the ignition spark plug 50, the spark generation operation of the in-nozzle spark plug 33, and the spark generation operation of the in-furnace spark plug 51 are started. Thereafter, the ignition operation of the ignition spark plug 50 is continued. On the other hand, the spark plug 33 in the nozzle generates a spark to ignite the hydrogen gas remaining in the nozzle 30 and on the downstream side of the hydrogen gas valve 23 in the hydrogen gas supply pipe 20. After the predetermined period has elapsed, the spark generation operation of the in-nozzle spark plug 33 is stopped. The spark generation operation of the intra-nozzle spark plug 33 may be performed until the hydrogen gas remaining on the downstream side of the hydrogen gas valve 23 in the nozzle 30 and the hydrogen gas supply pipe 20 is sufficiently combusted. Further, the ignition operation of the in-furnace spark plug 51 is continued, and the ignition operation is intermittently performed after time t2.

  Subsequently, supply of hydrogen and air is started, and combustion of hydrogen and air is started (hydrogen combustion start step ST22). Specifically, the ignition operation of the ignition spark plug 50 is continued at the time t2 when the supply of hydrogen and air is started, and the ignition operation is performed after the lapse of the predetermined period and before the time t3. To stop. Therefore, hydrogen and air start to burn by the ignition operation of the ignition spark plug 50. Since hydrogen and air are continuously supplied, combustion continues. In addition, at the time t2 when the supply of hydrogen and air is started, the spark generation operation of the spark plug 33 in the nozzle has already stopped. Further, the generation operation remains stopped at the time point after the elapse of the predetermined period and before the time point t3. Further, since the ignition operation of the in-furnace spark plug 51 is continued intermittently, hydrogen gas can be burned inside the furnace 40. Therefore, abnormal combustion of hydrogen gas due to generation of static electricity not intended by the user is suppressed.

  Subsequently, the power switch 60 is turned off (OFF), and the supply of hydrogen gas is stopped (hydrogen supply stop step ST23). Here, a predetermined amount of hydrogen gas remains downstream of the hydrogen gas valve 23 in the hydrogen gas supply pipe 20. Meanwhile, air continues to be supplied to the furnace 40. Thereby, the temperature of the nozzle 30 and the furnace 40 is lowered. Further, the spark generation operation of the in-nozzle spark plug 33 is performed again and intermittently. By causing the gas remaining on the downstream side of the hydrogen gas valve 23 in the hydrogen gas supply pipe 20 to ignite and burn, the occurrence of abnormal combustion of hydrogen gas can be suppressed. Further, the ignition operation of the in-furnace spark plug 51 is performed at a higher frequency than the ignition operation of the in-furnace spark plug 51 in the hydrogen combustion start step ST22. Therefore, hydrogen gas can be combusted inside the furnace 40.

  Subsequently, the supply of air is stopped (air supply stop step ST24). That is, the supply of air, the spark generation operation of the spark plug 33 in the nozzle, and the ignition operation of the in-furnace spark plug 51 from a time t3 when the supply of hydrogen gas is stopped to a time t4 when a predetermined time has elapsed. And continue. Specifically, the supply of air may be stopped after the temperatures of the nozzle 30 and the furnace 40 are sufficiently lowered.

  Finally, the spark generation operation of the in-nozzle spark plug 33 and the ignition operation of the in-furnace spark plug 51 are stopped (intra-nozzle spark operation stopping step ST25). That is, the spark generating operation of the spark plug 33 in the nozzle is continuously performed for a predetermined time from the time t3 when the supply of hydrogen gas is stopped to a time t5 when the predetermined time has elapsed. Generation of abnormal combustion of hydrogen gas can be suppressed by igniting and burning the gas that has remained further downstream from the hydrogen gas valve 23 in the hydrogen gas supply pipe 20. Further, the ignition operation of the in-furnace spark plug 51 is continued at the same frequency. Therefore, hydrogen gas can be combusted inside the furnace 40.

  As described above, according to the above-described operation example, as in the first embodiment, after the supply of hydrogen gas is stopped, the supply of the oxygen-containing gas and the ignition operation of the spark plug 33 in the nozzle are continued. To do. Thereby, the hydrogen gas remaining in the hydrogen gas supply pipe 20 on the downstream side of the hydrogen gas valve 23 can be burned in the nozzle 30. Therefore, the occurrence of a flashback phenomenon in the hydrogen gas supply pipe 20 can be suppressed.

  Further, according to the above-described operation example, the in-furnace spark plug 51 performs an ignition operation during all the steps. Therefore, hydrogen gas inside the furnace 40 can be burned, and occurrence of abnormal combustion of hydrogen gas due to static electricity unintended by the user can be suppressed.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention. For example, the hydrogen gas burner apparatuses 100 and 200 described above include the furnace 40, but may include a boiler. The hydrogen gas burner apparatuses 100 and 200 include the ignition spark plug 50, but may include other types of ignition apparatuses.

100, 200 Hydrogen gas burner device 10 Oxygen-containing gas supply pipe 13 Oxygen-containing gas valve 20 Hydrogen gas supply pipe 23 Hydrogen gas valve 30 Nozzle
32 Hydrogen gas supply nozzle 33 Spark plug in nozzle 40 Furnace 50 Spark plug for ignition 61 Controller

Claims (1)

A hydrogen gas burner device comprising an ignition device for igniting a hydrogen gas supplied from a hydrogen gas supply pipe and an oxygen-containing gas supplied from an oxygen-containing gas supply pipe at a nozzle tip,
A hydrogen gas valve provided in the hydrogen gas supply pipe, for switching between supply and stop of the hydrogen gas;
An oxygen-containing gas valve provided in the oxygen-containing gas supply pipe, for switching between supply and stop of the oxygen-containing gas;
A controller for controlling the hydrogen gas valve, the oxygen-containing gas valve, and the ignition device,
The controller controls the ignition device to continue ignition while controlling the hydrogen gas valve and the oxygen-containing gas valve so as to continue supplying the oxygen-containing gas for a specified time after the supply of the hydrogen gas is stopped. Control,
Hydrogen gas burner device.

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