JP6891740B2 - Hydrogen gas burner device - Google Patents

Description

The present invention relates to a hydrogen gas burner device.

Conventionally, Japanese Patent Application Laid-Open No. 2000-249307 is available as a technique in such a field. In the burner device described in this publication, efficient combustion can be promoted by generating an air swirling flow to promote a mixed state of air and fuel.

Japanese Patent Application Laid-Open No. 2000-249307

However, when hydrogen gas is used as fuel in the combustion burner and the supplied air and hydrogen gas are mixed to form a mixed gas and used, the mixture of hydrogen gas and air is too intense. Therefore, the reactivity of hydrogen gas may become too high. In this case, a spot that becomes locally hot due to the combustion flame is likely to be formed, and a large amount of nitrogen oxides (hereinafter, NOx) is likely to be generated by combustion. When a large amount of NOx is generated, a removal device for removing NOx is required, which leads to an increase in cost.
The present invention provides a hydrogen gas burner device that suppresses the generation of NOx.

The hydrogen gas burner device according to the present invention has a cylindrical hydrogen gas pipe having an opening through which hydrogen gas flows in the pipe and ejects the hydrogen gas at one end, and a concentric circle so as to surround the hydrogen gas pipe. A cylindrical oxygen-containing gas pipe through which oxygen-containing gas flows, a hydrogen gas supply pipe that supplies hydrogen gas into the hydrogen gas pipe, and an oxygen-containing gas that supplies oxygen-containing gas into the oxygen-containing gas pipe. The hydrogen gas pipe is provided with a supply pipe, and the pipe shafts intersect so that the hydrogen gas flowing in the hydrogen gas pipe becomes a swirling flow on the other end side different from the end where the hydrogen gas is ejected. The hydrogen gas supply pipe is connected in this state, and the oxygen-containing gas is connected to the oxygen-containing gas pipe with the pipe axes crossed so that the oxygen-containing gas flowing in the oxygen-containing gas pipe becomes a swirling flow. The supply pipe is connected, and the flow velocity of the hydrogen gas ejected while swirling from the hydrogen gas pipe and the flow velocity of the oxygen-containing gas swirling in the oxygen-containing gas pipe are substantially the same velocity.
As a result, the hydrogen gas can be burned while suppressing the mixing of the hydrogen gas and the oxygen-containing gas.

As a result, the generation of NOx due to combustion can be suppressed.

It is a figure of the hydrogen gas burner device. It is a figure which showed the state which A looked at the hydrogen gas burner apparatus. It is an enlarged view of the state which A viewed the hydrogen gas burner device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the hydrogen gas burner device 1 includes a hydrogen gas pipe 11, an oxygen-containing gas pipe 12, a hydrogen gas supply pipe 13 for supplying hydrogen gas to the hydrogen gas pipe 11, and an oxygen-containing gas pipe 12. An oxygen-containing gas supply pipe 14 for supplying the oxygen-containing gas is provided. As shown in FIG. 1, the hydrogen gas burner device has an opening on the right side of FIG. 1, and burns while ejecting hydrogen gas and oxygen-containing gas. For example, general air can be used as the oxygen-containing gas, but any gas that does not contain hydrogen gas but contains oxygen may be used.

The hydrogen gas pipe 11 has a cylindrical shape having an opening through which hydrogen gas flows and one end of which hydrogen gas is ejected. Specifically, an opening is provided at the first end 11a, and in the vicinity of the second end 11b, a hydrogen gas supply pipe 13 for supplying hydrogen gas from the outer peripheral side of the hydrogen gas pipe 11 is provided. It is connected. Here, as shown in FIGS. 1 and 2, the hydrogen gas pipe 11 and the hydrogen gas supply pipe 13 are intersected so that their respective pipe shafts are in a twisted position, that is, they are connected so as to be eccentric. There is. In other words, in the vicinity of the second end 11b of the hydrogen gas pipe 11, hydrogen gas flows in from the hydrogen gas supply pipe 13 at a position deviated from the pipe axis of the hydrogen gas pipe 11. The flow velocity of hydrogen gas is adjusted by increasing or decreasing the pressing force when supplying hydrogen gas from the hydrogen gas supply pipe 13 to the hydrogen gas pipe 11.

As a result, in the hydrogen gas pipe 11, hydrogen gas flows as a swirling flow from the second end portion 11b to the first end portion 11a side. For example, as shown in FIG. 2, from the viewpoint of viewing the second end 11b side from the first end 11a side (view A in FIG. 1), the hydrogen gas rotates counterclockwise to the first end. It flows in the direction of ejection from the portion 11a side, that is, it becomes a swirling flow.

Typically, as shown in FIG. 1, the second end portion 11b of the hydrogen gas pipe 11 is arranged outside the second end portion 12b of the oxygen-containing gas pipe 12, which will be described later. In other words, the hydrogen gas pipe 11 is arranged so as to penetrate the second end portion 12b of the oxygen-containing gas pipe 12.

The oxygen-containing gas pipe 12 has a cylindrical shape through which the oxygen-containing gas flows. The oxygen-containing gas pipe 12 is formed to have a larger diameter than the hydrogen gas pipe 11. Further, the oxygen-containing gas pipe 12 is arranged concentrically so as to surround the hydrogen gas pipe 11. The first end portion 12a of the oxygen-containing gas pipe 12 is provided with an opening, and in the vicinity of the second end portion 12b, oxygen-containing gas for supplying oxygen-containing gas from the outer peripheral side of the oxygen-containing gas pipe 12 is contained. The gas supply pipe 14 is connected. Here, as shown in FIGS. 1 and 2, the oxygen-containing gas pipe 12, the oxygen-containing gas supply pipe 14, and the respective pipe shafts are crossed and connected so as to be in a twisted position. In other words, in the vicinity of the second end 12b of the oxygen-containing gas pipe 12, the oxygen-containing gas flows from the oxygen-containing gas supply pipe 14 at a position deviated from the pipe axis of the oxygen-containing gas pipe 12.

As a result, in the oxygen-containing gas pipe 12, the oxygen-containing gas flows as a swirling flow from the second end portion 12b to the first end portion 12a side. For example, as shown in FIG. 2, in view A of FIG. 1, the oxygen-containing gas flows in the direction of being ejected from the first end portion 12a side while rotating counterclockwise, that is, a swirling flow. The direction in which the oxygen-containing gas swirls in the oxygen-containing gas pipe 12 and the direction in which the hydrogen gas swirls in the hydrogen gas pipe 11 are the same direction. The flow velocity at which the oxygen-containing gas swirls in the oxygen-containing gas pipe 12 is substantially the same as the flow velocity at which the hydrogen gas flowing in the hydrogen gas pipe 11 swirls when ejected from the first end portion 11a. The flow velocity of the oxygen-containing gas is adjusted by increasing or decreasing the pressing force when supplying the oxygen-containing gas from the oxygen-containing gas supply pipe 14 to the oxygen-containing gas pipe 12.

Here, as shown in FIG. 1, the first end portion 11a of the hydrogen gas pipe 11 is arranged in the oxygen-containing gas pipe 12. As a result, the hydrogen gas ejected from the first end portion 11a of the hydrogen gas pipe 11 is ejected into the oxygen-containing gas pipe 12 while maintaining a swirled state in the hydrogen gas pipe 11, and is injected into the oxygen-containing gas pipe 12. Is mixed with the oxygen-containing gas of the above, and is ejected from the first end portion 12a of the oxygen-containing gas pipe 12 and burned.

One end of the hydrogen gas supply pipe 13 is connected to a hydrogen gas supply source (not shown), and the other end is connected to the vicinity of the second end 11b of the hydrogen gas pipe 11. The hydrogen gas supply pipe 13 supplies the hydrogen gas by pumping it so as to swirl in the hydrogen gas pipe 11.

One end of the oxygen-containing gas supply pipe 14 is connected to an oxygen-containing gas supply source (not shown), and the other end is connected to the vicinity of the second end 12b of the oxygen-containing gas pipe 12. .. The oxygen-containing gas supply pipe 14 supplies the oxygen-containing gas by pumping it so as to swirl in the oxygen-containing gas pipe 12.

Next, in the hydrogen gas burner device 1, the operation when hydrogen gas is supplied into the hydrogen gas pipe 11 and the oxygen-containing gas is supplied to the oxygen-containing gas pipe 12 for combustion will be described in detail.

As shown in FIGS. 1 and 2, the hydrogen gas spirally moves toward the first end 11a side in the hydrogen gas pipe 11 and is ejected, and the oxygen-containing gas is the first in the oxygen-containing gas pipe 12. It spirally moves toward the end 12a.

At this time, since the hydrogen gas pipe 11 has a small diameter, the diameter of the swirl of the hydrogen gas when ejected from the first end portion 11a becomes small. Similarly, since the diameter of the oxygen-containing gas pipe 12 is large, the diameter of the swirl of the oxygen-containing gas is large. Therefore, in the oxygen-containing gas pipe 12, the hydrogen gas is arranged inside and the oxygen-containing gas is arranged outside, and the hydrogen gas flows spirally in the same direction.

によって定まる。したがって、仮に酸素含有ガスを酸素Ｏ_２と仮定した場合であっても、重量比の換算によれば、酸素含有ガスにかかる遠心力は水素ガスにかかる遠心力の１６倍となり、酸素含有ガスにかかる遠心力の方が大きくなる。 Here, the _{molecular weight of oxygen O 2} (molecular weight 32) is _{16 times that of hydrogen H 2} (molecular weight 2). The centrifugal force applied to each spirally flowing gas is m: mass, v: velocity, r: radius.

Determined by. Therefore, even if the oxygen-containing gas _{is assumed to be oxygen O 2} , the centrifugal force applied to the oxygen-containing gas is 16 times the centrifugal force applied to the hydrogen gas according to the weight ratio conversion, and the oxygen-containing gas becomes the oxygen-containing gas. The centrifugal force becomes larger.

Therefore, as shown in FIG. 3, the oxygen-containing gas exerts a large force toward the wall portion 12c side of the oxygen-containing gas pipe 12 due to the centrifugal force. On the other hand, since the centrifugal force acting on the hydrogen gas is small, the force of the hydrogen gas toward the wall portion 12c is relatively small. Therefore, the oxygen-containing gas and the hydrogen gas are separated by the mass difference, so that the mixing of the gases is suppressed.

When hydrogen gas and oxygen-containing gas are used without swirling, the structure of the burner itself is often complicated and asymmetrical, and the gas flow depends on the shape of the burner. Therefore, the gases are likely to be mixed irregularly, and hot spots are likely to occur. However, in the present embodiment, by using each gas as a swirling flow, the gas flow can be easily controlled and the generation of hot spots can be suppressed.

Therefore, the flow velocity of the hydrogen gas when the hydrogen gas flowing through the hydrogen gas pipe 11 and the oxygen-containing gas flowing through the oxygen-containing gas pipe 12 are swirled in the same direction and ejected from the first end portion 11a of the hydrogen gas pipe 11 By setting the flow velocity of the oxygen-containing gas in the oxygen-containing gas pipe 12 to be substantially the same, it is possible to suppress unnecessary mixing of the gases by centrifugal force. As a result, the combustion rate becomes slower, and hot spots due to the combustion flame are less likely to occur, so that the generation of NOx can be suppressed.

1 Hydrogen gas burner device 11 Hydrogen gas pipe 12 Oxygen-containing gas pipe 13 Hydrogen gas supply pipe 14 Oxygen-containing gas supply pipe

Claims (1)

A cylindrical hydrogen gas pipe having an opening at which hydrogen gas flows through the pipe and ejects the hydrogen gas at one end.
A cylindrical oxygen-containing gas pipe arranged concentrically so as to surround the hydrogen gas pipe and through which oxygen-containing gas flows,
A hydrogen gas supply pipe that supplies hydrogen gas into the hydrogen gas pipe,
An oxygen-containing gas supply pipe for supplying oxygen-containing gas into the oxygen-containing gas pipe is provided.
The hydrogen gas pipe supplies the hydrogen gas in a state where the pipe axes intersect so that the hydrogen gas flowing in the hydrogen gas pipe becomes a swirling flow on the other end side different from the end where the hydrogen gas is ejected. The pipes are connected and
The oxygen-containing gas supply pipe is connected to the oxygen-containing gas pipe with the pipe axes crossed so that the oxygen-containing gas flowing in the oxygen-containing gas pipe becomes a swirling flow.
A hydrogen gas burner device in which the flow velocity of the hydrogen gas ejected while swirling from the hydrogen gas pipe and the flow velocity of the oxygen-containing gas swirling in the oxygen-containing gas pipe are substantially the same.

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