JP2014044029A - Burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a burner capable of reducing probabilities of accidental fire and explosion while stably burning a fuel gas including hydrogen.SOLUTION: A burner 1 includes a first chamber 6 which is annularly formed around a shaft center X of a nozzle N, and to which a first gas including oxygen is supplied, and the heat generated in a combustion space S2 is transferred, and a second chamber 7 to which a second gas including hydrogen as a fuel gas is supplied, and the heat generated in the combustion space S2 is transferred. A cylindrical space S1 formed between a pillar body P and a cylindrical body 2 is connected with the first chamber 6 and the second chamber 7, a cross-sectional area of a flow channel of the second chamber 7 is reduced toward a joining portion 7a to the cylindrical space S1, the second gas is sucked from the second chamber 7 and mixed to the first gas flowing into the cylindrical space S1 from the first chamber 6, and the mixture gas is allowed to flow in the cylindrical space S1 toward the combustion space S2.

Description

  The present invention relates to a burner including a nozzle having a gas jet port for jetting at least fuel gas into a combustion space, and ignition means for igniting fuel gas jetted from the gas jet port.

  Patent Document 1 describes a burner including a nozzle having a gas ejection port for ejecting fuel gas into a combustion space, and ignition means for igniting the fuel gas ejected from the gas ejection port. The combustion space in which the fuel gas is burned by the burner is adjacent to a reforming processing unit for generating a hydrogen-containing gas supplied to the fuel cell by the reforming process of the raw fuel gas. And the combustion heat which generate | occur | produces in combustion space is utilized for the heating use of a reforming process part.

  Moreover, in the burner described in Patent Document 1, air containing oxygen and fuel containing hydrogen are injected into the combustion space separately into the combustion space, and the air and fuel are mixed in the combustion space. Specifically, by arranging the first jet port of air to the combustion space, the fuel jet port, and the second jet port of air in order from the inner side to the outer side in the radial direction of the combustion space, In other words, the fuel injected into the combustion space is surrounded by air from the inner diameter side and the outer diameter side so that air and fuel are mixed well. And it is going to produce | generate the flame or combustion gas with a non-uniform distribution.

JP 2004-182489 A

  In the burner described in Patent Document 1, hydrogen as a fuel is supplied to the combustion space at a high concentration with little mixing with the combustion air. For this reason, incomplete combustion is likely to occur, but flame holding reliability is low and misfire is likely to occur. May be caused).

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a burner that can reduce the possibility of misfire or deflagration while stably burning a fuel gas containing hydrogen.

The characteristic configuration of the burner according to the present invention for achieving the above object has a columnar body and a cylinder surrounding the outer peripheral surface of the columnar body, and is formed between the columnar body and the cylinder. A nozzle having a gas ejection port for ejecting at least fuel gas into the cylindrical combustion space through the cylindrical space;
A spark is generated between a high voltage electrode portion provided on the tip side of the nozzle exposed to the combustion space and applied with a high voltage, and a counter electrode portion provided in proximity to the high voltage electrode portion. An ignition means for igniting the fuel gas ejected from the gas ejection port,
A first chamber formed in an annular shape around an axis of the nozzle and supplied with a first gas containing oxygen;
A second chamber formed annularly around the axis of the nozzle and supplied with a second gas containing hydrogen as the fuel gas;
The cylindrical space formed between the columnar body and the cylindrical body is connected to the first chamber and the second chamber,
The second chamber is formed such that a cross-sectional area of the flow path becomes smaller toward a joining portion to the cylindrical space,
The second gas is mixed with the first gas flowing into the cylindrical space from the first chamber while being sucked from the second chamber, and the mixed gas of the first gas and the second gas is mixed with the cylinder. It is in the point which flows into the combustion space toward the combustion space.

According to the above characteristic configuration, the second chamber is formed so that the cross-sectional area of the flow path becomes smaller toward the joining portion to the cylindrical space, and in addition, the first gas flowing into the cylindrical space from the first chamber On the other hand, after the second gas is mixed while being sucked from the second chamber, the mixed gas of the first gas and the second gas flows toward the combustion space through the cylindrical space. That is, the premix volume of the first gas and the second gas is configured to be small. As a result, it is possible to reduce the possibility of backfire when burning hydrogen having a high combustion rate contained in the second gas. Even if deflagration occurs, since the premix volume is reduced, the scale of deflagration can be reduced, so that it is possible to avoid deformation or damage of the burner components due to deflagration. In addition, since the second gas is mixed with the first gas flowing into the cylindrical space from the first chamber while being sucked from the second chamber, the first gas is adjusted to some extent according to the flow rate fluctuation of the first gas flowing through the cylindrical space. Two gases are supplied to the cylindrical space. That is, the ratio between the fuel gas containing hydrogen and oxygen does not vary greatly. As a result, combustion can be stabilized and unburned combustible gas or carbon monoxide accompanying incomplete combustion can be prevented from being generated.
Furthermore, a cylindrical space in which the first gas and the second gas flow is provided between the first chamber and the combustion space and between the second chamber and the combustion space. That is, the static pressure of the first gas in the first chamber and the static pressure of the second gas in the second chamber are once converted into dynamic pressure in the cylindrical space. As a result, even if there is a pressure fluctuation in the combustion space, the influence of the pressure fluctuation can hardly be exerted on the pressure in the first chamber and the pressure in the second chamber.

  Further, the combustion heat generated in the combustion space is transmitted to the first chamber and the second chamber. That is, since the first gas is supplied to the combustion space after passing through the first chamber, heating to the first gas is performed while staying in the first chamber before being supplied to the combustion space. . Similarly, since the second gas passes through the second chamber and is supplied to the combustion space, the second gas stays in the second chamber before being supplied to the combustion space, that is, merges on the inner peripheral side. Heating to the second gas is performed while staying on the outer peripheral side having a larger channel cross-sectional area than the part. Therefore, even if water droplets are included in the first gas, the water droplets can be reduced or removed by evaporation while staying in the first chamber before being supplied to the combustion space. Similarly, even if moisture is contained in the second gas, the water droplets can be reduced or removed by evaporation while staying in the second chamber before being supplied to the combustion space. As described above, since the water droplets contained in the first gas or the second gas are removed in the previous stage before reaching the high-temperature combustion space, the flame is blown by the water droplets instantaneously evaporating and expanding in the combustion space. The occurrence of problems such as disappearance can be avoided, and the flame can be stably burned.

According to still another feature of the burner according to the present invention, the first gas is supplied to the first chamber so as to swivel around the axis of the nozzle in the first chamber,
The second gas is supplied to the second chamber so as to turn around the axis of the nozzle in the second chamber.

  According to the above characteristic configuration, by turning, the path length of the first gas in the first chamber can be substantially increased by suppressing the short path, and the path length of the second gas in the second chamber is also the same. Can be long. As a result, the time during which the first gas receives heat transfer within the first chamber can be substantially increased, and the time during which the second gas receives heat transfer within the second chamber is also substantially increased. can do. In particular, when the first gas is swirling in the first chamber and the second gas is swirling in the second chamber, when the first gas contacts the wall surfaces of the first chamber and the second chamber where the combustion heat of the combustion space is transmitted, By directly receiving heat from the wall surfaces of the first chamber and the second chamber, water droplets contained in the first gas and the second gas can be further effectively reduced or removed by evaporation.

  Still another characteristic configuration of the burner according to the present invention is that the swirling direction of the first gas in the first chamber is opposite to the swirling direction of the second gas in the second chamber.

  According to the above characteristic configuration, the swirling direction of the first gas flowing into the cylindrical space while swirling from the first chamber is opposite to the swirling direction of the second gas flowing into the cylindrical space while swirling from the second chamber. Become a direction. As a result, the first gas and the second gas collide with each other in the cylindrical space and the mixing of both is promoted, and the swirling direction around the axial direction of the gas is prevented from being biased in one direction. A good flame close to line symmetry in the axial direction can be formed.

  Still another characteristic configuration of the burner according to the present invention lies in that a spacer for maintaining a constant distance between the columnar body and the cylindrical body is provided.

  According to the above characteristic configuration, in the cylindrical space, the width of the cylindrical space can be favorably maintained by the spacer, and the flow of the first gas and the second gas can be controlled. In addition, there is an advantage that the first gas and the second gas flowing through the cylindrical space collide with the spacer to disturb the gas flow, and as a result, the mixing of the first gas and the second gas is further promoted.

  Yet another characteristic configuration of the burner according to the present invention is that the spacer is configured to swirl the gas flowing through the cylindrical space in one direction around the axis of the nozzle.

  According to the above characteristic configuration, the first gas and the second gas can be caused to flow into the cylindrical space while being swung by the spacer. That is, the mixing of the first gas and the second gas in the cylindrical space can be promoted as compared with the case where the first gas and the second gas pass through the cylindrical space without turning. .

Still another characteristic configuration of the burner according to the present invention includes a plurality of the spacers,
At least one of the spacers swirls the gas flowing through the cylindrical space in one direction around the axis of the nozzle,
Another at least one said spacer exists in the point which swirls the gas which flows through the said cylindrical space to the other direction around the axial center of the said nozzle.

  According to the above characteristic configuration, gas is forcibly swirled by the spacer provided in the cylindrical space, so that the gas swirling in one direction and the gas swirling in the other direction also in the cylindrical space. A collision occurs, which promotes mixing of the two. In addition, it is possible to prevent the swirling direction from being biased in one direction during swirling around the axial direction of the mixed gas, and to form a good flame close to line symmetry in the nozzle axial direction.

  Still another characteristic configuration of the burner according to the present invention is that a collision target in which at least a part of a mixed gas of the first gas and the second gas ejected from the gas ejection port of the nozzle to the combustion space collides. Is provided on the downstream side in the vicinity of the gas outlet, and the collision target is configured to have air permeability.

  According to the above characteristic configuration, when the mixed gas ejected from the gas outlet collides with the collision target and passes through the collision target, the flow rate of the mixed gas decreases. Therefore, in the region where the flow rate of the mixed gas decreases. Can improve the flame holding property. Furthermore, the flame holding property is enhanced by the red heat of the collision target due to the radiation of the flame, and misfire can be suppressed. Moreover, since this collision object has air permeability, the mixed gas that has passed through the collision object also contributes to the formation of flame, and flame holding performance is improved. Further, when the gas swirling in the cylindrical space collides with the collision target, at least the swirling is weakened. As a result, even if the swirl direction of the gas in the cylindrical space is biased in one direction, it can be corrected that the gas is jetted into the combustion space with the swirl direction being strongly biased. Therefore, for example, even if the spacer provided in the cylindrical space allows the gas to swirl only in one direction, the gas can be jetted into the combustion space after weakening the swirling of the gas by the collision target.

  Yet another characteristic configuration of the burner according to the present invention is that the collision object and the cylinder are made of a conductive material, and the collision object is electrically connected to the cylinder and the counter electrode. It is in the point used as a part.

  According to the above characteristic configuration, spark ignition between the high-voltage electrode unit and the counter electrode unit is performed in a region where the mixed gas ejected from the gas ejection port collides with the collision target and the flow velocity of the mixed gas decreases. It can be carried out.

  Yet another characteristic configuration of the burner according to the present invention is such that the pressure in the cylindrical space at the merging portion with the second chamber is lower than the pressure in the second chamber. The flow rate of the first gas flowing through the section is adjusted.

  According to the above characteristic configuration, the second gas can be effectively drawn into the cylindrical space by the venturi effect.

Still another characteristic configuration of the burner according to the present invention is that the combustion space is disposed adjacent to a reforming processing unit for generating a hydrogen-containing gas supplied to the fuel cell by reforming the raw fuel gas. ,
The combustion heat generated in the combustion space is used for heating the reforming unit.

  According to the above characteristic configuration, the combustion heat generated in the combustion space can be transmitted to the reforming processing unit adjacent to the combustion space so that the reforming processing unit is heated. As a result, the reforming reaction in the reforming processing section, which is an endothermic reaction, can be promoted using the combustion heat.

According to still another feature of the burner according to the present invention, the ignition means has a spark plug having a center electrode and a ground electrode,
The center electrode of the spark plug is electrically connected to a conductor rod functioning as the high voltage electrode portion exposed to the combustion space,
The ground electrode of the spark plug is electrically connected to the counter electrode portion.

  According to the above characteristic configuration, the center electrode of the spark plug is extended using the conductor rod functioning as the high voltage electrode portion. That is, even if the center electrode of the spark plug is not exposed to the tip end side of the nozzle, the center electrode can be extended using the conductor rod to expose the conductor rod to the tip end side of the nozzle.

  Still another characteristic configuration of the burner according to the present invention is that the center electrode of the spark plug and the conductor rod are electrically connected with a conductive elastic body interposed therebetween.

  According to the above characteristic configuration, the conductive elastic body is crimped to the center electrode and the conductor rod of the spark plug, so that the electrical connection between the center electrode of the spark plug and the conductor rod is ensured through the conductive elastic body. It can be carried out. In addition, since it is possible to freely remove only the spark plug while leaving the conductor rod and the conductive elastic body, for example, when the spark plug fails, it is possible to easily replace only the spark plug.

  Yet another characteristic configuration of the burner according to the present invention is that the center electrode of the spark plug and the conductor rod are electrically and structurally connected by welding.

  According to the above characteristic configuration, the electrical and structural connection between the center electrode of the spark plug and the conductor rod can be reliably performed by welding.

It is a figure which shows the cross-section of a burner. It is a perspective view of a burner. It is a figure explaining the structure of a spacer. It is a figure which shows the cross-section of the burner of another embodiment. It is a figure explaining the structure of the spacer of another embodiment.

Below, with reference to drawings, the structure of the burner 1 which concerns on this invention is demonstrated.
FIG. 1 is a view showing a cross-sectional structure of the burner 1. FIG. 2 is a perspective view of the burner 1. As shown in the drawing, in the combustion space S2 of the burner 1, a nozzle N for ejecting fuel gas toward the combustion space S2 and igniting the ejected fuel gas projects. In the present embodiment, the combustion space S2 of the burner 1 is disposed adjacent to the reforming processing unit 30 for generating a hydrogen-containing gas supplied to a fuel cell (not shown) by the reforming process of the raw fuel gas. The combustion heat generated in the combustion space S <b> 2 is used for heating the reforming processing unit 30. Then, the hydrogen-containing gas mainly containing hydrogen generated by the reforming processing unit 30 is supplied to the fuel electrode of the fuel cell.

  The combustion space S2 for burning the fuel gas is formed as a space inside the cylindrical side wall 16 having the axis X in the vertical direction. The upper side of the combustion space S2 is closed by a nozzle N, a first chamber 6 and a second chamber 7 which will be described later. And the burner 1 is comprised so that the front-end | tip of the nozzle N in which the gas jet nozzle 3 was formed may face downward. As a result, in the combustion space S2, the fuel gas is ejected downward from the gas ejection port 3 of the burner 1 provided above, and a downward flame is formed.

  A cylindrical outer wall 19 arranged concentrically with the side wall 16 is provided on the outer side of the cylindrical side wall 16 surrounding the combustion space S2 of the burner 1. A combustion exhaust gas passage 20 formed between the side wall 16 and the outer wall 19 is communicated with the combustion space S2 by a folded portion 21 provided at the lower end of the side wall 16. As a result, the combustion exhaust gas generated in the combustion space S2 flows downward in the combustion space S2, then flows into the combustion exhaust gas passage 20 through the turn-back portion 21, and flows upward through the combustion exhaust gas passage 20 and then externally. To be discharged. The reforming processing unit 30 is disposed adjacent to the combustion space S2 as a cylindrical portion surrounding the outer wall 19, and is heated by the heat of the combustion exhaust gas flowing through the combustion exhaust gas passage 20 being transmitted through the outer wall 19. It is comprised so that.

  The nozzle N includes a columnar body P and a cylindrical body 2 that surrounds the outer peripheral surface of the columnar body P. The tip of the nozzle N where the gas outlet 3 for ejecting at least fuel gas into the cylindrical combustion space S2 through the cylindrical space S1 formed between the columnar body P and the cylindrical body 2 is exposed to the combustion space S2. On the side. On the tip side of the nozzle N exposed to the combustion space S2, a high voltage electrode portion 4 to which a high voltage is applied and a counter electrode portion 5 provided in the vicinity of the high voltage electrode portion 4 are provided. The high voltage electrode unit 4 and the counter electrode unit 5 function as ignition means F that generates sparks and ignites the fuel gas ejected from the gas ejection port 3.

  The columnar body P has a spark plug 12 that constitutes the ignition means F inside a conductive inner cylinder 13 such as metal. The spark plug 12 has a center electrode 12a and a ground electrode 12b with an insulator 12c interposed therebetween. The center electrode 12a of the spark plug 12 is electrically connected to the conductor rod 22 functioning as the high voltage electrode portion 4 exposed to the combustion space S2. The conductor rod 22 is fixed to the inner cylinder 13 by filling the space between the conductor rod 22 and the inner cylinder 13 with an insulating refractory material 14 made of ceramic. In the present embodiment, the center electrode 12a of the spark plug 12 and the conductor rod 22 are electrically connected with the conductive elastic body 23 interposed therebetween. For example, a conductive spring or the like can be used as the conductive elastic body 23. Thus, since the conductive elastic body 23 is crimped to the center electrode 12a of the spark plug 12 and the conductor rod 22, the electrical connection between the center electrode 12a of the spark plug 12 and the conductor rod 22 is connected to the conductive elastic body. 23 can be performed reliably. In addition, since it is possible to freely remove only the spark plug 12 while leaving the conductor rod 22 and the conductive elastic body 23, for example, when the spark plug 12 fails, it is easy to replace only the spark plug 12. Yes.

  Furthermore, even if the combustion heat generated in the combustion space is transmitted to the constituent members of the burner 1 as in the present embodiment, the first gas and the first gas are disposed on the outer peripheral surface of the inner cylinder 13 provided with the spark plug 12 inside. 2 gas contacts and cooling of the inner cylinder 13 is performed. Therefore, the heat resistance performance required for the spark plug 12 can be lowered.

  In the present embodiment, the interior of the burner 1 is partitioned by a cylindrical body 2, an inner cylinder 13, a top plate 15, a side wall 16, a first partition wall 17, and a second partition wall 18. Moreover, these cylinder 2, the inner cylinder 13, the top plate 15, the side wall 16, and the 2nd partition 18 are comprised using electroconductive materials, such as a metal with high heat resistance.

  The ground electrodes 12b of the spark plug 12 are in electrical contact with each other in contact with the inner cylinder 13. The inner cylinder 13, the top plate 15, the side wall 16, the second partition 18, the cylinder 2, and the collision target 11 are all configured using a conductive material. As a result, the inner cylinder 13 in contact with the ground electrode 12 b of the spark plug 12 is electrically connected to the collision target 11 through the top plate 15, the side wall 16, and the cylinder 2 of the burner 1. The collision target 11 is used as the counter electrode portion 5 of the ignition means F. That is, the ground electrode 12 b of the spark plug 12 is electrically connected to the counter electrode portion 5 of the ignition means F.

  The burner 1 has a collision target 11 that collides with at least a part of a mixed gas of the first gas and the second gas ejected from the gas ejection port 3 of the nozzle N into the combustion space S2 on the downstream side in the vicinity of the gas ejection port 3. Prepare. The collision target 11 is configured to have air permeability. For example, the collision object 11 can be obtained by forming a sintered metal, a foam metal, a metal mesh or the like in an annular shape. Or the to-be-collised body 11 is obtained by forming a vent hole in a metal plate. By using such a collision object 11, at least a part of the mixed gas ejected from the gas ejection port 3 collides with the collision object 11 and passes through the collision object 11. That is, since the flow velocity of the mixed gas ejected from the gas ejection port 3 decreases while colliding with the collision target 11, the flame holding property in the region where the mixed gas flow velocity is reduced can be improved. Furthermore, the flame holding property is enhanced by the red heat of the collision target 11 due to the radiation of the flame, and misfire can be suppressed. Further, since the collision target 11 has air permeability, the mixed gas that has passed through the collision target 11 also contributes to the formation of flame, and flame holding performance is improved.

  In addition, the burner 1 is formed in an annular shape around the axis X of the nozzle N, and is configured to be supplied with a first gas containing oxygen and to transmit heat generated in the combustion space S2. The chamber 6 is formed in an annular shape around the axis X of the nozzle N, and is configured to be supplied with a second gas containing hydrogen as a fuel gas and to transmit heat generated in the combustion space S2. 2 chambers 7. A cylindrical space S <b> 1 formed between the columnar body P and the cylindrical body 2 is connected to the first chamber 6 and the second chamber 7.

  The first chamber 6 is a region defined by the inner cylinder 13, the top plate 15, the side wall 16, and the first partition wall 17. The first chamber 6 is not a closed space, but the first gas supply pipe 8 and the cylindrical space S1 are connected to the first chamber 6. The first gas can flow into the first chamber 6 through the first gas supply pipe 8, and the first gas can flow out of the first chamber 6 through the cylindrical space S1.

  The first gas is supplied to the first chamber 6 so as to turn around the axis X of the nozzle N in the first chamber 6. Specifically, as shown in the perspective view of FIG. 2, the first gas supply pipe 8 is connected to the first chamber 6 along the tangential direction of the first chamber 6. As a result, the first gas flowing into the first chamber 6 from the first gas supply pipe 8 flows so as to swirl inside the first chamber 6.

  The second chamber 7 is a region defined by the side wall 16, the first partition wall 17, and the second partition wall 18. The second chamber 7 is not a closed space, but the second gas supply pipe 9 and the cylindrical space S1 are connected to the second chamber 7. The second gas can flow into the second chamber 7 through the second gas supply pipe 9, and the second gas can flow out of the second chamber 7 through the cylindrical space S1.

  The second gas is supplied to the second chamber 7 so as to rotate around the axis X of the nozzle N in the second chamber 7. Specifically, as shown in the perspective view of FIG. 2, the second gas supply pipe 9 is connected to the second chamber 7 along the tangential direction of the second chamber 7. As a result, the second gas flowing into the second chamber 7 from the second gas supply pipe 9 flows so as to swirl inside the second chamber 7.

  As described above, since the first gas passes through the first chamber 6 and is supplied to the combustion space S2, the first gas is retained in the first chamber 6 before being supplied to the combustion space S2. Heating to the gas is performed. Similarly, the second gas is supplied to the combustion space S2 after passing through the second chamber 7, so that the second gas stays in the second chamber 7 before being supplied to the combustion space S2, that is, the inner gas. Heating to the second gas is performed while the gas is retained in the gas storage section 7b on the outer peripheral side having a larger flow path cross-sectional area than the merging section 7a on the peripheral side. Therefore, even if water droplets are contained in the first gas, the water droplets can be reduced or removed by evaporation while staying in the first chamber 6 before being supplied to the combustion space S2. Even if water droplets are contained in the second gas, the water droplets can be reduced or removed by evaporation while staying in the second chamber 7 before being supplied to the combustion space S2. As described above, since the water droplets contained in the first gas or the second gas are removed in the previous stage to reach the high-temperature combustion space S2, the water droplets instantly evaporate in the combustion space S2, and the flame blows off. The occurrence of this problem can be avoided and the flame can be stabilized. In particular, when the gas discharged from the fuel electrode of the fuel cell (that is, the gas in which hydrogen that has not been consumed in the power generation reaction remains) is used as the second gas, the second gas may contain water droplets. Therefore, by using the second chamber 7 having the above-described burner configuration, it is possible to effectively reduce or remove water droplets contained in the second gas by evaporation, thereby preventing misfire and the like.

  Furthermore, in this embodiment, as shown in FIG. 2, the swirl direction of the first gas in the first chamber 6 and the swirl direction of the second gas in the second chamber 7 are opposite directions. That is, the turning direction of the first gas flowing into the cylindrical space S1 while turning from the first chamber 6 and the turning direction of the second gas flowing into the cylindrical space S1 while turning from the second chamber 7 are opposite directions. become. As a result, the first gas and the second gas collide with each other in the cylindrical space S1 and the mixing of both is promoted, and the turning direction is prevented from being biased in one direction during the turning around the gas axis X. Thus, a good flame close to line symmetry in the direction of the axis X of the nozzle N can be formed.

  In the cylindrical space S <b> 1, the first gas flowing in from the first chamber 6 is mixed while the second gas is sucked from the second chamber 7, and the mixed gas of the first gas and the second gas is the axis of the nozzle N. The cylindrical space S1 flows toward the combustion space S2 along the center X direction. Specifically, the first gas flowing through the merge portion 7a of the cylindrical space S1 so that the pressure of the cylindrical space S1 in the merge portion 7a with the second chamber 7 is lower than the pressure in the second chamber 7. The flow rate is adjusted. As a result, the second gas can be effectively drawn into the cylindrical space S1 by the venturi effect.

  The 2nd chamber 7 is formed so that a flow-path cross-sectional area may become small toward the merge part 7a to cylindrical space S1. In other words, the flow passage cross-sectional area is formed so as to decrease from the outer peripheral side to the inner peripheral side of the annular second chamber 7. And the gas storage part 7b with a larger flow-path cross-sectional area than the inner peripheral side is formed in the outer peripheral side of the 2nd chamber 7. FIG. With such a configuration, the premix volume of the first gas and the second gas is reduced. As a result, it is possible to reduce the possibility of backfire when burning hydrogen having a high combustion rate contained in the second gas. Further, even if deflagration occurs, the scale can be reduced, so that the components of the burner 1 can be prevented from being deformed or damaged by deflagration. In addition, since the second gas is mixed with the first gas flowing into the cylindrical space S1 from the first chamber 6 while being sucked from the second chamber 7, the flow rate of the first gas flowing through the cylindrical space S1 is changed. The second gas is supplied to the cylindrical space S1 to some extent. That is, the ratio of the combustible gas such as hydrogen and oxygen as the fuel gas does not vary greatly. As a result, combustion can be stabilized and unburned components and carbon monoxide can be prevented from being generated.

  Furthermore, with the above configuration, the static pressure of the first gas in the first chamber 6 and the static pressure of the second gas in the second chamber 7 are once converted into dynamic pressure in the cylindrical space S1. As a result, even if there is a pressure fluctuation in the combustion space S <b> 2, the influence of the pressure fluctuation can hardly be exerted on the pressure in the first chamber 6 and the pressure in the second chamber 7.

  FIG. 3 is a diagram illustrating the structure of the spacer 10. The burner 1 includes a spacer 10 for keeping the distance between the columnar body P and the cylindrical body 2 constant. The spacer 10 can satisfactorily maintain the width of the cylindrical space S1 and can control the flow of the first gas and the second gas. In addition, the first gas and the second gas flowing through the cylindrical space S1 collide with the spacer 10 to disturb the gas flow, and as a result, the mixing of the first gas and the second gas is promoted.

  In addition, in this embodiment, the burner 1 includes a plurality of spacers 10, and at least one spacer 10a (10) swirls the gas flowing through the cylindrical space S1 in one direction around the axis X of the nozzle N. The at least one other spacer 10b (10) is configured to swirl the gas flowing through the cylindrical space S1 in the other direction around the axis X of the nozzle N. Specifically, each of the plate-like spacers 10 a and 10 b provided between the inner cylinder 13 and the cylinder 2 is provided so as to be inclined toward the tip end direction of the nozzle N. As a result, the gas flowing through the cylindrical space S1 turns around the axis X of the nozzle N while being guided in the inclination direction of the spacer 10. Furthermore, the plane including the spacer 10a and the plane including the spacer 10b are arranged so as to intersect each other. As described above, the gas is forcibly swirled by the spacers 10a and 10b provided in the cylindrical space S1, so that the gas swirling in one direction and the gas swirling in the other direction also in the cylindrical space S1. Collision occurs, which promotes mixing of the two. In addition, in the swirl around the axis X of the mixed gas, the swirl direction can be prevented from being biased in one direction, and a good flame close to line symmetry in the direction of the axis N of the nozzle N can be formed.

<Another embodiment>
<1>
In the above embodiment, the internal structure of the burner may be changed as appropriate. For example, FIG. 4 is a diagram illustrating a cross-sectional structure of a burner according to another embodiment. In the example shown in FIG. 4, the shape of the cylindrical space S1 is different from the burner described in the above embodiment. Specifically, the inner peripheral end of the first partition wall 17 is bent along the inner cylinder 13 toward the tip of the nozzle N. As a result, the first gas flows in the space formed by the inner cylinder 13 and the first partition wall 17 toward the tip of the nozzle N. Further, the end portion on the inner peripheral side of the second partition wall 18 faces the first partition wall 17 bent toward the tip direction of the nozzle N. That is, the joining portion 7 a between the second chamber 7 and the cylindrical space S <b> 1 is located on the outer peripheral side with respect to the first partition wall 17 and opens toward the tip end of the nozzle N. By adopting such a configuration, the venturi effect is further enhanced.

<2>
In the above embodiment, the number, shape, installation mode, and the like of the spacers can be changed as appropriate. In the example shown in FIG. 5, the spacers 10 c and 10 d (10) are not inclined toward the tip end direction of the nozzle N, and are installed perpendicular to the direction toward the tip end of the nozzle N (gas ejection port 3). ing. Therefore, the gas flowing through the cylindrical space S1 is not swung in a predetermined direction by the spacers 10c and 10d, but the gas collides with the spacers 10c and 10d and the flow is disturbed. As a result, the first gas and the second gas Is promoted.
Although not shown, the spacers 10a and 10b illustrated in FIG. 3 are provided so as to be parallel to each other, that is, the gas flowing through the cylindrical space S1 is swung in the same direction by the spacers 10a and 10b. Also good. In addition, a change in which three or more spacers 10 are provided or a change in which only one spacer 10 is provided is possible.
Even if the gas flowing through the cylindrical space S1 is swung only in one direction by one spacer 10 or by a plurality of spacers 10, the cylindrical space S1 is provided as long as the collision object 11 is provided. When the gas swirling the gas collides with the collision object 11, at least the swirling is weakened. That is, even if the swirl direction of the gas in the cylindrical space S1 is deviated in one direction, the collision target 11 can correct that the gas is jetted into the combustion space S2 in the strongly deviated swirl direction. it can.

<3>
In the said embodiment, the connection form of the center electrode 12a of the ignition plug 12 and the conductor rod 22 can be changed suitably. For example, in the above embodiment, the example in which the center electrode 12a of the ignition plug 12 and the conductor rod 22 are electrically connected via the conductive elastic body 23 has been described. However, ignition is performed without using the conductive elastic body 23. You may change so that the center electrode 12a of the plug 12 and the conductor rod 22 may be electrically connected. For example, the center electrode 12a of the spark plug 12 and the conductor rod 22 may be welded, and both may be electrically and structurally connected by welding.

<4>
In the above embodiment, the first gas containing oxygen is supplied to the first chamber 6 and the second gas containing hydrogen as the fuel gas is supplied to the second chamber 7. It may be used in an embodiment. For example, a mixed gas of air containing oxygen and hydrocarbon gas (for example, city gas containing methane or the like) may be supplied to the first chamber 6 as the first gas. That is, even if the amount of combustible gas such as hydrogen contained in the second gas is small or no combustible gas is contained, at least in the combustion space S2 using the hydrocarbon gas supplied as the first gas as fuel. The combustion of the hydrocarbon gas can be performed.
In addition, a route different from the supply route through the first chamber 6 may be prepared as a supply route of oxygen to the combustion space S2.

  INDUSTRIAL APPLICABILITY The present invention can be used for a burner that can reduce the possibility of misfire or deflagration while stably burning a fuel gas containing hydrogen.

DESCRIPTION OF SYMBOLS 1 Burner 2 Cylindrical body 3 Gas ejection port 4 High voltage electrode part 5 Counter electrode part 6 1st chamber 7 2nd chamber 7a Merge part 7b Gas storage part 8 1st gas supply pipe 9 2nd gas supply pipe 10 Spacer 11 Collision Body (opposite electrode part 5)
DESCRIPTION OF SYMBOLS 12 Spark plug 12a Center electrode 12b Ground electrode 12c Insulator 13 Inner cylinder 14 Insulating refractory material 15 Top plate 16 Side wall 17 First partition 18 Second partition 19 Outer wall 20 Combustion exhaust gas passage 21 Folding part 22 Conductor rod (High voltage electrode part) 4)
23 conductive spring 30 reforming processing section F ignition means N nozzle P columnar body S1 cylindrical space S2 combustion space X axis

Claims (13)

A gas having a columnar body and a cylindrical body surrounding the outer peripheral surface of the columnar body, and at least fuel gas is ejected into the cylindrical combustion space through the cylindrical space formed between the columnar body and the cylindrical body A nozzle having a spout;
A spark is generated between a high voltage electrode portion provided on the tip side of the nozzle exposed to the combustion space and applied with a high voltage, and a counter electrode portion provided in proximity to the high voltage electrode portion. An ignition means for igniting the fuel gas ejected from the gas ejection port,
A first chamber formed in an annular shape around an axis of the nozzle, configured to be supplied with a first gas containing oxygen and to transmit heat generated in the combustion space;
A second chamber formed in an annular shape around the axis of the nozzle and configured to be supplied with a second gas containing hydrogen as the fuel gas and to transmit heat generated in the combustion space; Prepared,
The cylindrical space formed between the columnar body and the cylindrical body is connected to the first chamber and the second chamber,
The second chamber is formed such that a cross-sectional area of the flow path becomes smaller toward a joining portion to the cylindrical space,
The second gas is mixed with the first gas flowing into the cylindrical space from the first chamber while being sucked from the second chamber, and the mixed gas of the first gas and the second gas is mixed with the cylinder. Burner flowing toward the combustion space. The first gas is supplied to the first chamber so as to swivel around an axis of the nozzle in the first chamber;
2. The burner according to claim 1, wherein the second gas is supplied to the second chamber so as to swivel around an axis of the nozzle in the second chamber.   The burner according to claim 2, wherein the swirling direction of the first gas in the first chamber is opposite to the swirling direction of the second gas in the second chamber.   The burner as described in any one of Claims 1-3 provided with the spacer for keeping the distance between the said columnar body and the said cylindrical body constant.   The burner according to claim 4, wherein the spacer is configured to swirl the gas flowing through the cylindrical space in one direction around the axis of the nozzle. A plurality of the spacers;
At least one of the spacers swirls the gas flowing through the cylindrical space in one direction around the axis of the nozzle,
The burner according to claim 4, wherein the at least one other spacer turns the gas flowing through the cylindrical space in the other direction around the axis of the nozzle.   A collision target that collides with at least a part of a mixed gas of the first gas and the second gas ejected from the gas ejection port of the nozzle to the combustion space is provided in the vicinity downstream of the gas ejection port; The burner according to any one of claims 1 to 6, wherein the collision target is configured to have air permeability.   The burner according to claim 7, wherein the collision target body and the cylindrical body are configured using a conductive material, and the collision target body is electrically connected to the cylindrical body and is used as the counter electrode unit.   The flow rate of the first gas flowing through the confluence portion of the cylindrical space is adjusted so that the pressure of the cylindrical space at the confluence portion with the second chamber is lower than the pressure in the second chamber. The burner according to any one of claims 1 to 8. The combustion space is disposed adjacent to a reforming processing unit for generating a hydrogen-containing gas to be supplied to the fuel cell by reforming the raw fuel gas,
The burner according to any one of claims 1 to 9, wherein combustion heat generated in the combustion space is used for heating the reforming unit. The ignition means has a spark plug having a center electrode and a ground electrode,
The center electrode of the spark plug is electrically connected to a conductor rod functioning as the high voltage electrode portion exposed to the combustion space,
The burner according to any one of claims 1 to 10, wherein the ground electrode of the spark plug is electrically connected to the counter electrode portion.   The burner according to claim 11, wherein the center electrode of the spark plug and the conductor rod are electrically connected with a conductive elastic body in between.   The burner according to claim 11, wherein the center electrode of the spark plug and the conductor rod are electrically and structurally connected by welding.

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