JP4615349B2 - How to use the gas burner - Google Patents

Description

  The present invention relates to a method for using a gas burner, and more particularly to a method for using a gas burner suitable for production, decoration, lighting, exhibition, and the like.

  Conventionally, for example, a gas burner for a bonfire device is known as a gas burner used in a device aiming at a red and yellow flame found in incomplete combustion, a so-called bright flame effect (see Patent Document 1).

  In this gas burner for a bonfire, a jet nozzle that generates a flame due to incomplete combustion protrudes from the upper end of a support column into which a gas pipe is inserted, and a net-like inner windshield cover is attached to the outer periphery of the jet nozzle. Similarly, a net-like outer windshield cover is attached to the outer periphery of the.

  However, since this gas burner is used for a bonfire, it can form a flame with a wide spread, but it cannot form a steady flame like a candle with little flame fluctuation.

  Therefore, the present applicant can form a long luminous flame with little fluctuation of the flame mainly by optimizing the shape of the gas nozzle and the effect of rectifying the combustion air by arranging the draft tube on the outer periphery of the gas nozzle. A gas burner has been developed and a patent application has already been filed (see Patent Document 2).

JP 11-339502 A Japanese Patent Application No. 2003-431730

  With this gas burner alone, there is little flame fluctuation and a long luminous flame can be formed. However, when this gas burner is installed in a place where there is an airflow flowing upward from below the burner, the rising airflow may make the flame easily fluctuate, and it is necessary to take measures against it.

  More specifically, for example, when the gas burner is installed in a machine room under the stage, and a flame is to be formed in the space on the stage, the machine room passes through a gap formed around the draft pipe. The airflow that blows through to the space on the stage may be generated.

  For this reason, the corner gas burner alone has little flame fluctuation and can form a long luminous flame. However, depending on the installation location of the burner, the flame of the gas burner is likely to fluctuate due to the influence of the blow-by airflow. .

  Therefore, the problem to be solved by the present invention is to provide a method of using a gas burner that can easily form a long luminous flame with little flame fluctuation even when there is an airflow flowing upward from below the burner.

In order to solve the above-mentioned problems, a method of using a gas burner according to the present invention includes a gas introduction pipe for introducing a flammable gas and a tip of the gas introduction pipe, and one or more flame holes at the top thereof. A gas nozzle that covers the outer periphery of the gas nozzle, has a tip side taper from the middle part, and a base end side formed in a substantially cylindrical shape, and a flammable gas ejected from the gas nozzle in the draft pipe. and at least comprises a gas burner use of an ignition device which performs spark, and a burner installation space in which the a flame formation space flames ejected from the gas burner are formed gas burner is installed to partition is the partition together with the gas burner installed in the burner installation space has, the surrounding draft tube gap formed in this partition part, the fire from the burner installation space It blows towards the forming space and gist placing a rectifying member for rectifying the blow air flow causing turbulence of the flame.

  At this time, the rectifying member is preferably in a lattice shape.

  Moreover, it is preferable that the velocity of the airflow flowing from the lower side of the burner to the upper side is relatively larger than the velocity of the airflow flowing in the lateral direction of the flame by adjusting the hole diameter of the rectifying member.

  The gas burner to be used is such that the top of the gas nozzle is disposed at the tapered portion of the draft tube, and the flame hole is a projection in which the tip opening of the draft tube is vertically projected on the surface including the top of the gas nozzle. Formed in the plane, the diameter of the flame hole is in the range of 0.1 to 3.0 mm, and when two or more flame holes are formed, the pitch of the flame hole is in the range of 1 to 10 mm. Preferably there is.

  The ignition device is preferably a ceramic heater or a seed fire gas burner.

  According to the method for using the gas burner according to the present invention, the gas burner is installed separately from the flame forming space, and the rectifying member is arranged in the gap around the draft pipe formed in the partitioned portion.

  Therefore, it is possible to rectify the airflow that blows through from the partition space on the side where the gas burner is installed to the flame formation space through the gap around the draft tube.

  Thereby, the spatial velocity unevenness of the blow-by airflow is suppressed, and the inclination of the bright flame formed in the flame formation space is reduced. Further, since the temporal speed unevenness is also suppressed, the air speed unevenness involving the bright flame is suppressed, the combustion reaction proceeds uniformly on the outer surface of the flame, and the flame surface can be prevented from being disturbed. As a result, it is possible to suppress the fluctuation of the entire flame.

  At this time, if the rectifying member is in a lattice shape, the rectifying action of the airflow flowing from the lower side of the burner to the upper side is excellent.

  Further, by adjusting the hole diameter of the rectifying member, when the velocity of the airflow flowing from the lower side of the burner to the upper side is relatively larger than the velocity of the airflow flowing in the lateral direction of the flame, Since the velocity of the airflow flowing in the flame becomes small, the flame can be burned more stably.

  Here, the top surface of the gas nozzle of the gas burner to be used is disposed in the tapered portion of the draft tube, and the projection surface is a projection surface in which the flame hole is on the surface including the top portion of the gas nozzle and the tip end opening of the draft tube is vertically projected. If the diameter of the flame hole is in the range of 0.1 to 3.0 mm and two or more flame holes are formed, the pitch of the flame hole is in the range of 1 to 10 mm. If it is, it will be easy to form a long luminous flame as a gas burner simple substance with little flame fluctuation. Therefore, coupled with the effect of arranging the rectifying member, even when there is an airflow flowing upward from below the burner, it is easier to form a long luminous flame with less flame fluctuation.

  Further, if the ignition device is a ceramic heater or a seed gas burner, it is excellent in silent ignitability, so that it is excellent in production effects.

  Below, the usage method (henceforth "this usage method") of the gas burner which concerns on this embodiment is demonstrated.

1. 1. Gas burner used in this method of use 1.1 Configuration of gas burner First, the configuration of a gas burner that can be suitably used in this method of use will be exemplified. FIG. 1 is a cross-sectional view showing a schematic configuration of a gas burner that can be suitably used in this method of use.

  The gas burner 10 basically communicates with a gas introduction pipe 11 for introducing a combustible gas, and a tip of the gas introduction pipe 11, and one or more flame holes 16 are formed at the top portion 17. The gas nozzle 12, the outer periphery of the gas nozzle 12, a draft pipe 13 having a tapered end on the middle and a substantially cylindrical shape on the proximal end, and ignition for igniting the combustible gas ejected from the gas nozzle 12 And at least a device 14. Hereinafter, each configuration will be described in detail.

  In the gas burner 10, the gas introduction pipe 11 is formed in a substantially cylindrical shape with a material such as cast iron, for example, and upstream of the base end portion via a gas flow regulator (not shown) such as a gas governor. A combustible gas source (not shown) disposed on the side is connected. As a result, the pressure-adjusted desired combustible gas (all combustible gases such as city gas, natural gas, and propane gas) can be drawn into the gas introduction pipe 11. On the other hand, the gas nozzle 12 is attached to the distal end portion of the gas introduction pipe 11 via a joint member 15 whose diameter is gradually increased upward.

Here, the gas pressure of the combustible gas introduced into the gas introduction pipe 11 is appropriately adjusted in consideration of the balance with the flame height and the like, but is 1 × 10 ⁻³ to 1 × 10 ⁶ Pa, preferably 1 × 10. ⁻² to 1 × 10 ⁵ Pa, more preferably 1 × 10 ⁻¹ to 1 × 10 ⁴ Pa. The combustion range is preferably adjusted within a range of 0.001 to 35 Kw, preferably 0.01 to 30 Kw, more preferably 0.1 to 10 Kw.

  In the gas burner 10, the gas nozzle 12 is formed in a substantially cylindrical shape from a material such as stainless steel or brass, for example, and a top portion 17 having one or two or more flame holes 16 is provided at the tip thereof. As a whole, the mouth is closed. On the other hand, the base end portion of the gas nozzle 10 communicates with the gas introduction pipe 11 through the joint member 15 and the like described above, and the combustible gas introduced into the gas introduction pipe 11 is supplied into the gas nozzle 12. ing.

  Here, the top 17 of the gas nozzle 12 has one flame hole 16 having a diameter of 0.1 to 3.0 mm, preferably 0.1 to 2.0 mm, more preferably 0.3 to 1.5 mm. One or two or more may be formed. The diameter of the flame hole 16 can be appropriately selected from the above range in consideration of the calorific value of the combustible gas used. When the diameter of the flame hole 16 is smaller than 0.1 mm, the stability of a long flame is deteriorated, and there is a tendency that problems such as difficulty in maintenance occur. On the other hand, when the diameter of the flame hole 16 is larger than 3.0 mm, the flame height tends to be shortened or the vicinity of the flame root tends to be disturbed. Therefore, these should be noted.

  When two or more flame holes 16 are formed, the flame hole pitch is in the range of 1 to 10 mm, preferably 2 to 8 mm, and more preferably 3 to 7 mm. When the flame hole pitch is smaller than 1 mm, there is a tendency that the vicinity of the flame is disturbed. On the other hand, when the flame hole pitch is larger than 10 mm, there is a tendency that the flame is not divided and thickened. Therefore, these should be noted.

  Moreover, the flame hole 16 can be arrange | positioned by shapes, such as a linear form, a grid | lattice form, and circular shape (donut shape), for example. Preferably, the flame holes 16 are preferably arranged in a lattice form from the viewpoint of taking a large amount of combustion air inflow. FIG. 2 shows an example of the arrangement of the flame holes. The gas nozzle 12 shown in FIG. 2 has, for example, four vertical rows and four horizontal rows, a total of 16 flame holes 16 arranged in a lattice pattern on the top 17 of the gas nozzle 12. In addition, it cannot be overemphasized that flame hole arrangement | positioning may be the grid | lattice form of vertical multiple rows x horizontal multiple rows other than vertical 4 rows x horizontal 4 rows.

  In the gas burner 10, the draft pipe 13 is provided on the outer periphery of the gas nozzle 12. The draft tube 13 is formed of, for example, a material such as stainless steel, the tip side is tapered from the middle part and the base end side is formed in a substantially cylindrical shape, and combustion air can be taken in from the base end opening. Yes.

  The draft tube 13 may be arranged so that the top portion 17 of the gas nozzle 12 is located at a tapered portion of the draft tube 13. Preferably, it is good to arrange in the middle part of the taper part. The draft tube 13 is fixed by, for example, inserting a plurality of fastening members 18 such as butterfly bolts from the outside of the draft tube 13 and fastening them to a fixing member 19 such as a virgin claw attached around the gas nozzle 12. Just do it.

  The height of the draft tube 13 is 10 to 2000 mm, preferably 50 to 1500 mm, and more preferably 100 to 1000 mm. When the height of the draft tube 13 is smaller than 10 mm, the flame tends to be disturbed. On the other hand, when the height of the draft tube 13 is larger than 2000 mm, the effect of preventing the flame disturbance tends to reach a peak. Therefore, these should be noted. The cylinder diameter on the proximal end side of the draft tube 13 is not particularly limited as long as a space portion is secured so as not to hinder the flow of combustion air when the fixing member 19 is attached.

  Here, in the gas burner 10, the relationship between the flame hole 16 at the top 17 of the gas nozzle 12 and the tip opening 20 of the draft pipe 13 is preferably as follows. That is, the flame hole 16 at the top 17 of the gas nozzle 12 is included in the projection plane when the front end opening 20 of the draft pipe 13 is projected vertically on the surface including the top 17 of the gas nozzle 12. It should be formed. In this case, all the flame holes 16 formed in the top portion 17 can be visually recognized by vertically looking into the top portion 17 of the gas nozzle 12 from the tip opening 20 of the draft tube 13.

  For example, if the relationship between the flame hole 16 at the top portion 17 of the gas nozzle 12 and the tip opening 20 of the draft tube 13 is specifically illustrated for the gas nozzle 12 shown in FIG. All 16 flame holes 16 are arranged inside the inner diameter of the tip opening 20.

  The reason why such a flame hole arrangement is preferable is as follows. First, it is for making combustion air flow in between each flame hole. Secondly, near the base of the flame, a blue flame is formed by this combustion air, and the combustion is stable and it is difficult for a phenomenon such as blow-off to occur. Thirdly, if the flame hits the inner wall 21 of the draft pipe 13, heat exchange occurs in that portion, and the draft effect is difficult to work due to less inflow of air and the rectifying action in the draft pipe 13 is weak. This is to prevent this.

  In the gas burner 10, the ignition device 14 is attached to the outside of the draft pipe 13, and the ignition portion 22 is inserted into the draft pipe 13 and disposed above the gas nozzle top 17. Specific examples of the ignition device 14 include a ceramic heater and a seed fire gas burner. This is because these are excellent in silent ignitability and the like, and are excellent in production effects. More preferably, since there is an advantage that ignition can be performed with almost no spark noise, a ceramic heater using silicon nitride or the like can be suitably used.

1.2 Operation of Gas Burner Single Unit Next, the operation of the gas burner 10 single unit having the above configuration will be described. According to the gas burner 10, the combustible gas introduced into the gas nozzle 12 from the gas introduction pipe 11 is ejected from the flame hole 16 of the gas nozzle top portion 17. When the ejected gas is ignited by the ignition device 14, a bright flame is formed above the gas nozzle 12.

  Here, in the gas burner 10, one or more flame holes 16 having a diameter of 0.1 to 3.0 mm are formed in the top portion 17 of the gas nozzle 12, and two or more flame holes 16 are further formed. In this case, when the flame hole pitch is in the range of 1 to 10 mm, the gas ejection speed from the flame hole 16 is easily uniformized. Further, even if two or more flame holes 16 are formed, it is possible to form a flame that is difficult to be divided, is thick, and has little disturbance in the root portion.

  Further, the outer periphery of the gas nozzle 12 is provided with a draft pipe 13 having a tapered end on the middle and a substantially cylindrical base end side. A strong upward air flow is generated around the flame. Therefore, the flow velocity around the jet flame is made uniform, the velocity gradient around the flame is reduced, the generation of vortices is suppressed, and the turbulence of the flame is suppressed. In this case, if the top portion 17 of the gas nozzle 12 is disposed at the tapered portion of the draft tube 13, the above-described effect is excellent.

  Further, when the flame hole 16 at the top portion 17 of the gas nozzle 12 is formed on the plane including the top portion 17 of the gas nozzle 12 and in a projection plane in which the tip end opening 20 of the draft tube 13 is vertically projected, It is difficult for the flame from the flame hole 16 to touch the inner wall of the draft tube 13. Therefore, in this case, it becomes easier to suppress the disturbance of the flame.

  Therefore, the gas burner alone is mainly designed to optimize the gas nozzle shape and rectify the combustion air, so even if a long luminous flame is formed by adjusting the gas flow rate, the fluctuation of the flame Is extremely low.

  Next, this usage method using this type of gas burner will be described. When using the gas burner in a place where there is an airflow flowing upward from the bottom of the burner, or in a place where there is an airflow flowing in the horizontal direction of the burner flame, etc. This is a method for further suppressing the influence of the gas burner and further enhancing the action of the gas burner. This will be described in detail below.

2. This Usage Method In this usage method, the gas burner is installed separately from the flame forming space, and a rectifying member is arranged in a gap around the draft pipe formed in the partitioned portion.

  Here, in this usage method, the flame forming space refers to a space in which a flame ejected from the gas burner is formed. Specifically, for example, when the gas burner is used in a production stage, the space on the production stage corresponds to this.

  Therefore, the installation of the gas burner separately from the flame formation space means that the flame formation space and the installation space of the gas burner are partitioned by a partition wall or the like, and the gas burner main body is mainly installed at a place other than the flame formation space. . Specifically, for example, a case where a gas burner main body is mainly installed in a machine room under a production stage and a flame by the gas burner is formed on the production stage can be exemplified.

  At this time, a part of the gas burner main body may protrude into the flame forming space. Preferably, from the viewpoint of appearance and the like, the gas burner main body may be arranged such that the tip opening of the draft tube is in the vicinity of the partition portion.

  Further, in this method of use, the gap around the draft tube formed in the partition part is the vicinity of the boundary between the flame formation space and the burner installation space and the members constituting the burner installation space and the outer surface of the draft tube. It means mainly the gap formed between them. In addition, as a member which comprises burner installation space, the said partition wall, the heat insulation member arrange | positioned around a burner, a burner fixing member etc. can be illustrated, for example.

  In general, this type of gap has an airflow (hereinafter referred to as “blow-off airflow”) that flows from a space below the compartment (burner installation space) to a space above the compartment (flame formation space). Often occurs). In this method of use, the airflow flowing through this gap is rectified.

  In this method of use, the rectifying member may be installed over substantially the entire area of the gap. Here, the rectifying member can be used without particular limitation as long as it is a member having a large number of holes through which a blow-by airflow is passed. Examples of the shape of the rectifying member include a lattice shape (eg, regular lattice, oblique lattice), a honeycomb shape (hexagonal shape, octagonal shape, other polygonal shape), and a porous shape. Preferably, the shape of the rectifying member is a lattice shape. It is because it is excellent in the rectification action of the blow-by airflow. Specific examples of the rectifying member include a wire net, a honeycomb body, and a porous body. In addition, since many metal net | networks with which the number of meshes, ie, a hole diameter differ, are marketed easily and can be obtained easily, they can be used especially suitably.

  Here, as for the said rectification | straightening member, generally the tendency for the speed nonuniformity of a blow-by air current to become small becomes small as the hole diameter becomes small. On the other hand, there is a tendency that the velocity of the blow-by airflow increases as the hole diameter increases. Therefore, the blow-by airflow may be rectified within a favorable range by appropriately adjusting the hole diameter of the rectifying member.

  In this case, for example, when there is an airflow flowing in the flame lateral direction in the flame forming space such as on the stage, the blow-by airflow is adjusted rather than the velocity of the airflow flowing in the flame lateral direction when adjusting the hole diameter of the rectifying member. It is better to relatively increase the speed of. In such a case, the velocity of the airflow flowing in the flame lateral direction becomes relatively small, so that the flame can be burned more stably.

  Hereinafter, the present invention will be described in detail with reference to examples. First, a gas burner having the shape shown in FIGS. 4 and 5 was produced. The gas nozzle was made of brass, and the draft tube was made of SUS304 having a thickness of 0.8 mm. A flame monitoring device (UV) was installed at the bottom of the draft tube.

  Next, a luminous flame was formed using the obtained gas burner. At this time, 13A gas was used as the combustible gas, and the gas pressure was 0.2 KPa.

  FIG. 6 shows the result. As shown in FIG. 6, it can be seen that the produced gas burner alone can form a long luminous flame of about 40 cm with very little fluctuation.

  Next, the produced gas burner was installed on the stage for production. That is, as shown in FIG. 7, the gas burner 10 is placed in the machine room 31 under the stage 30 so that the tip opening 20 of the draft tube 13 of the gas burner 10 is almost the same height as the stage 30. Was installed. Insulating members 32 a to 32 c are arranged around the gas burner 10.

  At this time, the gap 34 between the inner peripheral surface of the heat insulating member 32a held by the holding member 33 and the outer surface of the draft tube 13 of the gas burner 10 was about 135 mm.

  Next, the state of the blow-through air flowing through the gap 34 was examined. That is, as shown in FIG. 8, at the measurement points A, B, C, and D (position of about 5 mm from the inner peripheral surface of the heat insulating member 32a), the blown air velocity was measured and the state of the flame was observed. The flame formation conditions are the same as described above.

  The results are shown in Table 1 and FIG.

  According to Table 1, spatial velocity unevenness in which a difference occurs in the average blow-through air velocity at measurement points A, B, C, and D, and temporal velocity unevenness at each measurement point are generated. I understand. Further, when the rectifying member is not disposed in the gap, as shown in FIG. 9, it can be seen that the flame is very unstable and easily disturbed, and the flame cannot be formed sharply and stably.

  As schematically shown in FIG. 10, when the rectifying member is not disposed in the gap portion, (1) the difference in the speed of the blown air 36 before and after the flame 35 due to spatial speed unevenness. Occurs (arrow A1 in the figure), the flame 35 tilts back and forth, right and left, (2) vortices are locally generated due to temporal speed variations (arrow A2 in the figure), and the flame surface is disturbed. This is presumed to be due to this.

  Next, as shown in FIG. 11, a wire mesh 37 (mesh number 16) as a rectifying member is disposed in the gap 34 on the outer periphery of the draft tube 13, and at the measurement points A, B, C, and D in the same manner as described above. The air velocity was measured and the flame was observed.

  The results are shown in Table 2 and FIG.

  According to Table 2 and Table 1, by arranging the wire mesh 37, the spatial velocity unevenness of the blow-by air is suppressed at the measurement points A, B, C, D (standard deviation 0.34 → 0.15). , The inclination of the flame disappeared. In addition, temporal speed unevenness is suppressed, and by suppressing the air speed unevenness of the flame (average value of temporal speed unevenness 0.31 → 0.12), the combustion reaction proceeds uniformly on the flame outer surface. It was possible to suppress the disturbance of the flame surface. As a result, as shown in FIG. 12, the fluctuation of the whole flame was suppressed.

  This is because the blown-out air 36 from the inside of the machine room 31 could be rectified by the wire mesh 37 as a rectifying member, as schematically shown in FIG.

  Next, the number of meshes of the wire mesh was changed from 16 to 12 (the hole diameter was increased), and measurement point A was applied in the same manner as above except that a cross wind of 0.4 m / s was applied to the flame formed on the stage. , B, C, and D were measured for blow-by air velocity. The results are shown in Table 3.

  According to Tables 3 and 2, it can be seen that the larger the number of meshes, that is, the smaller the hole diameter of the wire mesh, the smaller the temporal velocity unevenness of the blow-through air and the better the flame stability. It can also be seen that the smaller the number of meshes, that is, the larger the hole diameter of the wire mesh, the higher the blow-by air velocity, and the relatively less affected by crosswinds, and the more stable the flame. When the cross wind applied to the flame was 0.4 m / s, the optimum number of meshes of the wire mesh was 12-16.

  Although the method for using the gas burner according to the present embodiment has been described above, the above embodiment does not limit the present invention in any way, and various modifications and improvements can be made without departing from the scope of the present invention.

  For example, in the above embodiment, a wire mesh is used as the rectifying member. However, a honeycomb body, a porous body, or the like may also be used, and is not particularly limited.

It is sectional drawing which showed schematic structure of the gas burner which can be used suitably for this usage method. It is the figure which showed the gas nozzle which formed in a lattice form the total 16 flame holes in the top part by 4 rows and 4 rows. It is the figure which showed the relationship between the flame hole of a gas nozzle top part, and the front-end | tip part opening of a draft pipe about the gas nozzle shown in FIG. It is the figure which showed the shape of the gas burner used for the Example. It is the figure which showed the shape of the gas nozzle top part of the gas burner used for the Example. It is a figure at the time of forming a luminous flame with the gas burner simple substance used for the Example. It is sectional drawing which showed the state which installed the gas burner in the stage for production. It is the figure which showed the measurement point at the time of investigating the blow-by air speed which flows into a clearance gap. It is the figure which showed the flame formed on the stage for production when the member for rectification | straightening is not arrange | positioned. It is the figure which showed typically the flame formed on the stage for production when the member for rectification | straightening is not arrange | positioned. It is sectional drawing which showed the state which installed the gas burner in the stage for production | presentation, and has arrange | positioned the metal mesh as a rectification | straightening member in the clearance gap. It is the figure which showed the flame formed on the stage for production when the member for rectification | straightening is arrange | positioned. It is the figure which showed typically the flame formed on the stage for production when the member for rectification | straightening is arrange | positioned.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Gas burner 11 Gas introduction pipe 12 Gas nozzle 13 Draft pipe 14 Ignition device 16 Flame hole 17 Top part 20 Tip part opening 21 Inner wall 30 Production stage 31 Machine room 32a-c Heat insulation member 33 Holding member 34 Gap 35 Flame 36 Blow-through air 37 Rectification member (Wire mesh)

Claims (5)

A gas introduction pipe for introducing a flammable gas, a gas nozzle communicated with the tip of the gas introduction pipe and having one or more flame holes formed at the top thereof, covering the outer periphery of the gas nozzle, A method of using a gas burner comprising at least a draft pipe having a tapered front end and a substantially cylindrical base end , and an ignition device for igniting a combustible gas ejected from the gas nozzle in the draft pipe. ,
And partitions the burner installation space in which the a flame formation space flames ejected from the gas burner are formed gas burner is installed, as well as placing the gas burner to the compartmented burner installation space,
The surrounding draft tube gap formed in this compartment, placing the rectification member for rectifying the blow air flow causing turbulence of the flame from the burner installation space blows toward said flame formation space A method of using a gas burner characterized by that.   The method of using a gas burner according to claim 1, wherein the rectifying member has a lattice shape.   The speed of the airflow flowing upward from the lower side of the burner is made relatively larger than the speed of the airflow flowing in the lateral direction of the flame by adjusting the hole diameter of the rectifying member. How to use the gas burner.   The top of the gas nozzle is disposed at a tapered portion of the draft tube, and the flame hole is on a plane including the top of the gas nozzle and is in a projection plane obtained by vertically projecting the tip opening of the draft tube. Formed, the diameter of the flame hole is in the range of 0.1 to 3.0 mm, and when two or more flame holes are formed, the flame hole pitch is in the range of 1 to 10 mm. The method of using a gas burner according to any one of claims 1 to 3.   The method of using a gas burner according to any one of claims 1 to 4, wherein the ignition device is a ceramic heater or a seed gas burner.