JP4808133B2 - Gas burner - Google Patents

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JP4808133B2
JP4808133B2 JP2006297697A JP2006297697A JP4808133B2 JP 4808133 B2 JP4808133 B2 JP 4808133B2 JP 2006297697 A JP2006297697 A JP 2006297697A JP 2006297697 A JP2006297697 A JP 2006297697A JP 4808133 B2 JP4808133 B2 JP 4808133B2
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gas
air
laval nozzle
combustion
portion
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JP2008116077A (en
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聡 吉本
博規 小西
伸章 林本
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株式会社タクマ
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Description

  The present invention relates to a gas burner that enables multistage combustion by recirculation of exhaust gas and division of combustion air with a simple structure and can reduce the NOx concentration.

  Conventionally, various proposals have been made for techniques for reducing harmful combustion exhaust materials generated by combustion in combustion equipment and the like, particularly for techniques for reducing NOx. As an example, in the method of supplying combustion air by dividing it into primary and secondary, a partially premixed gas burner is used to form a thin-film cylindrical premixed airflow in the downstream area of the premixed gas outlet. The secondary air for combustion is subdivided and ejected from the outside toward the premixed airflow, and a large number of small flames are formed to completely burn without generating a local high temperature portion, thereby reducing NOx. A method is known from US Pat.

  In this conventional technique, as described above, the secondary air is diverted from the primary air supply line and blown into the primary combustion section through a large number of small holes so that secondary combustion is simultaneously performed in the primary combustion section. Has been. Therefore, combustion exhaust gas and secondary air cannot be mixed and supplied to the combustion section for complete combustion. In addition, since it is difficult to improve the straightness of the flame, for example, when a burner is used for a small once-through boiler, there is a problem that it is difficult to improve the combustion efficiency.

  Therefore, as shown in FIGS. 8 (a) and 8 (b), the present inventors are provided with a Laval nozzle forming portion 60 at a position extending coaxially with the fuel injection port 52 within the distal end portion of the outer cylinder 50, and forming the Laval nozzle. A diverted air circulation part 54 is formed between the outer peripheral edge 62 of the suction part 61 of the part 60 and the inner surface 50a of the outer cylinder 50, and in front of the diffuser 64 outlet connected to the throat part 63 of the Laval nozzle forming part 60, A gas burner 70 having a structure in which a secondary combustion gas suction portion 65 having a plurality of secondary combustion gas suction holes 66 formed by mixing air branched from the circulation portion 54 and combustion exhaust gas is provided (Japanese Patent Application 2006). -11936). The gas burner 70 configured in this way has a simple configuration and can perform multistage mixing by recirculation of exhaust gas and division of combustion air to increase combustion efficiency, achieve complete combustion, and achieve low NOx, such as a small once-through boiler Thus, even when the flame flow path is narrow, the flame shape and the combustion state are hardly affected, and it is effective by performing effective combustion. In the figure, black arrows indicate fuel gas, white arrows indicate air, and hatched arrows indicate air-fuel mixture.

Japanese Patent No. 3417367

  However, the gas burner 70 according to the invention of the prior application is effective if the cross section orthogonal to the combustion gas traveling direction of the combustion chamber is circular or square (aspect ratio is 1: 1), but the cross section of the combustion chamber is rectangular. When the aspect ratio is large (for example, the combustion chamber is long and narrow), the exhaust gas recirculation flow in the width direction (lateral direction) becomes weak, or the flame reaches the heat transfer surface at the upper and lower ends in the vertical direction. There is a problem that heat transfer is not performed effectively.

  The present invention has been made to solve such problems, and it is an object of the present invention to provide a gas burner that functions effectively corresponding to a combustion chamber having a cross section with a large aspect ratio.

In order to achieve the above object, a gas burner according to the present invention comprises:
In a gas burner equipped with a mixing means in the form of a Laval nozzle,
A Laval nozzle forming portion is provided at a coaxial line extending position with the fuel gas supply means in the distal end portion of the outer cylinder, and a shunt air circulation portion is formed between the suction portion opening edge of the Laval nozzle forming portion and the inner surface of the outer cylinder, It has a structure in which a suction part for a secondary combustion gas is provided in front of the diffuser outlet of the Laval nozzle forming part by mixing the air branched in the diverted air circulation part and the combustion exhaust gas, and the mixed gas outlet of the Laval nozzle forming part is injected It is characterized by being elongated in a direction crossing the direction (first invention).

  In the above invention, the fuel gas supply means may be provided with a single stage or multiple stages so that the fuel gas injection holes intersect the air flow (second invention). In addition, the fuel gas supply means may be configured to change the mixture ratio of air and fuel gas by moving back and forth in the axial direction with respect to the Laval nozzle forming portion (third invention).

The gas burner according to the fourth invention is
In a gas burner comprising a mixing means having a Laval nozzle forming part,
The mixing means has a fuel gas supply means arranged in the suction portion of the Laval nozzle forming portion so as to coincide with the axial center line thereof, and a gas ejection hole of the fuel gas supply means is arranged between the inner surface of the suction portion and the fuel gas supply means. Opened downstream from the opening edge in the air circulation part formed between the side and the side of the diffuser outlet, the combustion exhaust gas suction part is provided in front of the diffuser outlet. It is characterized by being elongated in the direction intersecting with.

  According to the first invention, when the burner is formed in an elongated shape, for example, if the burner is arranged vertically, the suction portion for the secondary combustion gas by mixing the divided air and the combustion exhaust gas at the tip of the burner becomes vertically long. Therefore, the exhaust gas recirculation can be performed uniformly from the suction portion of the secondary combustion exhaust gas. In addition, the flame reaches the upper and lower ends of the combustion chamber, the flame is burned in a state where the length is long and the width is narrow, the surface area of the flame is increased, and heat absorption to the heat transfer surface is effectively performed. Play.

Further, in the present invention, unlike the prior invention, the mixing of the air and the fuel gas is promoted by jetting the fuel gas so as to intersect the air supplied by the fuel gas supply means. Can do. In addition, by moving the fuel gas supply means back and forth in the axial direction to change the gap formed between the opening edge of the suction part of the Laval nozzle forming part and the fuel gas supply means, the primary air flowing to the Laval nozzle forming part is obtained. The combustion state can be adjusted by changing the amount and changing the ratio with the amount of secondary air to be diverted. In other words, the primary air amount can be adjusted. Further, by providing gas ejection holes in the fuel gas supply means on the upstream side and the downstream side in the axial direction, primary and secondary air-fuel mixtures can be generated for the combustion section. By doing so, different air ratios can be set. Also, by changing the area ratio between the upstream gas outlet hole and the downstream gas outlet hole to change the gas injection amount ratio, the primary and secondary air ratio can be adjusted, and the primary and secondary concentration combustion Is possible.
Thus, the combustion method can be changed by changing the gas supply method, such as multistage combustion, concentration combustion, all primary mixed combustion. The mixed gas ejected from the Laval nozzle is high-speed, and the flame is vertically long and very thin.Therefore, the effect of drawing flue gas per unit flame area is great, and normal multistage combustion, concentration combustion, There is an effect that the NOx reduction effect is large compared to the primary premixed combustion.

  According to the fourth aspect of the invention, the combustion air and the fuel gas are all mixed in the suction portion of the Laval nozzle forming portion, and this premixed gas is highly compressed at the throat portion and injected and burned at a high speed from the diffuser outlet. The combustion gas at the front end of the combustion gas causes the combustion exhaust gas around the burner to be recombusted and recombusted, and the premixed gas can be injected at a higher speed than the burner according to the first aspect of the invention. Since the exhaust gas can be sucked more strongly, the suction circulation region of the combustion exhaust gas can be expanded, and the combustion effect can be enhanced more effectively.

  Next, specific embodiments of the gas burner according to the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view schematically showing a main part of a gas burner according to an embodiment of the present invention. FIG. 2 is a view taken along the line II-II in FIG. 1, FIG. 3 is a perspective view showing a part of the appearance of the burner, and FIG. 4 is an explanatory diagram of variable air ratio of the primary mixture. FIG. 5 shows an explanatory diagram when the air ratio of the primary and secondary mixture is made variable, and FIG. 6 shows an explanatory diagram when the primary and secondary mixture have the same air ratio. ing.

  A gas burner 10 according to this embodiment includes an outer case 11 (corresponding to an outer cylinder in the present invention) having a rectangular cross section provided with a mounting structure (not shown) that can be mounted on a burner mounting portion of a combustion device, and the outer case 11. It comprises a mixing means 20 for mixing the fuel gas and the combustion air provided so as to eject the flame with the axis Q aligned, and a fuel gas supply means 30. In addition, the gas burner 10 of this embodiment demonstrates what was comprised vertically long.

  The outer case 11 is formed in a flat rectangular shape with a vertically long rectangular cross section of the required internal method, and the front surface is opened, and the mixing means 20 and the fuel gas supply means 30 are incorporated on the axis. Yes. Further, an air supply port by a blower is connected to the rear end (the direction opposite to the combustion side) of the outer case 11 although a specific structure is not shown.

  The mixing means 20 is dimensioned to fit within the outer case 11 as described above, and has a Laval nozzle shape (hereinafter referred to as “Laval nozzle forming portion 21”) in the longitudinal direction (axial direction) as shown in FIG. The center line is arranged on the axis Q of the outer case 11 so that the front end protrudes from the front end of the outer case 11.

  The Laval nozzle forming portion 21 is formed in a flat cross-sectional shape that narrows the inlet portion 22 (corresponding to the suction portion of the present invention) toward the intermediate throat portion 23, and the inner wall surface of the outer case 11 is formed at the opening edge 22 a. 12 and the air circulation part 15 (corresponding to the diversion air circulation part of the present invention) is arranged at a required interval. In addition, a secondary combustion gas suction part 25 is formed at the tip of the diffuser 24 and is formed in a required length in the axial direction with a larger area than the opening area. Further, the Laval nozzle forming portion 21 effectively sucks the primary air through the gap between the inlet portion 22 and the outer surface of the box of the fuel gas supply means 30 by supplying the fuel gas from the gas ejection hole 34 of the fuel gas supply means 30. It is arranged with the distance which can be done automatically. The Laval nozzle forming portion 21 is attached to and supported by a support member (not shown) on the outer surface portion so that the posture can be maintained with respect to the outer case 11.

  The secondary combustion gas suction portion 25 formed at the tip of the Laval nozzle forming portion 21 is arranged so as to protrude from the tip of the outer case 11 as described above, and suction of the secondary combustion gas on both sides. A plurality of holes 26 are provided intermittently in the vertical direction at a required interval.

  The fuel gas supply means 30 has a flat box shape with a sharpened tip 33 that can be inserted into the inlet portion 22 of a Laval nozzle forming portion 21 (mixing means) disposed inside the outer case 11. Further, a gas supply pipe 32 (see FIG. 3) connected to the fuel gas supply unit is attached to the rear end portion. A plurality of gas ejection holes 34 are formed on both side surfaces of the tip 33 at a predetermined interval in an air-fuel mixture inflow passage formed by the inner surface of the inlet portion 22 of the Laval nozzle forming portion 21 and the outer surface of the gas supply box 31. It is provided in a crossing direction. The gas supply box 31 is preferably provided so as to be movable in the front-rear direction by a required distance at the mounting portion. Thus, the combustion state can be adjusted by changing the mixing ratio of the primary air and the fuel gas at the inlet portion 22 by moving the gas supply box 31 forward and backward.

  Further, although not shown in the drawing (hereinafter the same), a plurality of rectifying plates are arranged in the gas supply box 31 as necessary, and the ejection of the fuel gas from each gas ejection hole 34 is evenly averaged. It is effective. On the other hand, a plurality of rectifying plates are attached to the outer surface of the gas supply box 31 or the inner surface of the inlet portion 22 of the Laval nozzle forming portion 21 in parallel with the air flow direction, and the sucked air (air mixture) flows to the throat portion 23. It is preferable that the liquid flow evenly. It is desirable to provide a rectifying plate also on the air circulation part 15 side in the outer case 11.

  The gas burner 10 configured as described above is used by being attached to, for example, a small once-through boiler. At this time, city gas is used as the fuel, and is supplied by the fuel gas supply means (gas supply box 31). On the other hand, the air and the fuel gas whose flow rate is controlled to be 1.0 to 1.2 are supplied. It is mixed and supplied to the combustion section.

  As shown in FIG. 1 (FIG. 4), combustion air A (indicated by a white arrow) with respect to the fuel gas G (indicated by a black arrow) supplied from the gas supply box 31 is supplied to the outer case 11. The air is divided into the outer air circulation portion 15 and the inside of the inlet portion 22 by the opening edge 22 a of the inlet portion 22 (suction portion) of the Laval nozzle forming portion 21. The fuel gas G ejected from the gas ejection holes 34 of the gas supply box 31 with respect to the air introduced into the inlet portion 22 of the Laval nozzle forming portion 21 is mixed and promoted by intersecting with the inflowing primary air. 'And flows from the suction portion into the throat portion 23. The premixed gas G ′ compressed at the suction portion (inlet portion 22) is further compressed at the narrow throat portion 23 and is ejected from the outlet of the diffuser 24 at high speed. In the secondary combustion gas suction part 25 connected to the outlet of the diffuser 24 (corresponding to the gas mixture outlet of the present invention), the flow path rapidly expands, so that part of the premixed gas that is ejected forms a recirculation region. However, the mainstream goes straight. The premixed gas G ′ traveling straight is ignited and burned by an ignition means attached to a burner (not shown).

  On the other hand, the air diverted to the air circulation portion 15 outside the Laval nozzle forming portion 21 in the outer case 11 flows in the outer case 11 as it is, and in the suction hole 26 provided in the suction portion 25 for the secondary combustion gas. The premixed gas G ′ to be ejected and sucked by the attracting action accompanying the output are supplied to the combustion section as the secondary combustion gas G ″. At this time, the combustion exhaust gas G ″ around the burner generated in the combustion section is also sucked at the same time. And reburned. By doing so, a secondary combustion gas having a low oxygen concentration can be created and supplied toward the flame (not shown) of the combustion section, so that combustion with a low local high temperature can be realized, and further low NOx Can be achieved.

  In the gas burner 10 of the present embodiment, since the burner is rectangular and has a large longitudinal ratio corresponding to the shape of the combustion chamber (not shown), the flame burned as described above is thin in the width direction. Since the mixture is burnt in a vertically long shape and the mixture is injected at a high speed, the secondary combustion gas G ″ flows toward the main flow of the premixed gas G ′ from which it is injected, thereby suppressing the diffusion of the flame. Therefore, it is possible to make the flame straight, so that the surface of the flame becomes thin and the surface area of the flame becomes large, and it has straightness. Thus, even when the flame flow path is narrow and bent, the flame reaches up and down, and the heat absorption effect on the heat transfer surface can be enhanced.

  In the combustion operation, if the supply of the fuel gas G to the primary air in the mixing means 20 is ejected in the direction intersecting the air flow as the fuel gas supply means as described above, the air A and the fuel Mixing of the gas G can be promoted. Further, by moving the fuel gas supply means (gas supply box 31) back and forth to change the gap t (see FIG. 4) between the distal end portion 33 of the gas supply box 31 and the opening edge 22a of the Laval nozzle forming portion 21, The ratio of the primary air amount flowing to the Laval nozzle forming portion 21 and the secondary air amount flowing through the air circulation portion 15 outside the Laval nozzle forming portion 21 can be changed. In other words, the primary air ratio can be easily adjusted.

  Further, as shown in FIG. 5, in the gas supply box 31 (fuel gas supply means 30), if the gas injection hole 34 'is provided on the upstream side in addition to the gas injection hole 34 at the tip, the air-fuel mixture Can also flow to the secondary side (air circulation part 15). Thus, the air-fuel mixtures G′a and G′b on the primary side and the secondary side can be set to different air ratios. As described above, the air ratio of the air-fuel mixture G′a, G′b between the primary side and the secondary side is determined by moving the gas supply box 31 (fuel gas supply means 30) back and forth in the axial direction. The amount of primary air flowing to the Laval nozzle forming portion 21 and the amount of secondary air flowing through the air circulation portion 15 outside the Laval nozzle forming portion 21 are changed by changing the gap t between the tip portion 33 of 31 and the opening edge 22a of the Laval nozzle forming portion 21. It can be adjusted by changing the ratio. Alternatively, by fixing the fuel gas supply means 30 and changing the area ratio between the upstream gas ejection hole 34 ′ and the downstream gas ejection hole 34 to change the fuel gas ejection amount ratio, the primary side and the secondary side are changed. The air ratio with the side can be adjusted. By doing so, primary and secondary density combustion becomes possible.

  Furthermore, as shown in FIG. 6, if the gas ejection hole 34 ′ of the fuel gas supply means 30 (gas supply box 31) is only upstream of the opening edge 22 a of the Laval nozzle forming portion 21, the air-fuel mixture has the same air ratio. Can flow to the primary side and the secondary side.

  In this embodiment, by changing the fuel gas supply method in this way, the combustion method can be changed to multistage combustion, concentration combustion, and all primary premixed combustion. In any method, the air-fuel mixture ejected from the Laval nozzle forming part is high-speed, and the burning flame is vertically long and its thickness is very thin.Therefore, the effect of drawing combustion exhaust gas per unit flame area is large. There is an advantage that the NOx reduction effect is greater than in the case of concentration combustion and all primary premixed combustion.

  Next, an embodiment of a gas burner that uses a total primary premixed gas of primary air and fuel gas will be described. As schematically shown in FIG. 7, the gas burner 10 </ b> B includes a Laval nozzle forming portion 21, a combustion gas suction portion 25 and a fuel gas supply means 30 that are connected to the tip portion thereof. About the structure of these each part, it is substantially the same as the structure in the said embodiment. Therefore, these parts are denoted by the same reference numerals as those of the above-described embodiment, and detailed description thereof is omitted.

  This gas burner 10B does not include the outer case of the gas burner of the above embodiment, and the laval nozzle forming portion 21 and the combustion gas suction portion 25 connected to the outlet of the diffuser 24 are integrally formed, and the premixed gas ejection direction Is a structure that is formed in a vertically long shape with a required length dimension. The gas supply box 31 constituting the fuel gas supply means 30 sharpens the tip, and the air-fuel mixture circulation portion 15a has a required width dimension between the inner surface of the suction portion 22 and the outer surface of the gas supply box 31. Is formed. Further, the gas ejection hole 34 provided in the gas supply box 31 is provided so as to open across the air flow toward the circulation part 15a on the downstream side of the opening edge 22a of the suction part 22. .

  Since the gas burner 10B configured as described above does not include an outer case, the primary air is sucked into the suction portion 22 of the Laval nozzle forming portion 21 and flows through the circulation portion 15a. The gas is mixed with the fuel gas ejected from the gas ejection hole 34, and becomes a total primary premixed gas and is compressed by the flow portion 15a which is narrowed until reaching the throat portion 23 while being highly compressed by the throat portion 23 and passes through. The pressure is released at 24, and the ink is jetted straight forward from the outlet. In addition, since all primary pre-mixed gas is directly injected from the burner outlet, it is injected at a higher speed than in the case of the above-described embodiment, and the combustion gas suction portion 25 more strongly By being ignited and premixed gas is ignited, it is burned in a narrow and vertically long state while maintaining straightness, and the combustion exhaust effect can be further enhanced by expanding the recirculation region of the combustion exhaust gas around the burner. it can.

  In the above description, the case where the gas burner is used in a vertically long state has been described. However, in accordance with the gist of the present invention, the direction of the burner can be arranged in a direction other than the vertical direction as necessary, and combustion is performed. Depending on the shape of the chamber, the direction of the burner may be set to be horizontally long or inclined.

Sectional drawing which represents typically the principal part of the gas burner which concerns on one Embodiment of this invention. A-A view in FIG. Perspective view showing part of the burner's exterior Illustration of variable air ratio of primary mixture Explanatory drawing when the air ratio of the primary and secondary mixture is variable Explanatory drawing when primary and secondary air-fuel mixture has the same air ratio The schematic diagram showing the gas burner of other embodiment Schematic view (a) and plan view (b) of a gas burner according to the invention of the prior application

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,10B Gas burner 11 External case 15 Air distribution part 20 Mixing means 21 Laval nozzle formation part 22 Inlet part (suction part)
Reference Signs List 23 Throat section 24 Diffuser 25 Secondary combustion gas suction section 26 Secondary combustion gas suction hole 30 Fuel gas supply means 31 Gas supply box 34, 34 'Gas ejection hole Q axis

Claims (4)

  1.   A Laval nozzle forming portion is provided at a coaxial line extending position with the fuel gas supply means in the distal end portion of the outer cylinder, and a shunt air circulation portion is formed between the suction portion opening edge of the Laval nozzle forming portion and the inner surface of the outer cylinder, It has a structure in which a suction part for a secondary combustion gas is provided in front of the diffuser outlet of the Laval nozzle forming part by mixing the air branched in the diverted air circulation part and the combustion exhaust gas, and the mixed gas outlet of the Laval nozzle forming part is injected A gas burner characterized by being elongated in a direction crossing the direction.
  2.   2. The gas burner according to claim 1, wherein the fuel gas supply means is provided in a single stage or multiple stages so that fuel gas ejection holes intersect the air flow.
  3.   The gas burner according to claim 1 or 2, wherein the fuel gas supply means is configured to change the mixture ratio of air and fuel gas by moving back and forth in the axial direction relative to the Laval nozzle forming portion.
  4. In a gas burner comprising a mixing means having a Laval nozzle forming part,
    The mixing means has a fuel gas supply means arranged in the suction portion of the Laval nozzle forming portion so as to coincide with the axial center line thereof, and a gas ejection hole of the fuel gas supply means is arranged between the inner surface of the suction portion and the fuel gas supply means. Opened downstream from the opening edge in the air circulation part formed between the side and the side of the diffuser outlet, the combustion exhaust gas suction part is provided in front of the diffuser outlet. A gas burner characterized in that the gas burner is elongated in a direction intersecting with.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102966953A (en) * 2012-11-08 2013-03-13 佛山市科皓燃烧设备制造有限公司 Burner suitable for ultra-long radiant tube

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5103311B2 (en) * 2008-07-18 2012-12-19 株式会社日本サーモエナー Low NOx combustion apparatus and burner used therefor
JP5330838B2 (en) * 2009-01-19 2013-10-30 新日鉄住金エンジニアリング株式会社 Combustion burner for combustible gas generated from waste gasification
CN102494341A (en) * 2011-12-16 2012-06-13 哈尔滨工业大学 Fire barrel type gas burner
US10107494B2 (en) 2014-04-22 2018-10-23 Universal City Studios Llc System and method for generating flame effect
KR101733611B1 (en) * 2015-10-06 2017-05-25 한국생산기술연구원 Ultra-low NOx burner through internal recirculation of combustion gas and multi-fuel operation

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Publication number Priority date Publication date Assignee Title
US4629413A (en) * 1984-09-10 1986-12-16 Exxon Research & Engineering Co. Low NOx premix burner
US5238396A (en) * 1992-06-18 1993-08-24 The Boc Group, Inc. Fuel-burner method and apparatus
JPH09101007A (en) * 1995-10-04 1997-04-15 Hitachi Zosen Corp Fuel two-stage supplying type low nox burner

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102966953A (en) * 2012-11-08 2013-03-13 佛山市科皓燃烧设备制造有限公司 Burner suitable for ultra-long radiant tube
CN102966953B (en) * 2012-11-08 2015-09-09 佛山市科皓燃烧设备制造有限公司 A kind of burner being applicable to ultra-long radiant tube

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