JP5943205B2 - Gaseous fuel burner - Google Patents

Description

  The present invention relates to a gaseous fuel burner used as a burner for an industrial furnace.

  For example, as a burner for an industrial furnace such as a glass melting furnace, a gaseous fuel burner that uses a gaseous fuel such as natural gas and oxygen gas for combustion support or a mixed gas (such as air) containing oxygen gas is used. ing. As a typical structure of such a burner, the one disclosed in Patent Document 1 is known.

  That is, in this document, a double nozzle structure is formed by a fuel nozzle that injects gaseous fuel and oxygen gas for combustion support, and an oxygen nozzle disposed on the outer peripheral side of the fuel nozzle. A structure is disclosed in which both nozzles have flat (in the same document, substantially rectangular) injection ports along a width direction perpendicular to the direction along the flow path.

  According to such a structure, the frame sprayed from the burner spreads in a fan-like manner in the width direction, and the area that can be heated by radiant heat transfer is increased by the amount of spread of the frame. Therefore, for example, when this burner is used in a glass melting furnace, it is possible to suitably melt the glass.

Japanese Patent No. 3591058

  By the way, when this type of burner is used in an industrial furnace, as shown in FIG. 7, the frame F is placed in the furnace with the burner 100 installed on a furnace wall 110 formed of a refractory 120 such as a brick. A method of spraying is adopted. Further, the frame F ejected from the burner 100 is flat and easily fluctuated. For example, when the airflow is disturbed around the ejected frame F, the frame F easily rises, and has a property of poor straightness. doing.

  For this reason, the fired frame 120 may burn the refractory 120 on the way to the furnace, and the refractory 120 and, consequently, the furnace wall 110 may be melted and damaged. When such a situation occurs, it is necessary to replace the damaged refractory 120 with a new one. For example, in a glass melting furnace, the temperature in the furnace is heated to a high temperature of about 1600 ° C. Therefore, the current situation is that the replacement work is difficult.

  This invention made | formed in view of said situation makes it a technical subject to suppress the damage of the furnace wall in an industrial furnace by improving a gaseous fuel burner.

  The present invention, which has been created to solve the above problems, injects a fuel nozzle for injecting gaseous fuel, oxygen gas for supporting combustion, or a mixed gas containing oxygen gas, and on the outer peripheral side of the fuel nozzle. In the gas fuel burner which forms a double pipe structure with the disposed combustion supporting gas nozzles, and each of the nozzles has a flat injection port at the tip portion along the width direction perpendicular to the direction along the flow path. The fuel nozzle is characterized in that the tip of the fuel nozzle is formed such that the center in the width direction is recessed from both ends.

  According to such a configuration, the injection port formed at the tip of the fuel nozzle is not a flat opening but an opening in which the central portion in the width direction is recessed from both ends. The part where the central part in the width direction of the mouth is opened toward the front end side is present at a position that is depressed more than the part where both end parts in the width direction are opened toward the front end side. Therefore, it is possible to form a frame that is superior in straight running performance and less likely to fluctuate as compared with a conventional gas fuel burner in which the injection port is a flat opening. As a result, it is possible to prevent as much as possible the occurrence of a situation in which this frame burns the refractory that constitutes the furnace wall on the way to the inside of the furnace. It becomes possible to suppress damage. In addition, although it can be set as the aspect which injects oxygen gas or mixed gas (air etc.) containing oxygen gas from a combustion support gas nozzle, when oxygen gas is injected among these, it becomes more straight ahead It is possible to form a frame that is excellent and hardly fluctuates.

  Said structure WHEREIN: It is preferable that the front-end | tip part of the said fuel nozzle has a symmetrical shape on the basis of the center part in the said width direction.

  In this way, a symmetric frame can be formed with reference to the central portion in the width direction, and uniform heating in the width direction is possible.

  Said structure WHEREIN: The front-end | tip part of the said fuel nozzle may be formed in circular arc shape.

  Even in this case, it is possible to inject a flame that is less likely to fluctuate and has excellent straightness as compared with a conventional gaseous fuel burner.

  Said structure WHEREIN: The front-end | tip part of the said fuel nozzle may be formed in V shape.

  Even in this case, it is possible to inject a flame that is less likely to fluctuate and has excellent straightness as compared with a conventional gaseous fuel burner.

  As described above, according to the present invention, it is possible to inject a frame that is less likely to fluctuate and has excellent straightness, and the refractory that constitutes the furnace wall is burned compared to the conventional one. Can be prevented as much as possible, so that damage to the furnace wall in an industrial furnace can be suppressed.

It is a top view which shows the gaseous fuel burner which concerns on 1st embodiment of this invention. It is a front view which shows the gaseous fuel burner which concerns on 1st embodiment of this invention. It is a side view which shows the gaseous fuel burner which concerns on 1st embodiment of this invention. It is a top view which shows the gaseous fuel burner which concerns on 2nd embodiment of this invention. It is a front view which shows the gaseous fuel burner which concerns on 2nd embodiment of this invention. It is a top view which shows the gaseous fuel burner which concerns on other embodiment of this invention. It is a side view which shows the conventional gaseous fuel burner.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 and 2 are a plan view and a front view, respectively, showing a gaseous fuel burner 1 according to the first embodiment of the present invention. As shown in these drawings, a gaseous fuel burner 1 injects a fuel nozzle 3 for injecting gaseous fuel 2 (for example, natural gas) and an oxygen gas 4 for supporting combustion, and on the outer peripheral side of the fuel nozzle 3. And an oxygen nozzle 5 as a combustion supporting gas nozzle.

  The fuel nozzle 3 has a rectangular cross-sectional shape, and the long side dimension A of the rectangular shape is four times or more the short side dimension. Moreover, the fuel nozzle 3 has a flat injection port along the width direction (left-right direction in FIG. 1) orthogonal to the direction (up-down direction in FIG. 1) along the flow path which is the longitudinal direction. The injection port is formed in a rectangular shape when viewed from the front, and the gas fuel 2 is injected as the tip (opening) 3a forming the injection port moves from the side to the center in the width direction. It is depressed on the original side and has an arc shape. Furthermore, the tip portion 3a has a symmetrical shape with respect to the central portion in the width direction, and the dimension B in the longitudinal direction is 5 to 10% of the long side dimension A described above. Is done. In addition, the recessed part in the front-end | tip part 3a is opposingly formed in two places (upper and lower sides of the opening part in FIG. 2), and these shapes and dimensions are mutually the same.

  The oxygen nozzle 5 is arranged substantially concentrically on the outer peripheral side of the fuel nozzle 3 so that the fuel nozzle 3 and the oxygen nozzle 5 form a double pipe structure, and the oxygen gas 4 is circulated by both the nozzles 3 and 5. A gap S is formed. Further, the injection port of the oxygen nozzle 5 is formed in a rectangular shape when viewed from the front, similarly to the fuel nozzle 3. Furthermore, the shape of the cross section of the oxygen nozzle 5 is also formed in a rectangular shape.

  Hereinafter, the operation of the gaseous fuel burner 1 according to the first embodiment will be described.

  According to this gaseous fuel burner 1, as shown in FIG. 3, the tip 3 a forming the injection port of the fuel nozzle 3 is flat in the width direction, as shown in FIG. When installed on the furnace wall, it is possible to inject the frame F that is less likely to fluctuate and has excellent straightness. As a result, it is possible to prevent as much as possible the occurrence of such a situation that this frame F burns the refractory 120 that constitutes the furnace wall 110 on the way to the inside of the furnace. It becomes possible to suppress damage to the furnace wall 110 (refractory 120).

  For this reason, even if it becomes necessary to replace the damaged refractory 120 with a new one, it is possible to suppress the replacement frequency as much as possible. In addition, since the symmetric frame F can be formed with reference to the central portion in the width direction, uniform heating in the width direction is possible. In addition, the dimension W (maximum width) in the width direction of the flame | frame F injected from this gaseous fuel burner 1 becomes small compared with the conventional gaseous fuel burner. Furthermore, the dimension H (thickness at the center) of the frame F in the thickness direction is larger than that of a conventional gaseous fuel burner.

  4 and 5 are a plan view and a front view, respectively, showing the gaseous fuel burner 1 according to the second embodiment of the present invention. Here, in the description of the gaseous fuel burner according to the second embodiment described below, the components having the same function or shape as those of the gaseous fuel burner according to the first embodiment are described in the second embodiment. The same reference numerals are attached to the drawings for explaining the above, and duplicate explanations are omitted.

  The gaseous fuel burner 1 according to the second embodiment is different from the gaseous fuel burner according to the first embodiment in that the dimension B in the longitudinal direction of the recessed portion in the tip portion 3a of the fuel nozzle 3 is different. Is the point that has become longer.

  Hereinafter, the operation of the gaseous fuel burner 1 according to the second embodiment will be described.

  According to this gaseous fuel burner 1, it becomes possible to inject the flame | frame F which was hard to fluctuate | deviate compared with the gaseous fuel burner which concerns on said 1st embodiment, and was more excellent in straight ahead. In addition, the dimension W (maximum width) in the width direction of the flame | frame F injected from this gaseous fuel burner 1 becomes small compared with the gaseous fuel burner which concerns on said 1st embodiment. Further, the dimension H (thickness at the center) of the frame F in the thickness direction is larger than that of the gaseous fuel burner according to the first embodiment.

  In this way, by changing the dimension B in the longitudinal direction of the recessed portion, it is possible to adjust the dimension W in the width direction of the frame F and the dimension H in the thickness direction. That is, as the dimension B increases, the dimension W decreases and the dimension H increases. On the other hand, if the dimension B becomes smaller, the dimension W becomes larger and the dimension H becomes smaller.

  Here, the gaseous fuel burner which concerns on this invention is not limited to the structure demonstrated in said each embodiment. For example, in each of the embodiments described above, the tip of the fuel nozzle has an arc shape, but as shown in FIG. 6, the recessed portion of the tip 3a may be V-shaped. In the figure, illustrations other than the fuel nozzle 3 are omitted.

  In each of the above embodiments, the oxygen nozzle is arranged substantially concentrically outside the fuel nozzle, but may be arranged eccentrically. In this case, for example, when the fuel nozzle is decentered downward with respect to the oxygen nozzle, the flow rate of the oxygen gas increases upward and decreases downward. Thereby, the brightness | luminance above the injected flame | frame can be raised.

  Further, in each of the above embodiments, a mixed gas containing oxygen gas may be used instead of oxygen gas. An example of the mixed gas containing oxygen gas is air.

DESCRIPTION OF SYMBOLS 1 Gaseous fuel burner 2 Gaseous fuel 3 Fuel nozzle 3a Tip part of fuel nozzle 4 Oxygen 5 Oxygen nozzle S Gap

Claims (4)

A fuel nozzle for injecting gaseous fuel;
Injecting oxygen gas for supporting combustion, or mixed gas containing oxygen gas, and forming a double tube structure with the supporting gas nozzle arranged on the outer peripheral side of the fuel nozzle,
In the gaseous fuel burner in which both the nozzles each have a flat injection port along the width direction perpendicular to the direction along the flow path, respectively.
A gas fuel burner characterized in that a tip portion of the fuel nozzle is formed such that a central portion in the width direction is recessed from both end portions.   2. The gaseous fuel burner according to claim 1, wherein a tip portion of the fuel nozzle has a symmetrical shape with respect to a central portion in the width direction.   The gaseous fuel burner according to claim 2, wherein a tip portion of the fuel nozzle is formed in an arc shape.   The gas fuel burner according to claim 2, wherein the tip of the fuel nozzle is formed in a V shape.

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