Burner nozzle, burner, and heating furnace

Abstract

To provide a radiation heating type burner, a burner nozzle, and a heating furnace that have a furnace wall with a high heating performance and are stable.SOLUTION: A burner nozzle 30 for a burner 20 that is installed to a blow-in port 12 formed in a furnace wall 11 of a heating furnace 10 and jets a mixed gas 41 of a fuel gas supplied to the blow-in port 12 and air along the furnace wall 11 includes: a heating passage 37 for heating the mixed gas 41 from the blow-in port 12 with internal heat of the furnace; and a wall-side jetting port 34 for jetting a mixed gas 43 from the heating passage 37 along the furnace wall 11.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a burner nozzle, a burner, and a heating furnace. [Background technology]

[0002] Combustion furnaces are used in heating furnaces such as boilers and cracking furnaces. In combustion furnaces, burners installed on the furnace wall generate high-temperature combustion gases inside the furnace, which heat objects to be heated, such as heat transfer pipes, placed inside the furnace. In a burner for a heating furnace, fuel gas and air are supplied from outside the furnace, and the mixed gas is blown into the furnace through a burner nozzle installed on the furnace wall. The mixed gas is ignited by the high heat inside the furnace, generating high-temperature combustion gas (see Patent Document 1). Burners for heating furnaces include those that heat the furnace walls with high-temperature combustion gas and heat the inside of the furnace with radiant heat from the high-temperature furnace walls (see Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-139657 [Patent Document 2] Japanese Patent Application Publication No. 52-111030 Summary of the Invention [Problem to be solved by the invention]

[0004] As burners for the aforementioned heating furnaces, radiant heating burners and burner nozzles have been developed that heat the surrounding furnace walls with combustion gas and heat the object to be heated with radiant heat from the furnace walls. In a radiant heating burner, an inlet for a mixture of fuel gas and air is formed on the inner surface of the furnace wall, and a flat, cup-shaped burner nozzle is installed to cover this inlet. The burner nozzle has multiple openings on its periphery, each of which sprays the mixed gas all around. The sprayed mixed gas is ignited by the heat inside the furnace, becoming high-temperature combustion gas that flows along the inner surface of the surrounding furnace wall. With such a radiant heating burner, the furnace wall surface is heated by high-temperature combustion gas, and the object to be heated placed in the center of the furnace can be heated by the radiant heat from the furnace wall. At this time, the high-temperature combustion gas flows along the inner surface of the furnace wall and does not flow toward the center of the furnace, preventing damage to the object to be heated due to direct heating of the combustion gas.

[0005] In the above-mentioned radiant heating burner, if the type of fuel gas is different, the ignition or combustion of the mixed gas ejected from the peripheral opening does not proceed smoothly, and the heating temperature of the furnace wall by the combustion gas may not reach a sufficiently high temperature. For example, in a radiant heating burner nozzle that normally uses methane gas as fuel, if ammonia gas is mixed with the fuel, the combustion speed is slower than that of methane gas, and the combustion state of the fuel gas that heats the furnace wall becomes unstable, resulting in the problem that a high temperature cannot be obtained on the furnace wall despite the high calorie fuel.

[0006] The present invention aims to provide a radiation heating burner, a burner nozzle, and a heating furnace that have high and stable furnace wall heating performance. [Means for solving the problem]

[0007] The burner nozzle of the present invention is a burner nozzle that is installed at an inlet formed in the furnace wall of a heating furnace and that sprays a mixed gas of fuel gas and air supplied to the inlet along the furnace wall, and has a heating passage that heats the mixed gas from the inlet using heat inside the furnace, and a wall-side nozzle that sprays the mixed gas from the heating passage along the furnace wall.

[0008] In this invention, the mixed gas supplied to the injection port passes through the heating passage and is ejected from the wall-side injection port along the furnace wall, becoming combustion gas and heating the furnace wall. The heating passage is located inside the furnace and is kept at a high temperature by the heat inside the furnace, allowing the passing mixed gas to be heated to a high temperature. By preheating the mixed gas to a high temperature before ejection, combustion of the ejected mixed gas is promoted, allowing efficient generation of high-temperature combustion gas to heat the furnace wall. This improves the heating performance of the furnace wall and enables stable radiant heating. Furthermore, stable combustion gas can be generated even when different types of fuel gas are used, contributing to preventing damage to the heated object inside the furnace.

[0009] In the burner nozzle of the present invention, it is preferable that the burner nozzle has a pipe member extending from the inlet to the inside of the furnace, and a bottomed tubular cover member covering the furnace inside portion of the pipe member, and that the heating passage has a first heating passage formed inside the pipe member and a second heating passage formed between the pipe member and the cover member.

[0010] In this invention, a heating passage is formed inside the pipe member by covering it with a cover member. The pipe member and cover member can be, for example, a double cylinder arranged coaxially. The mixed gas from the blowing port passes through the first heating passage inside the pipe member, enters the cover member at its tip, turns back, and returns through the second heating passage to the blowing port side, i.e., the furnace wall side. The pipe member and cover member extend toward the furnace interior (the side of the furnace away from the furnace wall), and the first heating passage and the second heating passage are also arranged within the furnace over a predetermined length, allowing the passing mixed gas to be heated by the heat inside the furnace. This allows for efficient preheating of the mixed gas despite the simple structure of covering the pipe member with a cover member.

[0011] In the burner nozzle of the present invention, it is preferable that the end of the cover member on the furnace wall side extends to the furnace wall, and the wall-side nozzle is a through-hole formed in the part of the cover member on the furnace wall side. In this invention, the wall-side jet nozzles can be formed in a portion close to the furnace wall with a simple structure. Furthermore, by selecting the arrangement, distribution, shape, etc. of the wall-side jet nozzles, the state of the combustion gas flowing along the furnace wall can be adjusted.

[0012] In the burner nozzle of the present invention, it is preferable that the end of the cover member on the furnace wall side is arranged with a gap between it and the furnace wall, and the wall-side jet port is formed by the gap. In the present invention, the wall-side jetting port can be formed with a simple structure, and the wall-side jetting port can be formed to be continuous over the entire circumference.

[0013] In the burner nozzle of the present invention, it is preferable that the cover member is supported by the pipe member via a heat transfer member. In this invention, the cover member can be supported on the pipe member by the heat transfer member, simplifying the support structure. Furthermore, the heat inside the furnace applied to the outer cover member can be transmitted to the pipe member by the heat transfer member, improving the heating performance of the mixed gas in the first heating passage located inside the second heating passage. As the heat transfer material, metal materials such as stainless steel, which are highly corrosion-resistant and heat-resistant and are used in ordinary burner nozzles, can be used.

[0014] The burner nozzle of the present invention preferably has an inclined jet outlet located closer to the furnace interior than the wall-side jet outlet, for jetting the mixed gas passing through the heating passage toward the furnace wall. In the present invention, a portion of the mixed gas passing through the second heating passage is ejected from the inclined nozzle toward the furnace wall. The mixed gas ejected from the inclined nozzle becomes combustion gas and is blown toward the furnace wall, heating it. Here, the inclined nozzle is formed closer to the furnace than the wall-side nozzle, and there is a distance between it and the furnace wall. Therefore, the combustion gas from the inclined nozzle becomes hot as it is combusted and is blown toward the furnace wall, thereby accelerating the heating of the furnace wall. Furthermore, the flow of combustion gas from the inclined nozzle can deflect the flow of combustion gas flowing along the furnace wall from the wall-side nozzle toward the furnace wall, thereby improving the heating performance of the furnace wall.

[0015] The burner nozzle of the present invention preferably further comprises a guide member disposed in the heating passage for guiding the mixed gas passing through the heating passage to the inclined nozzle. In the present invention, a portion of the mixed gas passing through the heating passage can be efficiently guided to the inclined nozzle by the guide member, thereby further enhancing the effect of promoting the heating performance of the furnace wall by the combustion gas from the inclined nozzle.

[0016] In the burner nozzle of the present invention, it is preferable that a communication port for communicating the heating passage with the outside of the furnace is provided between the induction member and the wall-side nozzle. In the present invention, a portion of the mixed gas passing through the heating passage is branched off to the inclined nozzle, and high-temperature gas from within the furnace can be introduced through the communication port into the mixed gas that continues through the heating passage toward the wall-side nozzle. This allows the mixed gas toward the wall-side nozzle to be sufficiently ignited and heated to a high temperature. In order to introduce the gas from within the furnace through the communication port, it is preferable to adjust the cross-sectional area or gas flow rate of the passage from the inclined nozzle to the wall-side nozzle.

[0017] The burner of the present invention comprises a burner body that supplies a mixed gas of fuel gas and air to an inlet formed in the furnace wall of a heating furnace, and a burner nozzle that is installed at the inlet and sprays the mixed gas along the furnace wall, the burner nozzle having a heating passage that heats the mixed gas from the inlet with heat inside the furnace, and a wall-side spray outlet that sprays the mixed gas from the heating passage along the furnace wall. In the burner of the present invention, the same effects as those explained in the burner nozzle of the main body can be obtained.

[0018] The heating furnace of the present invention is a heating furnace having a furnace body in which an object to be heated is placed, and a burner installed in the furnace body, wherein the burner has a burner body that supplies a mixed gas of fuel gas and air to an inlet formed in the furnace wall of the furnace body, and a burner nozzle that is installed at the inlet and sprays the mixed gas along the furnace wall, and the burner nozzle has a heating passage that heats the mixed gas from the inlet with heat inside the furnace, and a wall-side spray outlet that sprays the mixed gas from the heating passage along the furnace wall. In the heating furnace of the present invention, the same effects as those explained above for the burner nozzle of the main body can be obtained. [Effects of the Invention]

[0019] According to the present invention, it is possible to provide a radiant heating burner, a burner nozzle, and a heating furnace that have high and stable furnace wall heating performance. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a cross-sectional view showing a first embodiment of the present invention. [Figure 2] FIG. 4 is a cross-sectional view showing a second embodiment of the present invention. [Figure 3] FIG. 10 is a cross-sectional view showing a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] [First embodiment] FIG. 1 shows a first embodiment of the present invention. 1, a heating furnace 10 has a furnace body having a furnace wall 11 and a burner 20 installed on the furnace wall 11. An object to be heated (not shown) is placed inside the furnace body, and the burner 20 heats the surrounding furnace wall 11, and the object to be heated is heated by heat radiated from the furnace wall 11.

[0022] The burner 20 has a burner body 21 installed outside the furnace at an inlet 12 formed in the furnace wall 11 , and a burner nozzle 30 installed at the inlet 12 . The burner body 21 mixes fuel gas and air supplied from the outside, and supplies the resulting mixed gas 41 to the blowing port 12 .

[0023] The burner nozzle 30 heats the mixed gas 41 supplied from the burner body 21 with the heat inside the furnace and then jets it out along the furnace wall 11, generating high-temperature combustion gas 44 to heat the furnace wall 11. To this end, the burner nozzle 30 has a heating passage 37 that heats the mixed gas 41 from the inlet 12 with the heat inside the furnace, and a wall-side jet port 34 that jets the mixed gas 43 from the heating passage 37 along the furnace wall 11. To form these heating passages 37 and wall-side nozzles 34, the burner nozzle 30 is provided with a pipe member 31 and a cover member 32.

[0024] The pipe member 31 is a cylindrical member made of heat-resistant and corrosion-resistant material, for example, stainless steel. The outer portion of the pipe member 31 is inserted into the blowing port 12, and one end is connected to the burner body 21. The inner portion of the pipe member 31 extends a predetermined length from the furnace wall 11 into the furnace interior.

[0025] The cover member 32 is a cylindrical member with a bottom made of heat-resistant and corrosion-resistant material, for example, stainless steel. The bottom (inside the furnace) of the cover member 32 is conical. The end of the cover member 32 on the outside of the furnace extends to the burner body 21 through the blowing port 12. A plate-shaped heat transfer member 33 is installed inside the cover member 32, and the inside of the cover member 32 is divided into the inside and outside of the furnace. The cover member 32 is supported by the pipe member 31 via the heat transfer member 33.

[0026] The heat transfer member 33 is made of heat-resistant and corrosion-resistant material, for example, stainless steel, and its outer periphery is connected to the inside of the open end on the furnace exterior of the cover member 32. A through hole is formed in the center of the heat transfer member 33, and the pipe member 31 is inserted through the through hole, with the inner periphery of the through hole connected to the surface of the pipe member 31. The heat transfer member 33 allows the cover member 32 to be coaxially supported on the outside of the pipe member 31, and the pipe member 31 is covered by the cover member 32. By being connected by the heat transfer member 33, the heat of the cover member 32 (heat inside the furnace applied to the part exposed inside the furnace) can be transmitted to the pipe member 31.

[0027] The wall-side jet ports 34 are through-holes formed in a portion of the cover member 32 that is close to the furnace wall 11 and is located closer to the furnace interior than the heat transfer member 33, and a plurality of these through-holes are arranged in the circumferential direction of the cover member 32. It is preferable that the central axes of the wall-side jet ports 34 are each at an angle close to parallel to the surface of the furnace interior of the furnace wall 11 and extend radially from the cover member 32 as the center.

[0028] In the burner nozzle 30, the space inside the pipe member 31 is made into a first heating passage 35, and the space between the outer surface of the pipe member 31 and the cover member 32, which is the space inside the furnace from the heat transfer member 33, is made into a second heating passage 36, and these first heating passage 35 and second heating passage 36 form a continuous heating passage 37. In the heating passage 37, mixed gas 41 is supplied from the burner body 21 to the first heating passage 35, and the mixed gas 41 flows through the first heating passage 35 toward the inside of the furnace and reaches the inside end of the pipe member 31, then changes direction at the inside end of the cover member 32 and enters the second heating passage 36. The mixed gas 42 sent to the second heating passage 36 flows toward the outside of the furnace and reaches the partition portion formed by the heat transfer member 33, becomes mixed gas 43, and is ejected into the furnace from the wall-side ejection port 34. As a result, combustion gas 44 is formed that flows radially from the wall-side jet nozzles 34 along the surfaces of the furnace walls 11, heating the furnace walls 11 and generating radiant heat into the furnace.

[0029] In this embodiment, the mixed gas 41 supplied from the burner body 21 to the blowing port 12 passes through the heating passage 37 and is ejected from the wall-side ejection port 34 along the furnace wall 11, becoming combustion gas 44 that can heat the furnace wall 11. In this case, the heating passage 37 is arranged inside the furnace and is kept at a high temperature by the heat inside the furnace, so that the passing mixed gases 41, 42 can be heated to a high temperature. By preliminarily raising the temperature before ejection, combustion of the ejected mixed gas 43 is promoted, and high-temperature combustion gas 44 can be efficiently generated to heat the furnace wall 11. This improves the heating performance of the furnace wall 11 and enables stable radiant heating. Furthermore, even when different types of fuel gas are used, stable combustion gas 44 can be generated, which also contributes to preventing damage to the object to be heated inside the furnace.

[0030] In this embodiment, a heating passage 37 can be formed inside the pipe member 31 by covering it with a cover member 32. Mixed gas 41 from the blowing port 12 passes through the first heating passage 35 inside the pipe member 31, enters the inside of the cover member 32 at its tip, turns back, and returns through the second heating passage 36 to the blowing port 12 side, i.e., the furnace wall 11 side. The pipe member 31 and the cover member 32 extend inside the furnace, and the first heating passage 35 and the second heating passage 36 are also arranged within the furnace over a predetermined length, so that the mixed gases 41, 42 passing through can be heated by the heat inside the furnace. As a result, even with a simple structure in which the pipe member 31 is covered with the cover member 32, the mixed gases 41 to 43 can be preheated efficiently.

[0031] In this embodiment, a heat transfer member 33 serving as a partition is installed inside the cover member 32, and through holes are provided in the cover member 32 in front of the heat transfer member 33 to form the wall-side jet ports 34. This makes it possible to form the wall-side jet ports 34 in a portion close to the furnace wall 11 with a simple structure. Furthermore, by selecting the arrangement, distribution, shape, etc. of the wall-side jet ports 34, the state of the combustion gas 44 flowing along the furnace wall 11 can be adjusted.

[0032] In this embodiment, the cover member 32 can be supported on the pipe member 31 by the heat transfer member 33, simplifying the support structure. Furthermore, the heat inside the furnace applied to the outer cover member 32 can be transmitted to the pipe member 31 by the heat transfer member 33, improving the heating performance of the mixed gas 41 in the first heating passage 35 arranged inside the second heating passage 36.

[0033] Second Embodiment FIG. 2 shows a second embodiment of the present invention. 2, a heating furnace 10A has a furnace body having a furnace wall 11 and a burner 20A installed on the furnace wall 11. The burner 20A has a burner body 21 installed on the furnace outer side of an air inlet 12 formed in the furnace wall 11, and a burner nozzle 30A installed on the air inlet 12.

[0034] In this embodiment, the furnace wall 11 and furnace body, the burner body 21, and the injection port 12 are the same as those in the first embodiment described above. Furthermore, the heating furnace 10A and the burner 20A of this embodiment are the same as the heating furnace 10 and the burner 20 of the first embodiment described above, except that the configuration of the burner nozzle 30A is different. Therefore, a description of the configuration that is the same as that of the first embodiment described above will be omitted, and the following description will focus on the burner nozzle 30A that has a different configuration.

[0035] The burner nozzle 30A comprises a pipe member 31, a cover member 32, and a heat transfer member 33. A wall-side nozzle 34 is formed on the furnace inner side of the heat transfer member 33 of the cover member 32, and a heating passage 37 is formed inside the cover member 32 by a first heating passage 35 and a second heating passage 36. Mixed gases 41 and 42 from the burner body 21 are guided to the wall-side nozzle 34 by the heating passage 37, and mixed gas 43 is ejected into the furnace and combusted, generating combustion gas 44 along the furnace wall 11. These configurations are the same as those of the first embodiment described above. In the burner nozzle 30A, the following configuration is added to the configuration similar to that of the first embodiment described above.

[0036] The cover member 32 is formed with an inclined ejection port 51 for ejecting the mixed gas 42 passing through the second heating passage 36 toward the furnace wall 11. The inclined nozzle 51 is a through hole that penetrates a portion of the furnace that is closer to the furnace interior than the wall-side nozzle 34 and closer to the furnace exterior than the furnace interior end of the pipe member 31, and the central axis of the through hole is inclined so that the outside of the cover member 32 faces the furnace wall 11.

[0037] A guide member 52 is formed inside the cover member 32. The guide member 52 is disposed in the second heating passage 36 and guides a portion of the mixed gas 42 passing through the second heating passage 36 to the inclined ejection nozzle 51. The guide member 52 rises from a portion on the inner surface of the cover member 32 that is closer to the furnace exterior than the inclined jet nozzle 51, protrudes into the second heating passage 36, and extends into the furnace interior along the inner opening of the inclined jet nozzle 51. As a result, a portion of the mixed gas 42 passing through the second heating passage 36 is separated by the guide member 52 and guided to the inclined jet nozzle 51. The remaining separated mixed gas 42 passes inside the guide member 52 and flows toward the wall-side jet nozzle 34.

[0038] The cover member 32 has a communication port 53 formed between the guide member 52 and the wall-side jet port 34, which connects the second heating passage 36 to the outside of the furnace. The communication port 53 is a through-hole that penetrates the guide member 52 to a position near the furnace inner side, and is capable of introducing the furnace gas 47 outside the cover member 32 into the second heating passage .

[0039] In this embodiment, the same effects as those of the first embodiment described above can be obtained, and the following effects can also be obtained. In this embodiment, a portion of the mixed gas 42 passing through the second heating passage 36 is ejected from the inclined ejection nozzle 51 toward the furnace wall 11. The mixed gas 45 ejected from the inclined ejection nozzle 51 becomes combustion gas 46 and is blown toward the furnace wall 11, heating the furnace wall 11. Here, since the inclined ejection nozzle 51 is formed closer to the furnace than the wall-side ejection nozzle 34 and there is a distance between it and the furnace wall 11, the combustion gas 46 from the inclined ejection nozzle 51 becomes hot as it is combusted and is blown toward the furnace wall 11, thereby accelerating the heating of the furnace wall 11. Furthermore, the flow of the combustion gas 46 from the inclined ejection nozzle 51 can deflect the flow of the combustion gas 44 flowing from the wall-side ejection nozzle 34 along the furnace wall 11 toward the furnace wall 11, thereby improving the heating performance of the furnace wall 11.

[0040] In this embodiment, the induction member 52 provided on the furnace inside of the inclined nozzle 51 can efficiently induce a portion of the mixed gas 42 passing through the second heating passage 36 to the inclined nozzle 51, thereby further enhancing the effect of promoting the heating performance of the furnace wall 11 by the combustion gas 46 from the inclined nozzle 51.

[0041] In this embodiment, a communication port 53 that connects the second heating passage 36 to the outside of the furnace is provided between the guide member 52 and the wall-side jet nozzle 34. Therefore, after a portion of the mixed gas 42 passing through the second heating passage 36 is branched to the inclined jet nozzle 51, high-temperature in-furnace gas 47 can be introduced through the communication port 53 into the mixed gas 42 that continues through the second heating passage 36 toward the wall-side jet nozzle 34. This allows the mixed gas 42 toward the wall-side jet nozzle 34 to be sufficiently ignited and heated to a high temperature. Note that, in order to introduce the in-furnace gas 47 from the communication port 53, it is preferable to adjust the cross-sectional area or gas flow rate of the passage from the inclined jet nozzle 51 to the wall-side jet nozzle 34 by, for example, adjusting the shape of the guide member 52 described above.

[0042] Third Embodiment A third embodiment of the present invention is shown in FIG. 3, a heating furnace 10B has a furnace body having a furnace wall 11 and a burner 20B installed on the furnace wall 11. The burner 20B has a burner body 21 installed on the furnace outer side of an air inlet 12 formed in the furnace wall 11, and a burner nozzle 30B installed at the air inlet 12.

[0043] In this embodiment, the furnace wall 11 and furnace body, the burner body 21, and the injection port 12 are the same as those in the first embodiment described above. Furthermore, the heating furnace 10B and the burner 20B of this embodiment are the same as the heating furnace 10 and the burner 20 of the first embodiment described above, except that the configuration of the burner nozzle 30B is different. Therefore, a description of the configuration that is the same as that of the first embodiment described above will be omitted, and the following description will focus on the burner nozzle 30B, which has a different configuration.

[0044] In the first embodiment described above, the furnace outer end of the cover member 32 is extended to the burner body 21 through the blowing port 12, and the cover member 32 is supported on the pipe member 31 by a heat transfer member 33 that separates the interior, and a wall-side outlet 34 is formed by a through hole near the furnace inner side.

[0045] In this embodiment, the furnace outer end of the cover member 32B is spaced a sufficient distance from the furnace wall 11. A plate member 38 is fixed to the pipe member 31, disposed along the furnace wall 11 and covering the blowing port 12. A slit is formed around the entire periphery between the plate member 38 and the furnace outer end of the cover member 32B, and this slit forms the wall-side jet port 34B.

[0046] A heat transfer member 33B is installed between the cover member 32B and the pipe member 31 on the inner side near the furnace outer end of the cover member 32B. The heat transfer members 33B are plate-shaped members that are aligned along the central axes of the pipe member 31 and the cover member 32B, and multiple heat transfer members 33B are arranged at equal intervals around the same central axis. The cover member 32B is supported on the pipe member 31 by these multiple heat transfer members 33B. The heat from the cover member 32B can be transferred to the pipe member 31 by these heat transfer members 33B.

[0047] This embodiment provides the same effects as those of the first embodiment. Furthermore, this embodiment allows the slit-shaped wall-side jetting port 34B to be formed with a simple structure, and allows the wall-side jetting port 34B to be continuous around the entire periphery.

[0048] Other Embodiments The present invention is not limited to the above-described embodiment, and includes modifications within the scope of achieving the object of the present invention. For example, in the first or third embodiment, the wall-side jet ports 34 may be arranged uniformly along the furnace outer edge of the cover member 32, and the shape and spacing thereof may be set as appropriate. In the second embodiment, the inclined jet nozzles 51 may be arranged uniformly in the circumferential direction of the cover member 32, and the shape and spacing thereof may be set as appropriate. The inclined jet nozzles 51 may be arranged in two or more rows in the central axial direction of the cover member 32. The inclination angle of the inclined jet nozzles 51 may be set as appropriate, as described above. In the second embodiment, the shape and dimensions of the induction member 52 can also be set appropriately, and it is preferable to adjust them so that the mixed gas 42 passing through the second heating passage 36 is appropriately distributed to the inclined nozzle 51 and the wall-side nozzle 34. In the second embodiment, the arrangement and shape dimensions of the communication port 53 can also be set appropriately, and it is preferable to set them appropriately together with the shape of the induction member 52 so that the flow rate and pressure of the mixed gas 42 passing through the second heating passage 36 downstream of the induction member 52 are appropriate for introducing the furnace gas 47. In the second embodiment, the inclined jet nozzle 51, the guide member 52, and the communication port 53 are added to the configuration of the first embodiment, but any of these may be omitted. Also, the configuration of the third embodiment may be added to the inclined jet nozzle 51, or to the inclined jet nozzle 51 and the guide member 52, or to the communication port 53.

[0049] In each of the above-described embodiments, the furnace wall 11 on which the burners 20, 20A, and 20B are installed is a flat surface. However, a partially spherical recess may be provided in the furnace wall 11, and the burners 20, 20A, and 20B may be installed by providing an air inlet 12 at the center of the recess. In each of the above-described embodiments, the burners 20, 20A, 20B and the burner nozzles 30, 30A, 30B are installed horizontally on the vertical furnace wall 11, but the burners 20, 20A, 20B and the burner nozzles 30, 30A, 30B may also be installed upward on a horizontal furnace wall 11, such as the furnace bottom of the furnace body. In each of the above-described embodiments, the furnace inside shape of the cover member 32 is not limited to a cone shape, but may be a hemispherical shape or a flat shape, etc., as long as it can seal the furnace inside end of the cover member 32 and redirect the mixed gas 41 from the first heating passage 35 inside the pipe member 31 to the second heating passage 36 outside the pipe member 31.

[0050] In each of the above-described embodiments, a heating passage of a predetermined length was formed inside the double cylindrical structure consisting of the pipe member 31 and the cover members 32, 32B, from the furnace wall 11 to the furnace interior, but the heating passage may have another configuration. For example, one end of a U-shaped pipe may be connected to the burner body 21 through the injection port 12, with the middle part of the pipe extending into the furnace, and the other end of the pipe may be brought close to the furnace wall 11 and bent along the furnace wall 11, with the tip opening serving as a wall-side outlet. Furthermore, the middle part of the pipe from the end connected to the burner body 21 to the wall-side outlet near the furnace wall 11 may be formed in a zigzag or spiral shape inside the furnace to increase the path length and thereby improve the heating performance of the mixed gas by the heat inside the furnace. [Industrial Applicability]

[0051] INDUSTRIAL APPLICABILITY The present invention can be used for a radiant heating burner, a burner nozzle and a heating furnace which have high and stable heating performance for furnace walls. [Explanation of symbols]

[0052] 10, 10A, 10B...heating furnace, 11...furnace wall, 12...inlet port, 20, 20A, 20B...burner, 21...burner body, 30, 30A, 30B...burner nozzle, 31...pipe member, 32, 32B...cover member, 33, 33B...heat transfer member, 34, 34B...wall-side outlet port, 35...first heating passage, 36...second heating passage, 37...heating passage, 38...plate member, 41, 42, 43, 45...mixed gas, 44, 46...combustion gas, 47...furnace gas, 51...inclined outlet port, 52...guiding member, 53...communication port.

Claims

1. A burner nozzle is installed in an inlet formed in a furnace wall of a heating furnace and ejects a mixed gas of fuel gas and air supplied to the inlet along the furnace wall, a burner nozzle having a heating passage for heating the mixed gas from the inlet by heat inside the furnace, and a wall-side ejection port for ejecting the mixed gas from the heating passage along the furnace wall;

2. The burner nozzle according to claim 1, a pipe member extending from the blowing port to the inside of the furnace; and a bottomed tubular cover member covering the inside of the furnace of the pipe member, The heating passage includes a first heating passage formed inside the pipe member and a second heating passage formed between the pipe member and the cover member.

3. The burner nozzle according to claim 2, The end of the cover member on the furnace wall side extends to the furnace wall, The wall-side nozzle is a burner nozzle that is a through-hole formed in the furnace wall side portion of the cover member.

4. The burner nozzle according to claim 2, The end of the cover member on the furnace wall side is disposed with a gap between it and the furnace wall, The wall-side nozzle is a burner nozzle formed by the gap.

5. The burner nozzle according to claim 2, The burner nozzle has a cover member supported by the pipe member via a heat transfer member.

6. The burner nozzle according to any one of claims 1 to 5, a burner nozzle having an inclined outlet on the furnace inner side than the wall-side outlet for injecting the mixed gas passing through the heating passage toward the furnace wall;

7. In the burner nozzle of the present invention as set forth in claim 6, a burner nozzle having a guide member disposed in the heating passage and guiding the mixed gas passing through the heating passage to the inclined nozzle;

8. The burner nozzle according to claim 7, a burner nozzle having a communication port between the induction member and the wall-side nozzle for connecting the heating passage to the outside of the furnace;

9. a burner body that supplies a mixed gas of fuel gas and air to an inlet formed in a furnace wall of a heating furnace; and a burner nozzle that is installed at the inlet and that sprays the mixed gas along the furnace wall, The burner nozzle is a burner having a heating passage that heats the mixed gas from the inlet using heat inside the furnace, and a wall-side outlet that ejects the mixed gas from the heating passage along the furnace wall.

10. A heating furnace having a furnace body in which an object to be heated is placed and a burner installed in the furnace body, The burner includes a burner body that supplies a mixed gas of fuel gas and air to an inlet formed in a furnace wall of the furnace body, and a burner nozzle that is installed at the inlet and sprays the mixed gas along the furnace wall, The burner nozzle is a heating furnace having a heating passage that heats the mixed gas from the inlet using heat inside the furnace, and a wall-side outlet that ejects the mixed gas from the heating passage along the furnace wall.

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