Gas burner and operating method for gas burner

Abstract

To prevent a burner part that does not supply fuel gas from being deformed or burned when supplying the fuel gas from a part of at least three burner parts disposed at different vertical positions.SOLUTION: A gas burner includes a first burner part 10, a second burner part 20, a third burner part 30, a fuel gas adjustment section, an air adjustment section, and a control section that controls the fuel gas adjustment section and the air adjustment section. In a vertical direction VD, the first burner part 10 is disposed above the second burner part 20, and the third burner part 30 is disposed below the second burner part 20. At least two second fuel gas supply ports 21 communicate within the second burner part 20. The control section executes a first control mode of controlling the fuel gas adjustment section and the air adjustment section so as to supply fuel gas G and combustion air to the first burner part 10 and the third burner part 30 and so as not to supply the fuel gas G to the second burner part 20.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] FIELD OF THE DISCLOSURE The present disclosure relates to gas burners and methods of operating gas burners. [Background technology]

[0002] Conventionally, there is known a riffle-type gas burner that promotes the mixing of gas and air to improve the combustibility of low-calorie gases, etc. (see, for example, Patent Document 1). In the gas burner disclosed in Patent Document 1, some of the multiple tip segments are used as gas outlets, and the rest are used as air outlets. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 62-136725 Summary of the Invention [Problem to be solved by the invention]

[0004] In order to make the output of the gas burner variable, a configuration can be adopted in which multiple burner sections each having a similar structure are arranged at different positions in the vertical direction, and the burner section that burns the fuel gas can be selectively switched depending on the required output. In this configuration, fuel gas is supplied to the combustion furnace from some of the multiple burner sections, but fuel gas is not supplied to the combustion furnace from other parts of the multiple burner sections.

[0005] If fuel gas is supplied from a burner unit located vertically above or below the specified burner unit in a state where fuel gas is not supplied from the specified burner unit, high-temperature combustion gas generated by combustion of the fuel gas may flow into the inside of the specified burner unit. If high-temperature combustion gas flows into the inside of the specified burner unit, the specified burner unit may be deformed or burned out by heat.

[0006] The present disclosure has been made in consideration of the above circumstances, and aims to provide a gas burner and an operating method for a gas burner that are capable of preventing deformation or burning of burner sections that do not supply fuel gas when fuel gas is supplied from a portion of at least three burner sections arranged at different vertical positions. [Means for solving the problem]

[0007] In order to solve the above problems, the present disclosure employs the following solutions. The gas burner according to the present disclosure includes a first burner section (10) into which a fuel gas (G) and combustion air (A) are introduced and which has a plurality of first fuel gas supply ports (11) for supplying the fuel gas to a combustion furnace (200) and a plurality of first air supply ports (12) for supplying the combustion air to the combustion furnace, a second burner section (20) into which the fuel gas and the combustion air are introduced and which has a plurality of second fuel gas supply ports (21) for supplying the fuel gas to the combustion furnace and a plurality of second air supply ports (22) for supplying the combustion air to the combustion furnace, a third burner section (30) into which the fuel gas and the combustion air are introduced and which has a plurality of third fuel gas supply ports (31) for supplying the fuel gas to the combustion furnace and a plurality of third air supply ports (32) for supplying the combustion air to the combustion furnace, and a first burner section (10) having a plurality of first fuel gas supply ports (11) for supplying the fuel gas to a combustion furnace (200) and a plurality of first air supply ports (12) for supplying the combustion air to the combustion furnace, and a second burner section (20) having a plurality of second fuel gas supply ports (21) for supplying the fuel gas to the combustion furnace and a plurality of second air supply ports (22) for supplying the combustion air to the combustion furnace, and a third burner section (30) having a plurality of third fuel gas supply ports (31) for supplying the fuel gas to the combustion furnace and a plurality of third air supply ports (32) for supplying the combustion air to the combustion furnace. the first burner section, the second burner section, and the third burner section, a fuel gas adjustment section (40) that adjusts the supply amount of the fuel gas supplied to the first burner section, the second burner section, and the third burner section, an air adjustment section (50) that adjusts the supply amount of the combustion air supplied to the first burner section, the second burner section, and the third burner section, and a control section (60) that controls the fuel gas adjustment section and the air adjustment section, the first burner section is disposed above the second burner section and the third burner section is disposed below the second burner section in the vertical direction, at least two of the second fuel gas supply ports are connected inside the second burner section, and the control section executes a first control mode in which the fuel gas and the combustion air are supplied to the first burner section and the third burner section, and the control section controls the fuel gas adjustment section and the air adjustment section so as not to supply the fuel gas to the second burner section.

[0008] In the method of operating a gas burner according to the present disclosure, the gas burner comprises a first burner section into which a fuel gas and combustion air are introduced and which has a plurality of first fuel gas supply ports for supplying the fuel gas to a combustion furnace and a plurality of first air supply ports for supplying the combustion air to the combustion furnace, a second burner section into which the fuel gas and the combustion air are introduced and which has a plurality of second fuel gas supply ports for supplying the fuel gas to the combustion furnace and a plurality of second air supply ports for supplying the combustion air to the combustion furnace, and a third burner section into which the fuel gas and the combustion air are introduced and which has a plurality of third fuel gas supply ports for supplying the fuel gas to the combustion furnace and a plurality of third air supply ports for supplying the combustion air to the combustion furnace. the first burner section is disposed above the second burner section and the third burner section is disposed below the second burner section, at least two of the second fuel gas supply ports are connected inside the second burner section, and a first operating step is provided for operating the fuel gas adjusting section and the air adjusting section so as to supply the fuel gas and the combustion air to the first burner section and the third burner section and not to supply the fuel gas to the second burner section. Effect of the Invention

[0009] According to the present disclosure, it is possible to provide a gas burner and an operating method for a gas burner that are capable of preventing deformation or burning of burner sections that do not supply fuel gas when fuel gas is supplied from a portion of at least three burner sections arranged at different vertical positions. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a front view showing a gas burner according to an embodiment of the present disclosure. [Diagram 2]1 is a schematic configuration diagram of a gas burner according to an embodiment of the present disclosure. FIG. [Diagram 3] 2 is a cross-sectional view taken along the line AA of the gas burner shown in FIG. 1. [Figure 4] 2 is a cross-sectional view taken along the line BB of the gas burner shown in FIG. 1. [Diagram 5] 2 is a plan view of a first burner portion of the gas burner shown in FIG. 1, as viewed from above. [Figure 6] FIG. 2 is a cross-sectional view of the gas burner shown in FIG. 1 taken along the line AA, illustrating a state in which the gas burner is performing a partial load mode. [Figure 7] FIG. 2 is a cross-sectional view of the gas burner shown in FIG. 1 taken along the line BB, illustrating a state in which the gas burner is executing a partial load mode. [Figure 8] 2 is a cross-sectional view taken along the line AA of the gas burner shown in FIG. 1, illustrating a state in which the gas burner executes a comparative example in partial load mode. [Figure 9] FIG. 2 is a cross-sectional view taken along the line BB of the gas burner shown in FIG. 1, illustrating a state in which the gas burner executes a comparative example in a partial load mode. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] A gas burner 100 according to an embodiment of the present disclosure will be described below with reference to the drawings. A front view showing a gas burner 100 according to an embodiment of the present disclosure. As shown in Fig. 1, the gas burner 100 includes a first burner section 10, a second burner section 20, and a third burner section 30, which are arranged at the same position in the horizontal direction HD along the vertical direction VD. In the vertical direction VD, the first burner section 10 is arranged above the second burner section 20, and the third burner section 30 is arranged below the second burner section 20.

[0012] As shown in Fig. 1, the first burner section 10 has a plurality of first fuel gas supply ports 11, a plurality of first air supply ports 12, and an igniter 15. The first fuel gas supply port 11 is a flow path that supplies fuel gas G to a combustion furnace 200 (see Fig. 3). The first air supply port 12 is a flow path that supplies combustion air A to the combustion furnace 200. The igniter 15 is a device that generates an ignition source that ignites the fuel gas G.

[0013] An opening 10a of the first burner section 10 that opens to the combustion furnace 200 is divided into 22 sections (excluding the section of the igniter 15) by partition plates 10b extending along the horizontal direction HD and 10c extending along the vertical direction VD. In both the horizontal direction HD and the vertical direction VD, first fuel gas supply ports 11 and first air supply ports 12 are arranged alternately. Fuel gas G and combustion air A are introduced into the first burner section 10. In other words, the first fuel gas supply ports 11 and first air supply ports 12 are each arranged in a staggered pattern.

[0014] The second burner section 20 has a plurality of second fuel gas supply ports 21, a plurality of second air supply ports 22, and an igniter 25. The second fuel gas supply port 21 is a flow path that supplies the fuel gas G to the combustion furnace 200. The second air supply port 22 is a flow path that supplies the combustion air A to the combustion furnace 200. The igniter 25 is a device that generates an ignition source that ignites the fuel gas G.

[0015] An opening 20a of the second burner section 20 opening to the combustion furnace 200 is divided into 22 sections (excluding the section of the igniter 25) by partition plates 20b extending along the horizontal direction HD and 20c extending along the vertical direction VD. Second fuel gas supply ports 21 and second air supply ports 22 are alternately arranged in both the horizontal direction HD and the vertical direction VD. Fuel gas G and combustion air A are introduced into the second burner section 20.

[0016] The third burner section 30 has a plurality of third fuel gas supply ports 31, a plurality of third air supply ports 32, and an igniter 35. The third fuel gas supply port 31 is a flow path for supplying the fuel gas G to the combustion furnace 200. The third air supply port 32 is a flow path for supplying the combustion air A to the combustion furnace 200. The igniter 35 is a device that generates an ignition source for igniting the fuel gas G.

[0017] An opening 30a of the third burner section 30 opening to the combustion furnace 200 is divided into 22 sections (excluding the section of the igniter 35) by partition plates 30b extending along the horizontal direction HD and 30c extending along the vertical direction VD. In both the horizontal direction HD and the vertical direction VD, third fuel gas supply ports 31 and third air supply ports 32 are alternately arranged. Fuel gas G and combustion air A are introduced into the third burner section 30.

[0018] Fig. 2 is a schematic diagram of a gas burner according to an embodiment of the present disclosure. As shown in Fig. 2, the gas burner 100 includes a fuel gas adjusting section 40, an air adjusting section 50, and a control section 60. The fuel gas adjusting section 40 is a device that adjusts the supply amount of fuel gas G supplied to the first burner section 10, the second burner section 20, and the third burner section 30. The air adjusting section 50 is a device that adjusts the supply amount of combustion air A supplied to the first burner section 10, the second burner section 20, and the third burner section 30. The control section 60 is a device that controls the fuel gas adjusting section 40 and the air adjusting section 50.

[0019] The fuel gas adjusting section 40 has a first fuel gas regulating valve 41 that adjusts the amount of fuel gas G supplied to the first burner section 10, a second fuel gas regulating valve 42 that adjusts the amount of fuel gas G supplied to the second burner section 20, and a third fuel gas regulating valve 43 that adjusts the amount of fuel gas G supplied to the third burner section 30. The first fuel gas regulating valve 41 is disposed in a first fuel gas supply passage 41a, the second fuel gas regulating valve 42 is disposed in a second fuel gas supply passage 42a, and the third fuel gas regulating valve 43 is disposed in a third fuel gas supply passage 43a. The opening degree of the first fuel gas regulating valve 41, the opening degree of the second fuel gas regulating valve 42, and the opening degree of the third fuel gas regulating valve 43 are controlled by the control section 60.

[0020] The air adjusting section 50 has a first air regulating valve 51 which adjusts the amount of combustion air A supplied to the first burner section 10, a second air regulating valve 52 which adjusts the amount of combustion air A supplied to the second burner section 20, and a third air regulating valve 53 which adjusts the amount of combustion air A supplied to the third burner section 30. The opening degrees of the first air regulating valve 51, the second air regulating valve 52, and the third air regulating valve 53 are controlled by a control section 60.

[0021] Fig. 3 is a cross-sectional view of the gas burner 100 shown in Fig. 1 taken along the line AA. As shown in Fig. 3, in the first burner section 10, two first fuel gas supply ports 11 are adjacent to each other in the horizontal direction HD and in the vertical direction VD, and the two first fuel gas supply ports 11 adjacent to each other in a staggered manner in the horizontal direction HD and the vertical direction VD are connected to an end of the first fuel gas flow path 13 on the combustion furnace 200 side. The first fuel gas flow path 13 is connected to a first fuel gas supply passage 41a that supplies fuel gas to the first burner section 10. The two adjacent first fuel gas supply ports 11 communicate with each other through the first fuel gas flow path 13 inside the first burner section 10.

[0022] In the second burner section 20, two second fuel gas supply ports 21 adjacent to each other in the horizontal direction HD and adjacent to each other in the vertical direction VD, and adjacent to each other in a staggered manner in the horizontal direction HD and the vertical direction VD, are connected to an end of the second fuel gas flow path 23 on the combustion furnace 200 side. The second fuel gas flow path 23 is connected to a second fuel gas supply passage 42a that supplies fuel gas to the second burner section 20. The two adjacent second fuel gas supply ports 21 communicate with each other via the second fuel gas flow path 23 inside the second burner section 20.

[0023] In the third burner section 30, two third fuel gas supply ports 31 adjacent to each other in the horizontal direction HD and adjacent to each other in the vertical direction VD, and the two third fuel gas supply ports 31 adjacent to each other in a staggered manner in the horizontal direction HD and the vertical direction VD, are connected to an end of the third fuel gas flow path 33 on the combustion furnace 200 side. The third fuel gas flow path 33 is connected to a third fuel gas supply passage 43a that supplies fuel gas to the third burner section 30. The two adjacent third fuel gas supply ports 31 communicate with each other via the third fuel gas flow path 33 inside the third burner section 30.

[0024] Fig. 4 is a cross-sectional view of the gas burner 100 shown in Fig. 1 taken along the line BB. As shown in Fig. 4, in the first burner section 10, two first air supply ports 12 are adjacent to each other in the horizontal direction HD and in the vertical direction VD, and the two first air supply ports 12 adjacent to each other in a staggered manner in the horizontal direction HD and the vertical direction VD communicate with the end of the first air flow path 14 on the combustion furnace 200 side. The first air flow path 14 is connected to a first air supply passage 51a that supplies combustion air A to the first burner section 10. The two adjacent first air supply ports 12 communicate with each other through the first air flow path 14 inside the first burner section 10.

[0025] The second burner section 20 has two second air supply ports 22 adjacent to each other in the horizontal direction HD and adjacent to each other in the vertical direction VD. The two second air supply ports 22 adjacent to each other in a staggered manner in the horizontal direction HD and the vertical direction VD communicate with the end of the second air flow path 24 on the combustion furnace 200 side. The second air flow path 24 is connected to a second air supply passage 52a that supplies combustion air A to the second burner section 20. The two adjacent second air supply ports 22 communicate with each other via the second air flow path 24 inside the second burner section 20.

[0026] The third burner section 30 has two third air supply ports 32 adjacent to each other in the horizontal direction HD and adjacent to each other in the vertical direction VD. The two third air supply ports 32 adjacent to each other in a staggered manner in the horizontal direction HD and the vertical direction VD communicate with the end of the third air flow path 34 on the combustion furnace 200 side. The third air flow path 34 is connected to a third air supply passage 53a that supplies combustion air A to the third burner section 30. The two adjacent third air supply ports 32 communicate with each other via the third air flow path 34 inside the third burner section 30.

[0027] Fig. 5 is a plan view of the first burner section 10 of the gas burner shown in Fig. 1, seen from above. As shown in Fig. 5, the fuel gas G flowing from the first fuel gas supply passage 41a into the first fuel gas flow passage 13 is supplied to the combustion furnace 200 via the first fuel gas supply port 11. The combustion air A flowing from the first air supply passage 51a into the first air flow passage 14 is supplied to the combustion furnace 200 via the first air supply port 12. In the second burner section 20 and the third burner section 30, the fuel gas G and the combustion air A are also supplied to the combustion furnace 200 by a similar structure.

[0028] Next, a description will be given of an operation method of the gas burner 100 executed by the control unit 60. The control unit 60 executes any one of the following operation modes as an operation mode in which the fuel gas G is supplied from at least one of the first burner unit 10, the second burner unit 20, and the third burner unit 30 to the combustion furnace 200 and combusted.

[0029] The control unit 60 executes a full load mode in which fuel gas G is supplied to the combustion furnace 200 from all of the first burner unit 10, the second burner unit 20, and the third burner unit 30. In the full load mode, the control unit 60 opens all of the first fuel gas regulating valve 41, the second fuel gas regulating valve 42, and the third fuel gas regulating valve 43, and opens all of the first air regulating valve 51, the second air regulating valve 52, and the third air regulating valve 53.

[0030] The control unit 60 executes a partial load mode (first control mode; first operation step) in which the fuel gas G is supplied to the combustion furnace 200 from the first burner unit 10 and the third burner unit 30, and the fuel gas G is not supplied to the combustion furnace 200 from the second burner unit 20. In the partial load mode, the control unit 60 opens the first fuel gas regulating valve 41 and the third fuel gas regulating valve 43, closes the second fuel gas regulating valve 42, opens the first air regulating valve 51 and the third air regulating valve 53, and closes the second air regulating valve 52. Note that the second air regulating valve 52 may be slightly opened rather than completely closed to suppress the intrusion of the combustion gas from the combustion furnace 200 into the second burner unit 20.

[0031] The control unit 60 executes a minimum load mode in which the fuel gas G is supplied to the combustion furnace 200 from the first burner unit 10, and the fuel gas G is not supplied to the combustion furnace 200 from the second burner unit 20 and the third burner unit 30. In the minimum load mode, the control unit 60 opens the first fuel gas regulating valve 41, closes the second fuel gas regulating valve 42 and the third fuel gas regulating valve 43, opens the first air regulating valve 51, and closes the second air regulating valve 52 and the third air regulating valve 53. The second air regulating valve 52 and the third air regulating valve 53 may be slightly opened rather than completely closed to suppress the intrusion of the combustion gas from the combustion furnace 200 into the second burner unit 20 and the third burner unit 30.

[0032] The control unit 60 executes a stop mode in which fuel gas G is not supplied to the combustion furnace 200 from any of the first burner unit 10, the second burner unit 20, and the third burner unit 30. In the stop mode, the control unit 60 closes all of the first fuel gas regulating valve 41, the second fuel gas regulating valve 42, and the third fuel gas regulating valve 43, and closes all of the first air regulating valve 51, the second air regulating valve 52, and the third air regulating valve 53.

[0033] Next, the flow of the fuel gas G and the combustion air A when the control unit 60 executes the partial load mode will be described with reference to Fig. 6 and Fig. 7. Fig. 6 is a cross-sectional view of the gas burner 100 shown in Fig. 1 taken along line AA, showing the state in which the gas burner 100 executes the partial load mode. Fig. 7 is a cross-sectional view of the gas burner 100 shown in Fig. 1 taken along line BB, showing the state in which the gas burner 100 executes the partial load mode.

[0034] 6, in the partial load mode, the fuel gas G flows from the first fuel gas supply passage 41a into the first fuel gas flow passage 13, the fuel gas G branches from the first fuel gas flow passage 13 and flows into a pair of (upper and lower) first fuel gas supply ports 11, and the fuel gas G is supplied from the first fuel gas supply port 11 to the combustion furnace 200. In addition, the fuel gas G flows from the third fuel gas supply passage 43a into the third fuel gas flow passage 33, the fuel gas G branches from the third fuel gas flow passage 33 and flows into a pair of (upper and lower) third fuel gas supply ports 31, and the fuel gas G is supplied from the third fuel gas supply port 31 to the combustion furnace 200.

[0035] On the other hand, in the partial load mode, the fuel gas G does not flow from the second fuel gas supply passage 42a to the second fuel gas flow passage 23. In the partial load mode, the fuel gas G is supplied to the combustion furnace 200 from the first fuel gas supply port 11 and the third fuel gas supply port 31 and combusted. Therefore, a force that causes gas (e.g., remaining fuel gas G) inside the second burner section 20 to flow out toward the combustion furnace 200 acts on the ends of both the second fuel gas supply port 21 above the vertical direction VD of the second burner section 20 and the second fuel gas supply port 21 below the vertical direction VD on the combustion furnace 200 side.

[0036] 6, the fuel gas G remaining in the second fuel gas supply port 21 and the second fuel gas flow path 23 of the second burner section 20 is guided from inside the second burner section 20 toward the combustion furnace 200. Since a force that causes the fuel gas G remaining inside the second burner section 20 to flow out is generated in both the second fuel gas supply port 21 above the vertical direction VD of the second burner section 20 and the second fuel gas supply port 21 below the vertical direction VD of the second burner section 20, high-temperature combustion gas is prevented from being guided from the combustion furnace 200 to inside the second burner section 20 (combustion gas is prevented from flowing into the second burner section 20).

[0037] It is possible to prevent the combustion gas C from being drawn into the burner by supplying a seal gas such as an inert gas from inside the unlit burner through the fuel gas flow path toward the combustion furnace 200, but this requires a large amount of seal gas, which may increase costs and adversely affect combustion. Therefore, in this embodiment, when executing the partial load mode, the control unit 60 controls the operation of the lit and unlit burners as described above without supplying seal gas to the unlit burner, so as not to draw the combustion gas C into the burner.

[0038] 7, in the partial load mode, the combustion air A flows from the first air supply passage 51a into the first air flow passage 14, and then flows from the first air flow passage 14 into the pair of (upper and lower) first air supply ports 12, and the combustion air A is supplied from the first air supply port 12 to the combustion furnace 200. In addition, the combustion air A flows from the third air supply passage 53a into the third air flow passage 34, and then flows from the third air flow passage 34 into the pair of (upper and lower) third air supply ports 32, and the combustion air A is supplied from the third air supply port 32 to the combustion furnace 200.

[0039] On the other hand, in the partial load mode, the combustion air A does not flow from the second air supply passage 52a to the second air flow passage 24. In the partial load mode, the combustion air A is supplied to the combustion furnace 200 from the first air supply port 12 and the third air supply port 32 and combusted. Therefore, a force that causes the gas (combustion air A) remaining inside the second burner section 20 to flow out toward the combustion furnace 200 acts on the combustion furnace 200 side ends of both the second air supply port 22 above the vertical direction VD of the second burner section 20 and the second air supply port 22 below the vertical direction VD.

[0040] 7, the combustion air A remaining in the second air supply port 22 and the second air flow path 24 of the second burner section 20 is guided from inside the second burner section 20 toward the combustion furnace 200. A force that causes the combustion air A remaining inside the second burner section 20 to flow out is generated in both the second air supply port 22 above the vertical direction VD of the second burner section 20 and the second air supply port 22 below the vertical direction VD of the second burner section 20, so that high-temperature combustion gas is prevented from being guided from the combustion furnace 200 to inside the second burner section 20 (combustion gas is prevented from flowing into the second burner section 20).

[0041] It is possible to prevent the combustion gas C from being drawn into the burner by supplying a seal gas such as air from inside the burner toward the combustion furnace 200 through an air supply port, but a large amount of seal gas may increase costs and adversely affect combustion. Therefore, in this embodiment, when executing the partial load mode, the control unit 60 controls the operation of the ignited and unignited burners as described above without supplying seal gas to the unignited burners, so that the combustion gas C is not drawn into the burners.

[0042] Next, a state in which the gas burner 100 executes a comparative example of the partial load mode will be described. Fig. 8 is a cross-sectional view of the gas burner 100 shown in Fig. 1 taken along the line AA, showing a state in which the gas burner 100 executes a comparative example of the partial load mode. Fig. 9 is a cross-sectional view of the gas burner 100 shown in Fig. 1 taken along the line BB, showing a state in which the gas burner 100 executes a comparative example of the partial load mode.

[0043] 8, in the comparative example of the partial load mode, the fuel gas G flows from the first fuel gas supply passage 41a into the first fuel gas flow passage 13, the fuel gas G branches from the first fuel gas flow passage 13 and flows into a pair (upper and lower) of first fuel gas supply ports 11, and the fuel gas G is supplied from the pair of first fuel gas supply ports 11 to the combustion furnace 200. In addition, the fuel gas G flows from the second fuel gas supply passage 42a into the second fuel gas flow passage 23, the fuel gas G branches from the second fuel gas flow passage 23 and flows into the pair of second fuel gas supply ports 21, and the fuel gas G is supplied from the pair of second fuel gas supply ports 21 to the combustion furnace 200.

[0044] On the other hand, in the comparative example of the partial load mode, the fuel gas G does not flow from the third fuel gas supply passage 43a to the third fuel gas flow passage 33. In the comparative example of the partial load mode, the fuel gas G is supplied from the first fuel gas supply port 11 and the second fuel gas supply port 21 to the combustion furnace 200 and combusted.

[0045] The second burner section 20 is ignited and the fuel gas G has a high flow rate. The third burner section 30 is not ignited and there is no gas flow of the fuel gas G. Because a flow rate difference occurs between the gas flows of the second burner section 20 and the third burner section 30, a gas flow is generated that is drawn from the upper side of the vertical direction VD of the third burner section 30, where the flow rate is low, to the second burner section 20 side, where the flow rate is high. On the other hand, on the lower side of the vertical direction VD of the third burner section 30, a gas flow is generated that draws the combustion gas C from the combustion furnace 200 into the third burner section 30 so as to supplement the gas flow on the upper side of the vertical direction VD.

[0046] Therefore, a force acts on the end of the third fuel gas supply port 31 above the vertical direction VD of the third burner section 30 to cause gas inside the third burner section 30 (such as remaining fuel gas G) to flow out toward the combustion furnace 200. On the other hand, a force does not act on the end of the third fuel gas supply port 31 on the combustion furnace 200 side below the vertical direction VD of the third burner section 30 to cause gas inside the third burner section 30 (such as remaining fuel gas G) to flow out toward the combustion furnace 200.

[0047] 8, the fuel gas G remaining in the third fuel gas supply port 31 and the third fuel gas flow path 33 of the third burner section 30 is guided from the inside of the third burner section 30 toward the combustion furnace 200 via the third fuel gas supply port 31 located above in the vertical direction VD. At that time, the high-temperature combustion gas C present in the combustion furnace 200 is drawn into the inside of the third burner section 30 from the third fuel gas supply port 31 located below the third burner section 30 in the vertical direction VD.

[0048] Therefore, the third fuel gas supply port 31 and the third fuel gas flow passage 33 of the third burner section 30 may be deformed or burned out due to the abnormal temperature rise. Note that it is possible to prevent the combustion gas C from being drawn into the third burner section 30 by supplying a seal gas such as an inert gas from the inside of the third burner section 30 through the third fuel gas flow passage 33 toward the combustion furnace 200, but this requires a large amount of seal gas, which may increase costs and adversely affect combustion.

[0049] 9, in the comparative example of the partial load mode, the combustion air A flows from the first air supply passage 51a into the first air flow passage 14, the combustion air A flows from the first air flow passage 14 into a pair of (upper and lower) first air supply ports 12, and the combustion air A is supplied from the pair of first air supply ports 12 to the combustion furnace 200. In addition, the combustion air A flows from the second air supply passage 52a into the second air flow passage 24, the combustion air A flows from the second air flow passage 24 into a pair of (upper and lower) second air supply ports 22, and the combustion air A is supplied from the pair of second air supply ports 22 to the combustion furnace 200.

[0050] On the other hand, in the comparative example of the partial load mode, the combustion air A does not flow from the third air supply passage 53a to the third air flow passage 34. In the comparative example of the partial load mode, the combustion air A is supplied to the combustion furnace 200 from the first air supply port 12 and the second air supply port 22 and combusted.

[0051] The second burner section 20 is ignited and the combustion air A has a high flow rate. The third burner section 30 is not ignited and the combustion air A has no gas flow or a low flow rate. Because a flow rate difference occurs between the gas flows of the second burner section 20 and the third burner section 30, a gas flow is generated that is drawn from the upper side of the third burner section 30 in the vertical direction VD, where the flow rate is low, to the second burner section 20 side, where the flow rate is high. On the other hand, on the lower side of the third burner section 30 in the vertical direction VD, a gas flow is generated that draws the combustion gas C from the combustion furnace 200 into the third burner section 30 so as to supplement the gas flow on the upper side of the vertical direction VD.

[0052] Therefore, a force acts on the end of the third air supply port 32 above the third burner section 30 in the vertical direction VD of the third burner section 30 to flow out the combustion air A remaining inside the third burner section 30 toward the combustion furnace 200. On the other hand, no force acts on the end of the third air supply port 32 on the combustion furnace 200 side below the vertical direction VD of the third burner section 30 to flow out the combustion air A remaining inside the third burner section 30 toward the combustion furnace 200.

[0053] 9, the combustion air A remaining in the third air supply port 32 and the third air flow path 34 of the third burner unit 30 is guided from inside the third burner unit 30 toward the combustion furnace 200 via the third air supply port 32 above in the vertical direction VD. At that time, the high-temperature combustion gas C present in the combustion furnace 200 is drawn into the inside of the third burner unit 30 from the third air supply port 32 below the third burner unit 30 in the vertical direction VD.

[0054] Therefore, the third air supply port 32 and the third air flow path 34 of the third burner section 30 may be deformed or burned out due to the abnormal temperature rise. It is also possible to prevent the combustion gas C from being drawn into the third burner section 30 by supplying a seal gas such as air from inside the third burner section 30 through the third air supply port 32 toward the combustion furnace 200, but a large amount of seal gas may increase costs and adversely affect combustion.

[0055] The gas burner and the method of operating the gas burner described in each of the above-described embodiments can be understood, for example, as follows. A gas burner (100) according to a first aspect of the present disclosure includes a first burner section (10) having a plurality of first fuel gas supply ports (11) into which a fuel gas (G) and combustion air (A) are introduced and which supply the fuel gas to a combustion furnace (200) and a plurality of first air supply ports (12) which supply the combustion air to the combustion furnace, a second burner section (20) having a plurality of second fuel gas supply ports (21) into which the fuel gas and the combustion air are introduced and which supply the fuel gas to the combustion furnace and a plurality of second air supply ports (22) which supply the combustion air to the combustion furnace, a third burner section (30) having a plurality of third fuel gas supply ports (31) into which the fuel gas and the combustion air are introduced and which supply the fuel gas to the combustion furnace and a plurality of third air supply ports (32) which supply the combustion air to the combustion furnace, and the first burner section, The combustion air supply system includes a fuel gas adjustment unit (40) that adjusts the amount of the fuel gas supplied to the second burner unit and the third burner unit, an air adjustment unit (50) that adjusts the amount of the combustion air supplied to the first burner unit, the second burner unit, and the third burner unit, and a control unit (60) that controls the fuel gas adjustment unit and the air adjustment unit, wherein in the vertical direction, the first burner unit is disposed above the second burner unit and the third burner unit is disposed below the second burner unit, at least two of the second fuel gas supply ports are connected inside the second burner unit, and the control unit executes a first control mode that supplies the fuel gas and the combustion air to the first burner unit and the third burner unit and controls the fuel gas adjustment unit and the air adjustment unit so as not to supply the fuel gas to the second burner unit.

[0056] According to the gas burner according to the first aspect of the present disclosure, when the first control mode is executed, fuel gas flows into the first fuel gas supply port, and the fuel gas is supplied to the combustion furnace. Also, fuel gas flows into the third fuel gas supply port, and the fuel gas is supplied to the combustion furnace. On the other hand, fuel gas does not flow into the second fuel gas supply port, and the fuel gas is not supplied to the combustion furnace. Then, the combustion gas is supplied to the combustion furnace from the first fuel gas supply port and the third fuel gas supply port, and is burned. Therefore, a force that causes the fuel gas remaining inside the second burner section to flow out toward the combustion furnace acts on one end of the second fuel gas supply port and the other end of the second fuel gas supply port of the second burner section.

[0057] Then, the fuel gas remaining in the second fuel gas supply port of the second burner section is guided from inside the second burner section toward the combustion furnace. A force is generated to cause the fuel gas remaining inside the second burner section to flow out from both the second fuel gas supply port on one side of the second burner section and the second fuel gas supply port on the other side of the second burner section, so that high-temperature combustion gas is prevented from being guided from the combustion furnace to inside the second burner section. This makes it possible to prevent the burner section that does not supply fuel gas from being deformed or burned when fuel gas is supplied from some of at least three burner sections arranged at different positions in the vertical direction.

[0058] The gas burner according to a second aspect of the present disclosure is the same as the first aspect, and further includes the following configuration: At least two of the second fuel gas supply ports are arranged at different positions in the vertical direction. According to the gas burner of the second aspect of the present disclosure, in a configuration in which at least two second fuel gas supply ports arranged at different positions in the vertical direction are connected to each other, it is possible to prevent high-temperature combustion gas from flowing from the combustion furnace into the second fuel gas supply port, which would cause the second burner section to deform or burn out.

[0059] The gas burner according to a third aspect of the present disclosure is the first or second aspect, further comprising the following configuration: That is, the at least two second fuel gas supply ports are connected to an end of a second fuel gas flow path (23) on the combustion furnace side, the second fuel gas flow path being connected to a second fuel gas supply path that supplies the fuel gas to the second burner section.

[0060] According to the gas burner of the third aspect of the present disclosure, in a configuration in which at least two second fuel gas supply ports are connected to the end of the second fuel gas flow path on the combustion furnace side, it is possible to prevent high-temperature combustion gas from flowing from the combustion furnace into the second fuel gas supply ports, which would cause the second burner section to deform or burn out.

[0061] The gas burner according to a fourth aspect of the present disclosure is the first or second aspect, further comprising the following configuration: That is, the control unit controls the air adjustment unit to supply only a small amount of the combustion air to the second burner unit when executing the first control mode.

[0062] According to the gas burner of the fourth aspect of the present disclosure, even if the configuration is such that only a small amount of combustion air is supplied to the second burner section when the first control mode is executed, it is possible to prevent high-temperature combustion gas from flowing from the combustion furnace into the second fuel gas supply port, which would cause the second burner section to deform or burn out.

[0063] The gas burner according to a fifth aspect of the present disclosure is the first or second aspect, further comprising the following configuration: That is, the control unit does not supply a seal gas to the second burner unit when executing the first control mode.

[0064] According to the gas burner according to the fifth aspect of the present disclosure, no seal gas is supplied to the second burner section when the first control mode is executed, so there is no increase in cost or adverse effect on combustion due to the supply of seal gas.

[0065] In a method for operating a gas burner according to a sixth aspect of the present disclosure, the gas burner includes a first burner section having a plurality of first fuel gas supply ports into which a fuel gas and combustion air are introduced and which supply the fuel gas to a combustion furnace and a plurality of first air supply ports which supply the combustion air to the combustion furnace, a second burner section having a plurality of second fuel gas supply ports into which the fuel gas and the combustion air are introduced and which supply the fuel gas to the combustion furnace and a plurality of second air supply ports which supply the combustion air to the combustion furnace, and a third burner section having a plurality of third fuel gas supply ports into which the fuel gas and the combustion air are introduced and which supply the fuel gas to the combustion furnace and a plurality of third air supply ports which supply the combustion air to the combustion furnace. a combustion gas supply unit that supplies the fuel gas to the first burner unit, the second burner unit, and the third burner unit, and an air adjustment unit that adjusts the supply amount of the combustion air to the first burner unit, the second burner unit, and the third burner unit, wherein the first burner unit is disposed above the second burner unit and the third burner unit is disposed below the second burner unit, at least two of the second fuel gas supply ports are connected inside the second burner unit, and the combustion gas supply unit is supplied to the first burner unit and the third burner unit while a first operating step is performed in which the fuel gas adjustment unit and the air adjustment unit are operated so as not to supply the fuel gas to the second burner unit.

[0066] According to the gas burner operating method according to the sixth aspect of the present disclosure, when the first operating step is performed, fuel gas flows into the first fuel gas supply port, and the fuel gas is supplied to the combustion furnace. Also, fuel gas flows into the third fuel gas supply port, and the fuel gas is supplied to the combustion furnace. Meanwhile, fuel gas does not flow into the second fuel gas supply port, and the fuel gas is not supplied to the combustion furnace. Then, the combustion gas is supplied to the combustion furnace from the first fuel gas supply port and the third fuel gas supply port, and is burned. Therefore, a force that causes the fuel gas remaining inside the second burner section to flow out toward the combustion furnace acts on one end of the second fuel gas supply port and the other end of the second fuel gas supply port of the second burner section.

[0067] Then, the fuel gas remaining in the second fuel gas supply port of the second burner section is guided from inside the second burner section toward the combustion furnace. A force is generated to cause the fuel gas remaining inside the second burner section to flow out from both the second fuel gas supply port on one side of the second burner section and the second fuel gas supply port on the other side of the second burner section, so that high-temperature combustion gas is prevented from being guided from the combustion furnace to inside the second burner section. This makes it possible to prevent the burner section that does not supply fuel gas from being deformed or burned when fuel gas is supplied from some of at least three burner sections arranged at different positions in the vertical direction.

[0068] The method of operating a gas burner according to a seventh aspect of the present disclosure is the sixth aspect, further comprising the following configuration: That is, at least two of the second fuel gas supply ports are arranged at different positions in a vertical direction. According to the gas burner operating method of the seventh aspect of the present disclosure, in a configuration in which at least two second fuel gas supply ports arranged at different positions in the vertical direction are connected to each other, it is possible to prevent high-temperature combustion gas from flowing from the combustion furnace into the second fuel gas supply port, which would cause the second burner section to deform or burn out.

[0069] The method of operating a gas burner according to an eighth aspect of the present disclosure is the sixth or seventh aspect, further comprising the following configuration: At least two of the second fuel gas supply ports are connected to an end of a second fuel gas flow passage on the combustion furnace side, the second fuel gas flow passage being connected to a second fuel gas supply passage that supplies the fuel gas to the second burner section.

[0070] According to the gas burner of the eighth aspect of the present disclosure, in a configuration in which at least two second fuel gas supply ports are connected to the end of the second fuel gas flow path on the combustion furnace side, it is possible to prevent high-temperature combustion gas from flowing from the combustion furnace into the second fuel gas supply ports, which would cause the second burner section to deform or burn out.

[0071] The method of operating a gas burner according to a ninth aspect of the present disclosure is the sixth or seventh aspect, further comprising the following configuration: That is, the first operating step operates the air adjustment unit so as to supply only a small amount of the combustion air to the second burner unit.

[0072] According to the gas burner operating method of the ninth aspect of the present disclosure, even if the configuration is such that only a small amount of combustion air is supplied to the second burner section when the first operating step is performed, it is possible to prevent high-temperature combustion gas from flowing from the combustion furnace into the second fuel gas supply port, which would cause the second burner section to deform or burn.

[0073] The gas burner operating method according to a tenth aspect of the present disclosure is the sixth or seventh aspect, further comprising the following configuration: In the first operating step, no seal gas is supplied to the second burner section.

[0074] According to the gas burner operating method according to the tenth aspect of the present disclosure, no seal gas is supplied to the second burner section, and therefore no increase in cost or adverse effect on combustion due to the supply of a seal gas occurs. [Explanation of symbols]

[0075] 10 First burner section 11 First fuel gas supply port 12 First air supply port 13 First fuel gas flow path 14 First air flow path 20 Second burner section 21 Second fuel gas supply port 22 Second air supply port 23 Second fuel gas flow path 24 Second air flow path 30 3rd Burner Section 31 Third fuel gas supply port 32 Third air supply port 33 Third fuel gas flow path 34 Third air flow path 40 Fuel gas adjustment section 41 First fuel gas regulating valve 41a First fuel gas supply line 42 Second fuel gas regulating valve 42a Second fuel gas supply line 43 Third fuel gas regulating valve 43a Third fuel gas supply line 50 Air adjustment unit 51 First air regulating valve 51a First air supply passage 52 Second air regulating valve 52a Second air supply passage 53 Third air regulating valve 53a Third air supply passage 60 Control section 100 Gas Burner 200 Combustion Furnace A Combustion air C. Combustion gas G Fuel gas HD horizontal VD Vertical direction

Claims

1. a first burner section into which a fuel gas and combustion air are introduced and which has a plurality of first fuel gas supply ports for supplying the fuel gas to a combustion furnace and a plurality of first air supply ports for supplying the combustion air to the combustion furnace; a second burner section into which the fuel gas and the combustion air are introduced and which has a plurality of second fuel gas supply ports for supplying the fuel gas to the combustion furnace and a plurality of second air supply ports for supplying the combustion air to the combustion furnace; a third burner section into which the fuel gas and the combustion air are introduced and which has a plurality of third fuel gas supply ports for supplying the fuel gas to the combustion furnace and a plurality of third air supply ports for supplying the combustion air to the combustion furnace; a fuel gas adjusting unit that adjusts the amount of the fuel gas supplied to the first burner unit, the second burner unit, and the third burner unit; an air adjusting unit that adjusts the amount of the combustion air supplied to the first burner unit, the second burner unit, and the third burner unit; a control unit for controlling the fuel gas adjusting unit and the air adjusting unit, In a vertical direction, the first burner section is disposed above the second burner section, and the third burner section is disposed below the second burner section, At least two of the second fuel gas supply ports are in communication with each other inside the second burner section, A gas burner in which the control unit executes a first control mode in which the control unit supplies the fuel gas and the combustion air to the first burner unit and the third burner unit, and controls the fuel gas adjusting unit and the air adjusting unit so as not to supply the fuel gas to the second burner unit.

2. 2. The gas burner according to claim 1, wherein at least two of the second fuel gas supply ports are arranged at different positions in a vertical direction.

3. 3. The gas burner according to claim 1, wherein at least two of the second fuel gas supply ports are connected to an end of a second fuel gas flow passage on the combustion furnace side, the end being connected to a second fuel gas supply passage that supplies the fuel gas to the second burner section.

4. 3. The gas burner according to claim 1, wherein the control unit controls the air adjusting unit so as to supply only a small amount of the combustion air to the second burner unit when the first control mode is executed.

5. 3. The gas burner according to claim 1, wherein the control unit does not supply a seal gas to the second burner unit when executing the first control mode.

6. A method of operating a gas burner, comprising the steps of: The gas burner is a first burner section into which a fuel gas and combustion air are introduced and which has a plurality of first fuel gas supply ports for supplying the fuel gas to a combustion furnace and a plurality of first air supply ports for supplying the combustion air to the combustion furnace; a second burner section into which the fuel gas and the combustion air are introduced and which has a plurality of second fuel gas supply ports for supplying the fuel gas to the combustion furnace and a plurality of second air supply ports for supplying the combustion air to the combustion furnace; a third burner section into which the fuel gas and the combustion air are introduced and which has a plurality of third fuel gas supply ports for supplying the fuel gas to the combustion furnace and a plurality of third air supply ports for supplying the combustion air to the combustion furnace; a fuel gas adjusting unit that adjusts the amount of the fuel gas supplied to the first burner unit, the second burner unit, and the third burner unit; an air adjusting unit that adjusts the amount of the combustion air supplied to the first burner unit, the second burner unit, and the third burner unit; The first burner unit is disposed above the second burner unit, and the third burner unit is disposed below the second burner unit, At least two of the second fuel gas supply ports are in communication with each other inside the second burner section, A method for operating a gas burner comprising a first operating step of supplying the fuel gas and the combustion air to the first burner section and the third burner section, while operating the fuel gas adjustment section and the air adjustment section so as not to supply the fuel gas to the second burner section.

7. 7. The method for operating a gas burner according to claim 6, wherein at least two of the second fuel gas supply ports are disposed at different positions in a vertical direction.

8. 8. A method for operating a gas burner as described in claim 6 or claim 7, wherein at least two of the second fuel gas supply ports are connected to an end of a second fuel gas flow passage on the combustion furnace side, the end being connected to a second fuel gas supply passage that supplies the fuel gas to the second burner section.

9. 8. The method for operating a gas burner according to claim 6, wherein the first operating step comprises operating the air adjusting section so as to supply only a minute amount of the combustion air to the second burner section.

10. 8. The method for operating a gas burner according to claim 6, wherein the first operating step does not supply a seal gas to the second burner section.

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