JP2016169933A - Burner for gas fuel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a burner for gas fuel capable of burning while simultaneously supplying a plurality of gas fuels.SOLUTION: In a burner 1 for gas fuel capable of supplying a plurality of gas fuels, a burner nozzle 2 in the burner 1 has a multiple concentric circular pipe structure in which a plurality of pipes for supplying gas are disposed in a multiple concentric state, the pipe of an outermost side is formed into a straight pipe, the pipes inside the outermost side are formed so that inner diameters are gradually reduced toward tip portions, a multiple annular hollow disc 10 is disposed on a tip portion of the burner nozzle 2, tip portions of the pipes excluding the pipe of the outermost side are fitted to an annular hollow portion 10a and the like, of the hollow disc 10, and the tip portions of the pipes fitted thereby are kept into contact with a combustion space 4 at a tip side of the burner nozzle 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gas fuel burner capable of simultaneously supplying and burning a plurality of gaseous fuels, and more particularly for gaseous fuels applicable to a steam generator and a system of an external heating steam reformer that generates hydrogen-rich reformed gas. Regarding the burner.

  For example, hydrogen gas, which is fuel for a fuel cell, is usually generated by a steam reformer. The steam reformer generates a hydrogen-rich reformed gas by reacting a mixture of a raw material gas such as city gas and steam in the presence of a reforming catalyst. The steam supplied to the steam reformer is generated by a steam generator, and water as a raw material and fuel for combustion are supplied to the steam generator.

  In particular, in a domestic fuel cell system or the like, a fuel gas such as city gas or a surplus hydrogen gas recovered from the fuel cell is used as a fuel for combustion for miniaturization and convenience. In such a system using gaseous fuel, the burner of the steam generator is a gaseous fuel burner suitable for gas combustion, and is used as a heated gas generator for supplying heated gas to an externally heated steam reformer. A similar gaseous fuel burner is used.

  A gaseous fuel burner used in a water vapor generator or an externally heated water vapor generator in a fuel cell system has been proposed in Patent Document 1, for example. The burner for gaseous fuel of Patent Document 1 is provided with a primary air supply pipe at the center of the burner nozzle, a fuel supply pipe is connected to the outer periphery of the primary air supply pipe, and a secondary air supply pipe at the tip of the burner nozzle. Are communicating. However, the burner nozzle of Patent Document 1 does not disclose a structure that can supply a plurality of types of gaseous fuel and selectively burn them.

JP 2008-20142 A

  When a plurality of types of gaseous fuels are used, one of them is supplied for combustion, or a plurality of types are supplied simultaneously from different pipes for combustion. For example, the steam generator in the fuel cell system burns gas fuel such as city gas or surplus hydrogen gas recovered from the fuel cell simultaneously or selectively as fuel.

  In a gaseous fuel burner that enables such a gaseous fuel combustion system, it is necessary to maintain the combustion efficiency of the burner at a constant level regardless of whether one type of gaseous fuel or multiple types of gaseous fuel is selected. is there. In order to exhibit such an effect, it is necessary to make the burner nozzle which is the main part of the burner for gaseous fuel into a special structure. As such a burner nozzle structure, for example, a multiple concentric tube structure shown in FIG. 4 is conceivable. FIG. 4 shows a triple concentric tube structure as an example.

  In FIG. 4, the gas fuel burner 1 includes a burner nozzle 2 having a multiple concentric circular tube structure in which a plurality of gas supply pipes are arranged concentrically, and a cylindrical casing 3 in which the burner nozzle 2 is mounted. Inside the casing 3, a combustion space 4 is formed in contact with the axial tip of the burner nozzle 2.

  The burner nozzle 2 has an ignition heater 6 disposed at the center thereof, and a first tube 7, a second tube 8 and a third tube 9 are sequentially disposed outside the burner nozzle 2. The outermost tube is formed in a straight tube shape, and the inner tube from the outermost tube is formed so that the inner diameter decreases toward the tip. A multi-circular hollow disk 10 is provided at the tip of the burner nozzle 2, and two annular support parts 11 are provided in the axially inner direction (left direction in FIG. 4) from the circular hollow part of the hollow disk 10. 12 is extended. The inner peripheral surface of the tip of the third tube 9 constituting the outer peripheral surface of the burner nozzle 2 is fixed to the outer peripheral surface of the hollow disk 10.

  The ignition heater 6 is arranged inside the support portion 11, the first pipe 7 is arranged outside the ignition heater 6 through a space portion, and the second pipe 8 is arranged outside thereof. A primary gas flow passage 20 is formed inside the first pipe 7, a flow passage 21 such as hydrogen gas is formed inside the second pipe 9, and another fuel gas flows inside the third pipe 9. A path 22 is formed. In order to burn the gaseous fuel efficiently, the inner diameters of the gas flow paths 20, 21, 22 are gradually reduced toward the parts fixed to the first support part 11 and the second support part 12, Each gaseous fuel ejected into the combustion chamber 4 is concentrated in the vicinity of the central axis region of the burner nozzle 2, thereby achieving uniform supply and improved combustion efficiency when one or more gaseous fuels are supplied. ing.

  Thus, in order to reduce the inner diameters of the gas flow passages 13 and 14 toward the tip, it is necessary to reduce the inner diameters of the first pipe 7 and the second pipe 8 as illustrated. In the example of FIG. 4, in order to easily manufacture the first tube 7 and the second tube 8, a conical portion is joined to the distal end portion of the straight tube by welding or the like to constitute the whole. In some cases, both of them can be integrated.

  As described above, the first tube 7 and the second tube 8 are fixed to the first support portion 11 or the second support portion 12 by welding in a state where the inner diameter is reduced toward the tip portion, respectively. There is a need. However, for example, if the tip of the first tube 7 is first welded to the first support 11 and then the outer second tube 8 is to be welded to the second support 12, the tip of the second tube 8 Since the inner diameter is smaller than the outer diameter of the straight portion of the first tube 7, the second tube 8 cannot be inserted in the axial direction from the outside of the first tube 7. Therefore, for example, the second pipe 8 is divided into two parts in the vertical direction of FIG. 4 to manufacture parts, and they are aligned on the outside of the first pipe 7 and then welded.

  Thus, when the outer pipe is divided into two parts and welded, the number of parts increases, the number of joints increases, and the assemblability deteriorates. In addition, there is a high risk of welding deformation and poor bonding. Furthermore, since the joining location and the hollow disk 10 are close to each other, there is a risk that a part of the hollow portion that is the opening portion is blocked by the molten metal.

In order to solve these problems, an object of the present invention is to provide a new gaseous fuel burner obtained by further improving and developing the gaseous fuel burner illustrated in FIG.

  A first aspect of the present invention is a gas fuel burner capable of supplying a plurality of gas fuels, wherein the burner nozzle in the burner has a multi-concentric circular tube structure in which a plurality of gas supply tubes are arranged in a multi-concentric manner. The outermost tube is formed in a straight tube shape, the inner tube from the outermost side is formed so that the inner diameter decreases toward the tip, and a multi-circular hollow disk is provided at the tip of the burner nozzle. The tip of each tube excluding the outermost tube is fitted into an annular hollow portion of the hollow disk, and the tip of each fitted tube is in contact with the combustion space on the burner nozzle tip side. (Claim 1).

  According to a second aspect of the present invention, in the first aspect, the burner nozzle has a triple concentric circular tube structure composed of a first tube, a second tube, and a third tube arranged in order from the center, A flow passage for primary air for combustion is formed inside the first pipe, and a gas containing hydrogen or other than hydrogen between the first pipe and the second pipe or between the second pipe and the third pipe Any one of the flow passages of the gas containing the fuel gas is formed (claim 2).

  According to a third aspect of the present invention, in the second aspect, the hollow disk is composed of an inner first disk and an outer second disk arranged concentrically, and the first disk is arranged in the circumferential direction. A plurality of ejection holes are provided, the inner peripheral surface of the first disc is fitted with the outer peripheral surface of the first tube, the outer peripheral surface of the first disc is fitted with the inner peripheral surface of the second tube, A flow path for a gas containing hydrogen is formed between the second pipes, and the second disk is a disk structure with a rising edge having an annular lip extending from the inner periphery of the second pipe toward the combustion space. A plurality of bulging portions protruding in the inner diameter direction are formed at predetermined intervals along the circumferential direction, the bulging portions are fitted to the inner peripheral surface of the second pipe, and the outer peripheral surface of the disk with the rising edge is the third pipe A gas flow passage containing a fuel gas is formed between the second pipe and the third pipe, which is joined to the inner peripheral surface. Motomeko 3).

  In the first aspect of the present invention, as described above, the outermost tube is formed in a straight tube shape, and the inner tube from the outermost side is formed so that the inner diameter is reduced toward the tip portion. The tip of each tube excluding the outermost tube is fitted into the hollow portion of the tube, and the tip of each tube fitted thereby is in contact with the combustion space on the tip side of the burner nozzle.

  If comprised in this way, the number of parts will reduce and a structure will become simple. Furthermore, since the fitting portion of each pipe is configured to be in contact with the combustion space on the tip side of the burner nozzle, airtight welding at the fitting portion is also unnecessary. Thereby, not only the manufacturability is improved, but also the number of welds in the hermetic portion is reduced, and the hermetic reliability is also improved. Due to these various effects, the first invention of the present invention can achieve improvement in manufacturability and reliability in a gas fuel burner having a special structure capable of simultaneously supplying and burning a plurality of gaseous fuels. .

  According to a second aspect of the present invention, in the first aspect, the burner nozzle has a triple concentric circular tube structure composed of a first tube, a second tube, and a third tube arranged in order from the center, A flow passage for primary air for combustion is formed inside the first pipe, and a gas containing hydrogen or other than hydrogen between the first pipe and the second pipe or between the second pipe and the third pipe Any one of the flow passages of the gas containing the fuel gas is formed.

  The gas fuel burner configured as described above is highly flammable and permeable and contains hydrogen that needs to be handled with care. It can be applied safely without worry.

  According to a third aspect of the present invention, in the second aspect, the hollow disk is composed of an inner first disk and an outer second disk arranged concentrically, and the first disk is arranged in the circumferential direction. A plurality of ejection holes are provided, the inner peripheral surface of the first disc is fitted to the outer peripheral surface of the first tube, the outer peripheral surface of the first disc is fitted to the inner peripheral surface of the second tube, A flow path for a gas containing hydrogen is formed between the second pipes, and the second disk is a disk structure with a rising edge having an annular lip extending from the inner periphery of the second pipe toward the combustion space. A plurality of bulging portions protruding in the inner diameter direction are formed at predetermined intervals along the circumferential direction, the bulging portions are fitted to the inner peripheral surface of the second pipe, and the outer peripheral surface of the disk with the rising edge is the third pipe A gas flow passage containing a fuel gas is formed between the second pipe and the third pipe and is joined to the inner peripheral surface.

  If comprised in this way, the gas containing hydrogen will be injected by the optimal spray and distribution state to combustion space by fitting the 1st disk which has an ejection hole between the 1st pipe and the 2nd pipe. And the gas can be burned efficiently. Further, by fitting the bulging portion of the lip in the second disk with the rising edge constituting the nozzle tip with the second tube, the end of the second tube is supported at an appropriate position with a simple and simple structure, The flow path shape between the lip and the second pipe can be appropriately maintained.

The partial sectional side view which shows typically an example of the burner nozzle in the burner for gaseous fuels of this invention. The partial sectional side view which shows typically the other example of the burner nozzle in the burner for gaseous fuels of this invention. The external appearance perspective view of the burner nozzle front-end | tip part seen from the arrow A direction of FIG. Typical partial sectional side view showing a burner for gaseous fuel capable of simultaneously supplying and burning a plurality of conventional gaseous fuels

  FIG. 1 is a partial side sectional view schematically showing an example of a burner nozzle 2 in a gas fuel burner 1 of the present invention. The burner nozzle 2 shown in FIG. 1 is different from the conventional burner nozzle 2 of FIG. The portion is only the joining form of the tip portion of each circular tube, and the other portions are configured similarly. Therefore, the same parts as those in FIG.

  The burner nozzle 2 of FIG. 1 has a triple concentric tube structure in which an ignition heater 6 is disposed at the center, and a first tube 7, a second tube 8 and a third tube 9 are disposed in this order on the outer side. The outermost third tube 9 is formed in a straight tube shape, and the second tube 8 and the first tube 7 tube on the inner side from the outermost side are formed so that the inner diameter decreases toward the tip. A primary air flow passage 20 for combustion is formed inside the first pipe 7, and a gas containing hydrogen between the first pipe 7 and the second pipe 8, for example, surplus hydrogen gas recovered from the fuel cell A flow passage 21 for circulation is formed. Between the 2nd pipe | tube 8 and the outermost 3rd pipe | tube 9, the flow path 22 which distribute | circulates the fuel gas and air mixtures other than hydrogen, such as city gas, is formed.

  The distal ends of the first tube 7, the second tube 8, and the third tube 9 are fitted into the hollow portions 10 a, 10 b, and 10 c of the multiple annular hollow disk 10 disposed at the distal end portion of the burner nozzle 2. Has been. Specifically, the first tube 7 is fitted so that the outer peripheral surface of the first end portion is in close contact with the inner peripheral surface of the innermost annular hollow portion 10a of the hollow disk 10, and the second tube 8 is in the front end portion. The peripheral surface is fitted to the outer peripheral surface of the third annular hollow portion 10 c from the inside of the hollow disk 10. Each fitting is performed using the elasticity in the radial direction at the tip of each tube. Since the outermost third pipe 9 is straight, welding joining can be easily performed, and the inner peripheral surface of the tip portion is airtightly joined to the outer peripheral surface of the hollow disk 10 by welding.

  The innermost annular hollow portion 10a of the hollow disk 10 communicates with the primary air flow passage 20, and the second annular hollow portion 10b from the inner side of the hollow disk 10 is, for example, a flow passage 21 for circulating hydrogen gas. The third annular hollow portion 10c from the inside of the hollow disk 10 communicates with a flow passage 22 through which a mixture of fuel gas other than hydrogen, such as city gas, and air is circulated. In the present embodiment, the second annular hollow portion 10b from the inside of the hollow disk 10 is composed of a plurality of through holes (not shown) arranged in an annular shape in the circumferential direction, and each tube through hole is a gas. It becomes an ejection hole.

  2 is a partial side sectional view schematically showing another example of the burner nozzle 2 in the gas fuel burner 1 of the present invention, and FIG. 3 is a front end portion of the burner nozzle 2 as seen from the direction of arrow A in FIG. FIG. The only difference between the burner nozzle 2 shown in FIG. 2 and the burner nozzle 2 of FIG. 1 is the configuration of the hollow disk 10, and the rest is configured in the same manner as the burner nozzle 2 of FIG. In FIG. 2, in order to facilitate understanding of the shape of each part, the ignition heater 6 disposed in the center is omitted.

  2 and 3, the hollow disk 10 is composed of an inner first disk 13 and an outer second disk 14 that are concentrically arranged, and the first disk 13 has a plurality of ejection holes arranged in the circumferential direction. 13a is provided, the inner peripheral surface of the first disc 13 is fitted to the outer peripheral surface of the first tube 7, the outer peripheral surface of the first disc 13 is fitted to the inner peripheral surface of the second tube 8, and the first tube A gas flow passage 21 containing hydrogen is formed between the second pipe 8 and the second pipe 8.

  The second disk 14 is a disk structure with a rising edge having an annular lip 14a extending from the inner periphery of the second disk 14 in the direction of the combustion space 4. The lip 14a has a bulging portion 14b protruding in the inner diameter direction in the circumferential direction. A plurality (three in the illustrated example) are formed at predetermined intervals along the line. The bulging portion 14 b is fitted with the inner peripheral surface of the second pipe 8. Another lip 14c is formed on the outer periphery of the disk with the rising edge, and the outer peripheral surface of the lip 14c is joined to the inner peripheral surface of the outermost straight tubular third pipe by welding, and the second pipe 8 and the third pipe. 9, a gas flow passage 22 containing fuel gas is formed.

  The burner for gaseous fuel of the present invention is a burner for gaseous fuel that can simultaneously supply and burn a plurality of gaseous fuels, and is particularly suitable for a steam generator and an external heating steam reformer that generates hydrogen-rich reformed gas. Available.

DESCRIPTION OF SYMBOLS 1 Gas fuel burner 2 Burner nozzle 3 Casing 4 Combustion space 6 Ignition heater 7 1st pipe 8 2nd pipe 9 3rd pipe 10 Hollow disk 10a Hollow part 10b Hollow part 10c Hollow part

DESCRIPTION OF SYMBOLS 11 Support part 12 Support part 13 1st disk 14 2nd disk 14a Lip 14b Expansion part 14c Lip 20 Flow path 21 Flow path 22 Flow path

Claims (3)

A gaseous fuel burner (1) capable of supplying a plurality of gaseous fuels,
The burner nozzle (2) in the burner (1) has a multi-concentric circular tube structure in which a plurality of gas supply tubes are arranged in a multi-concentric manner, and the outermost tube is formed in a straight tube shape from the outermost side. The inner tube is formed so that the inner diameter decreases toward the tip, and a multi-circular hollow disc (10) is provided at the tip of the burner nozzle (2), and the annular hollow in the hollow disc (10) The tip of each tube excluding the outermost tube is fitted to the part, and the tip of each tube fitted thereby is configured to contact the combustion space (4) on the tip side of the burner nozzle (2) A gas combustion burner characterized by that. In the gas combustion burner according to claim 1,
The burner nozzle (2) has a triple concentric tube structure composed of a first tube (7), a second tube (8) and a third tube (9) arranged in order from the center,
A primary air flow passage (20) for combustion is formed inside the first pipe (7).
A gas containing hydrogen or a gas containing a fuel gas other than hydrogen between the first pipe (7) and the second pipe (8) or between the second pipe (8) and the third pipe (9) A gas fuel burner characterized in that any one of the flow passages (21), (22) is formed. The gas combustion burner according to claim 2,
The hollow disk (10) is composed of an inner first disk (13) and an outer second disk (14) arranged concentrically,
The first disk (13) is provided with a plurality of ejection holes (13a) arranged in the circumferential direction, and the inner peripheral surface of the first disk (13) is fitted with the outer peripheral surface of the first pipe (7), The outer peripheral surface of the first disk (13) is fitted to the inner peripheral surface of the second pipe (8), and a gas flow passage containing hydrogen (1) between the first pipe (7) and the second pipe (8). 21) is formed,
The second disk (14) is a disk structure with a rising edge having an annular lip (14a) extending from the inner periphery of the second disk (14a) in the combustion space direction. 14b) are formed at predetermined intervals along the circumferential direction, the bulging portion (14b) is fitted to the inner peripheral surface of the second pipe (8), and the outer peripheral surface of the disk with the rising edge is the third pipe ( Gaseous fuel characterized in that a gas flow passage (22) containing fuel gas is formed between the second pipe (8) and the third pipe (9), which is joined to the inner peripheral surface of 9) Burner.

Images