Piping for combustion equipment

Abstract

This technology provides a way to suppress detonation while ensuring sufficient gas flow. [Solution] In a piping system for supplying gas to a combustion device, the piping comprises a wall extending in the axial direction of the piping, and a plurality of partitioned flow paths, each partitioned by the wall, through which gas flows. In a cross-section perpendicular to the direction of gas flow in the piping, the maximum dimensions in each region of the plurality of partitioned flow paths are less than or equal to the size of the detonation cell.

Description

Technical Field

[0001] The present disclosure relates to piping for a combustion device.

Background Art

[0002] In a pipe that supplies gas to a combustion device, a technique for suppressing the occurrence of detonation is known. For example, Patent Document 1 discloses a flame arrester including a disk and a plurality of ring-shaped plates arranged in order toward the upstream of the flow path. In the pipe, all the gas passes through the slit between adjacent ring-shaped plates and flows downstream through the outer periphery of the disk. Patent Document 1 gives an example of the slit width of 0.1 mm.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technique of Patent Document 1, if the width of the slit is made very small, the possibility of detonation can be reduced, but the pressure loss increases and the flow rate of the gas in the pipe decreases. Also, if the width of the slit is increased, there is a risk of detonation. Therefore, there has been a demand for a technique that can suppress the occurrence of detonation while ensuring the flow rate of the gas.

Means for Solving the Problems

[0005] The present disclosure has been made to solve the above problems and can be realized in the following forms.

[0006] According to an embodiment of the present disclosure, a pipe for supplying gas to a combustion device is provided. The pipe comprises a wall portion extending in the axial direction of the pipe, and a plurality of partitioned flow channels, each partitioned by the wall portion, through which the gas flows. In a cross-section perpendicular to the direction of gas flow in the pipe, the maximum dimension in each of the plurality of partitioned flow channels is less than or equal to the size of the detonation cell. With this type of piping, the walls that partition multiple compartmentalized flow paths extend along the axial direction of the piping, allowing for a higher gas flow rate compared to configurations with plate-like structures perpendicular to the axial direction of the piping. Furthermore, since the maximum dimensions in each of the multiple compartmentalized flow paths are less than or equal to the detonation cell size, the occurrence of detonation can be suppressed. Therefore, it is possible to suppress the occurrence of detonation while ensuring a sufficient gas flow rate.

[0007] Furthermore, this disclosure can be implemented in various forms, for example, in the form of a combustion system equipped with this type of piping, or a method for manufacturing the piping. [Brief explanation of the drawing]

[0008] [Figure 1] This is a diagram illustrating the piping system. [Figure 2] This is a schematic cross-sectional view showing the axial cross-section of the piping. [Figure 3] This is a schematic cross-sectional view showing a cross-section perpendicular to the gas flow direction of the main part in the modified example. [Modes for carrying out the invention]

[0009] A. First Embodiment: Figure 1 is an explanatory diagram of piping 100 in one embodiment of the present disclosure. Figure 2 is a schematic cross-sectional view showing an axial cross-section of piping 100. In this embodiment, piping 100 is connected to a combustion device and supplies gas to the combustion device. The gas is a flammable gas. Piping 100 comprises a main section 10 having a wall section 11 and a plurality of partitioned flow path sections 12, and a joint section 20.

[0010] The main section 10 is the part of the piping 100 in which a partitioned flow path section 12 is formed by the wall section 11. In this embodiment, the main section 10 is composed of a plurality of small-diameter pipes that are thinner than the joint section 20. The number of small-diameter pipes is determined by the desired flow rate of combustible gas supplied to the combustion device.

[0011] The wall portion 11 is a part that extends in the axial direction of the pipe 100. The wall portion 11 divides the inside of the pipe 100 in a direction perpendicular to the axial direction. In this embodiment, the wall portion 11 is a wall that constitutes a small-diameter pipe. The wall portion 11 also constitutes the outer shape of the pipe 100 in the main portion 10.

[0012] The partitioned flow path section 12 is a flow path defined and formed by partitioning the inside of the piping 100 by the wall section 11. A flammable gas flows through the partitioned flow path section 12. In this embodiment, the partitioned flow path section 12 is the space inside each small-diameter pipe.

[0013] In a cross-section perpendicular to the gas flow direction in the piping 100, the maximum dimension in each region of the multiple partitioned flow channels 12 is less than or equal to the detonation cell size. The maximum dimension is the maximum value obtained by measuring along any direction perpendicular to the axial direction of the piping 100 within the region of each partitioned flow channel 12. The detonation cell size is the width of the cell formed by detonation. The detonation cell size is determined by the type of flammable gas and the mixing ratio with air or oxygen desired by the combustion device. In this embodiment, the partitioned flow channels 12 are flow channels formed by small-diameter piping with an inner diameter L1 less than or equal to the detonation cell size. The inner diameter L1 is, for example, 15 mm. It is preferable that the inner diameter L1 is at least half the size of the detonation cell size so that the flow rate of the flammable gas can be ensured.

[0014] The joint section 20 is a portion of the piping 100 that is not partitioned by the wall section 11, and is a portion where multiple partitioned flow channels 12 converge. The axial length L2 of the joint section 20 is longer than the axial length of the main section 10. The axial length L2 of the joint section 20 is, for example, 300 mm or more and 500 mm or less. In this embodiment, the joint section 20 is a short pipe that can accommodate the ends of all small-diameter pipes in the radial direction. The main section 10 and the joint section 20 are connected by welding or a sealing member (not shown) to prevent leakage of flammable gas.

[0015] Furthermore, the joint sections 20 are provided at both ends of the piping 100. In other words, the joint sections 20 are provided at both ends of the main section 10. Therefore, the flammable gas supplied from the outside flows through the joint sections 20, then branches into multiple partitioned flow channels 12, and then rejoins at the joint sections 20 before flowing into the combustion device.

[0016] As described above, the piping 100 of this embodiment has walls 11 that divide the multiple partitioned flow channels 12 that extend along the axial direction of the piping 100. Therefore, compared to a configuration with a plate-like structure perpendicular to the axial direction of the piping 100, a larger gas flow rate can be achieved. Furthermore, since the maximum dimensions in each region of the multiple partitioned flow channels 12 are less than or equal to the detonation cell size, the occurrence of detonation can be suppressed. Thus, the occurrence of detonation can be suppressed while ensuring a sufficient gas flow rate.

[0017] B. Other embodiments: (B1) In the embodiment described above, the wall portion 11 is a wall constituting a small-diameter pipe and constitutes the outer shape of the pipe 100 in the main portion 10. The wall portion 11 is not limited to this and may be a plate-shaped member. In this case, a part of the wall portion 11 is in contact with the periphery inside the pipe 100 and forms at least a part of the partitioned flow channel portion 12. Alternatively, the wall portion 11 may be a columnar member provided with a plurality of independent through holes extending in the axial direction.

[0018] (B2) In the above-described embodiment, the main part 10 is composed only of a plurality of small-diameter pipes. However, it is not limited to this, and the main part 10 may be composed of a large-diameter pipe and small-diameter pipes that can accommodate all the small-diameter pipes in the radial direction. FIG. 3 is a cross-sectional view schematically showing a cross-section perpendicular to the gas flow direction of the main part 10 in a modified example. In this case, the partitioned flow path part 12 is an area inside the small-diameter pipe and an area between the wall of the small-diameter pipe and the large-diameter pipe. In the area between the wall of the small-diameter pipe and the large-diameter pipe, the maximum value of the dimension obtained by measuring along an arbitrary direction orthogonal to the axial direction of the pipe 100 is less than or equal to the detonation cell size. For example, the length L3, which is the maximum value of the dimension obtained by measuring along an arbitrary direction orthogonal to the axial direction of the pipe 100 within the shaded area in FIG. 3, is less than or equal to the detonation cell size.

[0019] (B3) In the above-described embodiment, the joint part 20 is provided at both ends of the pipe 100. However, it is not limited to this, and the joint part 20 may be provided only at one end of the pipe 100. In this case, at the other end of the pipe 100, the partitioned flow path parts 12 are respectively connected to the combustion device. Also, the pipe 100 may not include the joint part 20.

[0020] (B4) In the above-described embodiment, a combustible gas flows through the pipe 100. However, it is not limited to this, and air or a supporting combustible gas may flow through the pipe 100.

[0021] The present disclosure is not limited to the above-described embodiments, and can be realized in various configurations without departing from the gist thereof. For example, the technical features in the embodiments corresponding to the technical features in each form described in the summary of the invention can be appropriately replaced or combined in order to solve the above-described problems or to achieve some or all of the above-described effects. Also, if the technical feature is not described as essential in this specification, it can be appropriately deleted.

Explanation of symbols

[0022] 10...Main section, 11...Wall section, 12...Partitioned flow path section, 20...Joint section, 100...Piping

Claims

[Claim 1] A pipe for supplying gas to a combustion device, Within the aforementioned pipe, a wall portion extending in the axial direction of the pipe, The inside of the piping is defined by the wall portion, and comprises a plurality of partitioned flow paths through which the gas flows, A pipe in which, in a cross-section perpendicular to the gas flow direction, the maximum dimension in each of the multiple partitioned flow path regions is less than or equal to the detonation cell size.

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