Detonation prevention structure

Abstract

To provide a detonation prevention structure that can suppress the occurrence of detonation. [Solution] The detonation prevention structure 10 comprises an air pipe 11 for supplying oxygen-containing air, a primary gas pipe 12 and a secondary gas pipe 13 for supplying flammable gas, a shut-off valve 14 provided between the primary gas pipe 12 and the secondary gas pipe 13 and capable of supplying and shutting off flammable gas, and a burner 15 to which the air pipe 11 and the secondary gas pipe 13 are connected, and the length of the secondary gas pipe 13 is set to be less than the DID (distance to transition from defragmentation to detonation).

Description

Technical Field

[0001] The present invention relates to an explosion prevention structure.

Background Art

[0002] In Patent Document 1, a separation part is provided between a control operation part and a burner in a supply path to separate the burner from the control operation part such that the distance between the flame port of the burner and an extinguishing element is less than the DDT (Deflagration to Detonation Transition) distance. The burner diffuses and burns the hydrogen supplied at 100 vol%, and a hydrogen combustion device in which hydrogen is supplied at a rate equal to or higher than the combustion rate of hydrogen is described.

[0003] Note that "DDT (Deflagration to Detonation Transition)" means the transition from deflagration to detonation, and the "DDT distance" means the distance from the ignition source, that is, the flame port of the burner, to the transition to detonation.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when the structure is such that air flows into the gas pipe during digestion to form a mixture, there is a problem that air flows into the gas pipe side only by providing an extinguishing element.

Means for Solving the Problems

[0006] The explosion prevention structure of one embodiment is configured such that air and gas do not mix except within a range where the length of the gas supply pipe after the shut-off valve is less than the DID. [Effects of the Invention]

[0007] The detonation prevention structure of this disclosure can suppress the occurrence of detonation. [Brief explanation of the drawing]

[0008] [Figure 1] This is a cross-sectional view showing an example of a detonation prevention structure according to Embodiment 1. [Figure 2] This is a cross-sectional view showing an example of combustion and fire extinguishing using the detonation prevention structure according to Embodiment 1. [Figure 3] This is a cross-sectional view showing an example of a detonation prevention structure according to another embodiment. [Modes for carrying out the invention]

[0009] Embodiment 1 Embodiments of the present invention will be described below with reference to the drawings. Figure 1 is a cross-sectional view showing an example of a detonation prevention structure according to Embodiment 1. In Figure 1, the detonation prevention structure 10 includes an air pipe 11, a primary gas pipe 12, a secondary gas pipe 13, a shut-off valve 14, and a burner 15.

[0010] Air piping 11 is piping that supplies air containing oxygen. The primary gas piping 12 is a pipe that supplies flammable gas. The secondary gas piping 13 is a pipe that supplies flammable gas. The length of the secondary gas piping 13 is less than the DID (Detonation Induction Distance: the distance required to transition from defragmentation to detonation).

[0011] The shut-off valve 14 is installed between the primary gas piping 12 and the secondary gas piping 13, and is a valve capable of supplying and shutting off flammable gas.

[0012] Next, combustion and fire extinguishing in the detonation prevention structure 10 will be described. Figure 2 is a cross-sectional view showing an example of combustion and fire extinguishing by the detonation prevention structure according to Embodiment 1.

[0013] During combustion, as shown in Figure 2A, the air supplied from the air pipe 11 and the combustible gas supplied from the secondary gas pipe 13 are mixed and burned in the burner 15. During combustion, combustible gas is supplied from the primary gas pipe 12 to the secondary gas pipe 13, so no air flows into the secondary gas pipe 13. Also, since air is supplied to the air pipe 11, no combustible gas flows into the air pipe 11.

[0014] During fire suppression, as shown in Figure 2B, the gas inside the burner 15 disperses, and air flows into the secondary gas piping 13, creating a fuel-air mixture. At this time, the shut-off valve 14 prevents air from flowing into the primary gas piping 12. Furthermore, because the length of the secondary gas piping 13 is less than the distance at which deflagration transitions to detonation (DID), detonation is prevented from occurring in the fuel-air mixture within the secondary gas piping 13.

[0015] Thus, according to the detonation prevention structure of Embodiment 1, by ensuring that air and gas are mixed only within a range below DID, the inflow of air into the gas piping can be suppressed, thereby suppressing the occurrence of detonation.

[0016] It should be noted that the present invention is not limited to the embodiments described above, and can be modified as appropriate without departing from the spirit of the invention. For example, Figure 3 is a cross-sectional view showing an example of a detonation prevention structure according to another embodiment. In Figure 3, components identical to those in Figure 1 are given the same numbers and their descriptions are omitted.

[0017] In Figure 3, the detonation prevention structure 30 comprises an air pipe 11, a primary gas pipe 12, a secondary gas pipe 31, a shut-off valve 14, and a burner 15.

[0018] The secondary gas pipe 31 has a larger diameter for a part of the pipe. And the secondary gas pipe 31 has a pipe shape such that the distance (DID) for transition from deflagration to detonation becomes longer.

[0019] Thus, by making the shape of a part of the pipe less likely to cause detonation, the degree of freedom in pipe specifications is improved.

[0020] Also, the shut-off valve may be a check valve.

Explanation of Signs

[0021] 10, 30 Detonation prevention structure 11 Air pipe 12 Primary gas pipe 13, 31 Secondary gas pipe 14 Shut-off valve 15 Burner

Claims

[Claim 1] Air piping that supplies oxygen-containing air, Primary and secondary gas piping for supplying flammable gas, A shut-off valve is provided between the primary gas piping and the secondary gas piping, and is capable of supplying and shutting off flammable gas. The system includes a burner to which the aforementioned air piping and the aforementioned secondary gas piping are connected, The detonation prevention structure wherein the length of the secondary gas piping is less than the DID (distance from defragmentation to detonation).

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