Flashback detection system

Abstract

This technology provides a way to detect flashback without using a flame arrestor. [Solution] The flashback detection system comprises a pipe having an inlet for gas to flow in and an outlet for gas to flow out; a flame arrestor provided in the pipe to extinguish flashbacks that occur in the pipe; a valve provided in the pipe on the inlet side of the flame arrestor to block the flow of gas; a purge section to purge the pipe; a sensor provided in the pipe on the outlet side of the flame arrestor to measure at least one of the temperature and pressure inside the pipe; and a control unit that controls the closing of the valve and the initiation of purging of the purge section when the measured value is above a predetermined threshold.

Description

Technical Field

[0001] The present disclosure relates to a backfire detection system.

Background Art

[0002] For example, a technique for preventing backfire is known by disposing a flame arrester such as that of Patent Document 1 in a flow path of a combustible gas.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The flame arrester has a problem that it functions only once.

Means for Solving the Problems

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

[0006] According to an aspect of the present disclosure, a backfire detection system is provided. The backfire detection system includes a pipe having an inflow portion into which a gas flows and an outflow portion from which the gas flows out, a flame arrester provided in the pipe for extinguishing a backfire generated in the pipe, a valve portion provided on the inflow portion side of the pipe with respect to the flame arrester for blocking the flow of the gas, a purge portion for purging the pipe, a sensor provided on the outflow portion side of the pipe with respect to the flame arrester for measuring at least one of a temperature and a pressure in the pipe, and a control portion for performing control to close the valve portion and start the purge of the purge portion when the measured value is greater than or equal to a predetermined threshold value. This type of flashback detection system can detect and purge a flashback before the flame propagates to the flame arrestor. Therefore, flashbacks can be detected without using a flame arrestor.

[0007] Furthermore, this disclosure can be implemented in various forms, for example, as a flashback detection system method, a flashback extinguishing method, a valve control method, and so on. [Brief explanation of the drawing]

[0008] [Figure 1] This is an explanatory diagram of the flashback detection system. [Modes for carrying out the invention]

[0009] A. First Embodiment: Figure 1 shows an embodiment of the flashback detection system 100 of the present disclosure, comprising a piping 10, a flame arrestor 20, a valve 30, a purge 40, a sensor 50, and a control unit 60. The flashback detection system 100 detects flashback in the piping 10.

[0010] A gas flows through the piping 10 in the direction of arrow A1. The gas is, for example, hydrogen gas. The piping 10 has an inlet 11 through which the gas flows in and an outlet 12 through which the gas flows out. The inlet 11 is connected, for example, to a valve unit which is the source of the gas. The outlet 12 is connected, for example, to a burner which is the destination of the gas.

[0011] The flame arrester 20 is installed inside the piping 10 and extinguishes flashbacks that occur in the piping 10 while circulating gas through it. The flame arrester 20 is formed by overlapping many metal mesh structures, such as stainless steel or nickel alloy. The gas passes through the gaps in the mesh. Flashbacks are extinguished when heat is removed through contact with the metal mesh.

[0012] The valve 30, when closed, blocks the flow of gas in the piping 10. The valve 30 is, for example, a butterfly valve. The valve 30 is located in the piping 10 on the inlet side 11 of the flame arrester 20. That is, the valve 30 is located in the piping 10 upstream of the flame arrester 20.

[0013] The purge unit 40 purges the piping 10. More specifically, the purge unit 40 performs a purge in the piping 10 to discharge the gas on the outlet side 12 beyond the valve unit 30. The purge unit 40 includes, for example, an inert gas supply unit that supplies inert gas to the piping 10, and a purge valve that, when opened, allows the inert gas to flow from the inert gas supply unit to the piping 10. The purge unit 40 is connected to the outlet side 12 beyond the valve unit 30 in the piping 10.

[0014] Sensor 50 measures the temperature inside the pipe 10. In this embodiment, sensor 50 is a thermocouple. Sensor 50 is installed in the pipe 10 on the outlet side 12 of the flame arrester 20. That is, sensor 50 is installed in the pipe 10 downstream of the flame arrester 20. Therefore, sensor 50 can detect flashback before the flame arrester 20. Sensor 50 transmits the measured value to the control unit 60.

[0015] The control unit 60 is configured as a computer comprising a CPU, memory, and interface circuits to which each component of the flashback detection system 100 is connected. The control unit 60 controls the closing of the valve section 30 and the purging section 40 by executing a control program stored in memory. However, some or all of this function may be implemented by hardware circuits.

[0016] The control unit 60 controls the closing of the valve section 30 and the purging of the purge section 40 when the measured value measured by the sensor 50 is greater than or equal to a predetermined threshold. The threshold is a value that indicates the occurrence of flashback in the piping 10 and can be determined in advance experimentally or empirically. In other words, the control unit 60 controls the extinguishing of flashback when flashback occurs in the piping 10.

[0017] According to the flashback detection system 100 of this embodiment described above, a flashback can be detected and purged before the flame propagates to the flame arrestor 20. Therefore, a flashback can be detected without using the flame arrestor 20.

[0018] B. Other embodiments: In the embodiment described above, the sensor 50 measures the temperature inside the pipe 10. However, the sensor 50 is not limited to this, and it is sufficient if it is capable of measuring at least one of the temperature and pressure inside the pipe 10.

[0019] This disclosure is not limited to the embodiments described above, and can be implemented in various configurations without departing from its spirit. 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 replaced or combined as appropriate in order to solve the problems described above or to achieve some or all of the effects described above. Furthermore, if a technical feature is not described as essential in this specification, it can be deleted as appropriate. [Explanation of symbols]

[0020] 10...Piping, 11...Inlet, 12...Outlet, 20...Flame arrester, 30...Valve, 40...Purge, 50...Sensor, 60...Control unit, 100...Flashback detection system

Claims

[Claim 1] It is a flashback detection system, A pipe having an inlet for gas to enter and an outlet for gas to exit, A flame arrestor is provided within the aforementioned piping to extinguish flashbacks that occur in the piping, In the aforementioned piping, a valve portion is provided on the inlet side of the flame arrester to block the flow of the gas, A purging section for purging the aforementioned piping, A sensor provided in the aforementioned piping on the outlet side of the flame arrester, capable of measuring at least one of the temperature and pressure values ​​inside the piping, A flashback detection system comprising a control unit that controls the closing of the valve section and the initiation of the purging of the purge section when the measured value is greater than or equal to a predetermined threshold.

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