Multi-stage discharge system for discharge pipeline of hydrogen refueling station

Abstract

The invention discloses a multi-stage discharge system for a discharge pipeline of a hydrogen refueling station. The multi-stage discharge system comprises a main discharge pipeline and a plurality of discharge bypasses, one end of the main bleeding pipeline is used for being communicated with a hydrogen pipeline of a hydrogen refueling station, the other end of the main bleeding pipeline is provided with a main bleeding outlet, a pressure transmitter is arranged on the leading-in port side of the main bleeding pipeline and used for monitoring the pressure of the main bleeding pipeline in real time, and a first flame arrester is arranged on the main bleeding pipeline at the rear end of the pressure transmitter; the multiple diffusion bypasses are connected with the main diffusion pipeline in parallel, a rupture disk is arranged on the inlet side of each diffusion bypass, the rupture disks are used for triggering and conducting the diffusion bypasses when the internal pressure is too high, and second rupture disks are further arranged on the diffusion bypasses. The multiple diffusion bypasses are arranged on the main diffusion pipeline in parallel, and the trigger pressure of the rupture discs on the diffusion bypasses is sequentially increased, so that the rupture discs on the bypasses can be prevented from being triggered at the same time, and the multiple protection effects of the diffusion bypasses are ensured.

Description

Technical Field

[0001] The invention relates to the field of hydrogen refueling stations, and in particular to a multi-stage discharge system for a discharge pipeline of a hydrogen refueling station. Background Art

[0002] There are two main types of hydrogen release at hydrogen refueling stations: one is a small amount of hydrogen release, such as hydrogen refueling machine release, pipeline replacement, etc.; the other is a large amount of hydrogen release, such as gas replacement of high-pressure storage tanks during commissioning, release of hydrogen in high-pressure storage tanks in emergency situations, etc. The safety hazards of hydrogen refueling stations mainly come from the latter. When a large amount of hydrogen is released quickly, the released high-speed hydrogen may ignite due to friction with the air. When the release stops, it may backfire and enter the release port, causing the flame arrester to block the release pipe.

[0003] In order to solve the above problems, the patent document with patent number 202120817728.9 discloses a backup venting system for the vent pipeline of a hydrogen refueling station, including: a hydrogenation system, a vent main pipe, a vent riser, a flame arrester, a solenoid valve, a pressure sensor, a control unit, an exhaust port and a data center; one end of the pressure sensor is connected to the detection point of the vent main pipe, one end of the vent main pipe is connected to the hydrogenation system, the other end of the vent main pipe is connected to the vent riser near the bottom end, the bottom end of the vent riser is connected to the ground, the top of the vent riser is connected to one end of the flame arrester, the other end of the flame arrester is connected to the exhaust port, one end of the solenoid valve is connected to one end of the flame arrester, and the other end of the solenoid valve is connected to the other end of the flame arrester; the two ends of the control unit are electrically connected to the other end of the pressure sensor and the solenoid valve respectively, and the control unit is communicatively connected to the data center.

[0004] The above technical solution determines whether the flow capacity of the flame arrester is normal by detecting the air pressure at the detection point on the vent main pipe; and enhances the exhaust capacity of the vent riser by controlling the solenoid valve in the backup venting system to avoid excessive air pressure in the vent riser and the vent main pipe, thereby ensuring the safety of the hydrogen refueling station.

[0005] However, since the high-pressure hydrogen in the hydrogen refueling station is stored in stages, there is a scenario where different bottle groups are released in groups. After the flame arrester is blocked due to the release of the previous bottle group, if another bottle group is released at this time, it will cause a serious accident of pipeline overpressure and bursting.

[0006] Therefore, it is necessary to improve such a structure to overcome the above-mentioned defects. Summary of the invention

[0007] The object of the present invention is to provide a multi-stage discharge system for a discharge pipeline of a hydrogen filling station to solve the problems existing in the prior art.

[0008] The above technical objectives of the present invention are achieved through the following technical solutions:

[0009] A multi-stage discharge system for a discharge pipeline of a hydrogen refueling station, comprising a main discharge pipeline and a plurality of discharge bypasses connected to the main discharge pipeline;

[0010] One end of the main venting pipeline is set as an inlet, which is used to communicate with the hydrogen pipeline of the hydrogen filling station, and the other end of the main venting pipeline is set as a main venting outlet, and the gas introduced through the inlet end is discharged through the main venting outlet. A pressure transmitter is provided on the inlet side of the main venting pipeline, which is used to monitor the pressure of the main venting pipeline in real time, and a first flame arrester is provided on the main venting pipeline at the rear end of the pressure transmitter;

[0011] Several of the relief bypasses are respectively arranged in parallel with the main relief pipeline. A bursting disc is provided on the inlet side of each relief bypass. The bursting disc is used to trigger the conduction of the relief bypass when the internal pressure is too high. A second bursting disc is also provided on the relief bypass.

[0012] Furthermore, the internal pressure of the main relief pipeline during relief is lower than the triggering pressure of the bursting disc, and the triggering pressures of the bursting discs are arranged in a step-by-step manner from low to high.

[0013] Furthermore, a discharge pipeline is provided on the main discharge pipeline, and a plurality of connection points are provided on the discharge pipeline, and the discharge pipeline is connected with the discharge bypass through the connection points.

[0014] A multi-stage discharge method for a hydrogen station discharge pipeline comprises the following steps:

[0015] 1) When the hydrogen refueling station needs to release, the main release pipeline is connected, and the high-pressure hydrogen enters the main release pipeline through the main release pipeline inlet and is discharged through the main release outlet;

[0016] 2) During the above process, the pressure transmitter monitors the internal pressure of the main relief pipeline in real time. If the internal pressure rises due to excessive relief, the relief amount is reduced to avoid triggering the bursting disc;

[0017] 3) When the internal pressure of the main relief pipeline remains high or decreases slowly, it is determined that the first flame arrester may be blocked and needs to be replaced in time; if the internal pressure of the main relief pipeline is greater than the triggering pressure of the bursting disc, the bursting disc with the lowest bursting pressure setting triggers the corresponding relief bypass to be opened, and the high-pressure hydrogen in the main relief pipeline enters the corresponding relief bypass through the discharge pipeline to reduce the internal pressure of the main relief pipeline;

[0018] 4) If the internal pressure of the main relief pipeline continues to rise, the bursting discs will trigger the corresponding relief bypasses in sequence according to the set trigger pressures, and the high-pressure hydrogen in the main relief pipeline will enter the corresponding relief bypasses through the discharge pipeline. Multiple relief bypasses will work simultaneously to reduce the internal pressure of the main relief pipeline.

[0019] In summary, the present invention has the following beneficial effects:

[0020] 1. By setting several relief bypasses in parallel on the main relief pipeline, and raising the triggering pressure of the bursting discs on each relief bypass in turn, it is possible to avoid the bursting discs of each bypass from being triggered at the same time, thus ensuring the multiple protection effects of the relief bypass.

[0021] 2. The structure of bursting disc and flame arrester in series can ensure safe pressure relief, play a double protection role for the hydrogen refueling station system, and greatly improve the safety and reliability of the hydrogen refueling station system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a multi-stage discharge system for a hydrogenation station discharge pipeline according to the present invention. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with illustrations and specific embodiments.

[0024] like Figure 1 As shown, the present invention proposes a multi-stage discharge system for a discharge pipeline of a hydrogen refueling station, comprising a main discharge pipeline 1 and a plurality of discharge bypasses 2 connected to the main discharge pipeline 1;

[0025] One end of the main venting pipeline 1 is set as an inlet, which is used to communicate with the hydrogen pipeline of the hydrogen filling station. The other end of the main venting pipeline 1 is set as a main venting outlet. The gas introduced through the inlet end is discharged through the main venting outlet. A pressure transmitter 11 is provided on the inlet side of the main venting pipeline 1 to monitor the pressure of the main venting pipeline 1 in real time. A first flame arrester 12 is provided on the main venting pipeline 1 at the rear end of the pressure transmitter 11;

[0026] The plurality of relief bypasses 2 are respectively arranged in parallel with the main relief pipeline 1 , and a bursting disc 21 is provided on the inlet side of each relief bypass 2 , and the bursting disc 21 is used to trigger the conduction of the relief bypass 2 when the internal pressure is too high. A second bursting disc 22 is also provided on the relief bypass 2 .

[0027] The internal pressure of the main relief pipeline 1 during relief is lower than the triggering pressure of the bursting disc 21 , and the triggering pressures of the bursting discs 21 are arranged in a step-by-step manner from low to high.

[0028] The main relief pipeline 1 is provided with a discharge pipeline 3 , and a plurality of connection points are provided on the discharge pipeline 3 , and the discharge pipeline 3 is connected with the relief bypass 2 through the connection points.

[0029] A multi-stage discharge method for a hydrogen station discharge pipeline comprises the following steps:

[0030] 1) When the hydrogen refueling station needs to release, the main release pipeline 1 is connected, and the high-pressure hydrogen enters the main release pipeline 1 through the main release pipeline 1 inlet and is discharged through the main release outlet;

[0031] 2) During the above process, the pressure transmitter 11 monitors the internal pressure of the main relief pipeline 1 in real time. If the internal pressure rises due to excessive relief, the relief amount is reduced to avoid triggering the bursting disc 21;

[0032] 3) When the internal pressure of the main venting pipeline 1 maintains a high pressure or decreases slowly, it is determined that the first flame arrester 12 may be blocked and needs to be replaced in time; if the internal pressure of the main venting pipeline 1 is greater than the triggering pressure of the bursting disc 21, the bursting disc 21 with the lowest bursting pressure setting triggers the explosion to conduct the corresponding venting bypass 2, and the high-pressure hydrogen in the main venting pipeline 1 enters the corresponding venting bypass 2 through the discharge pipeline 3 to reduce the internal pressure of the main venting pipeline 1;

[0033] 4) If the internal pressure of the main relief pipeline 1 continues to rise, the bursting disc 21 is triggered to explode and open the corresponding relief bypass 2 in sequence according to the set trigger pressure, and the high-pressure hydrogen in the main relief pipeline 1 enters the corresponding relief bypass 2 through the discharge pipeline 3. Multiple relief bypasses 2 work simultaneously to reduce the internal pressure of the main relief pipeline 1.

[0034] In this document, the directions or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "vertical", and "horizontal" are based on the directions or positional relationships shown in the accompanying drawings and are only for the clarity of expressing the technical solutions and the convenience of description, and therefore should not be understood as limitations of the present invention.

[0035] In this document, the terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than those listed and may also include additional elements not expressly listed.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A multi-stage discharge system for a hydrogenation station discharge pipeline, characterized in that: It comprises a main discharge pipeline (1) and a plurality of discharge bypasses (2) connected to the main discharge pipeline (1); One end of the main venting pipeline (1) is set as an inlet, which is used to communicate with the hydrogen pipeline of the hydrogen filling station, and the other end of the main venting pipeline (1) is set as a main venting outlet, and the gas introduced through the inlet end is discharged through the main venting outlet. A pressure transmitter (11) is provided on the inlet side of the main venting pipeline (1) for real-time monitoring of the pressure of the main venting pipeline (1), and a first flame arrester (12) is provided on the main venting pipeline (1) at the rear end of the pressure transmitter (11); A plurality of the relief bypasses (2) are respectively arranged in parallel with the main relief pipeline (1), and a bursting disc (21) is provided on the inlet side of each relief bypass (2). The bursting disc (21) is used to trigger the conduction of the relief bypass (2) when the internal pressure is too high. A second bursting disc (22) is also provided on the relief bypass (2).

2. The multi-stage discharge system for the discharge pipeline of a hydrogen refueling station according to claim 1 is characterized in that: The internal pressure of the main relief pipeline (1) during relief is lower than the triggering pressure of the bursting disc (21), and the triggering pressures of the bursting discs (21) are arranged in a step-by-step manner from low to high.

3. The multi-stage discharge system for the discharge pipeline of a hydrogen refueling station according to claim 2 is characterized in that: The main relief pipeline (1) is provided with a discharge pipeline (3), and a plurality of connection points are provided on the discharge pipeline (3), which is connected with the relief bypass (2) through the connection points.

4. A multi-stage discharge method for a hydrogenation station discharge pipeline, comprising a multi-stage discharge system as claimed in claim 3, characterized in that: The steps include: 1) When the hydrogen refueling station needs to release, the main release pipeline (1) is connected, and the high-pressure hydrogen enters the main release pipeline (1) through the main release pipeline (1) inlet and is discharged through the main release outlet; 2) During the above process, the pressure transmitter (11) monitors the internal pressure of the main relief pipeline (1) in real time. If the internal pressure rises due to excessive relief, the relief amount is reduced to avoid triggering the bursting disc (21); 3) When the internal pressure of the main relief pipeline (1) remains high or decreases slowly, it is determined that the first flame arrester (12) may be blocked and needs to be replaced in time; if the internal pressure of the main relief pipeline (1) is greater than the triggering pressure of the bursting disc (21), the bursting disc (21) with the lowest bursting pressure setting triggers the explosion to open the corresponding relief bypass (2), and the high-pressure hydrogen in the main relief pipeline (1) enters the corresponding relief bypass (2) through the discharge pipeline (3) to reduce the internal pressure of the main relief pipeline (1); 4) If the internal pressure of the main relief pipeline (1) continues to rise, the bursting discs (21) are triggered to burst and open the corresponding relief bypasses (2) in sequence according to the set trigger pressures, and the high-pressure hydrogen in the main relief pipeline (1) enters the corresponding relief bypasses (2) through the discharge pipeline (3). The multiple relief bypasses (2) work simultaneously to reduce the internal pressure of the main relief pipeline (1).

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