Sensitive detection device for hydrogen leakage of hydrogen-containing medium pipeline flange

Abstract

A sensitive detection device for hydrogen leakage of a hydrogen-containing medium pipeline flange comprises a pinnacle gas-collecting hood arranged right above the pipeline flange, and the inner wall of the pinnacle gas-collecting hood forms a flow guide space converging towards the top and is used for collecting hydrogen leaked from the pipeline flange and guiding the hydrogen to the top; the hydrogen detection sensor mounted at the top detects the hydrogen concentration of the collected gas in real time; the discharge pipeline is communicated with the pinnacle gas-collecting hood, and the detected gas is safely discharged to avoid local accumulation; the control system is electrically connected with the sensor through a cable and receives concentration signals in real time. According to the device, leaked gas is naturally converged through the pinnacle gas collection structure by using hydrogen density difference, the gas concentration of a sensor detection area is improved, the gas is safely discharged through a discharge pipeline after being detected by a sensor, and a control system can quickly give an early warning when the hydrogen concentration exceeds a threshold value. The device solves the problem of insufficient hydrogen detection sensitivity in an open environment, has the advantages of simple structure, quick response, safety and reliability, is suitable for hydrogen leakage monitoring in industrial fields such as synthesis ammonia and the like, and effectively guarantees the production safety.

Description

TECHNICAL FIELD

[0001] The utility model relates to synthetic ammonia production safety monitoring technical field especially relates to a hydrogen medium pipeline flange hydrogen leakage sensitive detection device. BACKGROUND

[0002] In the synthetic ammonia industry, hydrogen as the core raw material is transported to the synthesis tower, compressor and other key equipment through the pipeline, after long time use, the pipeline flange connection part is easy to leak hydrogen due to vibration, aging or installation deviation and other factors. The density of hydrogen is only 1 / 14 of air, after leakage, it diffuses upward rapidly, which makes the traditional single-point detector difficult to effectively capture the leakage gas and accurately detect in the open environment, so that the hydrogen leakage of the flange cannot be found in time and timely warning is not provided for the operating personnel, and the safety production is not guaranteed. SUMMARY

[0003] In view of the low hydrogen leakage detection efficiency and insufficient sensitivity in the prior art, the utility model provides a device for realizing accurate detection of leaked hydrogen through structure optimization, which ensures early detection and safety warning of the flange connection part.

[0004] To achieve the above-mentioned purpose, the utility model provides a hydrogen medium pipeline flange hydrogen leakage sensitive detection device, which comprises a sharp-top gas collecting hood, a hydrogen detection sensor, a discharge pipeline and a control system. The sharp-top gas collecting hood is in the shape of an inverted truncated cone and is arranged directly above the pipeline flange to be monitored. The bottom surface has an opening size covering the pipeline flange area to be monitored. The hydrogen detection sensor is installed at the top end of the sharp-top gas collecting hood. The discharge pipeline is arranged at the top of the gas collecting hood and is in communication with the side of the top end of the gas collecting hood at one end and extends to the outdoor at the other end. The control system is connected to the hydrogen detection sensor through a cable and is used for receiving the hydrogen detection sensor signal in real time, presetting the hydrogen concentration alarm threshold and triggering the warning signal when the threshold is exceeded.

[0005] Further, the sharp-top gas collecting hood is installed at a position 200mm above the hydrogen medium pipeline flange by a buckle fixing piece and can be quickly disassembled during maintenance.

[0006] Further, the outlet of the discharge pipeline extends to the outdoor and is provided with a rainproof cap.

[0007] When hydrogen leakage occurs in the pipeline flange, the low-density hydrogen migrates upward under the action of buoyancy and is guided and gathered to the top end of the hood body by the inverted truncated cone structure of the sharp-top gas collecting hood. The hydrogen detection sensor detects the gathered high-concentration gas in real time, and the gas is discharged to the outdoor safely after detection to avoid local accumulation. The control system displays the concentration data in real time and immediately issues a warning when the detection value exceeds the threshold, prompting the operating personnel to check the leakage point.

[0008] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0009] 1. The pointed structure optimizes gas collection efficiency, solves the problem of difficult collection of leaked gas in open environments, and guides diffused hydrogen to the top to collect, increasing the gas concentration in the sensor detection area by 3-5 times and significantly improving detection sensitivity.

[0010] 2. The emission pipeline design avoids localized hydrogen accumulation, ensuring safety and reliability;

[0011] 3. The detection device has a simple overall structure, low installation space requirements, low operation and maintenance costs, and is easy to maintain.

[0012] 4. The control system supports 4-20mA signal output and RS485 communication to realize multi-terminal alarm and real-time early warning. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the configuration of the device of this utility model;

[0014] Legend: 1. Pointed gas collection hood; 2. Hydrogen detection sensor; 3. Discharge pipeline; 4. Control system; 5. Pipe flange; 6. Hydrogen-containing medium pipeline; 7. Clip-on bracket; 8. Rain cap. Detailed Implementation

[0015] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0016] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification. Example

[0017] like Figure 1 As shown, a pointed gas collection hood (1) is installed 200 mm directly above the flange (5) of the hydrogen-containing medium pipeline using a snap-fit ​​bracket (7) to ensure that the hood completely covers the area above the flange. A hydrogen detection sensor (2) is installed on the top of the gas collection hood and connected to the control system (4) via a cable. An exhaust pipeline (3) is connected to the top of the gas collection hood, with the pipeline outlet extending to a well-ventilated outdoor area and fitted with a rain cap (8).

[0018] When a flange leaks, hydrogen gas accumulates along the inner wall of the enclosure towards the top. Sensors detect this in real time and transmit signals to the control system. When the detected hydrogen concentration exceeds a preset threshold, the control system immediately issues an alarm and sends the leak location and concentration data to the central control room. The detected gas is discharged through the exhaust pipeline to prevent it from remaining inside the enclosure.

[0019] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A sensitive detection device for hydrogen leakage in a pipeline flange containing hydrogen media, characterized in that: The system includes a pointed gas collection hood (1), a hydrogen detection sensor (2), an emission pipeline (3), and a control system (4). The pointed gas collection hood (1) is located directly above the flange (5) of the pipeline to be monitored, and the bottom opening covers the area of ​​the flange to be monitored. The pointed gas collection hood is fixed to the pipeline flange by a snap-on bracket (7) and can be quickly disassembled during maintenance. The hydrogen detection sensor (2) is installed on the top of the pointed gas collection hood (1). The emission pipeline (3) is located on the top of the gas collection hood, with one end connected to the side of the top of the gas collection hood and the other end extending to the outside. The control system (4) is connected to the hydrogen detection sensor (2) via a cable and is used to receive the signal from the hydrogen detection sensor (2) in real time, preset the hydrogen concentration alarm threshold, and trigger an alarm signal when the threshold is exceeded.

2. The sensitive detection device for hydrogen leakage in a hydrogen-containing medium pipeline flange according to claim 1, characterized in that: The pointed gas collection hood (1) is in the shape of an inverted frustum.

3. A sensitive detection device for hydrogen leakage in a hydrogen-containing medium pipeline flange according to claim 1 or 2, characterized in that: The pointed gas collection hood (1) is installed 200mm directly above the flange (5) of the hydrogen-containing medium pipeline by means of a snap fastener.

4. The hydrogen leakage sensitive detection device for a hydrogen-containing medium pipeline flange according to claim 1, characterized in that: The outlet of the discharge pipeline (3) extends outdoors and is fitted with a rain cap (8).

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