Composite pipeline for hydrogen conveying and hydrogen leakage monitoring method

Abstract

The invention relates to the field of hydrogen conveying pipelines, in particular to a composite pipeline device for hydrogen conveying and capable of monitoring hydrogen leakage in a full-pipeline mode in real time and a method for monitoring hydrogen leakage in the full-pipeline mode. The novel composite pipeline structure for hydrogen conveying comprises a plastic pipeline, a polyurethane foaming layer and a plastic protection layer, and the plastic pipeline, the polyurethane foaming layer and the plastic protection layer are sequentially arranged from inside to outside. The invention also provides a monitoring system formed by arranging sensors at specific positions by using the composite pipeline device, and provides a monitoring method for a real-time hydrogen conveying pipeline, so that real-time full-pipeline monitoring of the hydrogen conveying pipeline is realized. The composite pipeline for hydrogen conveying can effectively prevent hydrogen leakage and diffusion, reduces hydrogen conveying loss caused by leakage, slows down the situation that hydrogen leaks into air, improves the safety coefficient, avoids the situation that a sensor cannot detect the situation due to the fact that hydrogen escape is too fast and the hydrogen concentration is too low, and improves the safety coefficient. And effective monitoring of the whole pipeline is realized.

Description

technical field [0001] The invention relates to the field of the hydrogen delivery pipeline, in particular to a composite pipeline for hydrogen delivery capable of real-time full-line monitoring of hydrogen leakage, and a device and method for full-line monitoring of hydrogen. Background technique [0002] In recent years, hydrogen energy, as a zero-carbon high-efficiency new energy, has become increasingly prominent in the world's energy transition. Major developed countries in the world have introduced policies to strongly support the development of the hydrogen energy industry in recent years. In 2020, my country will clearly include hydrogen energy in the energy category, which indicates an important step in the development of the hydrogen energy industry. [0003] In the hydrogen energy industry chain, the four very important links are hydrogen production, hydrogen storage, hydrogen transportation and hydrogen utilization. Among them, hydrogen transportation (hydrogen ...

AI Technical Summary

Problems solved by technology

In addition, Monel alloy is used to produce hydrogen pipelines, which have excellent physical properties of high strength, high corrosion resistance, and wear resistance, but for long-distance hydrogen transmission, the technology of using Monel alloy pipelines is complicated and the cost is too high. high, difficult to mass-produce

[0005] Due to the small size of hydrogen gas molecules, the diffusion speed of hydrogen gas is extremely fast, and it is odorless, colorless, and tasteless. The explosion limit range is extremely wide (4% to 75.6%), and the minimum ignition energy of hydrogen gas is only 0.017mJ. Therefore, pipelines are used to transport hydrogen gas At present, there are the following problems: the diffusion loss of hydrogen at the pipeline connection, the current diffusion loss of hydrogen is about three times that of natural gas; due to the high purity required for hydrogen transportation, it is not suitable to add other gases to make the transport gas visible and audible. Once hydrogen leaks, it will dissipate quickly when it enters the air directly from the leak point, which will easily lead to the situation that the concentration is too low to be monitored by the sensor, and it is difficult to be quickly detected and repaired by the staff; the lower explosion limit of hydrogen is low, and the leakage It is easy to form an explosive mixture in the air, and it is easy to burn and explode in case of open flame, high temperature and high heat

[0007] However, there are certain barriers to each technology

Commonly used non-destructive testing techniques include ultrasonic testing, X or γ-ray testing, magnetic particle testing, and penetrant testing, etc. These testing methods cannot monitor in real time and cannot determine the specific location of defects. The detection has potential safety hazards and high detection cost. Magnetic particle detection is only suitable for steel pipelines, etc.; commonly used state monitoring technologies include monitoring technologies for state parameters such as temperature, pressure, and flow. These monitoring technologies can be monitored in real time, but the detection accuracy will vary with time. Depending on the equipment, it is difficult to achieve the detection accuracy of a small amount of hydrogen leakage; leakage monitoring can be realized by arranging gas sensors on the ground, but this method can only be monitored at fixed points, and hydrogen has the characteristics of fast diffusion, so the leakage of hydrogen diffusion If the final concentration is too low, it is difficult for the sensor to achieve such a high sensitivity, and thus cannot be detected in time

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