A fire extinguishing system at the flange connection of a hydrogen pipeline

Abstract

The invention belongs to the field of safety production, and in particular relates to a fire extinguishing system at a flange connection of a hydrogen pipeline. The system comprises: a nitrogen injection device for injecting nitrogen to the flange connection along the radial direction of the flange; Fire-fighting foam spraying device for spraying fire-fighting foam to flange joint; temperature monitoring device for monitoring temperature above flange joint; and control device for monitoring temperature of said temperature monitoring device>preset Control the nitrogen injection device and / or the fire-fighting foam injection device to open if the value is set. The system provided by the invention can monitor and automatically extinguish the hydrogen leakage and fire at the flange connection in real time, and the system is matched with dual extinguishing agents (nitrogen, fire-fighting foam), which can provide double protection for extinguishing and improve the success rate of extinguishing.

Description

technical field [0001] The invention belongs to the field of safe production, and in particular relates to a fire extinguishing system for a hydrogen pipeline flange joint. Background technique [0002] The transportation of hydrogen in the refinery unit is limited by the physical properties of hydrogen (critical temperature -234.8°C, critical pressure 1664.8kPa), and large-scale use can only be carried out by pipeline. Because the reaction conditions required by the hydrogenation reaction are generally high, ordinary pipelines cannot withstand the high pressure state, so the current hydrogen pipelines in the refinery are mostly made of metal, and due to the requirements of the production process, welding valves cannot be used at the joints of the pipelines, so only The form of valve and flange connection is adopted, which leads to irregular installation or long-term use, and hydrogen leakage is very easy to occur at the flange connection. [0003] After the hydrogen gas le...

AI Technical Summary

Problems solved by technology

Because the reaction conditions required by the hydrogenation reaction are generally high, ordinary pipelines cannot withstand the high pressure state, so the current hydrogen pipelines in the refinery are mostly made of metal, and due to the requirements of the production process, welding valves cannot be used at the joints of the pipelines, so only The form of valve and flange connection is adopted, which leads to irregular installation or long-term use, and hydrogen leakage is very easy to occur at the flange connection

[0003] After the hydrogen gas leaks, the high-speed outflowing hydrogen gas will rub against the pipeline to generate static electricity. Since hydrogen gas is an extremely flammable gas, the static electrodes generated by friction can easily ignite the hydrogen gas, causing the hydrogen gas to leak and catch fire.

Moreover, since the flame of hydrogen combustion is light blue, it is not easy to be detected by the naked eye under sunlight, which leads to the failure of timely extinguishment of hydrogen leakage and fire, resulting in irreversible safety accidents

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