Fire extinguishing system of hydrogen pipeline flange joint

Abstract

The invention belongs to the field of safety production, and particularly relates to a fire extinguishing system of a hydrogen pipeline flange joint. The fire extinguishing system comprises a nitrogeninjection device used for injecting nitrogen to the flange joint in the radial direction of the flange, a fire foam injection device used for injecting fire foam to the flange joint in the radial direction of the flange, a temperature monitoring device used for monitoring the temperature above the flange joint, and a control device used for controlling the nitrogen injection device and / or the fire foam injection device to start when the monitored temperature detected by the temperature monitoring device is greater than a preset value. The fire extinguishing system can monitor and automatically extinguish a hydrogen leakage fire at flange joint in real time. A double-extinguishing agent (nitrogen and fire foam) is matched with the system to use, so that double-protection is provide for fire extinguishing, and the success rate of fire extinguishing is improved.

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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