Oxygen valve combustion explosion risk analysis and preventive measures
Analysis of the Causes of Oxygen Valve Combustion
1. Oxygen valve combustion explosion causes analysis of rust, dust, welding slag and pipe inner wall or valve port friction to produce high temperature combustion
This situation is related to the type of impurities, particle size and gas flow rate. Iron powder is easy to burn with oxygen, and the finer the particle size, the lower the ignition point; the faster the gas velocity, the more likely the combustion occurs.
2. There are substances in the pipeline or valves with low-flammability points such as grease and rubber, which ignite at local high temperature.
3. The high temperature generated by adiabatic compression causes combustibles to burn. The front of the valve is 15MPa, the temperature is 20°C, and the valve is 0.1MPa after normal pressure. If the valve block is opened quickly, the oxygen temperature after the valve can be calculated to 553°C according to the adiabatic compression formula, which has reached or exceeded the ignition point of some substances.
4. The reduction of the ignition point of combustibles in high pressure pure oxygen is the cause of the combustion of oxygen pipeline valves. Oxygen pipelines and valves are very dangerous in high-pressure pure oxygen. Tests have shown that ignition detonation can be inversely proportional to the square of pressure, which poses a great threat to oxygen pipelines and valves.
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