Design standards for the length of copper tubes in oxygen pipeline flame arresters
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The flame arrester installed on the oxygen pipeline is a section of copper tube with no filling inside. What is the design principle behind this type of oxygen flame arrester, and what determines the length of the copper tube? Are there theoretical foundations and calculation methods?
A flame arrester is designed and manufactured based on the principle that a flame is extinguished due to heat loss when it passes through the narrow pores of a heat conductor. An oxygen flame arrester is a flame arrester placed before and after the valve in an oxygen pipeline, fabricated by welding special copper alloys and stainless steel. Most oxygen flame arresters are made of solid materials that contain numerous small, uniform or irregular channels or pores through which gas can pass; these channels or pores need to be as small as possible, only large enough to allow flames to pass through. In this way, once the flame enters the flame arrester, it splits into many small flame streams and is extinguished. The mechanism by which a flame can be extinguished is heat transfer and the wall effect.
The principle of the flame arrester in oxygen delivery pipelines differs from that of ordinary petrochemical pipeline flame arresters. Typically, these flame arresters have an internal filling structure composed of wire mesh or grid-like fillers, which disperses open flames in order to extinguish sparks or flames, thereby preventing ignition at its source. An oxygen delivery flame arrester uses copper or nickel alloy tubes installed behind the valve; it is designed to address the risk of ignition in the pipeline caused by the adiabatic compression that occurs when high-pressure oxygen rushes in once the valve is opened, leading to a rise in temperature. The copper or nickel alloy tubes absorb the heat generated by this compression, thereby preventing ignition.
“”By using copper tubes or nickel alloy tubes to absorb the heat generated by this compression, can you explain this statement? What is the principle behind heat absorption?