Influencing factors in choosing the type of flame arrester

The flame first spreads to the pipe wall, and the transmission speed of the flame in the pipeline filled with combustible gas varies greatly with the transmission of the flame. If one end of a horizontal pipe filled with combustible gas is ignited, then it is quickly transmitted to the unignited gas. The heat generated by the combustion causes the combustion gas to expand rapidly, and the gas expansion causes the front end of the combustible gas to be compressed, causing a "pressure rise" phenomenon. The gas at the front of the flame is compressed, the density increases, the combustion transmission speed increases, and the heat generated during combustion increases, resulting in a more intense pressure rise at the front of the combustible gas.” Due to the characteristic of flame propagation in the pipe, the flame transmission speed can be reduced from zero Accelerating to the speed of sound or even supersonic speed, the front pressure of the flame can also increase to about 20MPa. Therefore, the distance between the fire source and the flame arrester has a great influence on the choice of the flame arrester. If the flame arrester is far away from the fire source, then the combustion will be certain The acceleration distance may change from deflagration to detonation. The increase in the pressure at the front of the flame puts forward more stringent requirements on the pressure resistance of the flame retardant element. Products of different manufacturers may be different.

     Under the same working conditions, for the same kind of combustible gas, the choice of flame arrester manufacturing strength and flame arrest time will be very different just because of the different device positions. Therefore, when selecting an online flame arrestor, pay great attention to the influence of the device position. When the process conditions are met, it should be as close to the fire source as possible to reduce the manufacturing requirements of the flame arrestor and improve the economy while ensuring safety. Sex.

     It will play a role in preventing flame transmission under certain conditions. However, the appropriate choice of flame arrestor. Each flame arrestor has its specific working range, which can only play a role in safety maintenance under certain conditions. It is not capable of stopping the flame under any circumstances. It can only be used for MESG values greater than The value of the gas is communicated. Each type of flame arrester should be marked with the size of the passage of its flame arrestor. Otherwise, it will completely fail; each type of flame arrester has a certain flame arrest time under specific conditions. When the flame end burning time exceeds its flame arrest time, The flame arrestor will also fail; for the selection of in-line flame arresters, more attention should be paid to the selection changes caused by the different location of the device, otherwise it may cause hidden safety hazards due to unexpected effects. In summary, in the selection process of the flame arrestor, while calculating the MESG value according to the specification, we must also pay great attention to the various factors that affect the selection. According to the actual working conditions, determine the appropriate flame arrestor. Only in this way can we achieve both guarantees. Safe and economical purpose.