Ignition, explosion protection
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According to the explosion-proof regulations, if no flame can be detected using a flame detector within 10 seconds after the high-energy igniter activates the ignition gun, it is considered an ignition failure, and an MFT must be triggered. May I ask how this 10-second time period is determined? I believe it should be calculated and determined based on the size of the furnace, as well as the properties of the fuel and its explosive limit. What do you all think?
It is described in detail in FSSS; I think it is also related to the flame detection characteristics.
The high-energy igniter operates on the principle of capacitor energy storage and discharge; it uses the power supply at line frequency to generate a 3000-volt DC high voltage after stepping up the voltage and rectifying it, which is then used to charge the energy storage capacitor. A gas discharge tube is used as the control switching element; the high voltage on the capacitor causes the discharge tube to break down, thereby rapidly discharging energy into the semiconductor electrode and generating a pulsed arc. When an arc is generated, the combustible gas may not reach the ignition concentration, so a certain amount of time must be waited.
In other words, this 10s refers to the time that starts counting once a command is sent to the high-energy igniter. This time period includes the time required to issue a command until a pulsed arc is generated. So how long is this time usually? Last edited by Houses are too expensive on 2009-2-18 10:15]