The issue with the vent flare
Thread Content
The venting torch on the station is designed to be automatically ignited by a PLC program; when the torch is used for venting, the pressure switch and flow switch installed on the main venting pipeline detect the pressure and flow signals and transmit them to the main PLC in the control box. The PLC then carries out the automatic ignition procedure after performing digital-to-analog conversion, as described. But in reality, experiments have shown that there is always a problem with the inability to achieve automatic ignition. Is it due to excessive pressure and flow, or issues with the detection?
Torches usually require an eternal flame. Following the logic suggested by LZ is correct; however, it is necessary to use an electronic ignition device to first light a small flame (fed with fuel gas separately), and then use this small flame to ignite the main torch flame. If the main torch is tried to be ignited directly with an electronic ignition device, it will not light up
What was said upstairs is completely correct. When the torch is vented, the flow rate is too high, so electronic ignition cannot work
Oh, the torch on the stand has never used automatic ignition. Other stations have used it, but it’s not the case here. It seems there are some unreasonable aspects in this design
Oh, I see. Thanks. I’ll study it carefully when I get back
After detecting flow and pressure, the constant-light burner supplies fuel gas, but ignition still doesn’t work?
If there’s a perpetual light, it can definitely be lit.
It will definitely catch fire; if not, contact the manufacturer. There is a problem with the design.
The impact on the ignition of the flare caused by high flow rates at the pipe outlet should be avoided.
The design is inadequate – there is no ignition mechanism; the manufacturer should be contacted.
All the issues that LZ is concerned about are possible; we have also encountered such situations on site (though rarely). It is recommended that you take the following steps to identify the cause: 1. Perform a small amount of venting and check whether the discharge signal from the PLC is received. If it is, then there is no problem; in that case, check whether the DO output is functioning properly； 2. If the DO is normal, check whether the igniter is firing (the high-voltage igniter itself makes a firing sound). In short, before contacting the manufacturer, try to identify the cause of the fault, so that the instrument manufacturer can provide better service based on that information.