Characteristics of Ignition Delay B30 and B100 Biodiesel in Burner System with Variation of Blower Damper Opening

The change in fuel B30 to be used for boiler start-up CFB Coal Powerplant resulted in frequent failures on the initial ignition process. This happens because the flame detector as one of the boiler interlock protections works to give a "no flame" signal so that it activates the Master Fuel Trip (MFT) to stop the initial ignition process of the boiler. The flame detector provides a delay ignition tolerance of 3 seconds during the initial ignition process. Previous studies showed that spontaneous combustion occurred at B0, B10, and B30 delayed ignition for 10 and 35 seconds, while B100 failed to ignite. The fuel does not burn because the air and fuel mixture composition occurs outside the flammability limit. To analyze this phenomenon more deeply, a liquid fuel combustion test kit is needed for the burner system which is equipped with air and fuel control facilities, as well as a high-speed camera to measure the delay in fuel ignition in detail. The results of the B30 combustion test with blower damper opening variations of 25, 50, 75 and 100% showed ignition delays sequentially for 0.08, 0.11, 0.08 and 0.07, while for B100 fuel there were ignition delays for 0.10, 0.07, 0.07 and 0.08. This shows that B30 and B100 fuel can be used as the initial ignition of the CFB boiler.