Effect of Demineralisation on the Ignition of Brown Coal by Millisecond Laser Pulses

Key Points

• The aim is to analyze how demineralisation affects the ignition properties of brown coal using laser pulses.
• Investigated ignition of brown coal samples with 1-10 ms laser pulses.
• Used a quasi-continuous ytterbium laser YLR-150/1500-QCW-MM-AC at 1070 nm and 1.6 kW.
• Compared energy requirements for ignition before and after demineralisation.
• Demineralisation increases the energy density needed for ignition.
• There is a measurable difference in ignition thresholds before and after demineralisation.