Experimental study of carbon monoxide for woods under spontaneous ignition condition

► We investigated CO release rate and CO yield of wood samples by spontaneous ignition. ► A model predicted CO yield of wood under heat flux and moisture content was developed. ► Woods' thickness show little effect to the peak CO release rate. ► Decrease of peak CO release rate is not obvious as heat flux is higher than 50 kW/m2. ► Moisture reduces CO release rate and postpones time to peak CO release rate.