The efficiency and flexibility of the BL gasification process may improve by mixing BL with more energyrich fuels such as pyrolysis oil (PO). To improve understanding of the fuel conversion process, blends of BL and PO were studied in an atmospheric drop tube furnace. Experiments were performed in varying atmosphere (5% and 0% CO2, balanced by N-2), temperature (800-1400 degrees C), particle size (90-200 mu m and 500630 mu m) and blending ratio ( 0%, 20% and 40% of PO in BL on weight basis). Additionally, pine wood was used as a reference fuel containing little alkali. The addition of PO to BL significantly increased the combined yield of CO and H-2 and that of CH4. BL/based fuels showed much lower concentration of tar in syngas than pine wood. Remarkably, the addition of PO in BL further promoted tar reforming in presence of CO2. Unconverted carbon in the gasification residue decreased with increasing fractions of PO. Small fuel particles showed complete conversion at 1000 degrees C but larger particles did not reach complete conversion even at T = 1400 degrees C. (C) 2017 Elsevier Ltd. All rights reserved.