Stability, Combustion, and Compatibility of High-Viscosity Heavy Fuel Oil Blends with a Fast Pyrolysis Bio-Oil

• Published in: Energy & fuels Vol. 34; no. 7; pp. 8403 - 8413
• Main Authors: Kass, Michael D, Armstrong, Beth L, Kaul, Brian C, Connatser, Raynella Maggie, Lewis, Samuel, Keiser, James R, Jun, Jiheon, Warrington, Gavin, Sulejmanovic, Dino
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 16-07-2020; American Chemical Society (ACS)
• Subjects: 09 BIOMASS FUELS; Aromatic compounds; Biofuels; Biofuels and Biomass; Fossil fuels; Redox reactions; Viscosity
• ISSN: 0887-0624; 1520-5029
• DOI: 10.1021/acs.energyfuels.0c00721

Properties related to the combustion, stability, and compatibility of blends composed of high-viscosity heavy fuel oil (HFO) and highly acidic pyrolysis bio-oil were determined to assess the utility of bio-oil as a marine fuel. The addition of bio-oil was shown to be fully stable with HFO at blend levels up to 50 mass % for up to 2 weeks. Bio-oil concentrations as low as 5 mass % significantly reduced the viscosity of HFO at 25 and 50 °C. Aging studies at 50 and 90 °C showed that the HFO inhibited the polymerization of bio-oil. The heating value and lubricity showed a linear dependency with bio-oil content, and combustion quality was acceptable for blends containing up to 15% bio-oil. The highly acidic bio-oil was found to be corrosive to carbon steel, 2.25Cr-1Mo steel, and 409 stainless steels, but not 304L and 316L. When blended into HFO at levels less than 19 mass %, no measurable corrosion was observed on any of the steel materials, but a 50 mass % concentration produced low-to-moderate corrosion in the carbon steel, 2.25Cr-1Mo steel, and 409 stainless steel grades. The combination of good blend stability, polymerization inhibition, reduced viscosity, and acceptable compatibility for low blend levels suggests that bio-oils may be suitable for use as a marine fuel.