Energy conversion and gas emissions from production and combustion of poultry-litter-derived hydrochar and biochar. (1st March 2018)

• Record Type: Journal Article
• Authors: Mau, Vivian; Gross, Amit
• Is Part Of: Applied energy. Volume 213(2018)
• Page Start: 510
• Page End: 519
• Publication Date: 2018-03-01
• Subjects: Hydrothermal carbonization -- Slow pyrolysis -- Poultry litter -- Combustion -- Greenhouse gases; Power (Mechanics) -- Periodicals; Energy conservation -- Periodicals; Energy conversion -- Periodicals; 621.042
• DOI: 10.1016/j.apenergy.2017.11.033
• Languages: English
• ISSNs: 0306-2619

Abstract

Highlights: 250 °C hydrochar has combustion behavior similar to sub-bituminous coal. HTC results in 24% more net energy generated than slow pyrolysis. Pollutant emissions decreased as HTC production temperature increased. Hydrochar from poultry litter can replace 10% of electricity generated by coal. Abstract: Growing amounts of poultry litter call for improved treatment solutions. Its conversion to renewable energy can offer a solution while concomitantly reducing environmental impact and reliance on fossil fuels. We compared the production and combustion of biochar by slow pyrolysis to that of hydrochar by hydrothermal carbonization (HTC) in terms of char behavior, energetics, and gas emissions. Poultry litter is significantly different from other feedstocks when treated by slow pyrolysis and HTC, and requires a detailed study of its combustion behavior before it can be utilized in large-scale energy generation. Poultry litter was converted to biochar at 450 °C, and to hydrochar at 180, 200, 220 and 250 °C. Their chemical composition, combustion behavior and gaseous emissions were characterized by TGA–FTIR analysis. Hydrochar produced at 250 °C was more energy-dense than biochar, resulting in 24% higher net energy generation. Combustion behavior of hydrochar produced at 180, 200 and 220 °C was similar to that of the original litter, which is typical of biomass. On the other hand, hydrochar produced at 250 °C and biochar were more similar to coal. The main gaseous emissions during char production were CO2, CH4 and H2 S. During the combustion step, NO and SO2 emissions were higher for hydrochar than biochar. Increasing HTC production temperature decreased emissions of CH4 and NH3 during hydrochar combustion. Biochar's emissions were more significant during the production step than during combustion, whereas the opposite held true for hydrochar. Thus, HTC was seen to convert poultry litter more efficiently into a solid fuel that can potentially replace 10% of coal in the generation of electricity, thereby significantly reducing greenhouse gas emissions associated with electricity generation and agricultural waste.