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TitleDry petroleum coke gasification in a pilot-scale entrained-flow sasifier and inorganic element partitioning model
AuthorDuchesne, M AORCID logo; Champagne, S; Hughes, R WORCID logo
SourceEnergy & Fuels vol. 31, issue 7, 2017 p. 6658-6669,
Alt SeriesNatural Resources Canada, Contribution Series 20220129
PublisherAmerican Chemical Society (ACS)
Mediapaper; digital; on-line
File formatpdf
Subjectsfossil fuels; petroleum; coke; coal gasification; modelling; models
Illustrationstables; schematic diagrams; plots; histograms
ProgramClean Fossil Fuels
Released2017 06 16
AbstractEntrained-flow gasification has several advantages over competing technologies for converting petroleum coke, a byproduct of oil refining. However, due to the high capital costs and limits of current commercial technology, the economics look favorable only with high natural gas and oil prices, and high CO2 emission penalties. The objective of the current study is to accelerate the development of petroleum coke gasification technologies via dry-feed pressurized entrained-flow gasifier pilot-scale tests with petroleum coke. The results indicate carbon conversion generally increased with higher O:C ratios. Thermodynamic model predictions generally vary by less than 25% from the experimental outlet gas flow rates of the main species, CO and H2. The predicted flow rates for other gases vary much more from experimental values, while the predicted carbon conversion values are similar (±16 percentage points), and the predicted temperatures are mostly lower than experimental values. Mass balances and enrichment factors were calculated for inorganic elements due to their potential environmental and technological impact. In general, results from this study indicate similar or lower volatility for elements when compared to combustion systems. An inorganic element partitioning model is presented and compared to experimental values. Considerations for other types of petroleum coke are also provided.
Summary(Plain Language Summary, not published)
Canada produces approximately four million tonnes of petroleum coke, a by-product of oil refining, each year and has a stockpile approaching 100 million tonnes. Potential uses of this by-product are limited due to its low reactivity, its high sulphur content and the presence of trace metals. Furthermore, the Government of Canada has committed to a CO2 penalty of approximately 37 USD/tonne by 2022, affecting the economics of using carbon-rich feedstocks like petroleum coke. Petroleum coke gasification can be used to generate power and produce various chemicals, while sulphur and CO2 capture is more efficient and less costly with gasification than with conventional combustion processes. Specifically, entrained-flow gasifiers operate at higher temperatures than fixed-bed or fluidised-bed gasifiers, making them suitable for low-reactivity feedstocks and able to capture trace metals in inert slag. The current study fills knowledge gaps regarding petroleum coke gasification technologies by testing with Canadian petroleum coke in a pilot-scale dry-feed pressurized entrained-flow gasifier under a wide range of operating conditions. Particular attention was given to the partitioning of inorganic elements which may have negative environmental and technological impacts.

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