Conversion of high carbon refinery by-products. Quarterly report, July 1--September 30, 1996 Page: 4 of 11
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temperature followed by introducing the oxidant. Within a short period, the bed
temperature reached a peak value and then stabilized or decreased gradually.
At temperatures close to 2000*F, a CO/CO2 molar ratio of 3.5 in the product gas was
obtained. This shows a great improvement in the gas heating value over that obtained in
the TRTU at temperatures lower than 1750*F, and that a temperature of 2000*F is required
to process petroleum coke to produce a fuel gas of acceptable heating value. Tests on
combined POX and steam gasification and tests with steam gasification only were
performed in the BRU. These results were used to develop a flowsheet, and a conceptual
design for the transport reactor is in progress.
Results and Discussion on BRU Tests
Tests were conducted in the BRU using a bed weight of 200 gm of Lyondell/Citgo
petroleum coke with an oxygen concentration range of 15 to 30 vol% in nitrogen over an
initial temperature range of 1800 to 1950*F. The peak bed temperature varied from 2000
to 2100*F. The CO /CO2 ratio was observed to be a function of oxygen partial pressure
and temperature. At 30% 02 concentration and 2000*F, the CO/CO2 ratio was found to be
3.5. This result was the best that was obtained over the temperature range and 02
concentrations investigated. The results from this test are presented in Table 1. The
product gas composition, measured by a GC and infrared analyzers, as a function of time
is shown in Fig. 1. There is good agreement between the GC and the infrared analyzers.
The variation of bed temperature with time is shown in Fig. 2.
It was also determined that the carbon consumption rate by partial oxidation and
gasification by steam is the sum of individual carbon consumption rates obtained in the two
processes. The water gas shift reaction rate was found to be at equilibrium. The
devolatilization of coke could not be studied in the BRU due to equipment limitations, but
was studied in the TRTU at a lower temperature.
Table 1 - Nominal Test Conditions and Results
Operating Temperature, *F 1900
Bed Temperature, "F >2000
Operating Pressure, psig 100
Oxygen Concentration, % 30
CO/CO2 molar ratio in Product Gas 3.5
Steam Gasification Rate, Ib/lb.hr 0.5
A product gas heating value of 124 BTU/scf was estimated for a transport gasifier
with enriched air-blown (30% oxygen) mode of operation utilizing the results obtained in the
BRU and the TRTU.
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Katta, S.; Henningsen, G.; Lin, Y.Y. & Agrawal, R. Conversion of high carbon refinery by-products. Quarterly report, July 1--September 30, 1996, report, October 18, 1996; United States. (https://digital.library.unt.edu/ark:/67531/metadc679592/m1/4/: accessed May 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.