DEVELOPMENT OF ADVANCED HOT-GAS DESULFURIZATION PROCESSES Page: 4 of 43
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EXECUTIVE SUMMARY
This report describes the project "Development of Advanced Hot-Gas Desulfurization
Processes" sponsored by U.S. Department of Energy, National Energy Technology Laboratory
under Grant No: DE-FG26-97FT97276. The work was performed by Hampton University
(prime contractor) with support by Research Triangle Institute as a subcontractor.
Advanced integrated gasification combined cycle (IGCC) power plants nearing
completion, such as Sierra-Pacific, employ a circulating fluidized-bed (transport) reactor hot-
gas desulfurization (HGD) process that uses 70-180 pm average particle size (aps) zinc-based
mixed-metal oxide sorbent for removing H2S from coal gas down to less than 20 ppmv. The
sorbent undergoes cycles of absorption (sulfidation) and air regeneration. The key barrier
issues associated with a fluidized-bed HGD process are chemical degradation, physical
attrition, high regeneration light-off (initiation) temperature, and high cost of the sorbent.
Another inherent complication in all air-regeneration-based HGD processes is the disposal of
the problematic dilute SO2 containing regeneration tail-gas. Direct Sulfur Recovery Process
(DSRP), a leading first generation technology, efficiently reduces this SO2 to desirable
elemental sulfur, but requires the use of 1-3 % of the coal gas, thus resulting in an energy
penalty to the plant. Advanced second-generation processes are under development that can
reduce this energy penalty by modifying the sorbent so that it could be directly regenerated to
elemental sulfur.
The objective of this research is to support the near and long term DOE efforts to
commercialize the IGCC-HGD process technology. Specifically we aim to develop:4
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Jothimurugesan, K. & Gangwal, Santosh K. DEVELOPMENT OF ADVANCED HOT-GAS DESULFURIZATION PROCESSES, report, December 1, 2000; Pittsburgh, Pennsylvania. (https://digital.library.unt.edu/ark:/67531/metadc719070/m1/4/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.