Bench‐scale testing of high‐temperature desulfurization sorbents

Gangwal, S.K.; Harkins, S.M.; Woods, Mark; Jain, Sanchit; Bossart, S.J.

doi:10.1002/ep.3300080421

Cited by 73 publications

(66 citation statements)

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“…Zinc metal evaporation becomes significant if desulfurization above 732 °C (1350 °F) under dry conditions (i.e., low H 2 O content in the coal gas) is desired. 68 Since the GE moving-bed system carries out H 2 S absorption around 482-538 °C (900-1000 °F), zinc metal evaporation is not a concern. When regeneration is carried out under dry conditions in the presence of diluted air, the following reaction takes place: …”

Section: Zinc Titanate Chemistrymentioning

confidence: 99%

Advanced Sorbent Development Program; Development of Sorbents for Moving-Bed and Fluidized-Bed Applications

AYALA¹,

VENKATARAMANI²

1998

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The integrated gasification combined cycle (IGCC) power system using high-temperature coal gas cleanup is one of the most promising advanced technologies for the production of electric power from coal in an environmentally acceptable manner. Unlike conventional low-temperature cleanup systems that require costly heat exchangers, high-temperature coal gas cleanup systems can be operated near 482-538 °C (900-1000 °F) or higher, conditions that are a closer match with the gasifier and turbine components in the IGCC system, thus resulting is a more efficient overall system. GE is developing a moving-bed, high-temperature desulfurization system for the IGCC power cycle in which zinc-based regenerable sorbents are currently being used as desulfurization sorbents. Zinc titanate and other proprietary zinc-based oxides are being considered as sorbents for use in the Clean Coal Technology Demonstration Program at Tampa Electric Co.'s (TECo) Polk Power Station. Under cold startup conditions at TECo, desulfurization and regeneration may be carried out at temperatures as low as 343 °C (650 °F), hence a versatile sorbent is desirable to perform over this wide temperature range. A key to success in the development of high-temperature desulfurization systems is the matching of sorbent properties for the selected process operating conditions, namely, sustainable desulfurization kinetics, high sulfur capacity, and mechanical durability over multiple cycles. Additionally, the sulfur species produced during regeneration of the sorbent must be in a form compatible with sulfur recovery systems, such as sulfuric acid or elemental sulfur processes.The overall objective of this program is to develop regenerable sorbents for hydrogen sulfide removal from coal-derived fuel gases in the temperature range 343-538 °C (650-1000 °F). Two categories of reactor configurations are being considered: moving-bed reactors and fluidized-bed (bubbling and circulating) reactors. In addition, a cost assessment and a market plan for large-scale fabrication of sorbents were developed. As an optional task, long-term bench-scale tests of the best moving-bed sorbents were conducted.Starting from thermodynamic calculations, several metal oxides were identified for potential use as hot gas cleanup sorbents using constructed phase stability diagrams and laboratory screening of various mixed-metal oxide formulations. Modified zinc titanates and other proprietary metal oxide formulations were evaluated at the bench scale and many of them found to be acceptable for operation in the target desulfurization temperature range of 370 °C (700 °F) to 538 °C (1000 °F) and regeneration temperatures up to 760 °C (1400 °F). Further work is still needed to reduce the batch-to-batch repeatability in the fabrication of modified zinc titanates for larger scale applications.The information presented in this Volume 1 report contains the results of moving-bed sorbent development at General Electric's Corporate Research and Development (GE-CRD). A separate Volume 2 report con...

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Section: Zinc Titanate Chemistrymentioning

confidence: 99%

Advanced Sorbent Development Program; Development of Sorbents for Moving-Bed and Fluidized-Bed Applications

AYALA¹,

VENKATARAMANI²

1998

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“…It is easily regenerated using air/diluent mixtures and has consistently demonstrated H2.S removal down to less than 10 ppmv over multiple cycles (Gangwal et al, 1988;Grindley and Goldsmith, 1987).…”

Section: Zinc Ferrite Processmentioning

confidence: 99%

Enhanced durability of desulfurization sorbents for fluidized-bed applications

Gupta¹,

Gangwal²

1991

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DISCLAIMERThis reportwas prepared as sn accountof work_onsored by an agencyof the UnitedStates Government. Neitherthe UnitedStates Governmentnor any agencythereof,norany of their employees, makesany warranty, expressorimplied,_or assumesanylepl'liabiHty or resportsibility for the s_'uracy, completeness, or usefulnessof ar_yinformation, apparatus, product, or process disclosed, orrepresents thatitsuse wouldnotinfri_/ge privatelyownedrights.Referenoehereinto any r_-xificcommercial product, process, orservingbytradename,trademark, manufactu_r,or otherwisedoes notnecessarily constituteor imply/_;ts endorsement, recommendation, orfavoring by the UnitedStates Government orany agency//thereof. iii ACKNOWLEDGMENTS

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“…45 " 47 Copper chromite (CuCri0 4 ), a material that has the lowest reducibility of all the copper-oxide containing compounds, was specifically developed to address the copper oxide reduction issue. 52 ' 53 Other developments include investigations into manganese and rare earth based materials that are especially suitable for high temperatures.…”

Section: High Temperature Sorbents For Syngas Clean Upmentioning

confidence: 99%