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Title: Development of advanced hot-gas desulfurization processes

Abstract

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 {micro}m average particle size (aps) zinc-based mixed-metal oxide sorbent for removing H{sub 2}S 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 SO{sub 2} containing regeneration tail-gas. Direct Sulfur Recovery Process (DSRP), a leading first generation technology, efficiently reduces this SO{sub 2} 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: optimized low-cost sorbent materials with 70-80more » {micro}m average aps meeting all Sierra specs; attrition resistant sorbents with 170 {micro}m aps that allow greater flexibility in the choice of the type of fluidized-bed reactor e.g. they allow increased throughput in a bubbling-bed reactor; and modified fluidizable sorbent materials that can be regenerated to produce elemental sulfur directly with minimal or no use of coal gas. The effort during the reporting period has been devoted to development of optimized low-cost zinc-oxide-based sorbents for Sierra-Pacific. The sorbent surface were modified to prevent sintering during pure air regeneration. Modifications were made to the sorbent to increase its ability to withstand high temperature and prevent loss of capacity by utilizing various textural promoters. Also several modified zinc-based sorbents prepared that can be regenerated to produce elemental sulfur directly with minimal use of coal gas.« less

Authors:
Publication Date:
Research Org.:
Federal Energy Technology Center Morgantown (FETC-MGN), Morgantown, WV (United States); Federal Energy Technology Center Pittsburgh (FETC-PGH), Pittsburgh, PA (United States)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
773441
Report Number(s):
FG26-97FT97276-03
TRN: AH200106%%111
DOE Contract Number:  
FG26-97FT97276
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 26 Apr 1999
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL GAS; COMBINED CYCLES; DESULFURIZATION; FLUIDIZED BED REACTORS; FLUIDIZED BEDS; PARTICLE SIZE; POWER PLANTS

Citation Formats

Jothimurugesan, K. Development of advanced hot-gas desulfurization processes. United States: N. p., 1999. Web. doi:10.2172/773441.
Jothimurugesan, K. Development of advanced hot-gas desulfurization processes. United States. https://doi.org/10.2172/773441
Jothimurugesan, K. 1999. "Development of advanced hot-gas desulfurization processes". United States. https://doi.org/10.2172/773441. https://www.osti.gov/servlets/purl/773441.
@article{osti_773441,
title = {Development of advanced hot-gas desulfurization processes},
author = {Jothimurugesan, K},
abstractNote = {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 {micro}m average particle size (aps) zinc-based mixed-metal oxide sorbent for removing H{sub 2}S 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 SO{sub 2} containing regeneration tail-gas. Direct Sulfur Recovery Process (DSRP), a leading first generation technology, efficiently reduces this SO{sub 2} 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: optimized low-cost sorbent materials with 70-80 {micro}m average aps meeting all Sierra specs; attrition resistant sorbents with 170 {micro}m aps that allow greater flexibility in the choice of the type of fluidized-bed reactor e.g. they allow increased throughput in a bubbling-bed reactor; and modified fluidizable sorbent materials that can be regenerated to produce elemental sulfur directly with minimal or no use of coal gas. The effort during the reporting period has been devoted to development of optimized low-cost zinc-oxide-based sorbents for Sierra-Pacific. The sorbent surface were modified to prevent sintering during pure air regeneration. Modifications were made to the sorbent to increase its ability to withstand high temperature and prevent loss of capacity by utilizing various textural promoters. Also several modified zinc-based sorbents prepared that can be regenerated to produce elemental sulfur directly with minimal use of coal gas.},
doi = {10.2172/773441},
url = {https://www.osti.gov/biblio/773441}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Apr 26 00:00:00 EDT 1999},
month = {Mon Apr 26 00:00:00 EDT 1999}
}