Enhanced durability of desulfurization sorbents for fluidized-bed applications
Abstract
Advanced integrated gasification combined cycle (IGCC) power systems require the development of high-temperature desulfurization sorbents capable of removing hydrogen sulfide from coal gasifier down to very low levels. The objective of this investigation was to identify and demonstrate methods for enhancing the long-term chemical reactivity and mechanical strength of zinc ferrite, a leading regenerable sorbent, for fluidized-bed applications. Fluidized sorbent beds offer significant potential in IGCC systems because of their ability to control the highly exothermic regeneration involved. However, fluidized beds require a durable, attrition-resistant sorbent in the 100--300 {mu}m size range. A bench-scale high-temperature, high- pressure (HTHP) fluidized-bed reactor (7.6-cm I.D.) system capable of operating up to 24 atm and 800{degree}C was designed, built and tested. A total of 175 sulfidation-regeneration cycles were carried out using KRW-type coal gas with various zinc ferrite formulations. A number of sorbent manufacturing techniques including spray drying, impregnation, crushing and screening, and granulation were investigated. While fluidizable sorbents prepared by crushing durable pellets and screening had acceptable sulfur capacity, they underwent excessive attrition during multicycle testing. The sorbent formulations prepared by a proprietary technique were found to have excellent attrition resistance and acceptable chemical reactivity during multicycle testing. However, zinc ferrite was foundmore »
- Authors:
- Publication Date:
- Research Org.:
- Research Triangle Inst., Research Triangle Park, NC (United States)
- Sponsoring Org.:
- USDOE, Washington, DC (United States)
- OSTI Identifier:
- 10102249
- Report Number(s):
- DOE/MC/25006-3011
ON: DE91002090
- DOE Contract Number:
- AC21-88MC25006
- Resource Type:
- Technical Report
- Resource Relation:
- Other Information: PBD: Jun 1991
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 01 COAL, LIGNITE, AND PEAT; 20 FOSSIL-FUELED POWER PLANTS; HYDROGEN SULFIDES; REMOVAL; ZINC COMPOUNDS; SORPTIVE PROPERTIES; IRON COMPOUNDS; SORBENT INJECTION PROCESSES; FLUIDIZED BEDS; HOT GAS CLEANUP; DESULFURIZATION; COAL GASIFICATION; FLUIDIZED-BED COMBUSTORS; BENCH-SCALE EXPERIMENTS; REGENERATION; 010404; 010402; 200102; GASIFICATION; PURIFICATION AND UPGRADING; POWER CYCLES
Citation Formats
Gupta, R P, and Gangwal, S K. Enhanced durability of desulfurization sorbents for fluidized-bed applications. United States: N. p., 1991.
Web. doi:10.2172/10102249.
Gupta, R P, & Gangwal, S K. Enhanced durability of desulfurization sorbents for fluidized-bed applications. United States. https://doi.org/10.2172/10102249
Gupta, R P, and Gangwal, S K. 1991.
"Enhanced durability of desulfurization sorbents for fluidized-bed applications". United States. https://doi.org/10.2172/10102249. https://www.osti.gov/servlets/purl/10102249.
@article{osti_10102249,
title = {Enhanced durability of desulfurization sorbents for fluidized-bed applications},
author = {Gupta, R P and Gangwal, S K},
abstractNote = {Advanced integrated gasification combined cycle (IGCC) power systems require the development of high-temperature desulfurization sorbents capable of removing hydrogen sulfide from coal gasifier down to very low levels. The objective of this investigation was to identify and demonstrate methods for enhancing the long-term chemical reactivity and mechanical strength of zinc ferrite, a leading regenerable sorbent, for fluidized-bed applications. Fluidized sorbent beds offer significant potential in IGCC systems because of their ability to control the highly exothermic regeneration involved. However, fluidized beds require a durable, attrition-resistant sorbent in the 100--300 {mu}m size range. A bench-scale high-temperature, high- pressure (HTHP) fluidized-bed reactor (7.6-cm I.D.) system capable of operating up to 24 atm and 800{degree}C was designed, built and tested. A total of 175 sulfidation-regeneration cycles were carried out using KRW-type coal gas with various zinc ferrite formulations. A number of sorbent manufacturing techniques including spray drying, impregnation, crushing and screening, and granulation were investigated. While fluidizable sorbents prepared by crushing durable pellets and screening had acceptable sulfur capacity, they underwent excessive attrition during multicycle testing. The sorbent formulations prepared by a proprietary technique were found to have excellent attrition resistance and acceptable chemical reactivity during multicycle testing. However, zinc ferrite was found to be limited to 550{degree}C, beyond which excessive sorbent weakening due to chemical transformations, e.g., iron oxide reduction, was observed.},
doi = {10.2172/10102249},
url = {https://www.osti.gov/biblio/10102249},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jun 01 00:00:00 EDT 1991},
month = {Sat Jun 01 00:00:00 EDT 1991}
}