Enhanced durability of desulfurization sorbents for fluidized-bed applications
To extend the operating temperature range and further improve the durability of fluidizable sorbents, zinc titanate, another leading regenerable sorbent, was selected for development in the later part of this project. A number of zinc titanate formulations were prepared in the 50 to 300 {mu}m range using granulation and spray drying methods. Important sorbent preparation variables investigated included zinc to titanium ratio, binder type, binder amount, and various chemical additives such as cobalt and molybdenum. A number of sorbents selected on the basis of screening tests were subjected to bench-scale testing for 10 cycles at high temperature, high pressure (HTHP) conditions using the reactor system designed and constructed during the base program. This reactor system is capable of operation either as a 2.0 in. or 3.0 in. I.D. bubbling bed and is rated up to 20 atm operation at 871{degrees}C. Bench-scale testing variables included sorbent type, temperature (550 to 750{degrees}C), gas type (KRW or Texaco gasifier gas), steam content of coal gas, and fluidizing gas velocity (6 to 15 cm/s). The sorbents prepared by spray drying showed poor performance in terms of attrition resistance and chemical reactivity. On the other hand, the granulation method proved to be very successful. For example, a highly attrition-resistant zinc titanate formulation, ZT-4, prepared by granulation exhibited virtually no zinc loss and demonstrated a constant high reactivity and sulfur capacity over 10 cycles, i.e., approximately a 60 percent capacity utilization, with Texaco gas at 750{degrees}C, 15 cm/s fluidizing velocity and 15 atm pressure. The commercial potential of the granulation method for zinc titanate manufacture was demonstrated by preparing two 80 lb batches of sorbent with zinc to titanium mol ratios of 0.8 and 1.5.
- Research Organization:
- Research Triangle Inst., Research Triangle Park, NC (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC21-88MC25006
- OSTI ID:
- 10130180
- Report Number(s):
- DOE/MC/25006-3271; ON: DE93000247
- Resource Relation:
- Other Information: PBD: Nov 1992
- Country of Publication:
- United States
- Language:
- English
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Enhanced durability of desulfurization sorbents for fluidized-bed applications
Enhanced durability of desulfurization sorbents for fluidized-bed applications
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20 FOSSIL-FUELED POWER PLANTS
COMBINED-CYCLE POWER PLANTS
COAL GASIFICATION
FUEL GAS
DESULFURIZATION
SORBENT INJECTION PROCESSES
TITANATES
CHEMICAL PREPARATION
PERFORMANCE TESTING
HOT GAS CLEANUP
ADSORBENTS
REGENERATION
ZINC COMPOUNDS
FERRITES
FLUIDIZED BEDS
010404
010402
200102
GASIFICATION
PURIFICATION AND UPGRADING
POWER CYCLES