Removal of carbon dioxide in closed loop off-gas treatment systems
- Argonne National Lab., IL (United States)
A combustor with a closed loop off-gas recirculation system has been constructed to demonstrate a gas treatment and purification system that can be installed on hazardous and mixed-waste incineration and vitrification equipment to virtually eliminate the potential for release of hazardous or radioactive materials to the environment. In initial tests, a 250,000 BTU/h (75 kW thermal) combustor was operated in an open loop to demonstrate the removal of combustion product CO{sub 2} in a fluidized bed of CaO (lime), and particulates were removed with hot gas candle filters. An absorbent solution treatment (AST) process is now being developed for removal of CO{sub 2} from a side loop. High CO{sub 2} concentrations can be maintained in the recirculating gases, and this improves the performance of commercially available processes used to purify gases and produce CO{sub 2}. Incineration systems with closed loopoff-gas treatment can have a high throughput and accommodate more hazardous and more radioactive waste streams than what would be possible with a conventional incinerator. With the AST process, CO{sub 2} and water vapor go through two changes of state before release, effectively separating these combustion products from contaminants released during incineration or vitrification. Oxygen is added to support combustion, and solids are separated by precipitation and filtration. 18 refs., 9 figs.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 381793
- Journal Information:
- Journal of Environmental Science and Health, Part A: Environmental Science and Engineering, Vol. 31, Issue 7; Other Information: PBD: Aug 1996
- Country of Publication:
- United States
- Language:
- English
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