Off gas measurements from a plasma arc treatment facility
- Mississippi State Univ., MS (United States)
Off-gas sampling and analysis was performed during plasma arc vitrification materials testing. All sampling was done approximately 30 feet downstream of the plasma torch. Gases were extracted, dried, and analyzed for combustibles, carbon dioxide, carbon monoxide, oxygen, sulfur dioxide, and nitrogen oxides. Particulate sampling was conducted using a US Environmental Protection Agency Method 5 sampling system. Gas analysis data indicated thatlevels of nitrous oxides were high due to air being used as the plasma gas. As briquettes were added to the crucible and pyrolysis began, the levels of nitrous oxides and oxygen in the off-gas decreased. This decrease was accompanied by an increase in the levels of carbon dioxide and carbon monoxide. It was observed that the carbon monoxide levels were directly related to the feed rate of the briquettes. Low levels of sulfur dioxide were detected, probably due to the interference of high levels of nitrous oxides with the analyzer. Particulate sampling rates were higher than isokinetic, which resulted in lower particulate levels measured than actually occurred. It was noted that the majority of the particles were generated when the surrogate feed was rapidly added to the torch vessel. The results of these analyses impact vessel design. Vessels must either be designed to allow sufficient residence time for complete destruction of hazardous materials, feed rates must be maintained below a threshold level, or a secondary combustion device must be used downstream. The vessel and feed system need to be designed to allow introduction of waste material in such a way that significant particulate material is not generated.
- OSTI ID:
- 210557
- Report Number(s):
- CONF-9509139-; TRN: 95:008324-0423
- Resource Relation:
- Conference: 7. ACS special symposium: emerging technologies in hazardous waste management, Atlanta, GA (United States), 17-20 Sep 1995; Other Information: PBD: 1995; Related Information: Is Part Of Emerging technologies in hazardous waste management VII; Tedder, D.W. [ed.]; PB: 1352 p.
- Country of Publication:
- United States
- Language:
- English
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