Hanford Waste Vitrification Plant full-scale feed preparation testing with water and process simulant slurries

Gaskill, J.R.; Larson, D.E.; Abrigo, G.P.

doi:10.2172/560886

Cited by 2 publications

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“…Interestingly, line plugging was observed in melter feed transport tests in support of the Hanford Waste Vitrification Plant (HWVP; Gaskill et al 1996). Glass frit in the size range of 80 to 200 mesh (i.e., 75 to 180 m) were added to a neutralized current acid waste (NCAW) simulant to form the melter feed.…”

Section: 8mentioning

confidence: 99%

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Deposition Velocities of Newtonian and Non-Newtonian Slurries in Pipelines

Poloski

Adkins

Abrefah

et al. 2009

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Executive SummaryThe External Flowsheet Review Team (EFRT) expressed concern about the potential for Waste Treatment and Immobilization Plant (WTP) pipe plugging. Per the review's executive summary, "Piping that transports slurries will plug unless it is properly designed to minimize this risk. This design approach has not been followed consistently, which will lead to frequent shutdowns due to line plugging." To evaluate the potential for plugging, critical-velocity tests were performed on several physical simulants to determine if the design approach is conservative. Critical velocity is defined as the point where particles begin to deposit to form a moving bed of particles on the bottom of a straight horizontal pipe during slurry transport operations. The critical velocity depends on the physical properties of the particles, fluid, and system geometry.This report gives the results from critical-velocity testing and provides an indication of slurry stability as a function of fluid rheological properties and transport conditions that are typical of what the plant will see. The experimental results are compared to the WTP design guide on slurry-transport velocity in an effort to confirm minimum waste-velocity and flushing-velocity requirements as established by calculations and critical-velocity correlations in the design guide. The major findings of this testing are as follows:Experimental results indicate that for Newtonian fluids, the design guide is conservative. The design guide is based on the Oroskar and Turian (1980) correlation, a traditional industry-derived equation that focuses on particles larger than 100 m in size. Slurry viscosity has a greater effect on particles with a larger surface area to mass ratio, i.e. smaller particles. The increased viscous forces on small particles result in a smaller critical velocities. Since the Hanford slurry particles generally have large surface area to mass ratios, the reliance on such equations in the 24590-WTP-GPG-M-0058, Rev 0 design guide (Hall 2006) is conservative. Additionally, the use of the 95% percentile particle size as an input to this equation is conservative. The design guide specifies the use of the d 95 density, this term is ambiguous and needs clarification in the design guide. Nonetheless, this value is interpreted to mean the density of the d 95 particle. This density value is irrelevant for critical velocity calculations. Often this value is unknown, and Equation 1 of the 24590-WTP-GPG-M-0058, Rev 0 design guide (Hall 2006) will be used for design purposes. This equation calculates an average or composite density of all solids in the slurry. However, test results indicate that the use of an average particle density as an input to the equation is not conservative. Particle density has a large influence on the overall critical-velocity result returned by the correlation. The viscosity correlation used in the WTP design guide has been shown to be inaccurate for Hanford waste feed materials. Additionally, the recommendation of a 30% minimum margi...

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Section: 8mentioning

confidence: 99%

“…Consequently, this slurry would be considered homogeneous and non-settling. However, the following observation was made by Gaskill et al (1996):…”

Section: 8mentioning

confidence: 99%

Deposition Velocities of Newtonian and Non-Newtonian Slurries in Pipelines

Poloski

Adkins

Abrefah

et al. 2009

View full text Add to dashboard Cite

show abstract

“…Interestingly, line plugging was observed in melter-feed transport tests in support of the Hanford Waste Vitrification Plant (HWVP; Gaskill et al 1996). Glass frit in the size range of 80 -200 mesh (i.e., 75 to 180 m) was added to a neutralized current acid waste (NCAW) simulant to form the melter feed.…”

Section: There Should No Longer Be Any Debate About (I) the Fact Thatmentioning

confidence: 99%

“…The resulting melter feed was characterized as a Bingham plastic with a yield stress of 25 Pa. A 10-mm glass particle should be suspended in this fluid according to typical yield-stability parameter tests. However, Gaskill et al (1996) made the following observation:…”

Section: There Should No Longer Be Any Debate About (I) the Fact Thatmentioning

confidence: 99%

Deposition Velocities of Non-Newtonian Slurries in Pipelines: Complex Simulant Testing

Poloski¹,

Bonebrake²,

Casella³

et al. 2009

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Hanford Waste Vitrification Plant full-scale feed preparation testing with water and process simulant slurries

Cited by 2 publications

References 0 publications

Deposition Velocities of Newtonian and Non-Newtonian Slurries in Pipelines

Deposition Velocities of Newtonian and Non-Newtonian Slurries in Pipelines

Deposition Velocities of Non-Newtonian Slurries in Pipelines: Complex Simulant Testing

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