Scaling Theory for Pulsed Jet Mixed Vessels, Sparging, and Cyclic Feed Transport Systems for Slurries

Kuhn, W.L.; Rector, David R.; Rassat, Scot D.; Enderlin, Carl W.; Minette, Michael J.; Bamberger, Judith Ann; Josephson, Gary B.; Wells, Beric E.; Berglin, Eric J.

doi:10.2172/1096126

Cited by 4 publications

(21 citation statements)

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“…The results presented in this section suggest that slurry motion due to the operation of an air sparger may be enhanced in the presence of sufficient quantities (not defined) of retained gas bubbles. Therefore, it may be conservative to neglect retained gas in developing and scaling air-sparger systems (e.g., Kuhn et al 2013). Air Sparger…”

Section: Preliminary Technical Results For Planning -Not To Be Used Fmentioning

confidence: 99%

Hydrogen Gas Retention and Release from WTP Vessels: Summary of Preliminary Studies

Gauglitz

Bontha

Daniel

et al. 2015

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 What is an appropriate mixing metric/requirement that corresponds to adequate gas release and can this requirement be used as an alternative to conducting gas release testing? Do the simulants used in previous gas release testing adequately represent actual waste at plant conditions and what is the most suitable simulant for any planned gas release testing? What is the quantity of hydrogen that could be retained and released during normal, abnormal, and post-design-basis event operations for a range of imperfect mixing conditions (i.e., how much margin is allowed in targeting complete bottom clearing and complete vessel motion)? What is the quantity of hydrogen that can be retained and released in low-solids vessels? What is the margin in the current hydrogen generation rate estimates?Specific test and analysis objectives were identified for each of these questions and subsequently documented in a test plan; however, no technical activities were completed under the test plan for addressing these technical questions. iv S.2 Results and Performance Against Success CriteriaSuccess criteria were developed for each testing and analysis objective and documented in the project test plan; however, no technical activities were completed on the objectives under the test plan. Accordingly, no results are available to compare against the success criteria.

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Section: Preliminary Technical Results For Planning -Not To Be Used Fmentioning

confidence: 99%

Hydrogen Gas Retention and Release from WTP Vessels: Summary of Preliminary Studies

Gauglitz

Bontha

Daniel

et al. 2015

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“…-5.19 for the KB slurry in the 12.75 ft vessel (red dashed). These fits are for the higher velocities reported (Bamberger et al 2005) (>10 m/s in the 2.82 ft vessel and >6 m/s in the 12.75 ft vessel) as slow velocities (in grey solid symbols) may represent a different flow 1 Tests with only two PJMs were also performed, which should induce a planar fan jet along the vessel centerline with scaled velocity decreasing with scaled elevation to the -1/2 power (Rajaratnam 1976) as anticipated by Kuhn et al (2013). Such analysis may be relevant when only two PJMs are operational in the WTP Pretreatment Facility.…”

Section: Analysis Of Historical Centerline Velocity Datamentioning

confidence: 86%

“…Yet, when the flows of impinging nozzles collide, the physics that govern the central upwell has received considerably less attention. Kuhn et al (2013) considered how a pair of impinging jets might interact to form a planar upwell and also suggested that the central upwell may be described as a free jet with a velocity that decays with elevation. How the central upwell is affected by multiple PJMs, significant multicomponent solids loadings, and generalized Newtonian or non-Newtonian rheologies remains unexplored from a jet physics perspective.…”

Section: 2mentioning

confidence: 99%

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Implications of Upwells as Hydrodynamic Jets in a Pulse Jet Mixed System

Pease

Bamberger

Minette

2015

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Resolution of NCR OTS-03616 Rev. 2 produced small changes for the four-part simulant, which affects Tables 2.4, 3.3, and 7.2, Figures 2.13e, 2.14ab, 3.1, 7.3e, and 7.4, and one text entry (p2.27). W replaces Al 2 O 3 in multipart simulant composition in Tables 2.2, 2.4, 3.2, 3.3, and 7.2. Report conclusions were not affected. vii surface flow has been achieved until the end of the PJM pulse, in other parts of the vessel (below seam, 18%; wall upwell, typically <15%), and due to the leading vortex (a measurement opportunity in the 16 ft vessel with radially distributed velocity probes).

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“…In general, a height-averaged gas velocity is used to account for the changes in gas velocity with elevation in the tube/vessel. Chisti et al (1989) present an expression to calculate the height-averaged U * gr , which is recast in terms of variables used in this report (see also Kuhn et al 2013) and is limited to gas flow from the air distributor to the top of the riser tube (where velocity measurements were made):…”

Section: Comparison With Literature Predictionsmentioning

confidence: 99%

Scoping Study of Airlift Circulation Technologies for Supplemental Mixing in Pulse Jet Mixed Vessels

Schonewill¹,

Berglin²,

Boeringa³

et al. 2015

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At the request of the U.S. Department of Energy Office of River Protection, Pacific Northwest National Laboratory (PNNL) conducted a scoping study to investigate supplemental technologies for supplying vertical fluid motion and enhanced mixing in Waste Treatment and Immobilization Plant (WTP) vessels designed for high solids processing. The study assumed that the pulse jet mixers adequately mix and shear the bottom portion of a vessel. Given that, the primary function of a supplemental technology should be to provide mixing and shearing in the upper region of a vessel. The objective of the study was to recommend a mixing technology and configuration that could be implemented in the 8-ft test vessel located at Mid-Columbia Engineering (MCE). Several mixing technologies, primarily airlift circulator (ALC) systems, were evaluated in the study, first by reviewing the available literature and then performing tests with a simple Newtonian simulant (water and glass beads). The experimental study was performed in a 90-in. diameter tank with a maximum liquid operating level of ~108 in. The initial testing evaluated the ability of ALC configurations to lift, transport, and distribute solid particles to near-surface locations in the test vessel. This testing established that ALCs generated significant liquid flows (several hundred gallons per minute) at air flow rates of 5 to 20 standard cubic feet per minute (scfm), and solid particles were readily transported up the riser tube at air flow rates as low as ~5 scfm. The principal outcome of the Newtonian testing was that candidate ALC systems were identified and recommended for testing in a non-Newtonian fluid. The candidate ALC system had the following features: a nominally 10-in. riser tube diameter, 5-ft riser tube length, positioned 5 in. off the tank floor, and an air distributor centrally located at the bottom of the riser tube (tube inlet). An alternative technology, a Geyser Hybrid Pump (GHP), was also identified as a possible candidate. Both of the recommended systems were confirmed to be capable of lifting and dispersing very large solid particles up to approximately 6 mm in size.The non-Newtonian testing was conducted to determine if the recommended ALC configuration from the Newtonian testing was also suitable for mobilizing a Bingham plastic fluid (clay slurry). It was found that mobilizing a yield-stress fluid (initially, the simulant had Bingham parameters of ~22-Pa yield stress and ~34-cP consistency) in the upper region of the vessel required more mixing energy than transporting solid particles in a Newtonian fluid; the 10-in. diameter ALC did not mobilize fluid out to the tank wall in the upper region of the vessel. The GHP was also tested and found to be an improvement over the 10-in. ALC. Some alternatives to the initially recommended ALC were briefly investigated, including testing with a larger diameter ALC and devices that could supply a periodic burst of pressurized air. ALC devices that incorporated pulses of air were demonstrated in proof-of-princip...

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Scaling Theory for Pulsed Jet Mixed Vessels, Sparging, and Cyclic Feed Transport Systems for Slurries

Cited by 4 publications

References 0 publications

Hydrogen Gas Retention and Release from WTP Vessels: Summary of Preliminary Studies

Hydrogen Gas Retention and Release from WTP Vessels: Summary of Preliminary Studies

Implications of Upwells as Hydrodynamic Jets in a Pulse Jet Mixed System

Scoping Study of Airlift Circulation Technologies for Supplemental Mixing in Pulse Jet Mixed Vessels

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