Improved scatter correction model for high attenuation gamma-ray tomography measurements

Spelay, Ryan B.; Hashemi, Seyed Abdolreza; Sanders, R. Sean; Hjertaker, Bjørn Tore

doi:10.1088/1361-6501/abfddf

Cited by 3 publications

(6 citation statements)

References 7 publications

(9 reference statements)

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“…The acquisition time can be a concern given that laboratory slurry tests are usually carried out in recirculating rigs, thus leading to potential change of the properties of the slurry due to particle attrition and temperature rise. A multiple source/detector system was described in [27] based on a system described in [28] and the errors of the system evaluated for water/clay/sand slurries in a 100-mm pipe up to 20% v/v of sand. Further work by the SRC group is given in [29], where they use the gamma-ray technique to assist with correcting ERT for conductivity changes in the carrier fluid.…”

Section: Comparison With Other Imaging Techniquesmentioning

confidence: 99%

Electrical Resistance Tomography Applied to Slurry Flows

Graham¹

2023

Advances in Slurry Technology

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Electrical resistance tomography (ERT) is used to investigate a variety of slurry flow applications including pipe flow, mixing tanks, and thickener feed wells. Transparent liquids such as Carbopol polymer solutions and water are often used to allow for visualization of slurry flows, but ERT can provide data about solids behavior when the liquid phase is transparent or when it is opaque. The state of suspension of solids using ERT is often useful even when the technique is not a primary requirement of a test. The chapter introduces ERT from the point of view of a user in a research environment, but with flow scenarios relevant to industrial applications in mineral processing. Relevant literature concerning slurry flow applications of ERT is reviewed. The basic theory of ERT will be presented together with a discussion of the image reconstruction problem which is a topic of research activity in the slurry transport community. An overview of ERT applications in slurry pipe flow and mixing tanks will be presented. Examples of the application of ERT to pipe flow and tanks will be discussed in detail, including practical experiences with integrating ERT into slurry pipe and tank rigs.

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Section: Comparison With Other Imaging Techniquesmentioning

confidence: 99%

Electrical Resistance Tomography Applied to Slurry Flows

Graham¹

2023

Advances in Slurry Technology

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Section: Introductionmentioning

confidence: 99%

“…Common among the aforementioned subjects is the importance of the spatial concentration of the solids phase within the flow domain—often referred to as the solids concentration distribution—which in horizontal or inclined flows, shows a noticeable asymmetry around the pipe axis. While 2D distributions over the pipe cross‐section can now be measured [ 4,5,10 ] or reasonably well predicted using CFD simulations, [ 11 ] historically, 1D chord‐averaged measurements as illustrated in Figure 1 have been made. A pioneering contribution to the measurement of chord‐averaged concentration profiles c ( y ) for slurry flows, using a traversing nuclear density gauge (see Figure 1), was published in The Canadian Journal of Chemical Engineering more than 50 years ago.…”

Section: Introductionmentioning

confidence: 99%

“…In the area of online monitoring and instrumentation, recent publications describe noninvasive measurements of solids accumulation, and stationary bed formation, [3] inline slurry flow measurements using artificial intelligence tomography, [4] and high-concentration measurements using novel 2D gamma-ray tomography. [5] The importance of process understanding for slurry pipeline process optimization is covered in the excellent review by Pullum et al [6] illustrated in the analysis of oftenoverlooked transient density-waves [7,8] and the application of computational fluid dynamics (CFD) modelling to slurry flows is thoroughly discussed in the review of Messa et al [9] Common among the aforementioned subjects is the importance of the spatial concentration of the solids phase within the flow domain-often referred to as the solids concentration distribution-which in horizontal or inclined flows, shows a noticeable asymmetry around the pipe axis. While 2D distributions over the pipe cross-section can now be measured [4,5,10] or reasonably well predicted using CFD simulations, [11] historically, 1D chord-averaged measurements as illustrated in Figure 1 have been made.…”

Section: Introductionmentioning

confidence: 99%

“…[5] The importance of process understanding for slurry pipeline process optimization is covered in the excellent review by Pullum et al [6] illustrated in the analysis of oftenoverlooked transient density-waves [7,8] and the application of computational fluid dynamics (CFD) modelling to slurry flows is thoroughly discussed in the review of Messa et al [9] Common among the aforementioned subjects is the importance of the spatial concentration of the solids phase within the flow domain-often referred to as the solids concentration distribution-which in horizontal or inclined flows, shows a noticeable asymmetry around the pipe axis. While 2D distributions over the pipe cross-section can now be measured [4,5,10] or reasonably well predicted using CFD simulations, [11] historically, 1D chord-averaged measurements as illustrated in Figure 1 have been made. A pioneering contribution to the measurement of chord-averaged concentration profiles c(y) for slurry flows, using a traversing nuclear density gauge (see Figure 1), was published in The Canadian Journal of Chemical Engineering more than 50 years ago.…”

Section: Introductionmentioning

confidence: 99%

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A multispecies 1D concentration distribution model for coarse‐particle slurries

et al. 2022

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Coarse-particle (settling) slurry pipelines are key process units in many industries. In Canada's oil sands operations, such pipelines represent hundreds of millions of dollars of infrastructure investment and transport thousands of tonnes of solids every hour. The ability to determine key design/operating parameters of a settling slurry, such as frictional pressure gradient and deposition velocity, is dependent on the accuracy of the concentration distribution model used to determine the local concentration of coarse solids as a function of vertical position within the pipe. Accurate predictions of the concentration profile are also required for physics-based models of particle-impact erosion in slurry pipelines. In this study, an improved concentration distribution model was developed. The classic Schmidt-Rouse turbulent diffusion equation forms the basis for the model. The improvements made here include the use of a more suitable, high-concentration hindered settling velocity correlation, and a simple semi-empirical correlation for the particle diffusivity, which is shown to be dependent only upon the terminal particle settling velocity and the Kolmogorov turbulent velocity scale. The model is applicable to slurries with broad size distributions and/or species with different densities. The performance of the model is tested against numerous slurry flow conditions, including particles from 70 μm to 8 mm in diameter, pipe diameters of 76 mm ≤ D ≤ 500 mm, and in situ solids volume concentrations from 0.10 to 0.45. The concentration distribution predictions are shown to be in excellent agreement with the measurements.

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Imaging measurement technologies for CCS

Arellano

Stavland

Panduro

et al. 2022

2022 IEEE 12th Sensor Array and Multichannel Signal Processing Workshop (SAM)

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Carbon Capture and Storage (CCS) is seen as a key strategy on the path to net-zero emission. Measurements of carbon dioxide-rich mixtures are vital for the forthcoming widespread implementation of CCS. The present study investigates the opportunities for use of tomography throughout the CCS value chain. Tomographic methods offer significant promise in measuring a broad spectrum of properties. Such measurements rely on the identification of contrasting properties from different substances. For tomographic technology to be a viable solution, the timescale and spatial resolution must be sufficient to capture the dynamics of the process being monitored. The present work evaluates to what extent foreseen changes in the properties of various CCS processes can be detected by tomographic measurements. The findings of the study disclose that tomography systems may offer advantages in monitoring and measuring CCS processes. Multimodal configurations could broaden the applicability of tomographic methods, especially in combination with fiscal meters or in scenarios where water presence is foreseen, like post-capture processes involving amines. However, further studies and experimental verification is required prior to widespread use.

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Improved scatter correction model for high attenuation gamma-ray tomography measurements

Cited by 3 publications

References 7 publications

Electrical Resistance Tomography Applied to Slurry Flows

Electrical Resistance Tomography Applied to Slurry Flows

A multispecies 1D concentration distribution model for coarse‐particle slurries

Imaging measurement technologies for CCS

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