Application of the dynamic flow sheet simulation concept to the solid-liquid separation: Separation of stabilized slurries in continuous centrifuges

Gleiß, Marco; Hammerich, Simon; Kespe, Michael; Nirschl, Hermann

doi:10.1016/j.ces.2017.01.046

Cited by 26 publications

(28 citation statements)

References 31 publications

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“…Many unit operations with relatively small holdup mass such as screens, some types of mills or mixers can be efficiently treated as steady-state models during dynamic simulation [2,3]. However, in some cases, dynamics of the same classification or solid-fluid separation units cannot be neglected and play an important role [10,11].…”

Section: Why Flowsheet Simulation?mentioning

confidence: 99%

Flowsheet simulation of solids processes: Current status and future trends

Dosta

Litster

Heinrich

2020

Advanced Powder Technology

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Complex manufacturing processes are nowadays applied for production of various solid products. It is very common that for production of particles with desired properties several transformation steps like drying, milling, classification, granulation, etc. should be involved. This leads to the process structures consisting of different apparatuses or transformation substeps connected with material and energy balances. Consequently, development of new processes or optimization of already existing, as well as an optimal control, is a very challenging task, which can be partially solved using numerical modelling.For the simulation of modern production processes, the flowsheet calculations can be effectively used. Starting from the 80s a lot of work focused on the flowsheet simulation of liquid-vapor systems has been done and as result various well-established systems exist today. With respect to the solid processes the intensive research has been started much later.In this contribution we present our view about a current role of flowsheet simulation for modeling of particulate materials and specify the open fields which can be covered in future research.

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Section: Why Flowsheet Simulation?mentioning

confidence: 99%

Flowsheet simulation of solids processes: Current status and future trends

Dosta

Litster

Heinrich

2020

Advanced Powder Technology

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“…Data from recorded values for QI, TI parameters in CT and CV factor of before and after centrifuging [22][23][24][25][26][27][28] are collected in period of receiving coal feed inlet to distillation column in the years 2017-2018 was gathered ( Table 2). These results are for two different feed samples of differing quality classified as received from batteries 1 and 3 of the steel plant.…”

Section: Analysis On Data Of Coal Tar Quality Determinationmentioning

confidence: 99%

“…During this period, CT storage tanks were sampled at 4-day intervals. The samples were centrifuged at a speed of 2000 rpm, equivalent to the operating conditions of the centrifuge used in the refinery [24][25][26][27][28] After performing a centrifugation step in the laboratory, the insoluble parameters of quinoline and toluene solvents and the coke content in the depot CT feed from batteries 1 and 3 were determined, the results of which are shown in Fig. 5.…”

Section: Analysis On Data Of Coal Tar Quality Determinationmentioning

confidence: 99%

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Preventing of flooding phenomena on vacuum distillation trays column via controlling coking value factor

2020

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The occurrence of flooding phenomena (FP) on the vacuum distillation trays column (VDTC) is investigated on a refinery in the middle region of Iran. Accumulation of coke sediment that is occasionally observed in refinery processing using coal tar (CT) feeding is the main reason of the FP on VDTC. This usually occurs at the down-comer areas and the seal pans of the column. Quinolone insoluble (QI) and toluene insoluble (TI) parameters, two routine methods used to measure coke containing sediments, are employed to determine probable critical areas of FP at the down-comers and the seal pans of CT feed in this study. Analyzing the obtained results of QI and TI tests demonstrated that FP at the column is directly related to the quality of CT feeding. For instance, when the QI of the inlet CT in battery 1 increases from 0.56%W in the first sample to 6.5%W in the 25th sample, the vacuum pressure at the top of the distillation column is reduced from − 230 mbar to − 420 mbar. To prevent sediment accumulation of coke and the occurrence of FP, the CT feeds are centrifuged to reduce coke sedimentation at the down-comer areas and the seal pans of VDTC. Moreover, the seal pan trays are replaced by normal ones and all moveable valves with 25 mm diameter on trays 15 and higher in the column, where coke sediment accumulation is observed the most, are modified by installing wider fixed valve (40 mm diameter) trays.

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“…-Due to the complex material parameters, a classical scale-up using the usual methods based on dimensional analysis is no longer effective [4]. However, process simulations on the process level, in which the complex material behavior is also modeled, are no longer a negligible tool [5]. -Big Data is another keyword frequently used for digitalization of processes.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Simulation of Solid‐Bowl Centrifuges as an Aspect of the Advancing Digitization in Solid‐Liquid Separation

2019

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As a part of the Industry 4.0 initiative, the level of digitization in the process industry is increasing. Through a close link between analytics and dynamic modeling, digitization enables the optimization of processes and the model predictive control. In the field of solid-liquid separation using centrifuges, the advancing digitization forces the development of methods for computational fluid dynamics (CFD) and short-cut models to deepen process understanding and process intensification. CFD should be seen as support for experiments to develop suitable short-cut models for the process simulation. Based on the prerequisites, this article describes the development of dynamic models and their application using the example of solid bowl centrifuges. Therefore, the particulate level is first addressed by discussing critical material properties. Afterwards, the developed numerical algorithms to investigate centrifuges on different time and length scales will be presented. Finally, the mathematical modeling on the process level by using short-cut models is shown and discussed for decanter and tubular centrifuges.

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Application of the dynamic flow sheet simulation concept to the solid-liquid separation: Separation of stabilized slurries in continuous centrifuges

Cited by 26 publications

References 31 publications

Flowsheet simulation of solids processes: Current status and future trends

Flowsheet simulation of solids processes: Current status and future trends

Preventing of flooding phenomena on vacuum distillation trays column via controlling coking value factor

Modeling and Simulation of Solid‐Bowl Centrifuges as an Aspect of the Advancing Digitization in Solid‐Liquid Separation

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