Modeling of melting process in a single screw extruder for polymer processing

Микулёнок, И. О.; Гавва, Олександр Миколайович; Kryvoplias-Volodina, Liudmyla

doi:10.15587/1729-4061.2018.127583

Cited by 9 publications

(11 citation statements)

References 18 publications

(40 reference statements)

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“…Afterward, the properties of the individual species that are present in the system should be specified. For the solid phase, only the thermal properties are essential, i.e., the heat capacity, enthalpy, thermal conductivity, and radiation properties, because only heat transfer and melting [70][71][72] are important for this phase. These properties can be determined experimentally or numerically.…”

Section: Individual Speciesmentioning

confidence: 99%

Multi-Scale Modeling of Plastic Waste Gasification: Opportunities and Challenges

et al. 2022

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Among the different thermo-chemical recycling routes for plastic waste valorization, gasification is one of the most promising, converting plastic waste into syngas (H2+CO) and energy in the presence of an oxygen-rich gas. Plastic waste gasification is associated with many different complexities due to the multi-scale nature of the process, the feedstock complexity (mixed polyolefins with different contaminations), intricate reaction mechanisms, plastic properties (melting behavior and molecular weight distribution), and complex transport phenomena in a multi-phase flow system. Hence, creating a reliable model calls for an extensive understanding of the phenomena at all scales, and more advanced modeling approaches than those applied today are required. Indeed, modeling of plastic waste gasification (PWG) is still in its infancy today. Our review paper shows that the thermophysical properties are rarely properly defined. Challenges in this regard together with possible methodologies to decently define these properties have been elaborated. The complexities regarding the kinetic modeling of gasification are numerous, compared to, e.g., plastic waste pyrolysis, or coal and biomass gasification, which are elaborated in this work along with the possible solutions to overcome them. Moreover, transport limitations and phase transformations, which affect the apparent kinetics of the process, are not usually considered, while it is demonstrated in this review that they are crucial in the robust prediction of the outcome. Hence, possible approaches in implementing available models to consider these limitations are suggested. Finally, the reactor-scale phenomena of PWG, which are more intricate than the similar processes—due to the presence of molten plastic—are usually simplified to the gas-solid systems, which can result in unreliable modeling frameworks. In this regard, an opportunity lies in the increased computational power that helps improve the model’s precision and allows us to include those complexities within the multi-scale PWG modeling. Using the more accurate modeling methodologies in combination with multi-scale modeling approaches will, in a decade, allow us to perform a rigorous optimization of the PWG process, improve existing and develop new gasifiers, and avoid fouling issues caused by tar.

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Section: Individual Speciesmentioning

confidence: 99%

Multi-Scale Modeling of Plastic Waste Gasification: Opportunities and Challenges

et al. 2022

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“…The model has significant disadvantages. The analysis of single-screw extrusion showed them in papers [5][6][7].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…Many studies consider the modeling of single-screw extruders in detail (for example, papers [2,3,[5][6][7]). However, there is much less attention being paid to the modeling of twin-screw extrusion.…”

Section: Introductionmentioning

confidence: 99%

Modeling the process of polymers processing in twinscrew extruders

Микулёнок

Гавва

Kryvoplias-Volodina

2018

EEJET

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Розроблено математичну модель процесу перероблення полiмерiв у двочерв'ячних екструдерах з одно-i рiзноспрямованим обертанням черв'якiв. Модель враховує теплообмiн полiмеру з черв'яками й цилiндром, а також реальнi граничнi умови (черв'яки обертаються, цилiндр нерухомий). Для аналiзу процесу використано модель видiленого С-подiбного об'єму, який обмежено одним витком нарiзки кожного iз черв'якiв i в якому перебуває певний об'єм перероблюваного полiмеру. Така модель дає змогу описати процес перероблення як у випадку повного, так i часткового заповнення робочого каналу перероблюваним матерiалом. Це особливо важливо в разi дозованого живлення екструдера полiмером, що характерно для сучасного екструзiйного обладнання. Дослiджено температурне поле полiмеру в робочих каналах екструдерiв з одно-i рiзноспрямованим обертанням черв'якiв i виконано порiвняння результатiв розрахункiв з експериментом. Теоретично обґрунтовано та експериментально пiдтверджено, що на вiдмiну вiд одночерв'ячного екструдера у двочерв'ячному екструдерi робочi органи спочатку потрiбно iнтенсивно нагрiвати, а потiм охолоджувати (у напрямку вiд завантажувальної лiйки до екструзiйної головки). Розроблена методика була успiшно використана пiд час вiдпрацьовування режимiв перероблення рiзних полiмерних матерiалiв на двочерв'ячних екструдерах з одно-i рiзноспрямованим обертанням черв'якiв дiаметром 125 i 83 мм, вiдповiдно. Розбiжнiсть розрахованого та експериментального значень температури на виходi двочерв'ячного екструдера з односпрямованим обертанням черв'якiв Ø83×30D не перевищує 10 %. При цьому експериментальне значення температури дещо перевищило задане значення. Це можна пояснити тим, що система термостабiлiзацiї робочих органiв для дослiджених режимiв переробдення не могла ефективно вiдводити теплоту дисипацiї, що видiлялася. Використання розробленої математичної моделi дасть змогу краще прогнозувати ефективнi режими роботи двочерв'ячних екструдерiв, особливо пiд час перероблення матерiалiв з низькою термiчною стiйкiстю Ключовi слова: двочерв'ячний екструдер, рiзно-та односпрямоване обертання черв'якiв, граничнi умови, температурне поле

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“…The analysis of publications on a problem of production of tubular blown polymeric films showed that the majority of them is devoted to numerical and experimental modeling of separate stages of process of their production. At the same time the main attention is paid to process of preparation of polymer melt in the extruder [5][6][7][8][9], to process of a shaping of a polymer film bubble (the overblown polymer tubular film) [1], and also process of cooling of the formed polymer film bubble with a stream of air [10].…”

Section: Literature Review and Research Problemsmentioning

confidence: 99%

Intensification of cooling of tubular blown polymeric packing films with the flowing-down liquid film

Микулёнок¹,

Petukhov²,

Gapon³

et al. 2018

Ukr. food j.

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Modeling of melting process in a single screw extruder for polymer processing

Cited by 9 publications

References 18 publications

Multi-Scale Modeling of Plastic Waste Gasification: Opportunities and Challenges

Multi-Scale Modeling of Plastic Waste Gasification: Opportunities and Challenges

Modeling the process of polymers processing in twinscrew extruders

Intensification of cooling of tubular blown polymeric packing films with the flowing-down liquid film

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Modeling of melting process in a single screw extruder for polymer processing

Cited by 9 publications

References 18 publications

Multi-Scale Modeling of Plastic Waste Gasification: Opportunities and Challenges

Multi-Scale Modeling of Plastic Waste Gasification: Opportunities and Challenges

Modeling the process of polymers processing in twin­screw extruders

Intensification of cooling of tubular blown polymeric packing films with the flowing-down liquid film

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Modeling the process of polymers processing in twinscrew extruders