A novel gas-solids separator scheme of coupling cyclone with circulating granular bed filter (C-CGBF)

Gao, Sihong; Zhang, Dandan; Fan, Yunyun; Lu, Chunxi

doi:10.1016/j.jhazmat.2018.07.065

Cited by 29 publications

(6 citation statements)

References 32 publications

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“…Setting a butterfly valve on the inclined pipe is originally intended to adjust the granules circulation flux. However, it is found that only two valid and discernible granular circulation fluxes (0.04 and 0.22 kg/s) are achieved by varying the opening of the valve because of its insufficient flexibility . Although mechanical valves including the rotary valve are commonly used in cold-model experimental setup, they are normally perceived as not suitable for industrial application, especially in the HTHP situations.…”

Section: Experimental Setup and Methodologymentioning

confidence: 99%

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Separation Performance in a Novel Coupled Cyclone with Built-in Circulating Granular Bed Filter (C-CGBF)

Gao

Zhang

Fan

et al. 2018

Ind. Eng. Chem. Res.

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A compact dedust scheme coupling a cyclone with a built-in circulating granular bed filter (C-CGBF) for continuous hot gas cleanup is introduced. The effects of the operation parameters including the inlet dust concentrations, the inlet gas flow rates and the granules circulation fluxes on the separation performance of the C-CGBF are experimentally investigated using the FCC catalyst particles in a cold model setup. Experimental results reveal that stable/ high collection efficiency, generally higher than 98%, is achieved. A real-time monitoring method is developed for timely reflecting the instantaneous variation of the granules circulation flux, in which way a notable critical flux is observed as the transition from the fixed bed into the moving bed regime. The individual separation contributions of the cyclone and the built-in granular bed are both estimated. The particles collected by them are also analyzed respectively for comparing their size distributions.

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Section: Experimental Setup and Methodologymentioning

confidence: 99%

“…A compact dedust scheme coupling a cyclone with a built-in circulating granular bed filter (C-CGBF) for continuous hot gas cleanup is introduced in this paper. The centrifugal separation (the cyclone) and the filtration (the built-in granular bed filter) are then reasonably combined in one device.…”

Section: Introductionmentioning

confidence: 99%

Separation Performance in a Novel Coupled Cyclone with Built-in Circulating Granular Bed Filter (C-CGBF)

Gao

Zhang

Fan

et al. 2018

Ind. Eng. Chem. Res.

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“…Каждое круглое отверстие позволяет поддерживать вихревую структуру по высоте. При вращении газа в межтрубном пространстве возникают центробежные силы высоких значений, влияющие на сепарацию мелкодисперсных частиц диоксида кремния из газового потока, преимущественно за счет двух факторов [13]: первый -маленький радиус вихря, позволяющий увеличить значения центробежных сил, и второй -ускорение каждого вихря за счет сонаправленного дви- жения соседних вихрей в точках контакта, что является особенностью данного устройствапрямоугольные щели проделаны таким образом, чтобы при выходе из них формировались 2 завихрения, при этом каждое завихрение при своем вращении контактирует с соседними завихрениями, в точке контакта вектора скорости сонаправлены, в результате за счет сил инерции в данных точках завихрения придают друг другу дополнительный импульс к движению. Вследствие этого количество круглых отверстий в пластине, которые равны количеству завихрений в устройстве, в 2 раза больше, чем прямоугольных щелей.…”

Section: описание устройстваunclassified

“…Пористость фильтровальных материалов подбирается индивидуально в зависимости от характеристик частиц в газовом потоке. Следует отметить, что использование циклона перед рукавным фильтром позволяет предотвратить преждевременный износ фильтровальных материалов за счет улавливания относительно крупных частиц размером более 20 мкм [10][11][12][13][14]. Ключевыми недостатками двухступенчатой системы улавливания частиц диоксида кремния из газового потока является высокое гидравлическое сопротивление, приводящее к высоким энергетическим затратам линии, и необходимость в периодической очистке рукавов и замена фильтровальных материалов.…”

Section: Introductionunclassified

Estimation of power consumption when trapping finely-dispersed particles in a separator with coaxially-arranged pipes

Зинуров¹,

Дмитриев²,

Badretdinova³

et al. 2021

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This article sets out to estimate power consumption when trapping finely-dispersed particles of silicon dioxide using a separator with coaxially-arranged pipes, as well as the efficiency of such an installation. To this end, a numerical simulation of the movement of a gas flow with finely-dispersed particles of silicon dioxide through a separator with coaxial pipes was carried out in the ANSYS Fluent software. During the experiments, the inlet gas flow rate varied from 5 to 10 m/s, while the width and height of the rectangular slit ranged 2.1-8.7 and 10-30 mm, respectively. It was shown that the maximum efficiency of collecting finely-dispersed silicon dioxide particles and the minimum power consumption required for pumping the gas flow through the installation largely depends on the formation of a stable vortex structure in the interpipe space. The research showed that the optimal inlet gas flow rate equals 7.5 m/s. At this rate, the efficiency of particle collection corresponds to higher rates with a devia tion of ± 6%. In this case, the pressure loss is 1.74 times lower than that at higher rates. In order to achieve an efficiency of at least 90% with the height of the rectangular slit from 10 to 30 mm, the Stokes numbers must correspond to values of more than 50. The power consumption required for pumping a gas containing silicon dioxide particles through a separator equipped with coaxial pipes comprises from 1.9 to 31.2 W at the inlet gas flow rate of 7.5 m/s. In this case, the parameters of the rectangular slit are as follows: width - from 2.1 to 8.7 mm, height - from 10 to 30 mm. The use of separators with coaxially-arranged pipes in technological lines based on plasma technologies can become an alternative to installations for fine gas purification.

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“…The difference was that the cross-flow GBF was used in their studies. Gao et al − conducted detailed experiments to figure out the composition of the pressure drop. You et al reported that the maximum tangential velocity was located at the inlet section, which was around 1.2 times larger than the inlet gas velocity based on the simulation results.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Swirl Space Ratio on the Performance of a Coupling Cyclone with a Built-In Granular Bed Filter: An Experimental Examination

Chang

Dao-ming

Gao

et al. 2020

Ind. Eng. Chem. Res.

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The gas–solid separator of coupling cyclone with a built-in granular bed filter (GBF) was proposed to capture dust emitted from the industrial source. The coarse dust was separated by the rotatory motion, and the fine dust entrained by the swirl was collected by the GBF. A new geometrical parameter, named as the swirl space ratio, was introduced to characterize the mutual impacts on the coupled separator. Experimental results showed that the pressure drop decreased 10% when the swirl space ratio increased from 0.37 to 0.43, while the collection efficiency was enhanced significantly. The coupled separator with a large swirl space ratio exhibited excellent separation characteristics according to the separation quality factor. Furthermore, the contribution ratio of the cyclone shell was strengthened by increasing the swirl space ratio. The variation in the bed voidage and the pressure drop was completely opposite. The breakage phenomenon was observed in the circulation of the collector particles.

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A novel gas-solids separator scheme of coupling cyclone with circulating granular bed filter (C-CGBF)

Cited by 29 publications

References 32 publications

Separation Performance in a Novel Coupled Cyclone with Built-in Circulating Granular Bed Filter (C-CGBF)

Separation Performance in a Novel Coupled Cyclone with Built-in Circulating Granular Bed Filter (C-CGBF)

Estimation of power consumption when trapping finely-dispersed particles in a separator with coaxially-arranged pipes

Effects of the Swirl Space Ratio on the Performance of a Coupling Cyclone with a Built-In Granular Bed Filter: An Experimental Examination

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