The gas flow dynamics in a separator with coaxially arranged pipes

Abstract

In order to increase the efficiency of gas purification from the particles of up to 20 microns and to increase the service life of bag and electrostatic filters, the authors propose to use a centrifugal separation device with coaxially arranged pipes to be installed before the fine purification devices. The numerical studies of gas dynamics in a separation device were conducted in ANSYS Fluent software package. As a result of conducted numerical studies, it was found that the pressure loss in the centrifugal separation device is not more than 70 Pa at the inlet gas flow rate from 1 to 15 m/s and the width of rectangular hole within the range from 10 to 15 mm. The low pressure losses are caused by the design features; in particular, the resulting vortices in the inter-cylindrical space practically do not contact the wall surfaces of device. The equations of pressure loss depending on the width of rectangular holes and the hydraulic resistance coefficient of separation device depending on the inlet gas flow rate were obtained. The design coefficient of hydraulic resistance of separation device was equal to 0.45.

Numerical Study of Vortex Flow in a Classifier with Coaxial Tubes

“…In particular, at the inlet gas velocity of 2 m/s, there are two regions where the efficiency increases sharply (areas with peaks), corresponding to particle size ranges of 10 to 30 and 30 to 40 µm, one region with a peak for particles of 5 to 30 µm at 5 m/s, and one area with a peak for particles of 5 to 20 µm at 8 m/s. (7) The pressure loss in the classifier is not over 700 Pa at a gas velocity of up to 8 m/s.…”

“…The authors have designed a pneumatic vortex classifier with coaxial tubes [6][7]. Distinctive features of the device are high selectivity with low-pressure losses, simplicity of the design regarding lack of moving mechanisms, low capital, and operating costs.…”

Separation of Fine Particles from Gas in Paint-Spraying Booths

“…Numerical simulations were performed by means of ANSYS Fluent software package, designed for solving problems of fluid mechanics, using the finite element method in the form of unstructured grid technology, which allows you to get an accurate solution for areas with large flow gradients. Transition SST, one of the latest modifications of Menter's SST models, was used as a turbulence model, in which two additional transport equations are introduced; one is for the intermittency of turbulence, and the second one is for the criterion of transition start in thickness units of momentum loss of the Reynolds numbers [14][15][16][17][18][19][20][21]. The number of cells when creating the grid was approximately 785,000.…”

Численное Моделирование Газодинамики В Центробежном Сепараторе

“…Например, уловленные частицы золы на тепловых электрических станциях находят широкое применение в строительной промышленности. При добавлении уловленной золы в строительные материалы повышается их прочность, что приводит к улучшению их эксплуатационных свойств и позволяет добиться экономического эффекта [4][5][6][7][8]. Для решения проблемы очистки газовых потоков от мелкодисперсных частиц существует большое количество разнообразных аппаратов, существенно отличающихся друг от друга конструкцией и принципом действия.…”