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ЭЛЕКТРОННЫЙ НАУЧНЫЙ ЖУРНАЛ «APRЮRI. CЕРИЯ: ЕСТЕСТВЕННЫЕ И ТЕХНИЧЕСКИЕ НАУКИ»
УДК 66.047
№ 2 2016
THE CHOICE OF DESIGN OF THE GAS DISTRIBUTION GRID
Pozdnysheva Irina Gennadievna
student
Kombarova Elena Yurievna
student
Tambov state technical university, Tambov
Abstract. The article describes the design of the gas distribution grid for the dryer fluidized bed, allowing to minimize the heterogeneity of the layer arising from the lattice. Given the basic ratio of the size of the grid structure. Key words: fluidized bed, grid, material, design, heterogeneity, dryer.
ВЫБОР КОНСТРУКЦИИ ГАЗОРАСПРЕДЕЛИТЕЛЬНОЙ РЕШЕТКИ
Позднышева Ирина Геннадьевна
студент
Комбарова Елена Юрьевна
студент
Тамбовский государственный технический университет, Тамбов
Аннотация. В статье описана конструкция газораспределительной решетки для сушилки с кипящим слоем, позволяющая минимизировать неоднородности слоя, возникающие у решетки. Даны основные соотношения размеров конструкции.
Ключевые слова: кипящий слой, решетка, материал, конструкция, неоднородность, сушилка.
On the basis of theoretical analysis and experimental researches of process of formation of the inert fluidized bed in the apparatus with the above schemes of gas distribution devices in this work was chosen and implemented so-called double-coupled grating [1].
The need for such an array is due to the fact that the laboratory facility for investigation of continuous drying process that operates in batch mode: start-up, the output on the given mode, carrying out the drying process stop. When you stop the machine, part of dried product (fine fraction), remaining in the column is deposited on the lattice (as shown in figure 1) [2].
Fig. 1. The heterogeneity of the layer close to the gas distribution grid
Given the small size of the particles of dried product in comparison with particles of inert, dried product falls under the grille and into the radiator, which is unacceptable. The use of double grates with offset holes presents design helps prevent this effect or to minimize it [3].
To reduce this phenomenon, developed in a laboratory setting, we built a special sublattice of the gas distribution device, reducing the amount of stagnant zones in the region of connection of the gas distribution grid and the walls of the apparatus (as shown in figure 2) [4].
Fig. 2. Scheme of gas distribution device
The formation and behavior of the fluidized bed in the apparatus of conical and spherical shapes when the ratio H/D = 1 are similar in the investigated velocity range for the selected type of inert.
For cylindro-conical and cylindro-spherical columns was observed under specified impact on the lower part of the base layer the lower part of the column. For devices with a conical bottom part with a small diameter column (D = 80 mm and H/D > 1) was observed spouting mode, and for devices with a spherical bottom part of the channel translating [5].
In cylindrical apparatus, the channel translating was observed only in case of small height of the inert layer (H/D < 1). For other ratios of H/D the behavior of particles in the zone of the primary fluidized bed was similar with columns of conical shape [6]. It should be noted only a more intense move-
ment of the particles of the fluidized bed on the walls of the column down to machine conical form [7].
Thus as the basic form of apparatus for carrying out the drying process were selected cylindrical and conical device with the chosen type of lattice and the gas distribution grid.
^исок использованных источников
1. Рakhomov A. The observed heterogeneity of the fluidized bed / A. Рakhomov, R. Banin, E. Chernikh, E. Loviagina // Scientific enquiry in the contemрorary world: theoretical bas^s and innovative aррroach / ed. A. Burkov. San Francisco, California, USA, 2015. P. 70-72.
2. Pakhomov A.N. Influence of walls of the device on frame of fluidezed bed of inert particles / A.N. Pakhomov, R.Yu. Banin, E.A. Chernikh, E.Yu. Loviagina // Europaische Fachhochschule. 2015. № 3. P. 67-68.
3. Pakhomov A.N. The influence of the shape of the dryer to the nature of binary fluidized bed of inert / A.N. Pakhomov, R.Y. Banin, E.A. Chernikh, E.Y. Loviagina // Applied and Fundamental Studies Proceedings of the 8th International Academic Conference. Publishing House Science and Innovation Center. St. Louis, Missouri, USA, 2015. P. 121-123.
4. Pakhomov A.N. Formation and behaviour of fluidized bed of inert particles / A.N. Pakhomov, S.G. Volostnykh, A.G. Eltsov, L.S. Shuvaev // European Applied Sciences: challenges and solutions 2nd International Scientific Conference. Stuttgart, Germany, 2015. P. 119-120.
5. Pakhomov A.N. The effect of feed slurry to the nature of the fluidized bed / A.N. Pakhomov, R.Yu. Banin, E.A. Chernikh, E.Yu. Loviagina // The Fifth International Conference on Eurasian scientific development Vienna, 2015. P. 122-123.
6. Pakhomov A.N. Method of determination of adhesion of the film dries distillery grains on the substrate / A.N. Pakhomov, R.Y. Banin,
E.A. Chernikh, E.Y. Loviagina, N.A. Sorokina // Proceedinge of the 5th International Academic Conference «Applied and Fundamental Studies». St. Louis, Missouri, 29-30 April 2014. P. 71-73. 7. Pakhomova Yu.V. Product supply and monitoring of fluidized bed / Yu.V. Pakhomova, M.A. Mamedova, D.A. Krivopalova, V.V. Kochetov // European Applied Sciences: challenges and solutions 2nd International Scientific Conference. Stuttgart, Germany, 2015. P. 121-122.
