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ЭЛЕКТРОННЫЙ НАУЧНЫЙ ЖУРНАЛ «APRIORI. CЕРИЯ: ЕСТЕСТВЕННЫЕ И ТЕХНИЧЕСКИЕ НАУКИ»
№ 2 2016
УДК 66.047
THE CHOICE OF MATERIAL AND TYPE OF THE GAS DISTRIBUTION GRID
Biryukova Irina Aleksandrovna
student
Vasenina Svetlana Vladimirovna
student
Tambov state technical university, Tambov
Abstract. The article presents approaches to the choice of the material of the gas distribution grid for the dryer fluidized bed. Describes the features of the design of such gratings.
Key words: grid, dryer, material, design, type, heterogeneity, layer.
ВЫБОР МАТЕРИАЛА И ВИДА ГАЗОРАСПРЕДЕЛИТЕЛЬНОЙ РЕШЕТКИ
Бирюкова Ирина Александровна
студент
Васенина Светлана Владимировна
студент
Тамбовский государственный технический университет, Тамбов
Аннотация. В статье представлены подходы к выбору материала газораспределительной решетки для сушилки с кипящим слоем. Описаны особенности конструкции таких решеток.
Ключевые слова: решетка, сушилка, материал, конструкция, вид, неоднородность, слой.
The question of the choice of grid material is very important. Kera-chemical materials have high corrosion resistance and can withstand high temperatures, but their strength is low in terms of temperature fluctuations and voltage of the. In addition, ceramic is relatively easily eroded, resulting in a gradual increase in the size of holes or pores.
As a rule, preference is given to metal valves, because of their strength and cheapness. Moreover, due to the cooling of incoming gas environment, they are less prone to corrosive effects and high temperatures.
Leakage bubbles and the channel translating mainly occur in the Central axial region of the layer; to resist this trend helps design type. Gas distribution grid type can provide good contacting only when on the periphery of the hole will be larger than in the Central part, causing structural complications at the factory.
However, for any perforated plate a combination of good timing and low resistance requires careful calculation and uneven by area, the location of the holes during manufacture [1].
Device type which consists of slits between grate bars, has approximately the same characteristics as the flat plate, but somewhat less uniform gas distribution.
Nozzle type and caps type are used to prevent the failure of solids through the bars. Despite the complexity of the design, they provide better timing compared to types in addition, solid particles tend to lose mobility and to lie around on a flat surface of the bottom.
Multilayer plate type filter and provide a better distribution of gas in comparison with types however, when they are used may require special precautions to prevent blockage of the inlets of gas distribution grid the filter material. Distributors of this type with filter plates with a diameter of 5.1 cm were used in the production of phthalic anhydride.
Experience has shown that walls and other structures inside the device, such as a heat transfer surface to a certain design, significantly improve the contacting layer, preventing the growth of bubbles.
The increase in the pressure drop in the presence of such internal devices due to the friction between particles and surface, since, in the presence of partitions, it is almost negligible, the latter provide a compromise between the opposite requirements of low resistance and good contact as shown on figure 1.
Fig. 1. Double twin gas distribution grid and product placement
As shown by a separate study, the correct selection of the partitions may be so to improve the quality of fluidization, which eliminates the need for high resistance gas distribution grid themselves. In such a case, sufficient may be the presence of only one tubular grating for introducing the reacting gas like the type.
Sometimes to improve the aerodynamics of the flow in a fluidized bed a gas is introduced through nozzles disposed in the side walls of type. This method was used in furnaces for the roasting of granulated zinc blend.
In the Winkler gas distribution grid gas is introduced into the layer through the six side nozzles type. This provides a significant advantage compared with mechanical lattices, since the latter lead to high operating costs.
The above examples illustrate some of many numerical possibilities of constructing distributions, but in each case only practice makes a final conclusion about the suitability of a modification or combination.
Список использованных источников
1. 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.
2. 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.
3. 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.
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. 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.
6. 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.
7. 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. by A. Burkov. San Francisco, California, USA, 2015. P. 70-72.
