Оптимизация аэродинамического режима работы сушильной камеры
Оптимизация аэродинамического режима работы сушильной камеры
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Оптимизация аэродинамического режима работы сушильной камеры
DOI：
10.21122/1029-7448-2016-59-3-260-271
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Татьяна Анатольевна Баранова
中科院分区：
文献类型：
--
作者：
В. А. Сычевский;А. Д. Чорный;Татьяна Анатольевна Баранова
木材利用是工业生产发展的一个重要方向，其中木材的干燥处理占有突出的地位。室内对流干燥是当今木材干燥的主要技术。然而，关于该主题的现有科学文献并没有高度重视干燥装置内的气流结构问题，特别是在水平排堆叠的锯材之间的间隙中。而水平排之间的空气流动有利于木材加热和从边界层去除水分。本文研究了北京航空航天大学木材干燥试验台的空气动力学。白俄罗斯国家科学院Luikov传热传质研究所。木材干燥试验台几何结构复杂，干燥室内干燥剂的空气动力学评价涉及到ANSYS Fluent 14.5软件系统。为此，研究人员开发了对流干燥机安装几何模型。在传热传质研究所木材干燥试验台上，对锯材对流干燥空气动力学进行了物理-数学模拟。在此基础上，分析了干燥剂的流动形态，确定了滞止区。结果发现，木材干燥试验台没有在其最佳空气动力学条件下运行。干燥室最佳空气动力学条件的确定包括考虑在干燥室后壁和木材堆之间的附加通道、在木材堆上方不存在筛网以及在地板和木材堆之间存在筛网。以及干燥剂速度的变化、鼓风机压差的变化、排间采空区量的变化。根据数值模拟结果，提出了干燥装置空气动力学优化的建议。为此，干燥剂在腔室中的速度应当以鼓风机处的压差减小为代价而减小：从初始（150 Pa）到最终（90 Pa）。还需要在燃烧室底板和烟囱之间安装一个额外的滤网。
Wood utilization is a critical direction of the industrial production advancement, where desiccation of wood holds a prominent place. Convective drying in chamber driers is the presentday dominant technique for wood desiccation. Nevertheless, available scientific literature on the subject does not place high emphasis on the issue of gas flow structure inside the drier installations and, in particular, in the clearance between horizontal rows of stacked saw timber. Whereas, the air flowing between horizontal rows facilitates wood heating and moisture removing from the boundary layer. The present article studies aerodynamics of the experimental timber drying test stand at the A. V. Luikov Heat and Mass Transfer Institute of NAS of Belarus. The timber drying test stand geometry structure is complicated, which is why aerodynamics valuation of the drier agent in the chamber involves the software system ANSYS Fluent 14.5. For that end, the researchers developed the convective drier installation geometrical model. A physico-mathematical simulation was developed for sawn timber convective drying aerodynamics in the timber drying test stand of the Heat and Mass Transfer Institute. Based on the computations made, the drier agent flow configuration was analyzed, stagnant pockets identified. It was found that the timber drying test stand was not operating within its optimal aerodynamic conditions. The drying chamber optimal aerodynamic conditions determination includes accounting for an additional canal between the chamber rear wall and the timber stack, absence of the screen above the stack, and presence of the screen between the floor and the stack. As well as variation of the drying agent speed, pressure differrential at the blower, the inter-row gobb amount variation. The paper offers recommendations on optimizing the drying installation aerodynamics based on the numerical simulation results. To this effect, speed of the drier agent in the chamber should be reduced at the expense of reduction of pressure differential at the blower: from initial (150 Pa) to final (90 Pa). It is necessary as well to install an additional screen between the chamber floor and the stack.