Computational fluid dynamics analysis for improving the uniformity of flow field in heat air drying kilns

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Abstract

Because the uniformity of the wind speed flow field in the hot air drying kiln directly affects the distribution of the temperature field in the kiln, to improve the uniformity of air distribution in the existing wood hot air drying kiln, CFD software was used to analyze the 3-D flow field of each improved scheme. A combination of visual comparison and analysis methods and data comparison and analysis methods be used, to serve as the basis for assessing the feasibility and rationality of the improvement schemes. Without adding baffle plates or altering the structure to incorporate right-angle surfaces, the kiln?s structure was optimized by adjusting the position of the air outlet and installing air-flow distribution chambers. This paper innovatively introduces the Theory of Inventive Problem Solving to analyze and solve the flow field optimization problem in the kiln. The difference between this method and the existing research methods is that the solution process is more logical and the solution the fundamental problem is more accurate. The experimental results show that when the air supply speed of Scheme S8 is 3~7 m/s, the flow field of kiln Zone C (material drying area) meets the ideal range of 1~3 m/s. In addition, under the same working condition (3 m/s), the velocity differences of Scheme S8 is closer to 0 than that of Scheme S0, and the velocity unevenness coefficient is reduced by 18.44%.

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