Simulation of the granule bed on the temperature field within heating furnace
| Autor: | Jung-Chao Hsu, 徐榮照 |
|---|---|
| Rok vydání: | 2007 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 95 This thesis mainly studies heating process of the granule bed and makes the outlet of the granule bed temperature approximately in 200oC. Using the element software of ANSYS simulates the temperature changes of the furnace, sesame and air during the baking process. The research includes two parts: The first part is the experimental part which is about the measure of the thermal conductivity coefficient of the sesame. In order to find out the relations between the temperature and the thermal conductivity coefficient k value in different moisture degrees of the sesame, the research proceeds to measure separately moisture degrees of the sesame from 3% to 20%, in the temperature range 20oC~60oC, and the same qualitative sesame. According to this measurement, It shows that the more moisture degree, the more conductivity coefficient. But the moisture degree which exceeds 13%, the k value does not increase too much range. Therefore, this research selects the thermal conductivity coefficient k value of the moisture degree of 13% to be the analytic parameter. Its thermal conductivity coefficient is k =0.1507 + 0.0012T, the temperature T unit in the equation is oC. The second part is simulation analysis which uses ANSYS software. At the beginning, the model which includes three parts: granule bed, air, and furnace are chosen for analysis. Input date are the specific parameters such as the convection coefficient of inside and outside furnace, the air flow of the furnace, the granule bed flow and angular speed of the furnace, and different three sections of heat flux for furnace, then begin to simulate and find out the optimization parameter of heating furnace. While providing the total heat flux of furnace is 10,500 W/m2 and the heat flux ratio is 2:3:2 which respectively is front section, mid section, and back section (preheating, heating, and cooling). In no rotary effect and the air flow is 6.97m/s and 4.2m/s, due to the effect of air flow, when the air flow is higher, the heat will be taken away and the average temperature will be reduced in order to prevent temperature from being too high. When the total heat flux is 8000W/m2, the heat flux ratio is respectively 1:2:1, 1:3:2, 2:2:2, 2:3:1, 2:3:2. In the condition of the outlet of the granule bed temperature approximately in 200oC, when the rotational speed of the furnace is 10rpm and heat flux ratio is 1:2:1, the average temperature of outlet of the granule bed is the most optimal result; when the rotational speed of the furnace is 15rpm and heat flux ratio is 2:2:2, the average temperature of outlet of the granule bed is the most optimal result. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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