【作者】 徐永松；

【导师】 童明伟；

【作者基本信息】 重庆大学 ， 制冷及低温工程， 2006， 硕士

【摘要】 生物发酵技术的应用相当广泛,能够缓解能源短缺。能源严峻的形式致使发酵工程技术产业化势在必行。进行发酵过程机理研究,特别是在传热方面的研究和温度场的模拟,以提高大规模工业发酵过程的温控效率就具有重要的工程应用意义。生物发酵基的制备、发酵过程控制优化、发酵发生器及其配套设备等技术国内外都作了一些深入的研究,但是还不完善。相应地,发酵工程有很多应用。由于一些关键的技术有待解决,在国内发酵工程应用相对滞后。对于发酵传热方面的研究就更少。本文采用实验研究、理论分析与数值模拟相结合的方法,研究微生物发酵传热特性及其温度场的分布特性。为以后发酵工程应用提供理论参考。本文首先选PVC板制作一个边长为300mm的立方体箱,根据需要布置热电偶,做好保温工作,搭建好发酵实验台。逐步作了柑桔皮渣和葡萄的自然发酵实验。熟悉了发酵的过程步骤和注意事项。在线采集温度数据,发酵结束进行数据处理,得出温度时间图线。通过曲线图比较分析,结果表明发酵具有阶段性。温度随时间不断变化,说明发酵过程中有内热源产生,在发酵期温度上升明显,揭示发酵反应是放热反应。对发酵试样进行了物性参数测试,从物理性能方面研究发酵物的特性。由此对配套设备作出相应的技术处理。发热量的大小决定了发酵后的剩余产物的用途,合理利用资源。分析了温度对发酵的影响。根据自然发酵过程的温度时间图,拟合温度时间关联式。按能量守恒,经过公式推导,引用测试的物性参数,得到内热源的经验公式。再一次作了葡萄试样的控温发酵实验。向发酵箱中间的不锈钢里面通入冷热水源,控制温度恒定,实时地来控制发酵过程温度,以有利于发酵的进行。处理在线采集的温度数据,得到控温时的温度时间图线。分析表明温度随时间变化不大,温度时间图线几乎是一条水平直线。证明了控温效果明显,达到实验目的。结合实验工况、边界条件,用ansys软件模拟了温度场的分布情况。从数值模拟结果和实验数据结果对比情况看,两者相近,表明了模拟结果正确,对大型工业管网布置提供了理论参考。更多还原

【Abstract】 The application of biological fermentation technology is quite widespread.Which can alleviate the energy to be short. The form of lack energy causes the imperative development of fermentation engineering technology industry. Conducting the academic research on fermentative process, especially in the heat transfer aspect and the temperature field simulation, enhances the efficiency of controlling temperature on the large-scale industrial fermentation process. Which have the important project application significance.Domestic and foreign researcher have all done some thorough research on the biological fermentation base preparation, the fermentative process control optimized, the fermentation generator and its supplementary equipment, and so on. But it is imperfect. Correspondingly, the fermentation engineering has applied very much. Because some important technologies wait for the solution, the domestic fermentation engineering application is relatively. It has less been researched at the aspect of fermentation heat transfer. The author researched microorganism fermentation heat-transfer property and its temperature field distributed characteristic with the union method of the experimental study, the theoretical analysis and the value simulation.Which provide the theory reference for the later fermentation engineering application. In this article first there is a cube box, to manufacture with the PVC board whose side length is the 300mm. According to the needs, the thermo-element is arranged, the heat preservation work is completed, and then the fermentation laboratory bench was done well. Gradually they are made on the natural fermentation of orange peel dregs and grape’s nature fermentation test. It has been familiar about the fermentation process step and the matters attention neededThe on-line gathering temperature data are carried on the processing at the end of the fermentation experiment, and then the result is the temperature time graph. According to the diagram of curves comparative analysis, finally it indicates the fermentation has gradualness. The temperature unceasingly changes as necessary, which shows the fermentative process has the heat source production. The temperature rise is obvious in the fermentation process. It shows that the fermentation response is the exothermic reaction.The author has carried on the natural parameter test to the fermentation specimen,更多还原