玉米秸秆复合菌兼氧预处理产热特性分析

Analysis of heat production characteristics of corn straw compound microorganism and aerobic pretreatment

为了更加有效地利用玉米秸秆复合菌兼氧预处理环节所产生的生物热,探究预处理过程中反应装置内部及反应堆体的产热特性及温度场分布,利用自制秸秆类生物质兼氧预处理反应器对玉米秸秆进行了复合菌兼氧预处理。凭借微元体的能量守恒规律,结合实验中采集的温度数据以及各项参数,利用多项式拟合理论和Origin数据分析软件拟合得到内热源与时间的关联经验公式,并利用FLUENT软件在二维空间内建立其物理模型,结合实验得到的约束条件及相关的数学模型对反应装置内部及反应堆体温度场分布进行模拟分析,进而形象地模拟出复合菌预处理过程中反应器内部物料温度场的分布以及流动的相关动态及规律。实验表明,模拟的温度场实时分布及变化过程与实验测得的结果基本吻合,从而验证所建立的数学模型是准确且可靠的,为生物法复合菌预处理过程中生物热的研究与利用提供理论支撑。

In order to more effectively use of the bio heat produced by the compound microorganism and aerobic pretreatment of corn straw, the heat production characteristics and temperature distribution of the reaction device and the reactor body during the pretreatment process were investigated. The compound microorganism and aerobic pretreatment was carried out by using the self-made straw biomass and aerobic pretreatment reactor. Based on the energy conservation of the microelements, combined with the temperature data and other paramenters obtained in the experiments, an empirical formula was got relating the inner heat source and time using the theory of polynomial fitting and Origin data analysis software. A two-dimensional physical and mathematical model were established by using FLUENT, and the temperature distribution in the reactor was obtained considering the constraints from the experimental data. And then the distribution of material temperature field in reactor and the related flow dynamic characteristics are investigated in the process of compound microorganism pretreatment. The results show that the simulated temperature field is in agreement with the experimental results. It proves that the mathematical model is accurate and reliable, which provides theoretical support for the research and utilization of biological heat in the biological process of compound microorganism pretreatment.