厌氧发酵反应器一维稳态传热模型的建立与验证

在北方高寒地区,采取适当的加热及保温措施,确保沼气厌氧发酵所需的稳定温度,是关系到沼气工程冬季能否正常运行的关键所在。厌氧发酵反应器传热耗热量是沼气发酵料液加热系统设计的最基本的数据,它直接影响着加热系统方案的选择、供热管道管径和加热器等主要设备的确定。该文在稳态传热理论的基础上,通过对集厌氧发酵和沼气收集为一体式的全地上反应器传热过程的理论分析,建立了一维稳态传热模型,并通过试验对传热模型进行了修正和验证。结果表明,通过模型计算得到的模拟值与实际值在统计上没有明显差异,传热模型可用于反应器耗热量的计算。这为今后大型沼气工程中厌氧发酵反应器热负荷的计算和反应器能耗的预测提供了依据。

Development and verification of one-dimensional model of steady-state heat transfer for anaerobic fermentation reactor

In order to ensure normal operation of the biogas engineering in the alpine regions of northern of China in winter, it is a key factor to keep the stable temperature in the biogas anaerobic fermentation process by means of measurements of proper heating and warming preservation. Thermal consumption of heat transfer in the anaerobic fermentation reactor is the basis for the design of fermentation liquid heating system. It has obvious effect on the selection of heating scheme and determination of major equipments, such as heating system, diameter of heating pipes and heater. Basic on steady state heat transfer theory, a one-dimensional steady heat transfer model was developed by the heat transfer analysis for an integral and overground collection of anaerobic fermentation reactor and methane. This model was modified and validated. The results show that there is no significant difference between the simulation value and the actual value. Therefore, the heat transfer model is feasible for the calculation of thermal consumption of rector. This model can be used for the calculation of heat load and prediction of energy consumption for the anaerobic fermentation reactor.