寒区沼气厌氧发酵反应器保温层厚度的研究——基于限定温降值和温降时间

Study on the Insulation Thickness of Biogas Anaerobic Fermentation Reactor under the Limit the Temperature Drop and Time in the Cold Regions

由于北方寒区冬季沼气工程存在产气率低,甚至无法正常运转等问题,需对反应器采取保温增温措施,而确定技术保温层厚度、降低能耗、保证沼气工程的正能输出是其中一系列关键环节。为此,以一体式全地上立式圆柱型反应器为例,用稳态传热原理分别对反应器的顶、壁和底部进行了传热分析,建立料液温降值与温降时间的数学模型,并用黑龙江省鸡西市兰岭乡大型沼气工程中实际工程监测值对模型进行了验证。最后,运用模型,计算出鸡西地区反应器不同保温层厚度下的温降和耗能,得出顶部散热是反应器整体散热主要影响因素,壁面散热量次之,底部散热量最小。此类反应器壁面不同保温层厚度对料液温降变化无显著影响,这对以后研究反应器耗能具有一定的指导意义。

Due to the low gas production rate of biogas project,even no operation in winter,warming measures was necessary to the reactor.The keys depend on the technical insulation thickness,reducing energy consumption and ensuring a positive output.In this paper,it analyzed the heat transfer of the top,wall and bottom of the reactor by the steady-state heat transfer principle to the ground-type and vertical cylindrical reactor located in the Jixi,Heilongjiang Province.Mathematical model between the temperature drop of the liquid and the time of the temperature drop was established,and was verified by the actual value.It obtained that the heat of the top is the main influencing factors of the energy loss of the reactor,wall heat loss take the second place,the bottom heat loss is minimum by calculating the temperature drop and energy loss in different insulation thickness of the reactor.Different insulation thickness of the wall affected the temperature little.It has a guiding significance for the reactor energy consumption in the future research.