基于Fluent流场模拟的半干式连续厌氧发酵反应器的设计及中试试验

Design and Pilot Test of Semi-dry Continuous Anaerobic Fermentation Reactor Based on Fluent Flow Field Simulation

为实现干清粪便的无害化处理,提高干清粪便的厌氧发酵效率,设计了一款300 m^(3)适合干清粪便的半干式连续厌氧发酵反应器。介绍了半干式连续厌氧反应器的基本构造与工作原理,通过对发酵罐体的结构参数,主要装置部件等设计计算,利用有限元分析进行强度的校核,并利用Fluent流场模拟软件对物料运动状态进行仿真,确定了厌氧发酵反应器结构参数,并进行中试试验。试验结果表明:半干式连续厌氧反应器可在工作过程中维持稳定的工作环境,并且能够迅速将发酵原料进行厌氧消化反应,能够维持平均日产气量在410.6 m^(3),容积产气率达1.37 m^(3)·m^(-3)d^(-1)。针对畜禽干清粪便厌氧发酵来说,半干式连续厌氧发酵更为适合,并且能够维持较高的产气效率,沼气工程整体运行稳定,工作性能可靠。

In order to realize the harmless treatment of dry manure and improve the anaerobic fermentation efficiency of dry manure, a 300 m^(3) semi-dry continuous anaerobic fermentation reactor suitable for dry manure was designed in this paper. This paper introduces the basic structure and working principle of the semi-dry continuous anaerobic reactor. Through the design and calculation of the structural parameters of the fermentation tank and the main device components, the strength was checked by finite element analysis, and the material motion state was simulated by Fluent flow field simulation software. The structural parameters of the anaerobic fermentation reactor were determined and the pilot test was carried out. The test results show that the continuous anaerobic reactor for dry and clean manure can maintain a stable working environment during the working process, and can quickly carry out anaerobic digestion reaction of fermentation raw materials, and can maintain the average daily gas production at 410.6 m^(3), and the volume gas production rate reaches 1.37 m^(3)·m^(-3)d^(-1). The overall operation of the biogas project is stable and the working performance is reliable.