基于Fluent的厌氧反应器加热保温装置参数优化与经济分析

Parameter Optimization and Economic Analysis of an Anaerobic Reactor Heating and Insulation Device Based on Fluent

提升厌氧反应器温度可提高其在低温环境条件下的反应效率。为了优化厌氧反应器加热保温装置工艺参数,降低加温系统投资,以永州市某科研项目现场已有的小型仿生肠道式厌氧反应器为对象,利用计算流体力学的数值模拟方法对装置内部的温度场展开研究。重点考察加热温度和保温材料的选用对反应器加热保温效果的影响,同时以温度场模拟结果为基础计算装置的热能损耗量,并对不同加热方式进行经济性评价。综合分析后得出:当热风送风温度为35℃、选择发泡水泥作为保温材料时,热风加热保温工艺在满足中温厌氧发酵条件下加热保温效果最优,该条件下装置的总热能损耗量为428.24 MJ·d^(-1);采用沼气发电余热利用的加热方式最为经济,其电能出售收入为20281元,费用年值为4047元。此优化方案可为仿生肠道式厌氧反应器热风加热保温装置的设计改进提供理论指导。

Raising the temperature of the anaerobic reactor can improve its reaction efficiency under low temperature environmental conditions.In order to optimize the process parameters of the anaerobic reactor heating and insulation device and reduce the investment of the heating system,this paper takes the existing small-scale bionic intestinal anaerobic reactor in a scientific research project in Yongzhou City as the object,and uses the numerical simulation method of computational fluid dynamics to investigate the temperature field inside the device.This study focuses on the influence of heating temperature and insulation material selection on the heating and insulation effect of the reactor.According to the temperature field simulation results,the thermal energy loss of the device is calculated,which is the basis of the economic evaluation of different heating methods.After comprehensive analysis,it is concluded that the device is heated and insulated optimally under the condition of medium temperature anaerobic fermentation when the hot air supply air temperature is 35℃and the foamed cement is selected as the insulation material.The total heat energy loss of the device at this point is 428.24 MJ·d^(-1),with the best economics of waste heat utilization for biogas power generation,which has a revenue of RMB 20281 from the sale of electricity and an annual value of RMB 4047 in costs.This optimization plan can provide theoretical guidance for the design improvement of the hot air heating and insulation device of the biomimetic intestinal anaerobic reactor.