摘要
针对实验室厌氧发酵试验周期长、产气速率低、人工测量产气量劳动强度大的问题,根据排水法原理,设计了基于LabVIEW软件平台的微量产气在线监测系统,实现了系统标定、测量液体自动添加和补充、产气量实时测量、累积产气曲线实时显示和监测数据自动存储等功能。厌氧发酵试验测试结果表明:在线监测数据与人工测量数据对比,相对误差平均值为-2.30%,相对误差最大值为-3.03%,该系统具有良好的准确度和稳定性,可满足实验室厌氧发酵试验微量产气实时监测的需求。
Biogas yield represents a key parameter for evaluating the stability of fermentation process. In laboratory scale anaerobic fermentation experiments, the gas flow rate is generally low and the experimental period lasts long. In order to solve the problems of labor intensity and low efficiency caused by manual measurement,a system for online gas metering for low gas flow rate with high resolution and friendly interface was developed following the principle of liquid displacement. The system was designed based on the LabVIEW software. Various functions were achieved,including automatic calibration,automatic refilling the displaced liquid to compensate the loss from evaporation,real-time pressure and temperature compensation for volume,generating,displaying,storing accumulated gas production curve and data in real-time,etc. Finally,fermentation experiment was conducted to validate the system＇s performance. Test results showed an average relative error of-2. 30% and a maximum relative error of-3. 03% compared with manual measurement,which indicated a high measurement accuracy of the system. Moreover,the results were stable even in the continuous long run for 80 h,indicating a good performance at operational stability. In conclusion,the system can satisfy the need of real-time gas metering for laboratory scale anaerobic digesters,and it had great practical value.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2016年第10期215-220,301,共7页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家高技术研究发展计划(863计划)项目(2012AA101803)
