作者：姚燕¹, 邱倩¹, 沈晓敏¹, 金佩薇¹, 梁晓瑜¹, 朱颖颖²

作者单位：1. 中国计量大学计量测试工程学院，浙江 杭州 310018;
2. 宁波大学海运学院，浙江 宁波 315211

关键词：测控技术;厌氧发酵;自动测量;排水-称重

摘要：

针对实验室现有的厌氧发酵装置产气测量存在费时费力、人眼读数误差较大、自动化程度低等问题，设计一种基于LabVIEW的甲烷产气量自动测量系统。提出采用排水法与称重计量法结合的测量方法，以实现产气量自动测量。称重传感器获取发酵甲烷产气排水后得到水的质量，经换算得到排水体积即甲烷产气体积。利用LabVIEW编写软件平台，采用NI USB-6251数据采集卡对发酵过程中的关键参数如甲烷产气量、温度和pH值进行实时采集、处理、显示及存储，同时控制夹管阀和蠕动泵实现自动补充排水液的功能。利用微量注射器对自动测量系统开展性能验证实验。试验结果表明：该装置的测量平均相对误差最大值为1.10%。该系统可以满足发酵实验对甲烷气体的测量需求，不仅能够提高自动化水平还可以提高测量准确性。

Design of automatic measurement system for methane gas production based on LabVIEW
YAO Yan¹, QIU Qian¹, SHEN Xiaomin¹, JIN Peiwei¹, LIANG Xiaoyu¹, ZHU Yingying²
1. College of Metrology & Measurement Engineering, China Jiliang University, Hangzhou 310018,China;
2. Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, China
Abstract: In order to solve the problem of time consuming and laboriousness, large errors in eye readings, low automation in gas measurement of laboratory anaerobic digester, an automatic Biochemical Methane Potential measurement system based on LabVIEW was designed to realize the automatic monitoring function. The weight of the water is obtained by a weight sensor after the drainage of methane fermentation, and the methane gas production is the drainage volume after conversion. LabVIEW was used to write the software platform, and the NI USB-6251 data acquisition card was used to collect, process, display and store the key parameters in the fermentation process, such as methane gas production, temperature and pH value of the anaerobic digester in real time. At the same time, the pinch valve and the peristaltic pump were controlled to automatically replenish the drainage liquid. The performance test of the automatic measurement system was carried out by means of micro-injector. The test results were compared with the manual measurement data, and the average relative error was 1.10%. The system can satisfy the needs of measurement of methane gas in laboratory anaerobic digester, which can not only improve the automation level but also improve the measurement accuracy.
Keywords: measurement and control technology;anaerobic fermentation;automatic measurement;liquid displace gas-weight
2021, 47(2):113-118  收稿日期: 2019-11-11;收到修改稿日期: 2019-12-06
基金项目: 国家自然科学基金项目（51606181）
作者简介: 姚燕(1978-),女,河南许昌市人,副教授,博士,研究方向为近红外光谱分析以及能源计量技术
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