填料塔液泛在線監(jiān)測的改進(jìn)主元分析方法研究
[Abstract]:Liquid gas velocity is the upper limit of gas velocity in packed column operation. If the gas velocity is too low to avoid flooding, it will lead to uneven distribution of gas and liquid and waste of investment. The real-time monitoring of the running state of the packed tower can not only guarantee its operation under normal working conditions, but also improve the equipment efficiency. It has important practical significance and industrial application prospect. In this paper, the research status of liquid flooding monitoring is reviewed firstly, and a data-driven method is proposed to be used in the process of liquid flooding monitoring in packed column. Considering that the single principal component analysis (PCA-Principal Component Analysis) monitoring model is difficult to meet the monitoring requirements of complex working conditions, an improved dynamic principal component analysis (Dynamic Principal Component Analysis),) method is proposed and verified by designing different experiments in combination with the strategy of integrated learning. Finally, the software of liquid flooding real-time monitoring based on improved principal component analysis method is developed to realize the real-time monitoring of the running state of packed tower. The main innovations are as follows: (1) aiming at the shortcomings of traditional liquid flooding monitoring model which is difficult to obtain wide recognition and considering the current situation that process data are not fully utilized, PCA and its improved method are applied to the flooding monitoring of packed column. By analyzing the monitoring results, aiming at the diversity of modeling data and the difficulty of single monitoring model to meet the monitoring requirements of complex operating conditions, a monitoring method based on fuzzy C-means (FCM) fuzzy c-Means clustering is proposed. The integration of monitoring results is realized by Bayesian weighting. Taking DPCA as an example, a Enhanced-DPCA monitoring model is established. It is proved by experiments that the integrated monitoring model can make better use of the information of different characteristic data, which is helpful to improve the monitoring effect. It can ensure that the packed tower can operate safely and efficiently under the operating gas velocity. (2) combined with the data acquisition software, the real-time monitoring software of the packed tower based on Enhanced-DPCA method is developed. Firstly, according to the characteristics of real-time data, the parameters of the monitoring model are adjusted to make it more suitable for real-time process data features. Then, the real-time monitoring of the running state of packed tower under different spray density is realized. The results show that the operating gas velocity of the packed tower can reach 80% of the liquid gas flooding velocity by the software, which is obviously higher than the 60% determined in the traditional industrial process, which is beneficial to improve the operation efficiency of the equipment. Finally, the control module is added to the monitoring software to realize the automatic operation of the packed tower, and the wind speed can be automatically adjusted to normal state after the liquid flooding is monitored.
【學(xué)位授予單位】:浙江工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TQ053.5
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