Comprehensive Stability Evaluation of Wet Desulfurization System Based on Cause-ANP-Grey Cluster Analysis

Abstract

Wet flue gas desulfurization technology is the most widely used desulfurization technology at present, which has the characteristics of high desulfurization efficiency and good economy, and has been widely used in the flue gas desulfurization of coal-fired power plants. But the desulfurization system overall uncertainty, in order to be able to wet desulphurization system stability comprehensive quantitative assessment, according to the actual operation situation of wet desulfurization in thermal power plants, this article from the process indicators, equipment, instrument automation, electrical, auxiliary system, daily operations management from six aspects to carry on the analysis, to find the cause of system operation is unreliable and restriction conditions. The cause-ANP-grey clustering analysis method was used to analyze the reasons leading to the instability of the wet desulfurization system, and the system operation condition evaluation model was established. The ANP is used to calculate the weight of various influencing factors and analyze the grey clustering comprehensively. The weight ranking, comprehensive score and evaluation grade are obtained. Based on the actual case of wet flue gas desulfurization in a power plant in Guangdong Province, the influencing factors of unstable project operation are divided into 6 categories and 24 items, and the evaluation grade is divided into 5 grades: “very stable”, “relatively stable”, “basically stable”, “less stable” and “unstable”. Through the analysis and evaluation of the case and the comparison with the field detection, we can get: (1) the plant of wet desulphurization system technical index for stability evaluation level basically stable, the equipment level of stability evaluation for the unstable, basically stable, electrical equipment, automation instrument stability level for stability evaluation ranks as the basic stability, auxiliary system evaluation as the basic stability, the daily operational management evaluation class is unstable. (2)The comprehensive score of the case project was 0.5554, and the evaluation grade was “basically stable/level 3” according to the risk grade comparison table. The evaluation result is consistent with the actual situation, which indicates that the stability evaluation of the wet desulfurization system has good applicability.