本文選題：冷端系統(tǒng)　切入點：能效評價　出處：《華北電力大學》2015年碩士論文

【摘要】：直接空冷機組在我國富煤貧水地區(qū)得到了快速的發(fā)展。本文針對直接空冷機組,建立了能效評價模型,實現(xiàn)了冷端系統(tǒng)能效實時評價。對評價結(jié)果不理想的情況分別按評價等級進行運行可調(diào)類參數(shù)優(yōu)化或冷端系統(tǒng)可維護類故障診斷,以提高冷端系統(tǒng)的能效水平,提高直接空冷機組的熱經(jīng)濟性和安全性。能效評價模型運用了AHP-F評價方法展開評價。能效評價的等級分別是優(yōu)秀、良好、一般、需改進、需整頓。當冷端系統(tǒng)性能評價結(jié)果為需改進時,冷端系統(tǒng)需要優(yōu)化調(diào)整。優(yōu)化的目標值是最佳背壓,本文建立了冷端系統(tǒng)變工況數(shù)學模型,結(jié)合直接空冷電廠背壓功率修正曲線和風機群耗功與背壓的關(guān)系曲線,得出了變工況條件下確定最佳背壓及最佳風速的辦法,以最佳背壓為基準值進行計算,可以得出冷端系統(tǒng)優(yōu)化后的節(jié)能空間。當冷端系統(tǒng)的評價結(jié)果為需整頓時,冷端系統(tǒng)的可維護類故障診斷任務被觸發(fā)。冷端系統(tǒng)性能下降的故障頂事件是真空下降,可能是由風機系統(tǒng)故障、軸封系統(tǒng)故障、抽真空系統(tǒng)故障、主凝結(jié)水系統(tǒng)故障、空冷凝汽器設備的其他故障引起的。本文針對13個故障,結(jié)合FTA分析方法,進行了故障模式分析、故障征兆分析、故障原因分析、故障影響分析和故障維修措施分析,建立了十分完備的冷端系統(tǒng)知識庫。在此基礎上,應用模糊模式識別進行冷端系統(tǒng)的故障診斷,研究表明,糊模式識別診斷方法的診斷準確性高、分離效果明顯。
[Abstract]:Direct air-cooled units have been developed rapidly in coal-rich and water-poor areas in China.In this paper, the energy efficiency evaluation model is established for direct air cooling unit, and the real time energy efficiency evaluation of cold end system is realized.In order to improve the energy efficiency level of the cold end system and improve the thermal economy and safety of the direct air cooling unit, the optimal operation parameters of the cold end system or the fault diagnosis of the maintainable type of the cold end system are carried out according to the evaluation grade.The energy efficiency evaluation model uses the AHP-F evaluation method to carry out the evaluation.The rating of energy efficiency evaluation is excellent, good, general, need to be improved, need to be rectified.When the performance evaluation of the cold end system needs to be improved, the cold end system needs to be optimized and adjusted.The optimum target value is the optimum backpressure. In this paper, a mathematical model of the cold end system under variable working conditions is established, combining with the power correction curve of backpressure in direct air-cooled power plant and the relation curve between fan group power consumption and backpressure.The method of determining the best back pressure and the best wind speed under the condition of variable working condition is obtained. The energy saving space after the optimization of the cold end system can be obtained by using the best back pressure as the reference value.When the evaluation result of the cold end system is rectified, the maintainable fault diagnosis task of the cold end system is triggered.The failure top event of the performance decline of cold end system is vacuum drop, which may be caused by fan system fault, shaft seal system fault, vacuum pumping system fault, main condensate system fault, other faults of air-cooled condenser equipment.In this paper, according to 13 faults, combined with FTA analysis method, fault mode analysis, fault symptom analysis, fault cause analysis, fault impact analysis and fault maintenance analysis are carried out, and a very complete knowledge base of cold end system is established.On this basis, the fault diagnosis of cold end system is carried out by using fuzzy pattern recognition. The research shows that the diagnosis method of paste pattern recognition has high diagnostic accuracy and obvious separation effect.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM621

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