百万超超临界机组冷端系统能效评价与诊断研究

发布时间：2018-12-12 05:21

【摘要】：本文以某电厂超超临界百万机组为背景,对机组冷端系统进行能效监测、分析、评价与诊断。冷端系统对电厂能效水平具有较大影响,是保证电厂高效经济安全运行的重要部分,因此需重点研究。首先,对某电厂冷端系统设备组成、功能及规格进行了详细的分析,并作出冷端系统流程图与设备树。依据三个原则,选取合适的指标与参数,在此基础上构建冷端系统能效指标体系,搭建冷端系统数学模型。然后,采用基于数据挖掘(k均值聚类)的方法获取基准值,并结合EBSILON仿真平台对所挖掘的基准值进行验证。利用耗差因子分析原理,对冷端系统指标类耗差因子与参数类耗差因子分别进行详细分析研究。依据评优系数、评差系数对所有能效指标进行单指标评价,综合得到冷端系统的能效评价评语。同时对不同工况、不同循环水温度工况合理安排循环水泵运行方式。根据能效评价结果,对冷端系统实施能效诊断,分别建立了冷端系统能效异常知识库、数据库和模型库,利用故障树分析和故障模式及影响分析的方法,结合导致冷端系统能效水平下降原因、影响、征兆、解决措施等因素,在能效水平异常时,利用能效诊断规则IF-THEN,寻找到相应的故障模式,提供了一套完整的能效诊断流程。最后阐述了某电厂超超临界百万机组能效评价与故障诊断系统软件的工程应用。介绍了系统的开发环境、软件功能、预期目标等,实现了本文理论研究的综合应用。并对冷端系统三种典型工况进行了能效分析与评价实例探究,验证了所开发系统模块的有效性。
[Abstract]:In this paper, the energy efficiency monitoring, analysis, evaluation and diagnosis of the cold end system of a power plant are carried out under the background of ultra supercritical million units. The cold end system has great influence on the energy efficiency level of power plant, and is an important part of ensuring the efficient, economical and safe operation of the power plant, so it needs to be studied emphatically. Firstly, the composition, function and specification of the cold end system in a power plant are analyzed in detail, and the flow chart and equipment tree of the cold end system are made. According to the three principles, the appropriate indexes and parameters are selected, and then the energy efficiency index system of the cold end system is constructed, and the mathematical model of the cold end system is built. Then, the data mining (k-means clustering) method is used to obtain the datum value, and the datum value is verified with the EBSILON simulation platform. Based on the principle of loss factor analysis, the index class loss factor and parameter class consumption factor of cold end system are analyzed in detail. According to the evaluation coefficient and the difference coefficient, the single index evaluation of all energy efficiency indexes is carried out, and the evaluation of energy efficiency of the cold end system is synthetically obtained. At the same time, the operation mode of circulating water pump is arranged reasonably under different working conditions and different circulating water temperature conditions. According to the result of energy efficiency evaluation, the energy efficiency diagnosis of cold end system is carried out, and the knowledge base, database and model base of energy efficiency anomaly of cold end system are established, and the methods of fault tree analysis, fault mode and impact analysis are used. Combined with the causes, effects, symptoms, solutions and other factors that lead to the decline of energy efficiency level of cold end system, when the energy efficiency level is abnormal, the energy efficiency diagnosis rule (IF-THEN,) is used to find the corresponding fault mode. A complete process of energy efficiency diagnosis is provided. Finally, the engineering application of energy efficiency evaluation and fault diagnosis system software for ultra supercritical million units in a power plant is described. The development environment, software function and expected target of the system are introduced, and the comprehensive application of this paper is realized. An example of energy efficiency analysis and evaluation of three typical cold end systems is given to verify the effectiveness of the developed system modules.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM621

【参考文献】