区域供热管网运行故障诊断的算法研究及系统仿真

【作者】 赵桂林；

【导师】 朱华；

【作者基本信息】 浙江大学 ， 工程热物理， 2004， 硕士

【摘要】 随着社会经济的发展和人民生活水平的提高，热力管网在城市的供热供暖方面得到了广泛的应用。热力管网在运行中可能会因管体腐蚀、外界环境影响或管网本身质量问题等产生一些运行故障，其发生的时间和地点大多无规律可寻，这对热力管网的运行和维护管理造成极大的影响，严重妨碍了管网运行的经济性和安全性。供热管网运行故障实时诊断系统的研究和开发，对供热管网的经济、安全运行和提高管网自控、管理水平具有重大的现实意义。 本文首先综述了国内外关于管网设计和运行调节的仿真、管网监测系统、热网和其它流体管网运行故障诊断的研究现状，分析了当前供热管网系统在运行故障诊断方面存在的问题和不足。 在前人研究工作的基础上，根据供热管网模型设计和动态仿真理论，完善和实现了架空敷设方式的多用户复杂供热管网系统的实时、动态运行仿真。 利用已建的供热管网可视化仿真系统，本文分析了根据工程实际经验总结而得的各种类型故障，实现了供热管网计算机故障模拟实验系统，为形成供热管网故障诊断系统的专家知识库提供依据；通过对故障模拟实验结果的分析，进一步建立起供热管网故障诊断的系统专家知识库。 根据供热管网系统的故障模拟实验的相应结论以及形成的故障诊断系统专家知识库，在供热管网系统故障诊断的算法研究的基础上，实现了供热管网的故障诊断系统。在故障诊断系统中利用回溯比对技术消除非系统误差，减少伪数据对诊断精度的影响，并结合运用了B+树遍历和B+树反向搜索算法。研究中利用大量管网模型来验证故障诊断系统的诊断精度和科学性，在此基础上还对供热管网运行监测系统的测点布置提出了一些建设性意见。 通过对三种不同敷设方式的管网的比较，本文还进一步分析了直埋管供热管网的特点和优势，并对国内外关于直埋管供热管网的发展现状加以综述。根据工程上直埋敷设方式供热管网的热力设计要求，在热力计算模型方面采用了管段离散化的热力设计方法，实现了直埋敷设方式的供热管网系统的设计和动态运行仿真。更多还原

【Abstract】 As the development of the social economy and the improvement of the living standard, the Heating Power Pipe Network (HPPN) is widely used in city life and industry. During the operating of HPPN, operating failures caused by erosion, environment effects, pipe network quality, etc. are sometimes occurred randomly and unpredictably. It has bad effect on the management of HPPN operating and maintenance, and would further interfere with running economy and security of HPPN. The research and development of heating pipe network operating failure real-time diagnosis system have practical significance for HPPN with economic and safe operation, systematic auto-control and administration level improvement and so on.Firstly, the researches on pipe network designing and operating simulation, system optimization, pipe network monitor, heating pipe net and other kinds of fluid pipe network operating failure diagnosis in the world were summarized in this work. The existing problems and shortages of current studies were put forward and analyzed.Based on the front works of other researchers and the theories of heating pipe network model designing and dynamic simulation, real-time and dynamic running simulation for multi-user complex Heating Power Pipe Network System (HPPNS) of aerial pipeline was achieved.On the basis of the establishment of the heating pipe network visual simulation system and all sorts of typical failures from the experience of engineering practices, the operating failure simulator system for HPPNS was accomplished. The expert KBS of heating pipe network failure diagnosis system was established via the results of failure simulating experiments.The failure diagnosis expert system for HPPNS was finished through studying diagnostic algorithms of different kinds of failures. The technology of backdating and comparing was adopted in the failure diagnosis system to eliminate nonsystematic errors and reduce the effect of diagnostic precision from pseudo-data. And the technology of B+ tree ransacking and B+ tree backward searching algorithms were combined in the system. The diagnostic precision and scientificity of the failure diagnosis system was validated by lots of pipe network models. The constructional suggestions for measurement spots allocation in HPPN’s operating were put forward in this work.Through the comparison of three different modes of the pipe networks, the features and advantages of heating pipe network in underground pipeline way were analyzed. The researches on underground pipeline heating pipe network in the world were summarized. Furthermore, thesimulation of underground pipeline designing and operating for HPPNS was also accomplished based on discrete methods by the requirements of engineering design.更多还原