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配蓄热器锅炉房供热系统优化运行研究
Research of Optimal Operation for Boiler Plant Heating System with Steam Accumulator
【作者】 何大鹏;
【导师】 彭岚;
【作者基本信息】 重庆大学 , 热能工程, 2006, 硕士
【摘要】 蒸汽蓄热器作为一种先进的节能设备,已被广泛应用于各类锅炉房供热系统中。供热系统的优化运行可以发挥整个系统的理想效能,提高系统的运行效率和经济性。针对供热系统优化运行的研究已经相当成熟,但对于装有蒸汽蓄热器的锅炉房供热系统的研究却比较少。本文旨在建立配蓄热器锅炉房供热系统的优化运行模型,提高系统运行的经济性,并在此基础上,将研究结果付诸于软件实现。课题的研究取得了预期的结果并得出了许多有价值的结论。论文针对锅炉房日负荷变化的特点,采用BP人工神经网络模型对热负荷进行预测。在建立模型时,考虑不同小时的热负荷差异,采用24个单输出的BP网络来分别预测每天24小时负荷值,并利用MATLAB神经网络工具箱NNT(Neural Network Toolbox)分别实现对24个BP网络预测模型的构建及算法改进。预测模型仿真结果证明,该负荷预测模型网络结构小、收敛速度快、预测精度高、具有较高的实用价值。根据配蓄热器锅炉房供热系统的运行特点,论文采用周期分段积分曲线的方法建立了锅炉房分时段运行方案校核计算模型,并对其求解算法进行了阐述,利用此模型可以快速准确地获得锅炉房未来的最优分时段运行方案。考虑到锅炉房负荷分配的问题,论文采用多项式拟合的方法得到了锅炉的煤耗特性方程,并由此获得了锅炉的最佳负荷率;提出了一种具有实用性和经济性的分时段运行锅炉房负荷的最优分配模型,采用序列二次规划(SQP)算法对模型进行求解;详细介绍了SQP算法的理论及算法的MATLAB实现。为提高研究的实用价值,课题采用MATLAB,Access等工具软件,结合DAO数据库技术开发了系统优化运行软件,并详细说明了软件系统的主要功能界面及特点。最后,对研究的结果进行了总结并提出了进一步研究的建议。
【Abstract】 Being advanced energy-saving equipment, steam accumulator is widely used in heating system. The optimal operation of heating system can promote system ideal efficiency, which improves the running economy and reduces costs. As far as heating system is concerned, the study about operation optimization is perfect. However, it is infrequent of specialized study about optimal operation of boiler plant equipped steam accumulator. The thesis aids to build optimal running model of boiler plant with steam accumulator, and increase system’s running economy effectively. Based on the model, the system optimization operation software is completed. The research attains satisfied results and valuable conclusions.According to the varying characteristics of boiler plant daily thermal load, the thermal load forecasting method based on BP neural network is presented. Considering the thermal load diversity of different hour type, 24 single neural network models to forecast every hour load per day are built. Appropriate modified BP algorithms and constructing methods for 24 forecasting models are given based on Matlab’s neural networks toolbox. The simulating result indicates the forecasting model has simple structure, shorting training time and better forecasting precision, proves the model is feasible. In view of the system characteristics, the periodic integral curve method in divided sections is used in constructing the segmentation model of boiler plant. Making use of the model, the optimal scheme of boiler plant running in divided period can been determined. The definite characteristic function of fuel consumption is given by polynomial imitation. As well as the optimum load rates of boilers are advanced. A more practical and economic optimization mathematical model of load distribution for industrial boilers is presented, which is calculated by Sequential Quadratic Programming. At the same time, SQP theory and the achieving methods by MATLAB are introduced in detail. Considering practicability, the system develops the software for optimal running with MATLAB, Access and DAO technology. Equally, the interface and characters of software are presented. Finally summarizing the research, the thesis raises some questions needed to be resolved and gives some opinions.
【Key words】 Steam accumulator; optimal operation; BP network; SQP; interface;
- 【网络出版投稿人】 重庆大学 【网络出版年期】2007年 01期
- 【分类号】TK284.1
- 【被引频次】4
- 【下载频次】291