直流炉机组简化非线性动态模型  

A Simplified Nonlinear Dynamic Model for Once-through Boiler Units

作　　者：秦志明[1] 刘吉臻[1] 张栾英[1] 谷俊杰[1] 

机构地区：[1]华北电力大学电站设备状态监测与控制教育部重点实验室,保定071003

出　　处：《动力工程学报》2013年第12期955-961,共7页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(50770630);中央高校基本科研业务费资助项目(12MS115)

摘　　要：以某1 000MW超超临界机组为例,基于机理分析并结合机组实际运行数据,通过分析制粉过程、锅炉受热系统、过热器系统和汽轮机的动态特性,建立了直流炉机组在大范围变工况运行下的简化三输入三输出非线性动态模型.该模型以燃料质量流量、总给水质量流量、汽轮机阀门开度为输入,以汽水分离器出口比焓、主蒸汽压力和汽轮机功率为输出.采用机组稳态运行数据确定模型的静态参数,利用负荷变化剧烈的数据辨识动态参数,对模型进行阶跃扰动实验,并与实际运行数据进行对比.结果表明:所建立的模型能够反映机组主要的动态特性和非线性特性,具有结构简单、参数求取容易、复现性好等优点.Taking the 1 000 MW ultra supercritical power unit as an example, a simplified three-input three-output non-linear dynamic model was developed for the once-through boiler unit operating in a wide range of conditions, based on mechanism analysis and actual operation data, and by studying the dynamic characteristics of the pulverizing system, the heat-absorbing surface, the superheating surface and the steam turbine, etc. , which takes the fuel flow rate, the total feed water flow and the valve opening of tur- bine governor as input variables, the outlet specific enthalpy of steam water separator, the main steam pressure and the turbine power as output variables. Static parameters of the model were determined with steady-state operation data of unit, while the dynamic parameters identified using data obtained during vio- lent fluctuation of load. Meanwhile, step response tests were performed to verify the model, of which the results were compared with actual measurements. Results show that the model can well reflect the dynamic and nonlinear characteristics of the unit, with features of simple structure, easy calculation of parameters and good reproducibility.

关 键 词：直流炉机组 非线性 动态模型 模型验证 

分 类 号：TK229.2[动力工程及工程热物理—动力机械及工程]