自然循环余热锅炉动态仿真研究

建立自然循环余热锅炉的动态模型并进行仿真,对研究余热锅炉的动态特性具有重要意义。引入容性环节与阻性环节相结合的方法,对自然循环余热锅炉的关键部件进行更为合理的划分,解决了各部件模块间的可连接性问题;从对象工作机理出发,将汽包水面下工质集总成具有一定干度的汽水混合物,从而简化了汽包建模仿真的复杂度。利用所建模型对联合循环中燃机和汽机变工况时余热锅炉的动态特性进行了仿真研究,结果不但证实了模型的有效性,并且可以满足更大范围的动态仿真要求,可以为各类锅炉建模仿真的参考模型。

Dynamic Simulation of Natural Circulation HRSG

A natural circulation HRSG dynamic model is was developed, which was important in studying the dynamic behaviors of HRSG. With introducing the technique of combining the drag model and volume model, more reasonable model divide method was proposed. Thus the models were easier to connect. Based on the mechanism of HRSG, the working medium under the water-level of the drum was lumped as a lumped system with dynamic dryness. Subsequently, the complex of drum model was alleviated. Dynamic responses of HRSG were numerically simulated when gas turbine and steam turbine were under off-design condition. Theoretical analyses show that the simulation results are reasonable and the model can satisfy dynamic simulation for large load change. It is believed that the result in this work is valuable in proposing a reference for similar research.