摘要
针对火电站实际系统部分流体在流动过程中密度变化大的特点 ,从基本物理定律出发 ,介绍了可压缩流体网络的建模方法。考虑了蒸汽、空气、烟气等流体的不同物性、蒸汽在膨胀中湿度变化、散热、摩阻的影响、风机低流量的稳定性和引风系统中煤粉浓度、烟气温度对导纳的影响。该模型已用于大型火电机组的风烟系统和主蒸汽系统的实时仿真。仿真结果表明 :模型准确有效地仿真风烟系统和主蒸汽系统的动静态特性 ,与现场的试验纪录保持一致。该模型适用于电站风烟系统、主蒸汽系统等可压缩流体的全工况实时仿真。图 2参
According to the characteristics of the varying density of fluids in a fossil power plant, this paper endeavored to apply the advanced tool, compressible fluid flow network, to the modeling method is proposed. Pressure, flow rate are dynamically calculated based on the continuity equation, ideal gas law or steam properties, momentum balance equation and energy balance equation. The effects of the moisture content, heat leadage and loss of friction of steam expansion in turbines, the low flow rate of air/flue gas in forced/induced fans and the concentration of the coal dust in the primary air are also considered. The model is used for the real time simulation of the main steam system and air/flue gas system for modern power units. Simulation result shows that the model can give high accuracy for steady state and the observable change in the parameters can correspond in direction to record curves for the reference plant transient. The model can be used for fossil power units covering the entire operatin range from zero to full load. Figs 2 and refs 8.
出处
《动力工程》
CSCD
北大核心
2002年第6期2119-2122,共4页
Power Engineering
