直流锅炉蒸汽压力与中间点温度耦合特性分析

发布时间：2018-08-20 13:01

【摘要】：汽轮机调门开度扰动实验得到的超临界直流炉蓄热系数其数值明显小于锅炉设计参数的计算值和直接能量平衡协调控制系统的调试值。分析发现,直流炉与汽包炉蓄热利用的机制存在差异:直流炉压力变化时只能利用汽水部分蓄热,中间点温度变化时才能利用金属部分蓄热。将直流炉汽水系统横向划分为传热区和容积区,分别建立传热区金属与容积区汽水蓄热过程能量平衡方程,可建立微分方程形式的直流炉汽水系统核心模型,也能籍此定量分析蒸汽压力与中间点温度的耦合特性。将机组实际燃料量给水流量汽轮机高调阀开度引入模型,变工况下中间点温度机前压力发电负荷模型输出值与机组实际值很好吻合,显示模型有足够的准确度。
[Abstract]:The heat storage coefficient of supercritical direct current furnace is obviously smaller than the calculated value of boiler design parameters and the adjustment value of direct energy balance coordinated control system. It is found that the mechanism of heat storage and utilization of direct current furnace and drum furnace is different: when the pressure of direct current furnace is changing, only the steam water part can be used to store heat, and the metal part can be used only when the temperature of the middle point changes. The heat transfer zone and volume region are divided into heat transfer zone and volume zone respectively. The energy balance equations of steam water storage process in heat transfer zone and volume region are established, and the core model of direct current furnace steam water system in the form of differential equation can be established. It can also be used to quantitatively analyze the coupling characteristics of steam pressure and intermediate temperature. The model is introduced into the model by introducing the actual fuel quantity and feed water flow rate of the turbine into the model. The output value of the model is in good agreement with the actual value of the generating unit under variable working conditions, and the output value of the model is in good agreement with the actual value of the generating unit. The display model has sufficient accuracy.
【作者单位】：华北电力大学;
【基金】：国家重点基础研究发展计划项目(973计划)(2012CB215203) 中央高校基本科研业务费专项资金项目(2014MS145)~~
【分类号】：TM621.2

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