Research on varying condition characteristic of feedwater heater considering liquid level
Research on varying condition characteristic of feedwater heater considering liquid level
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DOI：
10.1016/j.applthermaleng.2014.02.034
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发表时间：
2014-06
影响因子：
6.4
通讯作者：
Jian-qun Xu;Tao Yang;Youcheng Sun;K. Zhou;Y. Shi
中科院分区：
文献类型：
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作者：
Jian-qun Xu;Tao Yang;Youcheng Sun;K. Zhou;Y. Shi
本文在因次分析的基础上，建立了三段加热器变工况数学模型，并结合疏水冷却器段传热系数的推导，提出了低液位下加热器的运行特性模型。以某330 MW涡轮机#1高压给水加热器为例，利用该模型分别计算了正常液位和低液位时的端差以及低液位时疏水冷却器段传热状况的变化。通过与试验数据的比较，验证了模型的准确性。此外，定量分析了液位和负荷对端差的影响，并对安全液位和经济液位进行了重新设置。结果表明，该研究可为实际运行中液位的及时调整提供参考。
In this paper, a mathematical model of varying condition is established for the three-section heater based on dimensional analysis, then with the combination of the derivation of heat transfer coefficient in the drain cooler section, the model of operating characteristic for the heater at low liquid level is proposed. Taking #1 high pressure feedwater heater of a 330 MW turbine as example, the terminal temperature difference at both normal liquid level and low liquid level and the change of the heat transfer condition in the drain cooler section at low liquid level can be calculated respectively by the proposed model. By comparison with the test data the accuracy of the model is verified. In addition, the influence of liquid level and load on terminal temperature difference is analyzed quantitatively, and the secure liquid level and economic liquid level are reset. The results show that the study can provide a reference for the timely adjustment of the liquid level in actual operation.