کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5477214 | 1399215 | 2016 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Online optimal control schemes of inlet steam temperature during startup of steam turbines considering low cycle fatigue
ترجمه فارسی عنوان
طرح های کنترل بهینه آنلاین از دمای بخار ورودی در هنگام راه اندازی توربین های بخار با توجه به خستگی چرخه کم
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کلمات کلیدی
توربین بخار، شروع، استرس حرارتی، خستگی چرخه کم، کنترل بهینه آنلاین،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی (عمومی)
چکیده انگلیسی
Great thermal stresses and fatigue damages will be developed during the startup of steam turbines, which will threaten the safety of operation. To save energy and improve the flexibility of the power unit, inlet steam temperature of steam turbines should be controlled online in an optimal way. A new method to obtain online optimal control schemes of the inlet steam temperature considering low cycle fatigue is presented in this paper using the Green's Function Method and the Pontryagin's Maximum Principle. New analytical models of temperature and thermal stresses are proposed. For a hot startup, constant material properties are used and the steam temperature history that can maintain maximum Von Mises stress close to the permitted value is proved to be the optimal control scheme. For a cold or warm startup, the optimization thermal stress considering temperature dependent material properties is found to be determinated by material properties and Green's functions, which may not be equal to the maximum permitted value. Application of the proposed method to the cold start-up process of a 600Â MW steam turbine is introduced. Compared with the conventional start-up scheduling, the proposed optimal control scheme can shorten the time of startup greatly without exceeding permitted fatigue damage.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Energy - Volume 117, Part 1, 15 December 2016, Pages 105-115
Journal: Energy - Volume 117, Part 1, 15 December 2016, Pages 105-115
نویسندگان
Hengliang Zhang, Danmei Xie, Yanzhi Yu, Liangying Yu,