超臨界鍋爐啟動汽水分離器應(yīng)力分析及數(shù)值模擬
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- 文章編號: 10006761( 2007) 06 868 04
超臨界鍋爐啟動汽水分離器應(yīng)力分析及數(shù)值模擬
劉 彤, 史 飛, 孫保民, 黃其勵
(華北電力大學(xué) 能源與動力工程學(xué)院;電站設(shè)備狀態(tài)監(jiān)測與控制教育部重點實驗室, 北京 102206)
摘 要: 對超臨界鍋爐汽水分離器變工況下的應(yīng)力場進(jìn)行了分析計算, 探討了在高溫高壓條件下
蠕變變形與應(yīng)力間的關(guān)系, 以及存在彈性變形、 塑性變形和蠕變變形時應(yīng)力的計算, 并使用
ANASYS 對某超臨界鍋爐汽水分離器進(jìn)行了數(shù)值模擬。結(jié)果表明: 在結(jié)構(gòu)不連續(xù)處, 即汽水分離器
入口附近, 局部應(yīng)力最大;在機(jī)組啟動初始階段,此處的應(yīng)力幅很大; 而在穩(wěn)定運行時,此處的應(yīng)力
絕對值很大,但震蕩幅度很小。
關(guān)鍵詞: 能源與動力工程;鍋爐; 汽水分離器;蠕變;棘輪現(xiàn)象; 數(shù)值模擬
中圖分類號: TK223. 4 文獻(xiàn)標(biāo)識碼: A
Stress Analysis and Simulation of a Supercritical Boiler s
Starting Water Separator
LIU Tong , SHI Fe i , SU N Baomin, HU ANG Qili
( MOE s Key Lab of Power Equipment s State Monitoring and Control, Col lege of Energy and Po wer
Engineering, North China Universi ty of Electric Power, Bei jing 102206, China)
Abstract: The s tres s field in a supercri tical boi ler s water separator, under varying operating condi t ions, is calculated
and analyzed. The relationship between creep and stress at high temperature is discussed toge ther with s tres s calculations
under the condi t ion of coe xis t ing elas t ic s train, plas tic strain and creep. The water separator of a certain supercri t ical
boiler has been numerically simulated with ANASYS. Results indicate tha t local stress is larges t at places, where the
structure ge ts discont inuous, i. e. in the vicini ty of the separator s inlet. The s tress ampl itude gets very large during the
f i rst stage of starting, whi le during steady operation, i t is the absolute value of s tres s that gets very large, with but very
smal l vaci llations.
Key words: energy and power engineering; boi ler; water separator; creep; phenomenon of ratchet wheel; numerical
simulat ion
收稿日期: 2006 12 10
作者簡介: 劉 彤( 1963 ) , 女, 教授, 研究方向為: 鍋爐壽命監(jiān)測
和管理、 鍋爐整體 CAD開發(fā)及利用。
超臨界電站鍋爐中汽水分離器長期工作在高
溫、 高壓的惡劣環(huán)境下,承受壓力和溫度的持續(xù)作用
和周期性交變作用, 會產(chǎn)生疲勞、 蠕變及其它們之間
的交互作用。由于難于更換, 其壽命也就影響了鍋
爐的整體壽命。因此, 通過從 DCS 系統(tǒng)獲得的溫
度、 壓力、 負(fù)荷等簡單參數(shù), 分析汽水分離器的應(yīng)力
情況,并通過數(shù)值模擬變工況下的應(yīng)...
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