Leakage of high pressure ammonia preheater pipe and ellipsoidal head in the joint production of melamine with urea is introduced , hazard and reasons of leakage are analyzed to put forward the methods for prevention of similar accidents 摘要介紹了三聚氰胺尾氣聯(lián)產(chǎn)尿素裝置的高壓氨預(yù)熱器列管及封頭發(fā)生泄漏的情況,分析了泄漏產(chǎn)生的危害及原因,提出了防止類似事故發(fā)生的方法。
Abstract : based on the basic concept of the revolving shell , the equation of the middle surface generatrix of the approximate ellipsoid portion of the ellipsoidal head is derived , the unwrapped area and the unwrapped diameter of the ellipsoidal head are calculated , the result is compared with that of derived from the real ellipsoid and that of calculated from the empirical equation , relative chart and code are given out , which could be used by manufactures for reference 文摘:根據(jù)回轉(zhuǎn)殼體的基本概念,推導(dǎo)了橢圓封頭的近似橢圓殼部分的中面母線方程,據(jù)此推導(dǎo)計算了橢圓封頭的展開面積及展開圓直徑,并根據(jù)橢圓殼幾何形狀推導(dǎo)的結(jié)果與經(jīng)驗公式所得結(jié)果進(jìn)行了比較,給出了有關(guān)圖表及計算程序,可供制造單位參考使用。