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高溫高壓反應釜放熱反應的穩定性

來(lái)源: 時(shí)間:2013-10-14 14:49:58 瀏覽次數:

在某些情況下,對連續攪拌釜式高溫高壓反應釜中進(jìn)行放熱反應所作的物料衡算和熱量衡算式,是怎樣出現三個(gè)交點(diǎn)的。這三個(gè)交點(diǎn)的中間一個(gè)代表不穩定態(tài),只要和礴點(diǎn)稍有偏離,系統便會(huì )向二個(gè)穩定態(tài)c點(diǎn)或e點(diǎn)移動(dòng)。
在某些情況下,對連續攪拌釜式高溫高壓反應釜中進(jìn)行放熱反應所作的物料衡算和熱量衡算式,是怎樣出現三個(gè)交點(diǎn)的。這三個(gè)交點(diǎn)的中間一個(gè)代表不穩定態(tài),只要和礴點(diǎn)稍有偏離,系統便會(huì )向二個(gè)穩定態(tài)c點(diǎn)或e點(diǎn)移動(dòng)。
這種存在有穩定態(tài)的反應系統,根本的是在交點(diǎn)處移熱曲線(xiàn)的斜率應大于放熱曲線(xiàn)的斜率。這個(gè)條件在第八章內曾已述及,對穩一定性來(lái)說(shuō)它是一個(gè)必要條件,但不是充分條件。
在某些情況下,對連續攪拌釜式高溫高壓反應釜來(lái)說(shuō),例如在交點(diǎn)e處會(huì )顯示出振蕩型的不穩定性。在絕熱操作時(shí),亦即沒(méi)有傳熱項時(shí),上述情況就不會(huì )發(fā)生柳。但當濃度和溫度的變化不協(xié)調時(shí),這種情況還會(huì )發(fā)生。對運轉中的設備來(lái)說(shuō),振幅的不斷增大,顯然是不能容許的事。這種振蕩的范圍若比鋅窄時(shí),通??砂炊ǔB(tài)時(shí)的線(xiàn)性.問(wèn)題來(lái)處理,而當振蕩變得很大時(shí),它的型式就要按非線(xiàn)性問(wèn)題來(lái)處理。
在實(shí)際上,重要的問(wèn)題是在特定的環(huán)澳下,這種振蕩究競是否會(huì )發(fā)生。
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