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其有恒定進(jìn)料的完全混和系統

來(lái)源: 時(shí)間:2013-10-30 16:44:49 瀏覽次數:

作為第一個(gè)例子,我們將考慮某一具有恒定的新鮮反應物進(jìn)料的系統,該系統內能夠維持在一個(gè)恒定的溫度T,由于很好的混和,在實(shí)驗室反應釜內溫度到處是均一的,這就是連續攪拌釜式實(shí)驗室反應釜中所具有的情況。
作為個(gè)例子,我們將考慮某一具有恒定的新鮮反應物進(jìn)料的系統,該系統內能夠維持在一個(gè)恒定的溫度T,由于很好的混和,在實(shí)驗室反應釜內溫度到處是均一的,這就是連續攪拌釜式實(shí)驗室反應釜中所具有的情況。但是根據這個(gè)簡(jiǎn)單棋型提出的一些問(wèn)題,將有助于洞察更為復雜的系統的熱性能,例.如各種火焰和姍燒室,其中棍合情況也許離開(kāi)完全棍合甚遠。
設總的放熱速率為Q在反應物進(jìn)入反應器的流量為定值時(shí),以Q對溫度T作圖。是由于反應速度常數的增加和反應物濃度的減少對放熱速率具有相反的影響所導致的結果。當系統內的沮度T足夠高時(shí),反應速度常數是如此之大以致在系統出口流中幾乎不再含有未反應的反應物(進(jìn)料流量仍保持相同),因而溫度T的值繼續增大,不會(huì )使Q:值再顯著(zhù)增大,其結果表現為曲線(xiàn)趨于平坦。
如果作出了適當的簡(jiǎn)化假定,該曲線(xiàn)的方程式便能很易獲得。為此,設反應為一級不可逆反應,其反應速度僅與一個(gè)反應物的濃度成正比。
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