• 作者： Liu, Tuan-Chi; Song, Loong-Yue
• 中文摘要： 本研究以石英管反應器探討鐵粉中殘存碳之去除問題,殘存碳是與二氧化碳反應後生成一氧化碳而被除去,實驗是在常壓下進行,反應溫度在893至923K之間,二氧化碳之分壓在 0.1至0.4氣壓之間,鐵粉粒徑為40至200mesh,在反應時鐵粉被脫碳及被氧化之情形可由反應釋出氣中碳及氧之原子數目變化情形測得,結果顯示鐵粉會先進行脫碳反應然後才會被氧化。本研究同時推導了兩個反應模式,其中晶核(nucleation)模式可用來預估低脫碳率(<30%)時之脫碳行為,在高脫碳率(>50%)時則另推導出改良之縮核(shrinking core)模式來描述鐵粉之脫碳行為。
• 英文摘要： The removal of the residual carbon in iron powder in a quartz tube reactor was studied. The carbon was removed as CO by reacting it with CO/sub 2/. The experiments were performed under atmospheric pressure with a temperature between 893-923K, CO/sub 2/ partial pressure between 0.1-0.4atm, and particle size between 40-200mesh. The changes of atomic number of carbon and oxygen in the gas phase during the reaction were used to distinguish the decarburization and oxidation of the powder. The results revealed that carbon removal occurs before iron oxidation. Two models, nucleation model and modified shrinking core model, were developed for the decarburization. The nucleation model is for low level (<30%) of carbon removal, and the modified shrinking core model is for high level(>50%) of carbon removal.
• 中文關鍵字： 殘存碳; 鐵粉; 動力模型; 二氧化碳; 晶核模式
• 英文關鍵字： Residual Carbon; Iron Powder; Kinetic Model; Carbon Dioxide; Nucleation Model