發(fā)布時間：2018-01-13 02:14

  本文關(guān)鍵詞：氣液反應(yīng)體系相界面?zhèn)髻|(zhì)強化研究　出處：《化學(xué)工程》2016年03期 　論文類型：期刊論文

  更多相關(guān)文章： 多相反應(yīng)體系 界面?zhèn)髻|(zhì) 過程強化

【摘要】：氣液反應(yīng)界面?zhèn)髻|(zhì)的強化是當今高效和節(jié)能反應(yīng)器研究的重要課題,弄清反應(yīng)器內(nèi)的氣液傳質(zhì)機理是對氣液反應(yīng)器進行數(shù)學(xué)描述的關(guān)鍵。反應(yīng)過程的能效和物效與體系中的傳質(zhì)系數(shù)k_G,k_L,k_S以及相界面面積a等參數(shù)直接相關(guān),這些參數(shù)受氣泡尺寸、分布、表觀氣速和氣含率等因素的制約。就確定的體系和反應(yīng)條件而言,這些因素會因反應(yīng)器的結(jié)構(gòu)尤其是攪拌和混合方式的變化而異。文章從理論上分析了影響氣液界面?zhèn)髻|(zhì)的各因素,建立了較為詳細的理論模型。理論計算結(jié)果表明:氣泡大小是影響氣液界面?zhèn)髻|(zhì)和最終反應(yīng)速率的重要流體力學(xué)參數(shù),微米級氣泡對反應(yīng)過程的強化作用明顯。能量耗散率是決定體系氣泡大小的深層原因,強化氣液反應(yīng)器設(shè)計時應(yīng)重點考慮。
[Abstract]:The enhancement of gas-liquid reaction interface mass transfer is an important subject in the research of high efficiency and energy saving reactors. Understanding the gas-liquid mass transfer mechanism in the reactor is the key to the mathematical description of the gas-liquid reactor. The energy efficiency and material efficiency of the reaction process and the mass transfer coefficient KGG / KL in the system are discussed. The parameters KS and interface area a are directly related, and these parameters are restricted by the bubble size, distribution, apparent gas velocity and gas holdup, etc. In terms of the determined system and reaction conditions. These factors will vary depending on the structure of the reactor, especially the mixing and mixing modes. In this paper, the factors affecting the mass transfer at the gas-liquid interface are analyzed theoretically. A detailed theoretical model is established. The theoretical calculation results show that the bubble size is an important hydrodynamic parameter affecting the mass transfer and the final reaction rate of the gas-liquid interface. The energy dissipation rate is the deep reason that determines the bubble size of the system, which should be considered in the design of the enhanced gas-liquid reactor.
【作者單位】： 南京大學(xué)化學(xué)化工學(xué)院;南京大學(xué)醫(yī)學(xué)院附屬鼓樓醫(yī)院;
【基金】：國家自然科學(xué)基金資助項目(21306078;21476105;91434101)
【分類號】：TQ021.4
【正文快照】： 氣液固多相反應(yīng)體系在化工、食品、制藥、能源、環(huán)保等過程工業(yè)中應(yīng)用極其廣泛。但無論是傳質(zhì)分離過程還是化學(xué)反應(yīng)過程,多相流體間的相界面積都是影響甚至決定過程效率的重要參數(shù)�？傮w而言,相界面積既與反應(yīng)的調(diào)控參數(shù),即與反應(yīng)器的結(jié)構(gòu)(攪拌方式等)和操作條件(溫度、壓力、，

本文編號：1416995