發(fā)布時(shí)間：2018-05-21 11:17

  本文選題：金屬套管式微通道反應(yīng)器 + 乙二胺四乙酸亞鐵絡(luò)合物　； 參考：《北京化工大學(xué)》2015年碩士論文

【摘要】：一氧化氮(NO)的過量排放會(huì)導(dǎo)致地面臭氧層(對(duì)流層)濃度升高、煙霾、全球變暖等問題,對(duì)人類健康和環(huán)境的危害巨大。目前,許多方法已被用于NO的脫除,其中,濕法脫硝受到了研究者的廣泛關(guān)注。過渡金屬絡(luò)合物作為吸收劑用于NO脫除,此過程具有反應(yīng)速率高,且再生性好的特點(diǎn)。但是,在傳統(tǒng)反應(yīng)器中,其吸收速率通常受傳質(zhì)過程控制。本論文采用自主設(shè)計(jì)和研發(fā)的金屬套管式微通道為氣液傳質(zhì)強(qiáng)化反應(yīng)器,以乙二胺四乙酸亞鐵絡(luò)合物(Fe(II)EDTA)和六氨合鈷(Co(NH3)6Cl2)為吸收劑,開展了NO的脫除過程研究。全文的主要研究?jī)?nèi)容如下：1.在金屬套管式微通道反應(yīng)器內(nèi),采用Fe(Ⅱ)EDTA為吸收劑,考察了吸收液pH、濃度、氣液流量比、氣液流速以及微通道結(jié)構(gòu)尺寸等參數(shù)對(duì)NO脫除率的影響,得到了較優(yōu)脫除工藝條件。研究發(fā)現(xiàn),NO脫除率隨著Fe(Ⅱ)EDTA溶液的pH逐漸升高,呈現(xiàn)先升高再降低的趨勢(shì),pH為7時(shí)脫除率最高；NO脫除率隨溫度的升高而降低;固定氣液流量比,同時(shí)增加氣體和液體流量,NO脫除率先增高后降低;隨著微孔孔徑和套管環(huán)隙尺寸的增大,NO脫除率明顯降低。當(dāng)Fe(Ⅱ)EDTA濃度為0.04mol/L,套管內(nèi)氣液流量比為32,反應(yīng)溫度為293 K,套管微孔孔徑為10μm,套管環(huán)隙尺寸為250μm時(shí),NO脫除率可達(dá)到95%。2.進(jìn)一步采用Co(NH3)6Cl2為吸收劑,研究了各個(gè)反應(yīng)參數(shù)條件對(duì)NO脫除率的影響規(guī)律。研究結(jié)果表明,六氨合鈷脫除NO的規(guī)律與Fe(Ⅱ)EDTA為吸收劑時(shí)基本相同,但其脫除效果略差于Fe(Ⅱ)EDTA,在較優(yōu)脫除條件下,Co(NH3)6Cl2的NO脫除率為85%。3.基于Fe(Ⅱ)EDTA脫除NO過程,采用雙膜理論,研究了套管式微通道反應(yīng)器內(nèi)氣液傳質(zhì)過程,推導(dǎo)并計(jì)算了套管式微通道反應(yīng)器內(nèi)吸收NO的體積傳質(zhì)系數(shù)(KLa)。重點(diǎn)考察了各個(gè)反應(yīng)條件參數(shù),包括套管內(nèi)氣液流速、氣液流量比、反應(yīng)溫度、套管結(jié)構(gòu)尺寸等對(duì)KLa的影響。套管式微通道反應(yīng)器內(nèi)氣體和液體流量的增加會(huì)強(qiáng)化傳質(zhì)。隨著套管微孔孔徑及套管環(huán)隙尺寸的增加,KLa逐漸降低。KLa會(huì)隨著反應(yīng)溫度的降低、吸收液濃度的升高而升高。此外,套管內(nèi)氣液流量比的增加會(huì)促進(jìn)傳質(zhì),使得KLa升高。
[Abstract]:The excessive emission of nitric oxide (no) will lead to the increase of ground ozone layer (troposphere) concentration, haze, global warming and so on, which will cause great harm to human health and the environment. At present, many methods have been used to remove no. Among them, wet denitrification has been widely concerned by researchers. The transition metal complex is used as absorbent for no removal. This process is characterized by high reaction rate and good regeneration. However, in conventional reactors, the absorption rate is usually controlled by mass transfer processes. In this paper, the removal process of no was studied by using the metal-tube microchannel designed and developed by ourselves as gas-liquid mass transfer enhanced reactor, using EDTAA and CoNH3Cl2 as absorbent. The main contents of this paper are as follows: 1. In a metal tube microchannel reactor, the effects of pH, concentration, gas-liquid flow ratio, gas-liquid flow rate and structure size of microchannel on the removal rate of no were investigated by using Fe (鈪，

本文編號(hào)：1918981