本文關(guān)鍵詞：氣液交叉流脫除亞微米級(jí)顆粒物的研究　出處：《高校化學(xué)工程學(xué)報(bào)》2017年04期 　論文類型：期刊論文

  更多相關(guān)文章： 氣液交叉流系統(tǒng) 亞微米級(jí)顆粒物 脫除效率 理論模型

【摘要】：亞微米級(jí)顆粒是化學(xué)工業(yè)尾氣排放物的重要組成,其脫除效率是影響排放指標(biāo)進(jìn)一步提高的關(guān)鍵。基于顆粒捕獲機(jī)理,建立了氣液交叉流系統(tǒng)脫除效率的理論模型,并對(duì)該系統(tǒng)脫除亞微米級(jí)顆粒的特性進(jìn)行了理論分析和實(shí)驗(yàn)研究。實(shí)驗(yàn)結(jié)果表明,低氣速、高液柱群比表面積、高氣液相溫差有利于提升系統(tǒng)的脫除效率。粒徑0.05~0.6μm,脫除效率隨粒徑的增大呈現(xiàn)先降低后增加的趨勢(shì),與理論值趨勢(shì)一致,表明系統(tǒng)中同時(shí)存在慣性碰撞、攔截、布朗運(yùn)動(dòng)等三種脫除機(jī)理。相對(duì)于理論值,實(shí)驗(yàn)脫除率整體偏大,表明顆粒在高濕環(huán)境中易凝并,有助于顆粒在碰撞和攔截作用下的脫除。由實(shí)驗(yàn)數(shù)據(jù)外推,研究條件下,液柱單元排數(shù)為1300時(shí),亞微米級(jí)顆粒質(zhì)量脫除效率預(yù)計(jì)可達(dá)90%。
[Abstract]:Submicron particles are important components of tail gas emissions from chemical industry. The removal efficiency of submicron particles is the key to the further improvement of emission index based on particle capture mechanism. The theoretical model of the removal efficiency of gas-liquid cross flow system is established, and the characteristics of the system for removing submicron particles are theoretically analyzed and experimentally studied. The experimental results show that the specific surface area of the high liquid column group is high with low gas velocity. The high temperature difference of gas-liquid phase is beneficial to the removal efficiency of the system, and the removal efficiency decreases first and then increases with the increase of the particle size, which is consistent with the theoretical value. The results show that there are three removal mechanisms in the system: inertial collision, interception and Brownian motion. Compared with the theoretical values, the experimental removal rate is relatively large, which indicates that particles are easily condensed in high humidity environment. From the experimental data extrapolated from the experimental data the mass removal efficiency of submicron particles is estimated to reach 90 when the number of liquid column units is 1300.
【作者單位】： 四川大學(xué)化學(xué)工程學(xué)院;維也納技術(shù)大學(xué)化學(xué)工程研究所;
【基金】：國(guó)家國(guó)際科技合作專項(xiàng)資助(2014DFG92250)
【分類號(hào)】：X701
【正文快照】： 2.維也納技術(shù)大學(xué)化學(xué)工程研究所,奧地利維也納1060)隨著城市空氣質(zhì)量問題愈演愈烈,有關(guān)顆粒物排放的國(guó)家標(biāo)準(zhǔn)越發(fā)嚴(yán)格。例如,《硫酸工業(yè)污染物排放標(biāo)準(zhǔn)》中規(guī)定現(xiàn)有企業(yè)顆粒物排放限制值為30 mg·m-3,容易發(fā)生環(huán)境污染特殊區(qū)域顆粒物排放限值為5 mg·m-3[1]。據(jù)統(tǒng)計(jì)[2],我國(guó)

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