本文選題：旋轉(zhuǎn)床 + 液膜控制　； 參考：《北京化工大學(xué)》2015年碩士論文

【摘要】：本文以臥式旋轉(zhuǎn)填充床作為實(shí)驗(yàn)設(shè)備,分別考察了液膜控制體系與氣膜控制體系下,空腔區(qū)與整床的傳質(zhì)情況,空腔區(qū)占整床的傳質(zhì)比例,轉(zhuǎn)速液量和溫度等變量對(duì)實(shí)驗(yàn)結(jié)果的影響。對(duì)于NaOH吸收CO2體系,隨著轉(zhuǎn)速的增加,整床的CO2脫除率先迅速增加,又有所降低；空腔區(qū)的CO2脫除率隨著轉(zhuǎn)速的增加而增大。隨著液體流量的增加,空腔區(qū)和整床的CO2脫除率均有所提高。溫度對(duì)于整床和空腔區(qū)的CO2脫除率影響不大�？涨粎^(qū)占整床的傳質(zhì)比例為23%-29%。對(duì)于MDEA吸收CO2體系,空腔區(qū)占整床傳質(zhì)比例為29%-33%。即對(duì)于液膜控制體系,空腔區(qū)所占傳質(zhì)比例約為整床的1/4,傳質(zhì)的主要部分發(fā)生在填料區(qū)。對(duì)于水吸收NH3體系,實(shí)驗(yàn)測(cè)得空腔區(qū)占整床的傳質(zhì)比例大約為82%,這一比例隨轉(zhuǎn)速、氣相流量、液相流量和溫度的變化而基本不變。即空腔區(qū)占到整床傳質(zhì)的大部分比例,這證明了氣相端效應(yīng)區(qū)(外端效應(yīng)區(qū))的存在,以及其對(duì)氣膜控制體系傳質(zhì)的巨大貢獻(xiàn)。將液相為氨水時(shí)空腔區(qū)的NH。吸收率與液相為清水時(shí)整床的NH。吸收率進(jìn)行對(duì)比,消除了液相濃度梯度對(duì)實(shí)驗(yàn)結(jié)果的影響,空腔區(qū)的傳質(zhì)仍然占到整床傳質(zhì)的大部分比例。對(duì)于水吸收NH3體系,空腔區(qū)的氣相體積總傳質(zhì)系數(shù)KGa要大于整床的氣相體積總傳質(zhì)系數(shù)KGa,空腔與整床的氣相體積總傳質(zhì)系數(shù)KGa隨著氣量的增大而大幅增加。液相流量的增大使空腔區(qū)與整床的NH。吸收速率均增加,相應(yīng)氣相體積總傳質(zhì)系數(shù)KGa也增加。溫度的升高使空腔與整床的NH。吸收率和氣相體積總傳質(zhì)系數(shù)KGa均降低。
[Abstract]:In this paper, the mass transfer between the cavity area and the whole bed in the liquid film control system and the gas film control system is investigated with the horizontal rotating packed bed as the experimental equipment, and the mass transfer ratio of the cavity area to the whole bed is investigated. The effect of the speed of liquid and temperature on the experimental results. For NaOH CO2 absorption system, with the increase of rotating speed, the CO2 removal rate of the whole bed increases rapidly and then decreases, and the removal rate of CO2 in the cavity increases with the increase of rotational speed. With the increase of liquid flow rate, the removal rate of CO _ 2 in the cavity and in the whole bed increased. The temperature has little effect on the removal rate of CO2 in the whole bed and cavity. The mass transfer ratio of the cavity area to the whole bed was 23-29. For MDEA CO2 absorption system, the mass transfer ratio between the cavity area and the whole bed is 29- 33. For the liquid membrane control system, the proportion of mass transfer in the cavity is about 1 / 4 of that in the whole bed, and the main part of the mass transfer occurs in the packing area. For the system of water absorption of NH _ 3, the mass transfer ratio of the cavity area to the whole bed is about 82%, which is basically unchanged with the changes of rotational speed, gas flow rate, liquid flow rate and temperature. That is, the cavity area accounts for most of the mass transfer in the whole bed, which proves the existence of the gas phase end effect region (the outer end effect region) and its great contribution to the mass transfer of the film control system. The liquid phase was transformed into NH in the spatiotemporal cavity region of ammonia water. When the absorptivity and liquid phase are pure water, the NH of the whole bed is obtained. The absorption rate was compared and the effect of liquid concentration gradient on the experimental results was eliminated. The mass transfer in the cavity still accounted for most of the mass transfer in the whole bed. For NH _ 3 absorption system, the gas phase mass transfer coefficient KGa in the cavity region is larger than that in the whole bed, and the gas phase volume mass transfer coefficient KGa between the cavity and the whole bed increases greatly with the increase of gas volume. The increase of liquid flow rate makes the cavity area and the whole bed NH. The absorption rate increases and the mass transfer coefficient KGa increases. The increase of temperature makes the cavity and the whole bed NH. Both the absorptivity and the mass transfer coefficient KGa decreased.
【學(xué)位授予單位】：北京化工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ021.4

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本文編號(hào)：2076365