两塔变压吸附循环中两步均压的研究
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摘要
为了进一步利用吸附塔产品端的富氧气体,提高氧气回收率,减少单位氧产量的能耗,设计了一种新的两塔变压吸附均压方式,即把均压分为两个小步骤,第一步实现产品端均压,第二步实行产品端与进气端均压,每步均压前有一小段保压时间.为此建立了一套产氧规格为5 Nm3/h的制氧设备对这种均压方式进行详细的研究.试验结果表明:在本文所述试验条件下,当第一次保压时间与第二次保压时间分别为0.3 s和1.2 s,第一步均压时间与第二步均压时间分别为0.5 s和2.4 s,氧气浓度维持在93.5%左右且环境温度与湿度基本不变时,与单纯的产品端均压相比,两步均压使氧气回收率增加了4.9%.采取两步均压方式,吸附阶段吸附塔产品端氧气浓度随时间非常缓慢地减少,27 s时间内氧气浓度下降值仅为0.61%,形成了类似于激波的浓度波,产品氧气的浓度非常稳定.
In order to use the oxygen enriched gas of the product end,improve oxygen recovery,reduce energy consumption,we designed a new two-bed pressure swing adsorption pressure equalization step. It was divided into two phases,the first stage was to made the oxygen enriched gas enter the product end of the low pressure bed and the second process was to made the oxygen enter into the feed end of the low pressure bed from the product end of the high pressure bed. Additionally,a 5 Nm3/ h oxygen equipment was built to study the two-stage pressure equalization step. The research results showed that when two phases were 0. 5 s and 2. 4 s lasted respectively and before every stage there was a dwell time and the first time was 0. 3 s and the second time was 1. 2 s and the oxygen concentration was about 93. 5%,the oxygen recovery using the two-stage pressure equalization step was 4. 9%higher than that of the product end pressure equalization step. The oxygen concentration in the product end dropped very slowly with a rate of only 0. 61% in 27 s,and a similar sharp-wave can be shaped when the two-stage pressure equalization step was used.
In order to use the oxygen enriched gas of the product end,improve oxygen recovery,reduce energy consumption,we designed a new two-bed pressure swing adsorption pressure equalization step. It was divided into two phases,the first stage was to made the oxygen enriched gas enter the product end of the low pressure bed and the second process was to made the oxygen enter into the feed end of the low pressure bed from the product end of the high pressure bed. Additionally,a 5 Nm3/ h oxygen equipment was built to study the two-stage pressure equalization step. The research results showed that when two phases were 0. 5 s and 2. 4 s lasted respectively and before every stage there was a dwell time and the first time was 0. 3 s and the second time was 1. 2 s and the oxygen concentration was about 93. 5%,the oxygen recovery using the two-stage pressure equalization step was 4. 9%higher than that of the product end pressure equalization step. The oxygen concentration in the product end dropped very slowly with a rate of only 0. 61% in 27 s,and a similar sharp-wave can be shaped when the two-stage pressure equalization step was used.
引文
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[6]KIRKBY N F,HILL B F.Pressure swing adsorption:development of an equilibrium theory[M].New York:Fund of Adsorption,Eng Foundation,1987.
[7]杨健,万康,李华飞.均压方式对微型变压吸附制氧装置的影响[J].化工生产与技术,2012,19(5):43-46,64.
[8]杨彦钢,丁艳宾,马正飞,等.不同均压方式对PSA和VSA空分制氧过程的影响[J].南京工业大学学报,2012,34(4):79-83.
[9]周依风,张京晶.变压吸附制氮机均压方式的研究[J].化工技术与开发,2012,41(10):55-58.
[10]章新波,刘应书,杨雄,等,微型四塔变压吸附制氧实验研究[J].现代化工,2009,29(4):68-71,73.
[2]KAYSER J C,KNAEBEL K S.Integrated steps in pressure swing adsortion cycles[J].Chem Eng Sci,1988,43(11):3015-3022.
[3]ROUSAR I V O,DITLPAVEL.Pressure swing adsorption:analytical solution for optimum purge[J].Chem Eng Sci,1993,48(4):723-734.
[4]KNAEBEL K S,HILL F B.Pressure swing adsorption:development of an equilibrium theory for gas separations[J].Chem Eng Sci,1985,40(12):2351-2360.
[5]MATZ M J,KNAEBEL K S.PSA:effects of incomplete purge[J].Chem Eng Sci,1988,43(6):1486-1492.
[6]KIRKBY N F,HILL B F.Pressure swing adsorption:development of an equilibrium theory[M].New York:Fund of Adsorption,Eng Foundation,1987.
[7]杨健,万康,李华飞.均压方式对微型变压吸附制氧装置的影响[J].化工生产与技术,2012,19(5):43-46,64.
[8]杨彦钢,丁艳宾,马正飞,等.不同均压方式对PSA和VSA空分制氧过程的影响[J].南京工业大学学报,2012,34(4):79-83.
[9]周依风,张京晶.变压吸附制氮机均压方式的研究[J].化工技术与开发,2012,41(10):55-58.
[10]章新波,刘应书,杨雄,等,微型四塔变压吸附制氧实验研究[J].现代化工,2009,29(4):68-71,73.