沼气水洗提纯吸收塔的体积吸收系数研究
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摘要
文章以设计处理量为25 m~3/h的沼气压力水洗提纯装置为实验对象,研究了温度、压力、液气比、进气量和浓度等参数对提纯气CO_2浓度和吸收塔平均体积吸收系数KYa的影响,并提出了优化的操作参数条件。沼气提纯过程具有高浓度和高液气比的特点,文章分析了高CO_2浓度下的KYa理论计算公式,建立了以液、气相速度比UL/UG为基础的KYa数学模型,该模型和实验数据的偏差为-22%～17%。该模型既强调了沼气提纯过程具有高液气比的特点,又为沼气水洗提纯技术提供了合理的吸收性能分析经验公式,具有重要的工程价值。
Experimental installation for water scrubbing biogas upgrading with 25 m~3/h design capacity is set up. The influences of temperature, pressure, liquid-gas ratio, inlet gas flow and inlet gas concentration on CO_2 concentration in upgraded gas and volumetric average absorption coefficient KYa in absorption tower are studied, and optimal operating conditions are given.Absorptionhas the characteristics of high concentration and high liquid-gas ratio. The theoretical calculation formula of KYa for high CO_2 gas concentration is analyzed. Mathematical model for KYa is based on velocity ratio of liquid to gas phase UL/UG, and deviation between model and experiment is between-22%～17%. The model emphasizes high liquid-gas ratio characteristic, and it also provides a reasonable empirical formula of absorption performance for water scrubbing biogas upgrading, which is of great significance in engineering application.
Experimental installation for water scrubbing biogas upgrading with 25 m~3/h design capacity is set up. The influences of temperature, pressure, liquid-gas ratio, inlet gas flow and inlet gas concentration on CO_2 concentration in upgraded gas and volumetric average absorption coefficient KYa in absorption tower are studied, and optimal operating conditions are given.Absorptionhas the characteristics of high concentration and high liquid-gas ratio. The theoretical calculation formula of KYa for high CO_2 gas concentration is analyzed. Mathematical model for KYa is based on velocity ratio of liquid to gas phase UL/UG, and deviation between model and experiment is between-22%～17%. The model emphasizes high liquid-gas ratio characteristic, and it also provides a reasonable empirical formula of absorption performance for water scrubbing biogas upgrading, which is of great significance in engineering application.
引文
[1]周宗茂,谢丽,罗刚,等.厌氧发酵沼气提纯技术研究进展[J].环境工程,2013,31(3):46-50.
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[5]韩文彪,王毅琪,徐霞,等.沼气提纯净化与高值利用技术研究进展[J].中国沼气,2017,35(5):57-61.
[6]宫徽,徐恒,左剑恶,等.沼气精制技术的发展与应用[J].可再生能源,2013,31(5):103-108.
[7]LǎntelǎJ,Rasi S,Rintala J,et al.Landfill gas upgrading with pilot-scale water scrubber:Performance assessment with absorption water recycling[J].Applied Energy,2012,92:307-314.
[8]金付强,张晓冬,许海鹏,等.加压水洗沼气脱碳的实验研究[J].可再生能源,2016,34(11):1720-1726.
[9]丁忠伟,刘伟,刘丽英.化工原理[M].北京:高等教育出版社,2014.
[10]郭绪强,张连生,沈复.填料床层的负荷性能图及绘制[J].化工工程,1998,26(1):15-17.
[11]孙津生,黄洁,周勇,等.规整填料的操作弹性和负荷性能图[J].石油化工,2000,29:125-130.
[12]NY/T 667-2011,沼气工程规模分类[S].
[13]GB18047-2017,车用压缩天然气[S].
[14]Kreangkrai M,Raphael OI,Paitoon T,et al.Comparative mass transfer performance studies of CO2absorption into aqueous solutions of DEAB and MEA[J].Industrial&Engineering Chemistry Research,2010,49:2857-2863.
[15]Hairul N A H,Azmi M S,Lian S T,et al.Mass transfer performance of CO2absorption from natural gas using monoethanolamine(MEA)in high pressure operations[J].Industrial&Engineering Chemistry Research,2015,54:1675-1680.
[16]贾绍义,胡晖,李杰,等.塑料扁环填料流体力学及传质性能的研究[J].化学工业与工程,2000,17(4):198-203.
[17]宋新月,孙兰义,费维扬,等.用于高液气比吸收过程的填料优选和数学模型的研究[J].化工进展,2002,21(S1):62-65.
[18]刘畅,马春燕,陆小华.大中型沼气工程高压水洗提纯工艺的模拟[J].可再生能源,2014,32(7):1028-1032.
[2]Weiland P.Biogas production:Current state and perspectives[J].Applied Microbiology Biotechnology,2010,85:849-860.
[3]Xu Yajing,Huang Ying,Wu Bin,et al.Biogas upgrading technologies:Energetic analysis and environmental impact assessment[J].Chinese Journal of Chemical Engineering,2015,23:247-254.
[4]郑戈,张全国.沼气提纯生物天然气技术研究进展[J].农业工程学报,2013,29(17):1-8.
[5]韩文彪,王毅琪,徐霞,等.沼气提纯净化与高值利用技术研究进展[J].中国沼气,2017,35(5):57-61.
[6]宫徽,徐恒,左剑恶,等.沼气精制技术的发展与应用[J].可再生能源,2013,31(5):103-108.
[7]LǎntelǎJ,Rasi S,Rintala J,et al.Landfill gas upgrading with pilot-scale water scrubber:Performance assessment with absorption water recycling[J].Applied Energy,2012,92:307-314.
[8]金付强,张晓冬,许海鹏,等.加压水洗沼气脱碳的实验研究[J].可再生能源,2016,34(11):1720-1726.
[9]丁忠伟,刘伟,刘丽英.化工原理[M].北京:高等教育出版社,2014.
[10]郭绪强,张连生,沈复.填料床层的负荷性能图及绘制[J].化工工程,1998,26(1):15-17.
[11]孙津生,黄洁,周勇,等.规整填料的操作弹性和负荷性能图[J].石油化工,2000,29:125-130.
[12]NY/T 667-2011,沼气工程规模分类[S].
[13]GB18047-2017,车用压缩天然气[S].
[14]Kreangkrai M,Raphael OI,Paitoon T,et al.Comparative mass transfer performance studies of CO2absorption into aqueous solutions of DEAB and MEA[J].Industrial&Engineering Chemistry Research,2010,49:2857-2863.
[15]Hairul N A H,Azmi M S,Lian S T,et al.Mass transfer performance of CO2absorption from natural gas using monoethanolamine(MEA)in high pressure operations[J].Industrial&Engineering Chemistry Research,2015,54:1675-1680.
[16]贾绍义,胡晖,李杰,等.塑料扁环填料流体力学及传质性能的研究[J].化学工业与工程,2000,17(4):198-203.
[17]宋新月,孙兰义,费维扬,等.用于高液气比吸收过程的填料优选和数学模型的研究[J].化工进展,2002,21(S1):62-65.
[18]刘畅,马春燕,陆小华.大中型沼气工程高压水洗提纯工艺的模拟[J].可再生能源,2014,32(7):1028-1032.