晏水平,余歌,浦吉成,周洪亮,贺清尧,王明.沼气中CO2化学吸收传质性能分析与传质系数建模[J].农业机械学报,2018,49(7):311-318.
YAN Shuiping,YU Ge,PU Jicheng,ZHOU Hongliang,HE Qingyao,WANG Ming.Mass Transfer Performance and Modeling of CO2 Chemical Absorption from Simulated Biogas[J].Transactions of the Chinese Society for Agricultural Machinery,2018,49(7):311-318.
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沼气中CO2化学吸收传质性能分析与传质系数建模   [下载全文]
Mass Transfer Performance and Modeling of CO2 Chemical Absorption from Simulated Biogas   [Download Pdf][in English]
投稿时间:2017-11-24  
DOI:10.6041/j.issn.1000-1298.2018.07.037
中文关键词:  沼气提纯  CO2吸收  性能分析  传质系数  数学模型
基金项目:国家自然科学基金项目(51676080)和中央高校基本科研业务费专项资金项目(2015PY077)
作者单位
晏水平 华中农业大学 
余歌 华中农业大学 
浦吉成 华中农业大学 
周洪亮 华中农业大学 
贺清尧 华中农业大学 
王明 华中农业大学 
中文摘要:以气相总体积传质系数为指标,在乱堆鲍尔环填料吸收塔内研究了乙醇胺(MEA)、二乙醇胺(DEA)、三乙醇胺(TEA)和哌嗪(PZ)4种典型吸收剂对模拟沼气中CO2的吸收传质性能,考察了吸收剂浓度、吸收剂温度、吸收剂体积流量、CO2负荷、气体流量与CO2分压的影响,并建立了MEA、DEA和PZ的气相总体积传质系数的计算经验模型。结果表明,相同吸收剂浓度条件下,PZ具有最优的CO2传质性能,MEA和DEA次之,TEA最差。随着吸收剂浓度的增加,除TEA外,其他3种吸收剂的气相总体积传质系数均大幅增加,填料塔出口CO2体积分数大幅下降,且MEA在3.27mol/L时可获得最高的气相总体积传质系数(1.37kmol/(m3·h·kPa));提升吸收剂体积流量、吸收剂温度、气体流量及降低吸收剂初始CO2负荷均可有效增加吸收剂的气相总体积传质系数,但CO2分压变化对气相总体积传质系数影响不显著。最后,建立了MEA、DEA和PZ吸收剂的气相总体积传质系数的计算经验公式,且气相总体积传质系数的试验值与计算值之间的绝对平均误差均小于14%。
YAN Shuiping  YU Ge  PU Jicheng  ZHOU Hongliang  HE Qingyao  WANG Ming
Huazhong Agricultural University,Huazhong Agricultural University,Huazhong Agricultural University,Huazhong Agricultural University,Huazhong Agricultural University and Huazhong Agricultural University
Key Words:biogas upgrading  CO2 absorption  performance analysis  mass transfer coefficient  mathematical model
Abstract:As one of the robust CO2 separation technologies, CO2 chemical absorption method can fully meet the requirement of CO2 capture from biogas, which is deserved to pay more attention. In a chemical absorption process, CO2 absorption always happens in a packed column called CO2 absorber, and therefore the mass transfer performance of CO2 absorption into absorbent is of importance for the design of absorber. However, the study on CO2 mass transfer characteristics and correlations in a packed column under the biogas circumstance is relatively rare. Therefore, the mass transfer performance of CO2 absorption into monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA) and piperazine (PZ) from the simulated biogas was investigated in a random pall ring packed column in terms of the overall gas phase volumetric mass transfer coefficient (KGav). Additionally, the effects of the key operation parameters, including absorbent concentration, temperature, liquid flow rate, CO2 loading, gas flow rate and CO2 partial pressure in gas on KGav values were experimented. Based on these influences, the empirical correlations of the operation parameters on KGav for MEA, DEA and PZ were erected. Results showed that PZ possessed the best CO2 mass transfer performance under the same conditions, followed by MEA, DEA and TEA. With the increase of absorbent concentration, KGav values of MEA, DEA and PZ were risen greatly. Accordingly, CO2 volumetric fractions in the gas exiting the absorber decrease gigantically. If CO2 volumetric fraction of the outlet gas less than 1% was targeted, the concentrations of MEA, DEA and PZ should be increased to 1.38mol/L, 1.43mol/L and 0.88mol/L, respectively. However, the KGav value of TEA was dropped slightly due to the increase of solvent viscosity. Among all the absorbents, MEA achieved the highest KGav value with about 1.37kmol/(m3·h·kPa) at 3.27mol/L. In addition, KGav values of all the absorbents tested were increased with the increase of liquid flow rate, liquid temperature and gas flow rate. However, the initial CO2 loading of absorbent had a negative impact on KGav. It should be noted that the influence of CO2 partial pressure in gas on KGav was not significant. Furthermore, the simplified empirical correlations for KGav as a function of the key operation parameters were proposed for MEA, DEA and PZ, and most of the calculated KGav values were in agreement with the experimental data with an absolute average deviation less than 14%. According to the individual degree of operation parameters on KGav, the rank order was liquid temperature, liquid flow rate, active MEA concentration and gas flow rate for MEA case. As for DEA, active DEA concentration was the most important, followed by liquid flow rate, gas flow rate and liquid temperature. And for PZ, the most important factor was the active PZ concentration, followed by liquid temperature, liquid flow rate and gas flow rate.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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