张良佺,郑猫英,毛琰昊,盖希坤,杨瑞芹,单胜道.热钾碱溶液脱除沼气中CO2反应机制与相际传质研究[J].农业机械学报,2019,50(4):283-289.
ZHANG Liangquan,ZHENG Maoying,MAO Yanhao,GAI Xikun,YANG Ruiqin,SHAN Shengdao.Reaction Mechanism and Interphase Mass Transfer of CO2 from Biogas by Hot Potassium Carbonate Solvent[J].Transactions of the Chinese Society for Agricultural Machinery,2019,50(4):283-289.
摘要点击次数: 1375
全文下载次数: 706
热钾碱溶液脱除沼气中CO2反应机制与相际传质研究   [下载全文]
Reaction Mechanism and Interphase Mass Transfer of CO2 from Biogas by Hot Potassium Carbonate Solvent   [Download Pdf][in English]
投稿时间:2018-09-29  
DOI:10.6041/j.issn.1000-1298.2019.04.032
中文关键词:  沼气  热钾碱  二氧化碳吸收  独立反应  双驱动反应器
基金项目:国家自然科学基金重点项目(U1609214)、浙江省重点研发计划项目(2017C03010)和浙江省废弃生物质循环利用与生态处理技术重点实验室开放基金项目(2016REWB13)
作者单位
张良佺 浙江科技学院 
郑猫英 浙江科技学院 
毛琰昊 浙江科技学院 
盖希坤 浙江科技学院 
杨瑞芹 浙江科技学院 
单胜道 浙江科技学院 
中文摘要:对CO2气液吸收过程进行了化学平衡热力学研究,计算了吸收反应体系的独立反应数,提出了4独立反应理论。根据对独立反应平衡常数的计算,认为H2CO3电离为H+和HCO-3,虽然其平衡常数仅为6.0189×10-7,但由于溶液中CO2-3离子的大量存在,使得H+浓度很低,因此H2CO3电离度不可忽略。在此基础上,提出了CO2气液吸收过程串并联复杂反应机理,认为CO2吸收速率是由其分别与H2O和OH-两条平行反应路线共同决定的。分析了CO2-3离子的关键作用:该离子与H+作用直接促进了CO2吸收过程;由于溶液中H+离子浓度很低,导致OH-离子浓度升高,从而间接加快了CO2与OH-离子之间的反应速率。应用双驱动反应器,采取H2O-CO2体系对气液相际传质过程进行了研究,当气相搅拌转速达到140r/min以上时,气膜传质阻力可忽略不计;通过线性回归分析,关联了液相传质系数与液相搅拌转速之间的关系,得到了回归关联式,计算误差最大值为11.312%,认为关联式真实可靠。
ZHANG Liangquan  ZHENG Maoying  MAO Yanhao  GAI Xikun  YANG Ruiqin  SHAN Shengdao
Zhejiang University of Science and Technology,Zhejiang University of Science and Technology,Zhejiang University of Science and Technology,Zhejiang University of Science and Technology,Zhejiang University of Science and Technology and Zhejiang University of Science and Technology
Key Words:biogas  hot potassium carbonate  carbon dioxide absorption  independent reaction  dual drive reactor
Abstract:Through chemical equilibrium thermodynamics analysis of CO2 gas-liquid absorption process, the number of independent reactions in the absorption reaction system was calculated and a four independent reaction hypothesis was presented. According to the calculation of the independent reaction equilibrium constants, ionization of H2CO3 into H+ and HCO-3 was postulated. Although the equilibrium constant was 6.0189×10-7, the concentration of H+ ions was still very low due to the large presence of CO2-3 ions in the solution, such that the ionization degree of H2CO3 can not be ignored. Moreover, it was proposed that the reaction mechanism of CO2 gas-liquid absorption was a serial parallel complex. The absorption rate of CO2 was believed to be determined by its parallel reactions with H2O and OH-. Meanwhile, the critical roles of CO2-3 ions were analyzed in great detail. Firstly, the interaction between H+ and CO2-3 directly promoted the absorption of CO2;secondly, the concentration of OH- ions in solution was increased as the decrease of concentration of H+ ions. The latter indirectly accelerated the reaction rate between CO2 and OH- ions. A dual drive reactor was used to study the gas liquid mass transfer process in H2O-CO2 system and the main conclusions were as following: when the gas phase stirring rate reached above 140r/min, the mass transfer resistance of the gas film can be negligible;based on the linear regression analysis, the relationship between the liquid mass transfer coefficient and the speed of liquid phase stirring paddle was verified and the regression correlation was obtained. By calculating the residual, the maximum value was 11.312%,and the correlation was considered to be robust.

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.

   下载PDF阅读器