HCl在乙醇改性的钙基吸附剂表面吸附的动力学研究  

Study on Adsorption Kinetics of HCl on the Surface of Ethanol-modified Calcium Adsorbent

作　　者：左帅 畅巨东 刘猛[2] ZUO Shuai;CHANG Judong;LIU Meng(National Power Investment Group GCL Binhai Power Generation Co.,Ltd.,Yancheng 224500,Jiangsu Province,China;School of Energy and Environment,Southeast University,Nanjing 210096,China)

机构地区：[1]国家电投集团协鑫滨海发电有限公司,江苏盐城224500 [2]东南大学能源与环境学院,南京210096

出　　处：《发电设备》2025年第2期71-78,共8页Power Equipment

基　　金：国家重点研发计划(2022YFB4100301)。

摘　　要：采用乙醇水合改性CaO作为吸附剂,在固定床实验装置上研究不同改性参数对脱氯效果的影响,并且对HCl吸附实验的结果进行动力学分析。运用5种表观动力学模型对实验数据进行非线性拟合。研究结果显示:5种模型的拟合效果优劣顺序为Bangham模型、准二级模型、Elovich模型、准一级模型、颗粒内扩散模型。在HCl吸附过程中,传质扩散始终具有显著影响,为关键控制步骤。在反应初期,表面活性位点未被占据、内部孔道未堵塞时,外部传质过程为主导控制步骤;在反应中期,由于生成产物层堵塞原有发达孔隙结构,颗粒内扩散阻力成为主导HCl吸附的因素。同时,表面化学反应在HCl吸附过程中始终发挥主导作用。Using ethanol hydration modified calcium oxide as the adsorbent,the influence of different modification parameters on the dechlorination effect was studied in a fixed bed experimental device,and analyses were conducted on the kinetics of HCl adsorption experimental results.Afrter which,the nonlinear fitting was carried out for the experimental data by five apparent kinetic models.Researches results show that,the order of fitting effect is Bangham model,quasi-second-order model,Elovich model,quasi-first-order model and particle internal diffusion model.The process of mass transfer and diffusion always has a significant influence on HCl adsorption,which is the key control step.In the initial stage of reaction,when the surface-active site is not occupied and the internal pore is not blocked,the external mass transfer process is the dominant control step.In the middle stage of reaction,because the original developed pore structure is blocked by the product layer,the diffusion resistance in the particles become the dominant factor in HCl adsorption process.Meanwhile,the chemical reaction in surface always plays a leading role in HCl adsorption process.

关 键 词：氯化氢 氧化钙 脱氯机理 动力学 扩散 

分 类 号：X511[环境科学与工程—环境工程]