一种改进的LDF模型及其在活性炭吸附中的应用

doi:10.3969/j.issn.0438-1157.2014.10.028

化工学报 ›› 2014, Vol. 65 ›› Issue (10): 3953-3959.DOI: 10.3969/j.issn.0438-1157.2014.10.028

一种改进的LDF模型及其在活性炭吸附中的应用

王海鸿¹, 刘应书^1,2, 李子宜¹, 杨雄^1,2

1 北京科技大学机械工程学院, 北京 100083;
2 北京科技大学北京高校节能与环保工程研究中心, 北京 100083

收稿日期:2013-12-30 修回日期:2014-07-02 出版日期:2014-10-05 发布日期:2014-10-05
通讯作者: 杨雄
基金资助:
中央高校基本科研业务费专项资金项目（FRF-SD-12-013A）。

A new modified linear driving force model applied to activated carbon adsorption

WANG Haihong¹, LIU Yingshu^1,2, LI Ziyi¹, YANG Xiong^1,2

1 School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2 Beijing Engineering Research Center for Energy Saving and Environmental Protection, University of Science and Technology Beijing, Beijing 100083, China

Received:2013-12-30 Revised:2014-07-02 Online:2014-10-05 Published:2014-10-05
Supported by:
supported by the Fundamental Research Funds for the Central Universities (FRF-SD-12-013A).

摘要/Abstract

摘要： 以固相表面扩散模型为基础，研究了活性炭在不同吸附质浓度下单颗粒的吸附速率与吸附量之间的关系，以及颗粒内浓度分布随时间的变化过程。结合文献对LDF模型的假设，认为吸附初期对吸附剂颗粒内浓度分布做抛物线假设误差较大，吸附初期颗粒表面浓度分布梯度偏低，使得吸附速率降低，并提出了改进后的LDF模型，最后结合固相表面扩散模型和活性炭颗粒吸附SO₂固定床穿透实验曲线进行了验证。结果表明，采用改进后的LDF模型作为推动力方程的穿透曲线模型能够更加准确地描述实验过程。本文的研究结果能够为活性炭吸附过程提供理论依据和模型参考。

关键词: 活性炭, 吸附, 粒内扩散, LDF模型, 脱硫

Abstract: The relationship between adsorption rate and adsorbate quantity of a single particle, and the adsorbate concentration distribution changing with time inside the particle were studied based on the solid surface diffusion model. Referring to the assumption of LDF in literature, it was found that assuming a parabola distribution of adsorbate concentration inside the particle at the initial time was not suitable, because it caused a lower gradient of particle concentration distribution on the particle surface, and also a lower adsorption rate. A new improved LDF model was put forward, and was verified through the experimental curves of SO₂ adsorption on activated carbon. The modified LDF model was more accurate in predictng the breakthrough curves compared with the LDF model.

Key words: activated carbon, adsorption, intraparticle diffusion, LDF model, desulfurization

中图分类号:

TQ028.1

王海鸿, 刘应书, 李子宜, 杨雄. 一种改进的LDF模型及其在活性炭吸附中的应用[J]. 化工学报, 2014, 65(10): 3953-3959.

WANG Haihong, LIU Yingshu, LI Ziyi, YANG Xiong. A new modified linear driving force model applied to activated carbon adsorption[J]. CIESC Journal, 2014, 65(10): 3953-3959.

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一种改进的LDF模型及其在活性炭吸附中的应用

A new modified linear driving force model applied to activated carbon adsorption

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