基于变湿吸附的空气CO_2捕集与植物利用的耦合研究（英文）  

Integrated direct air capture and CO_2 utilization of gas fertilizer based on moisture swing adsorption

作　　者：Cheng-long HOU Yu-song WU You-zhou JIAO Jie HUANG Tao WANG Meng-xiang FANG Hui ZHOU 

机构地区：[1]State Key Laboratory of Clean Energy Utilization,Zhejiang University [2]Key Laboratory of New Materials and Facilities for Rural Renewable Energy of the Ministry of Agriculture,Henan Agricultural University [3]Department of Earth and Environmental Engineering,Columbia University

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2017年第10期819-830,共12页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：Project supported by the National Natural Science Foundation of China(No.51676169);the Fundamental Research Funds for the Central Universities,China

摘　　要：目的:探究季铵型聚合物CO_2解吸附过程温度和CO_2浓度等变量对解吸附热力学和动力学的影响;研究空气CO_2捕集供给植物增产的耦合方法,降低空气CO_2捕集与利用的能耗与成本。创新点:1.基于变湿吸附技术,探究了季铵型聚合物CO_2解吸附过程的热力学及动力学特性;2.获得了CO_2作为气肥供给植物增产的关键影响参数;3.建立并优化了空气CO_2捕集与植物利用的耦合模型。方法:1.通过CO_2吸附平衡与动力学实验,获得季铵型聚合物CO_2解吸附的平衡常数和动力学常数的影响参数;2.通过植物CO_2吸收实验,获得CO_2供给植物增产过程中CO_2浓度和光照强度对吸收速率的影响;3.通过理论推导,构建解吸附CO_2浓度与吸附剂质量、温度以及吹扫气流量等的关系,获得空气CO_2捕集与植物增产的耦合模型并计算CO_2捕集的能耗与成本。结论:1.季铵型聚合物材料吸附CO_2的平衡常数随温度的升高而降低;吸附、解吸附动力学常数随温度的升高而升高。2.CO_2供给植物增产的最佳浓度和光照强度为1000 ppm和8000 lux。3.基于优化的空气捕集与植物利用的耦合算法,CO_2的捕集能耗与成本分别为35.67 k J/mol和34.68 USD/t。A new concept of low-cost direct air capture technology integrated with a fertilization system is proposed, as an alternative to the application of air derived CO2. A moisture swing sorbent can elevate the CO2 concentration from 400 parts per million（ppm） to several thousand ppm, and this can be used to cultivate plants. Desorption isotherms were determined and are described well by a Langmuir model. The adsorption rate constant and the desorption rate constant were gained at 25℃, 35 ℃, and 45 ℃ under 1000 ppm concentration of CO2. In accelerated cultivation experiments, the effects of CO2 concentration, light intensity, and spectrum on the CO2 uptake rate of the plants were investigated. A multi-bed desorption system which is capable of providing a continuous and stable CO2 supply for a greenhouse is demonstrated based on the desorption characteristic and CO2 uptake feature of plants. An energy and cost assessment for the integrated system was performed and the results indicated that minimum energy requirements and cost estimate of CO2 are 35.67 k J/mol and 34.68 USD/t, respectively. This makes direct air capture a competitive and sustainable carbon source for agriculture.

关 键 词：直接空气捕集 解吸附动力学 温室 CO2气肥 成本分析 

分 类 号：X173[环境科学与工程—环境科学] X701