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Simulation and optimization of novel CO2 direct steam stripping process based on the experimental results
FANG Meng-xiang1, JIANG Wen-min1, WANG Tao1, XIANG Qun-yang1, LU Jia-hui2, ZHOU Xu-ping1
1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China; 2. EDF China R&D Center, Beijing 100005, China
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The technology of CO2 direct steam stripping is considered as a promising way to solve the high energy penalty problem in the chemical post combustion CO2 capture process, which based on the absorber of MEA. A packed column was set up to investigate the impacts of steam flow rate, steam superheated temperature, preheat temperature of the rich solvent, column pressure and the packing material via experimental and modeling approaches. The results show that the steam flow rate and the temperature of rich solvent impact significantly on the CO2 regeneration rate, while the influence of the steam temperature superheated temperature is relatively small. The influence of column pressure to the CO2 regeneration rate varies with the steam flow rate changing. And the CO2 regeneration rate increases with the column pressure increasing under different stream flow rate. The CY packing material shows the best CO2 regeneration performance among the five kinds of tested packing material. The novel process can reduce the regeneration energy to 3 MJ per kilogram CO2 or even lower in the optimization condition.

Published: 01 August 2015
CLC:  TQ 028.1  
  X 511  
Cite this article:

FANG Meng-xiang, JIANG Wen-min, WANG Tao, XIANG Qun-yang, LU Jia-hui, ZHOU Xu-ping. Simulation and optimization of novel CO2 direct steam stripping process based on the experimental results. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2015, 49(8): 1565-1571.

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针对以乙醇胺(MEA)吸收剂为代表的传统化学吸收工艺具有再生能耗高的缺点,探究将过热蒸气直接通入再生塔与吸收剂接触再生CO2的工艺流程.通过实验和模拟分析该工艺过程中吹扫蒸气流量、蒸气过热度、富液温度、再生塔压力、填料种类对于CO2再生效果的影响.结果显示,吹扫蒸气流量,富液温度对CO2再生效果影响较为明显,而吹扫蒸气过热度对CO2再生效果影响不大.再生塔压力对再生CO2量的影响在不同的吹扫蒸气流量下呈现不同的趋势.在5种填料种类中,CY填料对CO2再生效果最好.该工艺可以有效降低热再生能耗计算过程中气化潜热部分能耗,在优化的操作条件下可以将CO2再生能耗降至每千克CO2 3 MJ 以下.

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