Enhanced SO2 and CO2 synergistic capture with reduced NH3 emissions using multi-stage solvent circulation process

IF 13.3 1区 工程技术 Q1 ENGINEERING, CHEMICAL Chemical Engineering Journal Pub Date : 2024-10-30 DOI:10.1016/j.cej.2024.157276
Chengjin Pan, Lingyu Shao, Chang Liu, Zhengang Zhou, Zihan Zhou, Shihan Zhang, Qingyi Li, Liping Deng, Chenghang Zheng, Xiang Gao
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Abstract

NH3-based SO2 and CO2 synergistic capture technology shows promise in reducing the costs associated with current flue gas desulfurization and CO2 capture systems. However, it faces challenges such as NH3 slip and high energy consumption. In this study, we proposed an advanced Multi-Stage Solvent Circulation (MSC) process that incorporates a desulfurization-washing solution circulation, which involved partitioned absorption according to different functions of SO2 capture, CO2 capture, and NH3 emission control. The experimental results demonstrated that using desulfurization solution in place of water for washing reduced the NH3 emissions from the absorber and desorber by 10.6 % and 7.9 %, respectively. Additionally, the recovered NH3 enhanced SO2 capture, resulting in a 61.8 % decrease in SO2 emission concentration. A pilot-plant trial model for SO2 and CO2 synergistic capture was further developed using Aspen Plus. The impact of operational time and parameters on capture efficiency and energy consumption were analyzed. Under typical flue gas conditions, the process achieved SO2 capture efficiency of > 99 %, regeneration energy consumption of 2.42 GJ/t CO2, NH3 emissions of < 5 ppm. This study presents a novel approach for designing a SO2 and CO2 synergistic capture system, which has the potential to facilitate the economic and effective implementation of post-combustion flue gas pollutant control management and carbon emission reduction.

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利用多级溶剂循环工艺加强二氧化硫和二氧化碳的协同捕获,减少 NH3 的排放
基于 NH3 的二氧化硫和二氧化碳协同捕集技术有望降低当前烟气脱硫和二氧化碳捕集系统的相关成本。然而,它也面临着 NH3 滑移和高能耗等挑战。在这项研究中,我们提出了一种先进的多级溶剂循环(MSC)工艺,该工艺结合了脱硫-洗涤液循环,根据二氧化硫捕集、二氧化碳捕集和 NH3 排放控制的不同功能进行分区吸收。实验结果表明,用脱硫溶液代替水进行洗涤,吸收器和解吸塔的 NH3 排放量分别减少了 10.6% 和 7.9%。此外,回收的 NH3 还增强了二氧化硫捕集能力,使二氧化硫排放浓度降低了 61.8%。使用 Aspen Plus 进一步开发了二氧化硫和二氧化碳协同捕集的中试厂试验模型。分析了运行时间和参数对捕集效率和能耗的影响。在典型的烟气条件下,该工艺的二氧化硫捕集效率为 99%,再生能耗为 2.42 GJ/t CO2,NH3 排放为 5 ppm。这项研究提出了一种设计二氧化硫和二氧化碳协同捕集系统的新方法,有望促进经济、有效地实施燃烧后烟气污染物控制管理和碳减排。
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来源期刊
Chemical Engineering Journal
Chemical Engineering Journal 工程技术-工程:化工
CiteScore
21.70
自引率
9.30%
发文量
6781
审稿时长
2.4 months
期刊介绍: The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.
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