Carbon Capture Science & Technology最新文献_第8页

Available data and knowledge gaps of the CESAR1 solvent system CESAR1 溶剂系统的现有数据和知识差距

Carbon Capture Science & Technology

Pub Date : 2024-10-03 DOI: 10.1016/j.ccst.2024.100290

Diego Morlando , Vanja Buvik , Asmira Delic , Ardi Hartono , Hallvard F. Svendsen , Hanne M. Kvamsdal , Eirik F. da Silva , Hanna K. Knuutila

Amine-based chemical absorption stands out as the leading technology for post-combustion CO₂-capture. A blend of 3 M 2-amino-2-methyl-1-propanol (AMP) and 1.5 M piperazine (PZ), also known as CESAR1, has proven to outperform the current benchmark ethanolamine (MEA), exhibiting better energy performance and lower degradation rates. This review aims to gather all the experimental laboratory and pilot available data for CESAR1 and its constituent components. Experimental gaps to develop reliable process models are detected and future experiments are proposed. An overview of the knowledge related to amine and degradation compound emissions and environmental impacts of CESAR1, together with hands-on experience in operating the solvent, is presented in this review.

The main findings of the review are that sufficient physical properties, N₂O-solubility, and speciation data for the CESAR1 solvent are not available in the open literature, even though necessary for the development of reliable process models. A review of the degradation compounds for AMP, PZ and AMP/PZ blends outlines that the nitrogen balance for AMP and PZ is not closed, meaning that there still are compounds that need identification and quantification in the degraded solvent. Given the higher volatility of AMP compared to MEA, a better understanding of the formation and behaviour of aerosol and gas phase emissions is required. A review of pilot plant campaigns for AMP/PZ blends shows that CESAR1 performs better in terms of energy compared to MEA and degrades less. There is, however, the need for high-quality pilot campaigns where all data needed for process model validation is provided for the scientific community. Finally, amine emission mitigation strategies and data on the environmental impact and toxicity of AMP and PZ are presented and discussed.

胺类化学吸收技术是燃烧后捕集二氧化碳的领先技术。事实证明，3 M 2-氨基-2-甲基-1-丙醇（AMP）和 1.5 M 哌嗪（PZ）的混合物（也称为 CESAR1）优于目前的基准乙醇胺（MEA），表现出更好的能量性能和更低的降解率。本综述旨在收集有关 CESAR1 及其组成成分的所有实验室和试验数据。发现了在开发可靠工艺模型方面存在的实验差距，并提出了未来的实验建议。本综述概述了与胺和降解化合物排放以及 CESAR1 对环境的影响有关的知识，并介绍了操作该溶剂的实践经验。综述的主要发现是，尽管对于开发可靠的工艺模型十分必要，但公开文献中并没有关于 CESAR1 溶剂的充分的物理性质、N2O 溶解性和规格数据。对 AMP、PZ 和 AMP/PZ 混合物的降解化合物进行审查后发现，AMP 和 PZ 的氮平衡尚未结束，这意味着降解溶剂中仍有一些化合物需要识别和定量。鉴于 AMP 与 MEA 相比具有更高的挥发性，因此需要更好地了解气溶胶和气相排放物的形成和行为。对 AMP/PZ 混合物试点工厂活动的审查表明，与 MEA 相比，CESAR1 的能量表现更好，降解也更少。不过，需要开展高质量的试验活动，为科学界提供工艺模型验证所需的所有数据。最后，介绍并讨论了胺排放缓解策略以及 AMP 和 PZ 对环境的影响和毒性数据。

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引用次数: 0

Synergizing black gold and light: A comprehensive analysis of biochar-photocatalysis integration for green remediation 黑金与光的协同作用：生物炭-光催化一体化绿色修复综合分析

Carbon Capture Science & Technology

Pub Date : 2024-10-03 DOI: 10.1016/j.ccst.2024.100315

Iltaf Khan , Samreen Sadiq , Ping Wu , Muhammad Humayun , Sami Ullah , Waleed Yaseen , Sikandar Khan , Abbas Khan , Rasha A. Abumousa , Mohamed Bououdina

Biochar is a porous, high-surface-area, black carbon-rich product that offers a cost-effective and environmentally friendly option to replace conventional charcoal. However, its specific structure and limited biodegradability pose challenges for its widespread applications. Photocatalysis is suggested as an alternative approach to harness solar energy and transform it into solar fuels. Interestingly, nanomaterials-based photocatalysts with tailored energy band properties and non-toxic characteristics, high surface areas, enhanced stability, and tunable pore sizes, have gained attention for their potential in diverse applications. Therefore, existing research on biochar-based photocatalysis systems (BBPs) aims to address different environmental issues. Interestingly, BBPs offer benefits such as excellent electrical conductivity, versatile functional groups, large surface area, and multiple surface-active sites, promoting high charge mobility, electron reservoir, superior charge separation, and small bandgap. This review provides a comprehensive overview of BBPs developments, including synthesis methods and properties. The fusion of BBPs is used in CO₂ conversion, photocatalytic H₂ generation, CO₂ reduction, pollutants, dyes, and pharmaceutical degradation. Although the intermarriage of BBPs has potential benefits, their effectiveness may be compromised when modified photocatalysts are incorporated, which may negatively influence carrier generation efficiency and overall performance. Therefore, there is empty room for further research on their physical properties, effectiveness, long-term stability, and reusability of BBPs.

生物炭是一种多孔、高比表面积、富含黑碳的产品，为替代传统木炭提供了一种具有成本效益且环保的选择。然而，其特殊的结构和有限的生物降解性为其广泛应用带来了挑战。光催化被认为是利用太阳能并将其转化为太阳能燃料的替代方法。有趣的是，基于纳米材料的光催化剂具有量身定制的能带特性和无毒特性、高比表面积、更高的稳定性和可调孔径，因其在不同应用领域的潜力而备受关注。因此，现有的基于生物炭的光催化系统（BBPs）研究旨在解决不同的环境问题。有趣的是，BBPs 具有优异的导电性、多功能基团、大表面积和多表面活性位点等优点，可促进高电荷迁移率、电子贮存、优异的电荷分离和小带隙。本综述全面概述了 BBPs 的发展，包括合成方法和特性。BBPs 的融合可用于二氧化碳转化、光催化 H2 生成、二氧化碳还原、污染物、染料和药物降解。虽然 BBPs 的相互融合具有潜在的益处，但当加入改性光催化剂时，其有效性可能会受到影响，这可能会对载流子的生成效率和整体性能产生负面影响。因此，BBPs 的物理性质、有效性、长期稳定性和可重复使用性仍有进一步研究的空间。

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引用次数: 0

CO2 absorption performance of biogas slurry enhanced by biochar as a potential solvent in once-through CO2 chemical absorption process 生物炭作为一次性二氧化碳化学吸收过程中的潜在溶剂，提高了沼气浆的二氧化碳吸收性能

Carbon Capture Science & Technology

Pub Date : 2024-10-03 DOI: 10.1016/j.ccst.2024.100317

Yizhong Duan , Yang Liu , Haonan Liu , Zhan Shi , Xinran Shen , Xiantong Sun , Shixin Zhao , Shuiping Yan , Feihong Liang

Carbon capture, utilization, and storage (CCUS), offers a promising avenue for mitigating CO₂ emissions, in which the big challenge is the high CO₂ capture cost. A novel CCUS technology called once-through CO₂ chemical absorption using biogas slurry, could potentially reduce the CO₂ capture cost through decreasing the energy consumption greatly during CO₂ capture. This technology, however, is constrained by the CO₂ absorption capacity of biogas slurry. To enhance the CO₂ capture capacity of this innovative technology, we proposed a method to enhance CO₂ absorption by integrating biochar into biogas slurry. Results indicated that the CO₂ absorption capacity of biogas slurry improved by biochar varied with the type of biochar adopted. Among all the investigated biochar, the wood biochar like sea buckthorn and sand willow exhibited the lowest CO₂ capture enhancement, with 0.82±0.19 mmol/g and 0.81±0.30 mmol/g, respectively. Biochar from C4 plants like corn stalks and cobs demonstrated the highest enhancement, with 2.11±0.24 mmol/g and 2.47±0.86 mmol/g, respectively. The enhancement driven by C3 plant biochar like millet stalks and shells was intermediate, with 1.62±0.47 mmol/g and 1.62±0.46 mmol/g, respectively. The primary factor for promoting CO₂ absorption in the biochar-based biogas slurry was the increase in pH of biogas slurry. The total pore volume of biochar was the principal material property that enhanced CO₂ absorption, followed by the EC and BET surface areas of biochar. Increasing the carbonization temperature of biochar could also enhance the CO₂ absorption capacity by biogas slurry. In CO₂-rich biochar-based biogas slurry, CO₂ primarily existed as HCO₃⁻ and carbamate. However, for the influence of the biochar's pore structure, CO₂ in the CO₂-rich biochar-based biogas slurry was more stable than that in CO₂-rich biogas slurry.

碳捕集、利用和封存（CCUS）为减少二氧化碳排放提供了一个前景广阔的途径，但其中最大的挑战是高昂的二氧化碳捕集成本。一种新型的 CCUS 技术，即利用沼气浆对二氧化碳进行一次性化学吸收，可以大大降低二氧化碳捕集过程中的能耗，从而有可能降低二氧化碳捕集成本。然而，这项技术受到沼气浆二氧化碳吸收能力的限制。为了提高这项创新技术的二氧化碳捕集能力，我们提出了一种通过在沼气浆中加入生物炭来提高二氧化碳吸收能力的方法。结果表明，生物炭提高的沼气浆对二氧化碳的吸收能力因所采用的生物炭类型而异。在所有研究的生物炭中，沙棘和沙柳等木质生物炭的二氧化碳捕集能力最低，分别为 0.82±0.19 mmol/g 和 0.81±0.30 mmol/g。来自 C4 植物（如玉米秆和玉米棒）的生物炭的二氧化碳捕集增强率最高，分别为 2.11±0.24 mmol/g 和 2.47±0.86 mmol/g。小米茎秆和外壳等 C3 植物生物炭的增强效果居中，分别为 1.62±0.47 mmol/g 和 1.62±0.46 mmol/g。促进生物炭基沼气浆吸收二氧化碳的主要因素是提高沼气浆的 pH 值。生物炭的总孔容积是促进二氧化碳吸收的主要材料特性，其次是生物炭的导电率和 BET 表面积。提高生物炭的碳化温度也能增强沼气浆对 CO2 的吸收能力。在富含 CO2 的生物炭沼气浆中，CO2 主要以 HCO3- 和氨基甲酸酯的形式存在。然而，受生物炭孔隙结构的影响，富含 CO2 的生物炭基沼气浆中的 CO2 比富含 CO2 的沼气浆中的 CO2 更稳定。

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引用次数: 0

CO2 electrochemical reduction to formic acid: An overview of process sustainability 二氧化碳电化学还原为甲酸：工艺可持续性概述

Carbon Capture Science & Technology

Pub Date : 2024-09-30 DOI: 10.1016/j.ccst.2024.100308

Zeyad M. Ghazi , Dina Ewis , Hazim Qiblawey , Muftah H. El-Naas

CO₂ Electrochemical Reduction (CO₂ ECR) is a promising technology that converts CO₂ into value-added products, including formic acid, ethanol, and methanol, by applying external voltage. This technology is not only considered a CO₂ mitigation process but a process that produces value-added chemicals reducing dependence on fossil fuels. This review assesses the sustainability of the CO₂ ECR process by focusing on life cycle assessment and techno-economic evaluation studies. Recent advances in catalysts and cell structures for CO₂ ECR are also discussed from a sustainability perspective. Furthermore, the integration of CO₂ ECR with renewable resources as a power source is highlighted. The review aims to determine the sustainability of CO₂ conversion for formic acid production and to provide guidelines for future advancements. Research gaps and challenges are also provided.

二氧化碳电化学还原（CO2 ECR）是一项前景广阔的技术，它通过外加电压将二氧化碳转化为甲酸、乙醇和甲醇等增值产品。该技术不仅被认为是一种二氧化碳减排工艺，还是一种生产高附加值化学品的工艺，可减少对化石燃料的依赖。本综述通过重点关注生命周期评估和技术经济评估研究，对二氧化碳 ECR 工艺的可持续性进行评估。还从可持续发展的角度讨论了二氧化碳 ECR 催化剂和电池结构的最新进展。此外，还重点介绍了二氧化碳 ECR 与可再生资源作为动力源的结合。该综述旨在确定二氧化碳转化生产甲酸的可持续性，并为未来的进展提供指导。此外，还提供了研究差距和挑战。

引用次数: 0

Biobased ionic liquid solutions for an efficient post-combustion CO2 capture system 用于高效燃烧后二氧化碳捕获系统的生物基离子液体解决方案

Carbon Capture Science & Technology

Pub Date : 2024-09-28 DOI: 10.1016/j.ccst.2024.100312

Salvatore F. Cannone , Michel Tawil , Sergio Bocchini , Massimo Santarelli

This study explores the use of ionic liquids (ILs) as a novel and efficient alternative to conventional monoethanolamine (MEA) for CO₂ capture. While MEA scrubbing is well-known for carbon sequestration, it faces limitations such as high energy consumption, toxicity, and rapid degradation. In contrast, ILs offer advantages such as non-volatility, stability, and reduced corrosiveness. We focus on a biodegradable IL comprising choline ([Cho]) and proline ([Pro]) amino acids to create an eco-friendly solution. Dimethyl sulfoxide (DMSO) is introduced as a diluent to mitigate viscosity issues during CO₂ uptake. Our research measures the thermo-physical properties, including density and viscosity of [Cho][Pro] in DMSO at different concentrations. The addition of DMSO resulted in a viscosity reduction of >97 % at a temperature of 303 K for the three virgin solutions compared to the pure IL. In addition, the CO₂ capture performance was evaluated using a system of absorption and desorption reactors. The results show that the 25 % wt [Cho][Pro] solution excels, achieving over 90 % CO₂ absorption, 0.66

m o l_{C O_{2}} / m o l_{I L}

in the first cycle, and demonstrating high reusability and regeneration efficiency over multiple cycles. Comparisons indicate that the IL solution outperforms traditional aqueous MEA solutions. Longer term testing confirms the solution's stability and minimal degradation, achieving a regeneration efficiency of >55 % over 30 cycles, suggesting the potential of [Cho][Pro] for sustainable long-term CO₂ capture applications.

本研究探讨了使用离子液体（IL）作为传统单乙醇胺（MEA）的新型高效替代品来捕获二氧化碳。众所周知，MEA 是一种用于碳封存的洗涤剂，但它面临着能耗高、毒性大和降解快等局限性。相比之下，IL 具有不挥发性、稳定性和腐蚀性低等优点。我们重点研究了一种由胆碱（[Cho]）和脯氨酸（[Pro]）氨基酸组成的可生物降解的 IL，以创造一种生态友好型解决方案。我们还引入了二甲基亚砜（DMSO）作为稀释剂，以缓解二氧化碳吸收过程中的粘度问题。我们的研究测量了不同浓度二甲基亚砜中[Cho][Pro]的热物理性质，包括密度和粘度。与纯 IL 相比，添加 DMSO 后，三种原始溶液在 303 K 温度下的粘度降低了 97%。此外，还使用吸收和解吸反应器系统对二氧化碳捕获性能进行了评估。结果表明，25% wt [Cho][Pro]溶液表现出色，二氧化碳吸收率超过 90%，在第一个循环中达到 0.66 molCO2/molIL，并在多个循环中表现出较高的重复利用率和再生效率。比较表明，IL 溶液优于传统的 MEA 水溶液。更长期的测试证实了溶液的稳定性和最小降解，在 30 个循环中实现了 55% 的再生效率，这表明 [Cho][Pro] 具有长期可持续二氧化碳捕获应用的潜力。

{"title":"Biobased ionic liquid solutions for an efficient post-combustion CO2 capture system","authors":"Salvatore F. Cannone , Michel Tawil , Sergio Bocchini , Massimo Santarelli","doi":"10.1016/j.ccst.2024.100312","DOIUrl":"10.1016/j.ccst.2024.100312","url":null,"abstract":"<div><div>This study explores the use of ionic liquids (ILs) as a novel and efficient alternative to conventional monoethanolamine (MEA) for CO<sub>2</sub> capture. While MEA scrubbing is well-known for carbon sequestration, it faces limitations such as high energy consumption, toxicity, and rapid degradation. In contrast, ILs offer advantages such as non-volatility, stability, and reduced corrosiveness. We focus on a biodegradable IL comprising choline ([Cho]) and proline ([Pro]) amino acids to create an eco-friendly solution. Dimethyl sulfoxide (DMSO) is introduced as a diluent to mitigate viscosity issues during CO<sub>2</sub> uptake. Our research measures the thermo-physical properties, including density and viscosity of [Cho][Pro] in DMSO at different concentrations. The addition of DMSO resulted in a viscosity reduction of >97 % at a temperature of 303 K for the three virgin solutions compared to the pure IL. In addition, the CO<sub>2</sub> capture performance was evaluated using a system of absorption and desorption reactors. The results show that the 25 % wt [Cho][Pro] solution excels, achieving over 90 % CO<sub>2</sub> absorption, 0.66 <span><math><mrow><mi>m</mi><mi>o</mi><msub><mi>l</mi><mrow><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub></mrow></msub><mo>/</mo><mi>m</mi><mi>o</mi><msub><mi>l</mi><mrow><mi>I</mi><mi>L</mi></mrow></msub></mrow></math></span> in the first cycle, and demonstrating high reusability and regeneration efficiency over multiple cycles. Comparisons indicate that the IL solution outperforms traditional aqueous MEA solutions. Longer term testing confirms the solution's stability and minimal degradation, achieving a regeneration efficiency of >55 % over 30 cycles, suggesting the potential of [Cho][Pro] for sustainable long-term CO<sub>2</sub> capture applications.</div></div>","PeriodicalId":9387,"journal":{"name":"Carbon Capture Science & Technology","volume":"13 ","pages":"Article 100312"},"PeriodicalIF":0.0,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142358076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

System design of a novel open-air brayton cycle integrating direct air capture 集成直接空气捕获的新型露天布雷顿循环系统设计

Carbon Capture Science & Technology

Pub Date : 2024-09-26 DOI: 10.1016/j.ccst.2024.100311

Seongmin Son

The Direct Air Capture (DAC) technology is essential for achieving carbon neutrality, as it enables processes with net-negative CO₂ emissions. However, its widespread commercialization faces significant challenges due to high energy requirements. Numerous attempts have been made to address this issue through thermal integration, yet the fundamental challenge of the high cost associated with extracting large volumes of low-concentration CO₂ from ambient air remains unresolved. In this study, the integration of Open-Air Brayton Cycle (OABC) as a solution to enhance overall system utilization by simultaneously utilizing large volumes of ambient air is introduced. Various OABC coupled temperature swing adsorption based DAC system layouts are analyzed while considering different regeneration temperatures, and the results revealed the optimal configurations that significantly reduce energy cost per captured unit of CO₂ with high purity and recovery. By combining an equilibrium short-cut model for temperature swing adsorption with process simulation methodologies, this research proposes the concept of “energy cost”—a metric that represents the amount of CO₂ captured against the energy penalty incurred by integrating DAC with OABC systems. The findings demonstrate that combining DAC and OABC systems could yield high purity and recovery rates of CO₂ through strategic thermal management and advanced adsorbent usage, offering a synergistic approach to carbon capture from an energy consumption perspective.

直接空气捕集（DAC）技术对于实现碳中和至关重要，因为它可以实现二氧化碳净负值排放的工艺。然而，由于能源需求高，该技术的广泛商业化面临着巨大挑战。通过热集成解决这一问题的尝试不胜枚举，但从环境空气中提取大量低浓度二氧化碳的高成本这一根本挑战仍未得到解决。在本研究中，介绍了将开式空气布雷顿循环（OABC）作为一种解决方案，通过同时利用大量环境空气来提高整个系统的利用率。在考虑不同再生温度的同时，对各种基于变温吸附的开式布赖顿循环耦合 DAC 系统布局进行了分析，结果表明，最佳配置可显著降低每捕获单位二氧化碳的能源成本，同时具有高纯度和高回收率。通过将变温吸附的平衡捷径模型与工艺模拟方法相结合，本研究提出了 "能源成本 "的概念--一种表示二氧化碳捕集量与 DAC 和 OABC 系统集成所产生的能源损失的指标。研究结果表明，通过战略性的热管理和先进的吸附剂使用方法，将 DAC 和 OABC 系统结合在一起可产生高纯度和高回收率的二氧化碳，从能源消耗的角度来看，这为碳捕集提供了一种协同方法。

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引用次数: 0

Hydrothermal-calcination synthesis of lithium orthosilicate microspheres for high-temperature CO2 capture 水热煅烧合成用于高温捕获二氧化碳的正硅酸锂微球

Carbon Capture Science & Technology

Pub Date : 2024-09-26 DOI: 10.1016/j.ccst.2024.100303

Xicheng Wang , Wentao Xia , Xianda Sun , Yuandong Yang , Xiaohan Ren , Yingjie Li

In recent years, the Li₄SiO₄ adsorbent has become a promising candidate for high-temperature CO₂ capture. The fabrication of micro-structured Li₄SiO₄ could enhance the capture performance effectively. However, there exists a conflict between the purity and the morphology of prepared micro-structured Li₄SiO₄. This study proposed a novel hydrothermal-calcination method, which could produce Li₄SiO₄ microspheres with great morphology and relatively high purity. The physicochemical properties, CO₂ capture performance and forming mechanisms of Li₄SiO₄ microspheres are evaluated and investigated systematically. It is found that the hydrothermal process could fabricate micro-spherical LiOH@Li₂SiO₃ precursor, which was further converted to Li₄SiO₄ microspheres during the subsequent calcination process. The LiOH@Li₂SiO₃ precursor could not only maintain the microstructure but also reduce the Li₄SiO₄ generation temperature, thus improving the morphology as well as the purity of obtained Li₄SiO₄ microspheres. As a result, the adsorbents could reach a CO₂ capture capacity of 0.167–0.222 g/g within 30 min's adsorption under 15 vol.% CO₂, and their cyclic stability are diverse depending on the used calcination temperatures. The hydrothermal-calcination contributes to the future preparation of high-performance Li₄SiO₄-based CO₂ adsorbents.

近年来，Li4SiO4 吸附剂已成为高温捕集二氧化碳的理想候选材料。制备微结构的 Li4SiO4 可以有效提高捕集性能。然而，制备的微结构 Li4SiO4 在纯度和形貌之间存在矛盾。本研究提出了一种新型的水热煅烧方法，该方法可以制备出具有良好形貌和较高纯度的 Li4SiO4 微球。该研究对 Li4SiO4 微球的理化性质、二氧化碳捕集性能和形成机理进行了系统评价和研究。研究发现，水热法可以制备微球形的 LiOH@Li2SiO3 前驱体，并在随后的煅烧过程中进一步转化为 Li4SiO4 微球。LiOH@Li2SiO3 前驱体不仅能保持微观结构，还能降低 Li4SiO4 的生成温度，从而改善获得的 Li4SiO4 微球的形态和纯度。因此，在 15 vol.% CO2 的条件下，吸附剂在 30 分钟的吸附过程中就能达到 0.167-0.222 g/g 的二氧化碳捕集量，并且其循环稳定性因所使用的煅烧温度而异。水热煅烧有助于未来制备高性能的基于 Li4SiO4 的二氧化碳吸附剂。

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引用次数: 0

Eliminating insoluble products and enhancing reversible CO2 capture of a tetraethylenepentamine-based non-aqueous absorbent: Exploring the synergistic regulation of 2-amino-2-methyl-1-propanol and n-propanol 消除四乙烯五胺基非水吸收剂的不溶产物并提高其可逆二氧化碳捕获能力探索 2-氨基-2-甲基-1-丙醇和正丙醇的协同调节作用

Carbon Capture Science & Technology

Pub Date : 2024-09-26 DOI: 10.1016/j.ccst.2024.100310

Xiaobin Zhou , Yunqiong Tang , Chao Liu , Shengpeng Mo , Yinming Fan , Dunqiu Wang , Bihong Lv , Yanan Zhang , Yinian Zhu , Zongqiang Zhu , Guohua Jing

To tackle the prevalent challenges encountered with polyamine-based non-aqueous absorbents (NAAs), particularly the formation of viscous products and inferior regeneration performance, this study proposed an innovative synergistic regulation strategy that integrated 2-amino-2-methyl-1-propanol (AMP) and n-propanol (NPA). Accordingly, a novel tertiary tetraethylenepentamine (TEPA)-AMP-NPA (T-A-N) NAA was devised. The optimized T-A-N maintained complete homogeneity throughout the entire CO₂ absorption process and achieved an impressive CO₂ loading of 1.15 mol·mol⁻¹ while maintaining a low viscosity of merely 22.47 mPa·s. Remarkably, its absorption capacity showed little decrement after four consecutive absorption-desorption cycles, underscoring its exceptional recyclability. Within the T-A-N system, AMP underwent a reaction with CO₂, yielding AMP-carbamate and protonated AMP, while TEPA engaged in CO₂ absorption to form zwitterionic carbamates. During the desorption process, NPA served as a regeneration activator, facilitating the conversion of stable TEPA-carbamates into less stable alkyl carbonate intermediates, thereby enhancing the T-A-N's regeneration performance. Moreover, the T-A-N system addressed the issue of TEPA-carbamate self-aggregation into insoluble gelatinous substances by leveraging the synergistic enhancement effects between AMP derivatives and NPA. Specifically, these components effectively bound TEPA-carbamate species via robust electrostatic affinity and intermolecular hydrogen-bond interactions, inhibiting their self-aggregation and preventing the formation of insoluble products. Furthermore, T-A-N exhibited a significant reduction in both sensible and latent heat requirements, by 67 % and 82 % respectively, compared to 30 wt% MEA, highlighting its advantageous energy-saving potential for CO₂ capture. Overall, harnessing the synergistic enhancement effects of AMP and NPA was conducive to the development of polyamine-based NAAs that offered superior CO₂ capture reversibility, low energy consumption, and resistance to insoluble product formation.

针对多胺基非水基吸附剂（NAA）普遍存在的难题，特别是形成粘性产品和再生性能较差的问题，本研究提出了一种创新的协同调节策略，将 2-氨基-2-甲基-1-丙醇（AMP）和正丙醇（NPA）结合在一起。因此，研究人员设计了一种新型的叔四乙烯五胺（TEPA）-AMP-NPA（T-A-N）NAA。优化后的 T-A-N 在整个二氧化碳吸收过程中保持了完全的均一性，二氧化碳负载量达到了惊人的 1.15 mol-mol-1，同时保持了仅 22.47 mPa-s 的低粘度。值得注意的是，在连续四次吸收-解吸循环后，其吸收能力几乎没有下降，这凸显了其卓越的可回收性。在 T-A-N 系统中，AMP 与 CO2 发生反应，生成 AMP 氨基甲酸酯和质子化 AMP，而 TEPA 则吸收 CO2 生成齐聚物氨基甲酸酯。在解吸过程中，NPA 可作为再生活化剂，促进稳定的 TEPA 氨基甲酸酯转化为不太稳定的碳酸烷基酯中间体，从而提高 T-A-N 的再生性能。此外，T-A-N 系统还利用 AMP 衍生物和 NPA 的协同增效作用，解决了 TEPA-氨基甲酸酯自聚集成不溶性胶状物质的问题。具体来说，这些成分通过强大的静电亲和力和分子间氢键相互作用有效地结合了 TEPA-氨基甲酸酯物种，抑制了它们的自聚集，防止了不溶产物的形成。此外，与 30 wt% 的 MEA 相比，T-A-N 能显著降低显热和潜热需求，分别降低 67% 和 82%，突出了其在二氧化碳捕集方面的节能潜力。总之，利用 AMP 和 NPA 的协同增效作用，有助于开发多胺基 NAAs，这种 NAAs 具有优异的二氧化碳捕集可逆性、低能耗和抗不溶性产物形成的能力。

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引用次数: 0

Carbon capture and sequestration with in-situ CO2 and steam integrated 3D concrete printing 利用原位二氧化碳和蒸汽集成 3D 混凝土打印技术进行碳捕集与封存

Carbon Capture Science & Technology

Pub Date : 2024-09-26 DOI: 10.1016/j.ccst.2024.100306

Sean Gip Lim , Yi Wei Daniel Tay , Suvash Chandra Paul , Junghyun Lee , Issam T. Amr , Bandar A. Fadhel , Aqil Jamal , Ahmad O. Al-Khowaiter , Ming Jen Tan

Profound reliance of the building and construction sector on cement exacerbates its immense carbon footprint, accounting for a substantial portion of worldwide emissions. In this paper, we investigate the possibilities of in-situ carbon capture and sequestration to eliminate spatial constraints from a chamber confined curing solution via CO₂ and steam integrated 3D concrete printing. The presented technology involves a two-step extrusion-based system that sequesters captured CO₂ directly into concrete prior deposition at the nozzle printhead, so as to achieve artificially accelerated carbonation reactions with enhancement of mechanical properties. Accordingly, samples subjected to in-situ CO₂ and steam integration showed increases of up to 50.0 % 3D printability, 36.8 % compressive strength, and 45.3 % flexural strength compared to control at its respective curing conditions. The results of said approach demonstrated 38.2 % increase in bulk carbon uptake compared to accelerated carbonation confined curing methods, offering an alternative pathway towards decarbonized construction with 3DCP.

建筑行业对水泥的严重依赖加剧了其巨大的碳足迹，占全球排放量的很大一部分。在本文中，我们研究了原位碳捕集与封存的可能性，以通过二氧化碳和蒸汽一体化三维混凝土打印技术消除密室养护解决方案的空间限制。所介绍的技术包括一个基于挤压的两步系统，在喷嘴打印头沉积之前将捕获的二氧化碳直接封存到混凝土中，从而实现人工加速碳化反应并提高力学性能。因此，在各自的养护条件下，与对照组相比，经过原位二氧化碳和蒸汽整合的样品的三维打印性能提高了 50.0%，抗压强度提高了 36.8%，抗折强度提高了 45.3%。与加速碳化密闭固化方法相比，上述方法的结果表明体积碳吸收率提高了 38.2%，为利用 3DCP 实现建筑脱碳提供了另一条途径。

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引用次数: 0

A self-consistent design method of the autothermal dual circulating fluidized bed reactor for in-situ gasification chemical looping combustion of coal 用于煤炭就地气化化学循环燃烧的自热双循环流化床反应器的自洽设计方法

Carbon Capture Science & Technology

Pub Date : 2024-09-26 DOI: 10.1016/j.ccst.2024.100292

Xi Chen, Haibo Zhao

This paper establishes a design method for the autothermal dual circulating fluidized bed reactor (DCFBR) of the coal-fueled in-situ gasification chemical looping combustion (iG-CLC) process. This method, grounded in a self-consistent phenomenological model, comprehensively elucidates the factors of mass and energy conservation, fuel and oxygen carrier (OC) reaction processes, and fluidization characteristics within the reactor. It is particularly suitable for the rapid screening of numerous potential designs, obtaining detailed design parameters, and studying their interrelationships. Utilizing this method, the regulation patterns of dual-bed interactive transport-reaction phenomena within a 5 MW_th iG-CLC DCFBR are studied. Firstly, the effects of key design parameters on the OC circulation rate and bed inventory are analyzed. Following this, the impacts of circulation rate on the interactive heat and mass transfer between two beds are examined, delineating a reasonable range for the control of autothermal CLC process (circulation rate of 50–90 kg/m²s, temperature difference of 30–90 °C, OC conversion of 0.2–0.35, and oxygen-fuel ratio of 3–6). Subsequently, this paper investigates the influences of main design parameters on the performance metrics, such as gas/solid fuel conversion, operational costs, and operational benefits. It is found that the carbon stripper significantly enhances the carbon capture efficiency of the device, provided that its separation efficiency is maintained above 70–95 %. Sensitivity analysis is employed to study the response patterns of performance metrics to changes in input parameters. Ultimately, based on these analyses, a design scheme for the 5 MW_th reactor is determined, with a detailed examination of the pressure balance state of the reactor under the design conditions, and the balanced material and energy flows at the reactor inlets and outlets.

本文建立了以煤为燃料的原地气化化学循环燃烧（iG-CLC）工艺的自热双循环流化床反应器（DCFBR）的设计方法。该方法以自洽现象学模型为基础，全面阐明了反应器内的质量和能量守恒、燃料和氧载体（OC）反应过程以及流化特性等因素。它特别适用于快速筛选众多潜在的设计方案，获得详细的设计参数，并研究它们之间的相互关系。利用这种方法，研究了 5 MWth iG-CLC DCFBR 中双床互动迁移反应现象的调节模式。首先，分析了主要设计参数对 OC 循环速率和床层存量的影响。随后，研究了循环速率对两床间交互传热和传质的影响，为自热 CLC 过程的控制划定了一个合理的范围（循环速率为 50-90 kg/m2s，温差为 30-90 °C，OC 转化率为 0.2-0.35 和氧燃料比为 3-6）。随后，本文研究了主要设计参数对气体/固体燃料转换、运行成本和运行效益等性能指标的影响。研究发现，只要碳剥离器的分离效率保持在 70%-95% 以上，它就能显著提高设备的碳捕获效率。敏感性分析用于研究性能指标对输入参数变化的响应模式。最后，在这些分析的基础上，确定了 5 MWth 反应器的设计方案，并详细研究了设计条件下反应器的压力平衡状态，以及反应器入口和出口的平衡物质流和能量流。

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引用次数: 0