UNS: Collaborative Research: Multiple-Scale Investigation of Chemical Looping with Oxygen Carrier Uncoupling

UNS：合作研究：载氧体解偶联化学循环的多尺度研究

• 批准号: 1510900
• 负责人: Fanxing Li
• 金额: $ 30.92万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-05-01 至 2020-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1510900&HistoricalAwards=false
• 关键词: UNS; Collaborative; Research; Multiple; Scale

Collaborative Proposals#1511818 / P.I.: Tian, Hanjiang#1510900 / P.I.: Li, FanxingThis research is expected to provide fundamental knowledge and scientific foundation for addressing CO2 capture and sequestration (CCS) from coal combustion, one of the most crucial areas of environmental sustainability. Among various CCS technologies, CLOU, a CLC scheme optimized for solid-fuel combustion (e.g., coal), represents one of the most promising options. Enabled by metal-oxide-based oxygen carriers capable of oxygen release and uptake under varying oxygen partial pressures, CLOU indirectly converts coal into separate streams of sequestration-ready CO2- and N2-rich flue gas via cyclic reactions. Consequently, the energy penalty associated with CO2 separation is inherently avoided. Compared to oxy-fuel combustion, the energy-intensive cryogenic oxygen separation is replaced by facile oxygen transfer enabled by the oxygen carrier, leading to significant improvement of carbon-capture efficiency. To date, most research in this area follows a trial-and-error approach due to lack of scientific understanding on the mechanism of coal-oxygen carrier interaction. Such an inefficient approach not only introduces potential uncertainties in technology and economics, but it also limits the progress of the development and implementation of CLC. The research is driven by the urgent needs for developing new scientific understanding and innovative tools and methodologies to investigate coal-oxygen carrier interaction and kinetics, oxygen-carrier optimization, and reactor and process simulations. The research will establish a solid theoretical groundwork for CLOU development from atomic level to reactor and process scales. These fundamental studies also are expected to lead to exciting discovery of novel catalytic-system and reactor configurations benefiting other research areas such as novel schemes for oxygen production, biomass combustion, coal/biomass gasification, and SOx/NOx emission control. Chemical Looping Combustion with Oxygen Carrier Uncoupling, a.k.a. CLOU, represents a unique combustion scheme that is directly related yet notably different from conventional combustion processes. It allows efficient fossil fuel combustion with minimal energy penalty for CO2 separation. Initiated by six leading U.S./Chinese research groups in the areas of both conventional and Chemical Looping Combustion (CLC), this multidisciplinary team brings together top chemical engineers, thermal engineers, mechanical engineers, and catalysis scientists to answer critical, interrelated scientific questions in combustion kinetics, surface reactions, oxygen-carrier development, thermal engineering, and reactor/process modeling, spanning from atomic level to reactor and process scales. Fundamental findings obtained from the proposed research are expected to significantly accelerate the development and deployment of CLOU for efficient coal combustion with integrated CO2 capture. The fundamental research focuses on four aspects: 1) lattice oxygen diffusion, surface reaction, and gas-phase combustion kinetics in a metal-oxide-assisted char/volatile oxidation scheme; 2) oxygen-carrier interactions with coal ash and impurities; 3) oxygen-carrier stability and performance evaluation in circulating fluidized bed CLC reactors, and 4) reactor and process modeling.These collaborative grants are co-funded by the Global Venture Fund (GVF) of NSF's International Science and Engineering section (ISE) and the CBET/ENG Combustion and Fire and Environmental Sustainability programs.

合作提案#1511818 / 负责人：田韩江#1510900 / 负责人：李繁星这项研究预计将为解决燃煤中二氧化碳捕获和封存（CCS）问题提供基础知识和科学基础，这是环境可持续发展最关键的领域之一。在各种 CCS 技术中，CLOU（一种针对固体燃料燃烧（例如煤）优化的 CLC 方案）代表了最有前途的选择之一。 CLOU 借助能够在不同氧分压下释放和吸收氧气的金属氧化物载氧体，通过循环反应将煤间接转化为可封存的富含二氧化碳和氮气的单独烟气流。因此，本质上避免了与二氧化碳分离相关的能量损失。与全氧燃烧相比，能量密集型的低温氧分离被氧载体实现的轻松氧转移所取代，从而显着提高了碳捕获效率。迄今为止，由于缺乏对煤-氧载体相互作用机制的科学理解，该领域的大多数研究都采用试错法。这种低效的方法不仅带来了技术和经济上潜在的不确定性，而且限制了CLC的开发和实施进度。该研究的驱动力是迫切需要开发新的科学认识和创新工具和方法，以研究煤-氧载体相互作用和动力学、氧载体优化以及反应器和过程模拟。该研究将为 CLOU 从原子级到反应器和过程尺度的发展奠定坚实的理论基础。这些基础研究预计还将带来新型催化系统和反应器配置的令人兴奋的发现，有益于其他研究领域，例如制氧、生物质燃烧、煤/生物质气化和 SOx/NOx 排放控制的新方案。载氧体解偶联的化学循环燃烧（又名 CLOU）代表了一种独特的燃烧方案，与传统的燃烧过程直接相关但又显着不同。它可以实现高效的化石燃料燃烧，同时将二氧化碳分离的能量损失降至最低。这个多学科团队由常规燃烧和化学循环燃烧 (CLC) 领域的六个领先的美国/中国研究小组发起，汇集了顶尖的化学工程师、热工程师、机械工程师和催化科学家，以回答燃烧中关键的、相互关联的科学问题动力学、表面反应、载氧体开发、热工程和反应器/过程建模，涵盖从原子水平到反应器和过程尺度。从拟议研究中获得的基本发现预计将显着加速 CLOU 的开发和部署，以实现集成二氧化碳捕获的高效煤炭燃烧。基础研究集中在四个方面：1）金属氧化物辅助炭/挥发性氧化方案中的晶格氧扩散、表面反应和气相燃烧动力学； 2）载氧体与煤灰和杂质的相互作用； 3) 循环流化床 CLC 反应器中载氧体稳定性和性能评估，以及 4) 反应器和过程建模。这些合作资助由 NSF 国际科学与工程部门 (ISE) 的全球风险基金 (GVF) 和CBET/ENG 燃烧与火灾以及环境可持续发展计划。