SusChEM: Co-firing Biomass and Coal under Pressurized Oxy-fired Combustion Conditions

1604630 Eddings，Eric G.使用生物质作为与煤共烧的燃料是减少燃煤发电产生的净CO2的可行选择。富氧燃烧也被认为是增强碳捕获和储存（CCS）的潜在近期选择，其通过产生高浓度CO2流，由于使用氧气和再循环烟道气（主要是CO2）的燃料燃烧，所述高浓度CO2流可以更容易地回收。循环流化床（CFB）锅炉非常适合利用低质量和高质量的煤，并且可以适应广泛的生物质原料。煤粉（PC）锅炉代表了最广泛的类型的燃煤燃烧系统用于发电，并已成为许多生物质共烧示范的主题。此外，在高压下使用氧燃烧允许改进CCS发电的热力学效率，以及增加CO2的分压以促进CCS。因此，这些不同技术的整合为解决温室气体控制的迫切需要提供了一个很好的机会。犹他州大学、浙江大学和怀俄明州大学在粉煤（PC）和循环流化床（CFB）系统方面拥有丰富的研究经验，可以研究与富氧燃烧集成相关的基本方面。高压操作下生物质和煤炭的共燃。该项目将利用实验室规模的高压反应器在循环流化床和PC燃烧条件下进行研究。该项目的重点是对2个关键研究领域的基础研究，这些领域必须在高压、富氧燃料PC和CFB燃烧器中广泛采用生物质/煤共燃之前得到解决。这些领域是：1）加压富氧条件下生物质/煤共热解和共燃烧的基本特性; 2）煤和生物质加压富氧共燃烧过程中矿物质的转化。这项工作代表了3种不同技术的联系：煤/生物质混合燃烧，氧燃料燃烧和高压燃烧。虽然已经发表了一些关于这些技术中的每一种或其中两种技术的组合的研究，但文献中没有关于所有3种技术组合的基本信息。该项目将通过对PC燃烧和CFB燃烧方案的这些组合技术的详细调查来解决这一科学空白。这项研究将为扩大生物质发电的利用奠定基础，特别是在高效率条件下，这将对减少世界温室气体排放作出重大贡献。由于中国目前在实施循环流化床发电技术方面处于世界领先地位，而且每年新建的燃煤发电系统的数量也处于世界领先地位，因此它们的参与将为商业采用拟议技术提供潜在途径

1604630 Eddings, Eric G.The use of biomass as a co-firing fuel with coal is a viable option for reducing net CO2 production from coal-fired power generation. Oxy-combustion is also considered a potential near-term option for enhancing carbon capture and storage (CCS), by producing a high concentration CO2 stream that can be more readily recovered due to combustion of fuels using oxygen and recycled flue gas (primarily CO2). Circulating fluidized-bed (CFB) boilers are well-suited for utilizing low- and high-quality coals, and can adapt to a wide range of biomass feedstocks. Pulverized-coal (PC) boilers represent the most widespread type of coal-fired combustion system used for power generation, and have been the subject of many biomass co-firing demonstrations. In addition, the use of oxy-combustion at high pressures allows for improved thermodynamic efficiencies for power generation with CCS, as well as increased partial pressure of CO2 to facilitate CCS. Thus, the integration of these various technologies provides a great opportunity to address the pressing need of greenhouse gas control. The University of Utah, Zhejiang University and the University of Wyoming have considerable research experience, in both pulverized-coal (PC) and circulating fluidized-bed (CFB) systems, to investigate fundamental aspects related to the integration of oxy-fired combustion with co-firing of biomass and coal under high-pressure operation. The project will utilize bench-scale high-pressure reactors to perform research under both CFB and PC-fired combustion conditions. The project focuses on fundamental investigations of 2 key research areas that must be addressed before widespread adoption of biomass/coal co-firing in high-pressure, oxy-fuel PC and CFB combustors can be realized. These areas are: 1) fundamental characteristics of biomass/coal co-pyrolysis and co-combustion under pressurized oxy-fuel conditions, and 2) mineral matter transformations during pressurized oxy-fuel co-firing of coal and biomass. The work represents the nexus of 3 different technologies: coal/biomass co-firing, oxy-fuel combustion and high-pressure combustion. While there have been some studies published on each of these technologies, or combinations of two of them, there is no fundamental information in the literature on the combination of all 3 technologies. This project will address this scientific void through a detailed investigation of these combined technologies for both PC-fired and CFB combustion scenarios. The research will lay a foundation for the expansion of biomass utilization in power generation, particularly under high-efficiency conditions, which would make a significant contribution to reductions in the world's greenhouse gas emissions. Since China is currently a world leader in the implementation of CFB technology for electric power generation, and is also one of the world leaders in the number of new PC-fired power generation systems being constructed each year, their participation will provide a potential pathway for commercial adoption of the proposed technologies