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

1604630埃丁斯，Eric G.使用生物质作为与煤共燃的燃料是减少燃煤发电净二氧化碳排放的一个可行的选择。氧气燃烧也被认为是加强碳捕获和储存(CCS)的一种潜在的短期选择，因为它产生了高浓度的二氧化碳气流，由于使用氧气和循环烟道气(主要是二氧化碳)燃烧燃料，可以更容易地回收。循环流化床(CFB)锅炉非常适合利用低质和优质煤，并能适应广泛的生物质原料。煤粉(PC)锅炉是用于发电的最广泛的燃煤燃烧系统，也是许多生物质联合燃烧演示的主题。此外，在高压下使用氧气燃烧可以提高CCS发电的热力学效率，并增加二氧化碳分压以促进CCS。因此，这些不同技术的集成为解决温室气体控制的迫切需求提供了一个很好的机会。犹他大学、浙江大学和怀俄明大学在煤粉(PC)和循环流化床(CFB)系统方面都拥有丰富的研究经验，以研究高压下氧燃烧与生物质和煤共燃的相关基本方面。该项目将利用实验室规模的高压反应堆在循环床和燃煤燃烧条件下进行研究。该项目专注于两个关键研究领域的基础调查，这两个领域必须解决，才能实现在高压、富氧燃料PC和循环床燃烧器中广泛采用生物质/煤共燃。这些方面是：1)生物质/煤共热解和加压富氧条件下共燃的基本特征，以及2)煤和生物质加压富氧共燃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/生物质联合燃烧、富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这三种技术的组合的基本信息。该项目将通过详细调查这些用于燃煤和循环床燃烧方案的组合技术来解决这一科学空白。这项研究将为扩大生物质在发电中的利用奠定基础，特别是在高效条件下，这将为减少世界温室气体排放做出重大贡献。由于中国目前是实施循环床发电技术的世界领先者，也是每年新建PC发电系统数量的世界领先者之一，他们的参与将为拟议技术的商业采用提供一条潜在的途径

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