洁净煤技术

2021, v.27;No.132(02) 225-230

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加压循环流化床富氧燃烧中试研究
Pilot-scale study on pressurized oxy-fuel combustion in circulating fluidized bed

孔润娟;李伟;任强强;刘志成;
KONG Runjuan;LI Wei;REN Qiangqiang;LIU Zhicheng;Institute of Engineering Thermophysics,Chinese Academy of Science;University of Chinese Academy of Science;

摘要(Abstract):

二氧化碳捕集和封存技术(CCUS)是减少温室气体排放,实现全球环境可持续发展的有效技术手段。加压富氧燃烧技术是一种低成本CCUS技术。循环流化床燃烧技术(CFB)是目前商业化程度最好的清洁煤燃烧技术之一,加压循环流化床富氧燃烧耦合了加压富氧燃烧和循环流化床燃烧的诸多优点,具有很强的工业应用前景。但加压循环流化床富氧燃烧系统结构复杂,燃烧工况的切换和烟气再循环导致其在启动、控制、运行等方面面临巨大挑战。目前对于加压循环流化床富氧燃烧的研究大多处于理论建模、机理研究和小试试验阶段。为了更深入地探究加压循环流化床富氧燃烧的启动和运行方法,中国科学院工程热物理研究所在MW级加压循环流化床富氧燃烧中试试验平台上进行了中试研究,实现了加压富氧燃烧的稳定运行,获得了中试尺度加压富氧燃烧运行模式,以及启动和运行过程中温度、压力、给煤量和风量的变化曲线。加压富氧燃烧工况运行中整体O_2体积分数为29%,压力为0.30 MPa,功率为0.84 MW,尾部烟气中CO_2体积分数达91%,可较好地实现CO_2产品的捕集和压缩纯化。中试尺度加压富氧燃烧启动和运行的主要流程为:启动阶段—常压O_2/N_2燃烧阶段—常压富氧燃烧—加压富氧燃烧阶段,各阶段切换平稳。
Carbon dioxide capture,utilization and storage(CCUS) is an effective technology to reduce greenhouse gas emissions and achieve sustainable development of the global environment. Pressurized oxy-fuel combustion technology is a low-cost CCUS technology.Circulating fluidized bed combustion technology( CFB) is one of the most commercialized clean coal combustion technologies. The pressurized CFB oxy-fuel combustion combines many advantages of pressurized oxy-fuel combustion and CFB combustion,which has a strong industrial application prospect. However,the complex structure,the switching of combustion conditions and the flue gas recirculation lead to the great challenges in the start-up,control and operation of the pressurized CFB oxy-fuel combustion system. At present,most of the researches on pressurized CFB oxy-fuel combustion are in the stage of theoretical modeling,mechanism research and bench-scale test. In order to further explore the start-up and operation methods of pressurized CFB oxy-fuel combustion,the pilot-scale experiment was carried out in a pilot test platform of MW pressurized CFB oxy-fuel combustion by Institute of Engineering Thermophysics,Chinese Academy of Sciences. The stable operation of pressurized oxy-fuel combustion was realized,and a pilot-scale pressurized oxy-fuel combustion operation mode and the variation curves of temperature,pressure,coal feed rate and air volume during start-up and operation were obtained.During the pressurized oxy-fuel combustion,the overall oxygen volume fraction reaches 29%,the operation pressure is 0. 30 MPa,the power is 0.84 MW,and the CO_2 volume fraction of the tail gas reaches 91%,which is benefit to the capture and compression purification of CO_2 product. The main process of the pilot-scale pressurized oxy-fuel combustion operation mode is as follows: start-up stage-atmospheric O_2/N_2 combustion stage-atmospheric oxy-fuel combustion-pressurized oxy-fuel combustion stage,and each stage switches stably.

关键词(KeyWords): 加压富氧燃烧;循环流化床锅炉;中试试验;运行模式
pressurized oxy-fuel combustion;circulating fluidized bed boiler;pilot-scale experiment;operation mode

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划资助项目(2018YFB0605303)

作者(Author): 孔润娟;李伟;任强强;刘志成;
KONG Runjuan;LI Wei;REN Qiangqiang;LIU Zhicheng;Institute of Engineering Thermophysics,Chinese Academy of Science;University of Chinese Academy of Science;

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DOI: 10.13226/j.issn.1006-6772.CCUS20120301

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