水泥预分解窑系统氧燃烧富集CO2的机理研究

The cement industry has become the second largest industrial source of CO2 emissions just after the thermal power generation in China. It's of great significance in using oxy-fuel combustion for reducing CO2 emissions. This project will study the progress of oxy-fuel combustion in precalciner, in which about 80% CO2 generated. Especially, the cement raw material decomposition, pulverized coal combustion characteristics and mechanism in the condition of high CO2 concentration and high ratio of raw material to pulverized coal (about 10). The microscopic reaction and coupling mechanism of cement raw material and pulverized coal will be investigated through the variation laws of particle chemical composition, surface functional groups, pore structure, the physical morphology and so on. A coupled kinetic mechanism model will be built to describe the progresses of cement raw material decomposition, pulverized coal combustion in the atmosphere of O2/CO2. Accordingly, the dynamic experiment results will be analyzed by the model and fitted by nonlinear regression to provide estimates of the relevant kinetic parameters. And then the effects of process parameters on the cement raw material decomposition, pulverized coal combustion characteristics will be investigated with numerical simulation method. All of the above will provide theoretical basis for the development of cost-effective process routes of oxy-fuel combustion in the cement industry.

水泥工业已成为居火力发电之后的工业生产第二大CO2排放源，其采用氧燃烧富集CO2对我国碳减排意义重大。本项目将对产生预分解窑系统80%CO2排放量的分解炉氧燃烧过程中，在炉内高CO2浓度、高生料/煤粉比（10左右）环境下，水泥生料分解、煤粉无焰燃烧的特性和机理进行深入而系统的实验和理论研究；通过考察颗粒化学组分、表面官能团、孔结构分布及物理形貌等变化规律阐释水泥生料和煤粉在分解炉O2/CO2燃烧下的微观反应机理和耦合机制，建立O2/CO2气氛下生料分解与煤粉燃烧耦合动力学机理模型，确立反应动力学参数；采用数值模拟方法揭示炉内氧燃烧的物理化学过程变化规律及工艺参数的影响规律，为分解炉氧燃烧方式下经济高效工艺的制定提供理论依据。

水泥工业已成为居火力发电之后的工业生产第二大CO2排放源，其采用氧燃烧富集CO2技术对我国碳减排意义重大。本项目对产生预分解窑系统80%CO2排放量的分解炉氧燃烧过程中，在炉内高CO2浓度、高生料/煤粉质量比（生料/煤粉=10）环境下，水泥生料分解、煤粉无焰燃烧的特性和机理进行了深入而系统的实验和理论研究；通过考察颗粒化学组分、孔结构分布及物理形貌等变化规律阐释水泥生料在分解炉O2/CO2燃烧下的微观反应机理，建立了O2/CO2气氛下生料分动力学机理模型，确立反应动力学参数；研究了O2/CO2气氛下生料分解与煤粉混合燃烧时NOx的排放规律；同时对比探究了O2/CO2气氛下生料分解过程中影响预分解窑结皮特性的有害物质碱、氯、硫的挥发特性，为分解炉富氧燃烧方式下经济高效安全的生产工艺的制定提供理论依据。