高压高湿氧燃烧条件下合成气层流同轴射流火焰特性

为了实现能源的高效利用和缓解全球变暖，申请者提出了基于煤基合成气-氧-水蒸气燃烧方式的近零排放发电系统（OCCSS）。煤基合成气在高温、高压、高水蒸气浓度与高氧浓度（"四高"）条件下燃烧，对做功后的烟气（约90%H2O，10%CO2）进行物理冷凝，可同时实现高发电效率和CO2的近零排放。本项目针对OCCSS燃烧环境下煤基合成气层流同轴射流火焰特性进行研究。研究高压高湿氧燃烧条件下合成气同轴射流火焰的稳定现象、火焰结构，建立"四高"条件下层流同轴射流燃烧火焰计算模型，揭示其详尽燃烧过程；解析CO的反应机理。本项目的研究对成功研发OCCSS燃烧系统和丰富燃烧学知识体系具有重要的科学意义。

For the efficient use of energy and global warming mitigation, Oxy-coal combustion steam system of near-zero emissions (OCCSS) was proposed. The syngas from coal burns with pure oxygen with the presence of steam under high pressure, high preheat temperature conditions (namely "four high" condition), then the gas goes to a turbine. The exhaust gas from the turbines is condensed into water and high concentrations of CO2 which enables high conversion efficiency and near-zero emission of CO2 simultaneously. This project studies the laminar diffusion flame characteristics of syngas under "four high" condition, including the co-flowing flame stability, the co-flowing flame structure and the CO reaction mechanism of syngas diffusion flame. The laminar computation model will be established for "four high" conditions to understand the combustion process in detail. This study will lay a solid theoretical foundation for the successful development of OCCSS system and is expected to broaden the knowledge of combustion.