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Numerical studies of pulverized coal combustion in a tubular coal combustor with slanted oxygen jet

机译：倾斜射流的管状燃烧室煤粉燃烧的数值研究。

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A pure two-fluid model for turbulent reacting gas-particle flow of coal particles is developed using a unified Eulerian treatment of both the gas and particle phases. The particles' history caused by mass transfer due to moisture evaporation, devolatilization and char reaction is described. Both velocity and temperature of the coal particles and the gas phase are predicted by solving the momentum and energy equations of the gas and particle phases, respectively. A k―ε―k_k two-phase turbulence model, EBU―Arrhenius turbulent combustion model and four-flux radiation heat transfer model are incorporated into a comprehensive model. The above comprehensive mathematical model is used to simulate two-dimensional gas-particle flows and pulverized coal combustion in a newly designed tubular oxygen―coal combustor of blast furnace. Predicted results of isothermal gas-particle flows are in good agreement with those obtained by measurements. The results also show that the proposed tubular oxygen―coal combustor prolongs the coal particle residence time and enhances the mixing of coal and oxygen. Results indicate that smaller coal particles of 10 μm diameter are heated and devolatilized rapidly and have volatile combustion in the combustor, while larger coal particles of 40 and 70 μm in diameter are heated but not devolatilized, and combustion of such particles does not occur in the tubular combustor.
机译：通过对气相和颗粒相进行统一的欧拉处理，建立了纯净的两流体模型，用于煤颗粒的湍流反应气体颗粒流。描述了由于水分蒸发，脱挥发分和炭反应引起的传质导致的颗粒历史。分别通过求解气相和颗粒相的动量方程和能量方程来预测煤颗粒和气相的速度和温度。将k-ε-k_k两相湍流模型，EBU-Arrhenius湍流燃烧模型和四通量辐射传热模型合并到一个综合模型中。上面的综合数学模型被用来模拟二维设计的高炉管式氧气-煤燃烧室中的二维气体颗粒流和煤粉燃烧。等温气体颗粒流量的预测结果与通过测量获得的结果非常吻合。结果还表明，所提出的管式氧气-煤燃烧器延长了煤颗粒的停留时间并增强了煤与氧气的混合。结果表明，直径为10μm的较小煤颗粒在燃烧室中迅速加热并挥发，并在燃烧室中发生挥发燃烧，而直径为40和70μm的较大煤颗粒被加热但未挥发，并且在燃烧室中不会发生这种燃烧。管状燃烧器。

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