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首页> 外文期刊>Combustion Science and Technology >Numerical Predictions on the Influences of Inlet Temperature and Pressure of Feed Gas on Flow and Combustion Characteristics of Oxy-pulverized Coal Combustion
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Numerical Predictions on the Influences of Inlet Temperature and Pressure of Feed Gas on Flow and Combustion Characteristics of Oxy-pulverized Coal Combustion

机译：对氧化煤燃烧流动气体温度和进料压力压力影响的数值预测

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摘要

Carbon capture and storage employing oxy-fuel combustion is one of the most promising options to reduce greenhouse gas emission. For the transition from conventional air-fired combustion to oxy-fuel combustion, there is a necessity of detailed investigation of various phenomena that occur during oxy-fuel combustion. Numerical modeling of oxy-fuel combustion process can serve the purpose effectively and efficiently. The current paper presents a thorough numerical investigation of the combustion process of pulverized coal under oxy-fuel conditions. The influence of inlet temperature and pressure of feed gas is investigated in the present study. Computational fluid dynamics simulation is performed for the test facility located at the Institute of Heat and Mass Transfer at Aachen University. The numerical results obtained employing various Reynolds Averaged Navier Stokes (RANS) models have been compared with measured data. The results showed that the strength and axial dispersion of the internal recirculation zone (IRZ) are enhanced at higher inlet temperature. The combustion of volatile matter present in coal shifts near the burner which results in shorter flames at higher inlet temperature. The flame temperature increased by similar to 9% with increase in inlet feed gas temperature from 313 to 800 K. Inlet feed gas pressure of 10.0 bar has similar to 38% increment and similar to 32% reduction in IRZ length and flame length, respectively, than the base case.
机译：采用氧燃料燃烧的碳捕获和储存是减少温室气体排放最有前途的选择之一。对于从传统的空气燃烧到氧燃料燃烧的过渡，需要详细研究在氧气燃料燃烧期间发生的各种现象。氧燃料燃烧过程的数值建模可以有效且有效地为目的服务。本文介绍了氧气燃料条件下粉煤煤的燃烧过程的彻底数值研究。在本研究中研究了入口温度和进料气体压力的影响。对位于亚琛大学热量和传质研究所的测试设施进行计算流体动力学模拟。已经将使用各种雷诺的数值结果与测量数据进行了比较了采用各种雷诺平均的Navier Stokes（RANS）模型。结果表明，内部再循环区（IRZ）的强度和轴向分散在更高的入口温度下增强。煤中存在的挥发物质的燃烧在燃烧器附近转变，导致较短的入口温度下的火焰。火焰温度同比增加到9％，随着入口进料气体温度的增加，从313到800k增加。入口进给气体压力为10.0巴的增量类似于38％，而IRZ长度和火焰长度的减少相似。比基本案例。

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