【作者】 李丽丽；

【导师】 谢安国；

【作者基本信息】 辽宁科技大学 ， 热能工程， 2008， 硕士

【摘要】 近年来,高炉煤气发电技术的应用方兴未艾,开辟了高炉煤气合理利用的新思路。燃烧高炉煤气发电主要包括全燃和混烧两种方式。实践证明,利用高炉煤气发电可大大优化企业的能源结构,降低生产成本和污染物排放,缓解用电紧张局面,取得节能、减排、增电等多重功效,为企业创造良好的经济效益和社会效益。本文采用CFD流体力学软件对某电厂130t/h燃烧煤粉与高炉煤气混合燃料锅炉和220t/h全燃高炉煤气锅炉的炉内燃烧过程进行数值模拟。首先,分析了高炉煤气的燃烧特性,论述了煤粉和高炉煤气混烧的意义和必要性。其次,通过模拟总结出煤粉和高炉煤气混烧锅炉的燃烧特点;校正所选计算模型的准确性;确定该模型燃料的较优掺烧比及影响因素;模拟得出缩腰和直筒全燃高炉煤气锅炉炉内的压力场、速度场和温度场;分析了双旋流燃烧器及卫燃带在全燃高炉煤气锅炉中的作用及意义。最后,在不同掺烧比下对炉内NO_X排放量进行模拟并比较其生成量。通过以上工作,更加直观的展示了煤粉与高炉煤气混烧锅炉和全燃高炉煤气锅炉炉内的燃烧过程。较好地将燃烧理论与数值模拟结合起来,有利于进一步发展和完善气-固两相燃料燃烧的数值模拟理论和高炉煤气发电技术。同时,也为工程上同类锅炉的优化设计、合理运行提供理论指导。更多还原

【Abstract】 In recent years, BFG power generation technology’s applications were ascendanting and created a new idea of BFG rational use. Burning BFG power generation include two ways:full firing and co-firing. Practice shows that using BFG power generation can significantly optimize the energy structure, reduce production costs and pollutant emissions and ease the tense situation of the electricity, make multiple effects including energy saving, emission reduction and so on, and make good economic and social benefits.In this paper, the combustion process in power plant of 130 t / h pulverized coal and BFG blended fired boiler and 220 t / h full BFG fired boiler were simulated by CFD software. First, analied the BFG combustion’s characteristics and dissertated the pulverized coal and BFG blended combustion’s significance and necessity. Second, summarized the combustion’s characteristics in pulverized coal and BFG blended fired boiler by numerical simulation and the accuracy of the calculation model be calibrated and determined the optimal fuel blending ratio and its influencing factors. Simulated lumbar and Zhitong full BFG fired boiler furnace’s pressure field, velocity and temperature fields; and analysised the dual-swirl burner and stable combustion zone in the entire BFG fired boiler in the role and significance. Finally, the NO_x emissions were simulated and compared at different blending rations.Through the above work, the combustion process of pulverized coal and BFG blended fired boiler and full BFG fired boiler be displaied directly. The combustion theory and numerical simulation are integrated perfectly by the above work. It is good for the further development and consummation of the two-phase fuel combustion theory and numerical simulation of BFG power generation technology. At the same time, the study also provides reasonable theoretical guidance for similar boiler’s optimization design and operation更多还原