对冲燃煤锅炉燃烧过程数值模拟及沾污分析.docxVIP

对冲燃煤锅炉燃烧过程的数值模拟及沾污分析摘要火电机组不断朝着高参数、大容量的方向发展，锅炉燃烧系统变煤种运行特性分析是一个重要的研究课题。本文以600MW对冲锅炉燃烧系统为研究对象，利用计算流体动力学软件FLUENT对一台600MW对冲煤粉炉内燃烧过程进行数值模拟，为简化模拟的过程，采用单流体湍流流动模型及能量方程，计算得出在额定工况下炉内各截面的温度场，速度场，静压场等。然后在燃用贫煤时，在不同的一、二次风速情况下对锅炉的运行工况进行模拟，得出各种工况下的温度场，速度场，压力场等，分析在何种工况下对锅炉运行最有利，结果表明，在额定工况下燃烧情况最好，其温度，速度场与实际情况比较符合。在不同一、二次配风下模拟时，可以看出在这几种不同工况下的燃烧过程的区别。通过分析比较可以得到贫煤燃烧在其推荐的一、二次配风速度区域间燃烧情况最好。本文的研究表明，炉膛内的结渣情况，并提出了相应的措施，这些措施对锅炉的设计以及防止炉膛结渣、提高锅炉的燃烧效率和减少锅炉运行时事故的发生具有很强的指导性意义。关键词：对冲锅炉;炉内燃烧; 数值模拟; 炉膛受热面分析NUMERICAL SIMULATION OF A HEDGE BOILER COMBUSTIONPROCESSAND?CONTAMINATION?ANALYSISABSTRACTFossil fired power units go forward to high parameters and large capacity gradually, the analysis on operation characteristics of the combustion system of the coal-fired boiler changing to different coal sorts is an important subject for research. The combustion system of 600MW coal-fired boiler is taken as the research object of this thesis，using computational fluid dynamics software FLUENT Hedge against a 600MW pulverizedcoal combustion process is simulated,to simplify the simulation process,single-fluid turbulent flow model and energy equation is applied,calculated at rated operating conditions of various sections of the furnace temperature, velocity, pressure distribution, etc.Then when burning lean coal,simulate on the boiler operating conditions in different first and second wind velocity,draw a variety of different conditions of temperature, velocity, pressure field, etc.analysis in what condition of the boiler to run the most favorable,results indicate that the combustion condition rated the best, its temperature, velocity field more in line with the actual situation. In different first and second simulation with wind, you can see several different conditions in that the difference between the combustion process.Through analysis and comparison of coal combustion can be recommended in its first and second wind speed with the best in the region between the combustion.This thesis shows ,for question to ana