锅炉燃烧论文：大机组锅炉燃烧优化研究[精选].doc

锅炉燃烧论文：大机组锅炉燃烧优化研究 【中文摘要】在我国,火力发电占电力供应的主要地位。随着电力工业以及国民经济的发展,能源消耗剧增,并且也带来了一系列的污染物排放问题。节能减排正在日益受到全社会的重视。对于我国电力行业来说,由于燃用煤质多变,以及锅炉实际运行中,设备改造、变符合运行、热力试验周期长等原因,存在锅炉燃烧达不到最佳的现象,甚至出现安全问题,迫切需要优化运行来提高锅炉机组的安全性、经济性和环保性。而常规的燃烧调整试验不仅消耗大量人力、物力、财力,而且周期长,所得数据有很大的局限性和经验性。随着燃烧理论以及计算机技术、计算燃烧学、计算传热学的日益发展,一些计算流体力学商业软件也随之开发应用,数值模拟技术在电力行业中正在发挥着重要作用。本文利用商业软件FLUENT对某电厂600MW超临界锅炉机组进行了不同工况下炉内燃烧过程的数值模拟研究,得到了炉内温度场、速度场以及燃烧产物的组分浓度分布,通过对比分析,找出了锅炉的最佳运行工况,并进行了试验验证。文中针对锅炉的实际情况,模拟了停运不同层一次风的六种工况,指出了停运最上层一次风为较优运行方式,在此基础上研究了氧量变化以及不同二次风分配对锅炉燃烧以及NO_X排放的影响,研究结果表明:维持锅炉运行氧量在3.5%左右,适当增大紧凑燃尽风(CCOFA)的风量,并减小分离燃尽风(SOFA)的风量可以较好的满足锅炉经济性和环保性的要求。本文的研究成果可以用来指导锅炉的优化运行。 【英文摘要】In our country, the thermal power takes of a dominant position in the electricity supply. As the development of the power industry and the national economy, energy consumption is increasing sharply, and also brings a series of pollutant emissions. Energy saving and ejection decreasing is growing attention by the whole society.For our country抯 electric power industry, the phenomenon that boiler combustion can not reach the best state and even security problems is usual, because of coal changeable, equipment modification, variable load operation, and the interval cycle of thermal experiment is long, etc. So, it is urgent to optimize operation to improve the unit抯 security, economy and environmental protection. The conventional combustion adjustment experiment not only need a lot of human, materical and financial resources, and the cycel is long, income data has a lot of empirical and limitations. With the fast development of combustion theory, computer technology, computation combustion study and computation heat transfer theory, some commercial softwre of CFD has been development and application as well as, the numerical simulation technology is playing an increasingly important role in the power industry.This thesis does simulation research of boiler combustion under different operation conditions though FLUENT business software to one power plant