1000 MW超临界锅炉一次风烟气再循环特性研究  

Study on Primary Air Flue Gas Recirulation Characteristics of 1000MW Supercitical Boiler

作　　者：张中林 ZHANG Zhonglin(School of Energy and Power Engineering,Nanjing Institute of Technology,Nanjing 210036,China)

机构地区：[1]南京工程学院能源与动力工程学院,江苏南京210036

出　　处：《锅炉技术》2023年第2期26-31,共6页Boiler Technology

摘　　要：以某1000 MW超临界锅炉为研究对象,对深度调峰条件下锅炉一次风掺混烟气的特性进行了试验和模拟研究。基于不同的过量空气系统,提出了2种不同的一次风烟气再循环方案,并建立了相关数值模型。通过低负荷阶段锅炉脱硝装置入口温度和NO_(x)入口浓度实验值和模拟值的比较,验证了数值模型的正确性和精度。通过数值模型,研究了2种不同掺混方案下炉膛内温度分布以及NO_(x)排放特性和差异,结果表明:采用一次风烟气再循环能够提高炉膛出口温度,降低出口NO_(x)浓度,从而提高了深度调峰条件下机组灵活性。研究结果对类似机组的灵活性改造具有参考意义。Taking a 1000MW supercritical boiler as the research object,the characteristics of primary air mixed with flue gas of the boiler under the condition of deep peak shaving are tested and simulated.Based on different excess air systems,two different primary air flue gas recirculation schemes are proposed,and the relevant numerical models are established.The correctness and accuracy of the numerical model are verified by comparing the experimental and simulated values of the inlet temperature in the furnace and NO_(x)concentration of the boiler denitration device at the low loads.Through the numericalz model,the temperature distribution in the furnace and NO_(x) emission characteristics and its differences under two different mixing schemes are studied.The results show that the primary air flue gas recirculation can increase the furnace outlet temperature and reduce the outlet NO_(x) concentration,so as to improve the flexibility of the unit under the condition of deep peak shaving.The research results have reference significance for the flexible transformation of similar units.

关 键 词：超临界 深度调峰 一次风 烟气再循环 数值模拟 

分 类 号：TK223[动力工程及工程热物理—动力机械及工程]