等离子点火锅炉氮氧化物排放的数值模拟研究  

Numerical Simulation of NO_(x) Emission from Plasma Ignition Boiler

作　　者：谭文 祝朝阳 蔡巍 宋继坤 TAN Wen;ZHU Chaoyang;CAI Wei;SONG Jikun(State Grid Energy Hefeng Coal Power Co.Ltd.,Tacheng 834411,China;Yantai Longyuan Power Technology Co.Ltd.,Yantai 264006,China)

机构地区：[1]国网能源和丰煤电有限公司,新疆塔城834411 [2]烟台龙源电力技术股份有限公司,山东烟台264006

出　　处：《工业加热》2024年第10期14-19,共6页Industrial Heating

摘　　要：等离子点火技术成功地应用于各类燃煤锅炉中,大大提高了点火成功率及运行经济性,而氮氧化物排放是锅炉运行中面临的重要问题,开展等离子点火锅炉内氮氧化物排放特征的研究十分有意义。采用数值模拟方法,研究了不同等离子点火功率下锅炉燃烧特征,获得锅炉内流场及温度分布。通过分别采用三种氮氧化物生成机理,获得不同点火功率下三种类型氮氧化物的贡献比例和变化趋势。等离子点火功率的升高对炉膛内流场影响较小,但会明显提高炉膛内的平均温度,扩大高温区范围。随着等离子点火功率的升高,燃料型氮氧化物生成量降低,热力型氮氧化物生成量升高,氮氧化物的总生成量降低。Plasma ignition technology has been successfully applied in various types of coal-fired boilers,which greatly improves the ignition success rate and operation economy.NO_(x) emission is an important issue in boiler operation,thus it is very meaningful to carry out the research on the characteristics of NO_(x) emission in the plasma ignition boiler.Numerical simulation was used to study the combustion characteristics of the boiler under different plasma ignition powers,obtaining the flow field and temperature distribution in the boiler.By adopting three types of NO_(x) generation mechanisms,the contribution ratios and trends of the three types of NO,under different ignition powers were obtained.The in-crease of plasma ignition power has a small effect on the flow field inside the furnace chamber,but it will obviously increase the average tem-perature inside the chamber and expand the range of high-temperature zone.With the increase of plasma ignition power,the fuel type NO_(x) generation decreases,the thermal type NO,generation increases,and the total NO_(x) generation decreases.

关 键 词：等离子点火 锅炉 数值模拟 氮氧化物 

分 类 号：TK224.1[动力工程及工程热物理—动力机械及工程]