基于烟气再循环的浸没燃烧器低NO_(x)燃烧改造研究  

Research on Low-NO_(x) Combustion Modification of Submerged Burner Based on Flue Gas Recirculation

作　　者：刘平 王敏 张文振 初伟 周末 LIU Ping;WANG Min;ZHANG Wenzhen;CHU Wei;ZHOU Mo(China Longyuan Power Group Corporation Limited,Yantai,Shandong 264006)

机构地区：[1]烟台龙源电力技术股份有限公司,山东烟台264006

出　　处：《能源科技》2024年第6期40-44,50,共6页Energy Science and Technology

基　　金：国家重点研发计划项目(2022YFB4100304)。

摘　　要：针对当前SCV浸没燃烧器运行状态下NO_(x)排放较高的问题,提出一种能够兼顾浸没燃烧器降氮与提高浸没汽化器传热特性双重作用的烟气再循环低氮燃烧改造方案。通过数值模拟方法评估预测该方案降氮效果,并研究了烟气再循环改造前后浸没燃烧器燃烧特性与NO_(x)排放特性。结果表明:基于数值模拟方法可确定SCV浸没燃烧器最佳烟气再循环比例,当选择适宜的烟气再循环比例(10%~20%)进行低氮燃烧改造时,因适当降低浸没燃烧器燃烧区域氧量及温度峰值,热力型NO_(x)减排率高于65%。此外,由于燃烧系统增加了烟气量,有利于水浴内换热。To cope with the problem of high NO_(x) emission under the current operating condition of SCV sub⁃merged burner,this paper describes a low-NO_(x) combustion modification scheme based on flue gas recircula⁃tion,taking into account the nitrogen reduction of submerged burner and improvement of heat transfer feature of submerged vaporizer.The nitrogen reduction effect of the scheme is evaluated and predicted by numerical simulation,and the combustion and NO_(x) emission characteristics of the submerged burner before and after the flue gas recirculation modification are studied.The result shows that the best flue gas recirculation ratio of the SCV submerged burner can be derived from the numerical simulation method.When a suitable flue gas recirculation ratio(10%-20%)is selected for low-NO_(x) combustion modification,the thermal NO_(x) emission re⁃duction rate is higher than 65%due to the appropriate reduction of the oxygen and temperature peak in the combustion region of submerged burner.Furthermore,the increased flue gas volume of the combustion system facilitates heat exchange within the water bath.

关 键 词：SCV 浸没燃烧器 烟气再循环 低氮燃烧 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]