1000MW塔式炉燃烧系统建模及低氮高效燃烧策略研究  

Modeling of 1000 MW tower boiler combustion system and study on low-NO_(x)high-efficiency combustion strategy

作　　者：丁旭 付康康 康博士 李旭辉 王进仕[1] 邱斌斌 DING Xu;FU Kangkang;KANG Boshi;LI Xuhui;WANG Jinshi;QIU Binbin(School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China;Guoneng Nanning Power Generation Company Limited,Nanning 530317,China)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]国能南宁发电有限公司,南宁530317

出　　处：《综合智慧能源》2024年第12期36-44,共9页Integrated Intelligent Energy

基　　金：国家重点研发计划项目(2022YFB4100700)。

摘　　要：塔式炉由于炉膛高度高、燃烧器层数多,传统控制难以在锅炉宽负荷运行时,实现效率与NO_(x)排放的最佳匹配。为解决这一问题,基于Simulink软件建立了某1000 MW塔式炉炉膛燃烧的一维动态模型并进行了稳态验证。通过分析锅炉在改变燃尽风(OFA)比例、过量空气系数及主燃区配风方式时的燃烧特性,制定了覆盖100%~40%汽轮机热耗率验收(THA)工况范围的低氮高效燃烧策略。以10%THA为间隔,对比了燃烧优化前后锅炉在稳态工况下的NO_(x)质量浓度和未燃尽率。结果表明,优化后煤粉燃尽率最高提升了1.14%,NO_(x)质量浓度在高负荷(≥70%THA)工况下显著降低,最大降幅达到29 mg/m^(3)。此外,计算显示优化后的锅炉平均综合经济收益增加了577元/h,显著提高了锅炉的经济效益,优化效果明显,为后续建立锅炉燃烧闭环控制系统提供了理论支撑和模型。Due to the high boiler height and multiple burner layers in tower boilers,traditional control methods struggle to achieve an optimal balance between efficiency and NO_(x)emissions across a wide load range.To address this issue,a one-dimensional dynamic combustion model of a 1000 MW tower boiler was developed using Simulink software and validated under steady-state conditions.By analyzing the combustion characteristics under varying burnout air ratios,excess air coefficients,and air distribution modes in main combustion zones,a low-NO_(x),high-efficiency combustion strategy was devised for loads ranging from 100%THA to 40%THA.At intervals of 10%THA,the NO_(x)concentration and unburned carbon rate of the boiler under steady-state conditions were compared before and after combustion optimization.Results showed that after optimization,the coal burnout rate improved by up to 1.14%,and NO_(x)concentrations significantly decreased at high loads(≥70%THA),with a maximum reduction of 29 mg/m^(3).Additionally,the optimized boiler demonstrated an average overall economic gain of 577 yuan/hour,significantly enhancing its economic efficiency.This optimization provides a theoretical foundation and model for establishing a closed-loop combustion control system for boilers.

关 键 词：燃烧优化 NO_(x)排放 塔式锅炉 超超临界锅炉 一维燃烧模型 低氮高效燃烧 

分 类 号：TK123[动力工程及工程热物理—工程热物理]