基于炉膛温度场的超超临界锅炉燃烧调整试验研究及优化分析  

Experimental Study and Optimization Analysis of Ultra-supercritical Boiler Combustion Adjustment Based on Temperature Field in Furnace

作　　者：王欢 WANG Huan(North China Electric Power Experimental Research Institute,China Datang Corporation Science and Technology General Research Institute Ltd.,Beijing 100040,China)

机构地区：[1]中国大唐集团科学技术研究总院有限公司华北电力试验研究院,北京100040

出　　处：《动力工程学报》2024年第11期1689-1695,共7页Journal of Chinese Society of Power Engineering

摘　　要：火力发电机组在运行过程中燃烧温度场分布不均,会导致炉膛受热面超温、爆管以及形成烟气走廊等问题。通过对运行过程中锅炉温度场分布的判断,及时关注其运行状况并进行燃烧调整,以提高锅炉运行的安全性、稳定性和经济性。以某发电厂660 MW超超临界锅炉为例进行燃烧优化调整试验及数值模拟。结果表明:通过对各受热面温度以及燃烧器处壁温变化进行分析,同时结合制粉系统各粉管风速及煤粉浓度的偏差、燃烧器内和外二次风风量及强度、直流风风量大小的调整以及炉膛贴壁风的测量,发现不同磨煤机运行组合方式以及二次风配风方式等因素对锅炉运行存在较大影响,具体表现为壁温超温、燃烧器温度以及受热面还原性气氛等方面,进而影响锅炉的经济运行;调整后屏式过热器、高温过热器和高温再热器壁温超温现象消失,燃烧器不存在烧损情况,NOx生成量也在合理的范围内。Due to the uneven distribution of combustion temperature field in the operation processes of thermal power plants,issues such as over-temperature,tube explosion and flue gas corridor of the furnace heating surfaces may occur.By evaluating the temperature field distribution of the boiler during operation processes,the combustion adjustment can be made to improve the safety,stability and economy of the boiler operation when the operation status can be examined timely.With the boiler of a 660 MW ultra-supercritical power plant as an example,the combustion optimization adjustment test and simulation were carried out.Temperature of heating surfaces and the wall temperature change at the burner were analyzed,and the wind speed and pulverized coal concentration deviations of powder pipes in the pulverizing system,internal and external secondary air volume and intensity of the burner,the adjustment of the direct current air volume,and the wall air in the furnace were measured.Results show that the factors,such as the combination operation modes of different coal mills and the modes of secondary air distribution have a great impact on the boiler operation.In particular,the wall over-temperature,the burner temperature and reducing atmosphere on the heating surface are influenced,which will affect the boiler economic operation.After adjustment,the wall over-temperature phenomenon of the screen superheater,high temperature superheater and high temperature reheater disappears,there is no burnout of burners,and the amount of NO x generation is also within a reasonable range.

关 键 词：超超临界锅炉 壁温超温 燃烧调整试验 优化分析 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程]