基于光谱分析的燃煤电站锅炉火焰发射率分布研究  

Research on Furnace Flame Emissivity Distribution of a Utility Boiler based on Spectral Analysis

作　　者：亚云启 罗昭强 戴恩贤 蒋磊 陈明 袁隆基[2] YA Yun-qi;LUO Zhao-qiang;DAI En-xian;无(Ningbo Special Equipment Inspection and Research Institute;China University of Mining and Technology)

机构地区：[1]宁波市特种设备检验研究院,浙江宁波315048 [2]中国矿业大学低碳能源与动力工程学院

出　　处：《电站系统工程》2024年第6期1-4,7,共5页Power System Engineering

摘　　要：研究了基于双色法的火焰灰体特性判断方法和非线性最小二乘法在求解燃煤火焰温度和发射率过程中的差异性。用便携式光谱仪系统对一台1000 MW燃煤锅炉炉膛内不同高的火焰光谱信息进行采集,并经过光谱分离后获得火焰的连续光谱。利用上述两种方法分别求解650~900 nm内辐射光谱的温度和发射率分布,表明在标高35.1 m和37 m处利用灰体特性判断方法获得的火焰发射率分布并不满足灰性,而非线性最小二乘法的计算结果满足灰性,这说明灰性波段判断方法对判断灰性波段并不准确。将非线性最小二乘法计算出的温度结合Plank定律求出在500~900 nm波段内的发射率分布曲线,表明在500~900 nm波段内燃煤火焰并不完全满足灰性。最后分析了基于双基色法(R、G)的CCD成像法测温的可靠性。The difference between flame gray band judgment method based on two-color method and non-linear least square method in solving the temperature and emissivity of coal-flame was evaluated.A spectrometer system was used to collect flame spectrum of a 1000 MW coal-fired boiler,and a method was used to separate the continuous baseline from the measured flame spectra.The two methods were used to solve the temperature and emissivity distribution of coal flame spectrum in the range of 650-900nm.The results show that the emissivity distribution at 35.1m and 37m calculated by flame gray band judgment method does not satisfy gray property,while the emissivity distribution calculated by non-linear least squares method satisfies gray property.This indicates that the gray band judgment method is not accurate in judging the gray band.The temperature calculated by the nonlinear least square method was combined with Plank's law to find the emissivity profiles in the range of 500-900nm,indicating that the coal flame in range of 500-900nm is not completely meet the gray.The reliability of CCD imaging temperature measurement based on two-color method(R,G)was analyzed.

关 键 词：双色法 光谱分析 发射率 燃煤火焰 非线性最小二乘法 

分 类 号：TK311[动力工程及工程热物理—热能工程]