增压锅炉燃烧监测试验研究

增压锅炉是船用蒸汽动力装置中的700 K左右,而在高负荷运行时火焰温度约为1 900 K,辐射温度与数值模拟结果吻合较好;同时,对锅炉6种不同运行负荷下火焰辐射能信号监测分析发现,辐射能信号与过热蒸汽温度和烟气温度的变化趋势也基本一致,有利于将辐射能作为反馈信号引入到控制系统中,从而优化锅炉控制.

Experimental Study of the Combustion Monitoring of a Supercharged Boiler

Supercharged boilers are key equipment items in a marine steam power plant and it is necessary to conduct a real-time monitoring of the in-furnace combustion to secure their good reliability and high cost-effectiveness.During the test,the authors have first employed an image acquisition system to capture the flame images at various loads of the boiler and then used image processing technology to obtain the radiation temperature of the flame and the radiant energy magnitudes characterizing the in-furnace combustion intensity.It has been found that during a normal operation,the boiler flame temperature is approximately 1700 K,while at a high load,the temperature is about 1900 K.The radiation temperature is in relatively good agreement with the numerical simulation results.In the meantime,it has been found by monitoring and analyzing the boiler flame radiant energy signals at six operating loads that the radiant energy signals assume a basically same variation tendency as the superheated steam and flue gas temperature,facilitating the introduction of the radiant energy into the control system as a feedback signal and thereby optimizing the boiler control.