飞灰辐射特性与表面温度关联的实验研究

Experimental Research for Correlation Between Radiation Characteristic and Surface Temperature of Fly Ash

为降低燃煤、垃圾焚烧和生物质锅炉高温换热器传热管失效泄漏甚至爆管的风险,提出基于高温内窥镜光学测温方法的高温换热器表面积灰和温度状态监测系统。采用多元扩散Hencken燃烧器和细颗粒振荡给粉技术,开展了3种飞灰可见光段辐射特性与温度的关联规律研究。结果表明:由于3种飞灰理化性质不同,其辐射-温度关联曲线区别明显;光学频道选择不同也会显著影响结果的准确性,在实际应用前应进行系统的实验室标定,以获取更为精确的结果。

In order to reduce the risk of the tube failure in coal/biomass/MSW fired power plants,a high temperature heat exchanger surface ash and temperature state monitoring system based on endoscopic optical temperature measurement method was proposed.A multi-diffusion Hencken burner and fine-particle oscillating powder feeding technology were used to study the relationship between the visible light radiation characteristics and temperature of three kinds of fly ash.Results show that the radiation-temperature correlation curves of the three kinds of fly ash are distinguished due to the different physical and chemical properties.Different selection of optical channels will also significantly affect the accuracy of the results,so laboratory calibration of the system should be carried out before practical application to obtain more accurate results.