摘要
Abstract
Fiber Bragg grating(FBG)sensor technology is a new monitoring means with high precision,anti-electromagnetic interference distributed measurement capability.However,its application in the online monitoring of the temperature field inside the circulating fluidized bed(CFB)boiler is still blank.In order to verify the applicability and reliability of this technology in CFB boiler furnace scenarios,this paper carried out experimental research on fiber grating sensing technology on a 3.3MWth circulating fluidized bed combustion test rig.The experimental research method is to arrange a self-designed temperature measuring device at the center of the top of the test bench to conduct multi-point,synchronous and continuous monitoring of the dynamic temperature changes in the vertical gradient direction in the boiler from cold start-up to stable operation,and compare and analyze the obtained data with the temperature data of thermocouples in similar areas.The results show that the temperature field in the vertical direction obtained in the furnace varies from 20℃to 600℃,and the change trend of the temperature measuring device results is consistent with the thermocouple data,confirming the reliability and accuracy of the measurement;at the same altitude,the center temperature of the furnace is always higher than the side wall temperature,which conforms to the basic law of combustion temperature field distribution.This study confirms the feasibility of applying fiber grating sensing technology to monitoring the temperature field in CFB boilers.The test data and conclusions obtained provide an important basis and reference for subsequent engineering applications in large CFB units.关键词
循环流化床锅炉/3.3 MWth试验台/光纤光栅传感技术/炉内温度场试验/工程应用Key words
circulating fluidized bed boiler/3.3 MWth test bench/fiber grating sensing technology/temperature field test in the furnace/engineering application分类
能源科技
