Research On Development And Application Of Remote Sensing Technology For Obstacle Detecting With Furnace Tube Untouched

Furnace tube bundle is an important equipment for coking.Because of its complex structure,closely-spaced tubes and its furnace wall for heat preservation,its obstacles can not be detected or determined with conventional non-destructive detecting equipment and methods.Even by taking apart the furnace wall and insulating layer,it's still not able to check these over closely-spaced and too many heat exchange tubes.As a result,it has to be reactive to maintain the equipment after the accident that furnace tube bursts or high temperature steam pipeline leaks.Therefore,it is an urgent problem to develop non-destructive detection techniques for active furnace tube bundles,so as to detect flaws inside tube bundles accurately and take maintainence measures timely.In the thesis,we track and analyze the accidents of furnace tube bursting in these years.And based on the results,technique of Magnetostrictive guided wave is adopted with also conventional ultrasound detection to detect phenomenon of thinning,MsS are researched and experiments are carried out on scraped economizer channels and tube bundle replacement parts,with also conventional ultrasound detection.Experiments are carried out on scraped economizer channels and tube bundle replacement parts,with also conventional ultrasound detection.The staged achievement was applied to the project of maintaining equipment in the iron-making plant.We checked the 10#,7#and 5#CDQ furnace evaporator tube bundles in iron mill by field test,and found some of them with abnormal echo.By sampling and dissection,the results of tube wall corrosion thinning are consistent with the determination of our research.Results of the research are as follows:1.Conventional non-destructive detection techniques,such as radial detection,ultrasound detection,magnetic powder detection and permeation detection,are not suitable for detecting CDQ furnace evaporator tube bundles.2.Simulation study on sample tube carried out in laboratory shows that,by grouting segments of the tubes with cement,increasing and decreasing temperature,observing local temperature changing during the procedure,gathering infrared images,analyzing differences among different locations,existence of flaws inside tube bundles can be determined.3.Guided wave detection technique is suitable for CDQ furnace evaporator tube layout.It can discriminate pitting,thinning,and erosive wear flaws in small-bore tube bundles.4.By designing the procedure of adhering iron-cobalt strip,the problem of guide wave data collection is solved,and so as the efficiency and reliability of detection.