Investigation On The Temperature Distribution In A Reactor And Design Of Measure System By Optical Fiber Sensor System

A reactor is a kind of major accessory device and plays an important role in long distance electrical power-transimitted system. However the inner temperature somewhere inside the reactor often rises unexpectively due to its structure and running environments, even results in vital destruction. So it is imporment to develop the theoretical model for calculating reactor's temperature field distribution and design appropriate temperature-measuring system for reactor's temperaure distribution.Based on the dry-type air-core reactor's structure, the temperature field distribution was analyzed with finite difference and simulated with ansys software 6.1, and the results were well consistent. Since reactor's high electromagnetic field makes normal sensors invalid to measure the inner temperature distribution, Distributed optical fiber sensor system (DOFSS) is employed. As the temperature somewhere is too high, the DOFSS can detect it promptly and give an alarm. Under this circumstance, the system will automatically shut off the power to protect the reactor.On the basis of the theories of heat transfer and finite difference, reactor's temperature field distribution was deduced. Firstly, the temperature distribution of the reactor consisting of single layer was calculated with assuming without radiation. Secondly, on the assumption of every layer' surface equivalent convection coefficient and environmental temperature' expression, temperature distributions of multi-layers' were calculated. The results are in consistence with reports.To discuss the working mechanism of DOFSS, the principle of the stokes and anti-stokes light, the back transmitting of scattering light in optical fiber, optoelectric transition in avalanche photodiode(APD), electric amplification in main magnifiers, data gathering with data collection card and its disposal with computer are introduced and studied.