The Test of Inner-flue Tube Wall Temperature of Superheater Based on the Power Plant SIS
Superheater and reheater tube failures were mostly due to excessive temperature, the inner-flue tube wall temperature of superheater make certain of tube thermal stress, material creep status and residual lifespan of tubes. So investigation of superheater safety began with experimentation of inner-flue tube wall temperature of superheater. In order to precisely learn inner-flue tube wall temperature of superheater of 600MW supercritical boiler, new measuring points are set on the superheater tube wall inner the flue. Since the working condition of 600MW supercritical boiler is quite severe, the temperature measuring points can only be used for short-term test. The data acquisition can be carried out automatically and a data storage system is required. The testing method in this paper transmit the measuring signal to the database of the thermal power control system through the redundant channel of the system. This method only requires new measuring points (thermocouple). The test data can be loaded directly from the SIS database, which saves not only money but also the work.
Test and Correlative Formula of Boiler Superheater Inner-Flue and Outer-Flue Tube Wall Temperature
In order to monitor tube wall temperature of boiler superheater, a new method was put forward to observe inner-flue tube wall temperature by long-term measuring outer-flue tube wall temperature. The method was based on the relation between inner-flue tube wall temperature and outer-flue tube wall temperature that was build up through testing data. The testing points were settled on the inner-flue and the outer-flue of same tube. According to the experimental data, the inner-outer flue tube wall temperature relation modeling was build up and checked.
Investigations of dielectric gratings using electrodynamic models based on volume integral equations
Eigenmodes of planar and cylindrical dielectric gratings (DGs) and electromagnetic wave scattering from multiplayer DGs are investigated. The DG characteristics are calculated using numerical-analytical solution of integral equations (IEs).