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.
Characterization and growth modeling of ash deposits in coal fired boilers
Abstract An ash deposit growing model based on surface growing theory is developed in order to represent the coal fired ash deposits. The predicted characteristics are compared to physical and chemical measurements of a typical ash deposit collected from an existing coal fired power plant located in the south of Brazil. Several structures were generated and compared to scanning electron images of ash deposits collected from the steam superheater section. The physical and chemical characteristics of the ash deposits, such as porosity, pore size distribution and fractal dimension of a typical ash deposit were measured using SEM image. All the images were analyzed using Imago software. Also, the existing ceramic phases were quantified using EDX detection and X-ray diffraction. The proposed random trajectory particle deposition model led to good agreement when compared to the macro quantities such as porosity and fractal dimension. It is expected that the modeled porous structure can be used for further heat transfer analysis and evaluation of coal-fired steam boiler designs.
Complex telemonitoring of patients and elderly people for telemedical and homecare services
The paper presents a project that has as main goal researches, design and implementation of an electronic-informatics-telecom and scalable system, that allows the automatic and complex telemonitoring, everywhere and every time (at home, in hospitals, at work, of mobile subject etc, using several communication paths), in real time, of persons with chronic illnesses, of elderly people, of those having high medical risk and of those with neurolocomotor disabilities.