Temperature In Power Plant Research Articles

Autotuning PID Controller for Superheated Steam Temperature in Power Plants

An autotuning PID controller is applied to control the superheated steam temperature in a heat recovery steam generator (HRSG) of a combined cycle power plant. The autotuning PID controller has been evaluated using a HRSG non-lineal model. The result obtained in the simulation indicated that the autotuning PID controller exhibits a better performance than to the conventional PI controller well tuned. The autotuning PID controller consists of the following main modules: parameters estimation, tuning strategy, gain-scheduling control, supervision level and user interface

Continuous Observation of Cavity Growth and Coalescence by Creep-Fatigue Tests in SEM.

Structural components operating at high temperatures in power plants are subjected to interaction of thermal fatigue and creep which results in creep-fatigue damage. In evaluating the life of those components, it is important to understand microscopic damage evolution under creep-fatigue conditions. In this study, static creep and creep-fatigue tests with tensile holdtime were conducted on SUS304 stainless steel by using a high-temperature fatigue machine combined with a scanning electron microscope (SEM), and cavity growth and coalescence behaviors on surface grain boundaries were observed continuously by the SEM. Quantitative analysis of creep cavity growth based on the observation was made for comparison with theoretical growth models. As a result, it was found that grain boundary cavities nucleate at random and grow preferentially on grain boundaries in a direction almost normal to the stress axis. Under the creep condition, the cavities grow monotonously on grain boundaries while they remain the elliptical shape. On the other hand, under the creep-fatigue condition the cavities grow with an effect of local strain distribution around the grain boundary due to cyclic loading and the micro cracks of one grain-boundary length were formed by coalescence of the cavities. Also, cavity nucleation and growth rates for creep-fatigue were more rapid than those for static creep and the constrained cavity growth model coincided well with the experimental data for creep.

Effects of low [formula omitted] power plant temperatures on estuarine invertebrates : BURTON D. T., L. B. RICHARDSON, S. L. MARGREY and P. R. ABELL, 1976. J. Wat. Pollut. Control Fed., 48 (10): 2259–2272

Effects of low [formula omitted] power plant temperatures on estuarine invertebrates : BURTON D. T., L. B. RICHARDSON, S. L. MARGREY and P. R. ABELL, 1976. J. Wat. Pollut. Control Fed., 48 (10): 2259–2272

Advancing Boiler Steam Conditions

Factors preventing the advancement of steam temperature in power plant are discussed. The construction of a coal-fired pilot plant designed to superheat steam to 760 deg C (1400 deg F) is described and the results of corrosion trials analyzed. Conclusions are drawn from the experiments relating to possible advances in design.