Rapid Rise Of Heat Input Effects On The Tubes Characteristics In Boiler Of Steam Power Plant

Abstract

This work provides a theoretical and an experimental investigation of the dynamic effects of rapid rise in fuel flow rate (heat input) on the characteristics of the riser tubes in natural circulation water tube in boiler of steam power plant. In the theoretical work, the heat transfer coefficient and wall temperature are calculated and the governing equations of mathematical boiler model are solved .The experimental work was applied on the power plant of Didacta – Italia which available in Damascus University. Upper drum parameters are measured under increasing of heat input by ratio 10% and 20%.The results indicated that rapid increase in the fuel flow rate causes increased rates of evaporation and thus causes high increase in the quality that causes tube overheating. The riser temperature increases slightly above the saturation temperature due to the increase in the steam temperature and due to the dynamic influence resulting from sudden increase in the heat flux. The theoretical and experimental results provided good an acceptable comparison and the same behavior with Kim and Choi results and represented by graphic.