Analysis of Reconstruction and Reinforcement Design for a Thermal Power Plant Boiler Frame

Abstract

It’s imperative for thermal power plant to add denitrification system. Denitrification facility is usually arranged between economizer and air pre-heater, which may unavoidably collide with vertical bracings of boiler frame. Based on the denitrification project of a power plant in north China, this paper puts forward a simplified analysis method and a practical reinforcement scheme for boiler frame which needs to remove some bracings. The method is on the basis of effects of vertical bracings on boiler frame. Three models including original structure, demolished one and reinforced one are conducted to study structural behaviour under horizontal loads in SAP2000 software. Considering that bracings between the columns bear horizontal loads mainly and increase the horizontal stiffness of frame, reinforcement design is based on the principle of equal rigidity that the horizontal floor displacement and the proportion of horizontal loads boiler columns bear are approximately same as original.