439 / 2018-12-27 19:18:50

Analysis and Optimization of Air-tightness of Double-Cylinder Outer Cylinder of High Pressure Unit

high pressure outer cylinder, finite element analysis, air tightness, contact stress

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According to the water leakage test of the external hydraulic pressure test of a high temperature and high pressure unit in the early stage, Ansys Workbench is used to analyze the high pressure outer cylinder based on the finite element analysis method, and the deformation and stress distribution of the water leakage part are refined and calculated. The contact stress and contact area of the middle facet. According to the analysis results, the cross-section structure of the high-pressure outer cylinder is optimized, and the bolt pre-tightening force of the local position of the cylinder is appropriately increased. After repeated calculation, the new structure can increase the contact stress of the cylinder leakage part by about 20 MPa, which enhances the cylinder. Air tightness. It has been verified in the subsequent hydraulic test and operation stage, which provides guidance for the cylinder design of the same type of unit.
The cylinder is the core part of the steam turbine. It is the static component of the steam turbine with the largest weight, complex shape and working under high temperature and high pressure. It isolates the steam from the atmosphere and forms a closed space for steam energy conversion. During operation, due to the large changes in the temperature and specific volume of the steam, the stresses experienced by the various parts of the cylinder vary greatly along the cylinder. The unit inlet steam pressure analyzed in this paper: 13.24Mpa, inlet steam temperature: 530 癈. The double-layer cylinder structure is filled with steam which is lower than the initial parameter pressure and temperature between the inner and outer cylinders, so that the pressure difference and temperature difference between the inner and outer cylinders are greatly reduced, and the thickness of each cylinder wall and flange can be Greatly reduced, thus reducing the thermal stress during start-up, shutdown and changing working conditions, which is conducive to improving the start-up and load adaptability of the unit, while taking into account the economics.