A new method for optimum heating of pressure components in supercritical steam power blocks

Archives of Thermodynamics

Piotr DudaCorresponding authorCracow University of Technology, Faculty of Mechanical Engineering, al. Jana Paw?a II 37, 31-864 Kraków, PolandEmailOther articles by this author:De Gruyter OnlineGoogle Scholar¹  Dariusz Rz?saCracow University of Technology, Faculty of Mechanical Engineering, al. Jana Paw?a II 37, 31-864 Kraków, PolandOther articles by this author:De Gruyter OnlineGoogle Scholar¹ 

[1] Cracow University of Technology, Faculty of Mechanical Engineering, al. Jana Paw?a II 37, 31-864 Kraków, Poland

关键词: Keywords: Optimization methods;    Total stresses;    Steam boilers;    Heat transfer;   

DOI  :  10.2478/v10173-012-0024-x

学科分类：能源（综合）

来源: Polska Akademia Nauk * Oddzial w Gdansku, Instytut Maszyn Przeplywowych / Polish Academy of Sciences, Institute of Fluid-Flow Machinery

【 摘 要 】

One of the major concerns of the power energy industries is a proper operation of steam power blocks. Pressurized working medium and high temperature cause very high stresses in the construction elements such as collectors, separators or steam valves. They are exposed to sudden temperature and pressure changes that cause high stresses at certain points. Additionally, the cyclic character of loading causes material fatigue, known as low-cyclic fatigue, which may lead to the formation of fracture. Thus, methodologies offered by many companies should ensure reliable and safe operation of steam power blocks. The advanced numerical solutions for determining time-optimum medium temperature changes are presented. They are based on Levenberg-Marquardt and nonlinear programming by quadratic Lagrangian methods. The methods allow us to find parameters for start-up and shut-down operation that can reduce total stresses to limits governed by European regulations. Furthermore, the heating and cooling operations are conducted in a shortest time possible.

【 授权许可】

Unknown