摘要
Abstract
Whether the axial thrust of steam turbine rotor is balanced has a critical impact on the operation safety of steam turbine unit,and a reasonable rotor axial thrust balance method is the key to the success of turbine design.The generation of turbine rotor axial thrust is introduced,the traditional rotor axial thrust balance methods are listed,the limitations of traditional turbine rotor axial thrust balance methods are analyzed.A common cogeneration steam turbine-adjustable extraction unit is introduced.Due to the pure condensing condition and adjustable extraction condition,the axial thrust range of the turbine rotor is very large.In the traditional rotor axial thrust balance method,configuring large-size front and rear thrust bearings,will increase the manufacturing cost of the turbine and the user's construction cost,and the power consumption of turbine bearing will increase during operation,resulting in the decrease of turbine's output.Then a new turbine rotor axial thrust balance method is explored through data analysis and comparison.In the method,the steam in the balance piston section of the front steam seal is connected to the electric control valve,and the pressure regulation logic control is set in the electric control valve,the pressure of the balance piston section is controlled by logic,which can effectively reduce the axial thrust of the turbine rotor.The actual operation of the turbine verifies that the temperature of the thrust bearing is within 75℃,and the axial displacement is normal.This method achieves the purpose of reducing investment cost and improving operation efficiency.关键词
汽轮机/轴向推力/传统方法/局限性/新方法/优化Key words
steam turbine/axial thrust/traditional method/limitation/new method/optimization分类
信息技术与安全科学
