摘要
机组实际运行中,主蒸汽压力不可避免地偏离基准值而影响机组的热耗率。本研究以汽轮机变工况理论为基础,结合热力系统计算,采用MATLAB编程,以某600 MW凝汽式机组为例,计算得到了该机组在THA工况下的主蒸汽压力与热耗修正曲线。主蒸汽压力的计算区间为16.0～17.3 MPa,与汽轮机制造厂提供的热耗修正曲线对比,随着主汽压偏离设计值16.7 MPa越大,热耗率的计算值与设计值的误差就会增大,当主汽压为16.0 MPa时,误差达到最大,为0.045%,但已完全能够满足工程实际的需要。结果表明本方法具有一定的计算精度,简单实用。
During the practical operation of a steam turbine unit,the main steam pressure inevitably deviates from its reference value and affects the heat rate of the unit.Based on the off-design theory for steam turbines and in combination with the thermal system calculation,a program was designed by using the software MATLAB.With a 600 MW condensing type steam turbine unit serving as an example,the main steam pressure and heat rate correction curves for the unit were obtained through a calculation under the THA(turbine heat acceptance) operating condition.The main steam pressure ranged from 16.0 to 17.3 MPa.Compared with the heat rate correction curve provided by the steam turbine manufacturer,the error between the calculated value and the design one of the heat rate will increase with an increase of the main steam pressure deviation from the design value-16.7 MPa.When the main steam pressure is 16.0 MPa,the error attains its maximum value of 0.045%.However,this maximal error can completely meet the requirements of engineering practice.The research results show that the method in question has a certain calculation precision and is simple and practical.
出处
《热能动力工程》
CAS
CSCD
北大核心
2011年第3期351-353,376-377,共3页
Journal of Engineering for Thermal Energy and Power
关键词
主蒸汽压力
汽轮机变工况
热耗修正曲线
main steam pressure,off-design operating conditions of a steam turbine,heat rate correction curve
