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当管网容量和阻力较大 ,使管网压力大于风机出口压力 ,气体回冲入风机 ,风机叶栅内出现强烈的突变性旋转失速 ,这种风机管网系统的周期性振荡 ,即形成风机喘振。一般可通过加装分流器、加装旁通管或关小动叶、降低转速等措施防止喘振。文章通过建立多变量数学模型 ,采用多变量控制风机热力能量头的方式来防止风机的喘振。结合湘潭电厂生产实际中出现的风机喘振问题 ,将多变量控制风机热力质量能的措施运用于INFI- 90分散控制系统中 ,解决风机喘振问题
When the pipe network capacity and resistance is larger, so that the pipe network pressure is greater than the outlet pressure of the fan, the gas back into the fan, the fan cascade strong sudden rotation stall occurs, this fan pipe network system of periodic oscillations, the formation of fan Surge. Generally through the installation of shunt, install bypass pipe or off small leaflet, reduce speed and other measures to prevent surge. By establishing a multivariable mathematical model and using multivariable control of the fan’s thermal energy head, the article prevents fan surge. Combining with the fan surge problem occurred in the actual production of Xiangtan Power Plant, the measures of controlling multivariable thermal mass energy of fan are applied to INFI-90 distributed control system to solve the problem of fan surge