大温差离心机组低负荷运行防喘振策略分析  

Analysis on Anti-surge Strategy of Centrifugal Chiller with Large Temperature Difference during Low Load Operation

作　　者：吴琦琦 唐佳丽[1] 方明[1] WU Qiqi;TANG Jia-li;FANG Ming(High Magnetic Field Laboratory,Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[1]中国科学院强磁场科学中心,合肥230031

出　　处：《低温物理学报》2022年第5期365-369,共5页Low Temperature Physical Letters

基　　金：合肥综合性国家科学中心和中国科学院青年创新促进会资助(编号:2021448)资助的课题.

摘　　要：稳态强磁场实验装置水蓄冷系统是国内外具有代表性的大流量大温差水蓄冷系统之一.系统包含两个3000m^(3)的蓄水罐,为提升蓄冷量双罐均采用了自然分层技术.由于该技术的特性,在蓄冷后期,离心式冷水机组的入口水温会偏低,这导致系统新增的12℃大温差机组在试运行阶段多发低负荷喘振故障,影响了制冷运行的稳定度.本文首先对离心式冷水机组的喘振机理进行了阐述,进而分析了在改造前针对该台冷水机组所做的防喘振优化措施;通过热气旁通改造结合相关参数的合理设置,避免机组喘振风险;通过优化DDC控制,优化机组减载能力,避免了低负荷振动及噪声.本次改造为系统的安全稳定运行提供了保障.The steady-state strong magnetic field experimental device water cold storage system is one of the representative large flow and large temperature difference water cold storage systems at home and abroad.The system includes two 3000 m^(3)water storage tanks,both of which use naturally stratified technology to increase the cold storage capacity.Due to the characteristics of this technology,in the later stage of chilled water storage,the inlet water temperature of the centrifugal chiller will be lower,which causes the new added 12 C large temperature difference chiller to have low-load surge failures during the trial operation stage,which affects the stability of the refrigeration operation.This article first describes the surge mechanism of the centrifugal chiller;then the anti-surge optimization measures for the chiller before the transformation are analyzed.Through the hot vapor bypass modification combined with the reasonable setting of related parameters,the surge risk of the unit is solved;through the optimization of DDC control,the load reduction capacity of the unit is optimized,and low-load vibration and noise are avoided.This transformation provides a guarantee for the safe and stable operation of the system.

关 键 词：离心式冷水机组 低负荷运行 喘振 热气旁通 

分 类 号：TB657[一般工业技术—制冷工程]