primary fan meaning in English

主风机
主扇

In brief , based on argument above , the paper selects dual inlet dual outlet ball pulverizer , recommends dual inlet dual outlet pulverizer with plus pressure primary fan and direct air supply
通过方案论证，本论文选用双进双出钢球磨，推荐采用双进双出钢球磨直吹式燃烧制粉系统。
( 1 ) in view of the selected coal contents , the paper determines pulverizer styles , and then shows two potential coal powder plans : dual inlet dual outlet pulverizer with plus pressure primary fan and direct air supply , middle speed pulverizer with plus pressure primary fan and direct air supply
( 1 )通过煤质成分析确定出磨煤机的选型，在此基础上得出两种制粉系统拟定方案：双进双出钢球磨煤机正压冷一次风机直吹式制粉系统和中速磨煤机正压冷一次风机直吹式制粉系统。
Since the air leakage rate of the air preheaters in waigaoqiao 900 mw units is too high , and the opening of the primary fan stationary blades can not meet the requirement of the unit loads , a retrofit was carried out for the air preheater sealing system in according to the scheme proposed by alstom germany
摘要针对外高桥900mw机组空气预热器漏风率偏高、一次风机静叶开度不能满足机组负荷要求这一影响机组运行的安全性和经济性的问题，依据alstom德国公司提出的改进方案，对该空预器密封系统进行了改造。