无磨损磁密封泄灰阀的试验研究

Experimental Study of an Abrasion-free Magnetic Sealed Ash Unloading Valve

电除尘器灰斗下电动锁气器的密封所采用的端部压板和密封条容易磨损、使用寿命短,且密封性能较差。一种新型磁密封泄灰阀利用粉煤灰中含有Fe3O4等磁性介质的情况,在锁气器叶片顶部加装永磁体,以吸附粉煤灰中的磁性介质来实现密封。采用自行设计的试验装置,选取了3种不同磁通量的永磁铁和4种不同磁性物质含量的粉料分别进行密封性能试验,结果表明,磁密封卸灰阀具有良好的密封性能,无磨损,不需要频繁更换零件。

The end platen and sealing strip currently used on the seal of an electrically-operated clapper valve under the ash hopper of a static precipitator are easily worn out,have a short service life and a relatively inferior sealing performance.A novel magnetic sealed ash-unloading valve has made use of the presence of Fe3O4 and other magnetic media in pulverized-coal-fired ash to additionally install a permanent magnet on the top of the clapper blade to adsorb the magnetic media in the ash to realize a seal.The authors have employed a self designed test rig and chosen three kinds of permanent magnetic iron with different magnetic flux and four kinds of powder with a variety of content of magnetic substances to conduct respectively seal performance tests.The test results show that the magnetic sealed ash-unloading valve has a good seal performance,no abrasion and no need to frequently replace the parts.