High air leakage and low operation reliability are common problems occurred in rotary air preheaters
and a good seal type plays an important role in reducing the air leakage.Thus
different seal types of rotary air preheaters are described in detail.The actual application shows the multi-sealing technology is the most widely-used one
with adjustable sealing system
it will achieve a low air leakage rate.The flexible sealing technology can also keep the air leakage rate at a low level if were examined and replaced timely.The gap self-compensated seal technology
guiding seal technology and pressurized seal technology are applied fewer at present
their reliability and application prospects still need observation.