Analysis of ash clogging phenomenon on air preheater of Datong Power Plant No.2 under the State Power Corp has been carried out. It is considered that the efficiency of originally designed steam operated shoot blowers was influenced upon by several factors

such as non-suitable position of installing

increasing humidity of steam at the final end

as well as non-reasonabe design of nozzle and stroke concerning the steam operated shoot blowers etc. For these reasons

it is tried to install fuel gas impulse exciting wave operated shoot blowers for replacing some steam operated shoot blowers. After putting the new type shoot blowers into operation

the resistance on both air and gas sides of the air preheater has been obviously lowered

the effectiveness of shoot blowing being excellent.