1/ due to the relatively high medium temperature in the flue and hot air ducts, non-metallic expansion joints made of high-temperature resistant materials are generally selected to prevent the expansion joints from being ironed. For the hot air powder delivery pipeline, due to the presence of coal powder particles in the pipeline, in addition to the above thermal compensation requirements, it should also be considered that the expansion joint has a certain anti-wear ability, in order to extend its service life, so the general use of non-metallic expansion joint less.

 

2/ expansion joint can not only effectively absorb pipeline expansion, but also effectively absorb pipeline vibration, which can be used on the interface of equipment requiring vibration isolation.

 

3/ in the calculation and selection, in addition to the working temperature requirements, it is necessary to pay attention to the superposition of the thermal displacement of the pipe system and the thermal displacement of the equipment interface, so as to serve as the basis for the selection of non-metallic expansion joints.

 

4 / if found in the running burn through expansion section, should be timely treatment, in the expansion slot width, castable cracking under the condition of serious, short timeframe, can be in the expansion joint filler ceramic fiber, and hierarchical to the ceramic fiber coated with high temperature hot plugging glue, so that on the one hand, reinforcement of ceramic fiber and expansion joint bond, on the other hand can be temporarily sealed to the cracking of the castable, to be replaced after downtime.