FIELD: power engineering.
SUBSTANCE: invention relates to power engineering and can be used in electric power station boilers at air feed to burners. Proposed device comprises air duct arranged in flue channel. Air guide sleeve is fitted at air duct initial end, at least, partially there inside. Note here that said sleeve is made of low heat conductivity material and serves to decrease turbulence in airflow. It has inlet end and second end located inside said air duct Second end is shaped to decrease turbulence in airflow. Aforesaid sleeve is provided with slits or recesses that expand towards its second end.
EFFECT: lower heat transfer factor, ruled out pipeline overcooling.
11 cl, 5 dwg
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