DEVICE FOR PROTECTION OF HEAT EXCHANGERS AGAINST ABRASIVE ASH WEAR Russian patent published in 2020 - IPC F28G13/00 F28F19/00 

FIELD: heat exchange.

SUBSTANCE: device for protection of heat exchangers, for example, air heaters of power boilers, from abrasive gold wear contains for each pipe nozzle with internal channel installed coaxially to pipe of heat exchanger, which serves for passage of heat carrier with abrasive particles. Nozzle consists of inlet, main and connecting sections, between the main and connection sections of nozzle a ledge is made, wherein diameter of channel on connecting section is more than diameter of channel in inlet and main sections. In wall of nozzle there are side channels, axes of which are directed at angle to nozzle axis and which extend into inner channel of nozzle behind the ledge.

EFFECT: technical result is reduction of erosion of nozzle itself and adjacent pipes, and additional seal, made, for example, by surface hardening, cementing or laser spraying on inner surface of nozzle channel, increases its impact strength, thereby providing a stream of hot gases with abrasive particles coaxially stabilized after the nozzle, which flows in without impact on the walls of the pipes and on the tube plate, and as a result, their service life increases.

6 cl, 2 dwg