EXCESS AIR SYSTEM WITH TUBULAR AIR HEATER

摘要

FIELD: power engineering, possibly development and reconstruction of boiler units. ^ SUBSTANCE: in excess air system provided with multi-way tubular air heater having air recirculating line at least with one air-water heat exchanger, air take-up to recirculating line is realized from split between ways of air heater. Recirculating line is connected through bridge having shutter with outlet of last way of air heater and with draining unit. ^ EFFECT: enhanced efficiency of excess air system provided with multi-way tubular air heaters arranged after economizer along gas motion direction. ^ 5 dwg