TILTING TYPE OF STEAM COIL AIR PREHEATER FOR BOILER

摘要

The present invention relates to an aerodynamically improved tiltable steam-coil-air-preheat (SCAPF-1) for preventing corrosion in the cold end elements of a boiler system. The boiler system having a main preheat (010 having at least one cold element (02), a power actuator (10), a plurality of forced draft fans and primary fans forcing air flow to a bus duct (06) from which an auxiliary duct configured to approach the main preheat (01). The steam coil air pre heater comprises an inlet duct (05) for providing air flow from the bus duct (06) into the SCAPH, a first flexible hose (08) for providing steam inflow via a plurality of finned tubes disposed inside the SCAPH, the plurality of finned tubes acting as a heat-transfer means. A second flexible hose (07) for providing steam outflow from the SCAPH via a drain (12), at least one seal (09) for preventing the air to bypass the SCAPH thereby ensuring transfer of heat from the steam to air, an outlet duct (03) for exiting the air flow from the SCAPH. The SCAPH is hinged connected to the power actuator (100) such that the SCAPH is tiltable shifted in a first upward position being away from the air flow path when bolter load exceeding 30%. The power actuator (10) during the operation phase of the tillable SCAPH lowering the SCAPH down to be in a second position such that Its heat transfer surface gets disposed to the air-flow, and the inlet and the outlet ducting (03, 05) are configured to have a taper angle in the range of 70 ± 10 to achieve an aerodynamically improved flow of air.