1.4 Process Flow Diagram:
1.5 AQC (Air Quenching Cooler) Boiler
The flue gas, at 500- 5500C, from the mid tap of the existing grate cooler of line-
II will enter to the boiler through two numbers of de-dusting systems (mechanical
dust separator). Exist temperature of flue gas from Boiler will be about 100 °C. The
flue gas from this boiler will be treated in the existing cooler ESP. The unit has made
a provision to re-circulate the exits gas from ESP for sinter cooling in grate cooler
through existing cooling Fans. In this load on cooler ESP will be lower side. The
balance in draft will be maintained by control dampers in AQC WHRB and ESP inlet
duct. When the boiler will be non-operational the flue gas will be treated directly
in Cooler ESP. The AQC boiler adopts a dual pressures system. This Dual pressure
system improves the utilization efficiency of waste heat. It adopts tube box type of
construction. From the top to the bottom, the arrangements of tube boxes are as
follows:- High-pressure segment high temperature final 2B super heater tube box
- High-pressure segment high temperature final 1B super heater tube box