Power Plant Gyan

BOILER DRAUGHT Draught refers to the pressure difference created for the flow of gases inside the boiler. Boiler unit has a requirement of the expulsion of combustion products and supply of fresh air inside furnace for continuous combustion. The flues gases or combustion products formed during combustion should be discharged at such a height. A chimney or stack is generally used for carrying these combustion products from inside of boiler to outside , i.e. draught is created by use of chimney. Draught may be c reated naturally or artificially by using some external device.  Draught can be classified as below: In natural draught the pressure difference is created naturally without using any positive displacement device. Artificial draught is created using some external assistance causing forced displacement of gases . It can be created either by using mechanical devices or steam. Artificial draught can be of induced type, forced type or combination of