What are Bi-Drum Boilers? How Do They Work?
Bi-drum boilers are used for purposes of power generation and as process steam generators. This type of boiler is used up to 100MW for generating power. Bi-drum boilers are non-reheat units which are getting wiped out due to high heat rate of the plant. These boilers are used for generating high steam pressure which is used for power generation owing to their ability to accommodate high load of fluctuation and respond to load changes with more agility compared a single drum boiler. The two drums in the bi-drum boiler are connected using a large number of convective heat transfer tubes known as bank tubes or boiler bank tubes. These tubes are about one thousand in number. The bank tubes and the drum at the bottom that contains water will have a water level that will be up to the normal working level of water in the upper drum. The water availability in the bi-drum boiler makes it very adoptable for large load changes. Flue gases enter the bank tubes which are placed towards t...