Airpreheater Flue Gas Boiler Parts for Steel Making Processes

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Products Brief Introduction

A steam drum is a standard feature of a water-tube boiler. It is a reservoir of water/steam at the top end of the water tubes. The drum stores the steam generated in the water tubes and acts as a phase-separator for the steam/water mixture. The difference in densities between hot and cold water helps in the accumulation of the "hotter"-water/and saturated-steam into the steam-drum.

Types of Boiler Drum

1. Three drum/ Four drum boilers - Are the veterans of the normal day boilers, although they are still used in some industries.

2. Bi drum boiler - are used for power generation and steam generation both. For power generation they are used now seldom and are replaced by single drum boilers as the bi drum boilers are non-reheat units. So, due to the high heat rate of the plant a single drum boiler or a once through boiler is more feasible. In process steam generation the bi drum boilers are used commonly as they can adapt to the high load fluctuation and respond to load changes.

3. Single drum boiler- used mainly for the power plants for power generation. The pressure limit for single drum boilers is higher than that of the bi drum boilers as the stress concentration is reduced to a greater extent. There exists only one drum and the downcomers are welded to it. Single drum boilers are suitable and can adapt to both reheat and non-reheat type of boilers. They can be designed as Corner tube boiler where the frame is not required as the downcomers itself serves the purpose of it and also they are designed as top supported where the whole boiler assembly needs an external frame and supported by top drum.

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