boiler drum
ZBG is a boiler manufacturer. In addition to producing and selling various industrial boilers and power station boilers, it also sells various boiler components and auxiliary machines such as drums, membrane walls, threaded pipes, economizers, air preheater and Superheater. The boiler drum is a cylindrical pressure vessel used in a water tube boiler for steam-water separation and steam purification, which constitutes a water circulation loop and stores pot water, and is also called a steam drum. The drum 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.
Boiler drum working principle
Supplied water fed by the pump to the drum inlet is preheated through the economizer, in order to reduce energy consumption. Due to the gravity, water flows down through a downcomer-riser closed loop producing saturated steam, which flows along the riser tubes before being collected and fed back into the drum. The saturated steam flows through the water level utility exits upon reaching the drum outlet. Then it is reheated one more time at the superheater.
The function of boiler drum
The drum (also known as steam drum) is the most important pressure component in the natural circulation boiler. The main functions of the drum are:
1. It is the connection hub of the three processes of heating, evaporation and overheating of the working fluid to ensure the normal water circulation of the boiler.
2. There are steam-water separation devices and continuous sewage devices inside to ensure the boiler steam quality.
3. There is a certain amount of water, and it has a certain heat storage capacity to moderate the change speed of steam pressure.
4. There are pressure gauges, water level gauges, accidental water discharge, safety valves and other equipment on the drum to ensure the safe operation of the boiler.
Types of boiler drums
Single drum boiler has 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.
Double drum boiler are used for power generation and steam generation both. 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. SZL series double drum boiler is horizontal type large capacity water tube boiler with high steam quality. The boiler is consisted of upper part (boiler heating part) and lower part (combustion equipment). This series boiler has reached the international advanced level on technology and performance, has the advantages of compact structure, convenient installation, short install period, low cost, and environmental protect.
Three drum/ Four drum boilers are the veterans of the normal day boilers, although they are still used in some industries.
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