Carbon Steel Boiler Steam Drum for Industrial Boilers and Boilers of Thermal Power Plant
Product Description
Steam drum is the most important pressure component in natural circulation boilers. It is mainly used in medium pressure and high pressure subcritical boilers in power generation.
Drum is a cylindrical pressure vessel used in water-pipe boiler for steam and water separation and steam purification, forming a water circulation loop and string pot water. Its main function is to receive the water from economizer, separate steam from water and supply water to circulation loop, and transport saturated steam to superheater. There is a certain amount of water in the drum, which has a certain of heat and material savings. When the working conditions change, the speed of vapor pressure change can be slowed down. When the water supply and load are not coordinated for a short time, it plays a buffer role. The drum is equipped with internal devices for steam-water separation, steam cleaning, pot medication and continuous sewage discharge to ensure steam quality, as shown in the figure.
Drum is the most bulky and expensive thick-wall pressure-bearing component in boiler. The drum not only withstands high internal pressure, but als produces thermal stress due to the fluctuation of wall temperature caused by the change of operating conditions. Therefore, the working conditions are bad, the effective operation condition supervision is needed.
Structure and material
The working conditions of drum are complex and the consequences of accidents are serious. It is necessary to strictly control the chemical composition, mechanical properties and welding and processing quality of material used in drums, and to pass a series of strict tests. The cylinder is composed of a cylinder body and a head.
1. Cylinder:refers to the cylinder part of the drum. Its inner diameter and length are related to the circulation mode, boiler capacity, steam parameters and the structure of inner equipment. Steam drum is usually rolled on multi-roll reel machine. The drum wall of subcritical pressure boiler is too thick to be pressed on giant press.
2. Head: Subcritical pressure boilers are usually hemispherical, high pressure and ultra high pressure boilers are ellipsoidal, medium pressure boilers are relatively flat ellipsoidal, with manholes on the head for installation and maintenance of internal devices. The head is pressed on a hydraulic press or an oil press.
working
The separated steam is drawn out from the top section of the drum and distributed for process. Further heating of the saturated steam will make superheated steam normally used to drive a steam turbine. Saturated steam is drawn off the top of the drum and re-enters the furnace in through a superheater. The steam and water mixture enters the steam drum through riser tubes, drum internals consisting of demister separate the water droplets from the steam producing dry steam. The saturated water at the bottom of the steam drum flows down through the down comer pipe, normally unheated, to headers and water drum. Its accessories include a safety valve, water-level indicator and level controller. Feed-water of boiler is also fed to the steam drum through a feed pipe extending inside the drum, along the length of the steam drum.
A steam drum is used without or in the company of a mud-drum/feed water drum which is located at a lower level. A boiler with both steam drum and mud/water drum is called a bi-drum boiler and a boiler with only a steam drum is called a mono-drum boiler. The bi-drum boiler construction is normally intended for low pressure-rating boiler while the mono-drum is mostly designed for higher pressure-rating.
On steam locomotives the steam drum is also called a steam dome.
| Product name | Boiler steam drum |
| Material | Alloy Steel |
| Dimension | As requirement |
| Function | Steam seperation device |
| Contact Person : | Panni |
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