Superheater
Fossil fuel power plants often have a superheater section in the steam generating furnace.The steam passes through drying equipment inside the steam drum on to the superheater, a set of tubes in the furnace. Here the steam picks up more energy from hot flue gases outside the tubing, and its temperature is now superheated above the saturation temperature.
Reheater
Power plant furnaces may have a reheater section containing tubes heated by hot flue gases outside the tubes. Exhaust steam from the high-pressure turbine is passed through these heated tubes to collect more energy before driving the intermediate and then low-pressure turbines.
According to the installation mode in the boiler, the serpentine tube panel can be generally divided into two types: vertical suspension type and horizontal suspension type. The vertical suspended serpentine tube panel is generally a single-layer structure, which is mainly used in the high-temperature section of the superheater and reheater. The end of the tube panel is directly connected with the pipe joint of the header, suspended and arranged in the longitudinal direction of the header, and penetrated the ceiling of the furnace chamber, and sealed with it through the accessories on the tube panel; The horizontal suspended serpentine tube panel, most of which are of double-layer structure, is fixed and suspended by water-cooled hanging tube in the middle, and is generally used in the low temperature section of superheater and reheater and the serpentine tube of economizer.
There are different types of super heaters with advantages and disadvantages as below:
Differences
| Type | Advantages | Disadvantages | Supporting method |
| Pendant-type | 1.Firm structural support | 1. Flow blockage by condensed steam 2. Needs slow restart to purge the water that accumulates in the bottom. | supported from above |
| Inverted-type | 1.Proper drainage of the condensed steam | 1. Lack the structural rigidity, especially in high speed gas flow | Supported from below |
| Horizontal -type | 1. Proper drainage 2. Good structural rigidity. | 1. They do not view the flam directly so they are mainly from the convective type | Usually supported in the vertical gas ducts parallel to the main furnace. |
For over 30 years, Hua Dong Boiler has been consistently innovating and improving our boiler superheaters and reheaters. The improvements in bending, welding and design ensure our products meet both European and American standards, ensuring a reliable performance.
The materials and tube diameter range of our super heater and reheater are indicated as below:
Materials for superheater & reheater we can fabricate
Carbon steel
stainless steel
nickel and special alloys
Tube diameter range of our superheater & reheater
32-42mm
