Inconel 625 Overlay Superheater Coil Cladding Tube Wear / Heat /
Corrosion Resistance
Cladding is a welding process in which a layer of wear-resistant,
corrosion-resistant, heat-resistant metal layer is deposited on the
surface or edge of the workpiece.
Cladding has significant economic benefits in improving the service
life of parts, rationally using materials, improving product
performance and reducing cost. Different workpiece and surfacing electrode must adopt different
surfacing technology to obtain satisfactory surfacing effect.
Cladding is mainly divided into four categories:
1, to reduce the abrasive wear, corrosion, impact or cavitation on
the surface of the welding parts and the use of the surfacing
layer, wear-resistant surfacing.
2, in order to make the surface corrosion resistance, in carbon
steel or alloy steel base material surfacing of a certain thickness
of filled metal, known as cladding surfacing.
3, when welding different materials, or have special requirements,
in order to ensure the quality and performance of the joint, to do
isolation on the base material in advance, known as isolation layer
surfacing.
4. The metal added on the surface of the weldment, the edge of the
joint or in order to restore the required size of the component is
called thickening surfacing.
Superheater Coil Description
Serpentine tube is a tube that twists and turns several times in a
plane.The convection heating surface of the boiler, such as economizer,
superheater and reheater, adopts the structure of serpentine tube
through the belt, with horizontal and vertical layout.
The superheater, reheater and economizer of the boiler adopt
serpentine tube heating surface. Due to a series of characteristics
such as large number, different bending radius and many welded
joints, the manufacturing process of serpentine heating surface is
more complex and the productivity is lower. In recent years, in
order to change this backward production appearance, China's major
boiler plants have taken a series of measures in design and
technology to improve the universality of product parts and
components, creating necessary conditions for the mechanization,
automation and organization of automatic production lines of
serpentine pipe production. At present, China's major boiler plants
have adopted automatic production lines with program control for
the manufacture of coil heating surfaces.
Function
Superheater is to increase the temperature of the steam above its saturation
point.
Reheater is basically a superheater that superheats steam exiting the
high-pressure stage of a turbine. The reheated steam is then sent
to the low-pressure stage of the turbine. By reheating steam
between high-pressure and low-pressure turbine it is possible to
increase the electrical efficiency of the power plant cycle beyond
40%.The reheat cycle is used in large power boilers since it is
feasible economically only in larger power plants.
1. Material composition: It is made up of snake-like tubes (carbon
steel, alloy steel or heat-resistant steel, etc.) and collection
boxes and other supporting material. Tubes generally have 32, 38,
42 or other types of specifications, according to user's needs
separately.
2. Arrangement: vertical or horizontal layout.
3. Features: beautiful appearance, size, accuracy, first-class
bending and welding technology, first-class detection equipment.
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.
| | | |
| 1.Firm structural support | 1. Flow blockage by condensed steam 2. Needs slow restart to purge
the water that accumulates in the bottom. | |
| 1.Proper drainage of the condensed steam | 1. Lack the structural rigidity, especially in high speed gas flow | |
| 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. |
Process
Testing Equipment
Company Introduction
Established in 1985,Zhangjiagang Hua Dong Boiler Co.,Ltd.(trading
as HD Boiler),produces power plant; industrial; waste heat; waste
incineration; biomass; organic heat carrier and electric steam
boilers. Coupled with a comprehensive range of heating surfaces, HD
Boiler brings to the market a unique service including boiler
design , fabrication, installation, maintenance and replacement of
boiler pressure parts.
1. Fabrication area of 200,000 square meters
2. 80 Engineers
3. 200 Coded welders
4. 30 Licensed Inspectors(NDT Level-III instructors)
5. Class-A Licenses for Design and Manufacture Boiler
6. ISO 9001:2008 Quality System
7. ASME Certificate of Power Boilers
8. ASME 'S','U' and NB stamp authorization
