Customized Premium Nickel Base Heat Exchange Parts Superheater And
Reheater
What is a superheater in a boiler?
A superheater heats saturated steam beyond its boiling point to
increase thermal efficiency and prevent turbine condensation.
Product Functions of Superheater and Reheater
Superheater
1.The function of the superheater in the thermal power plant is to
remove the last traces of moisture ( 1 to 2%) from the saturated
steam coming out of boiler and to increase its temperature
sufficiently above saturation temperature.
2.The super-heating heating raises overall overall cycle efficiency
efficiency as well as avoids too much condensation in the last
stages of the turbine which avoids the blade erosion.
3.The heat of combustion gases from furnace is utilized for the
removal of moisture from steam and to superheat the steam.
4.Super-heaters usually have several tube circuits in parallel with
one or more return bends, connected between headers.
Reheater
1.The function of the re-heaters is to resuperheat the partly
expanded steam from the turbine.
This is done so that the steam remains dry as far as possible
through the last stage of the turbine.
2.Location: Before or after the convective superheater in the
convective zone of utility boilers. In modern high pressure
boilers, reheaters are generally in two sections.
3.The primary section is placed in the convective zone and
secondary section is placed just at the furnace exit hanging from
the top.
4.The design consideration for reheaters are similar to those for
superheaters.
5.It having same output temperatures but steam pressures are about
20-25% of those in superheaters. Hence lower grade steel alloy can
be used for reheaters.
Details of Superheater and Reheater
| 1 | Material composition | Carbon steel, alloy steel or heat-resistant steel, collection boxes
and other supporting material. Tubes are customized types of
specifications. |
| 2 | Design pattern | Vertical or horizontal layout. |
| 3 | Advantages | Beautiful appearance, size, accuracy, first-class bending and
welding technology, first-class detection equipment. |
Type Advantages Disadvantages Supporting method
Pendant-type
1.Firm structural support
2. Flow blockage by condensed steam
3. Needs slow restart to purge the water that accumulates in the
bottom. supported from above
Inverted-type
1.Proper drainage of the condensed steam
2. Lack the structural rigidity, especially in high speed gas flow
Supported from below
Horizontal -type
1. Proper drainage
2. Good structural rigidity.
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.
Manufacturing and acceptance criteria of Superheater and Reheater
1.JB/T1611 " Technical specification for manufacturing of boiler
pipes."
2.JB/T1612 "boiler pressure test technical conditions. "
3.JB/T1613 "Technical specification for welding of pressure parts
of boiler."
4.JB/T1615"Technical specification for painting and packing of
boiler."
5. JB/T3375 "Rules for receiving acceptance of materials for boiler
construction."
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