Super heater System:
The steam from riser comes to the separator vessels. The steam is taken to the radiant
super heater inlet header. The super heater links are 8 in numbers and are generally of the size
219.1 to 273.0. These are connected to the header by means of nozzle (forged) or by reduced
branch end tees. The selection is based on the header size and connecting nozzle size. From the
Radiant Roof inlet header, Roof tubes start and they cover for the furnace and extended pass.
As the project designs are without super heater divisional panels, the SH Radiant Roofs are in
the form of fin welded panel in this portion. The second part of the roof is saw cut fin welded
loose tubes. These tubes go to the SH Radiant Roof outlet header. There are 8 Nos. of SH By
pass pipes which connect the SH Radiant Roof inlet and outlet headers. Steam from the SH
Radiant Roof outlet header is bifurcated into two items:- (1) One portion goes to side walls & (2)
The second goes to the extended wall inlet headers. The arrangement of headers is in the shape
of English letter ‘H’ in the plan view. The steam in the extended walls flows through the vertical
walls through the bottom panels to the extended side wall outlet header placed on the centre line
of unit. The basic difference between our conventional design of 210 / 250 MW and this unit is
that the steam flow is upward in our designs where as the steam flow is downward in this
design.
The steam from extended wall outlet header then flows to the set of two extra headers used in
the specific project design. In between the two headers, there are 18 Nos. of pipes size 168.3 x 47.0
thick Alloy Steel, which take load and also complete the steam circuit. From the bottom header
steam is taken to the 2nd Pass Bottom Front wall inlet header by 2 Nos. of links. The second
part of steam flows from the 2nd pass side walls to the outlet bottom headers. From the side wall
outlet headers, the steam in correct proportion flows to Front Wall Inlet Header and Rear Wall
Inlet Header. Also, the steam cooled Hanger tubes are taken from both of these headers (as
against our 500 MW designs, where there are taken only from the front wall header). The fin
welded panels are made of Alloy Steel tubes. The Radiant Roof tubes and extended panel tubes
are of SA213 T23 material. The steam flows through the front walls, SH Screen tubes and also
through the Economiser / LTRH coil hanger tubes and Economiser outlet header support tubes
and gets connected to the Back pass front wall outlet junction header and hanger tube outlet
header respectively. Similarly, the steam in the Back pass rear walls goes through the roof tube
and also through the hanger tubes of Economiser / LTRH coils and LTRH inlet header support
tubes and finally gets connected to the Back pass front wall junction header and the hanger
outlet header respectively. The hangers tubes include:-
i) Economiser coil hanger tubes.
ii) LTRH coil hanger tube (continuation of same economiser hanger tubes)
iii) Economiser outlet header support tubes.
iv) LTRH inlet header support tubes.
From the both hanger outlet header and front wall junction header links are taken and they join
together in the pent house before carrying the steam to the Platen super heater. Platen super heater in
the sole pendent section is in furnace radiant zone. The design of the project has 24 elements. The
platen SH is made of tube 44.5 and the main material used is SA213 TP347H and SA213 T91.
The headers are Short Stub headers.
From the platen SH coils the steam goes through the Platen outlet header, which is, split type (two
headers separately positioned and connected by mechanical means), the steam is carried by two links to
the final SH section. The SH DESH is placed in these links. These links are crissis crossed .The
finishing super heater coils are put in the extended super heater pass. This arrangement is more or less
similar to the 210 / 250 MW designs. There are two vertical banks of coils. The connection between
them by criss crossing the tube above the roof, The finishing SH coils are of 44.5 tubes and mainly
SA213 TP347H material. All the terminal tubes are SA213 T91. The steam reaches the main steam
outlet header, which is split header with end outlets and goes to HP Turbine.
Platen super heater coils in erected conditions .
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LINK 1 - PLEASE CLICK HERE
LINK 2 - PLEASE CLICK HERE
The steam from riser comes to the separator vessels. The steam is taken to the radiant
super heater inlet header. The super heater links are 8 in numbers and are generally of the size
219.1 to 273.0. These are connected to the header by means of nozzle (forged) or by reduced
branch end tees. The selection is based on the header size and connecting nozzle size. From the
Radiant Roof inlet header, Roof tubes start and they cover for the furnace and extended pass.
As the project designs are without super heater divisional panels, the SH Radiant Roofs are in
the form of fin welded panel in this portion. The second part of the roof is saw cut fin welded
loose tubes. These tubes go to the SH Radiant Roof outlet header. There are 8 Nos. of SH By
pass pipes which connect the SH Radiant Roof inlet and outlet headers. Steam from the SH
Radiant Roof outlet header is bifurcated into two items:- (1) One portion goes to side walls & (2)
The second goes to the extended wall inlet headers. The arrangement of headers is in the shape
of English letter ‘H’ in the plan view. The steam in the extended walls flows through the vertical
walls through the bottom panels to the extended side wall outlet header placed on the centre line
of unit. The basic difference between our conventional design of 210 / 250 MW and this unit is
that the steam flow is upward in our designs where as the steam flow is downward in this
design.
The steam from extended wall outlet header then flows to the set of two extra headers used in
the specific project design. In between the two headers, there are 18 Nos. of pipes size 168.3 x 47.0
thick Alloy Steel, which take load and also complete the steam circuit. From the bottom header
steam is taken to the 2nd Pass Bottom Front wall inlet header by 2 Nos. of links. The second
part of steam flows from the 2nd pass side walls to the outlet bottom headers. From the side wall
outlet headers, the steam in correct proportion flows to Front Wall Inlet Header and Rear Wall
Inlet Header. Also, the steam cooled Hanger tubes are taken from both of these headers (as
against our 500 MW designs, where there are taken only from the front wall header). The fin
welded panels are made of Alloy Steel tubes. The Radiant Roof tubes and extended panel tubes
are of SA213 T23 material. The steam flows through the front walls, SH Screen tubes and also
through the Economiser / LTRH coil hanger tubes and Economiser outlet header support tubes
and gets connected to the Back pass front wall outlet junction header and hanger tube outlet
header respectively. Similarly, the steam in the Back pass rear walls goes through the roof tube
and also through the hanger tubes of Economiser / LTRH coils and LTRH inlet header support
tubes and finally gets connected to the Back pass front wall junction header and the hanger
outlet header respectively. The hangers tubes include:-
i) Economiser coil hanger tubes.
ii) LTRH coil hanger tube (continuation of same economiser hanger tubes)
iii) Economiser outlet header support tubes.
iv) LTRH inlet header support tubes.
From the both hanger outlet header and front wall junction header links are taken and they join
together in the pent house before carrying the steam to the Platen super heater. Platen super heater in
the sole pendent section is in furnace radiant zone. The design of the project has 24 elements. The
platen SH is made of tube 44.5 and the main material used is SA213 TP347H and SA213 T91.
The headers are Short Stub headers.
From the platen SH coils the steam goes through the Platen outlet header, which is, split type (two
headers separately positioned and connected by mechanical means), the steam is carried by two links to
the final SH section. The SH DESH is placed in these links. These links are crissis crossed .The
finishing super heater coils are put in the extended super heater pass. This arrangement is more or less
similar to the 210 / 250 MW designs. There are two vertical banks of coils. The connection between
them by criss crossing the tube above the roof, The finishing SH coils are of 44.5 tubes and mainly
SA213 TP347H material. All the terminal tubes are SA213 T91. The steam reaches the main steam
outlet header, which is split header with end outlets and goes to HP Turbine.
Platen super heater coils in erected conditions .
P.S If you are looking to earn few legitimate extra money from the comfort of your home then please click on the link given below
LINK 1 - PLEASE CLICK HERE
LINK 2 - PLEASE CLICK HERE
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