THERMAL POWER PROJECT PR. PARTS RE-HEATER ,SEPERATOR ETC

                                                                  Re heater System:

The re-heater system of Once Through Super Critical designs consists of generally two stages of

reheating sections. One is positioned in the 2nd Pass of the two pass designs. Generally, in Sub-

critical designs, we have horizontal banks of low temperature super heaters in the second pass above

economisers. The low temperature re heaters are placed in 4 banks in the designs of this project. The

LTRH coil inlet header is positioned inside the flue gas path and is supported by separate set of hanger

tubes, which are taken from the rear wall inlet header for this purpose.  The headers (inlet & outlet) are

with short stubs. The coils are made in four banks and are hanger tube supported designs.

The RH steam is carried over to the second stage of re heater by means of two links which are end

connected and are criss-crossed before it reaches the inlet header of RH pendent section.

The Pendent section is positioned on the water wall arch tube zone. These are platen sections .The

coils are with 76.2 tube as wrapper and 63.5 as inner tube. The material of coils is SA213TP347H and

SA213 Super 304H. This is a new material for our use.The hot reheat steam from the pendent outlet

section goes to the finishing RH outlet header. The finishing RH outlet header is split header and is

made of SA335 P91 material. The header has end connections.

The hot reheat steam from the pendent outlet section goes to the finishing RH outlet header. The

finishing RH outlet header is split header and is made of SA335 P91 material. The header has end

connections.


Start up System:

The following are the critical components of start up system for which detailing is to be done afterwards.

a) Separator Vessel.

b) Collector Vessel or Storage Tank.

I. Separator Vessel:

 The separator vessel as the name suggested is instrumental in steam water separation on during the low

load operation. The steam water mixture at low load enters the vessels through the nozzles arranged

axially around vessel. The nozzles are arranged at an angle of 5° from the horizontal plane. This is to

facilitate to create swirl and centrifugal force to create better separation during the start up and low

load operations.

II. Collector Vessel:

The collector vessel as the name suggested is reservoir for the start up system. In this vessel, the water

enters through the nozzles arranged axially around vessel. The nozzles are arranged horizontally.

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