STEAM AND WATER FLOW IN BOILER

What is boiler

• As per IBR, “Boiler” means any closed vessel exceeding 22.75 litres in capacity which is used expressly for generating steam under pressure and includes any mounting or other fitting attached to such vessel, which is wholly or partly under pressure when steam is shut off:

POWER CYCLE

Major Equipments In Boiler• Boiler pressure parts(Economiser, water

walls ,superheaters, Reheaters)• Water separator, WS drain tank, BCP• APH • FANS (ID,FD,PA,seal,scanner & their ductings)• Boiler mountings• Mills, oil guns and related pipings• ESP, ASH hoppers, Soot blowers

Economiser

Eco o/l

Eco i/tFeed water

Furnace i/t mani

i/t header

Roof i/t mani

Roof i/t hdr

Roof o/l hdr

RW

Passage SW o/l

Passage SW i/l

2ndry pass i/t mani

2ndry rear wall o/l hdr

Water separator

Drain tank

BCP

1ry SH

2ndry SH3ry SH

M.S

1ry Reheater

CRH i/t

2ndry RHHRH

DESUPERHEATER SPRAYDESUPERHEATER

SPRAY

DESUPERHEATER SPRAY

FEEDWATER

WATER + STEAM

STEAM

REHEAT STEAM

Heating surfaces

Water wall (Radiant zone) 4827.1

Water wall (convective zone) 5426.34

Eco 23306

1ry SH 12434

2dry SH 5410

3ry SH 2192

1ry RH 24012

2ry RH 5750

NPL specificationsFollowing data is at 100% BMCR

Main steam flow at SH o/t 2322000 kg/h

Steam pressure at SH o/t 256.2 kg/cm²

Max press. allowed 269.2 kg/cm²

Steam temprature at SH o/t 568 °c

Steam flow at RH outlet 1886288 kg/cm²

CRH pressure at Reheater i/t 62.61 kg/cm²

Max allowable press. At RH 73.4 kg/cm²

CRH temprature at reheater i/t 349 °c

HRH pressure at reheater o/t 60.5 kg/cm²

HRH temprature at reheater o/t 596 °c

Feed water tempratrure at eco inlet 311 °c

THANK YOU