steam cycle of super-critical power plant
TRANSCRIPT
STEAM CYCLE OF SUPER-CRITICAL POWER PLANT
By: Amit Kumar Singh
Ankush Gupta
Gaurav Gupta
Himanshu Saini
CONTENTS
ABOUT US RANKINE CYCLE STEAM CYCLE VARIABLE PRESSURE CONTROL
ABOUT US
The JV emerged in 1995 at Baroda, on equal equity basis.
RANKINE CYCLE OF SUB-CRITICAL POWER PLANT
RANKINE CYCLE OF SUPER-CRITICAL POWER PLANT
MAIN STEAM
From BFP Discharge
Boiler Recirculation Pump
Boiler Feed Pump Discharge Header Economizer I/L
Header
Economizer Coils
LTSH I/L HeaderBackpass Lower
Front Header
Intermediate Header
Economizer O/L Header
First Pass Lower Header
Divisional SH I/L Divisional
SH O/L
FSH I/LFSH O/L
Roof I/L Header
Waterwall O/L Header
Seperator (Nos:4)
Separator Storage Tank(Nos:1)
DSH #1
DSH #2
Spiral Tubes (232 ×2) =464
Vertical tubes(464 × 3)=(348 × 4) =1392
LTSH O/L HeaderRoof O/L Header
Boiler Flow Diagram
Backpass Roof
Backpass Left & Right SideWall
Extended water wall
First and Middle Pass Roof
Reheater
ADVANTAGES OF SUPERCRITICAL OVER SUBCRITICAL
Higher Plant Thermal efficiency Increased plant availability & reliability Greater environmental compatibility Sliding pressure operation Lower coal/Power consumption Lower cost of generation
Water wall Furnace Configuration
(With smooth tube)
SC WATER WALL TUBING
Water wall Furnace Configuration
Spiral wound tube wall Vertical tube wall
Leads to :•Less no. of smooth tubes• Complicated support of tubes•Costly - erection and manufacture
•Up to 40% pressure control range
Leads to :•Rifled tubing• Individual tube orifices•Simple tube supporting
•Up to 20% control range
INTERNALLY RIBBED TUBE
VERTICAL VARIABLE PRESSURE FURNACE
With variable pressure control less power is required.
Riffled tubes are used to achieve variable pressure in the furnace.
The tube wall can keep wet to a steam quality to 90% even with low mass flow rates.