steam cycle of super-critical power plant

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.