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STANDARD TECHNICAL FEATURES

OF

BTG SYSTEM FOR SUPERCRITICAL

660/ 800 MW THERMAL UNITS

Government of India

Ministry of Power

Central Electricity Authority

New Delhi – 110066

JULY, 2013

STANDARD TECHNICAL FEATURES

OF

BTG SYSTEM FOR SUPERCRITICAL 660/ 800 MW THERMAL UNITS

Government of India

Ministry of Power

Central Electricity Authority

New Delhi

JULY, 2013

Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Units

STANDARD TECHNICAL FEATURES OF BTG SYSTEM FOR SUPERCRITICAL 660/800 MW THERMAL UNITS

CONTENTS

Chapter/

Description

Page No.

Clause No.

 

 

 

 

 

 

 

 

Section-1: General

 

 

 

 

 

1.

Introduction

1

 

 

 

 

 

1.1

Supercritical technology

1

 

 

 

 

 

1.2

Implications on design/ construction

2

 

 

 

 

2.

Operating Capability of Plant

6

 

 

 

3.

General Technical Requirements

7

 

 

 

4.

Layout Considerations

9

 

 

 

5.

Performance Guarantees

12

 

 

 

 

5.1

General requirements

12

 

 

 

 

 

5.2

Guarantees under Category-I

13

 

 

 

 

 

5.3

Guarantees under Category-II

14

 

 

 

 

 

5.4

Guarantees under Category-III

14

 

 

 

 

 

5.5

Test codes, test conditions etc.

20

 

 

 

 

 

 

Section 2: Steam Generator & Auxiliaries

 

 

 

 

6.

Steam Generator

24

 

 

 

 

6.1

Type

24

 

 

 

 

 

6.2

Rating of steam generator

24

 

 

 

 

 

6.3

Fuels

25

 

 

 

 

 

6.4

Salient design features and capabilities

25

 

 

 

 

 

6.5

Specifications of equipment and systems

29

 

 

 

 

7.

Draft Fans, Duct Work and Dampers

53

 

 

 

 

7.1

Forced draft and induced draft fans

53

 

 

 

 

 

7.2

Duct work

57

 

 

 

 

 

 

i

 

Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Units

 

7.3

Dampers

60

 

 

 

 

8.

Coal Preparation and Firing System

62

 

 

 

 

8.1

General

62

 

 

 

 

 

8.2

Bunker shut off gates, RC feeder inlet & outlet gates

62

 

 

 

 

 

8.3

Coal chutes

62

 

 

 

 

 

8.4

Raw coal feeders

63

 

 

 

 

 

8.5

Coal pulverizers

64

 

 

 

 

 

8.6

Pulverised coal pipes

68

 

 

 

 

 

8.7

Coal burners

69

 

 

 

 

 

8.8

Primary air fans

71

 

 

 

 

9.

Fuel Oil Firing System

73

 

 

 

 

9.1

General

73

 

 

 

 

 

9.2

Fuel oil preparation and firing system

74

 

 

 

 

10.

Electrostatic Precipitator

79

 

 

 

 

10.1

Design data

79

 

 

 

 

 

10.2

System description

81

 

 

 

 

 

10.3

Service conditions

81

 

 

 

 

 

10.4

Location and layout requirements

81

 

 

 

 

 

10.5

Maintenance requirements

82

 

 

 

 

 

10.6

Model study

82

 

 

 

 

 

10.7

Gas distribution system

82

 

 

 

 

 

10.8

Collecting plates (electrodes)

83

 

 

 

 

 

10.9

Discharge electrodes

83

 

 

 

 

 

10.10

Rapping system

83

 

 

 

 

 

10.11

Dust hoppers

84

 

 

 

 

 

10.12

Casing

85

 

 

 

 

 

10.13

Penthouse covering

86

 

 

 

 

 

10.14

Thermal insulation

86

 

 

 

 

11.

VOID

 

 

 

 

 

ii

Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Units

Section 3: Steam Turbine Generator & Auxiliaries

12.

Steam Turbine

87

 

 

 

 

 

12.1

General

87

 

 

 

 

 

12.2

Turbine casing

90

 

 

 

 

 

12.3

Turbine rotor

91

 

 

 

 

 

12.4

Nozzles and blades

91

 

 

 

 

 

12.5

Bearings

92

 

 

 

 

 

12.6

Turning gear

92

 

 

 

 

 

12.7

Gland sealing system (steam turbine and TD-BFP

92

 

 

drive)

 

 

 

 

 

 

12.8

Steam admission valves (emergency stop, reheat stop,

93

 

 

interceptor stop valves and control valves)

 

 

 

 

 

 

12.9

Nonreturn valves (NRVs)

93

 

 

 

 

 

12.10

Insulation (steam turbine and BFP drive turbine)

94

 

 

 

 

 

12.11

Turbine governing system

94

 

 

 

 

 

12.12

Turbine protective devices

95

 

 

 

 

 

12.13

Unloading devices

95

 

 

 

 

 

12.14

Turbine lubricating oil system

96

 

 

 

 

 

12.15

Turbine lubricating oil purification system

96

 

 

 

 

 

12.16

Turbine control fluid system

97

 

 

 

 

 

12.17

Central turbine lubricating oil storage oil and

97

 

 

purification system

 

 

 

 

 

13.

Steam Condensing Plant

98

 

 

 

 

13.1

General requirement

98

 

 

 

 

 

13.2

Condenser

99

 

 

 

 

 

13.3

Condenser air evacuation pumps

102

 

 

 

 

 

13.4

Condenser on load tube cleaning system

103

 

 

 

 

 

13.5

Condensate extraction pumps (CEP)

103

 

 

 

 

 

13.6

Strainers at suction of condensate extraction pumps

105

 

 

 

 

 

13.7

Drip pumps (if applicable)

106

 

 

 

 

 

13.8

Debris filters (as applicable for sea water based system)

106

 

 

 

 

 

 

iii

 

Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Units

14.

Feed Water Heating Plant and Flash Tanks

 

107

 

 

 

 

 

 

 

14.1

General requirements

 

107

 

 

 

 

 

 

 

14.2

Low pressure heaters and drain cooler

 

108

 

 

 

 

 

 

 

14.3

Deaerator

 

109

 

 

 

 

 

 

 

14.4

High pressure heaters

 

110

 

 

 

 

 

 

 

14.5

Flash tanks

 

111

 

 

 

 

 

 

15.

Boiler Feed Pumps

 

113

 

 

 

 

 

 

15.1

Number and type

 

113

 

 

 

 

 

 

 

15.2

Pump sizing

 

113

 

 

 

 

 

 

 

15.3

Design requirements

 

114

 

 

 

 

 

 

 

15.4

Operational and maintenance requirements

 

116

 

 

 

 

 

 

 

15.5

Mechanical seals

 

117

 

 

 

 

 

 

 

15.6

Hydraulic coupling and gear boxes

 

117

 

 

 

 

 

 

 

15.7

Drive turbine

 

118

 

 

 

 

 

 

16.

Generator and Auxiliary Systems

 

122

 

 

 

 

 

 

16.1

Generator

 

122

 

 

 

 

 

 

 

16.2

Generator auxiliary systems

 

129

 

 

 

 

 

 

 

 

Section 4: Control & Instrumentation System

 

 

 

 

 

17.

Control & Instrumentation System

 

135

 

 

 

 

 

 

17.1

General

 

135

 

 

 

 

 

 

 

17.2

Distributed digital control, monitoring and information

 

137

 

 

system (DDCMIS)

 

 

 

 

 

 

 

 

 

17.3

SG & TG related other control & instrumentation

 

161

 

 

systems/ equipments

 

 

 

 

 

 

 

 

 

17.4

Plant performance, analysis, diagnosis & optimization

 

168

 

 

(PADO) software

 

 

 

 

 

 

 

 

 

17.5

PLC based miscellaneous control systems

 

169

 

 

 

 

 

 

 

Section 5: Miscellaneous Systems, Piping, Valves, Insulation etc.

 

 

 

 

 

18.

Power Cycle Piping, Valves and Thermal Insulation

 

171

 

 

 

 

 

18.1

Power cycle piping

 

 

171

 

 

 

 

 

 

18.2

Control valves

 

 

180

 

 

 

 

 

 

 

iv

 

 

Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Units

 

18.3

Thermal insulation

181

 

 

 

 

 

18.4

Refractories

184

 

 

 

 

19.

Steam Turbine HP-LP Bypass System

185

 

 

 

 

19.1

Purpose

185

 

 

 

 

 

19.2

General requirements

185

 

 

 

 

20.

Auxiliary Steam Pressure Reducing & Desuperheating

187

 

 

System

 

 

 

 

21.

Equipment Cooling Water (ECW) System

189

 

 

 

 

21.1

General

189

 

 

 

 

 

21.2

System requirements

189

 

 

 

 

 

21.3

Design requirements

190

 

 

 

 

 

21.4

Sizing criteria

193

 

 

 

 

22.

Condensate Polishing Plant

194

 

 

 

 

22.1

General

194

 

 

 

 

 

22.2

Salient design data

194

 

 

 

 

 

22.3

System requirements for CPU

195

 

 

 

 

 

22.4

System requirements for external regeneration facility

197

 

 

 

 

 

22.5

Control and operation of condensate polishing plant

199

 

 

 

 

23.

Chemical Dosing System

201

 

 

 

 

23.1

General

201

 

 

 

 

 

23.2

Oxygen dosing system

201

 

 

 

 

 

23.3

All volatile treatment (AVT) system

202

 

 

 

 

24.

EOT Crane

203

 

 

 

Annexure- 1 :

CEA letter dated 24th August, 2009 constituting the

205: 207

 

 

Committee

 

 

 

 

 

v

Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Units

SECTION -1

GENERAL

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