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 |
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Clause No. |
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Section-1: General |
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1. |
Introduction |
1 |
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1.1 |
Supercritical technology |
1 |
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1.2 |
Implications on design/ construction |
2 |
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2. |
Operating Capability of Plant |
6 |
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3. |
General Technical Requirements |
7 |
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4. |
Layout Considerations |
9 |
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5. |
Performance Guarantees |
12 |
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5.1 |
General requirements |
12 |
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5.2 |
Guarantees under Category-I |
13 |
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5.3 |
Guarantees under Category-II |
14 |
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5.4 |
Guarantees under Category-III |
14 |
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5.5 |
Test codes, test conditions etc. |
20 |
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Section 2: Steam Generator & Auxiliaries |
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6. |
Steam Generator |
24 |
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6.1 |
Type |
24 |
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6.2 |
Rating of steam generator |
24 |
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6.3 |
Fuels |
25 |
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6.4 |
Salient design features and capabilities |
25 |
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6.5 |
Specifications of equipment and systems |
29 |
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7. |
Draft Fans, Duct Work and Dampers |
53 |
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7.1 |
Forced draft and induced draft fans |
53 |
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7.2 |
Duct work |
57 |
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Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Units
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7.3 |
Dampers |
60 |
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8. |
Coal Preparation and Firing System |
62 |
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8.1 |
General |
62 |
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8.2 |
Bunker shut off gates, RC feeder inlet & outlet gates |
62 |
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8.3 |
Coal chutes |
62 |
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8.4 |
Raw coal feeders |
63 |
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8.5 |
Coal pulverizers |
64 |
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8.6 |
Pulverised coal pipes |
68 |
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8.7 |
Coal burners |
69 |
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8.8 |
Primary air fans |
71 |
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9. |
Fuel Oil Firing System |
73 |
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9.1 |
General |
73 |
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9.2 |
Fuel oil preparation and firing system |
74 |
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10. |
Electrostatic Precipitator |
79 |
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10.1 |
Design data |
79 |
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10.2 |
System description |
81 |
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10.3 |
Service conditions |
81 |
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10.4 |
Location and layout requirements |
81 |
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10.5 |
Maintenance requirements |
82 |
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10.6 |
Model study |
82 |
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10.7 |
Gas distribution system |
82 |
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10.8 |
Collecting plates (electrodes) |
83 |
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10.9 |
Discharge electrodes |
83 |
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10.10 |
Rapping system |
83 |
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10.11 |
Dust hoppers |
84 |
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10.12 |
Casing |
85 |
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10.13 |
Penthouse covering |
86 |
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10.14 |
Thermal insulation |
86 |
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11. |
VOID |
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ii
Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Units
Section 3: Steam Turbine Generator & Auxiliaries
12. |
Steam Turbine |
87 |
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12.1 |
General |
87 |
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12.2 |
Turbine casing |
90 |
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12.3 |
Turbine rotor |
91 |
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12.4 |
Nozzles and blades |
91 |
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12.5 |
Bearings |
92 |
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12.6 |
Turning gear |
92 |
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12.7 |
Gland sealing system (steam turbine and TD-BFP |
92 |
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drive) |
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12.8 |
Steam admission valves (emergency stop, reheat stop, |
93 |
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interceptor stop valves and control valves) |
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12.9 |
Nonreturn valves (NRVs) |
93 |
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12.10 |
Insulation (steam turbine and BFP drive turbine) |
94 |
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12.11 |
Turbine governing system |
94 |
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12.12 |
Turbine protective devices |
95 |
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12.13 |
Unloading devices |
95 |
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12.14 |
Turbine lubricating oil system |
96 |
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12.15 |
Turbine lubricating oil purification system |
96 |
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12.16 |
Turbine control fluid system |
97 |
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12.17 |
Central turbine lubricating oil storage oil and |
97 |
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purification system |
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13. |
Steam Condensing Plant |
98 |
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13.1 |
General requirement |
98 |
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13.2 |
Condenser |
99 |
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13.3 |
Condenser air evacuation pumps |
102 |
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13.4 |
Condenser on load tube cleaning system |
103 |
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13.5 |
Condensate extraction pumps (CEP) |
103 |
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13.6 |
Strainers at suction of condensate extraction pumps |
105 |
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13.7 |
Drip pumps (if applicable) |
106 |
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13.8 |
Debris filters (as applicable for sea water based system) |
106 |
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iii |
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Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Units
14. |
Feed Water Heating Plant and Flash Tanks |
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107 |
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14.1 |
General requirements |
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107 |
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14.2 |
Low pressure heaters and drain cooler |
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108 |
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14.3 |
Deaerator |
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109 |
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14.4 |
High pressure heaters |
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110 |
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14.5 |
Flash tanks |
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111 |
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15. |
Boiler Feed Pumps |
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113 |
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15.1 |
Number and type |
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113 |
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15.2 |
Pump sizing |
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113 |
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15.3 |
Design requirements |
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114 |
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15.4 |
Operational and maintenance requirements |
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116 |
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15.5 |
Mechanical seals |
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117 |
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15.6 |
Hydraulic coupling and gear boxes |
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117 |
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15.7 |
Drive turbine |
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118 |
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16. |
Generator and Auxiliary Systems |
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122 |
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16.1 |
Generator |
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122 |
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16.2 |
Generator auxiliary systems |
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129 |
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Section 4: Control & Instrumentation System |
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17. |
Control & Instrumentation System |
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135 |
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17.1 |
General |
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135 |
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17.2 |
Distributed digital control, monitoring and information |
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137 |
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system (DDCMIS) |
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17.3 |
SG & TG related other control & instrumentation |
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161 |
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systems/ equipments |
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17.4 |
Plant performance, analysis, diagnosis & optimization |
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168 |
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(PADO) software |
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17.5 |
PLC based miscellaneous control systems |
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169 |
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Section 5: Miscellaneous Systems, Piping, Valves, Insulation etc. |
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18. |
Power Cycle Piping, Valves and Thermal Insulation |
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171 |
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18.1 |
Power cycle piping |
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171 |
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18.2 |
Control valves |
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180 |
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iv |
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Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Units
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18.3 |
Thermal insulation |
181 |
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18.4 |
Refractories |
184 |
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19. |
Steam Turbine HP-LP Bypass System |
185 |
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19.1 |
Purpose |
185 |
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19.2 |
General requirements |
185 |
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20. |
Auxiliary Steam Pressure Reducing & Desuperheating |
187 |
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System |
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21. |
Equipment Cooling Water (ECW) System |
189 |
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21.1 |
General |
189 |
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21.2 |
System requirements |
189 |
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21.3 |
Design requirements |
190 |
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21.4 |
Sizing criteria |
193 |
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22. |
Condensate Polishing Plant |
194 |
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22.1 |
General |
194 |
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22.2 |
Salient design data |
194 |
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22.3 |
System requirements for CPU |
195 |
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22.4 |
System requirements for external regeneration facility |
197 |
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22.5 |
Control and operation of condensate polishing plant |
199 |
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23. |
Chemical Dosing System |
201 |
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23.1 |
General |
201 |
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23.2 |
Oxygen dosing system |
201 |
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23.3 |
All volatile treatment (AVT) system |
202 |
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24. |
EOT Crane |
203 |
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Annexure- 1 : |
CEA letter dated 24th August, 2009 constituting the |
205: 207 |
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Committee |
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v
Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Units
SECTION -1
GENERAL