1 Scope 1
2 Normative References 2
3 Terms,Definitions,and Symbols 4
3.1 Terms and Definitions 4
3.2 Symbols 14
4 General Provisions 15
5 Type and Quality of Coal 19
5.1 Design Coal and Check Coal 19
5.2 Coal Quality Analysis Items 20
5.3 Verification and Confirmation of Coal Quality Analysis Data 23
5.4 Limestone/Lime Analysis Data 23
6 Evaluation of Coal Quality Level 25
6.1 Coal Type and Coal Quality Level 25
6.2 Evaluation Indices of Coal Quality 29
7 Selection of Air and Flue Gas System for Boiler Units 34
7.1 Air and Flue Gas System 34
7.2 System for Heating the Inlet Air of Air Preheater 37
7.3 Gas Exhaust System of Flue Gas Treatment Process 38
8 Thermodynamic Calculation of Combustion System 40
8.1 General Requirements 40
8.2 Original Data 40
8.3 Boiler Efficiency 45
8.4 Calculation of Fuel Consumption 47
8.5 Calculation of Amount of Air Required for Burning 1 kg Coal,and Composition of the Produced Flue Gas 51
8.6 Temperature and Pressure of Air and Flue Gas 58
8.7 Balancing and Coordination of Air Flow within Combustion System 62
8.8 Calculation of Air and Flue Gas Flows at Various Positions of Boiler Unit 70
8.9 Calculation of Dew Points of Air and Flue Gas 72
8.10 Calculation of Carbon Dioxide Emission Flow 77
9 Flue Gas Flow and Thermodynamic Calculation of Flue Gas Purification System 79
9.1 Flue Gas Flow Calculation of Dry Dedusting System 79
9.2 Flue Gas Flow and Thermodynamic Calculation of Wet or Semi-dry Purification System 80
9.3 Thermodynamic Calculation of Wet FGD System 82
9.4 Thermodynamic Characteristics Calculation for Humidified Flue Gas 84
9.5 Temperature Drop Calculation of Stack 88
10 Thermodynamic Calculations of the Preheater Inlet Air Heating System 89
10.1 General Requirements 89
10.2 Thermodynamic Calculation of Hot Air Recirculation Heating System 90
10.3 Thermodynamic Calculation of Steam Air Heater System 91
11 Aerodynamic Calculation of Combustion System 94
11.1 General Requirements 94
11.2 Design Optimization for the Through-flow Part of Flue Gas and Air Ducts 96
11.3 Selection of Medium Flow Velocity in the Ducts of Combustion System 96
11.4 Frictional Resistance of Flue Gas and Air Ducts 97
11.5 Local Resistance of Flue Gas and Air Ducts 99
11.6 Provisions for Simplified Calculation of Resistance of Flue Gas and Air Ducts 107
11.7 Equipment Resistance 109
11.8 Stack Draft 109
11.9 Stack Resistance 110
11.10 Calculation Resistance of the System and the Corrections 113
12 Selection of Fans for Combustion System 114
12.1 Selection of Types,Number,Air Flows,and Pressure Heads of Fans 114
12.2 Selection of Speeds of Fans 117
12.3 Calculation for Selecting Types of Fans 118
12.4 Selection of Model Sizes of Fans 124
12.5 Selection of Driving Mode and Regulation Mode of Fans 125
12.6 Determination of Power of Fan Motors 125
13 Selection of Precipitator 127
13.1 General Requirements 127
13.2 Electrostatic Precipitator 127
13.3 Fabric Filters 130
14 Type Selection of Stacks and Associated Calculations 134
14.1 General Requirements 134
14.2 Selection of Number and Heights of Stacks and Inner Diameters of Cylinder Outlets 135
14.3 Determination of Upper Limit of the Exit Gas Flow 136
14.4 Distribution Characteristics of Static Pressure within Inner Cylinders of Stack 139
14.5 Type Selection and Design of Wet Stacks 140
15 Furnace Safeguard Supervisory System and Explosion,Implosion,and Fire Prevention Measures of Combustion System 141
15.1 General Requirements 141
15.2 Implosion and Explosion Prevention Design Pressure of Furnace 141
15.3 Implosion and Explosion Prevention Design Pressure of Air and Flue Gas System 143
15.4 Provision of Implosion or Explosion Vents at Furnace and the Flue Ducts at Boiler Tail 145
15.5 Fire Prevention Measures of Regenerative Air Preheaters and Flue Ducts at Boiler Tail 145
15.6 Explosion Prevention Measures of Plasma Ignition System 146
Appendix A（Normative） Symbols 147
Appendix B（Normative） Thermal Calculation Method for Combustion System of Boilers Employing Limestone for Flue Gas Desulpherization 153
Appendix C（Informative） References for Design Calculation of Combustion System 157
Appendix D（Normative） Type Selection of Through Flow Components of Air and Flue Gas Ducts 224
Appendix E（Normative） Analysis Methods for Coal Consumption and Thermal Parameters of Boilers When Raising the Inlet Air Temperature of Air Preheater 241
Appendix F（Informative） Aerodynamic Characteristics Verification for Vibration Prevention and Noise Reduction of Air and Flue Gas System 244