Guide to selection and application of boiler fans for power plants
1 Scope
This standard specifies the basic requirements for the selection and application of boiler fans for power plants as well as for arrangement and design of inlet and outlet pipelines of fans.
This standard is applicable to forced draft fan, induced draft fan, primary fan, exhauster (pulverized coal fan), flue-gas recirculating fan, booster fan of flue gas desulfurization device and seal air fan for coal mill. Reference may be made to this standard for other small fans for boilers, such as ignition fan, cooling fan and dilution fan of SCR denitration system.
This standard is not applicable to oxidation fans of desulfurization systems and high-pressure fluidization fans of circulating fluidized bed boilers.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1236 Industrial fans - Performance testing using standardized airways
GB/T 2888 Methods of noise measurement for fans blowers compressors and roots blowers
GB/T 3235 Basic types sizes parameters and characteristics curve of fans
GB/T 3947 Acoustical terminology
GB/T 10178 Industrial fans - Performance testing in situ
GB/T 17774 Industrial fans - Dimensions
GB/T 19075 Industrial fans - Vocabulary and definitions of categories
GB 50660 Code for design of fossil fired power plant
DL/T 469 Fans performance testing in situ for power boiler
DL/T 5121 Technical code for design of thermal power plant air & flue gas ducts/ raw coal & pulverized coal piping
DL/T 5145 Technical code for design and calculations of coal pulverizing system of fossil-fired power plant
DL 5190.2 Technical specification for thermal power erection and construction - Part 2: boiler unit
JB/T 4358 Centrifugal fan for boiler of power station
JB/T 4362 Power station axial fans
JB/T 6891 Technical specification for silencer of fan
JB/T 8689 Fan vibration detection and its limited value
JB/T 8690 Industrial fans noise limited value
JB/T 8822 High temperature centrifugal fan - Specification
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
forced draft fan; FDF
fan that supplies air needed for boiler fuel combustion and is arranged in front of the boiler air preheater, which sends the air sucked from the atmosphere to the air preheater to heat it to the design temperature, then, for direct-fired pulverizing system, sends the air directly into the boiler furnace through the burner as the secondary air of the boiler and, for the middle storage pulverizing system, sends one part of the air directly into the boiler furnace through the burner as the secondary air of the boiler and the other part of the air into pulverized coal preparation system as desiccant or into furnace as primary air conveying the pulverized coal through burner (exhaust gas pulverized coal feeding system) or into furnace as tertiary air through the burner (hot air pulverized coal feeding system); large boilers adopting medium speed coal mills or double-inlet and double-outlet low speed coal mill positive pressure direct-fired pulverizing system are all equipped with high-pressure cold primary fans which either draw air from the outlet of the forced draft fan which supplies the total air volume required by the boiler or draw air from the atmosphere, in which case the forced draft fan only supplies the secondary air to the boiler, which is also called the secondary air fan.
3.2
induced draft fan; IDF
fan installed behind the boiler dust remover, sucking out the boiler combustion products (flue gas) from the boiler tail and sending to the booster fan of the desulfurization system after passing through the denitration system and dust removal system and, after the flue gas pressure is raised by the booster fan, discharging the flue gas into the atmosphere from the chimney through desulfurization system, also known as the suction fan, which shall overcome the resistance of the whole flue gas system from boiler furnace to chimney outlet if there is no booster fan, in which case it is commonly known as 2-in-1 induced draft fan
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Design requirements of fans
5 Type selection of fans
6 Fan operation
7 Fan noise
8 Test and acceptance of fan
9 Fan system design
Annex A (Informative) Necessary information on selection of fan
Annex B (Informative) Necessary information for evaluation of fan design
Annex C (Informative) Calculation of standard density of humid air
Guide to selection and application of boiler fans for power plants
1 Scope
This standard specifies the basic requirements for the selection and application of boiler fans for power plants as well as for arrangement and design of inlet and outlet pipelines of fans.
This standard is applicable to forced draft fan, induced draft fan, primary fan, exhauster (pulverized coal fan), flue-gas recirculating fan, booster fan of flue gas desulfurization device and seal air fan for coal mill. Reference may be made to this standard for other small fans for boilers, such as ignition fan, cooling fan and dilution fan of SCR denitration system.
This standard is not applicable to oxidation fans of desulfurization systems and high-pressure fluidization fans of circulating fluidized bed boilers.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1236 Industrial fans - Performance testing using standardized airways
GB/T 2888 Methods of noise measurement for fans blowers compressors and roots blowers
GB/T 3235 Basic types sizes parameters and characteristics curve of fans
GB/T 3947 Acoustical terminology
GB/T 10178 Industrial fans - Performance testing in situ
GB/T 17774 Industrial fans - Dimensions
GB/T 19075 Industrial fans - Vocabulary and definitions of categories
GB 50660 Code for design of fossil fired power plant
DL/T 469 Fans performance testing in situ for power boiler
DL/T 5121 Technical code for design of thermal power plant air & flue gas ducts/ raw coal & pulverized coal piping
DL/T 5145 Technical code for design and calculations of coal pulverizing system of fossil-fired power plant
DL 5190.2 Technical specification for thermal power erection and construction - Part 2: boiler unit
JB/T 4358 Centrifugal fan for boiler of power station
JB/T 4362 Power station axial fans
JB/T 6891 Technical specification for silencer of fan
JB/T 8689 Fan vibration detection and its limited value
JB/T 8690 Industrial fans noise limited value
JB/T 8822 High temperature centrifugal fan - Specification
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
forced draft fan; FDF
fan that supplies air needed for boiler fuel combustion and is arranged in front of the boiler air preheater, which sends the air sucked from the atmosphere to the air preheater to heat it to the design temperature, then, for direct-fired pulverizing system, sends the air directly into the boiler furnace through the burner as the secondary air of the boiler and, for the middle storage pulverizing system, sends one part of the air directly into the boiler furnace through the burner as the secondary air of the boiler and the other part of the air into pulverized coal preparation system as desiccant or into furnace as primary air conveying the pulverized coal through burner (exhaust gas pulverized coal feeding system) or into furnace as tertiary air through the burner (hot air pulverized coal feeding system); large boilers adopting medium speed coal mills or double-inlet and double-outlet low speed coal mill positive pressure direct-fired pulverizing system are all equipped with high-pressure cold primary fans which either draw air from the outlet of the forced draft fan which supplies the total air volume required by the boiler or draw air from the atmosphere, in which case the forced draft fan only supplies the secondary air to the boiler, which is also called the secondary air fan.
3.2
induced draft fan; IDF
fan installed behind the boiler dust remover, sucking out the boiler combustion products (flue gas) from the boiler tail and sending to the booster fan of the desulfurization system after passing through the denitration system and dust removal system and, after the flue gas pressure is raised by the booster fan, discharging the flue gas into the atmosphere from the chimney through desulfurization system, also known as the suction fan, which shall overcome the resistance of the whole flue gas system from boiler furnace to chimney outlet if there is no booster fan, in which case it is commonly known as 2-in-1 induced draft fan
Contents of DL/T 468-2019
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Design requirements of fans
5 Type selection of fans
6 Fan operation
7 Fan noise
8 Test and acceptance of fan
9 Fan system design
Annex A (Informative) Necessary information on selection of fan
Annex B (Informative) Necessary information for evaluation of fan design
Annex C (Informative) Calculation of standard density of humid air
