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DL/T 468-2019 English PDF

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DL/T 468-2019: Guide on type selection and application for power boiler fans
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DL/T 468: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
DL/T 468-2019English789 Add to Cart 5 days [Need to translate] Guide on type selection and application for power boiler fans Valid DL/T 468-2019
DL/T 468-2004EnglishRFQ ASK 6 days [Need to translate] Guide on type selection and application for power boiler fans Obsolete DL/T 468-2004
DL 468-1992EnglishRFQ ASK 3 days [Need to translate] (Power boiler fan selection and use of guidelines) Obsolete DL 468-1992

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Standard similar to DL/T 468-2019

GB/T 4976   JB/T 6430   GB/T 2888   

Basic data

Standard ID DL/T 468-2019 (DL/T468-2019)
Description (Translated English) Guide on type selection and application for power boiler fans
Sector / Industry Electricity & Power Industry Standard (Recommended)
Classification of Chinese Standard J72
Word Count Estimation 34,314
Date of Issue 2019-06-04
Date of Implementation 2019-10-01
Older Standard (superseded by this standard) DL/T 468-2004
Regulation (derived from) Natural Resources Department Announcement No. 7 of 2019
Issuing agency(ies) National Energy Administration

DL/T 468-2019: Guide on type selection and application for power boiler fans

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Guide to selection and application of boiler fans for power plants ICS 27.060.01 J 72 People's Republic of China Electric Power Industry Standard Replace DL/T 468-2004 Guidelines for Selection and Use of Fans for Power Station Boilers 2019-06-04 released 2019-10-01 implementation Issued by National Energy Administration

Table of contents

Foreword...II 1 Scope...1 2 Normative references...1 3 Terms and definitions...1 4 Design requirements for fans...4 5 Fan selection...5 6 Fan operation...8 7 Fan noise...9 8 Test and acceptance of fan...9 9 Fan system design...11 Appendix A (informative appendix) Necessary information for fan selection...25 Appendix B (Informative Appendix) Necessary information for evaluating fan design...28 Appendix C (Informative Appendix) Calculation of Humid Air Standard Density...34

Foreword

This standard is drafted in accordance with GB/T 1.1-2009 "Guidelines for Standardization Part 1.Standard Structure and Writing Rules". Please note that certain contents of this standard may involve patents. The issuing organization of this standard does not bear the responsibility for identifying these patents. This standard replaces DL/T 468-2004 "Guidelines for Selection and Use of Fans for Power Station Boilers". This standard is compared with DL/T 468-2004, except The main technical content changes are as follows. -Revised Chapter 3 "Terms and Definitions", the definitions of blower and induced draft fan; -Added Chapter 3 "Terms and Definitions", the definition of the stall safety factor of axial flow fans; --- Added Chapter 3 "Terms and Definitions", definitions of basic air volume, basic pressure and selection conditions; -The title of Chapter 4 "Design Requirements for Fans" is revised; -Deleted Chapter 4 "Design Requirements for Fans", related content about fan manufacturing requirements; -Revised the title of Chapter 5 "Van Type Selection"; --- Added Chapter 5 "Fan Selection", giving out the original data requirements for fan selection; -Modified Chapter 5 "Fan Selection", the requirements on the selection of fan speed; -Modified Chapter 5 "Selection of Fans", the requirements on the number of fans selected; -Modified Chapter 5 "Fan Selection", the requirements on fan adjustment methods; -Modified Chapter 5 "Fan Selection", the requirements on the stall safety factor of the axial flow fan; -Deleted Chapter 6 "Installation of Fans" of the original standard; --The serial number of Chapter 7 of the original standard has been revised to 6, and the serial numbers of subsequent chapters have been extended; -Modified Chapter 6 "Fan Operation", the requirements for operating parameter control. This standard was proposed by the China Electricity Council. This standard is under the jurisdiction of the Power Plant Boiler Standardization Technical Committee (DL/T C08). Drafting organization of this standard. Xi'an Thermal Power Research Institute Co., Ltd. Drafters of this standard. Liu Jiayu, Dong Kangtian, Yan Hong, Zheng Jin. The opinions or suggestions during the implementation of this standard are fed back to the Standardization Management Center of China Electricity Council (No. 2 Baiguang Road, Beijing) One, 100761). Guidelines for Selection and Use of Fans for Power Station Boilers

1 Scope

This standard specifies the basic requirements for the selection, use, and layout design of fan inlet and outlet ducts for power station boiler fans. This standard applies to the blower, induced draft fan, primary fan, exhaust fan (pulverized coal fan), flue gas recirculation fan, The booster fan of the flue gas desulfurization device and the sealed fan for the coal mill. Other small fans for boilers such as ignition fan, cooling fan, SCR The dilution fan of the denitration system can be used as reference. This standard does not apply to oxidation fans of desulfurization systems and high-pressure fluidized fans of circulating fluidized bed boilers.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document. GB/T 1236 Industrial ventilators use standardized ducts for performance testing (IDT ISO 5801..1997) GB/T 2888 Noise measurement method for fans and Roots blowers GB/T 3235 Ventilator basic type, size parameter and performance curve GB/T 3947 Acoustic terms GB/T 10178 Field Performance Test of Industrial Ventilator (IDT ISO 5802.2001) GB/T 17774 Industrial Ventilator Dimensions GB/T 19075 Industrial Ventilator Vocabulary and Type Definition GB 50660 Design Code for Large and Medium-sized Thermal Power Plants DL/T 469 Field Performance Test of Power Station Boiler Fan DL/T 5121 Technical specification for design of smoke, wind and pulverized coal pipelines in thermal power plants DL/T 5145 Technical Regulations for Design and Calculation of Pulverizing System in Thermal Power Plants DL 5190.2 Technical Code for Power Construction Construction Part 2.Boiler Unit JB/T 4358 Centrifugal fan for power station boiler JB/T 4362 Axial fan for power station JB/T 6891 Technical conditions of muffler for fan JB/T 8689 Ventilator vibration detection and its limits JB/T 8690 Noise limit of industrial fans Technical conditions of JB/T 8822 high temperature centrifugal fan

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 A fan that supplies the air required for the fuel combustion of the boiler. Arranged before the boiler air preheater. Send air sucked from the atmosphere into the air The preheater, after being heated to the design temperature, is used as the secondary air of the boiler for the direct-blowing pulverizing system and is directly sent into the boiler furnace through the burner; For the silo-type pulverizing system, part of it is used as the secondary air of the boiler, which is directly sent to the boiler furnace through the burner, and the other part enters the pulverized coal The preparation system is used as a desiccant, and then, or used as primary air to transport pulverized coal into the furnace through the burner (exhausted gas powder delivery system), or as a third The air is sent into the furnace through the burner (hot air powder feeding system). Large-scale boiler adopts medium-speed coal mill or double-inlet and double-outlet steel ball coal mill with positive pressure direct blowing system The powder system is equipped with a high-pressure cooling primary fan. If the primary fan draws air from the outlet of the blower, the blower supplies the total air required by the boiler There are also those designed to inhale air from the atmosphere. At this time, the blower only supplies the secondary air of the boiler, also known as the secondary fan. 3.2 Induced draft fan (IDF) Installed after the boiler dust collector, the boiler combustion products (flue gas) are sucked out from the tail of the boiler and sent into the denitrification system and dust removal system The booster fan of the desulfurization system is a fan that is discharged into the atmosphere from the chimney through the desulfurization system after the pressure is increased, also called a suction fan. If there is no booster fan, The resistance of the entire flue gas system from the boiler furnace to the chimney outlet is overcome by the induced draft fan (commonly known as the two-in-one induced draft fan). 3.3 Primary fan (PF) A fan that supplies the primary air required for the fuel combustion of the boiler. According to its installation position in the system, there are cold primary fans and hot primary fans Minute. 3.4 Cold primary fan Installed before the boiler air preheater, the air sucked from the atmosphere or the cold air duct at the outlet of the blower is heated by the air preheater and then sent It is sent to the primary fan of the pulverizing system. 3.5 Hot primary fan Installed after the boiler air preheater, the hot air heated by the boiler air preheater is sent to the direct blowing pulverizing system or only The primary fan that sends pulverized coal into the boiler. 3.6 Powder exhaust fan exhauster The fan used in the pulverized coal preparation system to transport desiccant and pulverized coal. Mainly used in the intermediate storage bin type powder system, installed in the fine powder After the device. Also known as pulverized coal fan. 3.7 Flue-gas recirculating fan Take a part of the flue gas from the front of the air preheater after the economizer, the lower part of the furnace, after the electric dust removal, the outlet of the induced draft fan, etc., and transport it into the pot Furnace cold ash hopper or upper part of the furnace, used to adjust the boiler steam temperature; or sent to the inlet of the coal mill to adjust the temperature or oxygen content of the fan. 3.8 Flue gas desulfurization booster fan (FGDP fan or BUF) DL/T 468-2018 A fan installed behind the induced draft fan to overcome the resistance of the flue gas desulfurization system. 3.9 Seal air fan Fans that supply air for sealing in medium-speed coal mills, double-inlet and double-outlet steel ball coal mills and coal feeders. The sealed fan can be directly from the atmosphere Inhale air, or from the outlet duct of the blower or primary fan. 3.10 A1 inlet plane and inlet area of fan Take the interface at the upstream end of the air conveying device as the fan inlet plane. Usually, take the inlet of the casing (the fan with the air intake box takes the air intake box) The total flow area of the (flange) plane is used as the fan inlet area. 3.11 A2 outlet plane and outlet area of fan The interface at the beginning of the downstream section of the air conveying device is taken as the fan outlet plane. Generally, the total area of the plane of the outlet (flange) of the casing is taken as the wind Machine exit area. 3.12 Stall safety factor of axial flow fans This standard indicates the amount of stall margin of axial flow fan, expressed by k (see 5.6.4). 3.13 Fan system In order to convey air or gas from one or more places to another or more places, the fans and the equipment on the conveying path and a series of air ducts and pipes A system composed of roads, bends and branch pipes. 3.14 System characteristic curves The system characteristic curve is an illustration of the resistance of a certain system to the characteristic of volume flow. 3.15 System effect The influence of system layout on fan performance is called system effect. The performance of the ventilator is affected by its inlet and outlet connecting pipes. If even Improper connection, uneven airflow at the inlet, and vortex at the inlet of the ventilator will change the aerodynamic characteristics of the ventilator and reduce the ventilator Performance. 3.16 System effect loss The decrease in fan pressure caused by system effects. DL/T 468-2018 3.17 Base flow The fan flow required for the maximum continuous evaporation of the boiler calculated according to the design coal type. 3.18 Base pressure The total resistance of the fan system when the boiler is operating with the maximum continuous evaporation calculated by the design coal type. 3.19 Selection condition (TB condition) test block The maximum continuous operating conditions that the fan should reach when the selection requires. 3.20 Specific A sound level (LSA) The A sound level is the A sound level per unit flow rate and unit fan pressure.

4 Design requirements of the fan

4.1 General requirements 4.1.1 The design of the fan should meet the requirements of GB/T 3235 and GB/T 17774. 4.1.2 The design and manufacture of centrifugal fans should meet the requirements of JB/T 4358. 4.1.3 The design and manufacture of axial fans shall comply with the requirements of JB/T 4362. 4.1.4 The natural vibration frequency of the fan impeller (or blade) should avoid the speed frequency of the impeller and its multiplication frequency below 10 times and other dangerous frequencies, such as The passing frequency of blades is the speed (fans that adopt speed adjustment include all speeds within the speed adjustment range) and the number of blades (including rotor blades). And the product of the front and rear adjustment of the impeller or the guide blade), the high-amplitude airflow pulsation frequency, etc. 4.1.5 For fans with variable speed adjustment, calculation of torsional vibration of the shaft system shall be carried out to prevent the occurrence of shaft system torsional vibration. 4.1.6 The fan should be equipped with necessary automatic alarm and protection devices (such as bearing temperature, oil cut, vibration and stall surge of axial fan, etc.). 4.1.7 Fans that suck from the atmosphere (such as blowers and primary fans) should be equipped with imported mufflers. The design and manufacture of the mufflers should comply with JB/T The provisions of 6891. 4.2 Design requirements 4.2.1 The designed inlet air temperature of the hot primary fan is 250°C, and the maximum allowable inlet air temperature does not exceed 400°C. The air is densely dusty. The degree does not exceed 100mg/m3.Its design should comply with the regulations of JB/T 8822. 4.2.2 The flue gas system upstream of the induced draft fan is equipped with a low-temperature economizer system, and the inlet temperature of the induced draft fan is about 90℃, which is corrosive. Reliable anti-corrosion measures should be taken for the flow part of the fan. 4.2.3 The design of the exhaust fan (pulverized coal fan) requires that the conveyed medium is air containing pulverized coal. The pulverized coal content of the steel ball mill The exhaust gas of the bin-type pulverizing system is not more than 80g/m3, and for the negative pressure direct-blowing pulverizing system, it is 300g/m3～800g/m3.Its designed inlet gas temperature The temperature is 700℃, and the maximum allowable inlet gas temperature is 150℃. The casing and impeller should be based on the wear characteristics of coal (see DL/T for the wear index 5145) Take anti-wear measures, and the service life of its impeller is not less than 8000h. 4.2.4 The design of the flue gas recirculation fan requires that the transported medium is hot flue gas with an ash content of not more than 20g/m3 and a temperature of not more than 400℃. its The volute and the impeller should take appropriate anti-wear measures; the bearing should be equipped with special heat insulation and cooling devices, and its service life should not be less than 8000h. The flue gas recirculation machine without speed control device should be equipped with a cranking device. 4.2.5 The design of the sealed fan shall adopt noise reduction measures. For sealed fans that directly suck in air from the atmosphere, they should be equipped with inlet filters and inlets and outlets. silencer.

5 Selection of fan

5.1 Raw data that should be provided for selecting the fan The original data that should be provided for selecting a wind turbine include at least the following. a) Local atmospheric conditions. 1) Atmospheric pressure; 2) Dry and wet air temperature; 3) Relative humidity of air. b) Boiler thermal calculation and aerodynamic calculation results; c) Fan parameters of the boiler under various typical working conditions. 1) Flow rate (air volume, flue gas volume); 2) The total resistance of the fan inlet side system (that is, the total pressure of the fan inlet) and the corresponding dynamic pressure of the fan inlet air duct section; 3) The total resistance of the system on the outlet side of the fan (that is, the total pressure at the outlet of the fan); 4) The total resistance of the wind (smoke) system (ie the pressure of the fan, formerly called the total pressure of the fan); 5) Medium temperature; 6) The standard density of the medium (the air medium is the standard density of the local moist air; the flue gas medium is the standard density of the wet smoke at the fan inlet degree). d) The annual operating hours of the unit under different loads. 5.2 Determination of fan selection parameters 5.2.1 The basic air volume is determined according to the following requirements. a) For the fans of newly-built boilers, the basic air volume shall be determined according to the relevant regulations of GB 50660. b) For the retrofitted fan that has been put into operation, the basic air volume needs to be determined by field tests. No less than three test conditions (in the high, medium, and Under three low loads), and convert the test results to the flow rate under the maximum continuous evaporation capacity (BMCR) of the boiler. 5.2.2 The basic wind pressure is determined according to the following requirements. a) For the fan of a newly built boiler, the basic air pressure is calculated according to the relevant regulations of GB 50660, and the calculated fan system resistance Liyi refers to the actual operating value of the same type of unit to determine whether adjustment is needed. b) For the retrofitted fan that has been put into operation, the basic wind pressure is determined by field test (the wind pressure test should be carried out simultaneously with the flow test, and Collect the resistance of the main equipment and related pipelines in the system through the DCS system). Measure and/or pass SIS when necessary The system collects and checks the inlet and outlet pressure values of the fan when the unit is fully loaded in the past year. The corresponding system (including The resistance changes caused by the modification of other equipment in the system. And convert it to the maximum continuous evaporation capacity (BMCR) of the boiler The total resistance of the system is determined as the basic wind pressure for fan selection. 5.2.3 Air volume and wind pressure margin are selected according to the following requirements. a) For the fan of a newly-built boiler, the margin of flow and pressure should be selected within the range of relevant regulations in GB 50660. b) Transformation of fans that have been put into operation, fan flow rate and pressure margin, should consider the climatic conditions during the test period and the local summer and winter seasons before the change. Determined on the basis of factors such as differences, boiler equipment and flue gas system operating conditions, unit load factor and coal quality change range; It can also be selected within the specified range of GB 50660. 5.3 Selection of fan speed, number and type 5.3.1 Selection of fan speed. Generally, a 4-pole motor (1490r/min) should be used for the primary fan; a 4-pole or 6-pole motor should be used for the blower. Pole motor (1490r/min or 990r/min); the speed of the induced draft fan and desulfurization booster fan should be a motor with 6 poles or less (that is, the highest 990r/min), for the stator-blade-adjusted axial-flow induced draft fan with the combined induction and booster fans with variable speed regulation, the higher than The speed is 990 r/min, but it needs to meet the requirements of structural strength and rigidity reliability. 5.3.2 The selection of the number of fans is in accordance with the following requirements. a) For units of 50MW and above, the number of boiler fans should comply with the relevant regulations of GB 50660 (the primary fan for delivery, induction and cooling should be Set up 2 sets; the number of booster fans should be the same as the number of desulfurization devices; the number of pulverizers should be the same as the number of coal mills; the pulverizing system Two sealed fans are installed for each furnace, one for transportation and one for preparation). b) One blower and two induced draft fans should be installed for the boiler supporting the 25MW-class unit, but one fuel gas negative pressure boiler should be installed A blower and an induced draft fan. c) One blower and one induced draft fan should be installed for boilers supporting units of 12MW and below. d) For 50MW～600MW-class generating units, if it is feasible through technical and economic demonstration and reliability demonstration, only one transmitter per boiler can be used. Fans, one induced draft fan and one primary fan. e) Depending on the layout conditions and the design load rate of the unit, 3 to 4 induced draft fans can also be installed when it is technically and economically feasible. 5.3.2 Selection of the fan type According to the TB working condition parameters and the selected fan speed, the specific speed of the required fan is calculated, and then the best specific speed is selected. Close fan type. For given parameters, when several different types of fans can be selected, it should be based on the annual load curve of the boiler unit, Fan power consumption, regulation efficiency, equipment cost, maintenance cost and other factors are selected by comprehensive technical and economic comparison. Ratio of different types of fans Refer to Table 1 for the reference range of speed. 5.4 Selection of fan model 5.4.1 The principles to be followed to determine the fan model are as follows. a) After the fan model is determined, the fan model can be determined according to similar design methods, and the resistance line of the system should completely fall on the selected fan Within the stable region of the energy curve, and the stall margin is sufficient, see 5.6.4. b) For centrifugal fans, avoid areas with high air flow pulsation. c) When different types or models of fans can be selected, after satisfying the requirements of safe operation, it should be based on unit load, utilization hours, design Technical and economic indicators such as reserve costs and annual maintenance costs determine the fan model. 5.4.2 The model of centrifugal fan should be selected so that the selection operating point (ie TB point) is as close as possible to the flow-pressure at the maximum opening of the regulating device. The force curve is located on the right side of the maximum efficiency of the fan, and its efficiency value should not be lower than 90% of the maximum efficiency of the fan. 5.4.3 The model of axial flow fan should be selected under the premise that the fan selection working condition point (TB point) can operate safely and reliably, and the power generation should be made. When the unit is operating under economic load (generally the rated output of the generator set), the fan runs in the highest efficiency zone. 5.4.4 The selection of axial flow fan should ensure sufficient stall margin. The definition and requirements of stall margin (stall safety factor) are as follows. a) The stall margin can be expressed by the stall safety factor k, which is determined by each design operating point and the corresponding opening (moving blades are adjusted to the blade angle, The stator blade is adjusted to adjust the flow and pressure of the stall operating point (or the maximum pressure point) of the angle of the guide vane, and calculated by the following formula Out. b) In the selection and design, the k value of each design operating point should be greater than 1.35, that is, k >1.35. 5.5 Selection of fan adjustment mode 5.5.1 For the moving blade adjustment axial flow fan, when the unit design load factor is less than 70%, and the design speed is below 1000r/min, the dynamic Axial-flow fan with blade adjustment should use two-speed motor to adjust the number of poles or use a variable speed device (frequency converter, steam turbine drive or other variable speed device). Set) adjustment, switch or adjust to low speed operation when the unit is running at low load. Special attention. the selection of the axial flow fan When adjusting the speed, the manufacturer’s guarantee for the safety and reliability of the equipment's variable speed operation should be obtained. 5.5.2 For the stationary blade adjustment axial flow fan, when the unit design load factor is less than 80%, the stationary blade adjustment axial flow fan should be selected. Speed device (frequency converter, steam turbine drive or other variable speed device) adjustment. 5.5.3 For centrifugal fans, inlet guides are generally selected for adjustment; in order to obtain better economy, a two-speed motor should be used for pole-changing adjustment. Section or variable speed device (frequency converter, steam turbine drive or other variable speed device) adjustment. 5.5.4 For the powder exhaust fan (generally centrifugal), it is usually appropriate to choose the inlet throttle adjustment; the inlet adjustment door can also be used for adjustment, but it should be The entrance ...

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