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Axial fan with adjustable stator blade

key word:Heat exchange element

Category:


Product description

Axial fan with adjustable stator blade

 

1. Introduction

1.1. Application

It is mainly used for flue gas and air, desulfurization and denitrification environmental protection devices of large power station boilers.

1.2. Model meaning

1.2.1. The model and significance of G-type meridional accelerating stationary blade adjustable axial flow fan are as follows:

G 150 / 3580

G -- Meridional Acceleration axial flow fan

150 ------ the ratio of the nominal outer diameter of the impeller to the inner diameter of the impeller multiplied by 100

3580 -- round value of nominal outer diameter of impeller (mm)

1.2.2. RTF type axial flow fan with adjustable stationary blade is as follows:

RTE28-16-1

R - desulfurization and denitrification fan (induced draft fan)

T -- inlet guide vane regulation

F ------ movable blade adjustable (shutdown)

28 -- roundness value of nominal outer diameter of impeller (dm)

16 -- roundness value of hub diameter (dm)

1- stage (1-single-stage; 2-double stages)

1.3. Structural features

The large-scale axial-flow fan with adjustable stator blades for SBW power station is designed and manufactured according to the technology of TLT (turbine ventilation technology company) introduced from Germany. On the basis of summing up a large number of practical operation experience data and model test of fans, a series of mature products with series design and standardized parts have been formed.

1.3.1. The basic structure of G-type meridional accelerating stationary blade adjustable axial-flow fan is as follows:

1.3.1.1. Direction of rotation. From one end of the prime mover, the fan impeller rotates anticlockwise. When 2 fans are used for one boiler, they can be arranged symmetrically according to the field operation area.

1.3.1.2. Radial intake, generally vertical intake, can also be in the horizontal direction above any angle intake.

1.3.1.3. Outlet direction. Horizontal axis.

1.3.1.4. Transmission mode. The motor and the main shaft of fan with rotor transmit power through rigid flexible coupling.

1.3.1.5. Support mode. Both ends of the main shaft of the fan with rotor are supported on the bearing pedestal; the motor, fan bearing pedestal, casing, diffuser, etc. are installed and fixed on the concrete foundation with anchor bolts.

1.3.1.6. Adjustment mode. During the operation of the fan, the angle of the inlet guide vane is adjusted by the electric actuator to change the flow and pressure of the fan to match the working condition of the system.

1.3.2. Main parts of G-type meridional accelerating stationary blade adjustable axial flow fan. The main components of G-type meridional accelerating stationary blade adjustable axial-flow fan for large-scale power station include inlet box, inlet cone-shaped pipe, casing, inlet guide vane regulating device, rotor (impeller), main shaft, bearing pedestal, rear guide vane, coupling, diffuser, inlet and outlet expansion joint, cooling fan and lubricating oil station system.

1.3.2.1. Air inlet box. An arc structure is designed below the center line of the air inlet box to reduce the loss of air flow from radial direction to axial direction, and correspondingly reduce the pulsation of air flow, which is conducive to improving the efficiency of the fan; in addition, a manhole door is set in the box to facilitate maintenance.

1.3.2.2. Casing. The casing has a horizontal split surface, which is convenient for installation and maintenance of the rotor; the front of the casing is connected with the inlet guide vane adjusting device, and the rear of the casing is connected with the diffuser through flexible shrouds, so as to isolate the vibration transmission of the casing and facilitate maintenance. There is a set of fixed guide vanes (rear guide vanes) behind the impeller in the casing.

1.3.2.3. Inlet guide vane regulating device. During the operation of the fan, the inlet air flow direction of the impeller is changed by adjusting the angle of the inlet guide vane, so as to adjust the performance of the fan and meet the different working conditions of the boiler.

1.3.2.4. Rotor. The rotor is mainly composed of the following parts:

1.3.2.4.1. Impeller. The impeller is of welded steel plate structure and fixed on the main shaft flange. The moving blade is made of twisted steel plate and welded with the outer circle surface of impeller hub according to the design angle, so it can not be adjusted. The moving blade can also be combined into main blade and flap. The moving blade formed by steel plate is welded with the outer circle surface of impeller hub, and the wing flap blade can be adjusted when parking. In order to ensure enough high temperature resistance and wear resistance, for flue gas with high dust content, measures such as solution welding cemented carbide wear-resistant layer are adopted on the working face of blade to improve the wear resistance of moving blade.

1.3.2.4.2. Spindle. The transmission shaft supporting impeller rotation and transmitting torque is the main shaft, and both ends of the main shaft are supported on the bearing pedestal.

1.3.2.4.3. Rigid flexible coupling. The main shaft of the fan is connected with the driving motor. With the help of elastic deformation of diaphragm, the installation error and the error caused by thermal expansion during operation (radial, axial and angular errors of the two shafts) are compensated.

1.3.2.5. Bearing housing. According to the speed and load of the fan, two different structural forms of rolling bearing and sliding bearing are selected, and the corresponding ones are immersion lubrication, self lubrication of oil ring or forced lubrication of oil station.

Diffuser. The function of diffuser is to change part of the dynamic pressure of impeller outlet flow into static pressure. For the convenience of maintenance, the diffuser is also provided with a manhole door.

1.3.2.7. Inlet and outlet expansion joints. The inlet of the inlet box and the outlet of the diffuser are connected with the pipe to compensate the thermal expansion of the fan and the pipe.

1.3.3. Main accessories of G-type meridional accelerating stationary blade adjustable axial fan. It generally includes driving motor, electric actuator, fan or motor oil station, primary temperature measuring element of fan or motor main bearing, fan vibration measuring probe, anti surge device, sound insulation coating technology and materials.

1.3.4. The basic structure of RTF type axial fan with adjustable stationary blade is as follows:

1.3.4.1. Direction of rotation. Viewed from the prime mover end, the fan impeller rotates anticlockwise. When 2 fans are used for one boiler, they can be arranged symmetrically according to the field operation area.

1.3.4.2. Air intake mode. Radial intake, generally vertical intake, can also be in the horizontal direction above any angle intake.

1.3.4.3. Outlet direction. Horizontal axis.

1.3.4.4. Transmission mode. The motor and the fan intermediate shaft with rotor transmit power through rigid flexible coupling.

1.3.4.5. Support mode. The motor, air inlet box, casing and diffuser are installed and fixed on the concrete foundation with anchor bolts.

1.3.4.6. Adjustment mode. During the operation of the fan, the angle of the inlet guide vane is adjusted by the electric actuator to change the airflow direction of the impeller inlet (pre rotation) to adjust the performance of the fan; when the fan is stopped, the angle of the moving blade can also be adjusted to expand the range of the fan performance adjustment.

1.3.5. Main parts of RTF type axial fan with adjustable stationary blade. The main components of RTF type axial flow fan with adjustable stationary blade for large power station include inlet box, inlet guide vane adjusting device, casing (with rear guide vane), rotor (timing wheel), bearing box, intermediate shaft, intermediate shaft cover, coupling, coupling cover, diffuser, lubricating oil station, etc.

1.3.5.1. Air inlet box. An arc structure is designed below the center line of the air inlet box to reduce the intake loss of the air flow from radial to axial direction, and reduce the flow pulsation correspondingly, which is conducive to improving the efficiency of the fan. In addition, a manhole door is set in the box to facilitate maintenance.

1.3.5.2. Casing. The casing has a horizontal split, which is convenient for installation and maintenance of the rotor; the front of the casing is connected with the inlet guide vane adjusting device, and the rear of the casing is connected with the diffuser. There is a set of fixed guide vanes (rear guide vanes) behind the impeller in the casing. The integral bearing box is fixed on the lower half flange of the casing.

1.3.5.3. Inlet guide vane regulating device. During the operation of the fan, the inlet flow direction of the impeller is changed by adjusting the angle of the inlet guide vane, so as to adjust the performance of the fan and meet the different working conditions of the boiler.

1.3.5.4. Rotor. The rotor is mainly composed of the following parts:

1.3.5.4.1. Impeller. The impeller is of welded steel plate structure. The moving blade is wing twisted steel blade, which is connected with the blade handle by high-strength bolts and fixed on the impeller. When the fan is stopped, the installation angle of the moving blade can be adjusted, so that when the regulating door of the static regulating fan is fully opened, the fan efficiency is equal to that of the dynamic regulating fan. In order to improve the wear resistance of the moving blade, a solution welding cemented carbide wear-resistant layer is used on the surface of the moving blade.

1.3.5.4.2. Bearing housing. The main shaft and box supporting impeller rotation and torque transmission are of integral structure. One support bearing is installed at both ends of the main shaft: in order to bear the axial force of the fan, there is also a thrust bearing. The lubrication and cooling of the bearing relies on the oil pool in the bearing box and the external lubricating oil station: in order to reduce the impact of high-temperature flue gas on the bearing box, the fan is equipped with a special cooling fan for additional cooling of the bearing box and oil pipe.

1.3.5.4.3. Intermediate shaft. The rotor is connected with the driving motor through the rigid flexible coupling at the fan side and the motor side at both ends of the intermediate shaft.

1.3.5.4.4. Rigid flexible coupling. The main shaft of the fan is connected with the drive motor, and the installation error and thermal expansion error (radial, axial and angular errors of the two shafts) are compensated by elastic deformation of the diaphragm.

1.3.5.5. Diffuser. The function of diffuser is to change part of the dynamic pressure of impeller outlet flow into static pressure. For the convenience of maintenance, the diffuser is also provided with a manhole door.

1.3.5.6. Inlet and outlet expansion joints. The inlet of the inlet box and the outlet of the diffuser are connected with the pipe to compensate the thermal expansion of the fan and the pipe.

1.3.5.7. Cooling fan. In order to prevent the bearing from overheating, the cold air is introduced around the bearing box through the casing hollow guide vane, and the bearing box and oil pipe are additionally cooled.

1.3.6. Main accessories of RTF type axial fan with adjustable stationary blade. It generally includes driving motor, electric actuator, fan or motor supporting oil station, oil pipeline of fan bearing box, primary temperature measuring element of fan or motor main bearing, fan vibration measuring probe, anti surge device, cooling fan, sound insulation coating technology and materials.

1.4. Product series

1.4.1. Some product series of G-type meridional accelerated axial-flow induced draft fan and desulfurization booster fan (see table 8-1).

Table 8-1 partial product series of G type meridional accelerated axial flow induced draft fan and desulfurization booster fan

No. Unit capacity

(MW)
Model Flow  (m3/s) Pressure  (Pa) Temperature

()
Speed

(r/min)
Motor power

(kW)
Adjusting type
BMCR TB BMCR TB
1 4X300 G136/358 250.2 287.75 3492.4 4189 135 490 2000 Adjustable guide vane at stator inlet
2X300 G150/304 268 295 3465 4155 126.2 735 1550
4X300 G158/291 299.2 337.38 3729.6 4475.5 126 735 1900
2 2X330 G158/265 267.4 322.7 4905 5886 135.6 985 2350
3 2x350 G158/265 299.39 340.1 7048 8457.6 151 985 3700
2x350 G158/265 294.39 344.4 6258 7510 123 985 3300
4 2x600 G158/343 402.3 453.8 4523 5428 128 590 3300
2x600 G158/363 425.5 494.6 4130 5300 128 590 3200

 

1.4.2. Some product series of RTE axial-flow induced draft fan with adjustable stationary blade and desulfurization booster fan (see table 8-2).

Table 8-2 RIF static blade adjustable axial flow induced draft fan and desulfurization booster fan

No. Unit capacity

(MW)
Model Flow  (m3/s) Pressure  (Pa) Temperature

()
Speed

(r/min)
Motor power

(kW)
Adjusting type
BMCR TB BMCR TB
1 2x300 RTF33.5-17-1 496.7 556 2250 2700 127.3 745 1950 The inlet guide vane is adjustable; moving blade is adjustable while stop
 
2x300 RTF35.5-19-1 578.9 651.4 3250 3900 171.7 745 3150
2x300 RTF38.5-19-1 517.7 621.2 1900 2280 128.9 590 1800
2 2x330 RTF38.5-19-1 555.4 625.9 2010 2412 145 590 1950
3 2×350 RTF38.5-18-1 583.5 657.5 2447 2936 148 745 2450
4 2x600 RTF38.5-19-1 547 602 2150 2580 140 590 1950
5 2×1000 RTF38.5-181 664.7 731.1 2500 3000 127 745 2800
2x1000 RTF42-19-1 698 821 2225 2670 128 590 2800

 

2. Main technical parameters

SBW designed and manufactured according to the imported technology for power station G-type Meridional Acceleration axial-flow fan and RTF type static blade adjustable axial-flow fan have a wide range of technical parameters. The flow range is 30 -1500 m3/s, the pressure range is 900 - 21000 Pa, and the maximum temperature is 200 ℃. The technical parameters can cover the whole working range of the static blade adjustable fan for power station, and can meet the requirements of the oversize unit of 1500MW unit.

 

3. Equipment appearance and structure

3.1. G-type Meridional Acceleration axial flow fan

See Fig. 8-1 and table 8-3 for the shape and structural dimensions of G-type meridian acceleration axial flow fan, and see Figure 8-2 for its performance curve.

Table 8-3 structural dimensions of G series meridional accelerating stationary blade adjustable axial flow fan

Model 1 2 3 A*B L1 L2 L3 L4 L5 L6 H1 H2 H3
(mm) (mm) (mm) (mm*mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm)
G136/358 3580 3632 4522 2700×5500 1350 2710 4255 2000 0 1617 2810 2810 3000
G158/280 2800 1772 3734 2800x3950 1400 1820 3735 3900 20 1534 2190 2100 2240
G158/291 2910 1842 3876 2910×4107 1463 2027 3876 2500 25 1184 2000 210D 2310
G158/265 2650 1677 3655 2744×3872 1372 1878 3645 2400 0 1184 1900 1900 2170
G158/343 3430 2171 4570 3430×4842 1715 2565 4574 3420 25 1617 2700 2600 2724
G158/363 3630 2297 4849 3630×5124 1815 2765 4837 3630 25 1617 2800 2600 2885

3.2. RTF type axial fan with adjustable stationary blade

The external and structural dimensions of RTF type axial fan with adjustable stationary blade are shown in Fig. 8-3 and table 8-4.

Table 8-4 structural dimensions of RTF axial flow desulfurization booster fan with adjustable stationary blade

Model 1 2 3 A*B L1 L2 L3 L4 L5 L6 H1 H2 H3
(mm) (mm) (mm) (mm*mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm)
RTF33.5-17-1 3350 1678 4342 3150X4250 2630 2366 4355 3750 25 1250 2350 2500 2240
RTF35.5-19-1 3548 1884 4350 3550X4750 3100 2200 4500 3900 25 1250 2500 2350 2500
RTF38.5-18-1 3850 1778 4871 3750X5000 3500 2200 4855 4000 25 1250 2660 2800 2660
RTF38.5-19-1 3850 1884 4871 3750X5000 3500 2200 4855 4000 25 1250 2660 2800 2660
RTF42-19-1 4218 1884 5483 4180X5500 3700 2366 5483 4000 25 1250 2950 3080 2950

 

4. Selection method

SBW designed and manufactured according to the imported technology, G-type meridian accelerated logistics fan and RTF: adjustable stationary blade axial fan for power station have formed the characteristics of series design, standardized parts, complete varieties and specifications, and wide selection range. According to different parameters and requirements of customers, unit capacity and operation requirements, fans with advanced technical and economic indicators, different structure, model, series and size are formed. As the method of tailor-made, computer selection is adopted, so that most of the models given by users can quickly select the models of G-type meridian acceleration axial-flow fan or RTF-type static blade adjustable axial-flow fan according to modular matching It provides users with a wide range of choices in terms of technical performance and operation and maintenance price, so that the selected fan design operation point is in the high efficiency area of fan characteristic curve, which can meet the needs of users to the maximum extent, which not only adapts to the actual operating conditions, but also has better economy.

When selecting SBW's G type meridian acceleration axial fan and RTP static blade adjustable axial flow fan, users should provide relevant data information as follows:

4.1. Performance parameters of required fans

4.1.1. Users of fans.

4.1.2. The purpose of the fan.

4.1.3. Flow at the inlet of fan (m3/s).

4.1.4. Conveying medium temperature (℃).

4.1.5. Static pressure rise (Pa) from fan inlet end to fan exhaust end.

4.1.6. Fan inlet pressure (gauge pressure) (Pa),

4.1.7. Altitude (m) or local atmospheric pressure (Pa).

4.1.8. Allowable sound pressure level or allowable sound power level [dB (A)],

4.1.9. Medium transported by fan:

4.1.9.1. Gas type.

4.1.9.2. Gas density (kg/m3).

4.1.9.3. Dust content (mg /m3).

4.1.9.4. Dust characteristics (adhesive wear resistance),

4.1.9.5. Gas corrosion.

4.2. Other configuration requirements of fan

4.2.1. Layout of fans.

4.2.2. Adjustment mode of fan,

4.2.3. Power frequency (standard frequency) and voltage conditions provided.

4.2.4. Pressure, temperature and composition of water source provided.

4.2.5. Provide the highest and lowest ambient temperature of fan installation site all year round.

4.2.6. Preliminary configuration requirements or specifications of main accessories of fan.

4.2.7. Other special needs of customers.

 

5. Scope of supply and ordering instructions

5.1. Scope of supply: the basic scope of supply of axial flow fan and RTF fixed blade adjustable axial fan is shown in table 8-5.

Name Includings G type RTF type Remarks
Basic supply of main body Intake box (piece) 1 1  
Inlet guide vane adjustable device  (set) 1 1  
Intake cone piece) 1 __  
Shell (piece) 1 (With guide vane) 1  
Diffuser (piece) 1 1  
Rotor(impeller)(set) 1 1 (Adjustable blade in downtime)  
Main shaft (piece) 1 __  
Middle shaft (piece) __ 1  
Bearing house (set) 2 1 (Integral type)  
Middle shaft cover (piece) __ 1  
Rigid and flexible coupling (piece) 1 set 2 Double stage 01 type/03 type
Coupling cover (piece) 1 1  
Inlet expansion joint (piece) 1 1  
Outlet expansion joint (piece) 1 1  
Siege belt (piece) __ 3  
Bearing house oil system (set) 1 1  
Foot bolt connectings (set) 1 1  
Basic supporting facilities Motor (set) 1 1  
Lubrication oil station (set) __ 1 It depends on the specific configuration
Cooling water system (set) 1 __  
Cooling fan system (set) 1 1 It depends on the specific configuration
Electric actuator (set) 1 1 It depends on the specific configuration
Primary element (instrument), electric control instrument (set) 1 1 Fan control, bearing temperature, vibration monitoring and alarm
Surge alarm device (set) 1 1  
Muffler or sound insulation coating technology or material (set) __ __ It depends on the specific configuration
Basic spare parts Bearing __ __ It depends on the specific configuration
Sealings __ __ It depends on the specific configuration
Special tools Impeller disassembly tool (set) __ 1 It depends on the specific configuration
Torque wrench (set) 1 1  


5.2. Order requirements

SBW designed and manufactured according to the technology introduced by TLT company in Germany, G-type Meridional Acceleration axial-flow fan and RTF type static blade adjustable axial-flow fan are mainly used for boiler induced draft fan and booster fan of desulfurization and denitrification environmental protection device, G-type and RTF series products have common points in structure and performance, but they also have their own differences and differences. Customers must make clear the purpose of both the user and the manufacturer according to the product selection requirements, so as to ensure that the ordered products meet the actual use requirements and meet the matching of operating conditions, so as to achieve the expected operation efficiency, safety and reliability. Therefore, customers should pay attention to:

5.2.1. Provide the relevant data information to be understood in the inquiry sheet of wind turbine. See "4. Selection method" for details.

5.2.2. Provide fan layout (symmetrical or parallel).

5.2.3. Provide foundation conditions for fan installation (rigid foundation or flexible foundation)

5.2.4. Provide detailed technical data of self purchased parts (if the motor, electric actuator, etc. are matched by customers themselves).

5.2.5. When conveying corrosive, explosive and harmful medium gas to human body, it shall be indicated.

5.2.6. When selecting fans with non-standard structure and unconventional use, please inform the fan's working parameter requirements. The company will redesign or redesign the fan in an effective way to meet each customer's needs.

5.2.7. Provide control mode and monitoring content requirements for selected fans.

5.2.8. Provide the content requirements of sound insulation coating for fans (provide sound insulation coating technology or materials).

5.2.9. Provide ordering opinions of spare parts and imported accessories.

5.2.10. Provide delivery date, place of delivery and mode of transportation.

5.2.11. For export products, the language used in the data and documents and the mode of acceptance and delivery shall be specified.