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Axial fan with adjustable moving blades

key word:Heat exchange element

Category:


Product description

Axial fan with adjustable blades

 

1. Introduction

1.1.  Application

It is mainly used in large power plant boiler flue gas and pulverized coal preparation system and desulfurization and denitrification environmental protection device.

1.2. Model meaning

SAF28-16-1

S -- application (S-boiler induced draft fan; F-boiler forced draft fan; P-boiler primary fan; R-desulfurization fan)

A -- axial flow

F ------ adjustable blade

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

16 -- roundness value of hub diameter (dm)

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

1.3. Structural features and principles

The movable blade adjustable axial-flow forced draft fan (see Figure 1-1), primary air fan (see Figure 7-2), induced draft fan (see Figure 7-3) and desulfurization and denitrification fan (see Figure 7-4) of SBW large-scale power station are imported from Germany TLT technology design and manufacture, the installation angle of the fan blade can be adjusted synchronously by using the electric actuator remote control hydraulic regulating device under the operation state, so that the fan flow and air pressure can always match the system working condition, and the flow variation range is large, the high efficiency operation area is wide, especially for the large capacity variable working condition units above 600MW, the movable blade adjustable axial flow fan is often used After using the axial flow fan with adjustable hydraulic moving blade, the energy saving effect is remarkable and the operation cost is reduced. After more than 20 years of design and manufacture and accumulation of a large number of practical operation experience data of large-scale movable blade adjustable axial-flow fan for SBW power station, a series of mature products that can cover and meet the performance parameters of all thermal power units below 1000MW have been formed.

1.3.1. The basic structure of axial flow fan with adjustable moving blade:

1.3.1.1. Direction of rotation. Viewed from the motor end (i.e. in the direction of air flow), the fan impeller rotates anticlockwise. When there are two fans for one steel furnace, 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 intermediate shaft and rigid flexible coupling.

1.3.1.5. Support mode. The main bearing box of the fan with rotor is fixed on the flange seat of the inner cylinder of the casing by flange with bolts: the motor, fan inlet box, casing and diffuser are all fixed on the concrete foundation with anchor bolts,

1.3.1.6. Adjustment mode. During the operation of the fan, the installation angle of the moving blade is adjusted by the electric actuator and the hydraulic regulating device installed on the rotor, so as to change the flow and pressure of the fan and match with the working condition of the system.

1.3.1.7. Forms of environmental protection measures. The forced draft fan and primary air fan can be matched with the muffler (horizontal or vertical) designed and manufactured by SBW according to the imported branch technology. The sound insulation and coating technology provided by SBW can be used for the induced draft fan and desulfurization and denitrification fan, and the on-site sound insulation and heat insulation construction of the wind turbine body can be carried out.

1.3.2. Main parts of axial flow fan with adjustable moving blade. The overall structure of the axial-flow fan with adjustable moving blades is mainly composed of rotating parts (rotor), stationary parts (casing, etc.) and measurement and control noise elimination accessories. The forms of axial flow fans with adjustable hydraulic moving blades for different purposes are shown in Fig. 7-1 ~ Fig. 7-4.

1.3.2.1. Rotating parts: including rotor (bearing box), intermediate shaft, coupling, etc.

1.3.2.1.1. The rotor is mainly composed of impeller with blade and petiole system, hydraulic regulating device and bearing box. The impeller is a welded structure of steel plate and some forgings, and its strength and rigidity is better than that of the casting structure, and the processing and inspection technology is mature; the centrifugal force of the assembly parts such as the blade and the petiole is transferred to the impeller support ring with smaller diameter, which makes the weight of the impeller lighter and the moment of inertia smaller. The impeller cantilever is installed on the shaft end of the bearing box. Impeller and spindle interference fit, with the help of special hydraulic assembly and disassembly tools, very convenient. The fitting surface of impeller and shaft will not be damaged. The impeller shall be dynamically balanced three times before delivery.

The moving blade is a twisted wing blade with good aerodynamic performance. After strength and vibration calculation, the blade can operate safely.

Forced draft fan and primary fan moving blades are made of high-strength cast aluminum alloy by vacuum differential pressure casting. After dissecting the blades, test bars are taken for mechanical property inspection, internal quality inspection and surface flaw detection inspection of blades are conducted to ensure the quality of blades.

The moving blades of induced draft fan and desulfurization and denitrification fan are made of high strength low alloy steel. In order to improve the wear resistance of the moving blade, the cemented carbide wear-resistant layer is welded on the working face of the moving blade, and the corrosion resistance measures should be taken for the flue gas with strong corrosion resistance.

The moving blades are tested for mechanical properties of materials and nondestructive testing of blades to ensure the safe operation of fans. The moving blade is fixed on the blade handle in the impeller with special high strength bolts, and the blade handle is equipped with thrust bearing and guide bearing. The petiole is connected with the hydraulic adjusting device through adjusting rod, slide block and adjusting ring, and the hydraulic adjusting device is fixed in the support body of the impeller. Its structural arrangement makes the reaction force of the hydraulic cylinder thrust required for adjusting the blade be borne by the impeller.

The balance weight is arranged on the petiole to balance the restoring torque generated by the blades in running state, thereby reducing the adjustment force needed to adjust the moving blades in operation.

The hydraulic moving blade regulating system is composed of hydraulic regulating device and electric actuator. There is a feedback mechanism in the hydraulic regulating device. When the fan is running, the installation angle of the moving blade can be adjusted conveniently, flexibly and reliably through the system of electric actuator and hydraulic regulating device, and the adjustment is stable without drift. The operating torque of the hydraulic blade adjusting device is small, only 30-50nm. The 100nm electric actuator is used, which is flexible and convenient to adjust.

The bearing box is of integral type. The main shaft and the configured bearing are placed in the bearing box, so the design structure is compact. The bearing box is connected with the lower half flange of the inner cylinder of the casing through a flange, and the upper half is pressed by the flange of the inner cylinder of the casing to keep the axis of the casing and the main shaft consistent. The integral bearing box and its fixing method are convenient for installation, maintenance and disassembly, without readjustment, and can always ensure that the impeller and the casing are concentric. The main shaft of bearing box is installed with impeller at one end and coupling at the other end, which is connected with drive motor through intermediate shaft and coupling. The bearing box is equipped with supporting bearing and thrust bearing. The shaft seal is fluororubber framework seal to prevent oil leakage. The bearing adopts oil pool and forced circulation lubrication and cooling.

1.3.2.1.2. Intermediate shaft. Hollow transmission shaft is connected with rigid flexible coupling by high strength bolts through flange at both ends.

1.3.2.1.3. Coupling. The rigid flexible coupling compensates the radial, axial and angular deviations of two adjacent shafts due to installation and thermal expansion through the elastic deformation of diaphragm; it does not need lubrication and maintenance.

1.3.2.2. Stationary parts. The stationary parts include air inlet box, casing, diffuser, protective device and flexible connector.

1.3.2.2.1. Air inlet box, steel plate welding structure, with access door and drain pipe at the bottom. An arc-shaped structure is designed below the center line of the inlet box to reduce the intake loss of the fan and correspondingly reduce the pulsation of the air flow, which is conducive to improving the efficiency of the fan.

1.3.2.2.2. The casing and fan casing are of welded steel plate structure. The casing has a horizontal split. The winding shroud seal before and after removal is removed. The upper part can be disassembled to facilitate the assembly, disassembly and maintenance of the impeller. There are steel footings at the bottom of the casing, and the independent leveling screws are arranged at the bottom of the casing, which is convenient for installation and adjustment. The casing is fixed on the foundation with embedded anchor bolt box, and the anchor bolts are grouted twice, which is convenient for field installation and adjustment. The whole shell is assembled in the factory, and the whole machine is delivered after commissioning. Blade angle pointer and dial are set outside the casing, which is intuitive and convenient for field observation.

1.3.2.2.3. Diffuser. The diffuser is a welded steel plate structure, which is installed on the exhaust side of the fan casing

1.3.2.2.4. Protective devices. An intermediate shaft shield is arranged outside the intermediate shaft in the air inlet box to separate the intermediate shaft from the air flow and maintain the air flow stability of the air inlet box. The half coupling on one side of the motor is protected by coupling guard.

1.3.2.2.5. Flexible connectors. Flexible connector mainly includes inlet and outlet expansion joint and shroud. Flexible inlet and outlet expansion joints can compensate for thermal expansion and installation errors of inlet and outlet pipes, and isolate vibration transmission. The casing is connected with the air inlet box and the diffuser with a shroud. The shroud is composed of flexible sealing belt and steel belt, which is convenient for assembly and disassembly, maintenance and isolation of vibration transmission.

1.3.2.3. Measurement and control noise elimination kit. Measurement and control noise elimination accessories include drive motor, electric actuator, fan / motor oil station, hydraulic lubricating oil station and oil pipeline device, fan surge alarm device, fan main bearing temperature measurement device, fan vibration measuring probe, muffler and sound insulation coating technology or materials.

 

2. Main technical parameters

2.1. Technical specifications of FAF axial flow blower with adjustable blades (see table 7-1)

Table 7-1 technical parameters of FAF axial flow blower with adjustable moving blade

No. Unit capacity

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

()
Speed

(r/min)
Motor power

(kW)
BMCR TB BMCR TB
1 330 FAF18-9.5-1 108.8 117 3729 4469 20 1480 630
FAF18-10.6-1 110 121 4760 5234 26 1490 800
FAF19-9.5-1 107 123 3766 4754 20 1470 800
FAF19-10-1 122 138.8 4462 4921 27 1490 900
FAF20-9.5-1 134 140.7 3423 3935 30 1470 800
FAF20-10-1 154 167 3900 4290 26 1490 950
FAF22.4-16-1 117.7 125 3766 4193 45 985 1000
2 350 FAF19-9-1 117.9 128.9 3376 4050 24 1470 630
FAF19-10-1 130,7 151 4410 5292 35 1490 1000
FAF19-10.6-1 132.6 143.8 4891 5380 20 1490 950
3 600 FAF20-10-1 146.2 155 3586 3945 25 1470 800
FAF20.4-10-1 185.8 205.4 4109 4732 30 1490 1250
FAF25-12.5-1 208.1 247.4 3322 4337 38 990 1400
FAF25-14-1 198.8 219.4 4581 5046 23 985 1400
FAF26.6-12.5-1 205 249.3 3150 4276 22.6 985 1450
FAF26.6-13.3-1 202.75 229.88 3270 3929 29 985 1120
FAF26.6-14-1 246.6 259 4519 4971 20 990 1550
FAF 26.6-15-1 225.6 250.2 4399 5060 35 985 1500
FAF26.6-17-1 247 265 5811 6394 27 985 2000
FAF28-15-1 259.3 280.6 3773 4154 28 990 1400
FAF28-16-1 271 308.3 4695 5643 16.2 985 2000
4 660 FAP25-14-1 212.96 250.5 4377 5050 38 990 1550
FAF26.6-12.5-1 239.3 260.7 3338 3842 31 985 1200
FAF26.6-13.3-1 274 301 3887 4569 23 990 1600
FAF26.6-14-1 255.69 282.74 4011 4699 20 985 1700
FAF26.6-15-1 283.07 285.02 4208 5053 27 985 1800
5 1000 FAF26.6-13.3-1 310 392.8 4074 5296 38.4 990 2600
FAF26.6-14-1 296.5 339.2 4940 5934 27 990 2400
FAF28-13.3-1 330.7 400 4654 5610 22.6 985 2800
FAF28-14-1 323.3 397 4201 5475 32 990 2600
6 1030 PAF28-14-1 326.8 387.6 3940 5122 38 990 2450

 

2.2. Technical parameters of PAF axial flow primary air fan with adjustable moving blade (see table 7-2)

Table 7-2 technical parameters of PAF axial flow primary air fan with adjustable moving blade

No. Unit capacity

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

()
Speed

(r/min)
Motor power

(kW)
BMCR TB BMCR TB
1 300 PAF13.8-8-2 39.7 41.1 5488 5684 20 1493 550
PAF15.3-11.8-2 42.24 59.13 10473 13999 26 1470 1000
PAF16-11.8-2 43.02 61.09 10639 12984 20 1490 1250
PAF17-12.5-2 62.5 84.37 12070 15690 26 1470 1600
2 600 PAF17-11.8-2 54.72 79.3 8402 11808 16.2 1470 1120
PAF18-11.8-2 76.6 124 11255 16018 22.6 1470 2550
PAF18-12.5-2 67.9 113.9 10219 13379 38 1470 1900
PAF18-13.3-2 64.41 94.63 13466 17447 26 1470 2000
PAF18.5-13.3-2 86.24 120.23 13267 17274 30 1490 2500
PAF19-11.8-2 74.65 111.64 8721 11394 20 1470 1700
PAF19-12.5-2 84.21 125.14 10024 13089 38 1470 1950
PAF19-13.3-2 94.8 128.8 12072 15736 30 1490 2450
PAF19-14-2 76.72 106.9 11710 15246 28 1470 2100
PAF19-14.4-2 84.36 113.9 14023 18229 28 1490 2560
PAF20-14-2 112 173.1 13153 17158 28 1470 3380
PAF21.1-13.3-2 148 241.3 14599 19027 30 1490 4800
PAF22.4-13.9-2 173.19 242.48 12603 17055 23 1490 5100
3 660 PAF18-11.8-2 82.4 115.4 11163 14369 31 1490 2050
PAF18.2-12.5-2 82.42 117.62 11013 14682 30 1490 2100
PAF19-14-2 92.61 123.38 16259 21172 27 1490 3200
PAF19-14.4-2 84.36 113.9 14023 18229 28 1490 2550
660 PAF19.5-13.5-2 135.14 129.33 14792 14779 38.4 1490 2350
PAF19.5-15-2 84.73 118.35 16193 21098 25.3 1490 2900
PAF20.8-13.3-2 142.5 204 17989 13801 26 1490 4450
4 1000 PAF19.6-14.6-2 99.1 145.7 16350 21255 34.7 1470 3600
PAF20-12.5-2 116.4 168.5 12845 17386 22.6 1490 3500
PAF20-13.3-2 117 169.6 14872 19384 30 1490 3950
PAF20.5-14-2 117.4 173.6 14176 18429 38.4 1490 3800
PAF21.1-15-2 113.64 164.17 16390 22000 31.3 1490 4200
5 1030 PAF20.5-14-2 115.06 173.66 14713 19127 38 1490 4000

 

2.3. Technical parameters of SAF type axial flow induced draft fan with adjustable moving blade (see table 7-3)

Table 7-3 technical parameters of SAF type axial flow induced draft fan with adjustable moving blade

No. Unit capacity

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

()
Speed

(r/min)
Motor power

(kW)
BMCR TB BMCR TB
1 330 SAF30-20-1 298.7 343.51 5041 6301 129.8 985 2350
SAF30.5-21.1-1 329.14 370.65 6514 7820 158 990 3500
2 350 SAF28-19-1 226.22 263.61 4872 6334 72 985 2000
3 600 SAF28-19-1 249.7 287.2 4546 5639 121.6 985 1950
SAF30-20-1 308.72 347.42 4571 5507 131.4 985 2500
SAF31.5-18-1 439.69 518.2 5903 7028 138.1 990 4500
SAF35.5-20-1 435.04 515.6 4155 5110 142 735 3100
4 660 SAF37.5-22.4-1 485.81 540.83 4569 5940 120.6 735 3850
5 1000 SAF40-19-2 659 801 6500 8270 132 745 7800

 

2.4. Technical parameters of RAF type axial flow desulfurization and denitrification booster fan with adjustable moving blade (see table 7-4)

Table 7-4 technical parameters of RAF axial flow desulfurization and denitrification booster fan with adjustable moving blade

No. Unit capacity

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

()
Speed

(r/min)
Motor power

(kW)
BMCR TB BMCR TB
1 310 RAF35.5-18-1 544 613 2850 3420 153 745 2600
2 320 RAF35.5-18-1 581.56 610.64 3150 3465 140 745 2600
3 362.5 RAF40-19-1 561.54 617 2100 2520 145 590 1850
4 500 RAF46.5-21.1-1 899 1012 2100 2520 168 590 3100
RAF47.5-20-1 900.3 1051.3 1930 2316 132 590 2900
5 600 RAF35.5-20-1 506.07 556.67 3083 3700 126 735 2500
RAF40-19-1 786 806 3480 4176 133 735 4100
RAF42-20-1 1185 1335 3210 3850 145 735 6300
RAF44-21.1-1 812.23 916.54 2750 3300 124 590 3800
RAF45-22.4-1 847.33 957.17 3140 3760 129.7 590 4250
RAF45.5-20-1 835.75 942.55 2300 2800 133 590 3200
RAF46.5-21.1-1 990 1116.4 2800 3360 130.6 590 4800
RAF46.5-23.7-1 932.56 1051.9 3200 3840 130 590 4800
RAF47.5-20-1 856.62 964.92 1800 2160 125 590 2600
RAF47.5-22.4-1 862.04 948.25 2111 2812 122.2 490 3000
RAF47.5-23.7-1 972.08 1100 3008 3610 121 580 5000
RAF47.5-25-1 1060 1196 3400 4080 135.4 590 5900
RAF48.5-22-1 996 1125 2000 2400 127.5 590 3500
RAF48.5-23.7-1 1144 1269 3210 3852 135 590 6300
RAF48.7-25-1 1185 1335 3210 3850 145 590 6300
RAF52-23.7-1 1111 1222.1 2000 2400 145 490 3600
6 660 RAF46.5-23.7-1 940.3 1034 3660 4400 133 590 5600
RAF47.5-20-1 935 1054.3 2600 3100 136.3 590 4000
RAF52-23.7-1 1179.4 1326.2 2100 2520 131 490 4000
7 680 RAF47.5-22.4-1 3200 1092.3 968.2 3840 128 590 5100
8 1000 RAF37.5-19-1 2995 697.85 618.78 3594 133 745 3300
RAF40-18-1 2300 707 627 2760 122 740 2350
RAF40-19-1 2434 748 626.78 2880 133 590 2500
RAF42-19-1 2225 749.83 665 2670 122 580 2500

 

3. Equipment outline and structural dimensions (part)

3.1. FAF axial flow blower with adjustable moving blade

The outline and structural dimensions of FAF type axial flow forced draft fan with adjustable moving blade are shown in Fig. 7-1 and table 7-5.

Table 7-5 structural dimensions of FAF axial flow forced draft fan with adjustable moving blade

Model 1 2 3 A*B L1 L2 L3 L4 L5 H1 H2 H3
(mm) (mm) (mm) (mm*mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm)
FAF18-10.6-1 1778 1060 2305 1700X2210 1500 2070 3010 1800 20 1180 1400 1180
FAF19-10-1 1884 1000 2442 1800X2370 1550 2070 3190 1900 20 1250 1420 1250
FAF20-10-1 1996 1000 2587 1900X2500 1620 2070 3260 2000 20 1330 1520 1330
FAF22.4-16-1 2238 1584 2901 2120X2800 1800 2460 3790 2180 20 1500 1600 1500
FAF25-17-1 2512 1678 3256 2370X3150 2020 2300 3866 2530 20 1700 1750 1700
FAF26.6-15-1 2660 1496 3448 2500X3350 2163 2580 3458 2600 20 1800 1900 1800
FAF28-12.5-1 2818 1258 3653 2660X3550 2270 2540 4770 2800 20 1900 2050 1900

 

3.2. PAF movable blade adjustable axial flow primary air fan

The shape and structural dimensions of PAF axial flow primary air fan with adjustable moving blade are shown in Fig. 7-2 and table 7-6.

Table 7-6 structural dimensions of PAF axial flow primary air fan with adjustable moving blade

Model 1 2 3 A*B L1 L2 L3 L4 L5 H1 H2 H3
(mm) (mm) (mm) (mm*mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm)
PAF13.3-8-2 1337 796 1792 1250X1700 1300 1890 2258 1400 20 900 1000 900
PAF15.3-11.8-2 1530 1188 2053 1400X1900 1500 2100 2059 1600 20 1060 1200 1060
PAF16-11.8-2 1584 1188 2053 1500X2000 1500 2100 2059 1600 20 1000 1200 1060
PAF17-12.5-2 1678 1258 2175 1600X2120 1600 2100 2840 1640 20 1120 1270 1120
PAF18-13.3-2 1778 1334 2305 1700X2240 1740 2460 3010 1800 20 1180 1320 1180
PAF19-13.3-2 1884 1334 2442 1800X2370 1740 2900 3190 1840 20 1250 1600 1250
PAF20.8-13.3-2 2080 1334 2740 2000X2660 2250 3000 3578 2240 20 1400 1600 1400
PAF21.1-15-2 2114 1496 2740 2000X2660 2250 3000 3578 2240 20 1400 1600 1400
PAF22.4-13.9-2 2238 1390 2901 2120X2800 2000 2900 2910 2150 20 1500 1700 1500

 

3.3. SAF type axial flow induced draft fan with adjustable moving blade

See Fig. 7-3 and table 7-7 for the shape and structural dimensions of SAF type axial-flow induced draft fan with adjustable moving blade

Table 7-7 structural dimensions of SAF type axial flow induced draft fan with adjustable moving blade

Model 1 2 3 A*B L1 L2 L3 L4 L5 H1 H2 H3
(mm) (mm) (mm) (mm*mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm)
SAF28-19-1 2818 1884 3653 2660X3550 2280 2894 3665 2800 25 1650 1960 1900
SAF30-20-1 2986 1996 3870 2800X3750 2320 3100 3500 3000 25 1995 2125 1995
SAF31.5-18-1 3162 1778 4098 3000X4000 2600 3350 4111 3000 25 2120 2250 2120
SAF35.5-20-1 3546 1996 4600 3350X4500 2800 3500 4500 3400 25 2270 2450 2370
SAF37.5-22.4-1 3758 2238 4871 3550X4750 2900 3700 4858 3700 25 2600 2900 2500
SAF40-19-2 3982 1884 5161 3750X5000 3500 4000 5117 3900 25 2660 2700 2660

 

3.4 RAF type denitrification fan with adjustable blades

The shape and structural dimensions of RAF axial-flow desulfurization and denitrification booster fan with adjustable moving blade are shown in Fig. 7-4 and table 7-8.

Table 7-8 structural dimensions of RAF type axial flow desulfurization and denitrification booster fan with adjustable moving blade

Model 1 2 3 A*B L1 L2 L3 L4 L5 H1 H2 H3
(mm) (mm) (mm) (mm*mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm)
RAF31.5-16-1 3162 1584 4098 3000X4000 2900 2800 5240 3982 25 2500 2800 2500
RAF35.5-18-1 3548 1778 4600 3350X4500 2800 3200 4500 3400 25 2370 2550 2370
RAF40-19-1 3982 1884 5161 3750X5000 3030 3185 5180 3982 25 2725 2790 2670
RAF42-20-1 4218 1996 5467 4000X5300 3400 3800 5483 4200 25 2800 2470 2800
RAF44-21.1-1 4400 2114 5726 4180X5500 3350 3275 5720 4400 25 2580 3080 2950
RAF45-22.4-1 4466 2238 5790 4250X5600 4000 3800 5806 4400 25 2700 3200 3000
RAF46.5-21.1-1 4650 2114 6135 4500X6000 4400 4000 6150 4700 25 3150 2800 3150
RAF47.5-25-1 4732 2372 6135 4500X6000 4200 3800 6150 4700 25 3150 3400 3150
RAF48.5-23.7-1 4850 2372 6287 4605X6126 4400 3800 6305 4700 30 3500 3400 3235
RAF52-23.7-1 5200 2372 6880 5000X6700 4610 3800 6900 4700 30 3500 3700 3480

 

4. Selection method

SBW designed and manufactured according to the technology of TLT company in Germany. The FAF type movable blade adjustable axial-flow forced draft fan, PAF movable blade adjustable axial-flow primary air fan, saf movable blade adjustable axial-flow induced draft fan and RAF movable blade adjustable axial-flow desulfurization and denitrification fan for power station have formed the characteristics of series design, standardization of parts and components, complete varieties and specifications, and wide selection range. Due to the large power of large-scale fan, it is of great significance to improve the technical and economic efficiency of the fan. Therefore, the selection method is to determine the specific model of the fan and relevant parameters such as fan speed, efficiency and shaft power according to different parameters and requirements of customers, so as to achieve the best matching of fan and boiler operation conditions, and ensure the high efficiency and energy saving of operation conditions 。

When selecting various types of hydraulic adjustable blade axial-flow fans of SBW, users hope to 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. Total pressure rise (fan total pressure) or fan static pressure from fan inlet end to fan exhaust end.

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

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.

4.1.9.3. Dust content of gas.

4.1.9.4. Dust characteristics (adhesion / abrasion).

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.

When customers put forward special requirements for hydraulic adjustable blade axial-flow fans (new units, retrofit units, expansion units, etc.), they can make selection and inquiry from Shanggu company according to specific requirements.

4.3. Performance curve of power station fan (see Figure 7-5)

When customers put forward special requirements for hydraulic adjustable blade axial-flow fans (new units, retrofit units, expansion units, etc.), they can make selection and inquiry from SBW according to specific requirements.

 

5. Scope of supply and ordering instructions

5.1. Scope of supply

See table 7-9 for the basic supply scope of axial flow fan with adjustable blades

Table 7-9 basic supply scope of axial flow fan with adjustable blades

Name Includings FAF type PAF type SAF type RAF type Remarks
Basic supply of main body Intake box (piece) 1 1 1 1  
Hydraulic adjusting device (set) 1 1 1 1  
Shell (piece) 1 1 1 1  
Diffuser (piece) 1 1 1 1  
Basic supply Rotor(impeller)(set) Single stage / double stages Double stages Single stage / double stages Single stage / double stages  
Middle shaft (piece) 1 1 1 1  
Bearing house (piece) 1 1 1 1  
Middle shaft cover (piece) 1 1 1 1  
Rigid and flexible coupling (piece) 2 2 2 2 Double stage 01 type/03 type
Coupling cover (piece) 1 1 1 1  
Inlet expansion joint (piece) 1 1 1 1  
Outlet expansion joint (piece) 1 1 1 1  
Siege belt  (piece) 2 2 2 2  
Bearing house oil system (set) 1 1 1 1  
Foot bolt connectings (set) 1 1 1 1  
Basic supporting facilities Motor (set) 1 1 1 1  
Lubrication oil station (set) 1 1 1 1 It depends on the specific configuration
Cooling fan system (set) 1 1 1 1 It depends on the specific configuration
Electric actuator (set) 1 1 1 1 It depends on the specific configuration
Primary element (instrument), electric control instrument (set) 1 1 1 1 Fan control, bearing temperature, vibration monitoring and alarm
Surge alarm device (set) 1 1 1 1  
Muffler or sound insulation coating technology or material (set) Muffler Muffler Sound insulation coating technology or material Sound insulation coating technology or material It depends on the specific configuration
Basic spare parts Bearing It depends on the specific configuration
Sealings It depends on the specific configuration
Blade It depends on the specific configuration
Blade bolts It depends on the specific configuration
Special tools Impeller disassembly tool (set) 1 1 1 1 It depends on the specific configuration
Torque wrench (set) 1 1 1 1  

 

5.2. Order requirements

The FAF, PAF, saf axial-flow fans and RAF booster fans for desulfurization and denitrification environmental protection devices are designed and manufactured by SBW according to the technology introduced by TLT company of Germany. Each series of products have common points in structure and performance, but there are also differences and differences between them. Customers must make clear the purpose of the selection of products through ordering requirements, so that both the user and the manufacturer can make clear the purpose to ensure the order selection The purchased products meet the requirements of actual use, and meet the matching of operating conditions, so as to achieve the expected operation efficiency and safe and reliable guarantee. For this reason, the specific requirements of customers are as follows:

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, delivery place and transportation mode.

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