Axial fan with adjustable moving blades

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.