6-51-22#Centrifugal fan

G5-51, Y5-51 No. 8-29.5D boiler centrifugal blower and the air compressors
1, the use of G5-51, Y5-51 type boiler feed fan, applicable to the thermal power plant in the 2 ~ 670t/h steam boiler air supply system, but also to meet the requirements of the high pressure head of the performance parameters of the fluidized bed furnace. The series fans can also be used for dust removal, mine ventilation and general ventilation systems.
The air is delivered by the fan, and the gas is transferred by the draught fan to the flue gas or impurity containing particles. When the impurity depth is less than 200mg/m3, it can be used for more than 4 years. Such as impurities can also be used, but the service life will be shortened. The maximum operating temperature of the delivery and draught fan shall not exceed 250 DEG C.
2, form
1) the air blower, the induced draft mechanism into a single suction form. Machine number No. 8 ~ 29.5 of the 20 machine No. 40 specifications.
2) each fan can be made into two forms of left or right rotation.
3) fan outlet position, the outlet angle of the chassis.
4) the transmission mode of fan is D (i.e. cantilever structure), and the motor and fan are connected by elastic coupling.
5) the full name of the product is as follows:
G5-51-1 No. 18D 90 degrees to the right
Y5-51-1 no 18D left 0 degrees
Including: G, Y boiler blower and boiler fan respectively, 5 is the highest efficiency point of the pressure coefficient of 10 times of the whole, 51 specific speed, 1 for the first time, said the No. 18 impeller diameter 1800mm.
3, structural characteristics
1) this series fan uses the high strength wear-resisting impeller, oil sealing bearing box, joint axial adjusting door and other advanced proprietary technology achievements.
2) a wide range of high efficiency, the fan number is arranged closely, easy to select the efficient operating point.
3) adjustable air inlet. That is, when the fan is installed, the air inlet and the axial and radial clearance of the impeller are adjusted.
4) high strength wear-resistant impeller. The impeller adopts the backward single blade, which can reduce the impact of the air flow, the stability is good, the motor is not easy to overload, and the service life of the blower is prolonged. The utility model has the advantages of high pressure coefficient, low cycle speed and low noise.
5) the oil leak bearing box. The lapping type oil ring the high-speed rotation of the bearing with the inner wall of the bearing box oil left to flow back into the oil tank; semi open aluminum seal in addition to convenient maintenance and to prevent friction accidents, can increase the resistance along the axial part of thin oil cut back to oil tank; lateral pressure packing will dilute oil amount in the bearing box; the upper part is provided with a ventilation plug to reduce the micro positive pressure bearing box, ensure no leakage, good dustproof performance.
(6) joint axial adjusting door. A joint bearing is arranged at the pivot point and the regulating rod of the adjusting door, and no dead point is arranged in the running and the regulating process, thus the adjustment is flexible and labor-saving, the installation is reliable, and the actuating mechanism is not overloaded.
7. The fan is a whole or split assembly type. The drive coupling group, fans of the series 16D under the hood, the motor factory assembled in a complete base; casing, air inlet and adjust the door to another component, small type fan factory assembled into two components, assemble and disassemble larger sizes for multiple components, in order to transport and installation.
8. The fan is a cantilever structure, the arrangement is convenient, the motor is directly connected with the transmission, and the torque is transmitted uniformly.
9. The fan is easy to install and maintain. This fan has two parts of the base machine transmission eon and complete set of a split or vertical surface, and particularly convenient, the rotor can be lifted vertically, if only the replacement of the impeller can be disassembled axially.
4, performance and selection
1) fan performance. The performance of the fan is expressed in terms of fan flow, total pressure, spindle speed, shaft power and efficiency. The performance of the selected curves and performance tables. Blower performance: t=20 C, Pa=101325Pa, atmospheric pressure gas density = 1.2kg/m3 air medium calculation.
The performance of fan according to the calculation of gas temperature t=200, atmospheric pressure, Pa=101325Pa gas density = air medium at 0.745kg/m3.
The performance of the calibration curve and the performance table is that the performance of the blade is 0 degrees. The order shall be subject to performance. The deviation of the full pressure value of the fan performance test shall not exceed 5% of the design pressure value.
When the machine is not in accordance with the above conditions, the performance should be converted according to the relevant formula.
Treatment of excessive or insufficient flow. When in use, often excessive flow or insufficient phenomenon, there are many reasons for this phenomenon, if it is in the use of the process to produce this phenomenon, mainly due to the resistance of the pipe network is large and small. If it is in the process of use, after a long period of gradual reduction, or a sudden decrease in a short period of time, mainly due to network congestion.
In the new installation of the fan, the official operation of the flow should be excessive or insufficient phenomenon mainly due to the following points:
EQ (\o\ac, 1, 1) the actual pipe resistance value and calculated value is too large.
From the general pipe network characteristic equation: P = Kq2, formula K - resistance coefficient.
If the actual value of K is less than the calculated value of K, the flow increases, if the actual value of K is greater than the calculated value of K, the flow decreases.
EQ (\o\ac, 2, 2) when the choice is not considered fan full pressure effect of deviation of a P, when the actual fan full pressure is positive deviation, then the flow is increased; the negative deviation, then the flow is reduced.
When the fan is installed after the new installation, or in the course of the use of excessive or excessive flow, one of the following methods can be used to eliminate:
A, adjust the opening and closing of the gate to regulate the flow.
B, the use of fan speed adjustment flow.
C, the use of the replacement of new high pressure or low pressure fan to increase or decrease the flow.
D, change the pipe network resistance coefficient K to change the flow.

When the door is fully open, the flow is too small. Can now

6-51-22#Centrifugal fan

Machine No.	speed /(r/min)	Total pressure /Pa	flow /(m3/h)	Internal efficiency （%）	Internal efficiency /KW	Shaft power /KW	what is needed power /KW	Motor		coupling			Rolling bearing model
								Model	power /KW	Model or Code	Fan shaft size /mm	Motor Shaft size /mm
8D	1450	2525	9900	73	9.5	9.7	12	Y160L-4 380V	4	5-65×42	65×140	42×110	3616
		2524	12100	79	10.7	11	13
		2435	14300	82	11.8	12	14
		2346	16500	84	12.8	13.1	15	Y180M-4	18.5	5-65×48		48×110
		2169	18700	82	13.7	14	16
		1992	20900	79	14.6	14.9	17
		1771	23100	74	15.4	15.7	18
9D	1450	3195	14100	73	17.1	17.5	20	Y200L-4 380V	30	5-65×55	65×140	55×110	3616
		3194	17200	79	19.3	19.7	23
		3081	21200	82	21.2	21.6	25
		2969	23500	84	23.1	23.5	27	Y225S-4 380V	37	5-65×60		60×140
		2745	26600	82	24.7	25.2	29
		2522	29700	79	26.3	26.9	31
		2241	33000	74	27.8	28.3	33
10D	1450	3944	19300	73	29	29.6	34	Y225M-4 380V	45	5-65×60	65×140	60×140	3616
		3943	23600	79	32.7	33.4	39
		3804	27900	82	36	36.7	43
		3666	32200	84	39	40	46	Y250M-4 380V	55	5-65×65		65×140
		3389	36500	82	42	43	50
		3113	40800	79	45	46	53
		2767	45100	74	47	48	55
11D	1450	4772	25700	73	47	48	55	Y280S-4 380V	75	6-65×75	75×140	75×140	3620
		4771	31400	79	53	54	62
		4603	37100	82	58	59	68
		4436	42900	84	63	64	74	Y280M-4 380V	90
		4101	48600	82	68	69	80
		3767	54300	79	72	73	85
		3348	60000	74	76	77	89