Use of fan
G4-73 and Y4-73 type boiler pass and draft fan are mainly used in the 2 - 670t/h steam boiler in the thermal power plant. In the absence of other special requirements, G4-73 can also be used in mine ventilation and general ventilation.
The medium of the fan is air, the maximum temperature shall not exceed 80 DEG C; the medium of the induced draft fan is the flue gas, the maximum temperature shall not exceed 250 DEG C.
Before the draft fan, dust removal device must be installed in order to reduce the dust content of the flue gas. According to the general use of power plants, with the dust collector efficiency shall not be less than 85%.
Fan type
1, fan and fan are made of single suction, the No. 8 - 29.5 a total of 13 machine no..
2, from one end of the motor face, the clockwise rotation of the impeller, said the right cyclone, to "right", and vice versa for the left cyclone, to "left".
3, the outlet position of the fan, the angle of the outlet angle.
4, the transmission mode of the fan is D, the use of elastic coupling.
Fan structure
The fan is mainly composed of impeller, casing, air inlet, adjusting door and transmission parts.
1, the impeller - 12 wing shaped blades welded on the oblique cone curved front plate and flat plate. Due to the adoption of wing shaped blades, the main efficiency, low noise and high strength of the fan are ensured. The static and dynamic balance of impeller and overspeed test, so the operation is stable and reliable. The same number of the machine, fan impeller, the same structure, but the material is different, generally speaking, the fan selection A3, fan selection 16Mn.
2, shell - welded with ordinary steel plate into the cochlea. Single suction fan casing made of three different forms (No. 8 - 12 cabinet made the overall structure, can not open, No. 14 - 16 case into two open, No. 18 - 29.5 case into three open). For the induced draft fan, the spiral plate is properly thickened to prevent wear.
3, air inlet - convergent, streamlined air inlet into the overall structure, with a bolt fixed to the inlet side of the fan.
4, adjust the door - used to regulate the flow of the device, axial installation before the air inlet. Adjustment range from 0 degrees (full) to 90 degrees (full closed). Adjust the position of the door to move: from the direction of the inlet to see in the right side of the right whirlwind machine, the move from top to bottom is pushed from the full closed to the full direction of the left cyclone, the move from top to bottom is pulled from the fully closed to fully open direction.
5, the transmission drive part of the spindle made of high quality steel, the fan is used for rolling bearings. The bearing box has two forms: No. 8 - 16 cylinder type bearing box body; No. 18 - 29.5 with two independent pillow bearing box. The bearing box is provided with a thermometer and an oil level indicator (only a draught fan). The lubricating oil is made of No. 30 mechanical oil. No. 8 - 16 integrated cylinder type bearing box such as the use of dry oil, on one side of the ball bearing box should be added to the oil baffle plate and the fixing groove to have. The draft fan is equipped with a water cooling device, therefore, the need to add water pipes, water consumption varies with temperature, generally by 0.5 - 1m3/h consideration.
Performance and selection of fan
The dimensionless performance curve and GY4-73 fan only to No. 10 prototype. Given by the dimensionless performance curve can be calculated or no 8-28 machine, have all dimensional performance.