1. 1.1.1.Application and scope of fans1.1Various types of fans produced by our factory are used as induced draft fans, blowers and exhaust fans of steam boilers of steam turbines. Others are used as ventilators in mines and other industries. 1.2 The medium conveyed by the blower is air, and its maximum temperature shall not exceed 80℃. The medium conveyed by induced draft fan is flue gas, and its maximum temperature does not exceed 250℃. The exhaust fan cannot transport corrosive gas, and the dust content of the medium does not exceed 80g/m? The maximum temperature shall not exceed 250℃. 1.3 the dust collector should be installed in front of the induced draft fan, and its efficiency should not be lower than 85%. Generally speaking, the amount of smoke and dust entering the fan should be less than 200mg/ m? . 2. Structure type of fan Structure type of fan 2. 1 The meaning of fan model is for example G4-60-1No.18d and G(Y, m) 4-60-1. 1 1( 12)- suction type and design serial number of the fan. 18 —————————————— Fan impeller diameter1800 mm.d ——————————————————————————————— The transmission mode is cantilever support. F ———————————— The transmission type is central impeller type. 2.2 Each series of centrifugal fans has different sizes. There are six standards for inlet and outlet angles of fans, which are 0, 45, 90,135,180 and 225 respectively. In the case of customization, you can refer to the special exit angle. 2.3 The fan impeller has two rotating directions, namely right-hand rotation and left-hand rotation. Seen from the motor end of the fan, the impeller rotates clockwise to the right and counterclockwise to the left. 2.4 Each series of fans is mainly composed of impeller, casing, air inlet box (not applicable to D-type fans), current collector, regulating door and rotating group. 2.4. The1impeller adopts plate-type or reverse-airfoil backward-curved blades, on which 16Mn steel plate is welded, which can enhance the wear resistance and service life of the fan. 2.4.2 The shell is welded with Q235 steel plate. The inner walls of induced draft fan and exhaust fan are welded with 16Mn steel wear-resistant liner, which can be replaced after wear. The outer surface of the fan is welded with hard ribs to increase the rigidity of the fan. The additional steel frame is installed on the shell of the large fan and fixed on the foundation plate. The housing and the current collector are bolted together. The adjusting door can be installed at the entrance of the current collector. The shell can be divided into two parts or three parts. Once the upper part of the housing is disassembled and removed, the rotor can be directly taken out of the housing. There is a manhole on the casing for easy maintenance and inspection. 2.4.3 The collector is hyperbolic bell-shaped, and its inlet is inserted into the impeller. The flow damping structure is welded on the outer surface of the current collector, which can reduce the loss of reverse airflow at the inlet of the impeller and increase the efficiency of the fan. 2.4.4 The air door controls the air flow by adjusting the opening angle of the blades. Control the opening and closing direction of the handle, and the left and right directions of the fan are opposite (the exhaust fan has no adjusting door, which can be determined according to the special needs of users). 2.4.5 The rotating device is driven by D or F, and the rolling bearing, motor and transmission device are directly connected by pins. The bearing box is equipped with thermometer and oil gauge, and lubricated with 10 ~ 30 # thin mechanical lubricating oil. Lubricating oil should be kept in the oil circuit and cooled with circulating water, and the water flow speed should be 0.5 ~ 1.5m? /h .2.5 After the impeller is manufactured, the balance check shall be carried out according to 2BJ72042-90 fan rotor dynamic balance standard, and the overspeed test shall be carried out according to TbiTQ328-83 fan impeller overspeed test method standard. The operation should be stable and reliable. 3 Fan Selection and Calculation 3. 1 Fan performance is shown in figure 1. The performance parameters of the fan under different working conditions shall be calculated according to the following formula: q1/Q2 = n1/N2; p 1/P2 =(n 1/N2)2(ρ 1/ρ2)； n 1/N2 =(n 1/N2)3(ρ 1/ρ2)； 3.2 The performance curve of figure 1 shall be specified under the following conditions: atmospheric pressure: Pa=760mmHg blower: medium density: ρ= 1.2kg/m? Inlet air temperature: t=20℃ Induced draft fan: medium density: ρ=0.85kg/m? Inlet air temperature: t= 140℃ exhaust fan: medium density: ρ= 1.025kg/m? Inlet air temperature: t=70℃ 3.3 If the operating conditions of the fan are different from those mentioned in Article 3.2, the performance parameters of the fan shall be revised according to the following formula: total pressure of the fan: p = P0× ρ/1.2 = P0× Pb× (273+20)/(760× (273+t). /s) internal power: ni = n0× ρ/1.2 = n0× Pb× (273+20)/(760× (273+t)) (kw) shaft power: ns = q× p/(1000. Pb, t, ρ-local atmospheric pressure, inlet temperature and medium density. Ns—— Rated power of fan in normal operation. η m-mechanical efficiency (0.98). N—— Select the rated power of the motor. K—— motor capacity correction factor (blower: K= 1. 15, induced draft fan: K= 1.3, exhaust fan: K= 1.2). 3.4 The power of the selected motor should not be lower than the rated power.

4. Installation of Fan Installation of Fan Installation, debugging, test debugging and test debugging and test debugging and test Before installing the fan, carefully check the structure and assembly drawing of the fan and check all parts and components. Problems should be solved in time. (1) An oil layer is added to the inner surface of mechanical parts to prevent rust and facilitate assembly and disassembly. (2) If there is a locating pin in the bearing box, install the locating pin first, and then tighten the bolt. (3) Check the casing and bearing box, etc. , and remove the debris inside.

4. 1 Installation requirements (1) Installation shall be carried out according to the attached drawings, paying special attention to the gap size between the current collector and the impeller. (2) Ensure the main horizontal position, the main shaft of the fan and the motor shaft are on the same axis, and the coaxiality is not greater than 0.05mm/m/m. (3) The direction of the damper cannot be reversed, and the direction of the inlet airflow should be consistent with the rotating direction of the impeller. (4) Sealing materials shall be installed between the connecting flanges of the shell to ensure air tightness and pneumatic efficiency. (5) Check whether the cooling water and bearing oil levels are normal. (6) After the fan is installed, run the gear to determine whether it is too tight or collided. (7) When a pipeline is installed at the inlet and outlet, the weight of the pipeline cannot be added to the casing, on the contrary, it should be supported by other parts. (8) After the fan is installed, it should be checked comprehensively and carefully, and the test can only be carried out after it meets the requirements. 4.2 The trial operation (1) mechanical operation test of the fan was carried out under no-load condition. When the fan runs normally, it will run at full load for a period of time. After the operation is qualified, the fan can run normally. (2) Continuous running time of the fan under normal working conditions a) After maintenance and installation, the trial running time of the fan shall not be less than 30 minutes. B) After the fan is installed, the commissioning time shall not be less than 2 hours. 5. Fan operation Fan operation Fan operation Fan operation 5. 1 Before the fan operation, the operation specifications should be formulated in advance and full preparations should be made. (1) Remove the sundries inside the fan, and close the manhole door and regulating door. (2) Run the devices of the fan, and check the gap size between the parts, and whether there is friction and collision between the dynamic and static parts of the fan. (3) No one is allowed to stand beside the impeller and the joint, and a protective top cover should be installed at the joint where danger may occur. (4) Check whether the oil level is in the normal position (before starting the fan, the oil level should be on the oil level line). (5) Check whether the instrument and circuit are normal. (6) Check whether the cooling system is normal. When the fan is running and the speed is normal, gradually open the regulating door to the required position. 5.2 If any of the following situations occurs, immediately turn off the fan for inspection. (1) The fan makes violent noise. (2) The bearing temperature rises sharply. (3) Strong vibration and collision of the fan. (4) The motor current and temperature rise are too large, and there is no effect after adjustment. (5) The cooling water is interrupted, and water seeps into the bearing or seriously leaks oil. 6. 1 The following measures should be taken for fan maintenance. (1) The fan must run under normal conditions, and special personnel shall be arranged to check the fan. (2) After the fan is overhauled and operated, attention should be paid to the normal operation of each component. (3) Remove the deposited dust and water regularly to prevent rust. (4) See table 1 for the rules and items of regular inspection. 6.2 Matters needing attention during normal operation of the fan. (1) When the airflow is too large or too small, it can be adjusted by adjusting the door. (2) Check the sensitivity of thermometer and oil meter. (3) If there is any abnormal phenomenon in the operation of the fan, the fan shall be immediately shut down for inspection. (4) Check and troubleshoot regularly to ensure the normal operation of the fan. (5) After fan maintenance, replace the lubricating oil every three to six months. Within one to two weeks after the trial operation of the fan, the lubricating oil should be completely replaced.