Problems in the unit fuel supply system Synthetic ammonia system In the case of high-load production, the turbine fan speed is 4200r/min and the fan speed is 929r/min. Due to electrical failure, the gear pump driven by the motor of the oil station is stopped. In the original design, when the lubricating oil pressure of the unit is lower than 0.03MPa, the piston of the quick closing valve cylinder should be retracted, and the speed closing valve is closed. The actual situation is that the reliability of the quick-closing valve is low, and when the valve is operated, there is a phenomenon that the closing is not strict, the delay and the non-action occur. Since the speed shut-off valve does not close the steam entering the turbine in time, the fan continues to rotate under the action of the huge inertial force, which causes the oil leakage of the unit sliding bearing, the severe wear of the rotor journal, the deceleration of the reduction gear, and the damage of the oil seal. normal production. Modification measures, the lubricating oil pump is installed at the free end of the fan shaft. The oil pump is selected as the lubricating oil pump. The technical parameters are as follows: flow / l / min 86158 pressure / MPa 4 shaft power / kw 0.8 - 1.6 speed / r / min 530-930 to the left. The output shaft design output shaft material is 35CrMo, and the quenching and tempering treatment HB225245 adopts 10mm and 8mm flat key B type connection. The output shaft is connected to the free end of the fan shaft. It adopts a radial 1:50 taper pin, the small head must be 8mm, and the axial direction must be 8mm cylindrical pin. After strength check, it can meet the requirements of use.
The coupling is selected from an elastic diaphragm coupling with a rated torque of 63 Nm and a maximum allowable speed of 514 rpm. The production of the oil seal supports the bearing as a blocking plate near the free end. After adding a three-screw oil pump, the output shaft seal is processed and installed by using the position of the original blocking plate. The bracket is made of A3 steel, and the labyrinth seal is made of LYZ hard aluminum. A method of lifting the fan rotor can be employed. However, the method needs to be dismantled and opened, which has a large workload, long maintenance time and high cost. This time, the method of installing the output shaft on the spot is adopted. The key is how to ensure the concentric requirements of the two axes. The fan supports the bearing block on the upper dial gauge, and checks the radial runout value of the matching part between the free end of the fan shaft and the output shaft. Install the output shaft and use the drill method.
The three-screw oil is installed on the oil pump shaft and the output shaft to install the semi-couplings respectively. The pump is placed on the cement foundation, the table is placed, and the oil pump is rough-finished with the horn, the inclined iron and the gasket, and the grouting is performed twice. After the turbine, gearbox and fan are aligned, the fan output and the oil pump are corrected again, the thickness of the gasket is adjusted, and the technical requirements are met to connect the elastic film coupling. The side of the fuel tank of the three-screw oil pump is 120mm from the bottom of the tank. It is cut with a gas, polished, placed in a coarse filter, and welded from the inside of the tank with hydrogen arc welding. The inlet pipe of the oil pump adopts æ›°89X3mm, the outlet pipe adopts the 89mm/must 57mm conversion and is matched with the 57x3mm and the crude oil station gear pump output manifold must meet 45mm. The return pipe is made of a 57mm oil return tank, and the pipe is ICrl8NigTi. Install an exhaust valve at the high point of the inlet pipe of the oil pump, and install vacuum pressure gauge and pressure sleeve on the inlet and outlet pipes of the pump. Pipes are connected with restrictor orifices as close as possible to the oil pump. After adding a three-screw pump for oil supply, as the fan speed increases, the two oil pumps supply oil to the unit at the same time. The oil pressure is high, the oil returns to the oil, and the oil is splashed from the oil seal. When the oil splashes When the turbine surface is high, the lubricating oil is burned due to the high turbine temperature. The oil station oil pipeline is changed. On the pipeline between the gear oil pump outlet and the oil filter, an automatic constant pressure valve is added, and the discharge pipe is matched back to the fuel tank. Turbine bearing housing return oil pipe change turbine front and rear bearing return oil pipe merge into 45x2mm4 effect start motor drive gear oil pump, cleaning oil pipe and various lubrication bearing points, after oil washing qualified, warm steam turbine, three screw pump inlet pipe exhaust After that, start the induced draft fan unit. The turbine speeds up to the lowest speed range of the WOODWARD governor, the speed is 2500r/min, the unit oil supply pressure is 0.23MPa; when the turbine continues to increase to 3200r/min, the oil pump driven by the motor is stopped, and the new three-screw pump is added. For the unit oil supply, the oil pump outlet pressure is 0.25MPa, the unit oil supply pressure is 0.12MPa, the turbine speed is up to 4200r/min, the oil pump is out, the mouth pressure is 0.38MPa, and the unit oil supply pressure is 0.14MPa.
High Frequency Pipe Welding Machine is a equipment which belongs to cold roll forming, also belongs to high frequency hot welding forming. The high frequency is same with other roll-formed profiles machines, de-coiling, leveling, cold roll forming, while the High Frequency Welding Machine is welded by high frequency after it is formed by the stations of rollers. high frequency pipe welding machine can produce different shapes of tubes or pipe by changing the mold, in a word, one high frequency pipe welding machine can produce the square tube, the round tube, the rectangular tube.
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