1 Coupling type The BCL408 Turbo Centrifugal Compressor Coupling is a diaphragm coupling with a long axis in the middle, manufactured by John Crane. Coupling nominal torque 1589N.m, maximum continuous torque 6970N.m, allowable compensation: axial ± 2.9mm, angular ± 3.6mm. 2 cold state to median analysis The alignment of the compressor unit is a complicated and precise work. After the cold alignment, the unit will not exceed the clearance range of the supporting bearing due to the thermal expansion caused by the thermal gradient and the pressure gradient axis displacement during the operation, thus ensuring the unit's Automatic alignment. Therefore, when the unit is cold-centered, the position of the shaft and the amount of thermal expansion generated during normal operation of the unit must be taken into account. Assume that the ambient temperature at installation is 20 ° C, the cold alignment curve given by the BCL408 turbine centrifugal compressor unit manufacturer. Taking the steam turbine as the centering reference, the median value of the compressor can be calculated from the cold centering curve: radial 0.095mm, axial (Φ=300mm)-0.0171mm. Total reading of the sub-meter: radial (mm) axial (mm) Considering that the shaft of the steam turbine and the compressor will be relatively elongated in the hot state, the BCL408 turbine compressor unit manufacturer gives the shaft of the steam turbine in hot state operation. The elongation is 1.1mm, and the thermal elongation of the compressor shaft is small (0.20mm). It can be ignored when the cold state is centered. Therefore, it is required to have a pre-compression amount of 1.1 mm to the coupling diaphragm when the compressor unit is in the cold state to the center shaft end position, so as to ensure that the axial direction of the coupling diaphragm does not deform when in the hot state, and the diaphragm is not affected. life. 3 cold alignment procedure The BCL408 turbine centrifugal compressor unit is equipped with a special coupling for the coupling provided by the manufacturer. The special tool for centering is fixed on the shaft of the steam turbine. The dial indicator is placed on the shaft end of the compressor. The centering is corrected by three dial gauges. A radial dial gauge measures the radial deviation of the shaft to eliminate the shaft. The influence of the axial enthalpy when the car is rotating, the symmetrical assembly of the two axial dial gauges accurately measures the axial deviation. First, the axial and radial offset calibrations on the vertical plane are performed, and the thickness of the spacer under the four legs of the compressor is adjusted by adjusting the top wire in the vertical direction. Secondly, the axial and radial deviation calibration on the horizontal plane is carried out. Simply loosen the four fixing bolts on the four legs of the compressor and move the compressor horizontally with the adjusting top wire in the horizontal direction. The calibration is repeated until the dial gauge reading meets the cold centered value of the compressor unit. Connect the main line of the compressor inlet and outlet, and monitor the displacement of the casing and the coupling with a dial indicator. The displacement of the casing should not exceed 0.05mm, and the allowable radial displacement of the coupling should not exceed 0.03mm. 4 Pair median hot state correction When the BCL408 turbine centrifugal compressor unit was operated for the first time, considering that the parking coupling oil lubrication system could not stop at high temperature, the coupling could not be hot-corrected, and the four cats in the steam turbine were taken when the unit was running. A vertical dial gauge is used for the vertical direction of the four legs of the claw and the compressor to monitor the amount of thermal expansion under the operating conditions of the compressor unit, for example. Compare with the cold-centered curve and correct the deviation so that the thermal centering deviation of the shaft is as close as possible to zero, thus ensuring smooth operation of the unit for a long period. Standard value (mm) 0.147 0.147 0.147 0.147 0.217 0.217 0.16 0.16 measured value (mm) 0.14 0.12 0.12 0.13 0.20 0.21 0.15 0.14 5 Conclusion The centering quality of the compressor unit coupling is the guarantee condition for the smooth operation of the unit's long period. If the centering deviation is large, it will directly cause the shaft vibration, the bearing temperature rise, the coupling diaphragm damage, and at the same time aggravate the mechanical wear. Therefore, the cold coupling of the unit coupling should consider the influencing factors such as the process piping stress, thermal expansion and axial thermal elongation of the unit, so that the thermal centering deviation of the shaft is as close as possible to zero.
The shapes available are described in many published standards worldwide, and a number of specialist and proprietary cross sections are also available.
Structural Steel Material Structural Steel Material,H-Shaped Beam Q345B Grade, Q345B Grade Steel H Beam,H Shape Beam Dongguan Honglong Steel Structure Co,. Ltd. ,
The BCL408 circulating hydrogen centrifugal compressor is the key unit of petrochemical hydrogenation unit. It is driven by NG25/20 type back pressure steam turbine. The compressor and steam turbine are installed with joint base. The compressor and steam turbine are connected by diaphragm coupling. The BCL408 type circulating hydrogen centrifugal compressor was introduced into the technology of the Italian New Billion Company by the Shenyang Blower Factory. It adopts the radial split tube type structure, the flow rate under the rated working condition is 135000mn/h, the inlet pressure is 7.0Mpa, and the exhaust pressure is 8.7Mpa. The speed is 10210r/min, and the maximum continuous speed is 12600r/min. The NG25/20 steam turbine is manufactured by Hangzhou Steam Turbine Factory with the introduction of German Siemens technology. The multi-stage reaction back pressure type, the upward double-side intake and the downward exhaust, and the cylinder are horizontally split. Structure.
A steel I-beam, in this case used to support timber joists in a house.