Propylene compressor shaft coupling

Propylene compressor coupling transformation - 2019 10 - 23 Yuan Shengbin black gentleman ( Shenhua ningxia coal group, coal chemical industry limited liability company subsidiary company of methanol plant, east ningxia ningxia 750411) Abstract: propylene compressor is the core of the annual output of 600000 tons of methanol plant equipment, cold quantity for low-temperature methanol wash unit. Between the compressor and gear box adopts flexible shaft threaded connection assembly, this way of assembly technology is relatively old, thread connecting thread part of the overhaul maintenance easier to stick to death, restricted the repair work smoothly and the device and stable operation. This paper introduces the unit connection to currently use common diaphragm coupling process and effect. Key words: flexible shaft; Coupling; Adapt the propylene compressor propylene as medium, by centrifugal compressor compression, condensation water, throttling depressurization evaporation and cooling effect, provide cold energy for low temperature methanol washing propylene heat exchanger of the system, to the low temperature methanol washing system circulating cool methanol, ensure the normal operation of the system of rectisol plant. Propylene compressor for york companies in the United States MODELM455A type level 4 centrifugal compressor, the use of steam turbine drive, shaft power 8518 kw, compressor rotor with flexible shaft connection, flexible shaft and main shaft through the threaded connection assembly, this way of assembly technology is relatively old, threaded connections threaded portion when maintenance is easy to stick to death, the risk of damage to the flexible shaft and rotor, restricted the repair work smoothly and the device and stable operation. Therefore, in November 2013, according to the present situation of the compressor, the author proposed to the original machine in factory coupling flexible shaft diaphragm coupling instead, lest delay time driving. Here is the detailed technical implementation. 1 project implementation of the content of the research work since its launch, has carried out a large number of detailed studies and data collection, mainly divided into propylene compressor rotor maintenance problem analysis, data collection, preliminary design and the original machine rotor rotor size, the size of the coupling of surveying and mapping surveying and mapping, a new rotor installed three phases. First stage: propylene compressor rotor maintenance problems analysis. Propylene compressor rotor with flexible shaft connection, flexible shaft and main shaft screw thread connection part in overhaul disassembly and installation easy to stick to death, causing inconvenience to maintenance, overhaul time delay. In October 2013, propylene compressor in overhauling process, flexible shaft connected to the compressor shaft threaded portion stick to death, cannot be rotor and flexible shaft, entrust a compressor manufacturing company for destructive removal and processing new flexible shaft, new processing of flexible shaft during the installation process and the main shaft again stick to death, destructive reprocessed new flexible shaft, dismantled and qualified assembly back pack, delayed repair for 10 days. The second stage: data collection, preliminary design of rotor. （ 1) Collect the original compressor parameters, including the media, design pressure, design temperature, critical speed and shaft power parameters in detail. （ 2) According to the original machine rotor design conditions and the present operation of process data, the compressor rotor, the following modification. (1) the original machine rotor of surveying and mapping, exterior rotor features including impeller, the impeller meridian plane type and blade, back arc line all use seven coordinates of laser scanning and point cloud data gathering equipment, the three-dimensional simulation software can be compared to the forming, surveying and mapping design to ensure the consistency of the rotor and the original machine rotor size. (2) the main rotor material choice according to the results of the calculation of the surveying and mapping and the new rotor and API617 standard to design, manufacture, main shaft of rotor, blade manufacturing materials according to the drawing requirements implementation, main shaft material is 34 crni3mo, is 40 crnimo impeller material, strict control of material heat treatment process, to ensure that the materials, various technical indicators. 3. Select the appropriate calculation of rotor torque, flexible coupling, and determine the new shaft head shaft neck and the size of the shaft head cone, coupling of imported diaphragm coupling. (4) the side of the coupling spindle internal thread to cancel, change to cone connection form, according to the speed and transmission power, calculating transmission torque, selection & phi; 114. Type 3 cone size, using the hydraulic propeller, tear open outfit is convenient, coupling of imported diaphragm. The third stage: the new rotor installation commissioning. Since July 2014 propylene compressor rotor after installation, for the low speed, high speed, commissioning, after July 2 compressor load startup, the normal process equipment parameters, the compressor vibration and displacement trend stationary compressor running in good condition. 2 for the economic and social benefits and application prospects of overhaul died from a flexible shaft threaded connections, outsourced repair 10 d, considering the flexible shaft 2 d disassembly, installation difficulties affect maintenance time, maintenance time of extended by 12 d, 2150 t/d× methanol damage; 12 d = 2。 580000 tons, the methanol calculated according to 2170 yuan per ton, full cost 1749. 99 yuan/ton, 2170 - methanol net profit per ton 1749. 99 = 420. 01 yuan/ton, the modified produce benefit maintenance 2 at a time. 580000 tons of & times; 420. 4 yuan/ton = 1083. 70000 yuan. 3 conclusion the modification to the original flexible shaft connection form instead of the more general diaphragm coupling connection mode, not only solve the flexible shaft removal difficulties in maintenance, easy to stick to death, the problem of delay repair time, at the same time modified rotor has good compatibility with the original rotor, rotor for propylene compressor spare parts, ensure the rotor failure for the first time for replacement, namely save maintenance cost, also in order to ensure the equipment run steady for a long period of time laid a good foundation. References [ 1] API617（ 2009). Petroleum, chemical industry and industrial gas axial, centrifugal compressor and expander [ Z] 。 ( 2] API671 refining using special coupling [ Z] 。 ( 3] API670 vibration and axial position and bearing temperature monitoring system [ Z] 。 ( 4] Propylene compressor specification [ Z] 。 Source: 'information technology' 31, 2015