Solution of turbine thrust segment temperature increase

Solution and the secret 2019 - turbine thrust segment temperature reason 10 - 08 turbo-generator set of thrust bearing is withstanding the rotor axial thrust in the operation, to maintain the steam turbine rotor and stationary part of the normal axial clearance. Thrust bearing segment temperature is an important parameter in the running state of thrust bearing, once cause thrust segment ultra-high temperature, sharply wear burn out, will does not allow the axial displacement of rotor, collision on flow passage, the steam turbine is wear accidents. Causes of thrust segment ultra-high temperature summarize into the next: ___________ of thrust and thrust plate parallel to exceed bid, bearing and shaft neck of degrees, causing work segment of a region of temperature on the high side, and when the shaft located Yang value is greater than the bearing before Yang is large, will cause the thrust face upper segment temperature higher than the temperature of the second half of the tile, on the contrary, the second half of the tile under the thrust is greater than the upper segment, segment in the second half and the temperature is higher than the upper segment. This rotor manufacturing quality caused by thrust plate wave deflection value is big, cause the runtime thrust segment on the thrust at the same time difference is big, high speed, continuous operation for each segment of the thrust on the larger change constantly, will affect the establishment of the instability of the oil film, this kind of situation will cause the temperature of the working face whole segment is higher. 3. The thickness of the thrust face segment ontology or segment between the thickness of the difference is too big, due to the thickness of the tile itself is poor or segment between the thickness of the difference is too big, causing thick in the operation of tile under the thrust is greater than the thin segment of thrust, caused part of the thicker segment at higher temperature. _____ the tile grinding, grinding segment itself does not reach the designated position or the whole segment between the grinding is not good, causing segment in contact with the thrust plate is not good, the whole grinding, tile to put in place, and under certain axial thrust, the contact surface is the real contact area. ⒌ between thrust is not appropriate. Due to measurement or bearing dynamic misalignment, thrust clearance is not enough, lack of lubricating oil flow, oil film forming is not good, tile temperature on the high side. Pictures of upper and lower thrust face by thrust is inconsistent. Support a joint thrust bearing body, locating pin with tight force is not enough, lead to assemble bearing body when the upper and lower parts, the upper and lower thrust working face under the thrust of inconsistencies, reasoning caused the uneven distribution of upper and lower temperature of thrust tile work, part or individual segment temperature on the high side. But support a spherical joint bearing thrust force is not appropriate, because unit designed by spherical force is designed according to the ideal state, but often in the actual production of the spherical surface and spherical finish due to manufacture, installation and other reasons can not meet the design requirements. Under the action of thrust bearing in the operation of the axial age self-aligning ability is bad, then each thrust segment of thrust, caused part of the higher temperature of tile, this kind of phenomenon commonly as the change of load, tile swimming is evident in the high temperature area. ⒏ establish abnormal oil film. The rocking of the thrust segment itself was not enough and oil baffle ring of manufacturing, positioning to causes such as segment as the rotor turns, oil baffle ring shouldered by death and not free follow-up, disturb the normal set up, the oil film and leads to segment and less oil film formed between thrust disc or close to the friction of running state, lead to tile higher temperature ( This segment of the high temperature area and high value is stable) 。 ⒐ support a joint thrust bearing oil seal clearance adjustment improper, thrust bearing with four oil seal ( Two babbitt oil seal, two copper shaft seal) Because of improper adjustment shaft seal clearance, in the operation of the shaft seal to resist rotation caused by spherical cannot under the action of thrust self-aligning with axis, resulting in part of the thrust segment under the axial thrust is larger, the temperature is higher. ⒑ unit increase axial thrust, scaling on flow passage, gland chipped, seal clearance exceeds the standard; Flow section of the radial seal clearance, will increase per level before and after the partition of steam pressure difference, make axial thrust increases. ⒒ thrust bearing oil shortage, will lead to the rising of the temperature of the tile, and under a state of lack of oil to run for a long time, will also increase the segment wear. （ Source: the eagle eye research)