大型汽轮机汽缸膨胀不畅的分析及改进（Analysis of poor expansion and improvement of large steam turbine cylinder）.docVIP

大型汽轮机汽缸膨胀不畅的分析及改进（Analysis of poor expansion and improvement of large steam turbine cylinder） Analysis of poor expansion and improvement of large steam turbine cylinder Abstract: Aiming at the improvement of domestic 300MW steam turbine cylinder because of expansion caused by poor cold load distribution uneven bearing, seal wear, prolong the warm-up time and other defects; analysis of the causes of the unsmooth expansion cylinder; to eliminate the sliding pin system jam, improved push-pull structure, pipeline and the cylinder connection base the platen material and lubrication system improvement and other aspects put forward the corresponding measures Keywords: poor expansion sliding pin system material push pull structure A summary. The home-made modified 300MW system of steam turbine produced by Shanghai steam turbine plant N300-16.5/535/535 reheat condensing type, single axis and four cylinder four steam turbine unit, the sliding pin system and expansion direction as shown in Figure 1 High pressure steam turbine stationary part of the dead in the turbine with a longitudinal axis of low pressure bearing (#3) intersection bottom center cross key line, high voltage static components to point forward expansion, front bearing seat (#1) in promoting the high pressure outside the cylinder under the cat will move forward in the bearing seat (about 32mm, #2) in the intermediate pressure outer cylinder of the claw will move forward about 17mm. Thrust bearings mounted in the bearing seat (#2), operation, thrust bearing with the shaft drives the whole bearing seat (#2) to move forward, then the high pressure rotor thrust bearing for the dead to forward expansion, medium pressure rotor thrust bearings relative to the opposite point and the high pressure rotor in the direction of expansion. In the starting and running period, the static part in their respective dead center directional expansion. High pressure cylinder is differential expansion, intermediate pressure cylinder s