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CN-117189276-B - Load distribution method for steam turbine generator

CN117189276BCN 117189276 BCN117189276 BCN 117189276BCN-117189276-B

Abstract

The invention provides a load distribution method for a steam turbine generator, which comprises the steps of setting a load measurement point and an offset measurement point respectively, repeatedly carrying out load quantity test, carrying out primary adjustment on the thickness of a footing gasket corresponding to a stable measurement point, carrying out pressurization adjustment on a jack at the stable measurement point according to a load meter of the steam turbine generator, maintaining the jack at the stable measurement point, carrying out load quantity test on each jack at the adjustment measurement point, and carrying out secondary adjustment on the thickness of the footing gasket corresponding to the adjustment measurement point according to a test result. According to the invention, through setting the load measuring points and the deflection measuring points which are in one-to-one correspondence with the footing gaskets, after the stability of the stator part of the turbogenerator is adjusted by utilizing the load quantity test at each load measuring point and each deflection point, the thickness of the corresponding footing gasket is stabilized, and the thickness adjustment is carried out on the footing gasket of the end cover part of the turbogenerator, so that the load leveling of the turbogenerator after the maintenance of the turbogenerator is rapidly completed, and the vibration of the turbogenerator is eliminated.

Inventors

  • CHEN CHANGLI
  • ZHANG JINGHUI
  • FENG KUN
  • LI YONG

Assignees

  • 国家电投集团河南电力有限公司技术信息中心

Dates

Publication Date
20260508
Application Date
20230831

Claims (7)

  1. 1. A load distribution method for a turbo generator, the load distribution method comprising: Respectively setting a load measuring point and an offset measuring point, and installing a dial indicator at each offset measuring point; selecting a plurality of load measuring points as stable measuring points, and the rest load measuring points as adjustment measuring points; installing jacks with pressure gauges at each stable measurement point; repeating the load test, and primarily adjusting the thickness of the footing pad corresponding to the stable measurement point according to the test result; Pressurizing and adjusting the jack at the stable measuring point according to a load meter of the steam turbine generator; installing the jack with a pressure gauge at the adjustment measurement point; maintaining the state of the jacks at the stable measuring points, and simultaneously carrying out load capacity test on each jack at the adjusting measuring points; re-adjusting the thickness of the corresponding footing pad at the adjustment measuring point according to the test result; the load measuring points on the straight line L1 are sequentially from left to right, the load measuring points on the straight line L2 are sequentially from right, the load measuring points are sequentially from left to right, the load measuring points are sequentially from the fifth, the first, the third and the seventh, the first, the second, the third and the fourth load measuring points are selected as stable measuring points, each stable measuring point is located on a stator part of the steam turbine generator, and the connecting lines among the stable measuring points form a rectangle.
  2. 2. The load distribution method for a turbo generator according to claim 1, wherein the load amount test includes pressurizing each of the jacks by the same pressure value; performing the above-mentioned pressurizing operation a plurality of times until one of the load measuring points having the lowest height rises by a set height; recording data of each pressure gauge when the lowest elevation in the load measuring points is set to be high each time, and forming a pressure gauge array; recording the data of each dial indicator when the lowest height in the deviation measuring points rises to a set height each time and forming a dial indicator array; And restoring each jack and the dial indicator to an initial state.
  3. 3. The method for load distribution of turbo generator according to claim 2, wherein in the primary adjustment process, two groups with minimum data deviation in the dial indicator array are selected first, and then thickness adjustment is performed on the footing pads at corresponding positions according to the average value of the data differences at the positions corresponding to the stable measurement points in the two groups of dial indicator arrays.
  4. 4. A load distribution method for a turbo generator according to claim 2, wherein each of the offset measurement points is distributed along an edge of the turbo generator and each of the offset measurement points is located on one of two mutually parallel arcs.
  5. 5. A load distribution method for a turbo generator according to claim 4, wherein the load measuring points are located on two straight lines parallel to each other, respectively, and the load measuring points located on the two straight lines are in one-to-one correspondence with each other.
  6. 6. A load distribution method for a turbo generator according to claim 5, wherein, when the thickness of the corresponding footing pad at the adjustment measuring point is adjusted, the load amount test is repeated a plurality of times while maintaining the state of the jack at the stable measuring point until the data difference between each of the dial indicators is smaller than a set deviation range.
  7. 7. The load distribution method for a turbo generator according to claim 5, wherein when the jack at the stable measurement point is pressurized according to the load meter, the pressurization value of the jack is equal to the average value of the pressure meter array formed during the first load measurement minus the load value of the turbo generator end in the load meter.

Description

Load distribution method for steam turbine generator Technical Field The invention belongs to the technical field of load leveling of a generator, and particularly relates to a load distribution method for a steam turbine generator. Background The turbo generator is a synchronous generator, which mainly consists of a rotor and a stator. In a thermal power plant, a steam turbine generator is one of three key devices of a thermal power plant, and is mainly an electrical device which uses a steam turbine as a prime motor to drive a rotor to rotate and converts mechanical energy into electric energy by using an electromagnetic induction principle. In the running process of the turbogenerator, the overlarge vibration of a bearing seat of the turbogenerator can accelerate the abrasion of certain parts in the turbogenerator, so that the fatigue damage of a bearing bush and the loose cracking of secondary grouting of a foundation are caused, the cooling water pipe of a stator hydrogen cooler of the turbogenerator is cracked by vibration and other adverse effects, and even under a special working condition, accidents such as tripping of the turbogenerator can be caused, so that the safety and the economy of the turbogenerator are seriously influenced. When the unit is overhauled, the rotor center is often required to be adjusted due to foundation settlement and the like. Because equipment such as a main oil pump and the like is arranged in the front box of the turbo generator set, the adjustment is complex, and most of set maintenance staff can put a large adjustment amount on the stator of the turbo generator in order to ensure the maintenance period and the like. During service adjustment, the foot pads of the generator stator are inevitably disturbed. Because the two sides and the middle part of the turbonator are not integrally formed, the two sides of the turbonator also have certain unbalance, and these factors can cause great deviation of the load distribution of the turbonator stator after maintenance. Because the weight of the turbo generator can reach hundreds of tons, after equipment is installed and overhauled improperly, the unit can generate larger vibration under the action of tiny exciting force in the running process. Disclosure of Invention In order to solve the problem that the turbine generator in the background art can generate larger vibration under the action of tiny exciting force in the running process of the turbine generator after equipment is installed and overhauled improperly, the invention provides the following technical scheme: A load distribution method for a turbo generator, comprising: Respectively setting a load measuring point and an offset measuring point, and installing a dial indicator at each offset measuring point; selecting a plurality of load measuring points as stable measuring points, and the rest load measuring points as adjustment measuring points; installing jacks with pressure gauges at each stable measurement point; repeating the load test, and primarily adjusting the thickness of the footing pad corresponding to the stable measurement point according to the test result; Pressurizing and adjusting the jack at the stable measuring point according to a load meter of the steam turbine generator; installing the jack with a pressure gauge at the adjustment measurement point; maintaining the state of the jacks at the stable measuring points, and simultaneously carrying out load capacity test on each jack at the adjusting measuring points; And readjusting the thickness of the corresponding footing pad at the adjustment measuring point according to the test result. The load capacity test comprises the steps of pressurizing each jack by the same pressure value; performing the above-mentioned pressurizing operation a plurality of times until one of the load measuring points having the lowest height rises by a set height; recording data of each pressure gauge when the lowest elevation in the load measuring points is set to be high each time, and forming a pressure gauge array; recording the data of each dial indicator when the lowest height in the deviation measuring points rises to a set height each time and forming a dial indicator array; And restoring each jack and the dial indicator to an initial state. Further, in the primary adjustment process, two groups with the smallest data deviation in the dial indicator array are selected, and then thickness adjustment is performed on the footing gaskets at the corresponding positions according to the average value of the data differences at the positions corresponding to the stable measurement points in the two groups of dial indicator arrays. Further, each of the offset measurement points is distributed along an edge of the turbo generator, and the offset measurement points are each located on one of two mutually parallel arcs. Further, the load measuring points are respectively located on two mutually parallel straight lines, a