CN113356948B

CN113356948B - Method for installing multi-support long shafting of 1000 MW-level steam turbine generator unit

Info

Publication number: CN113356948B
Application number: CN202110642698.7A
Authority: CN
Inventors: 段勇刚; 陈庚文; 朱永玖; 龚新义; 郑云鹏
Original assignee: PowerChina Hubei Electric Power Construction Co Ltd
Current assignee: PowerChina Hubei Electric Power Construction Co Ltd
Priority date: 2021-06-09
Filing date: 2021-06-09
Publication date: 2023-06-09
Anticipated expiration: 2041-06-09
Also published as: CN113356948A

Abstract

The invention provides a method for installing a multi-support long shafting of a 1000 MW-level steam turbine generator unit. The installation method comprises the following steps: (1) platen adjustment and adjustment of the bearing mount in place; (2) Grouting and pouring the cement cushion block by adopting a special mould box and a diversion trench with a defoaming strip; (3) the low pressure cylinder and bearing housing are in place; (4) The method comprises the steps that a bearing bush grinding limiting tool is used for limiting and grinding a bearing bush of a low-pressure cylinder; (5) hoisting a generator stator and a high-pressure cylinder; (6) Penetrating a generator rotor into a generator stator bore by adopting a travelling crane matched sliding method; (7) Adjusting the air gap between the generator rotor and the stator and the magnetic center of the generator; (8) shaft system centering; (9) Measuring and adjusting the center of the partition plate, the radial clearance of the steam seal and the axial clearance of the through flow; (10) The cylinder buckle cover, the secondary pouring of the foundation, the center review of the shafting and the coupling connection. The invention greatly shortens the installation time of the shafting and ensures that the generator set can stably run with reliable installation quality.

Description

Method for installing multi-support long shafting of 1000 MW-level steam turbine generator unit

Technical Field

The invention relates to installation of a multi-support long shaft system of a steam turbine generator unit in a thermal power plant, in particular to an installation method of a multi-support long shaft system of a 1000 MW-level steam turbine generator unit.

Background

With the higher and higher requirements of national energy conservation and environmental protection, the high-parameter, high-capacity and high-efficiency unit in the thermal power generation rapidly develops at present. The ultra-supercritical million units are the main machine type for coal motor unit production due to the environment protection and high efficiency.

The 1000 MW-level turbo-generator unit adopts a five-rotor eleven-bearing bush supporting mode, an excitation brush frame bearing is a stable bearing, the total length of the turbo-generator unit is 54.6m, the whole turbo-generator unit shafting comprises a generator rotor, a low-voltage rotor B, a low-voltage rotor A, a medium-voltage rotor and a high-voltage rotor, the rotors are rigidly connected, and a connecting bolt is in clearance fit with a screw hole. Because the shafting of the 1000 MW-level turbo generator set is a large-capacity multi-support long shafting, the installation of the large-capacity multi-support long shafting is always the difficulty and the key point of the installation of the turbo generator set, for example, after the low-pressure cylinder is combined, the low-pressure rotor is used for centering the reference oil depression nest of the low-pressure cylinder, the center deviation is required to be within 0.05mm, and the bearing bush gasket is required to be adjusted beyond the deviation value; the bearing bush cushion blocks are spherical, five bearing bush cushion blocks are arranged at 15 degrees and 60 degrees of the left and right of the lower bearing bush, one bearing bush cushion block is arranged at the top of the upper bearing bush, the center of the spherical cushion block is not easy to control when the bearing bush is ground, the bearing bush cushion blocks are easy to grind, the gap of the bearing bush hole is uneven after the rotor is in place, and the bearing bush contact is uneven; besides the grinding of the bearing bush, the installation of each step such as the adjustment process of the longitudinal and transverse horizontal of the bedplate bearing seat, the horizontal and shafting of the cylinder, the penetration of the generator rotor, the centering of the shafting and the like plays a key role in the stable operation of the unit.

Besides, the turbo generator is core equipment of a thermal power plant, the self weight of the turbo generator is large, the 1000 MW-level turbo generator unit weighs thousands of tons, the running rotating speed of the unit is up to 3000r/min, and the vibration requirement of the unit under high-speed running is less than 75 mu m. This is extremely demanding for the support system carrying the turbo-generator set. In recent years, the sizing block structure of the bedplate in the bearing system of the steam turbine generator set has been gradually replaced by a high-strength grouting material cast-in-situ cushion block. The high-strength grouting material is prepared by taking high-strength materials as aggregate, cement as a binding agent and substances such as high flow state, micro expansion, segregation prevention and the like as auxiliary materials, and has the characteristics of high strength, early strength, self-leveling and the like. However, in the process of casting and manufacturing the cushion block, the quality problems of dense bubbles, hollows, cracks and the like are very easy to occur, so that a large amount of reworking is caused, the construction period is prolonged, and the cost is increased.

Disclosure of Invention

The invention provides a method for installing a multi-support long shaft system of a 1000 MW-level steam turbine generator unit, which aims at the problem of difficult installation of the existing large-capacity multi-support long shaft system, can ensure that cement cushion blocks are cast to be qualified at one time, can accurately control the longitudinal lifting degree and the transverse levelness of each bedplate and each bearing seat, ensure that bearing bushes are uniformly and well ground and contacted, can measure and detect the center among rotors of the shaft system, ensure the centering effect of the shaft system, ensure the installation accuracy of the whole shaft system, shorten the installation time of the shaft system and ensure that the generator unit can stably operate.

In order to achieve the technical aim, the invention provides a method for installing a multi-support long shafting of a 1000 MW-level steam turbine generator unit, which is characterized by comprising the following specific steps:

(1) Elevation adjustment and installation of the bedplate: after the foundation is accepted, determining the central axis of the steam turbine generator unit, determining the position of the bedplate by taking the central axis as a reference, adjusting the horizontal of the bedplate by using an adjusting screw carried on the bedplate, accurately adjusting the longitudinal lifting degree and the transverse horizontal degree of the bedplate and the bearing seat by using an adjusting tool, and then fastening foundation bolts to fix the bedplate;

(2) Pouring a cement cushion block at the bottom of the bedplate: the two sides of the bedplate are respectively provided with a mould box for pouring the cement cushion block at the bottom of the bedplate; the die boxes comprise a grouting die box higher than the platen and a slurry overflow die box lower than the platen, and the two die boxes form a pouring space at the bottom of the platen; pouring grouting materials by using a diversion trench with a plurality of defoaming strips at the bottom, pouring the grouting materials from a high-side grouting mouth die box, overflowing the grouting materials from a low-side grouting mouth die box, ensuring that a cement cushion block is poured tightly without bubbles in the pouring process, wrapping a pouring gate and an overflow outlet of the die box by wet cloth after the grouting materials are poured, curing for 3-4 days at the temperature of 10-35 ℃, and then removing a template to finish the pouring work of the cement cushion block;

(3) The low-pressure cylinder and the bearing seat are positioned: the low-pressure cylinder comprises a low-pressure cylinder A and a low-pressure cylinder B, the low-pressure cylinder is directly and horizontally combined on the bedplate, after all bolts are assembled and fastened, the bolts and the locating pins are spot welded, and the low-pressure cylinder is aligned and leveled according to the longitudinal and transverse central line and elevation requirements of the foundation, so that the horizontal and longitudinal lifting degree of the cylinder can reach the drawing requirements; then, each bearing seat is sequentially positioned, the bearing seat is initially found according to the longitudinal and transverse central lines of the foundation and the elevation requirement of the shaft system finding map, the elevation and the horizontal lifting degree of each bearing seat are adjusted to meet the design requirement, the transverse horizontal deviation of the bearing seat is not more than 0.20mm/m, and the longitudinal lifting degree is consistent with the lifting degree of the shaft neck of the rotor;

(4) Grinding of the low-pressure cylinder bearing bush: after the bearing seat is in place and the rechecking elevation, the longitudinal lifting degree and the transverse levelness are adjusted, bearing bush grinding is carried out, and when the bearing bush grinding is carried out, a bearing bush grinding limiting tool is used for limiting the bearing bush grinding, so that the bearing bush grinding can rotate in a fixed circumferential track without deflection caused by rotation in any direction when the bearing bush grinding is pried in a small amplitude;

(5) Hoisting a generator stator and a high-pressure cylinder: installing a generator end cover after the generator stator is hoisted in place, and carrying out limit grinding on a generator bearing bush in the mode of the step (4); the high-pressure cylinder is integrally hoisted, support conversion is carried out after the high-pressure cylinder is in place, the bearing bush supports the rotor, the bearing seat cat claw supports the cylinder, and the low-pressure cylinder and the high-pressure cylinder are adjusted in horizontal and shafting lifting degree after the high-pressure cylinder is in place;

(6) Penetrating through a generator rotor: a crane is matched with a sliding method to penetrate a rotor, a sliding plate assembly is arranged in a stator bore of the generator, the rotor is hoisted and penetrates into the stator bore through sliding of a supporting sliding block, the rotor slides to the limit of a crane lifting point to convert the crane lifting point to the tail, the rotor finally slides to a formal positioning position, and an end cover is arranged to formally position the rotor;

(7) Adjusting the air gap between the generator rotor and the stator and the magnetic center of the generator: the gaps between the stators and the rotors at the upper, lower, left and right ends of the front and rear ends of the generator are adjusted, and the deviation of the gaps is not more than 10% of the average value; the deviation of the magnetic force center of the generator is not more than 1.0mm;

(8) And (5) shaft system centering: the method comprises the steps of taking a designed shaft system centering diagram as an adjustment standard, firstly positioning a low-pressure B cylinder rotor, respectively fixing rotor disc moving limiting plates which enable the rotor not to move forwards and backwards in the rotating process at two ends of the low-pressure B cylinder rotor, and then measuring and adjusting the center of a shaft system between the rotors by taking the low-pressure B cylinder rotor as a shaft system reference and matching with a rotor shaft system centering detection tool;

(9) Measuring and adjusting the center of the partition plate, the radial clearance of the steam seal and the axial clearance of the through flow: after the centering of the shaft system is finished, assembling a partition plate or a partition plate sleeve, sequentially finishing the measurement and adjustment of the center of the partition plate, the radial clearance of the steam seal and the axial clearance of the through flow, and measuring and adjusting the air clearance and the magnetic center of the generator by using a clearance measuring tool; the rotor disc movement limiting plate in the step (8) is adopted to relatively fix the axial position of the rotor when the rotor is driven in the radial steam seal clearance measurement and through-flow axial clearance measurement processes;

(10) Ending work: and (3) after the step (9) is finished, sequentially performing cylinder buckling, foundation secondary pouring and shafting center review, and finally sequentially connecting the rotor couplers to the two ends by taking the low-pressure B cylinder rotor as a reference, uniformly fastening the coupler bolts by using an electrohydraulic torque wrench, and finishing shafting connection.

The invention has the preferable technical scheme that: after the central axis of the steam turbine generator unit is determined in the step (1), the central axis of the steam turbine generator unit is marked by pulling the steel wire, and on the basis of the central axis, the bedplate is elevated at the center of the bearing bush by matching a micro-distance high-precision adjusting tool with a high-precision level gauge and an image-combining level gauge, and the elevation of each bedplate is precisely controlled within 0.02mm by using the high-precision level gauge.

The invention has the preferable technical scheme that: before the cement cushion block is poured in the step (2), removing cuttings and dust on the surface of a concrete foundation, cleaning, supporting corresponding mold boxes according to the paying-off positions of the cushion blocks, sealing the gaps of the mold boxes, and sealing the mold boxes from the outer sides of the mold boxes by cement mortar or foam glue to prevent slurry leakage; the grouting material of the pouring cement cushion block adopts MF-870G grouting material, the grouting material adopts warm water with the temperature of 30+/-1 ℃ to stir, 3.5L-3.75L of water is added into each 25KG grouting material, a hand-held mixing blade rotary stirrer is adopted to stir uniformly, 80% of the total water is firstly added into a container during stirring, then the total grouting material is slowly added, after stirring for 2-3 minutes, the rest 20% of water is added until the grouting material is fully and uniformly stirred, and the time from stirring to pouring is controlled within 20 minutes until most of bubbles overflow; the diversion trench is adopted to perform two-layer casting during casting, the second layer casting is performed after 20-40 minutes after the first layer casting, and the gap between the surface of the first layer and the bottom surface of the grouting template is 30-40 mm; the pouring diversion trench comprises a diversion trench support and a concave diversion trench body, wherein the diversion trench body is fixed on the diversion trench support in a 45-degree inclined manner, a feed inlet is upward, a discharge outlet is downward and is opposite to an injection inlet of a grouting die box, a plurality of defoaming blocking strips are uniformly arranged at the bottom of the diversion trench body, the height of each defoaming blocking strip is 12-15 mm, the width of each defoaming blocking strip is 14-20 mm, the length of each defoaming blocking strip is equal to the width of the bottom of the diversion trench body, and the distance between every two adjacent defoaming blocking strips is 90-110 mm.

The invention has the preferable technical scheme that: the step (4) is characterized in that the center bearing bush grinding limiting tool comprises two limiting channel steels, the two limiting channel steels are fixed on two sides of the spherical bearing bush body through bolts, two limiting bolts are symmetrically arranged on the limiting channel steels on two sides, and after the bearing bush is mounted on the bearing bush sleeve, the screw heads of the limiting bolts are adjusted to enable the screw heads of the limiting bolts to be in contact with the bearing bush sleeve for limiting.

The invention has the preferable technical scheme that: the generator stator and the high-pressure cylinder in the step (5) are hoisted in place by adopting two travelling cranes and a shoulder pole Liang Jiaye pressure hoisting device; the low-pressure cylinder comprises a low-pressure cylinder A and a low-pressure cylinder B, wherein the low-pressure cylinder A is horizontally adjusted to be basically horizontally and slightly higher towards the side of the boiler, and the longitudinal horizontal adjusting end is higher than the electric end; the low-pressure B cylinder is adjusted to be basically kept horizontal and slightly higher to the side of the boiler, and the longitudinal horizontal electric end is higher than the adjusting end.

The invention has the preferable technical scheme that: when the generator rotor is penetrated in the step (6), firstly, an arc plastic plate, a rubber pad and an arc steel sliding plate are sequentially installed in the stator inner bore to form a sliding plate assembly, then, paraffin is used for priming the inner surface of the arc steel sliding plate, then, a lubricant is coated, and finally, the generator rotor is slipped into the stator inner bore by matching with an arc supporting sliding block installed at the bottom of the motor rotor and a crane hoist.

The invention has the preferable technical scheme that: the air gap adjusting process of the generator rotor and the stator in the step (7) is that the generator rotor is marked at 90-degree intervals according to the up-down and left-right positions, the rotor is moved according to a steering wheel during operation, the rotor is stopped at the 90-degree mark point, the up-down and left-right gaps between the stator and the rotor at the front and rear ends of the generator are measured, and when the gaps exceed 10% of the average value, the spherical gasket of the adjusting bearing bush is adopted to enable the air gap to meet the design requirement, and the air gap of the generator is uniform; when the magnetic force center of the generator is measured, the total expansion amount of each rotor of the steam turbine and the expansion amount of the rotor of the generator are comprehensively considered, and the deviation is adjusted by moving the front and back positions of the stator.

The invention further adopts the technical scheme that: the rotor disc-moving limiting plates in the step (8) are T-shaped steel plates, 3mm brazing is overlaid on two sides of each limiting plate, and one brazing part of each side limiting plate is contacted with a rotor end coupler; the generator bearing is an end cover type support, in the shafting adjustment process, the gaskets are added and subtracted between the generator and the bedplate for adjustment when the opening and circumference adjustment amounts of the upper end face and the lower end face are small, and the gaskets are added and subtracted for comprehensive adjustment between the generator and the bedplate and between the bedplate and the cement cushion block when the adjustment amount is large, so that the low-voltage rotor and the generator coupling are kept parallel and concentric, and neither opening nor height difference is reserved; the upper end face opening of the low-pressure A, B rotor coupler is reserved by 0.24mm, the electric end coupler of the low-pressure A rotor is reserved by 0.05mm in height difference than the end-adjusting coupler of the low-pressure B cylinder rotor, the center of the middle-low coupler is adjusted after the center of the A, B rotor coupler is adjusted, the center of the low-pressure A coupler is 0.67mm higher than the electric end coupler of the middle-pressure rotor, the end face opening is kept parallel, the end face opening is not reserved between the high-pressure rotor and the middle-pressure rotor coupler, and the height difference of the high-pressure rotor coupler is reserved by 0.24mm than the middle-pressure side coupler.

The further technical scheme of the invention is that the specific process of measuring and adjusting the center of the partition plate, the radial clearance of the steam seal and the axial clearance of the through flow in the step (9) is as follows:

a. measuring and adjusting the center of the partition board, namely after the spacer bush is assembled, adopting a hoisting true rotor to find the center of the partition board, measuring and adjusting the center of the partition board, measuring the bottom data of the center of the partition board by adopting a wedge-shaped lead block, and measuring the left and right by adopting a chock and a chock ruler;

b. and (3) measuring and adjusting radial clearance of the steam seal: the measuring of the gaps between the two sides of the middle split surface is carried out by a feeler gauge, the upper and lower gaps are checked by a lead pressing method, and the gap of the whole circle of the gland ring is rechecked by an adhesive tape method after the measuring and adjusting of the radial gap of the gland is finished;

c. through-flow axial gap measurement: positioning according to the axial distance K value between the first-stage separator of the cylinder and the first-stage movable vane of the rotor, and checking the axial gaps between the front part and the rear part and between the inner part and the outer part of each stage by using an electronic wedge-shaped feeler gauge; the axial clearance of the through flow is measured twice, and the rotor rotates 90 degrees after the first measurement and then the second measurement is performed.

The specific process of the step (10) in the further technical scheme of the invention is as follows:

a. checking the lower connecting pipelines to be connected to the cylinder before the cylinder is buckled, checking the buckling of the internal parts after the internal parts are fully assembled before the formal buckling of the turbine, comprehensively checking the matching condition of the parts in the cylinder, and then buckling the cylinder according to the sequence of buckling the low-pressure cylinder A, B and buckling the medium-pressure cylinder;

b. And (3) secondary irrigation and maintenance of the foundation: roughening the concrete contacted with the secondary pouring layer, purging, removing paint, greasy dirt and sundries, soaking the concrete surface for more than 24 hours by water, cleaning the surface of a bedplate, and manufacturing a low-pressure cylinder secondary pouring inner baffle plate to start secondary pouring, wherein the secondary pouring of the foundation is performed according to the pouring requirement of a cement cushion block;

c. and (5) shafting center review: after the secondary watering of the foundation reaches the maintenance period and the secondary watering intensity is checked to be qualified, rechecking the center of the shafting coupler of the turbogenerator in a shafting coupler centering mode, wherein the rechecked value meets the requirement of a shafting centering diagram and is checked to be qualified;

d. the shaft system coupling is connected, namely a low-pressure B cylinder rotor is taken as a reference to be respectively carried out towards two ends, a jack is used for jacking the rotor coupling at one side, so that the two couplings are vertically and horizontally aligned, the end faces of the couplings are folded by a process guide pin, bolts are used for temporary fastening, the staggered hole quantity of the bolt holes is checked, staggered holes are adjusted to enable all holes of the couplings to be concentric, and the excircle shaking degree of the couplings is adjusted to meet the requirement; when the formal bolts are used for coupling fastening of the coupler, the coupler is fastened in a symmetrical mode in the diameter direction, an electric hydraulic torque wrench is used, and torque fastening is adjusted by referring to the cold tightening torque value provided by a manufacturer; after fastening, measuring the length of the bolt by using a micrometer, wherein the elongation after the bolt fastening is calculated to be in accordance with the requirements of manufacturers, and after the fastening of the formal coupling bolt is finished, retesting the excircle shaking degree of the coupling is in accordance with the requirements; and the coupling of the couplers is completed in turn.

The utility model discloses a multipurpose micro-distance high-precision adjusting tool which is disclosed in Chinese patent application No. 2019212079436 and comprises a base, an adjusting screw rod and a supporting ball, wherein the base is in a round table shape with large upper and lower parts, an adjusting screw hole is formed in the middle of the round table base, the lower end of the adjusting screw rod is embedded into the adjusting screw hole of the base and is in threaded connection with the adjusting screw hole, a spherical or arc-shaped groove is formed in the top end of the adjusting screw rod, the supporting ball is embedded into the groove and is in rotary connection with the groove, the diameter of the supporting ball is larger than the depth of the groove, the arc-shaped surface of the supporting ball is higher than the groove after the supporting ball is embedded into the groove, and a gasket is arranged at the connecting part of the notch of the groove and the supporting ball.

The utility model discloses a rotor centering detection tool suitable for steam turbines of different models, which is characterized in that the detection tool comprises an axial adjusting screw, a radial adjusting screw, an axial dial indicator, a radial dial indicator, a conical locating block, a 7-shaped dial indicator bracket and a plurality of oblique iron cushion blocks, wherein the conical locating block is fixedly sleeved on the axial adjusting screw, locking washers and locking nuts are respectively arranged at two ends of the conical locating block, a plurality of cushion block slots are axially formed in the outer surface of the conical locating block along the locating block, and when the axial adjusting screw is inserted into a pair wheel bolt hole, the oblique iron cushion blocks are correspondingly inserted into each cushion block slot on the conical locating block and clamp the conical locating block and the pair wheel bolt hole.

The invention has the beneficial effects that:

(1) The cement cushion block is poured by adopting a special diversion trench with a defoaming strip and a special die box for pouring the cement cushion block in a matched manner; the optimal gradient of the diversion trench is designed, and a plurality of defoaming bars are arranged at the bottom of the diversion trench to play a role in reducing speed and disturbing so as to achieve defoaming, so that grouting material bubbles in the pouring process are fully defoamed and released, impurity bubbles in a cement cushion block are avoided, and the pouring quality is greatly improved; the special mould box bears the fixed shaping effect before the cement cushion block is solidified, and cement grouting material overflows from the high side pouring low side of the mould box, so that the cement cushion block is ensured to be poured compactly and has no bubble.

(2) According to the invention, the grouting castable is prepared according to the casting requirement and the special water-material ratio, the optimal water temperature is set, and then the grouting castable is stirred according to a special mode, so that the occurrence of bubbles is reduced from the preparation of the slurry; and two layers of casting are carried out during casting, the casting quality is ensured, and a special casting tool is matched to achieve the one-time qualification of casting the cement cushion block.

(3) The invention adopts a self-made multipurpose micro-distance high-precision adjusting tool to precisely control the longitudinal lifting degree and the transverse levelness of each bedplate and the bearing seat; the self-made spherical bearing bush limit grinding tool is adopted, so that the axial position of the bearing bush is not changed during grinding, the ground bearing bush is lifted into a rotor for checking, the gap between the bearing bush and the bearing bush is uniform, and the bearing bush is in good contact.

(4) The invention adopts the self-made rotor disc moving limiting device and the special fixed and firm detection tool for centering the wheel to measure and adjust the center of the shaft coupling among the rotors of the shaft system, the rotor disc moving limiting device relatively fixes the axial position of the rotor when the disc moves, the rigidity of the detection tool for centering the wheel is good, the measurement data is accurate when the shaft coupling is centered, the actual condition of the shaft coupling can be truly reflected, and the shaft coupling is adjusted according to the measurement data, so the reliability is high.

Aiming at the installation characteristics of the 1000 MW-level steam turbine generator unit shafting, the special tool for measuring and adjusting is optimized, and a plurality of special tools and optimized installation process methods suitable for the installation of the shafting of the type of the unit are self-developed, so that the shafting installation time is greatly shortened, the installation quality is reliable, and the generator unit can stably operate.

Drawings

FIG. 1 is a schematic front view of a cement block casting mold of the present invention;

FIG. 2 is a top view of a cement block casting mold of the present invention;

FIG. 3 is a top view of a flow guide groove in the present invention;

FIG. 4 is a schematic diagram of the front structure of the diversion trench of the present invention;

FIG. 5 is a schematic illustration of cement pad casting in accordance with the present invention;

FIG. 6 is a schematic view of the installation of a bearing shell grinding limit tool and a spherical bearing shell of the present invention;

FIG. 7 is a view of the use of the shoe grinding spacing tool of the present invention;

FIGS. 8 to 11 are views showing a process of moving through a rotor according to the present invention;

FIG. 12 is a schematic diagram of a turbo-generator set shaft system alignment according to the present invention;

FIG. 13 is a schematic illustration of the axial spacing of the rotor of the generator set of the present invention;

FIG. 14 is a schematic illustration of a generator set rotor system of the present invention.

In the figure: 1-platen, 2-grouting die box, 3-overflow die box, 4-pouring space, 5-guiding groove support, 6-guiding groove, 7-defoaming baffle bar, 8-limit channel steel, 9-spherical bearing bush body, 10-fastening bolt, 11-limit bolt, 12-bearing bush sleeve, 13-stator, 14-slide plate assembly, 15-motor rotor, 16-support slide block, 17-hoisting crane, 18-temporary support, 19-lower end cover, 20-front bearing box base frame, 21-high and medium pressure bearing box base frame, 22-medium and low pressure bearing box base frame, 23-low pressure base frame, 24-generator base frame, 25-rotor disc movement limiting plate, 26-brazing, 27-coupling and 28-rotor coupling centering detection tool.

Detailed Description

The invention is further described below with reference to the drawings and examples. Fig. 1 to 14 are drawings of embodiments, which are drawn in a simplified manner, for the purpose of clearly and concisely illustrating embodiments of the present invention. The following technical solutions presented in the drawings are specific to embodiments of the present invention and are not intended to limit the scope of the claimed invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships conventionally put in place when the inventive product is used, or the directions or positional relationships conventionally understood by those skilled in the art are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in a specific direction, and therefore should not be construed as limiting the present invention. In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, terms such as "disposed," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

The invention provides a 1000 MW-level steam turbine generator unit shafting construction process flow, which specifically comprises the following steps: preparation before construction, foundation acceptance, platen positioning and elevation adjustment, cement cushion block formwork and pouring, cylinder and bearing seat positioning (generator stator hoisting and end cover positioning) and bearing bush preliminary grinding, rotor positioning and preliminary centering, baffle plate center adjustment, gland sealing clearance and through-flow clearance adjustment (generator air clearance adjustment), cylinder buckle cover, shafting center rechecking, foundation secondary pouring, maintenance and shafting center rechecking, shafting coupling acceptance.

In the construction step of the invention, a plurality of self-created tools are used, wherein in the cement cushion block pouring process, a special die box and a diversion trench are used, the die box structure is shown in the specific figures 1 and 2, and comprises a grouting die box 2 higher than a platen 1 and a slurry overflow die box 3 lower than the platen 1, and a pouring space 4 is formed at the bottom of the platen by the two die boxes; the flow guide groove is shown in fig. 3 and 4 and comprises a flow guide groove bracket 5 and a concave flow guide groove body 6, wherein the flow guide groove body is fixed on the flow guide groove bracket 5 in a 45-degree inclined mode, a feed inlet of the flow guide groove body faces upwards, a discharge outlet of the flow guide groove body faces downwards and faces to an injection inlet of a grouting mouth die box 2, a plurality of defoaming baffle strips 7 are uniformly arranged at the bottom of the flow guide groove body 6, the height of each defoaming baffle strip is 12-15 mm, the width is 14-20 mm, the length is equal to the width of the bottom of the flow guide groove body, and the distance between every two adjacent defoaming baffle strips is 90-110 mm.

In the embodiment, the spherical bearing bush grinding limiting tool has a specific structure as shown in fig. 6 and 7, and comprises two limiting channel steels, wherein the two limiting channel steels are fixed on two sides of a spherical bearing bush body 9 through fastening bolts 10, two limiting bolts 11 are symmetrically arranged on the limiting channel steels on two sides, and after a bearing bush is installed on a bearing bush sleeve 12, the limiting bolts 11 are adjusted to enable screw heads of the limiting bolts to be in contact with the bearing bush sleeve 12 for limiting. The rotor disc movement limiting plates 25 in the embodiment are T-shaped steel plates, as shown in fig. 13, wherein the two sides of each limiting plate are subjected to 3mm brazing in a surfacing mode, and one brazing part of each side limiting plate is in contact with a rotor end coupler.

The micro-distance high-precision adjusting tool in the embodiment adopts a multipurpose micro-distance high-precision adjusting tool disclosed in Chinese utility model patent with the patent number of 2019212079436; the rotor coupler centering detection tool in the embodiment adopts a rotor pair wheel centering detection tool suitable for turbines of different types disclosed in Chinese utility model patent No. 2017213899819.

Aiming at the installation of a three-period project 2X 1000MW ultra-supercritical unit #5 shafting of a Hubei energy source Hubei power plant, the 1000MW steam turbine generator unit adopts a five-rotor eleven-bearing bush support mode (an excitation brush frame bearing is a stable bearing), the installation of a multi-support long shafting is difficult, but plays a key role in the stable operation of the unit, the inventor of the application prefers a special measuring and adjusting tool aiming at the installation characteristics of the 1000MW steam turbine generator unit shafting, and self-develops a plurality of special tools and an optimized installation process method suitable for the installation of the type of unit shafting, so that the shafting installation time is greatly shortened, the installation quality is reliable, and the specific installation steps are as follows:

(1) Elevation adjustment and installation of the bedplate; after the foundation is accepted, the positions of the central axis, elevation and condenser center of the turbo generator set are determined to be correct, the central axis of the turbo generator set is marked by a drawing steel wire, the position of a bedplate is determined by taking the central axis as a reference, the level of the bedplate is adjusted by an adjusting screw carried on the bedplate, the longitudinal lifting degree and the transverse levelness of the bedplate and a bearing seat are accurately adjusted by a micro-distance high-precision adjusting tool, the bedplate is located at the center of a bearing bush by matching with a high-precision level gauge and an imaging level gauge, the elevation of each bedplate is accurately controlled within 0.02mm by using the high-precision level gauge, and then the bedplate is fixed by fastening foundation bolts.

(2) Pouring a cement cushion block at the bottom of the bedplate;

(1) firstly, roughening the surface of a concrete foundation, removing chiseling scraps, dust and the like from the surface of the concrete foundation after roughening, and cleaning the surface; calculating the detailed size of the corresponding die box of each cushion block according to the position mark of the cushion block and the distance between the basic surface and the bedplate;

(2) after the surface of the concrete foundation is cleaned, supporting a corresponding mould box according to the paying-off position of the cushion block, wherein the supporting of the mould box is shown in fig. 1 and 2, the mould box is firmly installed, all gaps are required to be sealed, and cement mortar (or foam rubber) is sealed from the outer side of the mould box to prevent leakage;

(3) And (3) grouting material preparation: selecting MF-870G grouting material, stirring the grouting material with warm water at 30+/-1 ℃, wherein the optimal mixing ratio (the ratio of the grouting material to the water is 3.5L-3.75L of the grouting material per 25 KG) is that the grouting material is stirred uniformly, specifically, the stirring is performed by adopting a hand-held mixing blade rotary stirrer, during stirring, 80% of the total water is firstly added into a container, then the total grouting material is slowly added, after stirring for 2-3 minutes, the water with the remaining 20% is added until the grouting material is fully and uniformly stirred, and the time from stirring to filling is controlled within 20 minutes until most of bubbles overflow; the water temperature of grouting material stirring is adjusted according to a relation graph between the grouting material temperature and the water temperature provided by a manufacturer, and the relation graph is obtained through experiments, purified water is heated by using a hot water kettle, the temperature is detected by using a thermometer, and the error is controlled to be +/-1 ℃;

(3) pouring grouting materials: pouring grouting material in two layers, pouring the second layer after 20-40 minutes after pouring the first layer, wherein a gap between the surface of the first layer and the bottom surface of the grouting template is about 30-40 mm; the special diversion trench with the defoaming strip is used for casting, so that air in the slurry is uniformly and rapidly discharged, grouting material overflows from a high-side grouting orifice die box for casting a low-side grouting orifice die box, and the cement cushion block is tightly cast without bubbles in the casting process;

(4) And (3) maintaining a cement cushion block: and (3) wrapping mortar on the pouring gate and the overflow outlet which are exposed in the air by wet cloth for maintenance, curing for 3 days at the temperature of 10-35 ℃, and then removing the template to finish the pouring work of the cement cushion block.

(3) The low-pressure cylinder and the bearing seat are positioned: the low-pressure cylinder comprises a low-pressure cylinder A and a low-pressure cylinder B, a low-pressure outer cylinder combination adopts a construction scheme of directly horizontally combining on a bedplate, the low-pressure outer cylinder combination is hung into cylinders at the two ends of the lower half of the cylinder, sealing dressings are coated on the vertical flange surfaces for formal assembly, and bolts and positioning pins are spot-welded after all bolts are fastened; after the low-pressure cylinder is combined in place, the low-pressure cylinder is aligned and leveled according to the longitudinal and transverse central lines and elevation requirements of the foundation, so that the horizontal and longitudinal lifting degrees of the cylinder meet the drawing requirements; and then, each bearing seat is sequentially positioned, the bearing seat is initially found according to the longitudinal and transverse central lines of the foundation and the elevation requirement of the shaft system finding map, the elevation and the horizontal lifting degree of each bearing seat are adjusted to meet the design requirement, the transverse horizontal deviation of the bearing seat is not more than 0.20mm/m, and the longitudinal lifting degree is consistent with the lifting degree of the shaft neck of the rotor.

(4) Grinding of the low-pressure cylinder bearing bush: after the bearing seat is in place and the rechecking elevation, the longitudinal lifting degree and the transverse levelness are adjusted, the bearing bush grinding is carried out, and when the bearing bush grinding is carried out, the bearing bush grinding limiting tool is used for limiting the bearing bush grinding, so that the bearing bush grinding can rotate in a fixed circumference track when being pried in a small range, the inclination caused by rotation in any direction is avoided, the axial position is not changed, the bearing bush is lifted into a rotor for checking after being ground, the gap between the bearing bush and the bearing bush is uniform, and the bearing bush is in good contact.

(5) Lifting a generator stator and lifting a high-pressure cylinder: the generator stator and the high-pressure cylinder are hoisted in place by adopting two travelling crane and a shoulder pole Liang Jiaye pressure hoisting device, a generator end cover is arranged after the generator stator is hoisted in place, and a generator bearing bush is subjected to limit grinding in the step (4); the high-pressure cylinder is integrally hoisted, support conversion is carried out after the high-pressure cylinder is in place, the bearing bush supports the rotor, the bearing seat cat claw supports the cylinder, and the low-pressure cylinder and the high-pressure cylinder are adjusted in horizontal and shafting lifting degree after the high-pressure cylinder is in place; the low-pressure cylinder comprises a low-pressure cylinder A and a low-pressure cylinder B, the low-pressure cylinder A is horizontally adjusted to be horizontally and basically kept to be slightly higher towards the side of the boiler, the longitudinal horizontal adjusting end is higher than the electric end, the design requires the low-pressure rotor journal to be horizontally arranged, the journal is lifted by 0.15mm/m in the actual arrangement, and the journal is lifted by 0.13mm/m in the backward direction of the #5 journal. The method comprises the steps of carrying out a first treatment on the surface of the The low-pressure B cylinder is adjusted to be basically kept horizontal and slightly higher to the side of the boiler, the longitudinal horizontal electric end is higher than the adjusting end, the lifting degree is actually configured, the lifting degree of the #8 journal is 0.15mm/m, and the lifting degree of the #7 journal is 0.13mm/m.

(6) Penetrating through a generator rotor: the rotor is penetrated by adopting a crane matching sliding method, as shown in fig. 8 to 11, an arc plastic plate, a rubber pad and an arc steel sliding plate are sequentially installed in a stator inner bore to form a sliding plate assembly, then paraffin wax is used for bottoming the inner surface of the arc steel sliding plate, a lubricant is coated, finally the generator rotor is matched with an arc supporting sliding block installed at the bottom of the motor rotor and crane lifting to slide and penetrate the stator inner bore.

(7) Air gap between generator rotor and stator: the rotor is marked at 90-degree intervals according to the up-down, left-right, and the rotor is moved according to the steering wheel when in operation, the marking point which is turned to 90 degrees is stopped, the gap between the stator and the rotor at the front end, the rear end, the up-down, left-right and the stator of the generator is measured, the deviation is not more than 10% of the average value, if the deviation is the spherical gasket of the adjusting bearing bush, the air gap meets the design requirement, and the air gap of the generator is uniform.

(8) Measurement and adjustment of magnetic force center: the allowable deviation of the magnetic force center of the generator is not more than 1.0mm, the total expansion of each rotor of the steam turbine and the expansion of the rotor of the generator are comprehensively considered during measurement, and if the allowable deviation exists, the front and back positions of the movable stator are adjusted.

(9) And (5) shaft system centering: after the generator penetrates through the rotor, the generator air gap is adjusted, and then the low-power-generation coupling is found, the generator bearing is supported by the end cover, the opening of the upper end face and the lower end face and the circumferential adjustment amount are small, the gasket is only added and subtracted to the generator and the bedplate, the gasket is also added and subtracted to the bedplate and the cement cushion block to comprehensively adjust when the adjustment amount is large, the left opening, the right opening and the circumferential center are adjusted, the low-voltage rotor and the generator coupling are kept parallel and concentric, and neither opening nor height difference is reserved. The center of the shaft system is adjusted according to the requirement of the shaft system centering diagram in FIG. 12, other rotors are adjusted by taking a low-pressure B cylinder rotor as a shaft system reference, an upper end face opening of 0.24mm is reserved in a low-pressure A, B rotor coupler, and a height difference of 0.05mm is reserved in a low-pressure A rotor electric end coupler compared with a low-pressure B cylinder rotor end adjusting coupler; the center of the middle-low coupler is adjusted at the center of the A, B rotor coupler, the center of the designed low-voltage A coupler is 0.67mm higher than the center of the middle-voltage rotor electric end coupler, and the end faces are parallel. The end face opening is not reserved between the high-pressure rotor and the medium-pressure rotor coupler, and the high-pressure rotor coupler is reserved for a height difference of 0.24mm compared with the medium-pressure side coupler. When the actual shaft system is centered, a rotor disc is adopted to move a limiting plate for limiting (shown in fig. 13), and a rotor coupler centering detection tool (shown in fig. 14) is adopted to measure and adjust the coupler centers among the rotors of the shaft system; the rotor axial position is relatively fixed when the rotor disc moves by the rotor disc moving limiting plate, the rigidity of the rotor coupler centering detection tool is good, the measured data is accurate when the coupler is centered, the actual condition of the coupler can be truly reflected, and the rotor coupler centering detection tool is adjusted according to the measured data, so that the reliability is high.

(10) Baffle center adjustment, gland gap and through-flow gap adjustment

a. And (3) separating a partition plate: assembling a partition plate (sleeve) and centering the partition plate, wherein in order to ensure the accuracy of data in the center of the partition plate and reduce the steam seal gap adjustment amount in the subsequent process, the center of the partition plate is centered by hoisting a true rotor, the bottom data in the center of the partition plate is measured by using a wedge-shaped lead block, and the left and right of the partition plate are measured by using a chock and a chock gauge;

b. steam seal radial clearance measurement: the steam seal clearance at the two sides of the bisection surface is measured by a feeler gauge; checking the upper and lower gaps by adopting a lead wire pressing method; and (5) after the steam seal clearance measurement and adjustment are finished, rechecking by using an adhesive tape method. The lead wire pressing method is to wedge a back clearance at the back of a shoulder of each arc section of the steam seal ring into a wooden wedge for plugging, and plug both sides of each section, wherein each section is plugged with two ends only, the lead wire is stuck on the steam seal arc section (the lead wire direction is along the axial direction, the diameter of the lead wire is generally 0.5mm larger than the clearance value), the horizontal middle section is not stuck (measured by a feeler gauge), the steam seal of each section is smooth and excessive, and if the steam seal of each section is misplaced, the two sections are measured respectively. Putting a rotor to measure the thickness of the lead wire at the lead wire stamping position and recording, if the lead wire is unqualified, trimming, and rechecking the whole circle of gap of the gland seal ring by a rubberized cloth method after the radial gap is qualified;

c. Through-flow axial gap measurement: and (3) positioning according to the axial distance K value between the first-stage partition plate of the cylinder and the first-stage movable blade of the rotor, and checking the axial gaps between the front part and the rear part and between the inside and the outside part of each stage by using an electronic wedge-shaped feeler gauge. The axial clearance of the through flow is measured twice, and the rotor rotates 90 degrees after the first measurement and then the second measurement is performed. When the rotor is required to be driven during radial steam seal gap measurement and through-flow axial gap measurement, a rotor disc driving limiting device is adopted to relatively fix the axial position of the rotor so as to reduce measurement errors;

(11) Cylinder buckle closure: before the cover is buckled, all connecting pipelines at the lower part are firstly checked and connected to the cylinder, before the main cover of the steam turbine is formally buckled, the internal parts are fully assembled and then are tested for buckling, the matching condition of the parts in the cylinder is comprehensively checked, then the low-pressure cylinder A, B is snapped, and the middle-pressure cylinder is buckled in sequence.

(12) And (3) secondary irrigation and maintenance of the foundation: after centering of the shaft coupling is completed before secondary pouring of the foundation, roughening the concrete contacted with the secondary pouring layer, purging, removing paint, greasy dirt and sundries, and soaking the surface of the concrete for more than 24 hours by water; cleaning the surface of the bedplate, and avoiding paint and greasy dirt; and (5) manufacturing the inner baffle plate for secondary irrigation of the low-pressure cylinder. The secondary pouring of the foundation is carried out according to the pouring requirement of the cement cushion block, and the proportion of grouting material and water, the water temperature, the stirring mode and the stirring time, the pouring speed, the pouring direction, the curing time after pouring and the curing mode are strictly controlled.

(13) And (5) shafting center review: after the secondary irrigation of the foundation reaches the maintenance period and the secondary irrigation strength is checked to be qualified, rechecking the center of the shafting coupler of the turbogenerator in a shafting coupler centering mode, wherein the rechecked value accords with the requirement in a shafting centering diagram and the experience is checked to be qualified; and each rotor is positioned according to the K value, and the average gap of the end faces of the couplings is measured to configure gaskets between the couplings.

(13) And (3) shaft coupling connection: the method comprises the steps of respectively carrying out the operation towards two ends by taking a low-pressure B cylinder rotor as a reference, taking a gap and a height difference reserved between the couplings into consideration, jacking up the rotor couplings at one side by using a jack, aligning the two couplings up and down and left and right, and folding the end faces of the couplings by using a technical guide pin; temporarily fastening by using a temporary bolt, checking the staggered hole quantity of the bolt hole, and adjusting the staggered holes to enable all holes of the coupler to be concentric; and (3) according to the actual measurement of the diameter of each hole of the coupler bolt, weighing the coupler bolt by using a balance scale before installation, wherein the weight difference of the two bolts and nuts with symmetrical weight in the diameter direction of the bolt is less than 5 g. The coupling is fastened by a temporary bolt, the outer circle shaking degree of the coupling is adjusted to meet the requirement, concentricity measurement is carried out before and after coupling of the coupling, and the symmetrical position difference is smaller than 0.025mm. The method is characterized in that the formal bolts are symmetrically fastened in the diameter direction during connection and fastening, an electric hydraulic torque wrench is adopted, and torque fastening is adjusted by referring to a cold tightening torque value provided by a manufacturer; after fastening, the length of the bolt is measured by a micrometer, compared with the original value, the elongation after fastening the bolt is calculated to meet the requirements of manufacturers, and the cold-fastening elongation of the coupler bolt is used as main control and torque auxiliary control. Four formal coupling bolts are symmetrically fastened, and the excircle degree of the retested coupling meets the requirement; and sequentially completing the connection of the couplers.

Aiming at the installation of a 2X 1000MW ultra-supercritical unit #5 unit shafting of a three-period project of a Hubei energy source Hubei power plant, the invention improves the installation quality of the unit shafting by a series of construction measures such as the installation quality control of a unit foundation cement cushion block, the installation of a shafting rotor spherical cushion block, the accurate adjustment of a steam seal gap and a through flow gap, the control of a shafting center and the like, thereby greatly improving the running stability of the unit. And in the #5 unit, all bearing bushes vibrate well when running at full load of 1000MW, the maximum vibration is not more than 40 mu m, and the vibration fine standard of the bearing bushes, which is greatly superior to the national power industry code specification, is less than or equal to 75 mu m. The continuous and stable operation of the unit exceeds 100 days after the unit is put into operation, so that the construction cost is greatly reduced, the temporary system installation time is saved, and the economic benefit is indirectly improved.

The foregoing description is of one embodiment of the invention and is thus not to be taken as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.

Claims

1. The method for installing the 1000 MW-level steam turbine generator unit multi-support long shafting is characterized by comprising the following specific steps:

(1) Elevation adjustment and installation of the bedplate: after the foundation is accepted, determining a central axis of the steam turbine generator unit, drawing a steel wire to mark the central axis of the steam turbine generator unit, determining the position of a bedplate by taking the central axis as a reference, adjusting the level of the bedplate by utilizing an adjusting screw carried on the bedplate, enabling the bedplate to be at the center of a bearing bush by matching a micro-distance high-precision adjusting tool with a high-precision level gauge and an image-combining level gauge, accurately controlling the elevation of each bedplate to be within 0.02mm by using the high-precision level gauge, and then fastening foundation bolts to fix the bedplate; pouring a cement cushion block at the bottom of the bedplate: the two sides of the bedplate are respectively provided with a mould box for pouring the cement cushion block at the bottom of the bedplate; the die boxes comprise a grouting die box higher than the platen and a slurry overflow die box lower than the platen, and the two die boxes form a pouring space at the bottom of the platen; the grouting material pouring method comprises the steps that grouting material pouring is carried out by using a diversion trench with a plurality of defoaming bars arranged at the bottom, the diversion trench comprises a diversion trench support and a concave diversion trench body, the diversion trench body is fixed on the diversion trench support in a 45-degree inclined manner, a feeding hole of the diversion trench body faces upwards, a discharging hole of the diversion trench body faces downwards and faces to an injection hole of a grouting hole die box, a plurality of defoaming blocking bars are uniformly arranged at the bottom of the diversion trench body, the height of each defoaming blocking bar is 12-15 mm, the width of each defoaming blocking bar is 14-20 mm, the length of each defoaming blocking bar is equal to the width of the bottom of the diversion trench body, and the distance between every two adjacent defoaming blocking bars is 90-110 mm; the grouting material overflows from a high-side grouting orifice die box, the grouting material ensures that the cement cushion block is poured tightly without bubbles in the pouring process, after the grouting material is poured, the pouring orifice and the overflow outlet of the die box are wrapped by wet cloth, the grouting material is maintained for 3-4 days at the temperature of 10-35 ℃, and then the template is disassembled to complete the pouring work of the cement cushion block;

(4) Grinding of the low-pressure cylinder bearing bush: after the bearing seat is in place and the rechecking elevation, the longitudinal lifting degree and the transverse levelness are adjusted, bearing bush grinding is carried out, and when the bearing bush grinding is carried out, the bearing bush grinding limiting tool is used for axially limiting the bearing bush grinding, so that the bearing bush grinding can rotate in a fixed circumferential track when being pried in a small amplitude, and deflection caused by rotation in any direction is avoided; the bearing bush grinding and limiting tool comprises two limiting channel steels, wherein the two limiting channel steels are fixed on two sides of a spherical bearing bush body through fastening bolts, two limiting bolts are symmetrically arranged on the limiting channel steels on two sides, and after a bearing bush is arranged on a bearing bush sleeve, the limiting bolts are adjusted to enable the screw heads of the limiting bolts to be in contact with the bearing bush sleeve for limiting;

(5) Hoisting a generator stator and a high-pressure cylinder: installing a generator end cover after the generator stator is hoisted in place, and carrying out limit grinding on a generator bearing bush in the mode of the step (4); the generator stator and the high-pressure cylinder are hoisted in place by adopting two travelling crane and a shoulder pole Liang Jiaye pressure hoisting device, the high-pressure cylinder is integrally hoisted, support conversion is carried out after the high-pressure cylinder is in place, the rotor is supported by the bearing bush, the cylinder is supported by the bearing pedestal cat claw, and the low-pressure cylinder and the high-pressure cylinder are adjusted in horizontal and shafting lifting degrees after the high-pressure cylinder is in place; the low-pressure cylinder comprises a low-pressure cylinder A and a low-pressure cylinder B, wherein the low-pressure cylinder A is horizontally adjusted to be basically horizontally and slightly higher towards the side of the boiler, and the longitudinal horizontal adjusting end is higher than the electric end; the low-pressure B cylinder is adjusted to be basically kept horizontal and slightly higher to the side of the boiler, and the longitudinal horizontal electric end is higher than the adjusting end;

(6) Penetrating through a generator rotor: a crane is matched with a sliding method to penetrate through a generator rotor, a sliding plate assembly is arranged in a stator bore of the generator, the generator rotor is hoisted and penetrates into the stator bore through sliding of a supporting sliding block, the generator rotor slides to the limit of a crane lifting point to convert the crane lifting point to the tail, finally the generator rotor slides to a formal positioning position, the supporting sliding block is removed, and an end cover is installed to formally position the generator;

(8) And (5) shaft system centering: the method comprises the steps of taking a designed shaft system centering diagram as an adjustment standard, firstly positioning a low-pressure B cylinder rotor, respectively fixing rotor disc moving limiting plates which enable the rotor not to move forwards and backwards in the rotating process at two ends of the low-pressure B cylinder rotor, and then measuring and adjusting the center of a shaft system between the rotors by taking the low-pressure B cylinder rotor as a shaft system reference and matching with a rotor shaft system centering detection tool; the rotor disc-moving limiting plates in the step (8) are T-shaped steel plates, 3mm brazing is overlaid on two sides of each limiting plate, and one brazing part of each side limiting plate is contacted with a rotor end coupler;

2. The method for installing a multi-support long shafting of a 1000 MW-level steam turbine generator unit according to claim 1, wherein the method comprises the following steps: before the cement cushion block is poured in the step (2), removing cuttings and dust on the surface of a concrete foundation, cleaning, supporting corresponding mold boxes according to the paying-off positions of the cushion blocks, sealing the gaps of the mold boxes, and sealing the mold boxes from the outer sides of the mold boxes by cement mortar or foam glue to prevent slurry leakage; the grouting material of the pouring cement cushion block adopts MF-870G grouting material, the grouting material adopts warm water with the temperature of 30+/-1 ℃ to stir, 3.5L-3.75L of water is added into each 25KG grouting material, a hand-held mixing blade rotary stirrer is adopted to stir uniformly, 80% of the total water is firstly added into a container during stirring, then the total grouting material is slowly added, after stirring for 2-3 minutes, the water with the concentration of 20% is added until the grouting material is fully and uniformly stirred, and the air bubbles are overflowed for a large part, so that the time from stirring to pouring is controlled within 20 minutes; and during casting, the diversion trenches are adopted to cast in two layers, the casting of the second layer is performed after 20-40 minutes of the casting of the first layer, and the gap between the surface of the first layer and the bottom surface of the grouting template is 30-40 mm.

3. The method for installing a multi-support long shafting of a 1000 MW-level steam turbine generator unit according to claim 1, wherein the method comprises the following steps: when the generator rotor is penetrated in the step (6), firstly, an arc plastic plate, a rubber pad and an arc steel sliding plate are sequentially installed in the stator inner bore to form a sliding plate assembly, then, paraffin is used for priming the inner surface of the arc steel sliding plate, then, a lubricant is coated, and finally, the generator rotor is slipped into the stator inner bore by matching with an arc supporting sliding block installed at the bottom of the motor rotor and a crane hoist.

4. The method for installing a multi-support long shafting of a 1000 MW-level steam turbine generator unit according to claim 1, wherein the method comprises the following steps: the air gap adjusting process of the generator rotor and the stator in the step (7) is that the generator rotor is marked at 90-degree intervals according to the up-down and left-right positions, the rotor is moved according to a steering wheel during operation, the rotor is stopped at the 90-degree mark point, the up-down and left-right gaps between the stator and the rotor at the front and rear ends of the generator are measured, and when the gaps exceed 10% of the average value, the spherical gasket of the adjusting bearing bush is adopted to enable the air gap to meet the design requirement, and the air gap of the generator is uniform; when the magnetic force center of the generator is measured, the total expansion amount of each rotor of the steam turbine and the expansion amount of the rotor of the generator are comprehensively considered, and the deviation is adjusted by moving the front and back positions of the stator.

5. The method for installing a multi-support long shafting of a 1000 MW-level steam turbine generator unit according to claim 1, wherein the method comprises the following steps: the generator bearing in the step (8) is an end cover type support, in the shafting adjustment process, gaskets are added and subtracted between the generator and the bedplate for adjustment when the opening and circumference adjustment amounts of the upper end face and the lower end face are small, and when the adjustment amount is large, the gaskets are added and subtracted for comprehensive adjustment between the generator and the bedplate and between the bedplate and the cement cushion block, and the low-voltage rotor and the generator coupler are kept parallel and concentric, so that the opening is not reserved and the height difference is not reserved; the upper end face opening of the low-pressure A, B rotor coupler is reserved by 0.24mm, the electric end coupler of the low-pressure A rotor is reserved by 0.05mm in height difference than the end-adjusting coupler of the low-pressure B cylinder rotor, the center of the middle-low coupler is adjusted after the center of the A, B rotor coupler is adjusted, the center of the low-pressure A coupler is 0.67mm higher than the electric end coupler of the middle-pressure rotor, the end face opening is kept parallel, the end face opening is not reserved between the high-pressure rotor and the middle-pressure rotor coupler, and the height difference of the high-pressure rotor coupler is reserved by 0.24mm than the middle-pressure side coupler.

6. The method for installing the multi-support long shafting of the 1000 MW-level steam turbine generator unit according to claim 1, wherein the specific process of measuring and adjusting the center of the partition plate, the radial clearance of the steam seal and the axial clearance of the through flow in the step (9) is as follows:

7. The method for installing a multi-support long shafting of a 1000MW steam turbine generator unit according to claim 1, wherein the specific process of the step (10) is as follows: