CN114320501B

CN114320501B - Disassembly and installation process for steam turbine of chemical power station

Info

Publication number: CN114320501B
Application number: CN202111195604.2A
Authority: CN
Inventors: 刘海涛; 宫玉; 孙占忠
Original assignee: China National Chemical Engineering No14 Construction Co ltd
Current assignee: China National Chemical Engineering No14 Construction Co ltd
Priority date: 2021-10-11
Filing date: 2021-10-14
Publication date: 2024-03-01
Anticipated expiration: 2041-10-14
Also published as: CN114320501A

Abstract

The invention relates to a disassembly and installation process of a turbine in a chemical power station, which comprises the processing procedures of basic treatment of a turbine body installation matrix, assembling and transferring a bearing seat and a rotor, pre-assembling basic processing of a generator, assembling correction of the generator, debugging and preliminary detection after equipment assembling, and the like. The method has a high reference effect on the installation engineering of the same type of steam turbines.

Description

Disassembly and installation process for steam turbine of chemical power station

Technical Field

The invention belongs to the technical field of turbines, and particularly relates to a disassembly and installation process of a chemical power station turbine.

Background

Along with the development of science and technology, the performance of the steam turbine is more advanced, meanwhile, the structure of the steam turbine is more complex, and the operation environment is very harsh, so that various faults of the steam turbine are easy to occur, various damages and inconvenience are brought to the industry, and the development technology of the steam turbine in China can be effectively improved by researching the installation technology of the steam turbine; the turbine is a turbine type machine which converts heat energy into mechanical energy so as to drive the carrier to operate or drive the generator to generate electricity; that is, the steam generated from the boiler enters the steam turbine; converting heat energy into mechanical energy for rotating the turbine rotor through the related mechanical configuration and the movable blades; because of the operational specificity of the steam turbine, the process requirements on installation precision, jigger, oil circulation and the like are very high in the process of disassembly and installation; the disassembly and installation technology of the turbo generator set of a certain company is described, so that references are provided for other similar engineering constructions.

Disclosure of Invention

In order to solve the problems, the invention discloses a disassembly and installation process of a steam turbine of a chemical power station, which simplifies the installation operation, ensures the effectiveness of construction, has definite quality control point control steps and improves the assembly work efficiency.

In order to achieve the above purpose, the invention provides a disassembly and installation process of a chemical power station steam turbine, which comprises the following steps:

step one: a basic treatment procedure of a turbine body installation matrix;

(1) supplementing a cement foundation;

(2) limiting the aperture difference;

(3) completing the position of the identification embedded part according to the drawing;

(4) ensuring the cleanness in the foundation bolt hole, detecting the peripheral foundation condition of the embedded part, and coating cement mortar on the surface of the concrete;

(5) after the cement mortar is coated on the foundation for the second time, the foundation bolts are loaded with the reinforcing structure, so that the foundation bolts are ensured to have deformation resistance;

step two: assembling and transporting the bearing seat and the rotor;

(1) front and rear bearing supports are transported into position

(2) The cylinder is transported to be in place;

(3) the bearing support and the cylinder are first calibrated;

(4) hoisting and transporting the rotor to be in place;

(5) calibrating a rotor and a cylinder;

(6) assembling and adjusting the ventilation part;

(7) the upper cylinder and the lower cylinder are moved to be matched with the upper cylinder and the lower cylinder to be combined, and the lower cylinder is immovable after being installed;

(8) Detecting and repeatedly adjusting the centers of the rotor and the cylinder;

(9) assembling and ending the steam turbine, and secondarily grouting the steam turbine;

step three: a generator pre-assembly matrix basic processing and generator assembly correction procedure;

(1) positioning a generator bedplate;

(2) positioning a generator and primarily correcting;

(3) the correction center of the backrest wheel of the steam turbine;

(4) the backrest wheel corrects the center and completes the connecting procedure;

(5) secondary grouting of the generator;

step four: debugging and preliminary detection after equipment assembly;

(1) oil circulation flushing;

(2) and an external pipeline is connected.

In the first step, the elevation deviation of the basic surface is less than or equal to 10mm, the longitudinal and transverse central lines of the basic are mutually perpendicular, and the deviation between the longitudinal and transverse central lines of the basic and the datum line is less than or equal to 1mm/m; the center deviation of the bolt hole is less than or equal to 5mm, and the plumb error of the wall of the bolt hole is less than or equal to 1/1000 and less than or equal to 5mm; the embedded supporting bottom plate is supplemented, the condition that the interior of the foundation bolt hole is cleaned up and free of sundries is ensured, the embedded supporting bottom plate is slightly compressed by using the nut, so that mortar begins to be extruded, the long-term operation of a unit is facilitated, leakage of mortar during backfilling of the foundation bolt hole is prevented, the foundation bolt hole can be backfilled after 12 hours, and the strength of the backfilled mortar after 72 hours is ensured>60N/mm ² The method comprises the steps of carrying out a first treatment on the surface of the After secondary grouting, the asphalt adhesive tape is wound on the foundation bolt, the winding range is wound upwards from the position of the lower end nut to the upper screw tail, if the adhesive tape is thinner, multiple layers of adhesive tapes can be wound, and the winding direction is the same as the screwing direction of the nut, so that when the nut is screwed, the adhesive tape is pushed upwards to form a spherical hoop.

Further, the roughness of the upper surface of the bottom plate of the supporting bottom plate has the flatness deviation less than 0.1;

the sizing block is configured by adopting a flat sizing block 160 multiplied by 100 multiplied by 15mm and an inclined sizing block 150 multiplied by 90 multiplied by 17/10mm, the matched contact surfaces between the inclined sizing blocks are required to be uniformly contacted, the contact area is not less than 75%, the contact surfaces are required to be clean, and a polishing machine is adopted to polish the sizing block;

and taking the longitudinal and transverse central lines of the steam turbine generator unit as a reference, and the deviation of the positions of the embedded sizing blocks to the center of the screw hole is not more than 3mm.

In the second step, the front and rear bearing support positioning process comprises the steps of horizontally lifting the support and cleaning the bottom surface of the support; the bearing support is put down, so that all the adjusting screws are contacted with the base plate on the foundation;

dismantling the upper half of the bearing seat, and dismantling the radial bearing and the thrust bearing;

the center heights of the front support and the rear support meet the required heights through the adjusting screws of the bearing supports;

correcting the level of the support, and correcting the axial and transverse levels of the support by using an adjusting screw on the premise of keeping the central height unchanged, wherein the deviation is less than 0.06mm/m;

further, in the second step, the cylinder positioning process includes: hanging the lower half of the cylinder, placing a cylinder cat claw on a bearing support by means of a jacking screw, removing two pull rods at the front end of the cylinder before the lower cylinder is in place, penetrating the pull rods into earrings of a front bearing seat, screwing the pull rods into lugs of the lower cylinder after the lower cylinder is in place, and locking the pull rods by nuts;

The cylinder is leveled, the axial level of the cylinder is adjusted according to the rotor lifting requirement, a level gauge is placed between a bearing seat and a middle split surface of the cylinder, and the axial level of the cylinder is consistent with that of the bearing seat by adjusting a spherical washer thread seat or a lower cat claw jack screw below a flange of the middle split surface of the bearing seat;

further, the primary centering procedure of the bearing support and the cylinder comprises the bearing support and the cylinder; the bearing seat and the cylinder are initially centered by adopting a wire drawing method.

Further, the assembly process of the rotor comprises a steam turbine rotor, a bearing and a bearing seat; cleaning front and rear bearings and a thrust bearing, and mounting the lower half of the radial bearing into a bearing seat;

the rotor is hung into the cylinder by adopting a special tool hanging beam, a special centering tool is fixed on the rotor, centering detection can be carried out by clamping the gauge pins and the dial indicator on the fixed joint, and the bearing seat and bearing checking work and the centering and inserting of the rotor and the cylinder are carried out; radial bearing inspection; the radial bearings arranged in the front bearing seat and the rear bearing seat are two oil wedge bearings, the bearings consist of two halves, the upper half and the lower half are connected by bolts, and dislocation is prevented by taper pins;

checking the gap between the bush and the journal, and checking by adopting a lead pressing method;

The oil inlet pipe and all oil drain holes should be unblocked when the bearing is assembled, and the direction and the position of the lubricating oil inlet of the bearing seat should be noted so as to be correspondingly registered with the bearing; installing a thrust bearing in a front bearing seat, and cleaning and checking the thrust bearing; the supporting spring at the lower part of the thrust bearing, the tightening force of which is adjusted when the upper half bearing bush is taken down, is adjusted to ensure that the middle split surface of the lower half is strictly kept horizontal, and then the screw is firmly punched;

further, the upper and lower cylinder combining process comprises an upper cylinder and a lower cylinder;

when the cylinder is combined, the cylinder is hung in an upper cylinder, a guide post is arranged, and a layer of sealing paint with the thickness of 0.3-0.5 mm is uniformly smeared on the middle split surface of the cylinder; when the upper and lower cylinder split surfaces are about to be closed and the sling is not released, the cylinder positioning pin is arranged;

loosening the lifting rigging, and coiling the rotor;

tightening the split bolt, and then completing the conversion of the cylinder support;

removing a centering tool, removing color codes remained on a rotor and a bearing bush during color coating inspection, and mounting a bearing, an upper half of a bearing seat and an oil seal ring;

the manual jigger mechanism is assembled, and the manual jigger mechanism can be repeatedly used in the installation process to check the functions of the manual jigger mechanism; the hydraulic jigger mechanism checks the axial clearance between the frame and the ratchet wheel, and the rear clearance is larger than or equal to the rear steam seal clearance;

Installing a connecting piece of the steam turbine and the generator;

spot welding the sizing block, withdrawing the adjusting screw to the position where the spherical end part is flush with the bottom surface of the support, and removing the adjusting screw backing block;

disassembling a cylinder split locating pin, and spot welding a front bearing seat pull rod nut according to requirements;

after the position of the steam turbine support is determined, the secondary grouting of the foundation can be performed by adopting cement-based grouting materials without moving any more;

the secondary grouting of the steam turbine and the secondary grouting of the driven machine are performed simultaneously, and the secondary grouting is completed once.

And (3) after at least 24 hours of secondary grouting, the heavy object can be assembled and disassembled on the steam turbine.

After 72 hours of secondary grouting, the anchor bolts are screwed down according to the final pre-tightening moment, so that after long-term operation, the anchor bolts still have enough residual stress to ensure firm connection with a foundation.

Centering a coupler of the generator and a turbine rotor;

adjusting the magnetic center and the air gap of the generator;

the foundation sizing block is welded completely, and the condenser is connected with the air exhaust cylinder and welded completely;

further, the generator assembly process;

the jigger mechanism is assembled well, the jigger mechanism is arranged at the bottom of the jigger,

installing a connecting piece of the steam turbine and the generator;

the secondary grouting process of the steam turbine and the secondary grouting process of the driven machine are performed simultaneously, and are completed once;

centering a coupler of the generator and a turbine rotor; adjusting the magnetic force center and the air gap of the motor; the foundation sizing block is welded completely, and the condenser is connected with the air exhaust cylinder and welded completely; after the pipelines, cables, instrument pipelines and the like of the secondary grouting layer are laid, the pipelines, cables, instrument pipelines and the like are worn in special sleeves and are not allowed to be directly buried in concrete.

The beneficial effects of the invention are as follows:

compared with the prior art, the process technology is used for installing the steam turbine, the installation procedure is clear, the quality control point is concise, the construction progress is effectively ensured, the engineering quality is improved, and the construction cost is saved. The method has a high reference effect on the installation engineering of the same type of steam turbines.

Detailed Description

The present invention will be further elucidated with reference to the following embodiments, which should be understood as merely illustrative of the invention and not as limiting the scope of the invention.

The invention discloses a disassembly and installation process of a steam turbine of a chemical power station, which comprises the following steps:

step one: a basic treatment procedure of a turbine body installation matrix;

(1) supplementing a cement foundation;

(2) limiting the aperture difference;

step two: assembling and transporting the bearing seat and the rotor;

front and rear bearing supports are transported into position

The cylinder is transported to be in place;

the bearing support and the cylinder are first calibrated;

hoisting and transporting the rotor to be in place;

calibrating a rotor and a cylinder;

assembling and adjusting the ventilation part;

moving an upper cylinder and a lower cylinder to be matched with the upper cylinder and the lower cylinder to be combined;

detecting and repeatedly adjusting the centers of the rotor and the cylinder;

assembling and ending the steam turbine;

secondary grouting of the steam turbine;

(1) positioning a generator bedplate;

(2) positioning a generator and primarily correcting;

(3) the correction center of the backrest wheel of the steam turbine;

(5) secondary grouting of the generator;

step four: debugging and preliminary detection after equipment assembly;

(1) oil circulation flushing;

(2) and an external pipeline is connected.

Because the top surface of the supporting bottom plate is required to be horizontal, a layer of cement-based grouting material with the thickness of about 20mm is required to be laid on the foundation, then the supporting bottom plate is buried in the grouting material, the extruded mortar is required to be smeared upwards in an inclined mode, the mortar surfaces around the bottom plate are slightly lower than the top surface of the bottom plate, when the mortar is not solidified, the level of the top surface of the bottom plate is checked by a level meter in two directions of longitudinal and transverse directions, and the bottom plate is gently knocked, so that bubbles of the level meter are positioned in the middle position; the roughness of the upper surface of the bottom plate of the supporting bottom plate, and the flatness deviation is less than 0.1;

when the sizing blocks are installed, each stack of sizing blocks is generally not more than three, and in special cases, up to 5 sizing blocks are allowed, and each pair of diagonal sizing blocks is calculated according to 2 blocks; the contact surface of the oblique sizing block and the flat sizing block are inspected by a 0.05mm feeler gauge; and taking the longitudinal and transverse central lines of the steam turbine generator unit as a reference, and the deviation of the positions of the embedded sizing blocks to the center of the screw hole is not more than 3mm.

Step two, the front and rear bearing support positioning procedure comprises the steps of horizontally hoisting the support, and cleaning the bottom surface of the support; adding a lubricant on the threads of the adjusting screws at the bottom of the support, screwing the adjusting screws out of the bottom surface of the support by 20mm, and putting down the support to enable all the adjusting screws to be in contact with the base plate on the foundation;

removing the upper half of the bearing seat, removing the radial bearing and the thrust bearing, cleaning the bearing seat and performing appearance inspection, and cleaning the bearing seat without casting sand, cracks, rust and sundries; checking the gap between the horizontal joint surface of the bearing pedestal and the bearing cover, and checking that a 0.05mm clearance gauge is not plugged in by using the clearance gauge after the bolts are tightly screwed;

the front and rear bearing supports are in accordance with the position specified by the basic center line, and meanwhile, the axial distances between the front and rear support catfeet and the two sides of the screw are equal, and the distances between the two catfeet and the screw are equal, so that the axial center lines of the front and rear supports are basically aligned; penetrating an anchor bolt, and screwing a nut by hand;

the center heights of the front support and the rear support meet the required heights through the adjusting screws of the supports;

the foundation bolts are screwed according to the initial screwing moment in the table 3.1.4-1;

In the second step, the cylinder positioning process includes: hanging the lower half of the cylinder, placing a cylinder cat claw on a bearing support by means of a jacking screw, removing two pull rods at the front end of the cylinder before the lower cylinder is in place, penetrating the pull rods into earrings of a front bearing seat, screwing the pull rods into lugs of the lower cylinder after the lower cylinder is in place, and locking the pull rods by nuts;

the eccentric guide post between the rear part of the cylinder and the rear support is assembled and disassembled on site, and the original direction is kept as much as possible when the cylinder is reloaded;

the adjustment of the relative position of the cylinder and the support needs to be performed through the high adjustment and horizontal correction of the center of the cylinder, and the axial positioning when the lower cylinder is in place takes L as a reference, wherein L refers to a product qualification instruction provided by manufacturers; the adjustment of the L value is carried out by utilizing an eccentric guide post between the cylinder and the rear support, and the eccentric direction of the eccentric guide post is firstly determined during adjustment, because the adjustment action of the eccentric guide post is related to the eccentric direction when the eccentric pin and the eccentric sleeve are assembled, if the eccentric direction is in the axial direction, the transverse center of the cylinder is mainly adjusted when the sleeve is rotated, and when the eccentric direction is in the transverse direction, the eccentric guide post is mainly used for adjusting the axial position of the cylinder;

the method comprises the steps of adjusting the center height of a cylinder, namely, adjusting a lower cat claw jacking screw of the cylinder to enable the center height of a middle split surface of the cylinder to be consistent with the center height of a middle split surface of a bearing seat, wherein in the adjusting process, the requirement of the distance from the middle split surface of the cylinder to the top surface of a support needs to be considered, at the moment, after the distance is adjusted according to the numerical value on a qualification certificate, an upper cylinder is hoisted in, the cat claw of the upper cylinder is supported on a spherical gasket, through adjusting a threaded support below the spherical gasket, under the condition that the threaded support bears load and is locked by a locking screw, the distance is kept unchanged, then, adjusting the lower cat claw jacking screw to enable the middle split surfaces of the upper cylinder to be contacted, at the moment, the contact condition of the middle split surface of the cylinder can only be checked from front, rear, left and right partial ranges, the adjusting quantity of the lower cat claw jacking screw can also be monitored through additionally installing a dial indicator, after the position of the lower cylinder is adjusted, the jacking screw needs to be locked, and the position of the lower cylinder needs to be kept unchanged, and then the upper cylinder is hoisted;

The cylinder is leveled, the axial level of the cylinder is adjusted according to the rotor lifting requirement, a level gauge is placed between a bearing seat and a middle split surface of the cylinder, the axial level of the cylinder and the bearing seat is consistent by adjusting a spherical washer thread seat or a lower cat claw jack screw below a flange of the middle split surface of the bearing seat, the horizontal level of the cylinder is detected by a leveling rod and the level gauge, and the deviation is less than 0.06mm/m;

after the cylinder is in place, the relative positions of the cylinder and the front and rear bearing seats are additionally checked to confirm that the center distance of the front and rear bearings meets the requirements, and the positions of the bearing seats are adjusted if necessary; the axial position of the front bearing seat is adjusted through a pull rod nut, and the rear bearing seat is adjusted by utilizing two eccentric guide posts of the rear bearing seat; the adjustment of the position of the general bearing seat is mainly used for meeting the requirements of rotor and cylinder centering and rotor axial positioning.

The primary centering procedure of the bearing support and the cylinder comprises the bearing support and the cylinder; the bearing seat and the cylinder are initially centered by adopting a wire drawing method, when the wire drawing method is adopted for centering, steel plate rulers are used for measuring the front and rear bearing dimples and the vapor seal dimples, and the axial center lines of the front and rear bearing seats and the axial center lines of the front and rear vapor seal dimples are basically positioned in the same vertical plane through adjustment, so that the center deviation is less than 0.5mm;

The assembling process of the rotor comprises a steam turbine rotor, a bearing and a bearing seat; cleaning front and rear bearings and a thrust bearing, and mounting the lower half of the radial bearing into a bearing seat;

lifting the rotor into the cylinder by adopting a special tool lifting beam, and cleaning the shaft neck of the rotor firstly;

the special personnel command is needed in the rotor hoisting process, the axis is required to be kept horizontal when the rotor is hoisted, and when the rotor is in place, the rotor is required to be supported by skilled installation personnel at two ends, so that the friction of dynamic and static parts is required to be avoided; when the shaft neck of the rotor is 150mm away from the bearing bush, pouring clean turbine oil on the bearing bush, supporting the rotor by a radial bearing, loading the rotor into a thrust bearing, and coiling the rotor to check whether jamming and friction exist; the rotor and the cylinder are centered, namely, the rotor is used for centering the vapor seal hollow nest, so that the axis of the rotor is as consistent as possible with the center line of the cylinder;

the end faces of the front and rear gland pockets of the cylinder are respectively provided with a ring groove, the ring grooves are called as cylinder measuring rings, and when the cylinder is assembled in a steam turbine plant, after the rotor and the gland pockets are well centered, the measuring rings are also used for measuring and recording; r4 and R4 in the qualified certificate of the steam turbine product are the finding values of the front and back steam seal dimples, and R3 and R3 are the measurement results of the front and back measuring rings;

The special tool for centering is fixed on the rotor, and the gauge pins and the dial indicator are clamped on the fixed joint to perform centering detection, wherein each measuring position has 6 measuring points; r3, R3, R4 and R4 in the qualified certificate of the steam turbine product are measured values after the upper cylinder and the lower cylinder are combined, in the field installation process, when the rotor and the cylinder are centered, the cylinder is only at the lower half, so that each measured position only has 3 measuring points, at this time, the measurement is carried out at three measuring points of the vapor seal hollow nest in front and behind the cylinder, if the deviation between the rotor and the cylinder center is less than 0.05mm, and the rotor center is lower than the cylinder center, the subsequent work can be carried out, if the rotor and the cylinder center are out of tolerance, the field condition needs to be adjusted, the cylinder or the bearing seat needs to be adjusted, the cylinder is lifted into the upper cylinder after the center meets the requirement, at this time, the cylinder is still supported by the lower cat claw jacking screw, a locating pin is matched, the cylinder split bolt is screwed at intervals, then the cylinder supporting conversion is carried out, and under the condition that the upper cat claw is padded by a spherical gasket, the lower cat claw jacking screw is loosened; when the cylinder support is switched, a dial indicator is used for monitoring the position of a gland seal depression, if the center of the cylinder moves downwards after the switching, the reading of the dial indicator is restored to the original indicating value by adjusting a threaded support and the threaded support is locked, then measurement is carried out at the position of the gland seal depression before and after the cylinder, the rotor and the cylinder center meet the requirement, measurement is carried out at a cylinder measuring ring and recording is carried out, the measuring ring is used as a reference of a later rechecking center, the upper cylinder is hung, the jack screw is required to jack the lower cat claw before the split bolt is loosened, and the screwing moment is changed to the degree from the reading of the dial indicator;

Bearing seat and bearing checking work and rotor and cylinder centering and inserting; radial bearing inspection; the radial bearings arranged in the front bearing seat and the rear bearing seat are two oil wedge bearings, the bearings are formed by two halves, the upper half and the lower half are connected by bolts and are prevented from dislocation by taper pins, and positioning pins are specially arranged for preventing the bearing body from moving in the axial direction and the circumferential direction; the inner side of the bearing body is a tin-based bearing alloy layer, and the thickness of the tin-based bearing alloy layer is 2mm at the maximum; the size of the oil wedge is ensured by processing, and manual scraping is not required; carefully checking whether the bearing alloy contact surface has defects such as cracks, sand holes and the like, checking whether a tile tire is unshelling, marking all parts of the bearing, and preventing reverse installation;

the upper tile and the lower tile are matched without the phenomenon of staggering, and the middle parting surface is blocked by a 0.05mm feeler gauge under the condition of not tightening bolts; the spherical surface of the bearing bush and the spherical surface seat must be in good contact, the area reaches more than 75%, and the bearing bush and the spherical surface seat are uniformly distributed; the bearing pad block and the hollow nest of the bearing pad block are in tight contact, the contact surface is larger than 70%, the local clearance is 0.05mm, the depth of the feeler gauge is less than or equal to 10mm, the adjusting pad in the pad block adopts stainless steel sheets, and more than three pieces of the adjusting pad block are not allowed;

the oil inlet pipe and all oil drain holes should be unblocked when the bearing is assembled, and the direction and the position of the lubricating oil inlet of the bearing seat should be noted so as to be correspondingly registered with the bearing;

The thrust bearings are arranged in the front bearing seat, the bearings belong to Kingsbril thrust bearings, and each thrust bearing comprises a positive group of thrust bearings and a negative group of thrust bearings; each group of bearings consists of a base ring, a thrust pad, an upper adjusting block, a lower adjusting block and the like; the base ring is horizontally split, the upper half and the lower half are connected by bolts and positioned by taper pins, and the base ring and the bearing seat are circumferentially positioned by anti-rotation pins; each group of 8 thrust pads are uniformly distributed along the circumferential direction, tin-based Babbitt alloy is cast on the working surface of each pad, a supporting block is embedded on the back surface of each pad, the pad positions are radially positioned by the inner ring of the base ring, the circumferential direction is positioned by pad screws, and the relationship among the thrust pads, the adjusting blocks and the base ring is spherical contact, so that the thrust pads have multi-directional degrees of freedom, and meanwhile, each pad can uniformly bear load due to the structure; the upper part and the lower part are circumferentially positioned by cylindrical pins;

when the thrust bearing is arranged at the position in the bearing seat, the thickness of the adjusting gasket is configured to ensure that the axial gap between the rotor thrust disc gear opening and the thrust bearing meets the requirement by configuring the thickness of a spacer ring between two base rings, and the spacer ring and the base rings are positioned circumferentially by bolts; the thrust pad adopts an eccentric supporting structure, and the supporting position of the thrust pad is offset relative to the center in the circumferential direction, so that the appointed steering bearing capacity is improved, but the bearing capacity is obviously reduced during reverse rotation, and as a result, the assembly needs to be careful, and the two groups of thrust pads of the positive and the negative can not be misplaced in tens of millions;

The thrust bearing should be cleaned and checked, the thrust pads should be numbered one by one, the thickness difference should be not more than 0.02mm, and well recorded, the thrust disc should be pressed against the pads when the final assembly is needed, and then correction is carried out according to the impression condition; the contact area of each thrust pad should reach more than 75% and be uniformly distributed, and after adjustment, the thickness of each thrust pad is measured and recorded;

the supporting spring at the lower part of the thrust bearing, the tightening force of which is adjusted when the upper half bearing bush is taken down, is adjusted to ensure that the middle split surface of the lower half is strictly kept horizontal, and then the screw is firmly punched;

when the axial clearance of the thrust bearing is measured, an upper half thrust bearing, a lower half thrust bearing, a positioning ring and an upper half bearing sleeve are required to be assembled, a turbine rotor is driven in a reciprocating mode, a rotor displacement value and a thrust bearing displacement value are measured, the difference between the two displacement values is taken as the clearance value of the thrust bearing, the thrust bearing is monitored by a dial indicator, no obvious axial displacement exists, and otherwise, the repeated measurement is required to be fixed.

The cylinder combining process of the upper cylinder and the lower cylinder comprises an upper cylinder and a lower cylinder;

when the cylinder is combined, the cylinder is hung in an upper cylinder, a guide post is arranged, and a layer of sealing paint with the thickness of 0.3-0.5 mm is uniformly smeared on the middle split surface of the cylinder;

lifting the upper cylinder according to a specified lifting position, wherein the horizontal plane of the upper cylinder is kept horizontal when the upper cylinder is lifted, the upper cylinder is checked at any time when falling, uneven falling and blocking cannot occur, and when the middle planes of the upper cylinder and the lower cylinder are about to be closed and the sling is not released, the upper cylinder and the lower cylinder are installed into a cylinder positioning pin;

Loosening the lifting rigging, coiling the rotor, and noticing that no friction sound should be arranged in the listening cylinder;

tightening the split bolt, wherein in the installation process of the steam turbine, when the split bolt is tightened after the upper cylinder and the lower cylinder are combined, the tightening torque is required according to technical files provided by manufacturers in order to avoid the deformation of the split flange and prevent the split from leaking steam;

the cylinder support is switched, the overall structure of the steam turbine determines that the cylinder support is in an upper cat claw support form, when the steam turbine is installed, the cylinder is temporarily supported by a lower cat claw before and during the cylinder closing process, after a split bolt in the cylinder is screwed down as required, the cylinder is switched to be supported by the upper cat claw, when the cylinder support is switched, a spherical gasket is tightly attached to the upper cat claw, after a threaded support is locked by a locking screw according to a specified moment, a clearance gauge is used for checking the contact surface between the spherical gasket and the upper cat claw, a 0.03mm clearance gauge piece is not inserted, then a lower cat claw jack screw is loosened, and after the lower cat claw jack screw is withdrawn for 3-5 mm, the locking is performed;

after the cylinder support is switched, the rotor and the cylinder center can be changed, and after the threaded support is loaded, the screw gap causes the cylinder center to move downwards; the axial level of the front bearing seat is changed from front low to rear high, and the rear bearing seat is from front high to rear low; after the cylinder support is converted, the rotor and the cylinder center are required to be re-calibrated, and if the center deviation is > +/-0.03 mm, the rotor and the cylinder center are required to be re-adjusted;

(1) Removing a centering tool, removing color codes remained on a rotor and a bearing bush during color coating inspection, and mounting a bearing, an upper half of a bearing seat and an oil seal ring;

(2) The manual jigger mechanism is assembled, and the manual jigger mechanism can be repeatedly used in the installation process to check the functions of the manual jigger mechanism; the hydraulic jigger mechanism checks the axial clearance between the frame and the ratchet wheel, and the rear clearance is larger than or equal to the rear steam seal clearance;

(3) Installing a connecting piece of the steam turbine and the generator;

(4) Spot welding the sizing block, withdrawing the adjusting screw to the position where the spherical end part is flush with the bottom surface of the support, and removing the adjusting screw backing block;

(5) Disassembling a cylinder split locating pin, and spot welding a front bearing seat pull rod nut according to requirements;

Centering a coupler of the generator and a turbine rotor;

adjusting the magnetic center and the air gap of the generator;

the pipelines, cables, instrument pipelines and the like which pass through the secondary grouting layer are laid completely and are required to be worn in special sleeves, and are not allowed to be directly buried in concrete.

The unit equipment, in particular to the insulation board of the rear bearing seat of the generator, the sliding surface of the bedplate, the electrical equipment at the lower part of the generator and the like, should be properly protected to prevent the pollution and the wetting during secondary irrigation;

the rough surface of the foundation concrete contacted with the secondary pouring layer must be purged completely, and has no sundries, paint and greasy dirt. The surface of the concrete is soaked for more than 24 hours;

the surface of the bedplate contacted with the secondary irrigation layer is cleaned up, and paint and oil stains are avoided;

the inside of the anchor screw hole is cleaned up, and no sundries exist; the foundation bolt backing plate and the foundation concrete are in good contact, so that slurry leakage can be avoided when the concrete is poured;

the secondary pouring part must not obstruct the thermal expansion of the steam turbine and the pipeline, and must not block the oil filling hole or the drain hole of the bedplate;

the nuts of the foundation bolts exposed out are added with sleeves as much as possible, and gaps enough for sleeving the wrenches are reserved around the nuts;

The foundation secondary irrigation is uniformly directed and is responsible for comprehensive inspection and coordination matters related to civil engineering and installation, and steam turbine installation constructors should coordinate and inspect;

the cement used for the secondary pouring concrete is preferably grouting material;

the interior of the bedplate is filled up and filled up by hands around, so that the irrigation height is ensured;

the secondary irrigation work under each bedplate should be continuously carried out and should not be interrupted;

the turbine and the generator can be preferably cast for one time when the foundation is cast for the second time;

when in pouring, a concrete test block is made according to the specification, the concrete test block and a secondary pouring layer are maintained under the same condition, and a strength test is made according to the required time, so that a report is provided;

after the irrigation is finished, the mortar splashed on the surfaces of the equipment and the bolts should be immediately wiped clean and maintained according to the requirements, and the equipment is not affected with damp during the irrigation;

before the concrete strength of the foundation secondary pouring layer is less than 70% of the design strength, the heavy parts are not allowed to be disassembled and assembled on the unit, the impacting work is not allowed to be performed, and before the concrete strength of the foundation secondary pouring layer is less than 80% of the design strength, the foundation bolts are not allowed to be re-tightened and the unit is started;

the construction process of secondary pouring concrete of the foundation should be strictly controlled, and after the curing expires and the form is removed, the appearance and the quality should meet the design requirements and are commonly witnessed by related personnel.

The generator assembly process;

(1) And (3) removing the centering tool, removing color codes remained on the rotor and the bearing bush during color coating inspection, and mounting the bearing, the upper half of the bearing seat and the oil seal ring.

(3) Installing a connecting piece of the steam turbine and the generator;

the secondary grouting of the steam turbine and the secondary grouting of the driven machine are performed simultaneously, and the secondary grouting is completed once;

after the secondary grouting is carried out for at least 24 hours, the heavy object can be assembled and disassembled on the steam turbine;

after secondary grouting for 72 hours, the foundation bolts are screwed down according to the final pretightening moment, so that after long-term operation, the foundation bolts still have enough residual stress to ensure firm connection with a foundation;

Debugging the equipment after assembly; the unit equipment, in particular to the insulation board of the rear bearing seat of the generator, the sliding surface of the bedplate, the electrical equipment at the lower part of the generator and the like, should be properly protected to prevent the pollution and the wetting during secondary irrigation;

the surface of the plate contacted with the secondary irrigation layer is cleaned up, and paint and oil stains are avoided;

the secondary pouring position must not obstruct the thermal expansion of the turbine and the pipeline, and must not block the oil filling hole or the drain hole of the bedplate;

the foundation secondary concrete pouring and maintenance work of the steam turbine generator unit should be carried out according to the relevant technical specifications of electric construction and acceptance inspection, and the following requirements should be met:

The construction process of secondary pouring concrete of the foundation is strictly controlled, and after the maintenance expires and the form is removed, the appearance and the quality meet the design requirements and are witnessed by related personnel together;

the welding of the steam inlet and outlet pipe is to ensure the levelness of the flange of the connecting port and the cleanliness in the pipe, the pipe section is subjected to pickling treatment, and after being connected with a cylinder, the cylinder level, the rotor lift and the platen gap are checked and recorded, and if the deviation is too large, the adjustment is needed;

the drain hole, the instrument socket, the connector and the plugging plate at the cylinder body are correctly installed, complete and free from omission;

the fixed heat-insulating layer framework is firmly laid, the diameter of a heat-insulating hook drilling hole is not more than 8mm, the depth is not more than 10mm, and the distance between the heat-insulating hooks is about 300 mm;

the flatness of the cosmetic board is not uneven, the pressing strips of the cosmetic board are straight, no overlapping and opening are caused, and the screws are complete and firm;

checking whether the concrete surface is smooth or not, and whether cracks, holes, honeycombs, pitted surfaces, exposed ribs and the like exist;

checking whether the reserved holes of the foundation are consistent with the design, and measuring the elevation of the foundation, the center line distance and the verticality of the bolt hole;

marking out the position of a basic sizing block and the central line and elevation of the air cooler according to the sizing block layout diagram and the air cooler layout diagram;

The concrete of the foundation bearing surface is chiseled, the contact condition of the flat plate paint inspection is equal to or more than 65 percent, the flat plate bearing surface is closely contacted and has no tilting;

the contact between the sizing block and each joint surface of the bedplate is uniformly distributed by more than 65%, and the inspection is performed by a 0.05mm feeler gauge; the staggered part of the oblique pad iron should not exceed 25% of the area of the pad iron;

each group of sizing blocks generally does not allow more than three blocks and does not allow single-side stress;

and determining the thickness of the flat pad iron according to the thickness of the platen, the size of the oblique pad iron and the basic elevation, and manufacturing and processing. The flatness of the flat pad iron after grinding is within 0.02mm, and the surface roughness is V5;

the bedplate is smooth and flat and has no burrs; the elevation of the top surface after being positioned is adapted to the steam-generating center, and the error is not more than +/-5 mm;

the upper cushion block of the foundation bolt is flat and is closely contacted with concrete, so that uneven force is prevented; when the bolt is installed, the bolt is in a vertical state, the allowable deviation is L/200 (L is the length of the foundation bolt), and the allowable deviation is less than or equal to 5mm;

the generator is hauled to the hoisting hole in advance, and is put in place, and then is practically padded and stably adjusted;

the steel wire rope is bound on a special lifting lug appointed by a generator manufacturer, and other parts on the generator shell cannot be arbitrarily selected to be bound with the steel wire rope to lift the stator;

The generator should be kept horizontal while being lifted and the driving and building structures should be monitored. After the generator leaves the ground, the hook can be lifted after the brake of the travelling crane is tested for 1-2 times. The hooking speed is slowly and evenly balanced. After the lowest point of the generator exceeds the platform, stopping ascending, moving the cart, and placing the generator on the bedplate;

primarily aligning the generator by using a level meter;

the relative positions of the two flanges of the coupler are aligned according to marks of a manufacturer, if no marks exist, the offset values of the two flanges are complementary, and the bolts are aligned with each other, so that the reaming processing amount is reduced, and marks are made to serve as the basis for centering and final alignment connection of the coupler;

each measurement should be performed after the two couplers rotate 900 or 1800 respectively along the same direction, and when the rotor is driven each time, the measuring point positions of the two half couplers should be aligned and unchanged, and the driving angles should be consistent; the measurement of the end face deflection is carried out at two corresponding points with equal radius of 180 degrees each time so as to eliminate the error caused by rotor movement;

the oil shield, the steam seal and the rotor have enough gaps to ensure that the rotor is put in the gap and is not pressed on the oil shield;

when the measurement is carried out, rigid connection is not allowed between the two rotors, and the two rotors are in a free state respectively;

The centering tool of the coupler has enough rigidity, and the installation is required to be firm and reliable; when the dial indicator is used for centering the coupler, the dial indicator frame is firmly arranged, so that collision is avoided, and the measurement accuracy is ensured; after the coupler is rotated for one circle to return to the original position, the dial indicator in the circumferential direction can be read to return to the original value;

when the end face gap is measured, the number of the feelers plugged into the gap is not more than four;

when the coupler is centered, the oil retaining pit and the lift of the shaft neck of the rotor of the steam turbine are kept within the specified range, the bedplate is free from gaps, and the sizing block and the bedplate and the sizing block are checked by using a 0.05mm feeler gauge;

when the coupler center and the rotor lift degree are contradictory, the coupler center should be used as the reference;

the secondary irrigation of the generator is completed once;

oil circulation flushing procedure:

firstly, flushing an oil pipeline between a main oil tank and an overhaul oil tank until the oil pipeline is clean;

flushing the main pipeline of the main oil pump inlet and outlet independently until cleaning;

a temporary pipe is additionally arranged at the oil bearing inlet to short-circuit the bearing bush, so that oil does not enter the contact surface of the tungsten alloy and the shaft neck;

the high-pressure oil pump and the low-pressure oil pump can alternately operate for flushing during flushing. The temperature of the flushing oil is preferably alternated, the high temperature is about 75 ℃, but the temperature is not more than 80 ℃, the low temperature is below 30 ℃, the high temperature and the low temperature are respectively kept for 1-2 hours, and the alternating temperature changing time is about 1 hour; the oil temperature heating can be electric heating or temporary heating steam pipes; the oil cooling can be performed by using cooling water of an oil cooler; in the oil circulation process, the oil tank and the filter screen of the oil filter should be checked and cleaned regularly; after the self-inspection is qualified, the circulating oil is taken to an inspection mechanism for inspection, and the circulating oil can be put into use after the self-inspection is qualified.

The technical means disclosed by the scheme of the invention is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme consisting of any combination of the technical features; it should be noted that the foregoing merely illustrates the technical idea of the present invention and is not intended to limit the scope of the present invention, and that a person skilled in the art may make several improvements and modifications without departing from the principles of the present invention, which fall within the scope of the claims of the present invention.

Claims

1. A chemical power station steam turbine disassembly and installation process is characterized in that; the method comprises the following steps:

step one: a basic treatment procedure of a turbine body installation matrix;

(1) Supplementing a cement foundation;

(2) Limiting the aperture difference;

step two: assembling and transporting the bearing seat and the rotor;

(1) Front and rear bearing supports are transported into position

(2) The cylinder is transported to be in place;

(3) The bearing support and the cylinder are first calibrated;

(4) Hoisting and transporting the rotor to be in place;

(5) Calibrating a rotor and a cylinder;

(6) Assembling and adjusting the ventilation part;

(7) Moving an upper cylinder and a lower cylinder to be matched with the upper cylinder and the lower cylinder to be combined;

(9) The cylinder and the front and rear bearing seats are transported to be in place;

(10) The cylinder body, the rotor and the inner cylinder are cleaned;

(11) And (3) mounting an inner lower cylinder: hoisting the inner lower cylinder by using a crane, and leveling and aligning;

(12) Rotor hoisting in place and clearance measurement: hoisting a rotor by using a crane, measuring a jumping value of a position where the rotor is located, and detecting the jumping, the deflection and the initial finding of the coupling; measuring bearing clearance, oil seal clearance, measuring ring and other data, and then sticking adhesive cloth for retesting;

(13) Thrust tile hoisting and rotor runout value measurement: hoisting a thrust tile by using a crane, and leveling and aligning;

(14) Gap measurement: measuring, adjusting and recording concentricity of the rotor and the lower cylinder; measuring, adjusting and recording the rotor, the air seal and the through-flow gap; measuring, adjusting and recording the gap between the inner cylinder and the upper cylinder;

(15) And (3) air seal installation: hoisting the air seal by using a crane and aligning;

(16) And (3) mounting internal parts: after the cylinder is cleaned, installing through-flow parts, and spot welding split bolts such as an inner cylinder, a holding ring and the like;

(17) Buckling a jar: after the installation and inspection are completed, the data are normal, the hoisting cylinder is carried out, the stud nuts, the electric heating studs, the retest measuring ring and other data are installed, and adjustment is carried out if necessary;

(18) And (3) heat tightening: the outer cylinder bolts are restrained and thermally fastened, the lower cylinder slide way is fastened, the cat claw bolts are fixed, and the front bearing box and the rear bearing box are reset and the gap is adjusted;

(19) And (3) oil pipe installation: the lubricating oil pipeline of the machine body is installed, bolts are fastened, the tightness is checked, and oil leakage is avoided;

(20) Quick closing valve installation: hoisting the quick-closing valve and the lower U-shaped pipe, and simultaneously, carrying out the reinstallation and debugging of the electric instrument element;

(21) Centering of the coupler: centering and aligning the generator and the steam turbine, resetting an oil pipe at the position, resetting a rear bearing box after the oil pipe is qualified, and checking whether lubricating oil is qualified;

(22) And (3) pipeline connection: setting up an operation scaffold before connection, installing steam inlet and outlet pipelines, and simultaneously, checking a meter on a coupler to monitor the change of a median value; joint inspection and acceptance are needed after installation, and the scaffold is dismantled after the inspection and acceptance are finished;

(23) Assembling and ending the steam turbine; secondary grouting of the steam turbine;

(1) Positioning a generator bedplate;

(2) Positioning a generator and primarily correcting;

(3) The correction center of the backrest wheel of the steam turbine;

(5) Secondary grouting of the generator;

step four: debugging and preliminary detection after equipment assembly;

(1) Oil circulation flushing;

(2) Electric test and debugging work;

(3) Gas turbine flushing and grid connection: before the turbine is turned, firstly, carrying out heat preservation on the temporary turbine, and turning after the joint inspection test reaches the turning requirement, and carrying out gas turbine turning after the turbine meets the turning condition; heat preservation of the steam turbine: and removing the temporary heat preservation layer after the successful flushing and transferring, and carrying out formal heat preservation strictly according to the heat preservation instruction of the steam turbine.

2. The process for disassembly and assembly of a steam turbine of a chemical power station according to claim 1, wherein the process comprises the following steps: in the first step, the elevation deviation of the basic surface is less than or equal to 10mm, the longitudinal and transverse central lines of the basic are mutually perpendicular, and the deviation between the longitudinal and transverse central lines of the basic and the datum line is less than or equal to 1mm/m; the center deviation of the bolt hole is less than or equal to 5mm, and the plumb error of the wall of the bolt hole is less than or equal to 1/1000 and less than or equal to 5mm; the embedded supporting bottom plate is supplemented, so that the foundation bolt holes are cleaned up, sundries are avoided, the embedded supporting bottom plate is slightly compressed by using nuts, mortar starts to be extruded, long-term operation of a unit is facilitated, slurry leakage during backfilling of the foundation bolt holes can be prevented, the foundation bolt holes can be backfilled after 12 hours, and the strength of the backfilled mortar after 72 hours is more than 60N/mm; after secondary grouting, the asphalt adhesive tape is wound on the foundation bolt, the winding range is wound upwards from the position of the lower end nut to the upper screw tail, if the adhesive tape is thinner, multiple layers of adhesive tapes can be wound, and the winding direction is the same as the screwing direction of the nut, so that when the nut is screwed, the adhesive tape is pushed upwards to form a spherical hoop.

3. The process for disassembly and assembly of a steam turbine of a chemical power station according to claim 2, wherein: the surface roughness deviation of the bottom plate of the supporting bottom plate is less than 0.1, and the flatness deviation is less than 0.1;

4. The process for disassembly and assembly of a steam turbine of a chemical power station according to claim 1, wherein the process comprises the following steps: step two, the front and rear bearing support positioning procedure comprises the steps of horizontally hoisting the support, and cleaning the bottom surface of the support; the bearing support is put down, so that all the adjusting screws are contacted with the base plate on the foundation;

correcting the level of the support, and correcting the axial and transverse levels of the support by using an adjusting screw on the premise of keeping the central height unchanged, wherein the deviation is less than 0.06mm/m.

5. The process for disassembly and assembly of a steam turbine of a chemical power station according to claim 1, wherein the process comprises the following steps: in the second step, the cylinder positioning process includes: hanging the lower half of the cylinder, placing a cylinder cat claw on a bearing support by means of a jacking screw, removing two pull rods at the front end of the cylinder before the lower cylinder is in place, penetrating the pull rods into earrings of a front bearing seat, screwing the pull rods into lugs of the lower cylinder after the lower cylinder is in place, and locking the pull rods by nuts;

the cylinder is leveled, the axial level of the cylinder is adjusted according to the rotor lifting requirement, a level gauge is placed between a bearing seat and a middle split surface of the cylinder, and the axial level of the cylinder is consistent with that of the bearing seat by adjusting a spherical washer thread seat or a lower cat claw jacking screw below a flange of the middle split surface of the bearing seat.

6. The process for disassembly and assembly of a steam turbine of a chemical power station according to claim 1, wherein the process comprises the following steps: the primary centering procedure of the bearing support and the cylinder comprises the bearing support and the cylinder; the bearing seat and the cylinder are initially centered by adopting a wire drawing method.

7. The process for disassembly and assembly of a steam turbine of a chemical power station according to claim 1, wherein the process comprises the following steps: the assembling process of the rotor comprises a steam turbine rotor, a bearing and a bearing seat; cleaning front and rear bearings and a thrust bearing, and mounting the lower half of the radial bearing into a bearing seat;

during bearing assembly, the oil inlet pipe and all oil discharge holes should be smooth, and attention should be paid to the lubricating oil inlet of the bearing seat

The direction and the position are correspondingly registered with the bearing; installing a thrust bearing in a front bearing seat, and cleaning and checking the thrust bearing; and the supporting spring at the lower part of the thrust bearing is used for adjusting the tightening force when the upper half bearing bush is taken down, and the tightening force is adjusted to ensure that the middle split surface of the lower half is strictly kept horizontal, and then the screw is firmly punched.

8. The process for disassembly and assembly of a steam turbine of a chemical power station according to claim 1, wherein the process comprises the following steps: the cylinder combining process of the upper cylinder and the lower cylinder comprises an upper cylinder and a lower cylinder;

when the cylinder is combined, the cylinder is hung in an upper cylinder, a guide post is arranged, a layer of sealing paint with the thickness of 0.3-0.5 mm is uniformly smeared on the middle part surface of the cylinder, and the paint has the temperature resistance and the bearing temperature of more than 550 ℃; when the upper and lower cylinder split surfaces are about to be closed and the sling is not released, the cylinder positioning pin is arranged;

Loosening the lifting rigging, and coiling the rotor;

installing a connecting piece of the steam turbine and the generator;

Centering a coupler of the generator and a turbine rotor;

adjusting the magnetic center and the air gap of the generator;

and (3) finishing the spot welding of the basic sizing block, and connecting and finishing the welding of the condenser and the air exhaust cylinder.

9. The process for disassembly and assembly of a steam turbine of a chemical power station according to claim 1, wherein the process comprises the following steps: the generator assembly process;

installing a connecting piece of the steam turbine and the generator;