CN105317471A - Turbine steam seal clearance adjustment method - Google Patents
Turbine steam seal clearance adjustment method Download PDFInfo
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- CN105317471A CN105317471A CN201510838161.2A CN201510838161A CN105317471A CN 105317471 A CN105317471 A CN 105317471A CN 201510838161 A CN201510838161 A CN 201510838161A CN 105317471 A CN105317471 A CN 105317471A
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Abstract
The invention relates to a turbine steam seal clearance adjustment method. The turbine steam seal clearance adjustment method which is simple in process, convenient to operate and capable of digitally, accurately and truly quantifying the steam seal clearance adjustment quantity is not available at present. The turbine steam seal clearance adjustment method is characterized in that by the adoption of the mode that lead wires are pressed in a circumferential uniform division manner, a clearance, at a horizontal junction surface position, of a lower half cylinder sleeve is measured through a feeler gauge; as for steam seal clearances of other portions, the lead wires of corresponding specifications are pasted to steam seal teeth, ends are fixed, a rotor is hoisted to a working position, the lead wires pasted to the steam seal teeth are each rolled to form a groove mark, and the rotor is hoisted out; the thickness of the remaining portion of the groove mark of each lead wire is measured through a steam seal clearance measuring scale, the thicknesses are actual values of the steam seal clearances, the actual values are compared with design values, and adjustment values of the steam seal clearances are worked out; and then the turbine steam seal clearances are adjusted according to the adjustment values. The turbine steam seal clearance adjustment method is simple in process, convenient to operate and capable of accurately and digitally quantifying the steam seal clearance adjustment quantity.
Description
Technical field
The present invention relates to a kind of Gland Clearance in Steam Turbine adjusting method, be applicable to firepower, combustion gas, the installation of all types of steam turbine set of nuclear power and maintenance, be mainly used in intense adjustment turbine steam seal radial clearance.
Background technique
The adjustment of labyrinth clearance is that steam turbine is installed and an extremely important and elaboration in maintenance process, most important to the safety of unit, economical operation.Labyrinth clearance is too little, and rotor easily grinds and touches.Labyrinth clearance is too large, and Steam loss increases, and reduces the internal efficiency of steam turbine, and meanwhile, high, intermediate pressure cylinder steam can spill from axle head affects lubricating oil quality, low pressure (LP) cylinder axle head leaking-in air reduces unit vacuum.
Current measurement labyrinth clearance generally adopts the method for rubberized fabric, judges labyrinth clearance according to the impression of red lead on adhesive plaster, and one deck medical proof fabric thickness is 0.25mm, and completely by rule of thumb, personal error is large, and adjustment relatively blindly.Comprise human factor (to tune up gap and ensure safety, adjustment operation wrong), apparatus factor (spring sheet poor flexibility, adjustment block loosens, packing the back of the body arc jagged), technological factor (cannot measure by excessive too small gap, estimate by rule of thumb, cannot quantitatively) unsuccessful at the interior gap regudation of steam sealing that causes.
Also there are now some Gland Clearance in Steam Turbine adjusting method relatively preferably, if publication date is on October 12nd, 2011, publication number is in the Chinese patent of CN102213110A, disclose a kind of steam turbine set steam sealing radial clearance and measure method for finishing, the method uses labyrinth clearance measuring scale to carry out quantitative measurment to the labyrinth clearance of whole circle, read its actual gap width and carry out there is object, repair targetedly and scrape, labyrinth clearance measuring scale comprises measuring rod and is positioned at the dial gauge of measuring rod upper end portion and is positioned at the measuring head of measuring rod underpart, in described measuring rod, through hole is set, through hole top arranges silk braid, in silk braid, surveyingpin is set, surveyingpin top is connected with dial gauge, outer casing spring in the middle part of surveyingpin, spring top is fixedly connected with silk braid, spring end connects tight power sleeve pipe, tight power sleeve pipe is fixed on surveyingpin, the technique of the method is comparatively complicated.
In sum, also do not have a kind of technique simple at present, easy to operate, labyrinth clearance regulated quantity is carried out digital quantization, accurately and more real Gland Clearance in Steam Turbine adjusting method.
Summary of the invention
The object of the invention is to overcome above shortcomings in prior art, and provide a kind of technique simple, easy to operate, labyrinth clearance regulated quantity is carried out digital quantization, accurately and more real Gland Clearance in Steam Turbine adjusting method.
The present invention's adopted technological scheme that solves the problem is: the feature of this Gland Clearance in Steam Turbine adjusting method is: described method adopts the mode of circumference equal dividing compacting galvanized wire, the gap that cylinder Lower Half is enclosed within horizontal integration face place is measured by clearance gauge, the labyrinth clearance at other positions is placed on gland sealing gear by sticky for the galvanized wire of dimension, end winding support, hang rotor in working position, the sticky galvanized wire be placed on gland sealing gear is just forced out one groove mark, hang out rotor, the thickness of galvanized wire groove mark remainder is measured by labyrinth clearance measuring scale, this thickness is exactly the actual value of labyrinth clearance, actual value and design load are contrasted, draw the value that labyrinth clearance will adjust, then again Gland Clearance in Steam Turbine is adjusted according to this value.
As preferably, the present invention measures in labyrinth clearance and before adjustment, tentatively need look for middle adjustment axle system, cleaning gland blocks and spring sheet, measures and adjustment dividing plate and shaft end gland seal Tao Wawo center.
As preferably, the present invention is fixing dead with correcting wedge in advance in gland blocks back of the body arc side, and when having an active force between gland blocks and galvanized wire, gland blocks stands one's ground, and correcting wedge selects metal material or harder wood quality.
As preferably, the present invention is in gland blocks galvanized wire is laid, as gland blocks length≤20cm, two place's galvanized wires are laid respectively at distance gland blocks both side ends 1.5cm, as gland blocks length >20cm, except both side ends 1.5cm lays galvanized wire, intermediate portion etc. point lay galvanized wire, and within being interposed between 20cm between ensureing.
As preferably, when the final absolute value of the present invention after galvanized wire compacting confirms, carry out complete real cylinder pressing lead wires to measure, compare with half cylinder data, bias trend is greater than to the packing of 0.10mm, the center relative to rotor overlapped in its portion adjusts, and measures shaft seal housing, low-pressure internal cylinder relative to the relative value of rotor center position, as basis of reference R value.
As preferably, the present invention gland blocks repair scrape with labyrinth clearance repetition measurement time, according to the absolute value after galvanized wire measured above compression and design load compare determine gland sealing gear herein repair the amount of scraping.
As preferably, the present invention in the modifying factor of labyrinth clearance, quantitatively consider the deadweight of ram's horn dilatancy, cylinder hang down arc, whole circle packing clearance for expansion impact and rotor rotates and oil film on the impact of rotor center position.
As preferably, the present invention is in the modifying factor of labyrinth clearance, and whether the impact of qualitative consideration gland spring tablet quality and processing and measured deviation all fall position and workmen's technological level to the impact adjusted to adjustment, the rotor dividing plate hung down in the impact of arc and dividing plate, packing dilatancy, superior hemiseptum cover.
As preferably, the present invention, when Gland Clearance in Steam Turbine is bigger than normal, needs to repair and scrapes packing " work " font surface of contact both sides back of the body arc, or require to carry out according to producer; When Gland Clearance in Steam Turbine is less than normal, need to impact both sides back of the body arc, strictly will control back of the body arc sth. made by twisting and look up and down, good to ensure packing back of the body arc sealing state; When excesssive gap or too small time, all need the gland blocks more renewed.
As preferably, gland blocks galvanized wire compacting of the present invention is as follows:
Before galvanized wire is pasted: rotor, in cylinder, by the length of adjustment two ends of rotor hoist cable, makes rotor antero posterior axis neck grease depart from bearing shell simultaneously and rises or drop on bearing shell simultaneously; Cylinder body or bearing support are installed and prevents rotor from occurring axially and the support of radial deflection, locate when rotor is in " K " value position;
Lower half portion packing galvanized wire is suppressed: will check during lifting rotor that whether the position of hoist cable and length are in original qualified position, if find in rotor dropping process rotor off-axis to or radial limiting device time, during in order to prevent trace adjustment driving, rotor part is by limit stoper collision displacement, rotor slowly should be sling until can adjust driving by trace when the minimum part of rotor departs from limit stoper to look for rotor; When determining that the galvanized wire on all gland sealing gears of cylinder lower half portion is all suppressed complete, hanging rotor, measuring lower half portion labyrinth clearance and detailed record;
Upper half part packing galvanized wire suppress: first is held ring, second hold ring, labyrinth casing, diaphragm housing ring split clean out, without high point, impulse-free robustness; With driving, the first half is overlapped lifting to put in place, when lower plane distance Lower Half cover split about the 30cm distance of first half cover, use the spacing between front cover in Straight Steel Ruler measurement cover corner, upper and lower half, made the spacing difference 1mm of their corners by adjustment chain block within, then evenly the portion of falling is overlapped; Symmetrical fastening split bolt, split gap should reach 0.05mm clearance gauge and not enter to use clearance gauge to check, then symmetry unclamps nut, and equipment, until be separated from rotor completely, is then put back to original position by slow lifting parts cover.
The present invention compared with prior art, has the following advantages and effect: technique is simple, easy to operate, by labyrinth clearance measured value digitizing, corrects rubberized fabric method in the past, by artificial experience, and the shortcoming that error is larger.The present invention has taken into full account in measurement and adjustment labyrinth clearance process, comprise the influence factor of each side such as personnel, equipment, technique, propose the corrective measure of each influence factor and revised, guaranteeing to adopt equal circumference compacting galvanized wire measure and adjust the accuracy of labyrinth clearance, reliability.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of Gland Clearance in Steam Turbine adjusting method in the embodiment of the present invention.
Fig. 2 is that the embodiment of the present invention compares according to the absolute value after the compression of measured galvanized wire and design load the schematic diagram repairing the amount of scraping determining gland sealing gear herein.
Fig. 3 a is the structural representation of ram's horn supporting structure I in the embodiment of the present invention.
Fig. 3 b is the structural representation of ram's horn supporting structure II in the embodiment of the present invention.
Fig. 4 be represent whole circle packing clearance for expansion in the embodiment of the present invention affect schematic diagram.
Fig. 5 represents in the embodiment of the present invention that rotor rotates and oil film affects schematic diagram to rotor center position.
Fig. 6 is whether the dividing plate in embodiment of the present invention superior hemiseptum cover all falls the schematic diagram of position.
Embodiment
Below in conjunction with accompanying drawing, also by embodiment, the present invention is described in further detail, and following examples are explanation of the invention and the present invention is not limited to following examples.
Embodiment.
See Fig. 1 to Fig. 6, Gland Clearance in Steam Turbine adjusting method in the present embodiment adopts the mode of circumference equal dividing compacting galvanized wire, the gap that cylinder Lower Half is enclosed within horizontal integration face place is measured by clearance gauge, the labyrinth clearance at other positions is placed on gland sealing gear by sticky for the galvanized wire of dimension, end winding support, hang rotor in working position, the sticky galvanized wire be placed on gland sealing gear is just forced out one groove mark, hang out rotor, the thickness of galvanized wire groove mark remainder is measured by labyrinth clearance measuring scale, this thickness is exactly the actual value of labyrinth clearance, actual value and design load are contrasted, draw the value that labyrinth clearance will adjust, then again Gland Clearance in Steam Turbine is adjusted according to this value.
In the present embodiment Gland Clearance in Steam Turbine adjusting method technological process and require as follows:
1) labyrinth clearance measurement and the inspection before adjusting
During gap regudation of steam sealing, unit should meet the following conditions: unit rotor fixed position, completes axle system and tentatively looks for middle adjustment, and dividing plate at different levels, gimbal, the adjustment of shaft seal housing center terminate, and each cylinder completes complete real cylinder examination and buckles rear no-float without bite.
The cleaning of gland blocks and spring sheet: gland blocks counterpart surface of contact is smooth, impulse-free robustness, and gland sealing gear is without crimping.Hollow nest not damaged, rustless, nothing dirt.Check whether spring sheet has distortion and crackle, determines that whether its elasticity is good.Tentatively carry out the measurement of the whole circle clearance for expansion of gland blocks, ensure that the whole circle of gland blocks exists gap, prevent gland blocks dieback from affecting the measurement of packing radial clearance.
Dividing plate and shaft end gland seal Tao Wawo center are measured and adjustment: after terminating in turbine shafting is looked for, and can carry out dividing plate, during the hollow nest of shaft seal looks for.Modifying factor will be considered during the centering of Wa Wo center.During adjustment gland sleeve (diaphragm housing ring, dividing plate) Lower Half both sides hangers pad, if center, hollow nest both sides adjustment amount is greater than 0.20mm, then do not allow to realize by adjusting cover both sides, portion hangers, must be come by adjustment bottom and top positioning key, after the hangers of adjustment both sides, will check, adjust the swollen gap of rising of hangers.
2) installation of correcting wedge
Gland blocks correcting wedge can select slug or the harder wooden unit of material, and gland blocks correcting wedge should confirm that gland blocks alignment clearance adjusted is complete before installing, gland blocks and the corresponding packing conduit holding ring position smooth without high point.
Hold back, ring position horizontal flange place to the absolute dimension (vernier caliper measurement) holding annular groove road according to this gland blocks at it, determine the height (correcting wedge interference 0.05-0.1mm) of correcting wedge (timber wedge) strong point
Ring or labyrinth casing 90 ° of position gland blocks are held in installation, will determine that gland blocks is less than 3mm the positional deviation of 90 ° during installation.
Timber wedge about length 30mm, the length 3-5mm of two strong points, center distance 20mm, strong point center is to the distance 20mm of nearest timber wedge end.
Every block gland blocks has two timber wedges to knock in 1/2 position to timber wedge length in two end part symmetry, and length variation is less than 2mm.Every two gland blocks apply saw blade before being about to close up or clearance gauge is clean by the Fouling Cleaning of gland blocks end face, guarantee that two vapour seal a block end face and fully can contact gapless.Adjacent gland blocks should without obvious mismatch.
After upper and lower half gland blocks installs, again should recheck, guarantee alignment clearance.
3) gland blocks galvanized wire is laid
The selection of galvanized wire: surface is smooth, circularity wants standard.The galvanized wire of respective diameters (ensureing that the decrement of galvanized wire is in 30% ~ 50% scope according to design load) is selected according to the labyrinth clearance of diverse location.
The position of galvanized wire: as gland blocks length≤20cm, two places are laid respectively at distance gland blocks both side ends 1.5cm, as gland blocks length >20cm, except laying except two places at distance gland blocks both side ends 1.5cm respectively, intermediate portions etc. point lay galvanized wire, and ensure to be interposed between therebetween within 20cm.
The shape of galvanized wire: Novel steam seal mainly contains brandon steam-glanding, Honeycomb steam seal, contact-type packing, the tooth-like packing in side comparatively widely in recent years, the working principle of packing is different, but the measurement of labyrinth clearance and adjusting method are substantially the same.For serrate-type steam seal, high tooth, space width≤3mm, adopt " V " type galvanized wire; Low tooth even number tooth, space width≤3mm, adopt " U " type galvanized wire (two meshing use " U " type galvanized wire); Low tooth, space width >3mm, adopt " V " type galvanized wire.
4) gland blocks galvanized wire compacting
Before galvanized wire is pasted: rotor, in cylinder, by the length of adjustment two ends of rotor hoist cable, makes axle journal before and after rotor substantially can depart from bearing shell simultaneously and rises or drop on bearing shell simultaneously.Cylinder body or bearing support are installed and prevents rotor from occurring axially and the support of radial deflection, locate when rotor is in " K " value position.
Lower half portion packing galvanized wire is suppressed: will check during lifting rotor that whether the position of hoist cable and length are in original qualified position, if find in rotor dropping process rotor off-axis to or radial limiting device time, during in order to prevent trace adjustment driving, rotor part is by limit stoper collision displacement, rotor slowly should be sling until can adjust driving by trace when the minimum part of rotor departs from limit stoper to look for rotor.When determining that the galvanized wire on all gland sealing gears of cylinder lower half portion is all suppressed complete, hanging rotor, measuring lower half portion labyrinth clearance and detailed record.
Upper half part packing galvanized wire suppress: by upper and lower partly hold ring (dividing plate), labyrinth casing, diaphragm housing ring split clean out without high point, impulse-free robustness.With driving, the first half is overlapped lifting to put in place, when lower plane distance Lower Half cover split about the 30cm distance of first half cover, use the spacing between front cover in Straight Steel Ruler measurement cover corner, upper and lower half, made the spacing difference 1mm of their corners by adjustment chain block within, then evenly the portion of falling is overlapped.Symmetrical fastening split bolt, split gap should reach 0.05mm clearance gauge and not enter to use clearance gauge to check, then symmetry unclamps nut, and equipment, until be separated from rotor completely, is then put back to original position by slow lifting parts cover.
During compacting galvanized wire, should note following some: (1) packs tightly mode because nozzle sets velocity stage monodentate packing adopts when assembling, and often deviating from because of packing installation quality problem, therefore labyrinth strip can be compressed into conduit when adopting pressing lead wires method to measure.And in actual motion, due to the active force of steam flow, labyrinth strip can be returned to mounting point (there will be time serious labyrinth strip obscission and packing conduit by steam flow blow loss phenomenon).To this, will carry on the back arc side in gland blocks and fix with timber wedge dead in advance, when making there is active force between gland blocks and galvanized wire, gland blocks is not drawn back and is allowed.(2) pressing lead wires method allows special messenger be responsible for, to reduce measurement error as far as possible.(3) when measuring galvanized wire groove mark remainder thickness, the chi port part of slide calliper rule needs very thin, that is must snap into the bottom extruding groove mark, otherwise the gap of measuring is greater than actual gap.If do not have Special caliper, then scene is ground, and requires that the card ground is eaten mouth and thinly should can not be damaged chi mouth again.
5) the final absolute value after galvanized wire compression confirms
(tight cylinder bolt eliminates split gap finally to carry out complete real cylinder, condenser hotwell keeps working water level, what condenser water side satisfied the requirements can water flowing) pressing lead wires confirms, carry out the measurement of labyrinth clearance, first half cylinder data compare with it, the center relative to rotor that its portion is overlapped by packing bias trend being greater than to 0.10mm adjusts, and can eliminate the impact that cylinder body rigidity and weight are measured galvanized wire.Make the making of packing radial clearance and the uniformity of producer's design load.At height, intermediate pressure cylinder rear ends shaft seal place, low-pressure final stage blade tip seal place after adjustment, measure shaft seal housing, low-pressure internal cylinder relative to the relative value of rotor center position, as the basis of reference R value judging cylinder inner gland gap displacement amount afterwards.
After unit completes formal button cylinder, after the adjustment of axle system, all should monitor the variable quantity of R value, if the data deviation trend of two states is greater than 0.10mm, the central position of cylinder relative to rotor should be done to adjust according to data, hang down arc, rotor of the entirety deadweight eliminating button cylinder rear-bank rotor housing and connecting tube hangs down arc, the generation of internal stress, the impact of axle system adjustment on cylinder inner gland radial clearance.
Labyrinth clearance state and original galvanized wire can be made to suppress numerical value by final adjustment to conform to.Thus ensure that the accurate adjustment of labyrinth clearance, ensure that labyrinth clearance end-state suppresses conforming to of numerical value with original galvanized wire.
6) gland blocks is repaiied and is scraped and labyrinth clearance repetition measurement
Shown in Fig. 2, according to the absolute value after galvanized wire measured above compression and design load compare determine gland sealing gear herein repair the amount of scraping.After gland sealing gear is all repaiied and is scraped, repetition measurement is carried out in reply labyrinth clearance, again carrying out galvanized wire laying, compacting, surveying work to gland sealing gear, then confirming for meeting the labyrinth clearance value that producer requires, the gland blocks not reaching design load for Individual gaps is carried out secondary and is repaiied and scrape.
In the present embodiment, the modifying factor of the labyrinth clearance of Gland Clearance in Steam Turbine adjusting method is as follows:
1, the impact of ram's horn dilatancy.Upper cylinder half ram's horn supporting way is little, and less on the impact of labyrinth clearance.Steam turbine mostly is lower cylinder ram's horn supporting way, lower cylinder ram's horn supporting plane is lower than unit centre line, during unit operation, ram's horn temperature is higher than bearing support temperature, cylinder inner gland Wa Wo center is raised, cylinder lower half portion integral raising, cause packing underclearance to reduce, produce time serious and touch mill, top gland leak-off amount obviously strengthens.Wherein, Wa Wo raises at center the height of numerical value and ram's horn, temperature, material are relevant, therefore need when measuring labyrinth clearance to be revised, its correction value is the shaft seal Wa Wo center variable quantity that ram's horn temperature variation causes: Δ H=a × H × Δ t, wherein: H is ram's horn height, a is ram's horn linear expansion coeffcient.Namely labyrinth clearance, bottom reduces Δ H, and labyrinth clearance, top increases Δ H.
Fig. 3 a and Fig. 3 b represents ram's horn supporting structure I and ram's horn supporting structure II respectively, according to concrete ram's horn supporting structure, if the unit of supporting structure II, then swell increment is up and down offset, ram's horn thermal expansion can be ignored the impact at Wa Wo center, specifically according to the requirement about ram's horn swell value in design, reserve influence value.
2, the impact of gland spring tablet quality.Seal-spring is located in high temperature environments for a long time, and part shell fragment elasticity weakens.Packing shell fragment elastic force diminishes or disappears, the shell fragment that must more renew.During pressing lead wires, batten on the wedge of two ends, every block packing back side, prevents shell fragment from making a concession and causes false gap.
3, processing and measured deviation are on the impact of adjustment.
Less than normal for labyrinth clearance, need go out high point, the height gone out some length >=5mm at back of the body arc, too short rear height point can reduce through touching mill.Repairing of arc of the packing back of the body is scraped, and is all manually repair to scrape in the past.Manually repair and scrape uneven thickness, and can not remove root, after now adopting lathe machinery on professional mold to repair to scrape, back of the body arc working surface precision is high, and root also can be removed.Or use special gland seal clearance adjusting device to process, now centering is more difficult.Particularly gland blocks two ends amount of finish different or added by centering the adjustment pad validity that all can have influence on gap regudation of steam sealing such as too many.
4, the impact of the vertical arc of cylinder deadweight.
Cylinder internal partition loads more, and the vertical arc of lower cylinder near intermediate portion is larger; Under making the hollow nest center deviation of packing; If be measure labyrinth clearance, bottom at this, after so detaining cylinder, cylinder junction plane gap is little, and the rigidity of lower cylinder is increased, and the arc that hangs down reduces, and second labyrinth clearance diminishes, and first labyrinth clearance becomes large, likely causes labyrinth clearance to exceed standard.
Stand-off thread cylinder is adopted to draw steel wire to measure cylinder amount of deformation, namely do not fill high, in, in low pressure, lower semi-diaphragm (pour water to higher than normal water level by low pressure (LP) cylinder Steam Side of Condenser, dry run state as far as possible), draw steel wire, the complete real cylinder of measuring recording respectively, high under half real cylinder state, in, the hollow nest centre data of low pressure (LP) cylinder internal sleeve, and calculate the variable quantity (be cylinder hang down arc correction value) at each Bu Taowawo center, and the arc correction Plotting data that hung down by each hollow nest recorded goes out the packing adjustment correction value curve that is similar to deflection curve, and according to this correction value curve, find septalium at different levels, the packing at the positions such as the hollow nest of blade tip seal groove and shaft seal is intended adjust the play and to be hung down arc correction data.
For lower cylinder, to revise, presetting under half real cylinder state to labyrinth clearance, the labyrinth clearance that should adjust under half real cylinder state=labyrinth clearance standard+cylinder hangs down arc correction value.
For casing top half, adopt the method in respective diaphragms or cylinder junction plane cushioning, simulate the gap of the upper and lower cylinder diaphragm gland of complete real cylinder state, the thickness of cushioning is still the cylinder deformation numerical quantity of this position, finally carries out an acceptance inspection with this labyrinth clearance.
5, rotor hangs down the impact of arc.
In overhaul of steam turbine process, rotor will place a period of time on rotor field spider, because rotor deadweight is by vertical for generation arc, so rotor regularly will be coiled dynamic 180 ° on falsework before measurement labyrinth clearance, measures after vertical arc elimination again.
6, the impact of dividing plate, packing dilatancy.
In unit operation, dividing plate and the distortion of packing high-temperature expansion, the arc making gland blocks locate convex shoulder and diaphragm gland groove is misfitted, and therefore, the location convex shoulder of gland blocks can not carry out repairing scraping as desirable circular arc line.
7, the impact of whole circle packing clearance for expansion.
As shown in Figure 4, labyrinth clearance is bigger than normal, and the Steam seal back profile amount of scraping is B, labyrinth clearance is little, it is A that chisel need go out high point value, and after visible gap regudation of steam sealing, the circumference circle (L is different at 1,2,3 places) often changing steam seal ring destroys the state of former steam seal ring; When the clearance for expansion of gland blocks is bigger than normal, can by the new gland blocks of parts replacement.When clearance for expansion is less than normal, car removes gland blocks end face superscale.Attention: ensure that gland blocks end face wants flat smooth, do not allow to occur mismatch, adjacent gland blocks end contact is good, and 0.05mm clearance gauge does not enter, to ensure sealability.
8, rotor rotation and oil film are on the impact of rotor center position.Rotor normally runs between intermediate bushing and rotor can form certain thickness oil film, and rotor makes the position at rotor operation center change after rotating.Oil slick thickness is about 0.08mm ~ 0.22mm.
In operation, turbine rotor is not in bearing bush center position, but the side of deflection sense of rotation.General side-play amount A value is at 0.1 ~ 0.3mm, and the thicker side-play amount of axle journal is larger.Therefore, 0.1 ~ 0.15mm gap can be reserved in left side, corresponding in minimizing 0.1 ~ 0.15mm gap, right side.Or the hollow nest value of dividing plate 0.1mm more than right side on the left of can allowing.See that packing is not a full circle like this, but will full circle be become during rotor operation.
Whether the dividing plate 9, in superior hemiseptum cover all falls position.Partition board of steam turbine is made up of upper and lower two halves.There is positioning key at first two ends, when superior hemiseptum is fallen in lower semi-diaphragm, just by positioning key location, two semiclapboards are overlapped.In maintenance process, key and keyway are easily touched out burr, and during pressure packing, upper clapboard key is blocked by burr, makes upper clapboard not fall position, cause upper clapboard labyrinth clearance to become large mistakenly.Pressure packing before check that there is impulse-free robustness on upper and lower dividing plate mating face, jagged need by its equating.In order to check upper and lower dividing plate whether to combine tightly, upper red lead being touched in upper clapboard key both sides, does not hang in rotor and upper clapboard is hung in cylinder, with the every one-level dividing plate of 0.05mm thick clearance gauge inspection in conjunction with situation.For the dividing plate of gap overroof, repair filing key or keyway according to red lead contact situation.During pressure gap, after diaphragm housing ring mating face bolton is complete, beats superior hemiseptum cover convex surface, superior hemiseptum can be prevented to be stuck in diaphragm housing ring.As shown in Figure 6.
10, workmen's technical merit is on the impact of adjustment.
(1) in the process of installing upper baffle plate and diaphragm housing ring, if the tight power of horizontal flange bolt is inadequate, can not ensure that split gap reaches 0.05mm clearance gauge and do not enter, then first labyrinth clearance measured value is bigger than normal.
(2) if the gland blocks of installing exists crimping, burr, should meticulously process, rounding off is answered in the joint of each section of gland sealing gear, must not have mismatch, and adjacent gland blocks end contact wants good.
(3) pin gap at the bottom of dividing plate, diaphragm housing ring is large, the bad accuracy that also can affect labyrinth clearance and measure of dividing plate hangers contact.
(4) when adjusting gland blocks back of the body arc place pad, the pad installed additional is too much unsuitable, and notices that pad can not give prominence to back of the body arc root T-shaped line of rabbet joint plane.
In addition, it should be noted that, the specific embodiment described in this specification, the shape, institute's title of being named etc. of its parts and components can be different, and the above content described in this specification is only to structure example of the present invention explanation.The equivalence change that structure, feature and the principle of all foundations described in inventional idea of the present invention are done or simple change, be included in the protection domain of patent of the present invention.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment; only otherwise depart from structure of the present invention or surmount this scope as defined in the claims, protection scope of the present invention all should be belonged to.
Claims (10)
1. a Gland Clearance in Steam Turbine adjusting method, it is characterized in that: described method adopts the mode of circumference equal dividing compacting galvanized wire, the gap that cylinder Lower Half is enclosed within horizontal integration face place is measured by clearance gauge, the labyrinth clearance at other positions is placed on gland sealing gear by sticky for the galvanized wire of dimension, end winding support, hang rotor in working position, the sticky galvanized wire be placed on gland sealing gear is just forced out one groove mark, hang out rotor, the thickness of galvanized wire groove mark remainder is measured by labyrinth clearance measuring scale, this thickness is exactly the actual value of labyrinth clearance, actual value and design load are contrasted, draw the value that labyrinth clearance will adjust, then again Gland Clearance in Steam Turbine is adjusted according to this value.
2. Gland Clearance in Steam Turbine adjusting method according to claim 1, is characterized in that: measure in labyrinth clearance and before adjustment, tentatively need look for middle adjustment axle system, cleaning gland blocks and spring sheet, measures and adjusts dividing plate and shaft end gland seal Tao Wawo center.
3. Gland Clearance in Steam Turbine adjusting method according to claim 1, it is characterized in that: fixing dead with correcting wedge in advance in gland blocks back of the body arc side, when having an active force between gland blocks and galvanized wire, gland blocks stands one's ground, and correcting wedge selects metal material or harder wood quality.
4. Gland Clearance in Steam Turbine adjusting method according to claim 1, it is characterized in that: in gland blocks galvanized wire is laid, as gland blocks length≤20cm, two place's galvanized wires are laid respectively at distance gland blocks both side ends 1.5cm, as gland blocks length >20cm, except both side ends 1.5cm lays galvanized wire, intermediate portion etc. point lay galvanized wire, and within being interposed between 20cm between ensureing.
5. Gland Clearance in Steam Turbine adjusting method according to claim 1, it is characterized in that: when the final absolute value after galvanized wire compacting confirms, carry out complete real cylinder pressing lead wires to measure, compare with half cylinder data, bias trend is greater than to the packing of 0.10mm, the center relative to rotor overlapped in its portion adjusts, and measures shaft seal housing, low-pressure internal cylinder relative to the relative value of rotor center position, as basis of reference R value.
6. Gland Clearance in Steam Turbine adjusting method according to claim 1, is characterized in that: gland blocks repair scrape with labyrinth clearance repetition measurement time, according to the absolute value after galvanized wire measured above compression and design load compare determine gland sealing gear herein repair the amount of scraping.
7. Gland Clearance in Steam Turbine adjusting method according to claim 1, it is characterized in that: in the modifying factor of labyrinth clearance, quantitatively consider the deadweight of ram's horn dilatancy, cylinder hang down arc, whole circle packing clearance for expansion impact and rotor rotates and oil film on the impact of rotor center position.
8. Gland Clearance in Steam Turbine adjusting method according to claim 1, it is characterized in that: in the modifying factor of labyrinth clearance, whether the impact of qualitative consideration gland spring tablet quality and processing and measured deviation all fall position and workmen's technological level to the impact adjusted to adjustment, the rotor dividing plate hung down in the impact of arc and dividing plate, packing dilatancy, superior hemiseptum cover.
9. Gland Clearance in Steam Turbine adjusting method according to claim 1, is characterized in that: when Gland Clearance in Steam Turbine is bigger than normal, needs to repair to scrape packing " work " font surface of contact both sides back of the body arc, or requires to carry out according to producer; When Gland Clearance in Steam Turbine is less than normal, need to impact both sides back of the body arc, strictly will control back of the body arc sth. made by twisting and look up and down, good to ensure packing back of the body arc sealing state; When excesssive gap or too small time, all need the gland blocks more renewed.
10. Gland Clearance in Steam Turbine adjusting method according to claim 1, is characterized in that: the compacting of gland blocks galvanized wire is as follows:
Before galvanized wire is pasted: rotor, in cylinder, by the length of adjustment two ends of rotor hoist cable, makes rotor antero posterior axis neck grease depart from bearing shell simultaneously and rises or drop on bearing shell simultaneously; Cylinder body or bearing support are installed and prevents rotor from occurring axially and the support of radial deflection, locate when rotor is in " K " value position;
Lower half portion packing galvanized wire is suppressed: will check during lifting rotor that whether the position of hoist cable and length are in original qualified position, if find in rotor dropping process rotor off-axis to or radial limiting device time, during in order to prevent trace adjustment driving, rotor part is by limit stoper collision displacement, rotor slowly should be sling until can adjust driving by trace when the minimum part of rotor departs from limit stoper to look for rotor; When determining that the galvanized wire on all gland sealing gears of cylinder lower half portion is all suppressed complete, hanging rotor, measuring lower half portion labyrinth clearance and detailed record;
Upper half part packing galvanized wire suppress: first is held ring, second hold ring, labyrinth casing, diaphragm housing ring split clean out, without high point, impulse-free robustness; With driving, the first half is overlapped lifting to put in place, when lower plane distance Lower Half cover split about the 30cm distance of first half cover, use the spacing between front cover in Straight Steel Ruler measurement cover corner, upper and lower half, made the spacing difference 1mm of their corners by adjustment chain block within, then evenly the portion of falling is overlapped; Symmetrical fastening split bolt, split gap should reach 0.05mm clearance gauge and not enter to use clearance gauge to check, then symmetry unclamps nut, and equipment, until be separated from rotor completely, is then put back to original position by slow lifting parts cover.
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| CN201510838161.2A CN105317471A (en) | 2015-11-26 | 2015-11-26 | Turbine steam seal clearance adjustment method |
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| CN108072308A (en) * | 2017-09-05 | 2018-05-25 | 中国电建集团河南工程有限公司 | Large turbine-generator set shafting radial clearance measures and method of adjustment |
| CN108362501A (en) * | 2017-12-27 | 2018-08-03 | 中国航发四川燃气涡轮研究院 | A kind of rack installation method for aviation axial flow compressor performance test |
| CN110307046A (en) * | 2019-07-03 | 2019-10-08 | 华西能源工程有限公司 | A method of eliminating large-size steam turbine cylinder deformation influences |
| CN110761854A (en) * | 2019-11-11 | 2020-02-07 | 福能(贵州)发电有限公司 | Offset mounting method of small-gap steam seal 660MW steam turbine |
| CN112360582A (en) * | 2020-10-27 | 2021-02-12 | 国电泉州热电有限公司 | High-medium-pressure non-dummy shaft final assembly method for remanufacturing unit |
| CN113914939A (en) * | 2021-08-31 | 2022-01-11 | 华能国际电力股份有限公司丹东电厂 | Steam seal gap adjusting method for steam turbine set |
| CN114608419A (en) * | 2022-05-10 | 2022-06-10 | 安徽皖能电力运营检修有限公司 | Through-flow clearance measuring tool for steam turbine cylinder of thermal power plant |
| WO2023273053A1 (en) * | 2021-06-30 | 2023-01-05 | 中国电建集团山东电力建设第一工程有限公司 | Overall supply type high-pressure cylinder facilitating measurement of dynamic and static positions, and method |
| WO2023216527A1 (en) * | 2022-05-09 | 2023-11-16 | 中国电建集团山东电力建设第一工程有限公司 | Appliance for accurately detecting tilting pad clearance of steam turbine generator set of power station and use method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108072308A (en) * | 2017-09-05 | 2018-05-25 | 中国电建集团河南工程有限公司 | Large turbine-generator set shafting radial clearance measures and method of adjustment |
| CN108362501A (en) * | 2017-12-27 | 2018-08-03 | 中国航发四川燃气涡轮研究院 | A kind of rack installation method for aviation axial flow compressor performance test |
| CN110307046A (en) * | 2019-07-03 | 2019-10-08 | 华西能源工程有限公司 | A method of eliminating large-size steam turbine cylinder deformation influences |
| CN110761854A (en) * | 2019-11-11 | 2020-02-07 | 福能(贵州)发电有限公司 | Offset mounting method of small-gap steam seal 660MW steam turbine |
| CN112360582A (en) * | 2020-10-27 | 2021-02-12 | 国电泉州热电有限公司 | High-medium-pressure non-dummy shaft final assembly method for remanufacturing unit |
| CN112360582B (en) * | 2020-10-27 | 2023-01-03 | 国电泉州热电有限公司 | High-medium-pressure non-dummy shaft final assembly method for remanufacturing unit |
| WO2023273053A1 (en) * | 2021-06-30 | 2023-01-05 | 中国电建集团山东电力建设第一工程有限公司 | Overall supply type high-pressure cylinder facilitating measurement of dynamic and static positions, and method |
| CN113914939A (en) * | 2021-08-31 | 2022-01-11 | 华能国际电力股份有限公司丹东电厂 | Steam seal gap adjusting method for steam turbine set |
| WO2023216527A1 (en) * | 2022-05-09 | 2023-11-16 | 中国电建集团山东电力建设第一工程有限公司 | Appliance for accurately detecting tilting pad clearance of steam turbine generator set of power station and use method therefor |
| CN114608419A (en) * | 2022-05-10 | 2022-06-10 | 安徽皖能电力运营检修有限公司 | Through-flow clearance measuring tool for steam turbine cylinder of thermal power plant |
| CN114608419B (en) * | 2022-05-10 | 2022-09-30 | 安徽皖能电力运营检修有限公司 | Through-flow clearance measuring tool for steam turbine cylinder of thermal power plant |
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