CN107313816B - A kind of T Steam Turbine SI measuring device and measuring method - Google Patents
A kind of T Steam Turbine SI measuring device and measuring method Download PDFInfo
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- CN107313816B CN107313816B CN201710668263.3A CN201710668263A CN107313816B CN 107313816 B CN107313816 B CN 107313816B CN 201710668263 A CN201710668263 A CN 201710668263A CN 107313816 B CN107313816 B CN 107313816B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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Abstract
The present invention relates to a kind of T Steam Turbine SI measuring device and measuring method, including by the sequentially connected exciter of jackshaft, generator, thrust bearing working face, low pressure (LP) cylinder, intermediate pressure cylinder, high pressure cylinder, front bearing box, jackshaft leans on bearing support；Vibration probe is mounted on bearing side, and differential expansion probe is mounted on thrust bearing working face side, and axial displacement probe is mounted on fore bearing axis measuring surface side；The various probes are connect with sensor, fore-lying device, measurement fastener, DCS system, ETS system in succession; vibration, differential expansion, axial displacement crisis signal pass through output loop respectively and pass to relay; improve the reliability of T Steam Turbine SI system; reduce the probability of steam turbine maloperation; equipment damage probability is reduced, is increased economic efficiency.
Description
Technical field
The present invention relates to Turbine Safeties to monitor field, is a kind of T Steam Turbine SI measuring device and measurement side specifically
Method.
Background technique
Turbine Safety monitoring and protection system (TSI) can continuously monitor the various parameters of steam turbine, as differential expansion, vibration,
Displacement etc., help operations staff distinguish mechanical disorder so that these failures cause it is badly damaged before can shut down in time, guarantee machine
Group safety, therefore, its reliability, accuracy, safety are directly related to the safe operation of whole unit.
Prior art differential expansion protection mechanism is as follows:
As shown in Figure 1 and Figure 4, it in compensation differential expansion detection, is measured using 35mm eddy current probe, differential expansion probe
The half of DE1 ' and differential expansion probe each responsible measuring range of DE2 ', probe DE1 ' and differential expansion probe DE2 ' two probe are using opposite peace
Dress will necessarily move closer to differential expansion probe DE2 ', this pops one's head in the process when target surface is gradually distance from probe differential expansion probe DE1 '
The gap voltage of DE1 ' can gradually rise, and the gap voltage of differential expansion probe DE2 ' can gradually decrease, two differential expansion probe gap electricity
Lower probe is current measuring probe in pressure value, therefore the DE1 ' and differential expansion probe DE2 ' two that pops one's head in pops one's head in only one differential expansion value
Output.
Differential expansion relay protective scheme is as follows:
It swells when exceptional value I value as shown in figure 9, being on duty, crisis signal send DCS system record data and alarms；It is on duty
It swells when dangerous values II value, crisis signal passes to ETS system protection chaser by output loop and alarms.
But it is difficult to accomplish two probe gap voltages when target surface is in an intermediate position in practical applications while reaches intersection
Voltage value, thus often will appear in actual measurement since crossover voltage is difficult to constant in the actual process, cause currently to survey
Amount probe is popped one's head in differential expansion to be switched between DE1 ' and differential expansion probe DE2 ', and measurement result inaccuracy causes to report by mistake, and system-down is protected
Shield, causes economic loss.
Secondly, as shown in Figure 5 and Figure 6, according to single probe measurement, on thrust bearing working face 3 ' and two sides central axis
The distance between circular hub 10 be 95mm, and the minimum length of Bentley 35mm eddy current probe DE1 ' is 73.66mm, steamer
Design range Δ E=25mm of machine differential expansion detection, calculate it is found that probe moving area be 95mm-73.66mm=21.34mm,
It is unable to satisfy design range Δ E=25mm requirement.
Therefore, as shown in fig. 7, differential expansion probe DE1 ' is mounted on circular hub 10 ' with exterior domain, i.e. shadow part in Fig. 6
Subregion, the vortex sheet diameter of Bentley 35mm eddy current probe DE1 ' are 38.10mm, in order to guarantee that the safety of differential expansion probe is surveyed
Amount, it is proposed that minimum target surface as shown in fig. 7, should be not less than 67mm, and in Fig. 6 dash area region be width 40mm annulus, no
It is able to satisfy minimum target surface requirement, thus the compensation differential expansion detection of 35mm is limited by mounting condition.
35mm eddy current probe DE1 ' is installed in the prior art, since installation site does not have enough spaces, probe can be because big
When axis is mobile, wheel hub encounters probe and causes tip damage, or even damage turbine rotor, brings great economy to damage to thermal power plant
It loses.
Prior art rotor position protection mechanism is as follows:
It sees from front bearing box 7 ' to 2 ' direction of generator, 45 ° of right side direction is X-direction, and 45 ° of left side direction is Y-direction.
As shown in Fig. 1 and Figure 11, fore bearing axis measuring surface 701 ' is equipped with fastener 7X ' in X-direction in the prior art, in the side Y
To equipped with fastener 7Y '；Fastener 7X ' above it is fixed there are two displacement probe ZY3 ' and ZY4 ', fastener 7Y ' above fixed there are two displacements to visit
Head ZY1 ' and ZY2 '.
Turbine shaft axial displacement protection logic is as follows:
As shown in figure 13, when probe ZY3 ' and probe ZY4 ' are more than axial displacement critical value III value, or probe simultaneously
When ZY1 ' and probe ZY2 ' are more than axial displacement critical value III value simultaneously, crisis signal passes to ETS system by output loop
Protection chaser is simultaneously alarmed.
The mistake of triggering axial displacement chaser protection when two axial displacement signals of any of the above-described fastener all reach dangerous values
Journey has the following problems: in 1. steam turbine operations, it may be possible to which signal processing card is faulty and leads to handled by the fastener two
Abnormal signal then may mistaking signal chaser；2. if X pops one's head in any of fastener and any spy in Y-direction fastener
Head breaks down, and when real axis displacement alreadys exceed critical value V value, due to a certain probe failure, then will appear refusal and jumps
Machine, it would be possible to immeasurable loss can be brought to steam turbine.
Prior art bear vibration protection mechanism is as follows:
It sees from front bearing box 7 ' to 2 ' direction of generator, 45 ° of right side direction is X-direction, and 45 ° of left side direction is Y-direction.
As shown in Fig. 1 and Figure 14, Relative Vibration probe B VY ' and the side Y of Y-direction are above equipped in bearing 8 ' in the prior art
To absolute vibration probe B V '.
Turbine vibration supervision logic is as follows:
As shown in figure 16, when the absolute vibration of vibration probe BV ' monitoring is greater than V value or vibration probe BVY ' monitoring
When Relative Vibration is greater than V value, crisis signal passes to ETS system protection chaser by output loop and alarms.
Above-mentioned vibration measurement is using single measuring point protection, and the monitor value of any probe is more than the vibration critical that steam turbine allows
Value, ETS system protect chaser immediately.But during steam turbine operation, because absolutely reference point or opposite reference point becomes
Change, leading to the output signal that the absolute vibration of Y-direction is popped one's head in and the Relative Vibration of Y-direction is popped one's head in is more than critical value, at this time will
It causes protection signal accidentally to send out, needs shutdown inspection, production is caused to be obstructed and economic loss.
Summary of the invention
For steam turbine existing in the prior art problem easy to operate by mistake, the present invention adopts the following technical scheme:
The T Steam Turbine SI measuring device, including pass through the sequentially connected exciter of jackshaft, generator, thrust bearing
Working face, low pressure (LP) cylinder, intermediate pressure cylinder, high pressure cylinder, front bearing box, if being equipped with dry bearing on jackshaft, before being equipped in front bearing box
Bearing axis measuring surface is popped one's head in the side of thrust bearing working face equipped with differential expansion, and axial displacement probe is mounted on the survey of fore bearing axis
Amount face side, vibration probe are mounted on bearings side.
Turbine system is equipped with 8 bearings altogether, is used to support steamer mechanism member, and two sections of each steamer mechanism member has one
A bearing is provided with identical vibration probe on each bearing.Whole system can be precisely rapidly to monitoring steam turbine operation
The differential expansion that occurs in the process, axial displacement, vibration signal, pass to DCS system, ETS system by output loop.According to voltage
The range of changing value is different, and DCS system carries out data record and simultaneously alarms, and voltage value is excessively high, then ETS system protection chaser and reports
It is alert.
Further, it pops one's head in the X-direction of thrust bearing working face equipped with the first differential expansion, Y-direction is visited equipped with the second differential expansion
Head, and the detection direction of the first differential expansion probe, the second differential expansion probe is perpendicular to thrust bearing working face.
To generator direction in terms of front bearing box, 45 ° of right side direction is X-direction, and 45 ° of left side direction is Y-direction, and first is poor
Swollen probe, the second differential expansion probe are positioned close to the side of front bearing box.Compare the prior art, and the present invention is surveyed using single probe
Amount is respectively set a differential expansion probe in furnace side and electric side, using single probe measurement, while exporting two signals, reduce existing
Having in technology leads to the probability for measuring the false tripping machine that indicating value jump occurs due to probe switching, improves the reliable of differential expansion protection
Property, reduce the workload and economic loss of maintenance personal.
Further, the fore bearing axis measuring surface is equipped with the X-direction fastener and Y-direction parallel with fore bearing axis measuring surface
Fastener；
X-direction fastener is fixed, and there are two third axial displacement probes and the 4th axial displacement probe；
It is fixed on Y-direction fastener that there are two first axis displacement probes and the second axial displacement to pop one's head in；
First axis displacement probe, the second axial displacement probe, third axial displacement probe and the 4th axial displacement probe
Detection direction perpendicular to fore bearing axis measuring surface.
To generator direction in terms of front bearing box, 45 ° of right side direction is X-direction, and 45 ° of left side direction is Y-direction, and displacement is visited
Head is positioned close to the side of front bearing box.It will be on any displacement probe and Y-direction fastener on X-direction fastener in the present invention
Any probe signal is associated, solves in the prior art since the false tripping machine and side fastener of side fastener exception are taken up an official post
One probe failure and refuse chaser protection the phenomenon that, improve steam turbine displacement protection accuracy, reduce the work of maintenance personal
Amount and economic loss.
Further, there are three vibration probes, it is respectively: the first Relative Vibration probe of X-direction, the second phase of Y-direction
To the absolute vibration probe of vibration probe and Y-direction, and three vibration probes are axially vertical with jackshaft.
The present invention increases the first Relative Vibration probe an of X-direction at each bearing, compares and shakes in the prior art
Dynamic protection is only single measuring point protection of Y-direction, the present invention by the first Relative Vibration probe of X-direction respectively with Y-direction second
The absolute vibration of Relative Vibration probe and Y-direction, which is popped one's head in, to link, and improves the accuracy of steam turbine displacement protection, reduces maintenance personal
Workload and economic loss.
Further, the measurement method includes differential expansion protection method, rotor position protection measurement method, bearing vibration
Dynamic protection method；
The exceptional value range for defining steam turbine differential expansion Δ E is I value, and dangerous values range is II value；
Definition steam turbine axial displacement L dangerous values range is III value；
The bear vibration amplitude Δ V critical value of steam turbine X-direction is set as IV value, the bear vibration critical value of Y-direction is V
Value；
The protection process of differential expansion protection method is as follows:
S11: when electric side differential expansion is in range I value；Or
In range I value, differential expansion crisis signal passes to DCS system record data by output loop and reports for furnace side differential expansion
It is alert；
S12: when electric side differential expansion is in range I value, and furnace side differential expansion is in range II value；Or
Furnace side differential expansion is in range I value, and electric side differential expansion, in range II value, differential expansion crisis signal is transmitted by output loop
It to ETS system and alarms, steam turbine is made to trip, close all steam turbine intake valves；
The displacement that first axis displacement probe measures is defined as first axis displacement；The position that second axial displacement probe measures
Moving is the second axial displacement；The displacement that third axial displacement probe measures is third axial displacement；4th axial displacement probe is surveyed
The displacement obtained is the 4th axial displacement；
The protection process of rotor position protection measurement method is as follows:
S21: when third axial displacement and first axis displacement are simultaneously in range III value；Or
Third axial displacement and the second axial displacement are simultaneously in range III value；Or
4th axial displacement and first axis displacement are simultaneously in range II value；Or
4th axial displacement and the second axial displacement in range III value, vibrate crisis signal and pass through output loop simultaneously
ETS system is passed to, steam turbine is made to trip and alarm, closes all steam turbine intake valves.
The protection process of bear vibration protection method is as follows:
S31: when bearing Y-direction absolute vibration be greater than V value, and X-direction Relative Vibration be greater than IV value；Or
Bearing Y-direction Relative Vibration be greater than V value, and X-direction Relative Vibration be greater than IV value when, vibration crisis signal pass through it is defeated
Circuit transmission gives ETS system out, and steam turbine is made to trip and alarm, and closes all steam turbine intake valves.
When carrying out differential expansion protection, DCS system record differential expansion data are simultaneously alarmed, when electric side differential expansion probe, i.e. the second differential expansion
Probe and furnace side differential expansion are popped one's head in, i.e. when exceptional value I value occurs in any probe signal in the first differential expansion probe, so that it may pass through sensing
Differential expansion signal is transformed into voltage change and exports and record by device, fore-lying device, and service personnel only needs periodically to check analysis, section
About maintenance time.
ETS system carries out chaser protection when dangerous situation occurs in steam turbine, and electric side differential expansion probe DE2 and furnace side differential expansion are visited
In the head probe of DE1 two, there is exceptional value I value in one of probe, and another is popped one's head in when there is dangerous values II value, indicates thrust
Bearing working face had already appeared extremely before there is dangerous working condition, can exclude because probe faults itself or mounting structure loosen
Deng possibility, compares under the prior art, judge whether dangerous values II value occur by unique output signal, improve the accurate of judgement
Property, reduce economic loss.
Any displacement on any displacement probe and Y-direction fastener when carrying out rotor position protection, on X-direction fastener
When popping one's head in while dangerous values III value occur, maintenance personal can judge that steam turbine needs maintenance and inspection at this time.Compared to existing skill
Under art, by two probes on any fastener while there is dangerous values III value and determine to shut down, technical solution of the present invention avoid because
A certain fastener causes mistakenly stop machine or a certain probe failure to cause to refuse the case where shutting down extremely, improves the accurate of axial displacement judgement
Degree reduces economic loss.
When carrying out bear vibration protection, the first Relative Vibration probe of X-direction is increased, when X-direction vibration probe goes out
Existing exceptional value IV value, and there is dangerous values V in any vibration probe in the second Relative Vibration of Y-direction probe and absolute vibration probe
Value, indicate bearing exception has been had already appeared before there is dangerous working condition, can be discharged probe because external reference points variation or
The possibility for failure of popping one's head in itself, compare the prior art, only by a certain probe dangerous values V value mistakenly stop machine of Y-direction, improves
The reliability of bear vibration protection, reduces economic loss.
Further, differential expansion probe uses Bentley 50mm eddy current probe, differential expansion Δ E range be -5mm≤Δ E≤
20mm。
Bentley 50mm eddy current probe, probe length 49.5mm, the range of linearity of single 50mm eddy current probe are 1.3mm
To 29.2mm, measuring range 27.9mm, it is able to satisfy design range Δ E=25mm of steam turbine differential expansion detection.By Bentley 50mm
Eddy current probe is mounted between thrust bearing working face and wheel hub, is calculated it is found that the measurable range of 50mm eddy current probe is
95mm-49.5mm=45.5mm meets design range Δ E=25mm of steam turbine differential expansion detection.
Further, differential expansion variation zero-bit is Δ E=5mm；I value refers to -2mm≤Δ E≤15mm；II value refers to -5mm≤Δ E
< -2mm and 15mm < Δ E≤20mm.
Steam turbine is a kind of equipment of high-precision, the generation of differential expansion mainly due to the degrees of expansion of rotor and cylinder not
Unanimously.When vibration occurs for big shaft position, when leaving thrust bearing working face, differential expansion detection value is set as positive value display, i.e. 0mm <
ΔE≤20mm；When thrust bearing working face is worn, and axial direction working face direction is mobile greatly, measured value, which is shown, at this time is negative
Value, i.e. -5mm≤Δ E≤0mm.In general, when measuring accurately and zero-bit installation meets specification, there is negative value in differential expansion detection
Illustrate thrust bearing shoe valve work and has occurred that abrasion.According to being zero-bit at Δ E=0mm, then the protection definite value of zero-bit two sides is uneven
Weighing apparatus.For the needs for the protection definite value for balancing positive and negative both sides, it is at Δ E=5mm, close to the one of zero-bit that setting differential expansion, which changes zero-bit,
Section is exceptional value I value, and one section far from zero-bit is dangerous values II value, that is, I value refers to -2mm≤Δ E≤15mm；II value refer to -5mm≤
Δ E < -2mm and 15mm < Δ E≤20mm.
Further, the axial displacement -1.1mm < Δ L < 0.8mm of permission, as axial displacement L≤- 1.1mm or Δ L
When >=0.8mm, this range is the dangerous values III value of axial displacement.
Further, in bear vibration amplitude Δ V, IV value refers to Δ V=0.127mm；When Relative Vibration, V value refers to Δ V1=
0.254mm；When absolute vibration, V value refers to Δ V2=0.30mm。
Bearing absolute vibration refers to vibration of the bearing rotor relative to ground, and Relative Vibration refers to that rotor is visited relative to vibration
The vibration of head, since vibration probe bracket is typically mounted on bearing or axis, so Relative Vibration is it can be appreciated that turn
Vibration of the son relative to bearing or bearing block, therefore, absolute vibration Amplitude Ration Relative Vibration amplitude are big.
Compared with prior art, the present invention proposes a kind of T Steam Turbine SI measuring device, improves T Steam Turbine SI system
Reliability reduces the several of steam turbine maloperation in the protection of the differential expansion protection of steam turbine, rotor position protection and bear vibration
Rate improves the reliability and accuracy of monitoring, reduces equipment damage probability, increases economic efficiency.
Detailed description of the invention
Fig. 1 is prior art host TSI system measuring point distribution schematic diagram.
Fig. 2 is host TSI system measuring point distribution schematic diagram of the present invention.
Fig. 3 is X, Y-direction schematic diagram in the present invention.
Fig. 4 is probe positions schematic diagram in the compensation mensuration of differential expansion.
Fig. 5 is probe positions schematic diagram in single differential expansion detection method.
Fig. 6 is differential expansion probe installation space schematic diagram.
Fig. 7 is to recommend minimum target surface scale diagrams in differential expansion detection method.
Fig. 8 is differential expansion probe installation location schematic diagram of the present invention.
Fig. 9 is prior art differential expansion relay protective scheme figure.
Figure 10 is differential expansion relay protective scheme figure of the present invention.
Figure 11 is bear vibration probe installation location schematic diagram of the present invention.
Figure 12 is prior art bear vibration relay protective scheme figure.
Figure 13 is bear vibration relay protective scheme figure of the present invention.
Figure 14 is axial displacement probe schematic view of the mounting position in the present invention.
Figure 15 is prior art rotor position protection logic chart.
Figure 16 is rotor position protection logic chart of the present invention.
In figure, HP: high pressure cylinder；IP: intermediate pressure cylinder；LP: low pressure (LP) cylinder；G: generator；LC: exciter.
Specific embodiment
In the following with reference to the drawings and specific embodiments, a specific embodiment of the invention is further described.
Embodiment
As shown in Fig. 2, a kind of T Steam Turbine SI measuring device, including pass through the sequentially connected exciter 1 of jackshaft 9, power generation
Machine 2, thrust bearing working face 3, low pressure (LP) cylinder 4, intermediate pressure cylinder 5, high pressure cylinder 6, front bearing box 7, jackshaft 9 are supported by bearing 8, front axle
It holds and is equipped with fore bearing axis measuring surface 701 in case 7, differential expansion probe is mounted on 3 side of thrust bearing working face, axial displacement probe peace
Mounted in 701 side of fore bearing axis measuring surface, vibration probe is mounted on 8 side of bearing；The various probes in succession with sensor, preceding
Set device, measurement fastener, DCS system, the connection of ETS system, differential expansion, axial displacement, vibration crisis signal pass through export back respectively
Road passes to relay.
T Steam Turbine SI device includes differential expansion protective device, axial displacement limiting device and bear vibration protective device, difference
Steam turbine differential expansion, axial displacement, bear vibration are monitored, when output signal exception, are sent to DCS system record data simultaneously
Alarm is sent to ETS system and carries out chaser protection and data are sent into DCS system record data when output signal danger.
As shown in figure 3, being seen from front bearing box 7 to 2 direction of generator, 45 ° of right side side in T Steam Turbine SI measuring device
To for X-direction, 45 ° of left side direction is Y-direction, and the X hereinafter related to, Y-direction are applicable in this definition.
In steam turbine differential expansion detection, differential expansion Δ E range is -5mm≤Δ E≤20mm, i.e., differential expansion Δ E range is 25mm.When
Vibration occurs for big shaft position, and when leaving thrust bearing working face, differential expansion detection value is set as positive value display；When thrust bearing works
Face is worn, and when axial direction working face direction is mobile greatly, measured value is shown as negative value at this time, is determined to balance the protection on positive and negative both sides
Value set differential expansion variation zero-bit as at Δ E=5mm；As -2mm≤Δ E≤15mm, differential expansion Δ E range zero Δ E=5mm compared with
Closely, this section of region is defined as differential expansion area, i.e. I value；As -5mm≤Δ E < -2mm and 15mm < Δ E≤20mm, differential expansion
Farther out, this section of region is defined as differential expansion danger area, i.e. II value to Δ E range zero Δ E=5mm.
As shown in Fig. 2, Fig. 5 and Fig. 8, vertically set close to 7 side of front bearing box there are two differential expansion in thrust bearing working face 3
Probe is the first differential expansion probe DE1 of X-direction, the second differential expansion probe DE2 of Y-direction respectively.Differential expansion probe is Bentley 50mm
Eddy current probe, probe length 49.5mm, in conjunction with Fig. 6 it is found that the spacing between thrust bearing working face 3 and wheel hub 10 is 95mm,
Calculate it is found that Bentley 50mm eddy current probe measurable range be 95mm-49.5mm=45.5mm, meet differential expansion Δ E=
The range requirement of 25mm.
As shown in Figure 10, the first differential expansion probe DE1 or the signal of the second differential expansion probe DE2 monitoring, either signal value are greater than
When abnormal signal I value, signal is transmitted to DCS system record data and alarms, and is not transferred to ETS system at this time and carries out chaser guarantor
Shield reduces service personnel's workload and reduces chaser number, guarantees steam turbine continuous work.When the first differential expansion probe DE1 and
Second differential expansion pop one's head in DE2, one of signal value be greater than abnormal signal I value, and another be greater than danger signal II value when, explanation
Both there is abnormal signal in thrust bearing working face 3, danger signal also occurs, judges that differential expansion occurs in steam turbine with this, credible
Du Genggao, at this point, crisis signal is transmitted to ETS system, system carries out chaser protection and alarms, in the entire operation of steam turbine
A possibility that Cheng Zhong, false tripping chance error operates, substantially reduces.
Turbine shaft is into displacement measurement, the axial displacement -1.1mm < Δ L < 0.8mm of permission, as axial displacement L
When≤- 1.1mm or Δ L >=0.8mm, this range is the dangerous values III value of axial displacement.
As shown in figs. 2 and 11, it is equipped in fore bearing axis measuring surface 701 close to 7 side of front bearing box and is surveyed with fore bearing axis
Two parallel fasteners of amount face 701, are the fastener 7X of X-direction, the fastener 7Y of Y-direction respectively.Fastener 7X is fixed, and there are two each other
Independent third axial displacement probe ZY3 and the 4th axial displacement probe ZY4；It is fixed on fastener 7Y that there are two independent of each other the
One axial displacement probe ZY1 and the second axial displacement probe ZY2, first axis displacement probe ZY1, the second axial displacement probe
ZY2, third axial displacement probe ZY3 and the 4th axial displacement probe ZY4 are perpendicular to fore bearing axis measuring surface 701.
As shown in figure 13, when any axial displacement of any axial displacement probe of X-direction and Y-direction is popped one's head in while being monitored
When to dangerous values III value, judges that danger signal occurs in fore bearing axis measuring surface 701 with this, reduce due to fastener 7X or fastener 7Y
The probability that itself breaks down, at this point, crisis signal is transmitted to ETS system, system carries out chaser protection and alarms, in steam turbine
In entire operational process, the protection of false tripping machine or the probe event of a certain axial displacement occurred due to fastener faults itself is avoided
Barrier occurs refusing chaser protection, reduces equipment damage probability, improves the accuracy of axial displacement measurement.
In steam turbine bearing vibration measurement, bear vibration amplitude Δ V, exceptional value IV value refers to Δ V=0.127mm；Dangerous values V
Value: when Relative Vibration, Δ V=0.254mm；When absolute vibration, Δ V=0.30mm.
As shown in Figures 2 and 3, it is visited in the first Relative Vibration that bearing 8 is respectively equipped with X-direction far from the two sides of central axis 9
Head BVX, the second Relative Vibration probe B VY of Y-direction and the absolute vibration probe B V of Y-direction, three bear vibration probe verticals
In central axis 9.
As shown in figure 16, when the first Relative Vibration probe B VX of X-direction reaches exceptional value IV value, the second of Y-direction is opposite
It is any in vibration probe BVY and absolute vibration probe B V to judge that danger signal occurs in bearing with this when reaching dangerous values V value, this
When, crisis signal is transmitted to ETS system, and system carries out chaser protection and alarms, and in the entire operational process of steam turbine, drops
Abnormal signal caused by the low variation as external reference point promotes vapour so that the probability of false tripping machine, reduces shutdown inspection number
Turbine working efficiency.
It obviously, is not limitation of the invention although the present invention is disclosed with above-described embodiment.Any this field it is general
Logical technical staff without departing from the spirit and scope of the present invention, can make possible variation on the basis of the above description
And modification.Therefore, protection scope of the present invention should be subject to the range that claims of the present invention is defined.
Claims (9)
1. a kind of T Steam Turbine SI measuring device, which is characterized in that including by jackshaft (9) sequentially connected exciter (1),
Generator (2), thrust bearing working face (3), low pressure (LP) cylinder (4), intermediate pressure cylinder (5), high pressure cylinder (6), front bearing box (7), in centre
Axis (9) is if be equipped with dry bearing (8), and front bearing box (7) is inner to be equipped with fore bearing axis measuring surface (701), in thrust bearing working face
(3) side is popped one's head in equipped with differential expansion, and axial displacement probe is mounted on fore bearing axis measuring surface (701) side, vibration probe installation
On the upside of bearing (8).
2. a kind of T Steam Turbine SI measuring device according to claim 1, which is characterized in that see from front bearing box (7) to hair
Motor (2) direction, 45 ° of right side of definition direction are X-direction, and 45 ° of left side direction is Y-direction；
It is equipped with the first differential expansion probe (DE1) in the X-direction of thrust bearing working face (3), Y-direction is popped one's head in equipped with the second differential expansion
(DE2), and the first differential expansion is popped one's head in (DE1), the detection direction of the second differential expansion probe (DE2) is perpendicular to thrust bearing working face (3).
3. a kind of T Steam Turbine SI measuring device according to claim 1, which is characterized in that see from front bearing box (7) to hair
Motor (2) direction, 45 ° of right side of definition direction are X-direction, and 45 ° of left side direction is Y-direction；
The fore bearing axis measuring surface (701) is equipped with the X-direction fastener (7X) parallel with fore bearing axis measuring surface (701) and the side Y
To fastener (7Y)；
X-direction fastener (7X) is fixed with third axial displacement probe (ZY3) and the 4th axial displacement probe (ZY4)；
First axis displacement probe (ZY1) and the second axial displacement probe (ZY2) are fixed on Y-direction fastener (7Y)；
First axis displacement probe (ZY1), the second axial displacement probe (ZY2), third axial displacement probe (ZY3) and the 4th axis
To displacement probe (ZY4) detection direction perpendicular to fore bearing axis measuring surface (701).
4. a kind of T Steam Turbine SI measuring device according to claim 1, which is characterized in that see from front bearing box (7) to hair
Motor (2) direction, 45 ° of right side of definition direction are X-direction, and 45 ° of left side direction is Y-direction；
There are three the vibration probes, and respectively the first Relative Vibration of X-direction is popped one's head in (BVX), the second Relative Vibration of Y-direction
It pops one's head in (BVY) and the absolute vibration of Y-direction is popped one's head in (BV), and three vibration probes are axially vertical with jackshaft (9).
5. a kind of measurement method of T Steam Turbine SI measuring device according to any one of claims 1 to 4, which is characterized in that
See that, to generator (2) direction, 45 ° of right side of definition direction is X-direction, and 45 ° of left side direction is Y-direction from front bearing box (7)；
The measurement method includes differential expansion protection method, rotor position protection measurement method, bear vibration protection side
Method；
The exceptional value range for defining steam turbine differential expansion Δ E is I value, and dangerous values range is II value；
Definition steam turbine axial displacement L dangerous values range is III value；
The bear vibration amplitude Δ V critical value of steam turbine X-direction is set as IV value, the bear vibration amplitude Δ V critical value of Y-direction
For V value；
The protection process of differential expansion protection method is as follows:
S11: when electric side differential expansion is in range I value；Or
In range I value, DCS system record data are simultaneously alarmed for furnace side differential expansion；
S12: when electric side differential expansion is in range I value, and furnace side differential expansion is in range II value；Or
Furnace side differential expansion is in range I value, and electric side differential expansion, in range II value, ETS system chaser is protected and alarmed；
The displacement that first axis displacement probe (ZY1) is measured is defined as first axis displacement；Second axial displacement probe (ZY2) is surveyed
The displacement obtained is the second axial displacement；The displacement that third axial displacement probe (ZY3) measures is third axial displacement；4th is axial
The displacement that displacement probe (ZY4) measures is the 4th axial displacement；
The protection process of rotor position protection measurement method is as follows:
S21: when third axial displacement and first axis displacement are simultaneously in range III value；Or
Third axial displacement and the second axial displacement are simultaneously in range III value；Or
4th axial displacement and first axis displacement are simultaneously in range III value；Or
Simultaneously in range III value, ETS system chaser is protected and is alarmed for 4th axial displacement and the second axial displacement；
The protection process of bear vibration protection method is as follows:
S31: when bearing Y-direction absolute vibration be greater than V value, and X-direction Relative Vibration be greater than IV value；Or
Bearing Y-direction Relative Vibration be greater than V value, and X-direction Relative Vibration be greater than IV value when, ETS system chaser is protected and is alarmed.
6. a kind of measurement method of T Steam Turbine SI measuring device according to claim 5, which is characterized in that described first
Differential expansion pop one's head in (DE1) and the second differential expansion probe (DE2) be Bentley 50mm eddy current probe, differential expansion Δ E range for -5mm≤Δ E≤
20mm。
7. a kind of measurement method of T Steam Turbine SI measuring device according to claim 5, which is characterized in that differential expansion zero-bit
At Δ E=5mm；The exceptional value I value range of differential expansion are as follows: -2mm≤Δ E≤15mm；The dangerous values II value range of differential expansion are as follows: -5mm
≤ Δ E < -2mm and 15mm < Δ E≤20mm.
8. a kind of measurement method of T Steam Turbine SI measuring device according to claim 5, which is characterized in that the axis of permission
To displacement range are as follows: -1.1mm < Δ L < 0.8mm, as axial displacement L≤- 1.1mm or Δ L >=0.8mm, this range is
The dangerous values III value of axial displacement.
9. a kind of measurement method of T Steam Turbine SI measuring device according to claim 5, which is characterized in that bear vibration
In amplitude Δ V, IV value refers to Δ V=0.127mm；When Relative Vibration, V value refers to Δ V=0.254mm；When absolute vibration, V value refer to Δ V=
0.30mm。
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| CN107956518B (en) * | 2017-11-21 | 2019-12-24 | 阳江核电有限公司 | Nuclear turbine low-pressure rotor expansion amount accounting method |
| CN108412559A (en) * | 2018-03-07 | 2018-08-17 | 西安热工研究院有限公司 | A kind of calibration method of steam turbine monitoring system |
| CN108592966A (en) * | 2018-03-30 | 2018-09-28 | 中国能源建设集团安徽电力建设第工程有限公司 | A kind of thermal control device flow of installation |
| CN108917916A (en) * | 2018-07-25 | 2018-11-30 | 北京振测智控科技有限公司 | A kind of measurement method of shaft absolute vibration |
| CN109404066B (en) * | 2018-12-05 | 2021-12-17 | 华能国际电力股份有限公司大连电厂 | Monitoring and protecting TSI (transient service interface) system of steam turbine generator unit and innovation optimization method thereof |
| CN109764787A (en) * | 2019-03-13 | 2019-05-17 | 莱芜钢铁集团有限公司 | A kind of steam turbine generator unit differential expansion fault point detecting method |
| CN110374802A (en) * | 2019-06-04 | 2019-10-25 | 华电电力科学研究院有限公司 | A kind of Wind turbines ETS protective device and logic design method |
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| CN201589683U (en) * | 2009-12-14 | 2010-09-22 | 贵州电力试验研究院 | Differential expansion monitoring device of turbine lower-pressure cylinder |
| CN102213116B (en) * | 2011-05-06 | 2015-02-11 | 上海发电设备成套设计研究院 | Device and method for monitoring and controlling security risk of turbine bearing in on-line manner |
| CN202599326U (en) * | 2012-04-05 | 2012-12-12 | 黑龙江龙煤矿业集团股份有限公司双鸭山分公司虹焱热电有限公司 | Axial displacement monitor protective device of front small shaft of steam turbine |
| CN205503198U (en) * | 2015-12-09 | 2016-08-24 | 大唐黄岛发电有限责任公司 | TSI system for steam turbine |
| CN106523041B (en) * | 2016-10-12 | 2018-01-02 | 国网上海市电力公司 | A kind of steam turbine differential expansion Protection control system |
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