CN112611524A - Method for improving cooling effect of generator outgoing line sleeve - Google Patents
Method for improving cooling effect of generator outgoing line sleeve Download PDFInfo
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- CN112611524A CN112611524A CN202011312981.5A CN202011312981A CN112611524A CN 112611524 A CN112611524 A CN 112611524A CN 202011312981 A CN202011312981 A CN 202011312981A CN 112611524 A CN112611524 A CN 112611524A
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- 238000001816 cooling Methods 0.000 title claims abstract description 29
- 230000000694 effects Effects 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 19
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000001257 hydrogen Substances 0.000 claims abstract description 42
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 42
- 239000011521 glass Substances 0.000 claims abstract description 28
- 239000010445 mica Substances 0.000 claims abstract description 28
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 28
- 229920006332 epoxy adhesive Polymers 0.000 claims abstract description 25
- 239000011248 coating agent Substances 0.000 claims abstract description 8
- 238000000576 coating method Methods 0.000 claims abstract description 8
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 230000001680 brushing effect Effects 0.000 claims abstract description 4
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- 229910052736 halogen Inorganic materials 0.000 claims description 3
- 125000005843 halogen group Chemical group 0.000 claims description 2
- 230000009467 reduction Effects 0.000 abstract description 7
- 238000007599 discharging Methods 0.000 abstract description 2
- 238000010248 power generation Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 239000000112 cooling gas Substances 0.000 description 4
- 238000011835 investigation Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 241000282414 Homo sapiens Species 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
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- 230000032683 aging Effects 0.000 description 1
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- 150000002367 halogens Chemical class 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
Abstract
The invention relates to a method for improving the cooling effect of a generator outlet sleeve, which comprises the following steps: calculating the hydrogen leakage amount in the generator, and if the leakage amount exceeds a safety threshold, checking the air tightness of the end part of the outlet sleeve; if the air tightness is not qualified, the outlet sleeve is processed; replacing hydrogen in the outgoing line sleeve with air, discharging the pressure to the standard atmospheric pressure, and cleaning the outgoing line sleeve; coating the end part of the outgoing line sleeve by using a glass mica ribbon, brushing an epoxy adhesive on the glass mica ribbon, and allowing the epoxy adhesive to penetrate into a gap between the glass mica ribbon and the outgoing line sleeve and to be cured; if the air tightness of the end part of the outlet sleeve is qualified, the generator works again. Compared with the prior art, the invention combines the glass mica ribbon and the epoxy adhesive, improves the air tightness of the outgoing line sleeve, solves the problems of hydrogen leakage caused by poor air tightness of the outgoing line sleeve and reduction of cooling effect caused by hydrogen leakage, effectively improves the generating efficiency of the generator, and has simple operation and low cost.
Description
Technical Field
The invention relates to the technical field of generator sets, in particular to a method for improving the cooling effect of a generator outlet sleeve.
Background
Since the discovery of electric energy, the life of human beings is greatly improved by electric energy, and along with the rapid development of world economy, the dependence and the demand of human beings on electric energy are increased. The generator is the most important equipment in a power plant, converts other energy into electric energy, and how to guarantee and improve the generating efficiency of the generator is a hotspot of research.
There are many factors that affect the power generation efficiency of the generator. The total power generation amount increases after the generator No. 3 of this plant is put into use, but the power generation efficiency of the generator gradually decreases as the service time of the generator increases. Through investigation, factors causing the reduction of the generating efficiency of the generator are still existed except the reduction of the generating efficiency of the generator caused by the service life problem of the components. After the investigation is carried out again, the cooling effect of the outgoing line sleeve of the No. 3 generator A-phase generator is found to be reduced, so that the generating efficiency of the generator is reduced.
The outgoing line sleeve is a channel for outputting the electric quantity of the generator, the current of the stator of the generator is led out of the generator from the inside of the generator, and hydrogen with good cooling effect is adopted as a cooling medium in the outgoing line sleeve. When the generator operates, the outgoing line sleeve will flow thousands of amperes of current, the passing of heavy current produces considerable heat, if the cooling effect of the outgoing line sleeve drops, so that the heat is too much, and the generating efficiency of the generator will drop.
Disclosure of Invention
The inventor analyzes and studies that it is found that the cooling effect of the wire jacket is not good, mainly due to the reduction of hydrogen gas for cooling. In practical use, the pressure of hydrogen inside the generator outlet sleeve is generally 0.4Mpa, the hydrogen molecules are small, and if the outlet sleeve is not sealed well, the hydrogen easily overflows from the end part of the outlet sleeve to influence the cooling effect. The end position of the wire outlet sleeve is a gap between the insulating sleeve, the tubular conductor and the end fixing cover which are sealed by the rubber gasket, and after the wire outlet sleeve is used for a period of time, the gap is not tightly sealed due to the influences of service life aging, expansion with heat, contraction with cold and the like, hydrogen leaks, and the cooling effect is reduced. The invention aims to provide a method for improving the cooling effect of the outgoing line sleeve of the generator, which improves the air tightness of the outgoing line sleeve of the generator by combining a glass mica ribbon and an epoxy adhesive, solves the problems of hydrogen leakage caused by poor air tightness of the outgoing line sleeve and reduction of the cooling effect caused by the hydrogen leakage, effectively improves the power generation efficiency of the generator, and has simple operation and extremely low cost.
The purpose of the invention can be realized by the following technical scheme:
a method for improving the cooling effect of an outgoing line sleeve of a generator comprises the following steps:
s1: obtaining a change value of the internal pressure of the generator within a preset time length, calculating the hydrogen leakage amount inside the generator according to the change value, if the hydrogen leakage amount does not exceed a preset safety threshold, continuing the operation of the generator, otherwise, checking whether the air tightness of the end part of the outlet sleeve is qualified;
s2: if the air tightness of the end part of the outgoing line sleeve is unqualified, executing step S3, otherwise, checking whether the air tightness of other parts of the generator is qualified, processing the other parts of the generator, and executing step S6;
s3: the generator stops working, hydrogen in the wire outlet sleeve is replaced by air, the pressure is released to the standard atmospheric pressure, the wire outlet sleeve is cleaned by cleaning cloth, and a gap is cleaned by absolute ethyl alcohol, wherein the gap is a gap between the insulating sleeve, the tubular conductor and the end fixing cover;
s4: coating the end part of the outgoing line sleeve by using a glass mica ribbon, brushing an epoxy adhesive on the glass mica ribbon, and allowing the epoxy adhesive to penetrate into a gap between the glass mica ribbon and the outgoing line sleeve and to be cured;
s5: checking whether the air tightness of the end part of the outlet sleeve is qualified, if so, executing the step S6, otherwise, executing the step S4;
s6: filling hydrogen into the generator, raising the pressure value inside the generator to the working pressure value inside the generator, and repeating the step S1.
Further, in the step S1, the preset time duration is 24 hours.
Further, in the step S1, the preset safety threshold is 14m3。
Further, in step S4, the glass mica ribbon has a width of 25mm and a thickness of 0.1mm, and is wrapped two to three times around the end of the outlet sleeve.
Further, in the step S4, the coating position of the glass mica tape is a connecting position of the insulating sleeve and the end fixing cover.
Further, in step S4, the epoxy adhesive is a room temperature cured epoxy adhesive.
Further, in step S5, the step of checking the airtightness of the end of the outlet sleeve includes the following steps:
s51: filling detection gas into the outlet sleeve;
s52: raising the pressure in the outlet sleeve to a preset detection threshold;
s53: detecting whether the end part of the wire sleeve has leaked detection gas by using a gas detector;
s54: if the detection gas is not detected, the airtightness is qualified, and step S6 is executed, otherwise, step S4 is executed.
Further, in step S51, the detection gas is air containing freon, and the content of freon is 6%.
Further, in step S52, the preset detection threshold is 0.5 MPa.
Further, in step S53, the gas detector is a halogen gas detector.
Compared with the prior art, the invention has the following beneficial effects:
(1) through the combination use of glass mica ribbon and epoxy adhesive, promoted generator outlet sleeve's gas tightness, solved because of the poor hydrogen that leads to of outlet sleeve gas tightness leaks and because of the cooling effect decline problem that hydrogen leaked and cause, effectively improved the generating efficiency of generator, easy operation.
(2) Only need to go on to the outlet sleeve pipe handle with the gas tightness detect can, need not change the outlet sleeve pipe, reduced cost consumption, and do not need professional to carry out complicated operation and the test of changing behind the outlet sleeve pipe, the maintenance cycle is short.
(3) When the air tightness of the outlet sleeve is improved to ensure the cooling effect, the explosion danger possibly caused by hydrogen leakage is also avoided, and the safety is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of the wire outlet sleeve in the embodiment;
reference numerals: 1. the terminal joint of the outgoing line sleeve, 2, a rubber gasket, 3, a mounting flange, 4, an insulating sleeve, 5, a tubular electric conductor, 6, a generator side connecting flange, 7, a cooling gas inlet, 8, a cooling gas outlet, 9, a vent hole, 10 and a terminal fixing cover.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1:
the total power generation amount increases after the generator No. 3 of this plant is put into use, but the power generation efficiency of the generator gradually decreases as the service time of the generator increases. Through investigation, factors causing the reduction of the generating efficiency of the generator are still existed except the reduction of the generating efficiency of the generator caused by the service life problem of the components. After the investigation is carried out again, the cooling effect of the outgoing line sleeve of the No. 3 generator A-phase generator is found to be reduced, so that the generating efficiency of the generator is reduced.
As shown in fig. 2, the outlet bushing includes an outlet bushing end fitting 1, a rubber gasket 2, a mounting flange 3, an insulating sleeve 4, a tubular conductor 5, a generator-side connecting flange 6, and an end fixing cover 10. The generator outlet sleeve is fixed on the generator by a mounting flange 3, the upper part of the generator outlet sleeve is connected with a 21KV phase-separated enclosed bus by an outlet sleeve end connector 1, a tubular conductor 5 is arranged in the outlet sleeve, and the outer side of the outlet sleeve is protected by an insulating sleeve 4 and is electrically isolated. The tubular conductor 5 is connected with a generator stator winding through a generator side connecting flange 6, hydrogen is cooled inside the tubular conductor 5, the pressure of the hydrogen is maintained at 0.42MPa, the hydrogen enters from a cooling gas inlet 7, flows into a cavity between the tubular conductor 5 and the insulating sleeve 4 through a vent hole 9, and flows back into the generator from a cooling gas outlet 8.
The research shows that when the generator is running, 8000A of current can pass through the tubular conductor 5, the temperature of the end part of the outlet sleeve is basically maintained between 60 and 70 ℃, and when the generator is stopped, the temperature of the end part is reduced to the room temperature. Because the gas turbine power plant as a peak shaving unit needs to be stopped at night and open day, the cold and heat exchange at the end part of the generator outlet sleeve in the plant is frequent, the rubber gasket 2 is aged at an accelerated speed, the sealing performance cannot be ensured, and hydrogen leaks from the end part of the generator outlet sleeve, so that the cooling effect of the outlet sleeve is reduced, and the power generation efficiency is influenced.
Because the outlet sleeve adopts the integrated forming technology, once the outlet sleeve has problems, the whole outlet sleeve can only be replaced, the cost is very high, the cost of a domestic sleeve is in tens of thousands yuan, and the cost of an imported sleeve is in tens of thousands yuan and is expensive. The operation is complicated when the outgoing line sleeve is replaced, the connection between the outgoing line sleeve and the generator needs to be detected after replacement, electrical tests such as an air tightness test, a monomer alternating current withstand voltage test, a monomer insulation test and the like are carried out, a generator stator winding direct current resistance, a hand-wrapped insulation potential outward movement test, a direct current leakage current test and the like are carried out, the generator seal nut is removed, the replacement of the outgoing line sleeve of the generator is carried out again to the recovery of relevant equipment, the maintenance period is at least 20 days before and after the replacement, and the maintenance period is long.
Therefore, a low-cost, fast method is needed to improve the cooling effect of the outgoing line bushing.
A method for improving the cooling effect of an outgoing line sleeve of a generator, as shown in fig. 1, comprises the following steps:
s1: obtaining a change value of the internal pressure of the generator within a preset time length, calculating the hydrogen leakage amount inside the generator according to the change value, if the hydrogen leakage amount does not exceed a preset safety threshold, continuing the operation of the generator, otherwise, checking whether the air tightness of the end part of the outlet sleeve is qualified;
s2: if the air tightness of the end part of the outgoing line sleeve is unqualified, executing step S3, otherwise, checking whether the air tightness of other parts of the generator is qualified, processing the other parts of the generator, and executing step S6;
s3: the generator stops working, hydrogen in the wire outlet sleeve is replaced by air, the pressure is released to the standard atmospheric pressure, the wire outlet sleeve is cleaned by cleaning cloth, and a gap is cleaned by absolute ethyl alcohol, wherein the gap is a gap between the insulating sleeve, the tubular conductor and the end fixing cover;
s4: coating the end part of the outgoing line sleeve by using a glass mica ribbon, brushing an epoxy adhesive on the glass mica ribbon, and allowing the epoxy adhesive to penetrate into a gap between the glass mica ribbon and the outgoing line sleeve and to be cured;
s5: checking whether the air tightness of the end part of the outlet sleeve is qualified, if so, executing the step S6, otherwise, executing the step S4;
s6: filling hydrogen into the generator, raising the pressure value inside the generator to the working pressure value inside the generator, and repeating the step S1.
In this embodiment, the change in the internal pressure of the generator is detected, and it is found that the hydrogen leakage amount is relatively high, and the hydrogen leakage amount is about 20m per day3Greater than the design value of the manufacturer by 14m3And detecting the end part of the wire sleeve, and finding that the end part has a hydrogen leakage phenomenon, wherein the hydrogen leakage probe detects that the content of hydrogen in the air is about 0.6%.
And stopping the generator, exhausting hydrogen in the outlet sleeve and discharging the pressure in the outlet sleeve to the standard atmospheric pressure. The end part of the generator outlet sleeve is checked by using a gas leakage detection spray, no bubble is generated to prove that the internal pressure is decompressed, and the subsequent work is not influenced.
Cleaning the outgoing line sleeve by using a cleaning cloth to remove dust, and cleaning gaps between the insulating sleeve 4, the tubular conductor 5 and the end fixing cover 10 by using absolute ethyl alcohol to remove stains and impurities. The end of the outlet sleeve is wrapped with two to three turns using glass mica ribbon with width of 25mm and thickness of 0.1mm, the wrapping position is the connecting position of the insulating sleeve 4 and the end fixing cover 10, as shown in fig. 2. And (4) tightening the coated glass mica silk ribbon, knotting and fixing, and cutting off the redundant part by using scissors.
And (3) coating an epoxy adhesive on the glass mica ribbon, and allowing the epoxy adhesive to penetrate into a gap between the glass mica ribbon and the outlet sleeve and be cured. In this embodiment, the epoxy adhesive used is a room temperature-curable epoxy adhesive, and is used in combination with a glass mica tape because the adhesion effect is not good when the epoxy adhesive is directly applied. After the epoxy adhesive is coated on the glass mica ribbon, the liquid epoxy adhesive has good permeability for the glass mica filaments, so the epoxy adhesive can penetrate to a leakage point, completely solidify after standing for 24 hours at normal temperature, the solidified epoxy adhesive and the outlet sleeve become a whole, the gaps among the insulating sleeve 4, the tubular conductor 5 and the end fixing cover 10 are completely sealed, and hydrogen is effectively prevented from leaking.
And after the operation is finished, checking the air tightness of the end part of the outlet sleeve, and if the air tightness is unqualified, continuously coating epoxy adhesive on the glass mica ribbon until the air tightness is qualified.
The checking of the airtightness comprises the following steps:
s51: filling detection gas into the outlet sleeve;
s52: raising the pressure in the outlet sleeve to a preset detection threshold;
s53: detecting whether the end part of the wire sleeve has leaked detection gas by using a gas detector;
s54: if the detection gas is not detected, the airtightness is qualified, and step S6 is executed, otherwise, step S4 is executed.
The detection gas is air containing Freon, and the content of Freon is 6%. Specifically, in this embodiment, Freon is filled in the air inside the generator as the detection gas, and the minimum usage amount is 0.07kg/m3The generator volume of the factory is 105m3Therefore, 7.35kg is filled, the internal pressure of the generator is increased to 0.5MPa, and the end part of the generator outlet sleeve is subjected to gas detection by a halogen gas detector.
In other embodiments, detection may be performed using a detection gas such as helium. In addition, the air tightness can also be judged by directly detecting the end part of the outlet sleeve by using a gas leakage detection spray and the like.
After the gas detection is qualified, hydrogen is filled into the generator, the pressure value inside the generator is increased to the working pressure value inside the generator to be 0.42Mpa, the hydrogen leakage rate inside the generator in 24 hours is calculated, and if the hydrogen leakage rate is still larger than that of a manufacturerDesign value 14m3And then, other parts of the generator are continuously detected and processed.
In this embodiment, after the above processing, the result of the hydrogen leakage amount is: hydrogen leakage 4.8m in 24 hours3Which is already an excellent standard, the generator is put back into operation.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A method for improving the cooling effect of an outgoing line sleeve of a generator is characterized by comprising the following steps:
s1: obtaining a change value of the internal pressure of the generator within a preset time length, calculating the hydrogen leakage amount inside the generator according to the change value, if the hydrogen leakage amount does not exceed a preset safety threshold, continuing the operation of the generator, otherwise, checking whether the air tightness of the end part of the outlet sleeve is qualified;
s2: if the air tightness of the end part of the outgoing line sleeve is unqualified, executing step S3, otherwise, checking whether the air tightness of other parts of the generator is qualified, processing the other parts of the generator, and executing step S6;
s3: the generator stops working, hydrogen in the wire outlet sleeve is replaced by air, the pressure is released to the standard atmospheric pressure, the wire outlet sleeve is cleaned by cleaning cloth, and a gap is cleaned by absolute ethyl alcohol, wherein the gap is a gap between the insulating sleeve, the tubular conductor and the end fixing cover;
s4: coating the end part of the outgoing line sleeve by using a glass mica ribbon, brushing an epoxy adhesive on the glass mica ribbon, and allowing the epoxy adhesive to penetrate into a gap between the glass mica ribbon and the outgoing line sleeve and to be cured;
s5: checking whether the air tightness of the end part of the outlet sleeve is qualified, if so, executing the step S6, otherwise, executing the step S4;
s6: filling hydrogen into the generator, raising the pressure value inside the generator to the working pressure value inside the generator, and repeating the step S1.
2. The method for improving the cooling effect of the generator outgoing line bushing according to claim 1, wherein the preset time period in step S1 is 24 hours.
3. The method for improving the cooling effect of the outgoing line bushing of the generator as claimed in claim 1, wherein in step S1, the preset safety threshold is 14m3。
4. The method for improving the cooling effect of the outgoing bushing of the generator as claimed in claim 1, wherein in step S4, the width of the glass mica ribbon is 25mm and the thickness is 0.1mm, and the glass mica ribbon is wrapped at the end of the outgoing bushing for two to three turns.
5. The method for improving the cooling effect of the generator outgoing line sleeve according to claim 4, wherein in the step S4, the coating position of the glass mica tape is the connecting position of the insulating sleeve and the end fixing cover.
6. The method for improving the cooling effect of the generator outgoing line bushing as claimed in claim 1, wherein in the step S4, the epoxy adhesive is a room temperature curing epoxy adhesive.
7. The method for improving the cooling effect of the generator outgoing line bushing of claim 1, wherein the step S5 of checking the airtightness of the end of the outgoing line bushing comprises the following steps:
s51: filling detection gas into the outlet sleeve;
s52: raising the pressure in the outlet sleeve to a preset detection threshold;
s53: detecting whether the end part of the wire sleeve has leaked detection gas by using a gas detector;
s54: if the detection gas is not detected, the airtightness is qualified, and step S6 is executed, otherwise, step S4 is executed.
8. The method of claim 7, wherein in step S51, the detected gas is air containing freon, and the content of freon is 6%.
9. The method for improving the cooling effect of the outgoing line bushing of the generator as claimed in claim 8, wherein in step S52, the preset detection threshold is 0.5 MPa.
10. The method of claim 8, wherein in step S53, the gas detector is a halogen gas detector.
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| CN202011312981.5A CN112611524A (en) | 2020-11-20 | 2020-11-20 | Method for improving cooling effect of generator outgoing line sleeve |
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