CN105258737B - A kind of industrial area electric power line pole tower Forecast of Remaining Life of Corrosive - Google Patents
A kind of industrial area electric power line pole tower Forecast of Remaining Life of Corrosive Download PDFInfo
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Abstract
The invention discloses a kind of industrial area electric power line pole tower Forecast of Remaining Life of Corrosive, step includes：1) measurement is predicted the remaining zinc coat average thickness of tower material of shaft tower；2) measurement is predicted the least residue thickness in the tower material seriously corroded region of shaft tower, and the tower material original thickness for being predicted shaft tower is subtracted into the tower material maximum corrosion depth that the least residue thickness obtains being predicted shaft tower；3) determination is predicted the iron rot speed and zine corrosion speed of industrial area residing for shaft tower；4) the maximum allowable corrosion depth of tower material for being predicted industrial area residing for shaft tower is obtained；5) the remaining safe life of corrosion for being predicted shaft tower is calculated.The present invention can rapidly and accurately predict corrosion residual life of the electric power line pole tower in industrial area, to take repair and maintenance measure in time, the accident such as prevent the transmission line of electricity that thus triggers go offline, have a power failure, tripping, has the advantages that the scientific and reasonable, time is quick, accuracy rate is high.
Description
Technical field
The present invention relates to power engineering field, and in particular to a kind of industrial area electric power line pole tower corrosion residual life prediction
Method.
Background technology
In power system, high pressure overhead power line is mainly made up of shaft tower, wire and gold utensil.Wherein shaft tower is power transmission line
The structural support person on road, plays a part of fixed with supporting wire and gold utensil, preventing transmission line of electricity from contacting ground.It is used as power transmission line
The major bearing structures on road, the consumption of shaft tower is very huge, only just there is shaft tower bases up to a million in Hunan Province, per base shaft tower weight number
Ton, to tens of tons, is a base part of consumption maximum in transmission line of electricity.With the high speed development of modern power network, extra-high voltage, intelligence
The construction of power network, the consumption of shaft tower is also constantly expanding.Because transmission line of electricity is distributed in open field, wind and frost sleet is subjected to for a long time
Invasion and attack, can generally occur etching problem in pole tower operation.Shaft tower corrosion failure will cause wire and gold utensil directly to fall ground,
Cause line tripping, power failure, even personal safety accident is caused when serious.Therefore shaft tower is most important safely.
Current power transmission overhead line structures use ferrous materials to make substantially, and surface uses galvanizing by dipping anti-corrosion, is typically designed the longevity
Life more than 30 years.But general operation just engenders obvious corrosion in more than 10 years in natural environment, especially in industrial pollution area,
Acid rain formation deep-etching destruction, red rust may be covered comprehensively, shaft tower rust is worn, disconnected accident of becoming rusty happens occasionally, actual in the several years
Life-span is not by far up to the mark.But qualitative assessment predicting means is lacked to the shaft tower after corrosion at present, it is impossible to whether determine shaft tower
Safety, can not determine shaft tower can continue the residual life of safe operation for how long, the life-span is only pondered by personal experience, more
Arbitrarily and blindly.And the repair and maintenance of shaft tower is a heavy construction, it is necessary to lay a course in advance, to apply for the scheduling that has a power failure.Cause
This is particularly significant to the remaining safe life prediction after shaft tower corrosion, it is desirable to have a kind of quantization means are analysed scientifically, can
Repair schedule is arranged to carry out Corrosion Maintenance or directly changed when serious in time before the generation of corrosion accident, it is to avoid shaft tower corrosion is not
Safe condition, it is ensured that electric power netting safe running.Run unit is extremely urgent and necessary to this demand.
The content of the invention
The technical problem to be solved in the present invention：Lack quantitative corrosion residual life for current power transmission overhead line structures and assess hand
The backwardness situation of section can rapidly and accurately predict corrosion residual life of the electric power line pole tower in industrial area there is provided a kind of, with
Just take repair and maintenance measure in time, the accident such as prevent the transmission line of electricity thus triggered go offline, have a power failure, tripping, it is scientific and reasonable, when
Between the high industrial area electric power line pole tower Forecast of Remaining Life of Corrosive of quick, accuracy rate.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
A kind of industrial area electric power line pole tower Forecast of Remaining Life of Corrosive, step includes：
1) measurement is predicted the remaining zinc coat average thickness d of tower material of shaft towerZn；
2) measurement is predicted the least residue thickness t in the tower material seriously corroded region of shaft tower, will be predicted the tower material of shaft tower
Original thickness h subtracts the tower material maximum corrosion depth d that the least residue thickness t obtains being predicted shaft tower；
3) determination is predicted the iron rot speed v of industrial area residing for shaft towerFeWith zine corrosion speed vZn；
4) the maximum allowable corrosion depth d of tower material for being predicted industrial area residing for shaft tower is obtainedC；
5) function expression according to formula (1) calculates the remaining safe life of corrosion for being predicted shaft tower；
RL=1000 (dC-d)÷vFe+dZn÷vZn (1)
In formula (1), RL is the remaining safe life of corrosion for being predicted shaft tower, dCTo be predicted the tower of industrial area residing for shaft tower
The maximum allowable corrosion depth of material, d is the tower material maximum corrosion depth for being predicted shaft tower, dZnTo be predicted the tower material residue plating of shaft tower
Zinc layers average thickness, vFeTo be predicted the iron rot speed of industrial area residing for shaft tower, vZnTo be predicted industrial area residing for shaft tower
Zine corrosion speed.
Preferably, the step 1) detailed step include：The multiple measurement points being predicted on shaft tower are determined first, then
The remaining galvanized layer thickness of each measurement point on shaft tower is predicted by magnetic cladding thickness measurer measurement, and according to each measurement point
Remaining galvanized layer thickness calculate the remaining zinc coat average thickness of tower material for obtaining being predicted shaft tower.
Preferably, the step 2) the middle least residue thickness t for measuring the tower material seriously corroded region for being predicted shaft tower
Detailed step includes：The measuring surface being predicted on shaft tower is determined first, and polishing measuring surface removes floating rust, paint film or the oxidation on surface
Skin, is then not less than the residual thickness that 0.1mm size measurement instruments detect multiple positions in measuring surface by precision, and from many
Minimum value is taken in the residual thickness of individual position as the least residue thickness t in the tower material seriously corroded region for being predicted shaft tower.
Preferably, the step 4) detailed step include：
4.1) the Simulated Acid Rain solution for being predicted industrial area residing for shaft tower is prepared；
4.2) pre- crackle tensile sample is made in the tower material sample for being predicted shaft tower, by pre- crackle tensile sample by slowly should
Constant load tension test is carried out on variable Rate stress corrosion (cracking) test machine, and in the solution tank of slow-drawing stress corrosion test machine
It is middle to place the Simulated Acid Rain solution and Simulated Acid Rain solution is completely soaked the pre- crackle opening of pre- crackle tensile sample, measure
It is predicted tower material stress corrosion fracture toughness K of the shaft tower in residing industrial areaISCC；
4.3) based on the tower material design limit load σ for being predicted shaft towerC, stress corrosion fracture toughness KISCC, the original thickness of tower material
Degree h calculates the maximum allowable corrosion depth d of tower material for obtaining being predicted industrial area residing for shaft towerC。
Preferably, the step 4.1) detailed step include：Collect that to be predicted industrial area residing for shaft tower at least near first
Specify the Acid Rain pH Value in: Atmospheric of year and calculate pH value of acid rain annual mean x, take NaHSO3It is added to by amount in deionized water and configures simulation
Acid rain solution, the pH value of Simulated Acid Rain solution is configured with pH acidometer tracking measurements, makes pH value close to pH value of acid rain annual mean
x；When the pH value of Simulated Acid Rain solution is less than 0.03 with pH value of acid rain annual mean x difference, by the way that dilute H is added dropwise2SO4Solution or
NaOH solution is finely adjusted：If 1. Simulated Acid Rain solution ph higher than pH value of acid rain annual mean x and Simulated Acid Rain solution ph and
When pH value of acid rain annual mean x difference is less than 0.03, dilute H is added dropwise2SO4Solution makes the pH value of Simulated Acid Rain solution reduce more to become
PH value of acid rain annual mean x is bordering on, if 2. Simulated Acid Rain solution ph is slightly below pH value of acid rain annual mean x and Simulated Acid Rain solution
When pH value and pH value of acid rain annual mean x difference are less than 0.03, be added dropwise NaOH solution make the rise of Simulated Acid Rain solution ph with
More level off to pH value of acid rain annual mean x, finally make the pH value and pH value of acid rain annual mean x of Simulated Acid Rain solution complete by fine setting
Unanimously.
Preferably, the NaHSO3For SILVER REAGENT or the pure NaHSO of chemistry3。
Preferably, the step 4.3) in be predicted the maximum allowable corrosion depth d of tower material of industrial area residing for shaft towerCMeter
Calculate shown in function expression such as formula (2)；
In formula (2), σcTo be predicted the tower material design limit load of shaft tower, dcTo be predicted the tower of industrial area residing for shaft tower
The maximum allowable corrosion depth of material, h is the tower material original thickness for being predicted shaft tower, KISCCTo be predicted shaft tower in residing industrial area
Tower material stress corrosion fracture toughness.
Preferably, the step 3) detailed step include：It will distinguish with being predicted shaft tower material identical carbon steel and zinc
Dressing plate sample is made, dressing plate sample is individually placed to be predicted exposure 1 year under industrial area residing for shaft tower, carbon steel is detected
Thickness difference or corrosion weight loss before and after dressing plate specimen test, if detection be corrosion weight loss if corrosion weight loss is converted
Obtain the thickness difference before and after carbon steel dressing plate specimen test, by the thickness difference before and after carbon steel dressing plate specimen test divided by when
Between obtain being predicted the iron rot speed v of industrial area residing for shaft towerFe, detection zinc dressing plate specimen test before and after thickness difference or
Person's corrosion weight loss, if detection be corrosion weight loss if corrosion weight loss conversion is obtained into carbon steel dressing plate specimen test before and after
Thickness difference, the zinc for obtaining being predicted industrial area residing for shaft tower by the thickness difference before and after zinc dressing plate specimen test divided by time is rotten
Lose speed vZn。
Or preferably, the step 3) detailed step include：The corruption for being predicted industrial area residing for shaft tower is obtained first
Environment classification is lost, the default corrosive environment maximum corrosion rate table of comparisons is then inquired by classification according to corrosive environment, obtains pre-
The iron rot speed v of industrial area residing for measuring staff towerFeWith zine corrosion speed vZn。
Or preferably, the step 3) detailed step include：Directly calculated according to formula (3) first and be predicted shaft tower institute
Locate the iron rot speed v of industrial areaFe, then according to the iron rot speed v for being predicted industrial area residing for shaft towerFeSearch default
The corrosive environment maximum corrosion rate table of comparisons, obtains being predicted the zine corrosion speed v of industrial area residing for shaft towerZn；
vFe=1000 (h-t) ÷ T (3)
In formula (3), vFeTo be predicted the iron rot speed of industrial area residing for shaft tower, h be predicted shaft tower tower material it is original
Thickness, t is the least residue thickness in the tower material seriously corroded region for being predicted shaft tower, and T is to be predicted putting into operation the time for shaft tower.
Industrial area electric power line pole tower Forecast of Remaining Life of Corrosive tool of the present invention has the advantage that：Present invention measurement quilt
Predict the remaining zinc coat average thickness d of tower material of shaft towerZn, measure the least residue in the tower material seriously corroded region for being predicted shaft tower
Thickness t, the maximum corruption of tower material that least residue thickness t obtains being predicted shaft tower is subtracted by the tower material original thickness h for being predicted shaft tower
Depth d is lost, it is determined that being predicted the iron rot speed v of industrial area residing for shaft towerFeWith zine corrosion speed vZn, obtain and be predicted shaft tower
The maximum allowable corrosion depth d of tower material of residing industrial areaC, finally according to abovementioned steps result calculate be predicted shaft tower corrosion remain
Remaining safe life, has broken traditional restriction, is permitted with measurement surface Zinc Coating Thickness, least residue thickness, maximum corrosion rate, maximum
Perhaps corrosion depth, realizes the assessment to industrial area electric power line pole tower corrosion residual life, quickly, accurately, has ensured power network
Safety, can rapidly and accurately predict corrosion residual life of the electric power line pole tower in industrial area, to take maintenance to tie up in time
Shield measure, the accident such as prevent the transmission line of electricity that thus triggers go offline, have a power failure, trip is quick, accurately with the scientific and reasonable, time
The high advantage of rate.
Brief description of the drawings
Fig. 1 is the basic procedure schematic diagram of present invention method one.
Fig. 2 is the system structure diagram of progress constant load tension test in the embodiment of the present invention one.
Embodiment
Embodiment one：
As shown in figure 1, the step of the present embodiment industrial area electric power line pole tower Forecast of Remaining Life of Corrosive includes：
1) measurement is predicted the remaining zinc coat average thickness d of tower material of shaft towerZn；In the present embodiment, shaft tower surface has been covered
Red rust, therefore it is predicted the remaining zinc coat average thickness d of the tower material of shaft towerZn=0；
2) measurement is predicted the least residue thickness t in the tower material seriously corroded region of shaft tower, will be predicted the tower material of shaft tower
Original thickness h subtracts the tower material maximum corrosion depth d that least residue thickness t obtains being predicted shaft tower；In the present embodiment, it is predicted
The tower material original thickness h of shaft tower is 10mm, and least residue thickness t is 9mm, therefore tower material maximum corrosion depth d is 1mm；
3) determination is predicted the iron rot speed v of industrial area residing for shaft towerFeWith zine corrosion speed vZn；
4) the maximum allowable corrosion depth d of tower material for being predicted industrial area residing for shaft tower is obtainedC；
5) function expression according to formula (1) calculates the remaining safe life of corrosion for being predicted shaft tower；
RL=1000 (dC-d)÷vFe+dZn÷vZn (1)
In formula (1), RL is the remaining safe life of corrosion for being predicted shaft tower, dCTo be predicted the tower of industrial area residing for shaft tower
The maximum allowable corrosion depth of material, d is the tower material maximum corrosion depth for being predicted shaft tower, dZnTo be predicted the tower material residue plating of shaft tower
Zinc layers average thickness, vFeTo be predicted the iron rot speed of industrial area residing for shaft tower, vZnTo be predicted industrial area residing for shaft tower
Zine corrosion speed.
In the present embodiment, material used in shaft tower tower material is predicted for Q345 steel, measures for convenience, one is removed from shaft tower
The intact Q345 head tower materials of root, length 1m, follow-up measurement is to be completed based on the sampling.
In the present embodiment, step 1) detailed step include：The multiple measurement points being predicted on shaft tower are determined first, then
The remaining galvanized layer thickness of each measurement point on shaft tower is predicted by magnetic cladding thickness measurer measurement, and according to each measurement point
Remaining galvanized layer thickness calculate the remaining zinc coat average thickness of tower material for obtaining being predicted shaft tower.The quilt determined in the present embodiment
The quantity for predicting multiple measurement points on shaft tower is specially 10, can also be increased or decreased as needed in addition, still
Comparatively, measurement point is more, then the remaining zinc coat average thickness of tower material is more accurate.
In the present embodiment, step 2) the middle least residue thickness t for measuring the tower material seriously corroded region for being predicted shaft tower
Detailed step includes：The measuring surface being predicted on shaft tower is determined first, and polishing measuring surface removes floating rust, paint film or the oxidation on surface
Skin, is then not less than the residual thickness that 0.1mm size measurement instruments detect multiple positions in measuring surface by precision, and from many
Minimum value is taken in the residual thickness of individual position as the least residue thickness t in the tower material seriously corroded region for being predicted shaft tower.Chi
Very little measuring instrument can specifically select the instruments such as band tailpin slide measure, micrometer, sonigauge, and this reality as needed
Apply each region in example and at least measure least residue thickness of the minimum value in 10 data, same all measured values of part for tower material
Degree, is designated as t, unit mm.
In the present embodiment, step 3) detailed step include：It will distinguish with being predicted shaft tower material identical carbon steel and zinc
Dressing plate sample is made, dressing plate sample is individually placed to be predicted exposure 1 year under industrial area residing for shaft tower, carbon steel is detected
Before and after dressing plate specimen test thickness difference (or corrosion weight loss, if detection be corrosion weight loss if corrosion weight loss is changed
Calculation obtains the thickness difference before and after carbon steel dressing plate specimen test), the thickness difference before and after carbon steel dressing plate specimen test is removed
Obtain being predicted the iron rot speed v of industrial area residing for shaft tower with the timeFe, detect the thickness before and after zinc dressing plate specimen test
Difference (or corrosion weight loss, if detection be corrosion weight loss if corrosion weight loss conversion obtained into carbon steel dressing plate specimen test
Front and rear thickness difference), the thickness difference before and after zinc dressing plate specimen test divided by time are obtained being predicted industrial residing for shaft tower
The zine corrosion speed v in areaZn.By a term coupon corrosion test in the present embodiment, method of testing presses GB/T 19292.4-2003
《The corrosive atmosphere corrosivity of metal and alloy is used for the measure of the corrosion rate of the standard specimen of evaluation of corrosion》Perform, will be with
Tower material material identical carbon steel and zinc to be measured are made dressing plate sample, size be usually 150mm length × 100mm it is wide × 1mm is thick,
Exposure 1 year under local atmospheric corrosion environment is placed on, average annual corrosion depth data are obtained, local iron rot speed is measured for vFe=
239 μm/a, zine corrosion speed is vZn=4.5 μm/a.
In the present embodiment, step 4) detailed step include：
4.1) the Simulated Acid Rain solution for being predicted industrial area residing for shaft tower is prepared；
4.2) pre- crackle tensile sample is made (according to GB/T 15970.6 in the tower material sample for being predicted shaft tower《Metal and
The part of corrosion stress corrosion test the 6th of alloy：The preparation and application of pre- precracked specimen under constant load or permanent displacement》Regulation),
By pre- crackle tensile sample by carrying out constant load tension test on slow-drawing stress corrosion test machine, and in slow judgement of speed change
Simulated Acid Rain solution is placed in the solution tank of rate stress corrosion (cracking) test machine and Simulated Acid Rain solution is completely soaked pre- cracked tension
The pre- crackle opening of sample, measures the tower material stress corrosion fracture toughness K for being predicted shaft tower in residing industrial areaISCC；
4.3) based on the tower material design limit load σ for being predicted shaft towerC, stress corrosion fracture toughness KISCC, the original thickness of tower material
Degree h calculates the maximum allowable corrosion depth d of tower material for obtaining being predicted industrial area residing for shaft towerC。
In the present embodiment, step 4.1) detailed step include：Collect that to be predicted industrial area residing for shaft tower at least near first
Specify the Acid Rain pH Value in: Atmospheric of year and calculate pH value of acid rain annual mean x, take NaHSO3(sodium hydrogensulfite) is added to deionization by amount
Simulated Acid Rain solution is configured in water, the pH value of Simulated Acid Rain solution is configured with pH acidometer tracking measurements, makes pH value close to acid
Rain pH annual means x；It is dilute by being added dropwise when the pH value of Simulated Acid Rain solution is less than 0.03 with pH value of acid rain annual mean x difference
H2SO4Solution or NaOH solution are finely adjusted：If 1. Simulated Acid Rain solution ph is higher than pH value of acid rain annual mean x and Simulated Acid Rain
When solution ph and pH value of acid rain annual mean x difference are less than 0.03, dilute H is added dropwise2SO4Solution makes the pH value of Simulated Acid Rain solution
Reduction is more to level off to pH value of acid rain annual mean x, if 2. Simulated Acid Rain solution ph is slightly below pH value of acid rain annual mean x and mould
When intending acid rain solution ph and pH value of acid rain annual mean x difference less than 0.03, NaOH solution, which is added dropwise, makes Simulated Acid Rain pH value of solution
The rise of value passes through that fine setting is final to make the pH value and pH value of acid rain year of Simulated Acid Rain solution more to level off to pH value of acid rain annual mean x
Average value x is completely the same.In the present embodiment, NaHSO3For SILVER REAGENT or the NaHSO of chemical pure (wt% >=99.5%)3；It is near to specify
Year is specifically referred to nearly 10 years.When collecting the Acid Rain pH Value in: Atmospheric for being predicted at least closely specified year in industrial area residing for shaft tower, specifically may be used
To be collected to the environmental monitoring center in industrial area electric power line pole tower target location to be predicted or meteorological department.It is general and
Speech, takes the NaHSO of SILVER REAGENT or chemical pure (wt% >=99.5%)3200~1000 grams of (sodium hydrogensulfite), deionized water 1000
~5000 grams, Simulated Acid Rain solution is configured according to confidential ask of when slow-drawing stress corrosion test.
In the present embodiment, step 4.2) in slow-drawing stress corrosion test machine use YYF-50 type slow strain rates
The Simulated Acid Rain solution prepared is placed in stress corrosion (cracking) test machine, solution tank, it is ensured that solution is completely soaked pre- crackle opening, surveyed
Tower material stress corrosion fracture toughness K of the shaft tower in residing industrial area must be predictedISCC.As shown in Fig. 2 slow strain rate stress is rotten
The arm 11 of extending of the upside of wave gas etching tester 1 is provided with upper fixture 12, and downside is fixed with lower clamp 13, and pre- crackle tensile sample 2 is then
It is separately fixed in upper fixture 12, lower clamp 13, the middle part of pre- crackle tensile sample 2 is plugged in solution tank 3, and solution tank 3 is put
Put Simulated Acid Rain solution 31 and Simulated Acid Rain solution 31 is completely soaked the pre- crackle opening 21 of pre- crackle tensile sample 2；Measurement
It is predicted tower material stress corrosion fracture toughness K of the shaft tower in residing industrial areaISCCWhen, by GB/T 21143-2007《Metal material
The uniform tests method of quasistatic fracture toughness》Regulation measure fracture toughness of the tower material in Simulated Acid Rain solution, measure 3 times
And average above, the numerical value is tower material stress corrosion fracture toughness, is designated as KISCC, unitThe present embodiment
In, it is predicted tower material stress corrosion fracture toughness of the shaft tower in residing industrial area
In the present embodiment, step 4.3) in be predicted the maximum allowable corrosion depth d of tower material of industrial area residing for shaft towerCMeter
Calculate shown in function expression such as formula (2)；
In formula (2), σcTo be predicted the tower material design limit load (being specially 200MPa in the present embodiment) of shaft tower, dcFor
The maximum allowable corrosion depth of tower material of industrial area residing for shaft tower is predicted, h is the tower material original thickness (h=for being predicted shaft tower
10mm), KISCCTo be predicted tower material stress corrosion fracture toughness of the shaft tower in residing industrial areaFinally, ask
Solution obtains the maximum allowable corrosion depth d of tower materialCFor 2mm.
In the present embodiment, the tower material shaft tower surface for being predicted shaft tower has covered red rust, remaining zinc coat average thickness dZnFor 0
μm, it is predicted the maximum allowable corrosion depth d of tower material of industrial area residing for shaft towerCFor 2mm, the tower material maximum corrosion of shaft tower is predicted
Depth d is 1mm, is predicted the iron rot speed v of industrial area residing for shaft towerFeFor 239 μm/a, industrial area residing for shaft tower is predicted
Zine corrosion speed vZnFor 4.5 μm/a, therefore calculate that to be predicted the remaining safe life of corrosion of shaft tower be RL=1000 × (2-1) ÷
The residual life that 239+0 ÷ 4.5=4.2 (year), i.e. the corrosion shaft tower can continue safe operation is 4.2 years, should be before this
Anti-corrosion is arranged to overhaul or renovate engineering to ensure power grid security.
Embodiment two：
The present embodiment and embodiment one are essentially identical, and its main difference is step 3) implementation it is different.
In the present embodiment, step 3) detailed step include：The corrosion ring for being predicted industrial area residing for shaft tower is obtained first
Border is classified, and is then inquired the default corrosive environment maximum corrosion rate table of comparisons (referring to table 1) by classification according to corrosive environment, is obtained
It is predicted the iron rot speed v of industrial area residing for shaft towerFeWith zine corrosion speed vZn。
Table 1：The corrosive environment maximum corrosion rate table of comparisons.
The corrosive environment classification for being predicted industrial area residing for shaft tower can be according to the environment for being predicted shaft tower target location
Monitoring center or atmospheric corrosion station for acquiring are classified to local corrosive environment, and the classification meets GB/T 19292.1-2003《Gold
The corrosive atmosphere corrosion forms of category and alloy》Regulation, have five corrosive grades of C1, C2, C3, C4, C5.
In the present embodiment, the remaining zinc coat average thickness d of tower material of shaft tower is predictedZnFor 30 μm, it is predicted residing for shaft tower
The maximum allowable corrosion depth d of tower material of industrial areaCFor 2mm, the tower material maximum corrosion depth d for being predicted shaft tower is 1mm, is predicted
Industrial area corrosive environment is categorized as C5 residing for shaft tower, then table look-up 1 iron rot speed vFeFor 200 μm/a, it is predicted residing for shaft tower
The zine corrosion speed v of industrial areaZnFor 8.4 μm/a, therefore calculate that to be predicted the remaining safe life of corrosion of shaft tower be RL=1000
The residual life that × (2-1) ÷ 200+30 ÷ 8.4=8.6 (year), i.e. the corrosion shaft tower can continue safe operation is 8.6 years, should
When arranging anti-corrosion maintenance or the engineering that renovates before this to ensure power grid security.
Embodiment three：
The present embodiment and embodiment one are essentially identical, and its main difference is step 3) implementation it is different.
In the present embodiment, step 3) detailed step include：Work residing for being predicted shaft tower is directly calculated according to formula (3) first
The iron rot speed v in industry areaFe, then according to the iron rot speed v for being predicted industrial area residing for shaft towerFeSearch default corrosion
The environment maximum corrosion rate table of comparisons (referring to table 1), obtains being predicted the zine corrosion speed v of industrial area residing for shaft towerZn；
vFe=1000 (h-t) ÷ T (3)
In formula (3), vFeTo be predicted the iron rot speed of industrial area residing for shaft tower, h be predicted shaft tower tower material it is original
Thickness, t is the least residue thickness in the tower material seriously corroded region for being predicted shaft tower, and T is the (list that puts into operation the time for being predicted shaft tower
Position is a).
It should be noted that embodiment one, embodiment two, embodiment three determine that the iron for being predicted industrial area residing for shaft tower is rotten
Lose speed vFeWith zine corrosion speed vZnCycle shorten successively, but computational accuracy is reduced successively, therefore, is filled in the assessment time
It is preferential using the method come above in the case of abundant.
Described above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of industrial area electric power line pole tower Forecast of Remaining Life of Corrosive, it is characterised in that step includes：
1) measurement is predicted the remaining zinc coat average thickness d of tower material of shaft towerZn；
2) measurement is predicted the least residue thickness t in the tower material seriously corroded region of shaft tower, and the tower material for being predicted shaft tower is original
Thickness h subtracts the tower material maximum corrosion depth d that the least residue thickness t obtains being predicted shaft tower；
3) determination is predicted the iron rot speed v of industrial area residing for shaft towerFeWith zine corrosion speed vZn；
4) the maximum allowable corrosion depth d of tower material for being predicted industrial area residing for shaft tower is obtainedC；
5) function expression according to formula (1) calculates the remaining safe life of corrosion for being predicted shaft tower；
RL=1000 (dC-d)÷vFe+dZn÷vZn (1)
In formula (1), RL is the remaining safe life of corrosion for being predicted shaft tower, dCTo be predicted the tower material of industrial area residing for shaft tower most
Big to allow corrosion depth, d is the tower material maximum corrosion depth for being predicted shaft tower, dZnFor the remaining zinc coat of tower material for being predicted shaft tower
Average thickness, vFeTo be predicted the iron rot speed of industrial area residing for shaft tower, vZnTo be predicted the zinc corruption of industrial area residing for shaft tower
Lose speed；
The step 4) detailed step include：
4.1) the Simulated Acid Rain solution for being predicted industrial area residing for shaft tower is prepared；
4.2) pre- crackle tensile sample is made in the tower material sample for being predicted shaft tower, pre- crackle tensile sample is passed through into slow judgement of speed change
Constant load tension test is carried out on rate stress corrosion (cracking) test machine, and is put in the solution tank of slow-drawing stress corrosion test machine
Put the Simulated Acid Rain solution and Simulated Acid Rain solution is completely soaked the pre- crackle opening of pre- crackle tensile sample, measure pre-
Tower material stress corrosion fracture toughness K of the measuring staff tower in residing industrial areaISCC；
4.3) based on the tower material design limit load σ for being predicted shaft towerC, stress corrosion fracture toughness KISCC, tower material original thickness h
Calculate the maximum allowable corrosion depth d of tower material for obtaining being predicted industrial area residing for shaft towerC；
The step 4.3) in be predicted the maximum allowable corrosion depth d of tower material of industrial area residing for shaft towerCCalculating function expression
As shown in formula (2)；
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<mn>0.752</mn>
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In formula (2), σcTo be predicted the tower material design limit load of shaft tower, dcTo be predicted the tower material of industrial area residing for shaft tower most
Big to allow corrosion depth, h is the tower material original thickness for being predicted shaft tower, KISCCTo be predicted tower material of the shaft tower in residing industrial area
Stress corrosion fracture toughness.
2. electric power line pole tower Forecast of Remaining Life of Corrosive in industrial area according to claim 1, it is characterised in that institute
State step 1) detailed step include：The multiple measurement points being predicted on shaft tower are determined first, then pass through magnetic coating thickness measuring
Instrument measurement is predicted the remaining galvanized layer thickness of each measurement point on shaft tower, and according to the remaining galvanized layer thickness of each measurement point
Calculate and obtain the remaining zinc coat average thickness of the tower material for being predicted shaft tower.
3. electric power line pole tower Forecast of Remaining Life of Corrosive in industrial area according to claim 2, it is characterised in that institute
State step 2) in the least residue thickness t detailed step in the measurement tower material seriously corroded region that is predicted shaft tower include：First
It is determined that being predicted the measuring surface on shaft tower, polishing measuring surface removes floating rust, paint film or the oxide skin on surface, then by precision not
The residual thickness of multiple positions in size measurement instruments detection measuring surface less than 0.1mm, and from the residual thickness of multiple positions
In take minimum value as the least residue thickness t in the tower material seriously corroded region for being predicted shaft tower.
4. electric power line pole tower Forecast of Remaining Life of Corrosive in industrial area according to claim 3, it is characterised in that institute
State step 4.1) detailed step include：Collect first and be predicted the Acid Rain pH Value in: Atmospheric that year is at least closely specified in industrial area residing for shaft tower
And pH value of acid rain annual mean x is calculated, take NaHSO3It is added to configuration Simulated Acid Rain solution in deionized water by amount, uses pH acidometers
Tracking measurement configures the pH value of Simulated Acid Rain solution, makes pH value close to pH value of acid rain annual mean x；As the pH of Simulated Acid Rain solution
When value and pH value of acid rain annual mean x difference are less than 0.03, by the way that dilute H is added dropwise2SO4Solution or NaOH solution are finely adjusted：If 1. mould
Intend acid rain solution ph higher than pH value of acid rain annual mean x and Simulated Acid Rain solution ph and pH value of acid rain annual mean x difference are small
When 0.03, dilute H is added dropwise2SO4Solution makes the pH value of Simulated Acid Rain solution reduce more to level off to pH value of acid rain annual mean x, if 2.
Simulated Acid Rain solution ph is slightly below pH value of acid rain annual mean x and Simulated Acid Rain solution ph and pH value of acid rain annual mean x difference
When value is less than 0.03, NaOH solution, which is added dropwise, to be made the rise of Simulated Acid Rain solution ph more to level off to pH value of acid rain annual mean x, is led to
Crossing fine setting finally makes the pH value and pH value of acid rain annual mean x of Simulated Acid Rain solution completely the same.
5. electric power line pole tower Forecast of Remaining Life of Corrosive in industrial area according to claim 4, it is characterised in that institute
State NaHSO3For SILVER REAGENT or the pure NaHSO of chemistry3。
6. the industrial area electric power line pole tower Forecast of Remaining Life of Corrosive according to any one in Claims 1 to 5,
Characterized in that, the step 3) detailed step include：It will be respectively prepared with being predicted shaft tower material identical carbon steel and zinc
Dressing plate sample, is individually placed to be predicted exposure 1 year under industrial area residing for shaft tower by dressing plate sample, detects carbon steel standard
Plane plate specimen experiment before and after thickness difference or corrosion weight loss, if detection be corrosion weight loss if by corrosion weight loss conversion obtain
Thickness difference before and after carbon steel dressing plate specimen test, the thickness difference before and after carbon steel dressing plate specimen test divided by time are obtained
To the iron rot speed v for being predicted industrial area residing for shaft towerFe, detection zinc dressing plate specimen test before and after thickness difference or corruption
Erosion is weightless, if detection be corrosion weight loss if corrosion weight loss is converted the thickness before and after obtaining carbon steel dressing plate specimen test
Difference, the thickness difference before and after zinc dressing plate specimen test divided by time is obtained being predicted the zine corrosion speed of industrial area residing for shaft tower
Rate vZn。
7. the industrial area electric power line pole tower Forecast of Remaining Life of Corrosive according to any one in Claims 1 to 5,
Characterized in that, the step 3) detailed step include：The corrosive environment point for being predicted industrial area residing for shaft tower is obtained first
Class, then inquires the default corrosive environment maximum corrosion rate table of comparisons by classification according to corrosive environment, obtains being predicted shaft tower institute
Locate the iron rot speed v of industrial areaFeWith zine corrosion speed vZn。
8. the industrial area electric power line pole tower Forecast of Remaining Life of Corrosive according to any one in Claims 1 to 5,
Characterized in that, the step 3) detailed step include：Industrial area residing for being predicted shaft tower is directly calculated according to formula (3) first
Iron rot speed vFe, then according to the iron rot speed v for being predicted industrial area residing for shaft towerFeSearch default corrosive environment
The maximum corrosion rate table of comparisons, obtains being predicted the zine corrosion speed v of industrial area residing for shaft towerZn；
vFe=1000 (h-t) ÷ T (3)
In formula (3), vFeTo be predicted the iron rot speed of industrial area residing for shaft tower, h is the tower material original thickness for being predicted shaft tower,
T is the least residue thickness in the tower material seriously corroded region for being predicted shaft tower, and T is to be predicted putting into operation the time for shaft tower.
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| CN112067536B (en) * | 2020-07-21 | 2024-05-17 | 国网山东省电力公司电力科学研究院 | Method and system for evaluating atmospheric corrosion safety state of in-service engineering |
| CN112069665B (en) * | 2020-08-21 | 2022-09-13 | 国家电网公司华中分部 | Residual life and safety assessment method for transmission tower |
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