CN111199082B - Pipeline erosion rate obtaining method - Google Patents
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- CN111199082B CN111199082B CN201811286572.5A CN201811286572A CN111199082B CN 111199082 B CN111199082 B CN 111199082B CN 201811286572 A CN201811286572 A CN 201811286572A CN 111199082 B CN111199082 B CN 111199082B
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- 230000003628 erosive effect Effects 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000000428 dust Substances 0.000 claims abstract description 94
- 239000002245 particle Substances 0.000 claims abstract description 93
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000003345 natural gas Substances 0.000 claims abstract description 29
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims abstract description 11
- 230000003116 impacting effect Effects 0.000 claims abstract description 4
- 230000001105 regulatory effect Effects 0.000 claims description 14
- 239000010865 sewage Substances 0.000 claims description 8
- 238000002474 experimental method Methods 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 3
- 238000001493 electron microscopy Methods 0.000 claims description 2
- 238000011156 evaluation Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 5
- 239000006004 Quartz sand Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000007546 Brinell hardness test Methods 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/18—Complex mathematical operations for evaluating statistical data, e.g. average values, frequency distributions, probability functions, regression analysis
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Abstract
The invention discloses a method for acquiring the erosion rate of a pipeline, and belongs to the field of pipeline loss evaluation. The method comprises the following steps: and acquiring Brinell hardness factors, speeds and shape factors of the dust particles, and acquiring erosion angles of the dust particles impacting the inner wall of the pipeline. And acquiring the pipe wall loss amount caused by the dust particles per unit mass according to the Brinell hardness factor, the speed, the dust particle shape factor and the erosion angle of the dust particles. And acquiring the mass of the dust particles passing through the pipeline in unit time, and acquiring the erosion rate of the pipeline according to the pipe wall loss caused by the dust particles in unit time and the mass of the dust particles passing through the pipeline in unit time. The method can be used for acquiring the pipeline erosion rate when the natural gas medium carrying the dust particles flows in the pipeline, and the accuracy is higher when the method is applied to acquiring the pipeline erosion rate in the process assembly of the gas transmission station.
Description
Technical Field
The invention relates to the field of pipeline loss evaluation, in particular to a method for acquiring a pipeline erosion rate.
Background
The gas transmission station process assembly comprises a sewage discharge unit, a pressure regulating unit, a manifold unit and the like. When natural gas flows in the process assembly of the gas transmission station, dust particles in the natural gas can impact the pipe wall of each unit pipeline, so that the pipe wall is eroded. When the pipe wall is eroded seriously, the pipeline needs to be replaced in time, so that safety accidents are avoided. In order to evaluate the erosion degree of the pipe wall of each unit of the process kit of the gas transmission station, it is necessary to provide a method for acquiring the erosion rate of the pipe.
The erosion rate was obtained by the related art using an alkert model erosion rate model proposed by Tusla university in 1994. The model was obtained by the following experiment: the air carrying the quartz sand flows in the pipeline made of carbon steel and aluminum materials, the erosion rate of the air carrying the quartz sand to the pipe wall is obtained, and then the influences of the flow rate of the air containing the quartz sand in the pipeline, the particle size of the quartz sand and the like on the erosion rate of the pipe wall are summarized.
The inventor finds that the prior art has at least the following problems:
the model is obtained in an experimental environment, and for a gas transmission station process component with natural gas as a medium in a pipeline and dust particles carried in the medium, the pipeline erosion rate error obtained by calculation of the model is large.
Disclosure of Invention
The embodiment of the invention provides a method for acquiring the erosion rate of a pipeline, which can solve the technical problem. The specific technical scheme is as follows:
a pipeline erosion rate obtaining method is applied to a pipeline for conveying a natural gas medium in a process component of a gas transmission station, wherein the natural gas medium carries dust particles;
the method comprises the following steps: acquiring a Brinell hardness factor, a speed and a dust particle shape factor of the dust particles;
acquiring an erosion angle of the dust particles impacting the inner wall of the pipeline;
according to the Brinell hardness factor, the speed, the dust particle shape factor and the erosion angle of the dust particles, acquiring the pipe wall loss caused by the dust particles of unit mass by using the following formula;
wherein,
ER represents the pipe wall loss amount caused by unit mass of dust particles, and the unit is kg/kg;
b represents the brinell hardness factor of the dust particles, no dimension;
v p represents the velocity of the dust particles in m/s;
F s dust particles representing dust particlesForm factor, dimensionless;
α represents the erosion angle in °;
the pipeline comprises a sewage discharge unit pipeline, a pressure regulating unit pipeline and a manifold unit pipeline;
for the blowdown unit pipe, the f (α) is obtained by the following formula:
f(α)＝9.6exp(-0.015α)-8.2exp(-0.03α)；
for the pressure regulating unit duct, the f (α) is obtained by the following formula:
f(α)＝2.0exp(-0.016α)-16.0exp(-0.03α)；
for the manifold unit duct, the f (α) is obtained by the following formula:
f(α)＝19.4exp(-0.01568α)-17.0exp(-0.0239α)
acquiring the mass of dust particles passing through a pipeline in unit time;
and acquiring the pipeline erosion rate according to the pipe wall loss caused by the unit mass of the dust particles and the mass of the dust particles passing through the pipeline in the unit time.
In one possible design, the erosion angle is 30 ° to 60 ° for the blowdown unit pipe;
for the pressure regulating unit pipeline, the erosion angle is 60-90 degrees;
the erosion angle is 20-45 ° for the manifold unit duct.
In one possible design, acquiring the velocity of the dust particles includes:
acquiring the sectional area of a pipeline and the natural gas flow in the pipeline;
and acquiring the speed of the dust particles according to the natural gas flow and the pipeline sectional area.
In one possible design, the mass of dust particles passing in the duct per unit time is obtained by sampling experiments.
In one possible design, the brinell hardness factor is obtained by taking a sample and then performing a hardness test.
In one possible design, the dust particle shape factor is obtained by electron microscopy experiments.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
according to the method for acquiring the erosion rate of the pipeline provided by the embodiment of the invention, the loss amount of the pipeline wall caused by the dust particles of unit mass is acquired through the Brinell hardness factor, the speed, the shape factor and the erosion angle of the dust particles. And then acquiring the erosion rate of the pipeline through the loss amount of the pipeline wall caused by the unit mass of the dust particles and the mass of the dust particles passing through the pipeline in unit time. The method can be used for acquiring the pipeline erosion rate when the natural gas medium carrying the dust particles flows in the pipeline, and the precision is higher when the method is applied to acquiring the pipeline erosion rate in the process assembly of the gas transmission station.
Detailed Description
Unless defined otherwise, all technical terms used in the examples of the present invention have the same meaning as commonly understood by one of ordinary skill in the art. In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below.
The embodiment of the invention provides a method for acquiring the erosion rate of a pipeline, which is applied to a pipeline for conveying a natural gas medium in a process assembly of a gas transmission station, wherein the natural gas medium carries dust particles.
The method comprises the following steps: acquiring Brinell hardness factor, speed and shape factor of the dust particles;
acquiring an erosion angle of dust particles impacting the inner wall of the pipeline;
according to the Brinell hardness factor, the speed, the shape factor and the erosion angle of the dust particles, the pipe wall loss caused by the dust particles of unit mass is obtained by using the following formula;
and then acquiring the mass of the dust particles passing through the pipeline in unit time, and acquiring the erosion rate of the pipeline according to the pipe wall loss caused by the dust particles in unit time and the mass of the dust particles passing through the pipeline in unit time.
Wherein,
wherein ER represents the loss amount of the pipe wall caused by unit mass of dust particles, and the unit is kg/kg;
b represents the brinell hardness factor of the dust particles, no dimension;
v p represents the velocity of the dust particles in m/s;
F s a dust particle shape factor, dimensionless, representing dust particles;
α represents the erosion angle in units of.
The pipeline comprises a sewage discharge unit pipeline, a pressure regulating unit pipeline and a manifold unit pipeline;
for the blowdown unit pipe, f (α) is obtained by the following equation:
f(α)＝9.6exp(-0.015α)-8.2exp(-0.03α)；
for the pressure regulating unit duct, f (α) is obtained by the following formula:
f(α)＝2.0exp(-0.016α)-16.0exp(-0.03α)；
for a manifold unit pipe, f (α) is obtained by the following formula:
f(α)＝19.4exp(-0.01568α)-17.0exp(-0.0239α)。
according to the Brinell hardness factor, the speed, the dust particle shape factor and the erosion angle of the dust particles, the pipe wall loss amount caused by the unit mass of the dust particles can be obtained by using the formula. The pipe wall loss amount in unit time, namely the pipeline erosion rate, can be obtained by multiplying the pipe wall loss amount caused by the unit mass of the dust particles by the mass of the dust particles passing through the pipeline in unit time. Wherein, the pipe wall loss is the quality lost by the pipeline under the erosion.
When the pipeline erosion rates in different units are calculated, the functional relations between f (alpha) and the erosion angles are different, so that the calculated pipeline erosion rates in different units can reflect the erosion conditions in the pipelines more truly, and the calculation precision is higher.
According to the method for acquiring the erosion rate of the pipeline, provided by the embodiment of the invention, the loss amount of the pipeline wall caused by the dust particles of unit mass is acquired through the Brinell hardness factor, the speed, the shape factor of the dust particles and the erosion angle of the dust particles. And then acquiring the erosion rate of the pipeline through the loss amount of the pipeline wall caused by the unit mass of the dust particles and the mass of the dust particles passing through the pipeline in unit time. The method can be used for acquiring the pipeline erosion rate when the natural gas medium carrying dust particles flows in the pipeline, and the precision is higher when the method is applied to acquiring the pipeline erosion rate in the process assembly of the gas transmission station.
The gas transmission station process assembly comprises a sewage discharge unit, a pressure regulating unit and a manifold unit, wherein the pressure regulating unit is connected between the sewage discharge unit and the manifold unit, and the erosion rate calculation process of each unit is different due to different properties of fluids in each unit.
For the values of the erosion angle, examples are given below:
for the sewage disposal unit pipeline, the erosion angle is 30 degrees to 60 degrees, and when the calculation is carried out, a certain numerical value of the interval can be taken, for example, 30 degrees, 45 degrees and 60 degrees, and the numerical value can be substituted into the calculation to obtain an erosion rate, or two end values of the interval are respectively substituted into the calculation to obtain two end values of the erosion rate, and the interval range of the erosion rate of the sewage disposal unit is determined.
The value of the erosion angle can be suitable for calculating the erosion rate of the valve core plane of the blowdown valve in the blowdown unit pipeline.
For the pressure regulating unit pipeline, the erosion angle is 60 ° to 90 °, and during calculation, a certain value in the interval may be taken, for example, 60 °, 75 °, and 90 °, and the value may be substituted into the calculation to obtain an erosion rate, or two end values in the interval may be substituted into the calculation to obtain two end values of the erosion rate, and an interval range of the erosion rate is determined.
The value of the erosion angle can be suitable for calculating the erosion rate of the incident flow surface of the valve core of the pressure regulating valve in the pipeline of the pressure regulating unit.
For the manifold unit pipe, the erosion angle is 20 ° to 45 °, and during calculation, a certain value of the interval may be taken, for example, 20 °, 30 °, and 45 °, and the value is substituted into the calculation to obtain an erosion rate, or two end values of the interval are substituted into the calculation to obtain end values of two erosion rates, and an interval range of the erosion rate is determined.
The value of the erosion angle can be suitable for calculating the erosion rate of the tee joint in the pipeline of the manifold unit.
The numerical value of the erosion angle in each unit pipeline is given, so that the method is applied to the acquisition of the pipeline erosion rate, the condition that dust particles in natural gas medium impact the inner wall of the pipeline does not need to be analyzed in a complex manner, and the analysis process is simplified under the condition that the calculation precision is not influenced.
It will be appreciated that the erosion angle, i.e. the angle at which the dust particles impact the pipe, can be expressed in terms of the angle between the path of the dust particles and the inner wall of the pipe, for example, zhengsijia.
For how the speed of the dust particles is obtained, an example description is given below:
as an example, acquiring the velocity of the dust particles includes: and acquiring the sectional area of the pipeline and the natural gas flow in the pipeline, and acquiring the particle speed of the dust particles according to the natural gas flow and the sectional area of the pipeline.
When the pipeline erosion rate at a certain position needs to be obtained, the flow rate of the natural gas in the pipeline is measured, then the sectional area of the pipeline is measured, the flow rate of the natural gas in the pipeline is obtained by dividing the sectional area by the flow rate of the natural gas, the dust particles flow in the pipeline along with the natural gas, and the flow rate of the natural gas is the speed of the dust particles.
The natural gas flow can be measured by an external clamp type ultrasonic flowmeter. The sectional area of the pipeline, namely the area of the cross section of the pipeline, can be calculated by measuring the diameter of the pipeline.
How to obtain the mass of dust particles passing through the pipe per unit time is explained below:
the mass of dust particles passing through the pipeline in unit time is obtained through a sampling experiment. For example, natural gas transported in a pipeline for a period of time can be collected as a sample, then the dust particles are separated by filtering or precipitating the natural gas sample, the mass of the dust particles in the natural gas sample is counted, and the mass of the dust particles passing through the pipeline per unit time can be obtained by dividing the mass by the time.
Or, the parameters of dust concentration, quality and the like are obtained on line through a sampling device, and the sampling method can be a method mentioned in the following documents: zhang xing, ji Zhong Li, chen hong Hai, etc. A method for online detection of dust in a high-pressure natural gas pipeline [ J ]. Chemical, 2010, 61 (9): 2334-2339.
The Brinell hardness factor is obtained by performing a hardness test after sampling, and the method for obtaining the Brinell hardness factor by the Brinell hardness test is a conventional technical means in the field, and is not described in detail in the embodiment of the invention.
The dust particle shape factor is obtained by electron microscope experiments. The specific operation process is a conventional technical means in the art, and details are not described in the embodiment of the present invention.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. The method for acquiring the erosion rate of the pipeline is characterized by being applied to a pipeline for conveying natural gas medium in a process component of a gas transmission station, wherein the natural gas medium carries dust particles;
the method comprises the following steps: acquiring Brinell hardness factor, speed and dust particle shape factor of the dust particles;
acquiring an erosion angle of the dust particles impacting the inner wall of the pipeline;
according to the Brinell hardness factor, the speed, the dust particle shape factor and the erosion angle of the dust particles, acquiring the pipe wall loss caused by the dust particles of unit mass by using the following formula;
wherein,
ER represents the pipe wall loss amount caused by unit mass of dust particles, and the unit is kg/kg;
b represents the Brinell hardness factor of the dust particles, dimensionless;
v p represents the velocity of the dust particles in m/s;
F s a dust particle shape factor, dimensionless, representing dust particles;
α represents the erosion angle in °;
the pipeline comprises a sewage discharge unit pipeline, a pressure regulating unit pipeline and a manifold unit pipeline;
for the blowdown unit pipe, the f (α) is obtained by the following formula:
f(α)＝9.6exp(-0.015α)-8.2exp(-0.03α)；
for the pressure regulating unit duct, f (α) is obtained by the following formula:
f(α)＝2.0exp(-0.016α)-16.0exp(-0.03α)；
for the manifold unit pipe, the f (α) is obtained by the following formula:
f(α)＝19.4exp(-0.01568α)-17.0exp(-0.0239α)
acquiring the mass of dust particles passing through a pipeline in unit time;
and acquiring the pipeline erosion rate according to the pipe wall loss caused by the unit mass of the dust particles and the mass of the dust particles passing through the pipeline in the unit time.
2. The method of claim 1, wherein the erosion angle is 30-60 ° for the blowdown unit pipe;
for the pressure regulating unit pipeline, the erosion angle is 60-90 degrees;
for the manifold unit pipe, the erosion angle is 20-45 °.
3. The method of any of claims 1-2, wherein obtaining the velocity of the dust particles comprises:
acquiring the sectional area of a pipeline and the natural gas flow in the pipeline;
and acquiring the speed of the dust particles according to the natural gas flow and the pipeline sectional area.
4. A method according to claim 1, characterized in that the mass of dust particles passing in the pipe per unit time is obtained by sampling experiments.
5. The method of claim 1, wherein the brinell hardness factor is obtained by performing a hardness test after sampling.
6. The method of claim 1, wherein the dust particle shape factor is obtained by electron microscopy experiments.
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