CN104989958A - Positioning method for blocking position of ore slurry conveying pipeline - Google Patents
Positioning method for blocking position of ore slurry conveying pipeline Download PDFInfo
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- CN104989958A CN104989958A CN201510458515.0A CN201510458515A CN104989958A CN 104989958 A CN104989958 A CN 104989958A CN 201510458515 A CN201510458515 A CN 201510458515A CN 104989958 A CN104989958 A CN 104989958A
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Abstract
The invention provides a positioning method for blocking positions of an ore slurry conveying pipeline, and relates to a conveying control method, and especially relates to a method for determining blocked points in blocking management in an ore slurry conveying process. A positive pressure wave method is used to detect blocking of a pipeline according to violent changes of pressure differences of two ends of the pipeline before the pipeline is blocked and after the pipeline is blocked, and a principle and a method for determining ore slurry pipeline blocking positions by using positive pressure waves in a pipeline hydraulic surge process are provided for the first time. The method is advantaged by few required devices, low operation cost, and simple operation, and is better than existing pipeline blocking position determination methods.
Description
Technical field
The present invention relates to a kind of conveyance control method, particularly in pulp conveying process, during conveying management blocking, determine the method blocking point.
Background technique
In ore pulp delivery duct; due to the impact of the factors such as the de-magnetic of ore pulp, ore pulp particle diameter, transportation concentration be not up to standard; ore pulp easily forms magnetic strand in the duct to be practiced or coarse granule ore pulp is deposited on duct bottom and causes discharge pressure to increase as adjusted not in time, line clogging when shutdown can be caused to restart.In addition, in ore slurry pipeline pigging process, the accumulation of impurities of pipe interior, easily causes wiper to block, and will cause huge economic loss if can not process in time.At present, pipeline blocking position detection technique mainly contains boring method, hammering method, stress-strain test method etc.These methods all need pipe excavation to expose, and observe fluid state along the continuous testing conduit deformation extent of pipeline or boring, and workload is large, and consuming time longer, operating cost is high.Once there is blocking accident in ore pulp delivery duct, if find will cause pipeline breaking, environmental pollution and peril etc. not in time, simultaneously also because of the blocking of transfer ore pulp, if can not dredge, portions or whole piece pipeline will be scrapped, bring great economic loss to enterprise, find line clogging therefore in time, rapidly and accurately judge that blocking point becomes the task of top priority of pipeline safety smooth running.
Summary of the invention
Object of the present invention is intended to the defect overcoming prior art, provides one to utilize transition positive pressure wave, only needs the pressure change of monitoring fluids within pipes, without the need to excavating pipeline, little investment, easy to operate, the method for ore pulp delivery duct blocking position can be determined within a short period of time.
The method of ore pulp delivery duct blocking position of the present invention, the steps include:
(1), when ore pulp is normally carried, pipeline hydraulic slope curve is completely curve 1, and now the pressure reduction at pipeline two ends is △ p
1;
(2) as distance pipeline starting point χ
0after place's generating portion blocking, before blocking point, pipeline builds the pressure, and the pipeline section after blocking point is owing to losing portion of energy supply, and its hydraulic slope curve is curve 2;
(3) as distance pipeline starting point χ
0after blocking completely occurs at place, because pipeline builds the pressure before blocking point, and in pipeline, ore pulp stops flowing substantially, and the pipeline section after blocking point supplies due to degradedness, in pipeline, ore pulp stops flowing substantially, abrupt pressure reduction, its hydraulic slope curve is curve 3, and now pressure reduction is △ p
2;
(4) when at distance ducts upstream pumping plant χ
0after place blocks, t
1in the moment, pressurize to pipeline at ducts upstream pumping plant air compressor, produce a pulse barotropic wave, it will be propagated along pipeline to downstream pump station, t
2arrive blocking point be obstructed and upstream propagate, at t
3moment gets back to ducts upstream pumping plant, and arrive the time difference of ducts upstream pump station pressure transmitter by catching barotropic wave for twice, more just can determine line clogging position in conjunction with malleation velocity of wave propagation, its ranging formula is formula:
χ
0=
χ in formula
0represent ore slurry pipeline blocking position;
A represents barotropic wave transport velocity;
Δ t (t
3-t
1)represent that barotropic wave is delivered to the time difference of ducts upstream pumping plant for twice;
(5) overpressure velocity of wave propagation is decided by the factors such as the elasticity of the elasticity of fluid, density, tubing, calculates according to the following formula:
a=
A--overpressure wave loops speed in formula, m/s
The volume modulus of K--transfer ore pulp, Pa
The density of ρ--transfer ore pulp, kg/m
3
The Young's modulus of e--pipe material, Pa
D--pipe diameter, m
E--pipe thickness, m
1--the correction factor relevant with pipeline constraint conditio, general=1
The pressure at Real-Time Monitoring pipeline two ends, effectively can find the blocking of pipeline by the acute variation of two ends pressure reduction.
The present invention proposes and utilize positive pressure wave method, the acute variation of line clogging rear and front end pressure reduction is carried out to the blocking of testing pipes, and propose principle and the method for the barotropic wave determination ore slurry pipeline blocking position utilized in Pipeline Water Hammer process first.Its principle is: when line clogging, sends a pulse barotropic wave at pipeline head end, and barotropic wave rebounds to head end propagation after pipeline propagates down stream meets obstruction, can obtain twice barotropic wave information at pipeline head end; By gathering pipeline head end pressure signal, obtaining the time difference that barotropic wave passes twice through sensor, finally just can determine the position of line clogging in conjunction with barotropic wave velocity of wave.The method has that equipment needed thereby is few, operating cost is low, simple operation and other advantages, is better than existing line clogging location determining method.
Ore pulp delivery duct blocking position localization method of the present invention, when there is blocking in ore slurry pipeline, at blocking point, the flowing of ore pulp is hindered, be squeezed and pressure increase, after acquiring a certain degree, in the pipeline before blocking point with blocking point under differential pressure action, blocking point ore pulp constantly expands to ducts upstream, is equivalent to block some place and creates the barotropic wave propagated with certain speed.Therefore, barotropic wave method is highly suitable for the jam detection to long-distance transport pipes.Utilize hardware device needed for barotropic wave method determination ore slurry pipeline blocking position few, greatly reduce the workload of testing process, and the real time on-line monitoring to ore slurry pipeline running state can be realized, be better than existing ore slurry pipeline choke detecting method.
Accompanying drawing explanation
Fig. 1 is hydraulic slope plotted curve in conveyance conduit of the present invention;
Fig. 2 be ore slurry pipeline blockage positioning former be figure.
Embodiment
Below in conjunction with embodiment, the present invention is described further, but be not limited to embodiment.
Embodiment 1
Ore pulp delivery duct blocking position localization method of the present invention, the steps include:
The method of ore pulp delivery duct blocking position of the present invention, the steps include:
(1), when ore pulp is normally carried, pipeline hydraulic slope curve is completely curve 1, and now the pressure reduction at pipeline two ends is △ p
1;
(2) as distance pipeline starting point χ
0after place's generating portion blocking, before blocking point, pipeline builds the pressure, and the pipeline section after blocking point is owing to losing portion of energy supply, and its hydraulic slope curve is curve 2;
(3) as distance pipeline starting point χ
0after blocking completely occurs at place, because pipeline builds the pressure before blocking point, and in pipeline, ore pulp stops flowing substantially, and the pipeline section after blocking point supplies due to degradedness, in pipeline, ore pulp stops flowing substantially, abrupt pressure reduction, its hydraulic slope curve is curve 3, and now pressure reduction is △ p
2;
(4) when at distance ducts upstream pumping plant χ
0after place blocks, t
1in the moment, pressurize to pipeline at ducts upstream pumping plant air compressor, produce a pulse barotropic wave, it will be propagated along pipeline to downstream pump station, t
2arrive blocking point be obstructed and upstream propagate, at t
3moment gets back to ducts upstream pumping plant, and arrive the time difference of ducts upstream pump station pressure transmitter by catching barotropic wave for twice, more just can determine line clogging position in conjunction with malleation velocity of wave propagation, its ranging formula is formula:
χ
0=
χ in formula
0represent ore slurry pipeline blocking position;
A represents barotropic wave transport velocity;
Δ t (t
3-t
1)represent that barotropic wave is delivered to the time difference of ducts upstream pumping plant for twice;
(6) overpressure velocity of wave propagation is decided by the factors such as the elasticity of the elasticity of fluid, density, tubing, calculates according to the following formula:
a=
A--overpressure wave loops speed in formula, m/s
The volume modulus of K--transfer ore pulp, Pa
The density of ρ--transfer ore pulp, kg/m
3
The Young's modulus of e--pipe material, Pa
D--pipe diameter, m
E--pipe thickness, m
1--the correction factor relevant with pipeline constraint conditio, general=1
The pressure at Real-Time Monitoring pipeline two ends, effectively can find the blocking of pipeline by the acute variation of two ends pressure reduction.
Embodiment 2
Certain ore slurry pipeline domestic in 2014 due to ore pulp without demagnetizer through the de-magnetic treatment of row, at that time owing to being that thunderstorm weather causes this ore slurry pipeline pumping plant to be shut down, when being with slurry shutdown to restart, find that outlet pressure sharply rises, through operator's micro-judgment pipeline generation blocking accident, this ore slurry pipeline internal diameter D is 253mm, pulp density ρ is 2073kg/m
3,pipe material elastic modulus E is 2.07*10^11pa, pipeline wall thickness e is 10mm, a pumping plant is 12.5 kilometers apart from downstream pump station distance L, the volumetric modulus of elasticity recording transfer ore pulp through experiment is 27*10^7pa, record negative pressure velocity of wave by theory calculate and be about 989m/s, checking in by SCADA computer program the time difference Δ t that barotropic wave is delivered to upstream pumping unit for twice is again 18.2 seconds, ore slurry pipeline blockage positioning formula theory calculate is utilized to obtain blocking point at this pipeline 9 km, inform by telephone emergency personnel and excavate pipeline confirmation at this pipeline 9 km place, confirm that blocking point is at this pipeline 9.65 km through emergency personnel.
Claims (3)
1. a method for ore pulp delivery duct blocking position, is utilize transition positive pressure wave in pipeline to carry out the method for timely monitor, it is characterized in that, the steps include:
(1), when ore pulp is normally carried, pipeline hydraulic slope curve is completely curve 1, and now the pressure reduction at pipeline two ends is △ p
1;
(2) as distance pipeline starting point χ
0after place's generating portion blocking, before blocking point, pipeline builds the pressure, and the pipeline section after blocking point is owing to losing portion of energy supply, and its hydraulic slope curve is curve 2;
(3) as distance pipeline starting point χ
0after blocking completely occurs at place, because pipeline builds the pressure before blocking point, and in pipeline, ore pulp stops flowing substantially, and the pipeline section after blocking point supplies due to degradedness, in pipeline, ore pulp stops flowing substantially, abrupt pressure reduction, its hydraulic slope curve is curve 3, and now pressure reduction is △ p
2;
(4) when at distance ducts upstream pumping plant χ
0after place blocks, t
1in the moment, pressurize to pipeline at ducts upstream pumping plant air compressor, produce a pulse barotropic wave, it will be propagated along pipeline to downstream pump station, t
2arrive blocking point be obstructed and upstream propagate, at t
3moment gets back to ducts upstream pumping plant, arrives the time difference of ducts upstream pump station pressure transmitter by catching barotropic wave for twice, then adopts ranging formula just can determine line clogging position in conjunction with malleation velocity of wave propagation;
(5) overpressure velocity of wave propagation is decided by the factors such as the elasticity of the elasticity of fluid, density, tubing, and the pressure at Real-Time Monitoring pipeline two ends, effectively can find the blocking of pipeline by the acute variation of two ends pressure reduction.
2. the method for a kind of ore pulp delivery duct blocking position according to claim 1, is characterized in that, the ranging formula described in step (4) is:
χ
0=
χ in formula
0represent ore slurry pipeline blocking position;
A represents barotropic wave transport velocity;
Δ t (t
3-t
1)represent that barotropic wave is delivered to the time difference of ducts upstream pumping plant for twice.
3. the method for a kind of ore pulp delivery duct blocking position according to claim 1, is characterized in that, the overpressure velocity of wave propagation described in step (5), and it determines that mode is:
a=
A--overpressure wave loops speed in formula, unit is m/s
The volume modulus of K--transfer ore pulp, unit is Pa
The density of ρ--transfer ore pulp, unit is kg/m
3
The Young's modulus of e--pipe material, unit is Pa
D--pipe diameter, unit is m
E--pipe thickness, unit is m
1--the correction factor relevant with pipeline constraint conditio is 1.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105698008A (en) * | 2016-02-24 | 2016-06-22 | 昆明理工大学 | Accelerated flow energy dissipation and energy feedback device of iron concentrate slurry pipeline and control method of device |
| CN105927862A (en) * | 2016-04-21 | 2016-09-07 | 中国矿业大学 | Method for acoustically monitoring blockage of gas extraction pipeline |
| CN107120536A (en) * | 2017-06-19 | 2017-09-01 | 杨力 | A kind of distributed pipeline state intelligent monitoring system |
| CN107329167A (en) * | 2017-06-09 | 2017-11-07 | 中国石油大学(北京) | Detect method, system and the computer storage media of pipeline sediment distribution |
| CN107505649A (en) * | 2017-07-19 | 2017-12-22 | 防城港市港口区晶通科技有限公司 | A kind of judgement chemical industry scene drain valve block system based on sound speed detection |
| CN109695823A (en) * | 2019-02-28 | 2019-04-30 | 中国海洋石油集团有限公司 | A kind of pressure test device and method of slurries line clogging early warning |
| CN113551699A (en) * | 2021-09-17 | 2021-10-26 | 山东德仕化工有限公司 | Method and equipment for detecting blockage of oil well pipeline |
| CN114803522A (en) * | 2022-02-09 | 2022-07-29 | 华能济宁运河发电有限公司 | Pilot-operated type low-pressure energy-saving embolism conveying system |
| CN117741670A (en) * | 2024-02-19 | 2024-03-22 | 北京云庐科技有限公司 | Gas courtyard line water blockage monitoring and positioning method |
-
2015
- 2015-07-30 CN CN201510458515.0A patent/CN104989958A/en active Pending
Non-Patent Citations (1)
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|---|
| 姚福强等: "基于LabVIEW管道泄漏检测***的研究", 《管道技术与设备》 * |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105698008A (en) * | 2016-02-24 | 2016-06-22 | 昆明理工大学 | Accelerated flow energy dissipation and energy feedback device of iron concentrate slurry pipeline and control method of device |
| CN105927862A (en) * | 2016-04-21 | 2016-09-07 | 中国矿业大学 | Method for acoustically monitoring blockage of gas extraction pipeline |
| CN105927862B (en) * | 2016-04-21 | 2018-08-07 | 中国矿业大学 | A kind of method that sound wave monitoring gas pumping pipeline blocks |
| CN107329167B (en) * | 2017-06-09 | 2019-05-07 | 中国石油大学(北京) | Detect method, system and the computer storage media of pipeline sediment distribution |
| CN107329167A (en) * | 2017-06-09 | 2017-11-07 | 中国石油大学(北京) | Detect method, system and the computer storage media of pipeline sediment distribution |
| CN107120536A (en) * | 2017-06-19 | 2017-09-01 | 杨力 | A kind of distributed pipeline state intelligent monitoring system |
| CN107505649A (en) * | 2017-07-19 | 2017-12-22 | 防城港市港口区晶通科技有限公司 | A kind of judgement chemical industry scene drain valve block system based on sound speed detection |
| CN109695823A (en) * | 2019-02-28 | 2019-04-30 | 中国海洋石油集团有限公司 | A kind of pressure test device and method of slurries line clogging early warning |
| CN113551699A (en) * | 2021-09-17 | 2021-10-26 | 山东德仕化工有限公司 | Method and equipment for detecting blockage of oil well pipeline |
| CN113551699B (en) * | 2021-09-17 | 2022-01-11 | 山东德仕化工有限公司 | Method and equipment for detecting blockage of oil well pipeline |
| CN114803522A (en) * | 2022-02-09 | 2022-07-29 | 华能济宁运河发电有限公司 | Pilot-operated type low-pressure energy-saving embolism conveying system |
| CN117741670A (en) * | 2024-02-19 | 2024-03-22 | 北京云庐科技有限公司 | Gas courtyard line water blockage monitoring and positioning method |
| CN117741670B (en) * | 2024-02-19 | 2024-04-16 | 北京云庐科技有限公司 | Gas courtyard line water blockage monitoring and positioning method |
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