CN104772310A - Descaling method for long-distance high-concentration iron ore slurry conveying pipeline - Google Patents
Descaling method for long-distance high-concentration iron ore slurry conveying pipeline Download PDFInfo
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- CN104772310A CN104772310A CN201410013838.4A CN201410013838A CN104772310A CN 104772310 A CN104772310 A CN 104772310A CN 201410013838 A CN201410013838 A CN 201410013838A CN 104772310 A CN104772310 A CN 104772310A
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- China
- Prior art keywords
- pipeline
- wiper
- pipe cleaner
- pipe
- descaling method
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
- B08B9/053—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2209/00—Details of machines or methods for cleaning hollow articles
- B08B2209/02—Details of apparatuses or methods for cleaning pipes or tubes
- B08B2209/027—Details of apparatuses or methods for cleaning pipes or tubes for cleaning the internal surfaces
- B08B2209/04—Details of apparatuses or methods for cleaning pipes or tubes for cleaning the internal surfaces using cleaning devices introduced into and moved along the pipes
- B08B2209/053—Details of apparatuses or methods for cleaning pipes or tubes for cleaning the internal surfaces using cleaning devices introduced into and moved along the pipes being moved along the pipes by a fluid, e.g. by fluid pressure or by suction
Abstract
The invention provides a descaling method for a long-distance high-concentration iron ore slurry conveying pipeline, and belongs to the field of metallurgical pipeline dredging. The descaling method comprises the steps that (1) the scaling status inside the pipeline is checked, and sampling is conducted for chemical laboratory analysis; (2) opening cutting inspection is conducted on the pipe section, 11.5 km away from a main pump station, of the pipeline, according to the scaling layer status, the total scaling amount is estimated, and the equivalent diameter of the pipeline is calculated; the main compositions of scale are analyzed, and the one-time descaling amount is determined; (3) a first pipe cleaner is selected for cleaning up the pipeline according to parameters obtained in the (1) step and the (2) step; a pipe cleaner sending device matched with the first pipe cleaner is used for sending the pipe cleaner into the pipeline, the pipe cleaner is sent from a pipeline inlet to a pipeline outlet and is received by a pipe cleaner receiving device, and meanwhile it is guaranteed that the pipe cleaner is not plugged in the pipeline inlet or the pipeline outlet; (4) more pipe cleaners are sequentially used for cleaning up the pipeline. The descaling method has the advantages that that production is not affected by the pipeline cleaning process, the pipeline is not damaged, the technology is safe and environmentally friendly, and operation is easy.
Description
Technical field
The invention belongs to long-distance slurry pipeline cleaning field, described long distance refers to that duct length is 102km.
Background technology
Taiyuan Iron and Steel Co. point mountain iron ore long-distance iron ore concentrate conveying pipeline be solid material long-distance transportation through pipeline technology at home metal mine use first, pipeline total length 102km, outer diameter tube Ф 243mm, wall thickness along the line is 12mm, 11.5mm, 9mm, 8mm, 11.5mm subsection gradual.During production run, inner-walls of duct fouling causes inner-walls of duct absolute roughness and main pump outlet pressure increase, when in pipeline, flow rate of pulp is close to critical flow velocity, and main pump outlet pressure is close to limiting value 153bar, conveying capacity declines to a great extent, pipeline cannot meet normal Production requirement, and it is dangerous to there is booster high-pressure leakage.
Current utilization pickling descaling, need system to stop for a long time to carry out, length consuming time, impact is produced, and the cleaning of dirty layer is not thorough, and repeatedly pickling is larger to pipeline body acid corrosion injury, waste liquid arranges difficulty outward, there is the risk that spent acid leaks, do not meet environmental requirement, the safe operation in a lower scope of main pump outlet pressure stability cannot be ensured.
Summary of the invention
The object of the present invention is to provide a kind of safety, environmental protection, neither affect production, do not damage again pipeline body at line length distance high concentration iron ore pulp delivery duct descaling method.
The present invention, by the pumped (conveying) medium of pipeline, promotes dissimilar, different size, the mechanical pipe-cleaner of band tracked instrument, covers the pipeline whole process that 102km many places along the line rise and fall smoothly.
Technical scheme of the present invention is:
1, to fouling condition inspection in pipeline and sample examination analysis
Main pumping station low-pressure area pipeline, higher-pressure region pipeline and terminal valving station pipeline scale situation are checked.And get detect endless tube exit, flowmeter inwall, main pump outlet valve inlet, main pump outlet valve export, end-filtration valving station flowmeter place get dirty sample, carries out assay.
Select pipeline section distance main pumping station 11.5km place to carry out scarfing inspection, according to layer of scale situation, estimate overall amount of scale buildup, calculate the equivalent diameter of pipeline; Analyze the Main Ingredients and Appearance of fouling, determine a snaking amount.
2, according to the design parameter of pipeline and the fouling condition of inside pipe wall, the equivalent diameter of estimation pipeline and amount of scale buildup, carry out hydraulic parameters tentative calculation to pipeline.
Residue bore formula: d "=D-2 (δ+t) (mm)=243-2 (δ+t) mm
In formula, d "-pipeline residue internal diameter; D-outer diameter tube; δ-pipeline average wall thickness; T-dirty layer average thickness
Pipeline internal medium velocity formula: V=Q/3600 × π × (d "/2)
2
In formula, the actual flow of the flow velocity Q-conduit running of V-pipeline internal medium
Amount of scale buildup computing formula: L × π in pipeline × ((d/2)
2-(d "/2)
2)
In formula, d-pipeline mean inside diameter; L-pipeline total length
New seamless pipe e=0.04 ~ 0.17mm; Filthy metal tube e=0.75 ~ 0.90mm.
3, according to step 1,2 Selecting parameter first wipers obtained, pipeline is removed
Wiper is sent in pipeline by the wiper dispensing device supporting by the first wiper, and wiper is sent by entrance, is received to pipe outlet by wiper receiving system, guarantees that wiper at entrance and outlet, blocking can not occur simultaneously.
4, the second wiper, the 3rd wiper, the 4th wiper, the 5th wiper, the 6th wiper, the 7th wiper, the 8th wiper is adopted to remove pipeline successively.
After concentrate pipeline adopts scale removal of the present invention, full packages slurry main pump outlet pressure drops to 75bar by 140bar, and pipeline pressure recovers normal, and pipe communication system ruuning situation is good.And can carry out pigging in time according to the pipeline pressure situation that fluctuates, repeatedly use and do not damage pipeline body, can arrange pigging at any time, implementation process does not affect production, pigging successful, ensure that pipe full packages slurry pressure stability is at 75 ~ 80bar.Productive power unit consumption drops to 3.75 kwh/t by 5.16kwh/t.
Detailed description of the invention
The present embodiment is Shanxi Taigang Stainless Steel Co., Ltd's point mountain iron ore long-distance iron ore concentrate conveying pipeline, and pipeline total length 102km, outer diameter tube Ф 243mm, thickness of pipe wall along the line is 12mm, 11.5mm, 9mm, 8mm, 11.5mm subsection gradual.Pumping plant departures circuit design is Φ 245 pipeline, wall thickness 14mm, design and installation high-pressure ball valve and carry the service cylinder of fast opening blind, and exports Φ 219 pipeline with pumping plant and be connected by skew T.The setting height(from bottom) of wiper service cylinder, at 0.8 ~ 1.3m, is the highlyest no more than 1.5m.
Pipe design enter terminal valving station before external diameter Φ 243mm, internal diameter Ф 220mm, entering valving station is Φ 243mm pipeline, wall thickness 11.5mm, and high-pressure ball valve is DN243 valve (internal diameter Φ 219mm).
Pipeline scale situation is: fouling layer thickness in pipeline top is 3 ~ 4mm; Pipeline two side layer of scale thickness is 5 ~ 6mm; Duct bottom does not have layer of scale, does not have the arc length of structure sheaf to be 195mm.
The determination of pipeline equivalent diameter:
According to the design parameter of pipeline and the fouling condition of inside pipe wall, the equivalent diameter of estimation pipeline and amount of scale buildup, carry out hydraulic parameters tentative calculation to pipeline.
Residue bore formula: d "=D-2 (δ+t) (mm)=243-2 (δ+t) mm
D "-pipeline residue internal diameter; D-outer diameter tube; δ-pipeline average wall thickness; T-dirty layer average thickness
Pipeline internal medium velocity formula: V=Q/3600 × π × (d "/2)
2
The actual flow of the flow velocity Q-conduit running of V-pipeline internal medium
Amount of scale buildup computing formula: L × π in pipeline × ((d/2)
2-(d "/2)
2)
D-pipeline mean inside diameter; L-pipeline total length
New seamless pipe e=0.04 ~ 0.17mm; Filthy metal tube e=0.75 ~ 0.90mm.
By calculating, the minimum equivalent diameter of pipeline is 212mm, and the Most Scale Creation of pipeline is 341.18m
3, the normal flow of Cemented filling medium is 5.38km/h (1.49m/s).
According to pipeline elevation data, there is low-lying place along the line in pipeline, and the fouling condition at low-lying place may be more serious, and the equivalent diameter of pipeline is estimated to be less than 212mm.
Send and receive wiper
Pumping plant outlet bore is all Φ 219mm, and internal diameter of the pipeline only has Φ 193 mm, is less than the calculating equivalent diameter of main pipeline, and main pipeline internal diameter along the line is Φ 243 mm pipeline, and mean inside diameter is Φ 225 mm, reaches 32mm with outlet difference;
On-the-spot pigging
1) on-the-spot successful implementation, has carried out three phases pigging engineering.First under the state of full packages water, send the handling capacity that pathfinder's wiper confirms pipeline; Band slurry sends pathfinder's wiper again, under the normal production status of pipeline, confirms the handling capacity of pipeline; Then, under the normal production status of pipeline, send wiper that is dissimilar, size successively, inserting tube, snaking carry out simultaneously.Often send a wiper, in time cleaning performance is assessed, determine transmission wiper type next time and size, both ensured a snaking amount, dirt amount can not be caused again to pile up blocking occurs, successively carry out fouling cleaning.The on-the-spot successfully wiper that transmission 6 kinds is dissimilar 14 times.
2) in wiper process of transmitting, calculate the wiper speed of service, utilize hand-held tracker to carry out along line following, wear Crossover phase emphasis and follow the tracks of, confirm wiper normal operation.
3), after pipeline scale is successfully cleared up, full packages slurry main pump outlet pressure drops to about 75bar by 130bar.
4) the on-the-spot model sending wiper be 1 respectively, external diameter Ф 214 mm light foam pig; 2, external diameter Ф 218 mm foam bristle pig; 3, the full polyurethane wiper of external diameter Ф 225 mm, band is followed the tracks of; 4, the full polyurethane wiper of external diameter Ф 220 mm; 5, first leather cup external diameter Ф 219 mm leather cup external diameter Ф 225 mm tetra-dish mechanical pipe-cleaner, thick 16mm, band gauging disc, external diameter Ф 197 mm; 6, leather cup external diameter Ф 225 mm tetra-dish mechanical pipe-cleaner, thick 16mm; 7, straight leather cup external diameter Ф 219 mm dish leather cup external diameter Ф 225 mm, the straight four dish mechanical pipe-cleaners of thick 16mm two;
8, leather cup external diameter Ф 225 mm tetra-dish mechanical pipe-cleaner, thick 16mm.
Claims (2)
1. long distance high concentration iron ore pulp delivery duct descaling method, comprises following content:
(1) to fouling condition inspection in pipeline and sample examination analysis:
Namely main pumping station low-pressure area pipeline, higher-pressure region pipeline and terminal valving station pipeline scale situation are checked; And get detect endless tube exit, flowmeter inwall, main pump outlet valve inlet, main pump outlet valve export, end-filtration valving station flowmeter place get dirty sample, carries out assay;
(2)select pipeline section distance main pumping station 11.5km place to carry out scarfing inspection, according to layer of scale situation, estimate overall amount of scale buildup, calculate the equivalent diameter of pipeline; Analyze the Main Ingredients and Appearance of fouling, determine a snaking amount;
(3)according to step 1,2 Selecting parameter first wipers obtained, pipeline is removed;
Wiper is sent in pipeline by the wiper dispensing device supporting by the first wiper, and wiper is sent by entrance, is received to pipe outlet by wiper receiving system, guarantees that wiper at entrance and outlet, blocking can not occur simultaneously;
(4)the second wiper, the 3rd wiper, the 4th wiper, the 5th wiper, the 6th wiper, the 7th wiper, the 8th wiper is adopted to remove pipeline successively.
2. long distance high concentration iron ore pulp delivery duct descaling method according to claim 1, is characterized in that amount of scale buildup computing formula: L × π in pipeline × ((d/2)
2-(d "/2)
2)
In formula, d-pipeline mean inside diameter; L-pipeline total length; D "-pipeline residue internal diameter;
Pipeline residue internal diameter formula: d "=D-2 (δ+t) (mm)=243-2 (δ+t) mm
In formula, d "-pipeline residue internal diameter; D-outer diameter tube; δ-pipeline average wall thickness; T-dirty layer average thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410013838.4A CN104772310A (en) | 2014-01-13 | 2014-01-13 | Descaling method for long-distance high-concentration iron ore slurry conveying pipeline |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410013838.4A CN104772310A (en) | 2014-01-13 | 2014-01-13 | Descaling method for long-distance high-concentration iron ore slurry conveying pipeline |
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|---|---|
| CN104772310A true CN104772310A (en) | 2015-07-15 |
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|---|---|---|---|
| CN201410013838.4A Pending CN104772310A (en) | 2014-01-13 | 2014-01-13 | Descaling method for long-distance high-concentration iron ore slurry conveying pipeline |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105170537A (en) * | 2015-07-17 | 2015-12-23 | 中国石油天然气股份有限公司 | Scale removing method for oil field three-phase separator and equipment of scale removing method |
| CN107354265A (en) * | 2017-09-15 | 2017-11-17 | 过柯丽 | Oxygen rifle slag cleaner |
| CN107557526A (en) * | 2017-09-15 | 2018-01-09 | 过柯丽 | Oxygen rifle removes slag method |
| CN110026395A (en) * | 2019-05-07 | 2019-07-19 | 港华燃气投资有限公司 | Old pipeline inner wall cleaning equipment and pigging method in old pipeline non-excavation rehabilitation |
| CN111014201A (en) * | 2019-12-10 | 2020-04-17 | 太原钢铁(集团)有限公司 | Descaling method for tailing rubber-lined pipeline |
| CN111322904A (en) * | 2019-12-30 | 2020-06-23 | 甘肃银光化学工业集团有限公司 | Optimization method for heat exchanger pickling process |
-
2014
- 2014-01-13 CN CN201410013838.4A patent/CN104772310A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105170537A (en) * | 2015-07-17 | 2015-12-23 | 中国石油天然气股份有限公司 | Scale removing method for oil field three-phase separator and equipment of scale removing method |
| CN105170537B (en) * | 2015-07-17 | 2018-06-01 | 中国石油天然气股份有限公司 | A kind of oil field three phase separator snaking method and its equipment |
| CN107354265A (en) * | 2017-09-15 | 2017-11-17 | 过柯丽 | Oxygen rifle slag cleaner |
| CN107557526A (en) * | 2017-09-15 | 2018-01-09 | 过柯丽 | Oxygen rifle removes slag method |
| CN107557526B (en) * | 2017-09-15 | 2019-03-22 | 过柯丽 | Oxygen rifle removes slag method |
| CN107354265B (en) * | 2017-09-15 | 2019-04-16 | 过柯丽 | Oxygen rifle steel slag cleaner |
| CN110026395A (en) * | 2019-05-07 | 2019-07-19 | 港华燃气投资有限公司 | Old pipeline inner wall cleaning equipment and pigging method in old pipeline non-excavation rehabilitation |
| CN111014201A (en) * | 2019-12-10 | 2020-04-17 | 太原钢铁(集团)有限公司 | Descaling method for tailing rubber-lined pipeline |
| CN111322904A (en) * | 2019-12-30 | 2020-06-23 | 甘肃银光化学工业集团有限公司 | Optimization method for heat exchanger pickling process |
| CN111322904B (en) * | 2019-12-30 | 2021-12-31 | 甘肃银光化学工业集团有限公司 | Optimization method for heat exchanger pickling process |
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Application publication date: 20150715 |
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