CN115127960A - Online rheological test method for pipeline transportation of all-solid waste paste slurry - Google Patents
Online rheological test method for pipeline transportation of all-solid waste paste slurry Download PDFInfo
- Publication number
- CN115127960A CN115127960A CN202210629246.XA CN202210629246A CN115127960A CN 115127960 A CN115127960 A CN 115127960A CN 202210629246 A CN202210629246 A CN 202210629246A CN 115127960 A CN115127960 A CN 115127960A
- Authority
- CN
- China
- Prior art keywords
- pipeline
- slurry
- pressure sensor
- solid waste
- full
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/02—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material
- G01N11/04—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Pipeline Systems (AREA)
Abstract
The invention provides an on-line rheological test method for pipeline transportation of full-solid waste paste slurry, and belongs to the technical field of mine filling pipeline transportation. Firstly, selecting a pressure sensor and a resistance tomography electrode sensor which have the same inner diameter as the measured pipeline, and sequentially connecting a pressure sensor I, the electrode sensor and a pressure sensor II to the measured area of the slurry pipeline along the slurry flowing direction; when the slurry stably flows in the tested pipeline, measuring and recording the pressure intensity in the pipeline and the slurry flow velocity distribution curve, and obtaining a shear stress distribution expression of any point on the cross section of the pipeline; further obtaining a slurry flow velocity distribution expression; calculating to obtain a shear rate distribution expression of any point on the cross section of the pipeline; finally, obtaining a rheological model of the full-solid waste paste in a pipeline conveying flowing state. The method is beneficial to breaking through the limitation of the traditional model and constructing the full-solid waste paste slurry pipe-conveying rheological model which is more accurate and considers the shearing history.
Description
Technical Field
The invention relates to the technical field of mine filling pipeline transportation, in particular to an online rheological test method for pipeline transportation of full-solid waste paste slurry.
Background
The method is characterized in that the total solid waste (including waste rocks, tailings, furnace slag and the like) generated in the development process of mineral resources accounts for more than 75% of the large-volume industrial solid waste, the filling of the total solid waste paste is to prepare the total solid waste accumulated on the surface into paste-like and non-bleeding slurry and convey the slurry to an underground goaf through a pipeline, and the technology is a powerful technical means for cooperatively treating two pollution sources and dangerous sources of the total solid waste and the goaf and realizing green mining of mines.
Pipeline transportation is a key link of mine filling, pipe network design and pipeline transportation resistance calculation are closely related to slurry rheological parameters, and accurate measurement of the rheological parameters and scientific construction of a rheological model are important subjects in the field of pipeline transportation research. At present, the commonly used rheological test methods are divided into two categories, one is that rheological parameters of slurry are directly measured by using viscosimeters or rheometers of different types such as capillary tubes and coaxial cylinders, and the other is that rheological parameters are indirectly obtained through slump tests, L-tube tests, ring tube tests and the like. However, the traditional rheometer has poor adaptability to coarse particles, and is difficult to accurately measure the full-solid waste paste slurry with particle size over multiple orders of magnitude (the waste stone and the slag belong to centimeter level, and the tailings belong to millimeter level or even hundred nanometers level); rheological parameters obtained by experiments such as L-shaped pipes and slump are influenced by manual operation, so that the conditions of large errors and nonuniform results are easy to occur. More importantly, the measurement schemes are all offline tests, the influence of the flow shear of the pipe conveying on the rheological property of the slurry is not considered, and the reference value of the measurement result on the actual engineering design is relatively limited.
Therefore, an online rheological test method for pipeline transportation is urgently needed, rheological parameters of all-solid waste paste slurry in a pipeline transportation flowing state are obtained in real time, accurate prediction of all-solid waste paste pipeline transportation resistance is facilitated, a theoretical basis is provided for engineering design and system maintenance of paste pipeline transportation, and application and popularization of the all-solid waste paste technology are promoted.
Disclosure of Invention
The invention aims to provide an on-line rheological test method for pipeline transportation of all-solid waste paste slurry.
The test method comprises the following steps:
s1: selecting a pressure sensor and a resistance tomography electrode sensor which have the same size according to the inner diameter of the slurry pipeline to be detected, and sequentially connecting the pressure sensor I, the electrode sensor II and the pressure sensor II to the detected area of the slurry pipeline along the slurry flowing direction;
s2: when the slurry continuously flows in the measured slurry pipeline in a full pipe and stably flows, respectively measuring and recording the pressure intensity in the pipe and the flow velocity distribution curve of the slurry, and acquiring the distribution expression tau of the shear stress tau of any point on the cross section of the pipeline, which is at the distance r from the axis of the pipeline, wherein the distribution expression tau is f (r);
s3: fitting the slurry flow velocity distribution curve by using an N-order polynomial, determining the polynomial order N under the optimal fitting effect through a coefficient, and obtaining the distribution expression u of the slurry flow velocity u of any point, the distance of which is r from the axis of the pipeline, on the cross section of the pipeline;
s4: carrying out first-order derivation on u-g (r) to obtain the shear rate of any point on the cross section of the pipeline
Distribution expression of
S5: simultaneous τ ═ f (r) and
obtaining a rheological model of the full solid waste paste in a pipeline conveying flowing state
The device applied by the method comprises a resistance tomography system, a pressure sensor I, a pressure sensor II, a common data acquisition unit and a main control computer,
the resistance tomography system comprises an electrode sensor and a data acquisition unit special for resistance tomography,
the pressure sensor I, the electrode sensor and the pressure sensor II are connected through flanges in sequence and then are connected into a measured area of the slurry pipeline through the flanges;
signals of the electrode sensor are transmitted to the special resistance tomography data acquisition unit, signals of the pressure sensor I and the pressure sensor II are transmitted to the common data acquisition unit, and information of the special resistance tomography data acquisition unit and the common data acquisition unit is transmitted to the main control computer.
The slurry in the slurry pipeline is full solid waste paste slurry, and the full solid waste comprises one or more of full tailings, graded tailings, waste stone, furnace slag, coal gangue and red mud.
The electrode sensor is provided with two electrode planes along the axial direction of the slurry pipeline and is used for measuring the slurry flow velocity distribution curve on the cross section of the pipeline.
The calculation process in S2 above is as follows:
wherein, P 1 、P 2 The pressure values measured by the first pressure sensor and the second pressure sensor are respectively, and L is the distance between the first pressure sensor and the second pressure sensor.
In S3, EXCEL or Origin software fitting is specifically adopted, and since the closer the coefficient of decision is to 1, the better the fitting effect, the order N of the polynomial is determined by the coefficient of decision.
The technical scheme of the invention has the following beneficial effects:
compared with the existing viscometer or rheometer, the filling slurry with complicated particle size composition and multiple orders of magnitude of particle size can be better adapted by the scheme, and the device applied by the method has the advantages of simple structure, convenient manufacture and flexible installation and disassembly during use. In addition, the traditional rheological model (such as a Bingham model, a power law model, a Herschel-Bulkley model and the like) does not consider the influence of time, and the method can realize the real-time measurement of the rheological parameters of the slurry under the action of flow shearing of the pipe flow under the condition of not interfering the flow of the slurry in the pipe, is favorable for breaking through the limitation of the traditional model, and constructs the pipe flow rheological model of the all-solid waste paste, which is more accurate and considers the shearing history and even the temperature effect.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus applied in the method for pipeline transportation of the full-solid waste paste slurry for on-line rheological test of the invention;
FIG. 2 is a plot of velocity profile test scatter and a fitted curve thereof measured across a cross-section of a pipe in an embodiment of the present invention;
wherein: 1-electrical resistance tomography system; 2-a first pressure sensor; 3-a second pressure sensor; 4-a common data collector; 5-a main control computer; 6-a flange; 101-electrode sensors; 102-resistance tomography exclusive data acquisition unit.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides an on-line rheological test method for pipeline transportation of full-solid waste paste slurry.
As shown in FIG. 1, the device used in the method comprises a resistance tomography system 1, a pressure sensor I2, a pressure sensor II 3, a common data collector 4 and a main control computer 5,
the electrical resistance tomography system 1 comprises an electrode sensor 101 and an electrical resistance tomography-specific data collector 102,
the pressure sensor I2, the electrode sensor 101 and the pressure sensor II 3 are sequentially connected through the flange 6 along the slurry flowing direction and then connected into a slurry pipeline through the flange;
signals of the electrode sensor 101 are transmitted to the special data collector 102 for resistance tomography, signals of the pressure sensor I2 and the pressure sensor II 3 are transmitted to the common data collector 4, and information of the special data collector 102 for resistance tomography and information of the common data collector 4 are transmitted to the main control computer 5.
The test method comprises the following steps:
s1: selecting a pressure sensor and a resistance tomography electrode sensor which have the same size according to the inner diameter of the slurry pipeline to be detected, and sequentially connecting a pressure sensor I2, an electrode sensor 101 and a pressure sensor II 3 to the detected area of the slurry pipeline along the slurry flowing direction;
s2: when the slurry continuously flows in the measured slurry pipeline in a full pipe and stably flows, respectively measuring and recording the pressure intensity in the pipe and the flow velocity distribution curve of the slurry, and acquiring the distribution expression tau of the shear stress tau of any point on the cross section of the pipeline, which is at the distance r from the axis of the pipeline, wherein the distribution expression tau is f (r);
s3: fitting the slurry flow velocity distribution curve by using an N-order polynomial, determining the polynomial order N under the optimal fitting effect through a coefficient, and obtaining the distribution expression u of the slurry flow velocity u of any point, the distance of which is r from the axis of the pipeline, on the cross section of the pipeline;
s4: carrying out first-order derivation on u-g (r) to obtain a distribution expression of the shear rate of any point on the cross section of the pipeline
S5: simultaneous τ ═ f (r) and
obtaining a rheological model of the full solid waste paste in a pipeline conveying flowing state
The following description is given with reference to specific examples.
In order to test the rheological parameters of the full-solid waste paste slurry with 80% mass concentration of a certain metal ore flowing in a vertical pipeline with the internal diameter of 65mm in a full pipe, the following steps are required:
step 1: according to the inner diameter of a measured pipeline, a UPVC pipeline with the length of 24cm, the inner diameter of 65mm and the wall thickness of 5mm is selected to manufacture an electrode sensor of a resistance tomography system, the central section of the pipeline is taken as a symmetrical plane, an electrode plane is respectively arranged on the left side and the right side, the distance between each electrode plane and the central section of the pipeline is 4cm, and the electrode plane is composed of sixteen stainless steel electrodes which are uniformly distributed along the pipe wall. Flanges with the inner diameter of 65mm are respectively connected with the first pressure sensor 2, the electrode sensor 101 and the second pressure sensor 3, the assembled rheological testing device is installed in a tested area of a vertical pipeline, and the distance L between the first pressure sensor 2 and the second pressure sensor 3 is measured to be 42 cm.
Step 2: when the slurry continuously flows in the tested pipeline in a full pipe and stably, the computer records the measurement data of all the sensors in real time.
Selecting data at a certain moment in the test process, and measuring value P of a pressure sensor 2 1 9867Pa, measured value P of two pressure sensors 3 2 Calculating a shear stress distribution expression of any point (the distance from the axis of the pipeline is r) on the cross section of the pipeline as 9060Pa
Acquiring a slurry flow velocity distribution test scatter diagram by using the electrical resistance tomography system 1, as shown in fig. 2;
and step 3: from the coefficient of solution, the sixth order polynomial fits the scatter points with the best effect. Using a six-order polynomial y ═ A 0 +A 1 x+A 2 x 2 +A 3 x 3 +A 4 x 4 +A 5 x 5 +A 6 x 6 Fitting the slurry flow velocity distribution test scattering points (wherein x is r/D, and D is 65mm), wherein the coefficients in the front of each single term in the fitting equation are respectively: a. the 0 ＝0.96，A 1 ＝6.67×10 -16 ，A 2 ＝-7.87，A 3 ＝-2.07×10 -14 ，A 4 ＝24.57，A 5 ＝8.92×10 -14 ，A 6 -18.08. Due to A 1 、A 3 And A 5 Very small, to simplify the calculation, A 1 、A 3 And A 5 Considering it as equal to 0, we obtain the expression for the flow velocity distribution of the slurry at any point on the cross section of the pipe (distance r from the axis of the pipe):
and 4, step 4: to ensure that the shear rate is constant at a positive value, first-order derivation is carried out on u ═ g (r) and an absolute value is taken, so that a shear-rate distribution expression of any point (the distance from the pipeline axis is r) on the pipeline cross section is obtained:
and 5: simultaneous τ ═ f (r) and
obtaining a rheological model of the all-solid waste paste in a state of tube flow
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. An on-line rheological test method for pipeline transportation of all-solid waste paste slurry is characterized by comprising the following steps:
s1: selecting a pressure sensor and a resistance tomography electrode sensor which have the same size according to the inner diameter of the slurry pipeline to be detected, and sequentially connecting the pressure sensor I, the electrode sensor II and the pressure sensor II to the detected area of the slurry pipeline along the slurry flowing direction;
s2: when the slurry continuously flows, is full of the pipeline and stably flows in the tested pipeline, respectively measuring and recording the pressure intensity in the pipeline and the flow velocity distribution curve of the slurry, and acquiring the distribution expression tau of the shear stress tau of any point on the cross section of the pipeline, which is at the distance r from the axis of the pipeline, which is f (r);
s3: fitting the slurry flow velocity distribution curve by using an N-order polynomial, determining the polynomial order N under the optimal fitting effect through a coefficient, and obtaining the distribution expression u of the slurry flow velocity u of any point, the distance of which is r from the axis of the pipeline, on the cross section of the pipeline;
s4: carrying out first-order derivation on u-g (r) to obtain the shear rate of any point on the cross section of the pipeline
Distribution expression of
S5: simultaneous τ ═ f (r) and
obtaining a rheological model of the full solid waste paste in a pipeline conveying flowing state
2. The on-line rheology test method for pipeline transportation of full-solid waste paste slurry according to claim 1, characterized in that the devices applied by the method comprise a resistance tomography system, a pressure sensor I, a pressure sensor II, a common data collector and a main control computer,
the electrical resistance tomography system comprises an electrode sensor and a data acquisition unit special for electrical resistance tomography,
the pressure sensor I, the electrode sensor and the pressure sensor II are connected through flanges in sequence and then are connected into a measured area of the slurry pipeline through the flanges;
signals of the electrode sensor are transmitted to the special resistance tomography data acquisition unit, signals of the pressure sensor I and the pressure sensor II are transmitted to the common data acquisition unit, and information of the special resistance tomography data acquisition unit and the common data acquisition unit is transmitted to the main control computer.
3. The pipeline transportation online rheology test method of the full solid waste paste slurry according to claim 1, characterized in that the slurry in the slurry pipeline is full solid waste paste slurry, and the full solid waste comprises one or more of full tailings, graded tailings, waste stones, slag, coal gangue and red mud.
4. The method for the pipeline transportation of the all-solid waste paste slurry according to claim 2, wherein the electrode sensor is provided with two electrode planes along the axial direction of the slurry pipeline, and is used for measuring the slurry flow velocity distribution curve on the cross section of the pipeline.
5. The pipeline transportation online rheology test method for full solid waste paste slurry according to claim 1, characterized in that the calculation process in S2 is as follows:
wherein, P 1 、P 2 The pressure values measured by the first pressure sensor and the second pressure sensor are measured respectively, and L is the distance between the first pressure sensor and the second pressure sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210629246.XA CN115127960B (en) | 2022-06-01 | 2022-06-01 | Online rheological test method for pipeline transportation of all-solid waste paste slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210629246.XA CN115127960B (en) | 2022-06-01 | 2022-06-01 | Online rheological test method for pipeline transportation of all-solid waste paste slurry |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115127960A true CN115127960A (en) | 2022-09-30 |
| CN115127960B CN115127960B (en) | 2023-03-28 |
Family
ID=83377308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210629246.XA Active CN115127960B (en) | 2022-06-01 | 2022-06-01 | Online rheological test method for pipeline transportation of all-solid waste paste slurry |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115127960B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117969347A (en) * | 2024-01-11 | 2024-05-03 | 北京科技大学 | Filling slurry rheological test device and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389259A (en) * | 2013-07-23 | 2013-11-13 | 北京科技大学 | Pasty fluid filling slurry rheology characteristic testing system and application method thereof |
| CN111379588A (en) * | 2020-04-10 | 2020-07-07 | 昆明理工大学 | Mine filling slurry sedimentation segregation control system and method based on low-frequency pulse |
| CN113624765A (en) * | 2021-07-08 | 2021-11-09 | 北京科技大学 | Visual monitoring experiment device for filling slurry pipeline transportation and use method |
-
2022
- 2022-06-01 CN CN202210629246.XA patent/CN115127960B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389259A (en) * | 2013-07-23 | 2013-11-13 | 北京科技大学 | Pasty fluid filling slurry rheology characteristic testing system and application method thereof |
| CN111379588A (en) * | 2020-04-10 | 2020-07-07 | 昆明理工大学 | Mine filling slurry sedimentation segregation control system and method based on low-frequency pulse |
| CN113624765A (en) * | 2021-07-08 | 2021-11-09 | 北京科技大学 | Visual monitoring experiment device for filling slurry pipeline transportation and use method |
Non-Patent Citations (3)
| Title |
|---|
| JIAJUN GAO,ET AL.: "Hydromechanics-based flow velocity estimation using single ERT sensor" * |
| 刘晓辉，等: "浓密尾矿管道输送的研究现状及展望" * |
| 刘晓辉,等: "膏体尾矿管内滑移流动阻力特性及其 近似计算方法" * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117969347A (en) * | 2024-01-11 | 2024-05-03 | 北京科技大学 | Filling slurry rheological test device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115127960B (en) | 2023-03-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103389259B (en) | A set of paste body filling slip rheological characteristics test macro and using method thereof | |
| CN115127960B (en) | Online rheological test method for pipeline transportation of all-solid waste paste slurry | |
| CN109061101B (en) | Soft measuring device and method for underflow concentration, mud layer height and internal ore amount of thickener | |
| Yang et al. | Determining the pressure drop of cemented Gobi sand and tailings paste backfill in a pipe flow | |
| CN104863581A (en) | Circumferential conductance probe sensor and system for measuring dynamic full water value of horizontal well | |
| Creber et al. | Investigation into changes in pastefill properties during pipeline transport | |
| CN109101767B (en) | Pipeline conveying resistance loss calculation method for paste filling slurry based on T-H coupling | |
| CN112325956A (en) | Induction type high-temperature gas-solid two-phase flow measuring instrument and measuring method thereof | |
| CN109732782A (en) | A kind of concrete moisture content online monitoring system and monitoring method | |
| CN101539016A (en) | Method for measuring gas-liquid multiphase flow rate by utilizing thermal diffusion and device | |
| CN109298025B (en) | Test device and method for monitoring segregation of paste filling slurry in pipeline | |
| CN114818329A (en) | Method for obtaining rheological parameter correction coefficient of filling pipeline simulation model | |
| CN103472204A (en) | Method for detecting ash content of floatation products | |
| Xue et al. | Wall slip behavior of cemented paste backfill slurry during pipeline based on noncontact experimental detection | |
| CN104267211A (en) | Portable device for online measurement of flowing speed, concentration, flowing speed distribution and concentration distribution of powder | |
| CN105239995B (en) | Three-electrode potential difference type detection method for coating in underground oil casing | |
| CN205483932U (en) | Laboratory slurry pipeline concentration distribution measurement device | |
| Wu et al. | An experimental device for calibration of concentration and velocity of two-phase flow based on electrical impedance measurement system | |
| CN115034477A (en) | Economic operation analysis system and optimization method for slurry pipeline | |
| Feng et al. | Influence of urban rail transit on corrosion of buried steel GAS pipeline | |
| Lv et al. | Online analysis of coal slime water particle size based on RRSB characteristic parameters | |
| CN213898946U (en) | Current collector dynamic calibration device for cable logging | |
| CN112343573A (en) | Method for predicting yield of condensate gas well | |
| CN214539617U (en) | A stationary flow structure for concentration measurement instrument | |
| Cao et al. | Online measurement of particle size distribution in alumina with Electrical Sensing Zone method in Bayer Process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |