CN211877680U - Device for detecting rheological property of coal slurry based on safety ring pipe - Google Patents
Device for detecting rheological property of coal slurry based on safety ring pipe Download PDFInfo
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- CN211877680U CN211877680U CN201922465306.5U CN201922465306U CN211877680U CN 211877680 U CN211877680 U CN 211877680U CN 201922465306 U CN201922465306 U CN 201922465306U CN 211877680 U CN211877680 U CN 211877680U
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Abstract
The utility model discloses a device for detecting rheological property of coal slurry based on a safety ring pipe, which comprises a slurry storage tank, wherein a stirrer is arranged in the slurry storage tank; the slurry storage tank is connected with the slurry feeding pump through a pipeline; the slurry feeding pump is connected with one end of the safety ring pipe; the other end of the safety ring pipe is communicated with the slurry storage tank; the local part of the safety ring pipe is a bent pipe; the bent pipe is connected with an abrasion short pipe along the flowing direction of the coal slurry. The utility model discloses with actual pipeline with the specification, be equipped with multiple detection instrument and device, can do circulation industrialization coal slurry rheological behavior detection experiment, also can do and get into the coal slurry safety characteristic before the actual transportation of main line and detect.
Description
Technical Field
The utility model belongs to the technical field of the defeated coal of pipeline, concretely relates to device based on safe ring canal detects slurry rheological property.
Background
The large-diameter long-distance pipeline transportation of the slurry becomes the fifth transportation mode after the current railway, road, air transportation and shipping, has the advantages of being green, energy-saving, high-energy, suitable for complex terrain and the like, but the research on the large-diameter long-distance pipeline transportation method is always in the pipeline laboratory stage with the reduced pipe diameter and length, the state of the slurry in actual transportation is inferred by using numerical simulation, theoretical formulas, empirical parameters and the like, and the method has the limitation of being separated from the reality. The device has the characteristics of having the same specification with an actual pipeline, being provided with various detecting instruments and equipment, and being capable of connecting a ring pipe with a storage tank for circulation and also being connected with a main pipeline for actual conveying; the actual pipeline conveying state and data detection can be carried out to guide the pulping process; the actual abrasion condition of the inner wall of the pipeline can be observed; and a small amount of coal slurry can be used for carrying out a circulation test, and the rheological property of the coal slurry can be detected before actual conveying, so that the coal slurry enters the main pipeline after the parameters of the coal slurry are qualified, and the safe operation of the main pipeline is ensured.
Poplar, strength, wanyongming, graceful, Chenzhongjie, waste stone and tailings mixed slurry pipeline transport pressure loss loop test [ J ], proceedings of combined fertilizer industry university, 2017, 40 (8): 1093-.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a device based on safety ring canal detects slurry rheological property, with actual pipeline with the specification, be equipped with multiple detection instrument and device, can do circulation industrialization slurry rheological property detection experiment, also can do the slurry safety characteristic before getting into the actual transportation of main line and detect.
The utility model adopts the technical proposal that the device for detecting the rheological property of the coal slurry based on the safety ring pipe comprises a slurry storage tank, wherein a stirrer is arranged in the slurry storage tank; the slurry storage tank is connected with the slurry feeding pump through a pipeline; the slurry feeding pump is connected with one end of the safety ring pipe; the other end of the safety ring pipe is communicated with the slurry storage tank; the local part of the safety ring pipe is a bent pipe; the bent pipe is connected with an abrasion short pipe along the flowing direction of the coal slurry;
a differential pressure transmitter a and upper, middle and lower sampling points a are arranged at the inlet of the safety ring pipe; the horizontal straight pipe part of the safety ring pipe is provided with a PH meter, a temperature transmitter, an electromagnetic flowmeter and a densimeter; a pressure difference transmitter b and upper, middle and lower sampling points b are arranged at the outlet of the safety ring pipe; wherein the electromagnetic flow meter is located upstream of the densitometer.
The utility model discloses a characteristics still lie in:
the specification of the safety ring pipe is consistent with that of a main trunk line of an actual conveying pipeline, the outer diameter is 559-610 mm, the wall thickness is 9-17.5 mm, the roughness is 0.2-0.3 mm, and the length is 250-300 m;
the horizontal laying angle of the safety ring pipe is 0 degree.
The length of the abrasion short pipe is 0.8-1.2 m.
The bending radius of the bent pipe is 4-6D, and D is the outer diameter of the safety ring pipe.
The concrete specification of the pulp storage tank is as follows: phi 19 x 23m, effective volume 5000m3Storing coal slurry 1700m3。
The concrete specification of the slurry feeding pump is as follows: metso H3010 x 8 variable frequency centrifugal slurry pump with 70m of lift and 980m of rated flow3/h。
The utility model has the advantages that:
the utility model relates to a device for detecting rheological property of coal slurry based on a safety ring pipe, which is used for detecting rheological property of coal slurry, 1, the specification of the device is the same as that of an actual transportation pipeline main line, and the device can detect the actual pipeline flow state property; 2. the upper sampling point, the middle sampling point and the lower sampling point are respectively arranged at the feeding and discharging port of the circular pipe, so that the rheological characteristics of the coal slurry before and after the circular pipe operates can be compared, the change of the coal slurry in the circular pipe operation can be more obviously obtained, and the effective guidance is provided for the pulping process; 3. a section of detachable abrasion short pipe is connected to the bent pipe along the coal flow direction, and can be detached after running for a period of time, and the actual abrasion condition of the weighing detection pipeline is observed; 4. the coal slurry circulation pipeline can be used as a circulation pipeline for detecting the coal slurry characteristics, the coal slurry consumption is saved, the coal slurry circulation pipeline can also be used as a safety pipeline for detecting the rheological characteristics of the coal slurry before actual pipeline transportation, and the coal slurry enters a main pipeline after the coal slurry parameters are qualified, so that the safe operation of the main pipeline is ensured.
Drawings
FIG. 1 is a schematic connection diagram of the device for detecting rheological property of coal slurry based on a safety ring pipe;
fig. 2 is a schematic connection diagram of an embodiment of the device for detecting rheological properties of coal slurry based on a safety loop of the present invention.
In the figure, 1 is a slurry storage tank, 2 is a stirrer, 3 is a slurry feeding pump, 4 is a safety ring pipe, 5 is a bent pipe, 6 is an abrasion short pipe, 7 is a differential pressure transmitter a, 8 is a differential pressure transmitter a, 9 is a PH meter, 10 is a temperature transmitter, 11 is an electromagnetic flowmeter, 12 is a densimeter, 13 is an upper sampling point, a middle sampling point and a lower sampling point b, 14 is a differential pressure transmitter b.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in figure 1, the device for detecting the rheological property of the coal slurry based on the safety ring pipe comprises a slurry storage tank 1, wherein a stirrer 2 is arranged in the slurry storage tank 1; the pulp storage tank 1 is connected with the pulp feeding pump 3 through a pipeline; the slurry feeding pump 3 is connected with one end of the safety ring pipe 4; the other end of the safety ring pipe 4 is communicated with the slurry storage tank 1; the safety ring pipe 4 is partially provided with a bent pipe 5; the elbow pipe 5 is connected with an abrasion short pipe 6 along the flowing direction of the coal slurry;
a differential pressure transmitter a7 and upper, middle and lower sampling points a8 are arranged at the inlet of the safety ring pipe 4; the horizontal straight pipe part of the safety ring pipe 4 is provided with a PH meter 9, a temperature transmitter 10, an electromagnetic flowmeter 11 and a densimeter 12; a pressure difference transmitter b14 and upper, middle and lower sampling points b13 are arranged at the outlet of the safety ring pipe 4; wherein the electromagnetic flow meter 11 is located upstream of the densitometer 12.
The specification of the safety ring pipe 4 is consistent with that of a main trunk line of an actual conveying pipeline, the outer diameter is 559-610 mm, the wall thickness is 9-17.5 mm, the roughness is 0.2-0.3 mm, and the length is 250-300 m;
the horizontal laying angle of the safety collar 4 is 0 °.
The length of the abrasion short pipe 6 is 0.8-1.2 m.
The bending radius of the bent pipe 5 is 4-6D, and D is the outer diameter of the safety ring pipe 4.
Concrete of the slurry storage tank 1The specification is as follows: phi 19 x 23m, effective volume 5000m3Storing coal slurry 1700m3。
The concrete specification of the slurry feeding pump 3 is as follows: metso H3010 x 8 variable frequency centrifugal slurry pump with 70m of lift and 980m of rated flow3/h。
The method for detecting rheological property of coal slurry based on the safety ring pipe is implemented according to the following steps:
the calculation formula for the design flow rate V is as follows:
in the formula, QarThe amount of the base coal is transmitted and received for the pipe, t/a; mtIs the total water content of the coal,%; t is annual working time h; d is the outer diameter of the pipeline, mm; t is the average wall thickness of the pipeline, mm; cwThe weight concentration of the coal slurry; rhosIs the density of the coal slurry, t/m3；
Hourly pipeline throughput QsThe calculation formula is as follows:
Qs＝0.785×3600×10-6×V×(D-2t)2(2)
in the formula, V is the designed flow speed of the pipeline, m/s; d is the outer diameter of the pipeline, mm; t is the average wall thickness of the pipe, mm.
4, performing a safe ring pipe operation test of coal slurry with different concentrations under different flow rates; wherein the test concentration is from high to low; after each high-concentration test is finished, diluting the coal slurry through secondary pulping and water to obtain the coal slurry with the concentration required by the next test;
the safety ring pipe operation test comprises the following specific processes:
the method comprises the steps that the pressure difference of coal slurry is detected on the safety ring pipe 4 on line through a pressure difference transmitter a7 and a pressure difference transmitter b14, the pH of the coal slurry is detected on line through a pH meter 9, the temperature of the coal slurry is detected on line through a temperature transmitter 10, the flow of the coal slurry is detected on line through a magnetic flowmeter 11, and the density of the coal slurry is detected on line through a densimeter 12;
sampling at an upper, middle and lower sampling point a8 and an upper, middle and lower sampling point b13 of the safety ring pipe 4, and detecting the penetration weight, the particle size grading, the viscosity, the pH, the concentration, the rheological property and the vertical sedimentation property of the coal slurry;
wherein, the rheological property is measured by a Mettler RM180, 12 system;
the specific calculation process is as follows:
(1) the calculation process of the hydraulic gradient is as follows:
according to the principle of minimum angle laying pipeline, namely the pipeline laying angle gamma is smaller than the minimum value of the repose angle alpha and the slip angle beta, converting the angle into the gradient: gamma% ═ tan (alpha, beta)minThe maximum laying gradient of the circular pipe is-gamma%, and the hydraulic gradient design value of the coal slurry is gamma%;
(2) the minimum wall thickness t of the pipe is calculated as follows:
in the formula, P is the design pressure of the pipeline, MPa; d is the outer diameter of the pipeline, mm; k is a design coefficient, 0.72 is taken in a general area, and 0.6 is taken in suburbs and stations in cities and towns;
the weld coefficient of the pipe is; sigmasThe minimum yield hardness of the pipe is MPa; c is the abrasion loss of 30 years, 0.05 mm/a;
(3) the calculation process of the pipe wall roughness is as follows:
calculating the roughness of the pipe wall by adopting a Kerbulruk formula and a Modi formula, and if the roughness calculated by the two formulas is consistent, calculating correctly; otherwise, the Reynolds coefficient Re or the friction factor lambda of the fluid is unreasonable;
the Kerbulke formula is as follows:
in the formula, delta is absolute roughness of the pipeline, and is 0.26006 mm; d is the outer diameter of the pipeline, mm; λ is friction factor, λ ═ 0.03; re is the Reynolds number of the fluid and is 4000-108，Δ/D＝3×10-3～10-5In all cases from hydraulically smooth pipes to completely rough pipes, the fluid in the safety ring pipe is in a turbulent state, and Re is 12500;
the Modi formula is as follows:
in the formula, delta is absolute roughness of the pipeline, and is 0.22677 mm; d is the outer diameter of the pipeline, mm; λ is friction factor, λ ═ 0.03; re is the Reynolds number of the fluid,
(4) the calculation process of the pipeline on-way loss comprises the following steps:
calculating the on-way drag loss h by using Darcy-Weisbach equation and Bernoulli equationfIf the calculated values of the two equations are consistent, the calculation is correct, otherwise, the test detection value or the friction factor lambda value is wrong, and the measurement needs to be carried out again;
the darcy-weisbach formula is as follows:
wherein L is the length of the tube, m; d is the diameter of the pipe, mm; λ is an on-way resistance coefficient, and is dimensionless, and λ is 0.03; v is the average of the slurryAverage flow velocity, m/s; g is the acceleration of gravity, m/s2；
The bernoulli equation is as follows:
in the formula, z1、z2The water head is the front and back water heads of a section of coal slurry pipeline; p1、P2The pressure, Pa, of the front and the back of a section of coal slurry pipeline respectively; rho is coal slurry concentration, g/cm3(ii) a g is the acceleration of gravity, m/s2；v1、v2The flow velocity of the coal slurry before and after a section of pipeline is m/s;
(5) the lowest safe flow rate is C/CaFlow rates corresponding to > 0.8.
the standard is as follows:
(1) the criteria for hydraulic slope are: the hydraulic gradient is smaller than the minimum value of the repose angle alpha and the slip angle beta, namely the maximum laying angle gamma of the ring pipe is smaller than the hydraulic gradient;
(2) the minimum wall thickness t of the pipe is as follows: the pressure bearing capacity of the minimum wall thickness part of the pipeline is greater than the maximum pressure of the coal slurry in the pipeline during conveying and greater than the maximum abrasion loss of the pipeline within the design life of 30 years;
(3) the criteria for tube wall roughness are: judging the inner wall rusting condition according to the calculated value of the absolute roughness of the inner wall of the safety ring pipe;
(4) the criteria for loss along the way are: when the on-way loss of the ring pipe is less than the actual friction loss of the main pipeline, the calculated value is in accordance with the standard; otherwise, indicating that the friction factor lambda value or the average flow velocity v of the fluid is wrong, and needing to be re-valued and calculated;
(5) the minimum safe flow rate criteria are: the safe flow rate is the lowest safe flow rate plus 0.2-0.3 m/s; the designed flow rate is equal to the safe flow rate multiplied by 1.1; comparing whether the minimum safe flow rate calculated according to the design flow is consistent with the minimum safe flow rate tested by the test, if so, indicating that the design flow rate is consistent with the standard, and if not, taking the actual operation minimum safe flow rate as the standard;
(6) degree of homogeneity C/CaThe standard of (2) is: C/CaIf the coal slurry is more than 0.8, the stability of the coal slurry in the pipeline is good, and the coal slurry meets the safe operation standard of pipeline slurry transportation.
And 8, after the test is finished, replacing the coal slurry in the pipeline by using water to prevent the coal slurry from precipitating in the equipment and the pipeline.
Examples
First, experiment simulation object
The Shenwei coal conveying pipeline has the design annual conveying capacity of 1000 million tons of clean coal, the granularity of-1.2 mm, the conveying concentration of 51-55 percent and the full length of 727km, and 5 booster pump stations and terminal stations are arranged along the pipeline. The Shenmu station is a No. 1 pump station and is provided with 4 effective volumes of 5000m3The slurry storage tank, 4 replacement water pumps, 3 slurry feeding pumps and 6 main pumps (diaphragm pumps), wherein 2-5# is an intermediate pressurizing station and is provided with 1 effective volume of 2000m3Buffer tank, 4 replacement water pumps, 3 slurry feeding pumps and 6 main pumps, and the terminal receiving station is the pu cheng station, comprises energy dissipation station and jar district. The energy dissipation station is provided with 5 adjustable energy dissipation ring pipes, and the tank area consists of 15 effective volumes of 8600m3The slurry storage tank.
The outer diameter of most of the pipeline is 610mm, and 559mm is adopted for the outer diameter of 7km upstream of a 3# mountain cleaning station and 86km upstream of an energy dissipation station. The full line pipe wall thickness varies from the thinnest 10.3mm to the thickest 17.5 mm. In addition, the pipeline system is also provided with a safety protection system which comprises an expert alarm system, energy dissipation pore plate combination adjustment and main pump automatic deceleration.
Second, parameters of the safety ring pipe adopted in the experiment
The device for detecting the rheological property of the coal slurry based on the safe ring pipe is adopted to carry out a safe ring pipe experiment; the outer diameter and the material of the safety ring pipe selected in the experiment are consistent with those of the main pipeline, and the wall thickness of the safety ring pipe is the thinnest wall thickness (10.3mm) in the main pipeline; namely the safety collar: the length is 280m (the distance between the differential pressure sensors is 270m), the outer diameter is 610mm, the wall thickness is 10.3mm, and the inner diameter is 589 mm; through the safety ring pipe test, the operation parameters of the coal slurry in the pipeline are detected, collected and analyzed, and an important basis is provided for the safe conveying of the coal slurry in the main pipeline.
Third, the content of experiment
By adopting the method for detecting the rheological property of the coal slurry based on the safe ring pipe, safe ring pipe experiments under different flow rates are respectively carried out on clean water and coal slurry with the concentration of 55%, 53% and 51%; carrying out 1 hour, 2 hours, 4 hours, 8 hours and 24 hours of slurry-carrying parking and restarting experiments respectively;
laboratory equipment: the special viscometer for the NXS-4C coal water slurry, a spectral concentration meter, a PH value tester, a vacuum filter, a measuring cylinder, a beaker, a screen, an oven, filter paper and the like.
Materials: clear water, 1700m3Coal slurry
The experimental data are as follows:
(1) specific gravity of coal and coal slurry
(2) Size grading
| Size fraction (mm) | Yield (%) | Negative cumulative yield (%) |
| 1.2 | 1.41 | |
| -1.2～+0.83 | 2.32 | 98.59 |
| -0.83～+0.425 | 15.05 | 96.27 |
| -0.425～+0.3 | 12.93 | 81.22 |
| -0.3～+0.15 | 24.94 | 68.29 |
| -0.15～+0.075 | 14.72 | 43.35 |
| -0.075～+0.045 | 7.43 | 28.63 |
| -0.045 | 21.20 | 21.20 |
| Total up to | 100 |
(3) Breakthrough heavy and slurry stop restart time
After 3 coal samples are precipitated for 24 hours, the penetration weight average value of a mud bed is 6g, the mud bed belongs to started ore pulp and can be stably started, a slurry feeding pump can be started and accelerated according to a normal starting program, and the current of a motor rises stably in the starting process.
(4) Vertical settling characteristics
When the coal slurry with the concentration of 51.3% is stopped for 24 hours, the yield of the sedimentary bed is better, and hard blockage can not be formed.
(5) Roughness of pipe wall
The average absolute roughness was about 0.25mm, indicating that the inner wall of the pipe had rusted, but not severe.
(6) Hydraulic gradient
Hydraulic gradient of clean water
| Operating flow Q, m3/h | 1775 | 1550 |
| Pressure difference, kPa | 12.7 | 9.2 |
| Hydraulic gradient i, m/km | 4.70 | 3.41 |
Hydraulic slope of 53.05% concentration coal slurry
| Operating flow Q, m3/h | 1773 | 1629 |
| Pressure difference, kPa | 21.22 | 18.41 |
| Specific gravity of ore pulp | 1.191 | 1.191 |
| Indentor, m | 1.82 | 1.58 |
| Hydraulic gradient i, m/km | 6.73 | 5.84 |
And (4) conclusion: the higher the concentration and the faster the flow rate, the larger the hydraulic gradient of the coal slurry is; 53.05% coal slurry at 1775m3The hydraulic gradient under the flow/h is 6.73, which is slightly lower than the designed value, and the conveying requirement is met.
(7) Coal slurry particle grading distribution and safe flow velocity calculation of upper, middle and lower parts of pipeline section
C/Ca measurement results
And (4) conclusion: for 51.3%, when the flow rate drops to 1350m3At/h (flow rate 1.37m/s), the C/Ca had dropped to 0.82, at which time a sliding bed of coarse particles at the bottom of the tube had begun to form. Thus, 1.37m/s can be defined as the deposition flow rate of the safety loop, and as stated, the safety flow rate of the pipe is set to 1.64 m/s.
Through the safety ring pipe test, the operation parameters of the coal slurry in the pipeline are detected, collected and analyzed, and an important basis is provided for the safe conveying of the coal slurry in the main pipeline.
Claims (6)
1. The utility model provides a device based on safe ring canal detects slurry rheological property which characterized in that: comprises a slurry storage tank (1), wherein a stirrer (2) is arranged in the slurry storage tank (1); the pulp storage tank (1) is connected with the pulp feeding pump (3) through a pipeline; the slurry feeding pump (3) is connected with one end of the safety ring pipe (4); the other end of the safety ring pipe (4) is communicated with the pulp storage tank (1); the part of the safety ring pipe (4) is a bent pipe (5); the bent pipe (5) is connected with an abrasion short pipe (6) along the flowing direction of the coal slurry;
a differential pressure transmitter a (7) and upper, middle and lower sampling points a (8) are arranged at the inlet of the safety ring pipe (4); a PH meter (9), a temperature transmitter (10), an electromagnetic flowmeter (11) and a densimeter (12) are arranged on the horizontal straight pipe part of the safety ring pipe (4); a pressure difference transmitter b (14) and upper, middle and lower sampling points b (13) are arranged at the outlet of the safety ring pipe (4); wherein the electromagnetic flow meter (11) is located upstream of the densitometer (12).
2. The safety collar-based device for determining the rheological properties of a slurry of coal as claimed in claim 1, wherein: the specification of the safety ring pipe (4) is consistent with that of a main trunk line of an actual conveying pipeline, the outer diameter is 559-610 mm, the wall thickness is 9-17.5 mm, the roughness is 0.2-0.3 mm, and the length is 250-300 m;
the horizontal laying angle of the safety ring pipe (4) is 0 degree.
3. The safety collar-based device for determining the rheological properties of a slurry of coal as claimed in claim 1, wherein: the length of the abrasion short pipe (6) is 0.8-1.2 m.
4. The safety collar-based device for determining the rheological properties of a slurry of coal as claimed in claim 1, wherein: the bending radius of the bent pipe (5) is 4-6D, and D is the outer diameter of the safety ring pipe (4).
5. The safety collar-based device for determining the rheological properties of a slurry of coal as claimed in claim 1, wherein: the specific specification of the pulp storage tank (1) is as follows: phi 19 x 23m, effective volume 5000m3Storing coal slurry 1700m3。
6. The safety collar-based device for determining the rheological properties of a slurry of coal as claimed in claim 1, wherein: the concrete specification of the slurry feeding pump (3) is as follows: metso H3010 x 8 variable frequency centrifugal slurry pump with 70m of lift and 980m of rated flow3/h。
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