CN111379588A - Mine filling slurry sedimentation segregation control system and method based on low-frequency pulse - Google Patents
Mine filling slurry sedimentation segregation control system and method based on low-frequency pulse Download PDFInfo
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- E21F15/00—Methods or devices for placing filling-up materials in underground workings
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Abstract
The invention relates to a mine filling slurry sedimentation segregation control system and method based on low-frequency pulses. The system comprises a filling pipeline, a low-frequency pulse pump pressure system, a turbulent flow pipe, a filling pipeline, a pipeline energy accumulator, an online rheology monitoring system, a filling pipeline pressure monitoring device and a filling pipeline flow monitoring device, wherein the filling pipeline is arranged in a mine roadway, an inlet of the low-frequency pulse pump pressure system is connected in parallel with the filling pipeline through the turbulent flow pipe, an outlet of the low-frequency pulse pump pressure system is communicated with the filling pipeline through the jet flow pipe, the pipeline energy accumulator is arranged on the filling pipeline, the online rheology monitoring system, the filling pipeline pressure monitoring device and the filling pipeline flow monitoring device are arranged on the filling pipeline, a pulse pump pressure output pipe pressure monitoring device and a pulse pump pressure output pipe flow monitoring device are arranged on the jet flow pipe, and a data acquisition instrument acquires data of the low-frequency pulse pump pressure system, the pipeline energy accumulator, the online. The invention changes the sedimentation and segregation state of the filling slurry and realizes high-efficiency stable-state conveying.
Description
Technical Field
The invention relates to a mine filling slurry sedimentation segregation control system and method based on low-frequency pulses, and belongs to the technical field of mineral engineering.
Background
The mine filling mining method is an important method for supporting green mining and deep resource mining, and filling slurry is mostly conveyed to an underground goaf through a pipeline in a pumping pressure or gravity flow conveying mode to realize a preset filling function. The filling slurry is mainly composed of various complex materials such as full tailings, mine waste rocks, cement, additives, water and the like. The paste has the characteristics of wide particle size distribution, high solid content, strong surface chemical action of particles and the like, and under the interaction effect of the factors, the paste body presents macroscopic characteristics of plasticity, stability and the like, the sedimentation and segregation phenomena of solid particles are easy to appear in a pipeline, the great hidden danger of pipe blockage and pipe explosion is formed, and the safe and stable transportation of the pipeline is not facilitated. The pipeline transportation of the filling slurry is the throat engineering of the whole filling link, the filling procedure is interrupted due to any accident of the filling slurry in the pipeline transportation, and the recovery of the pipeline transportation needs to spend a large amount of time, manpower and financial resources.
Disclosure of Invention
Aiming at the technical problem of sedimentation of multi-scale discrete particles in a conveying pipeline in the existing mine filling mining method, the invention provides a mine filling slurry sedimentation segregation control system based on low-frequency pulse.
The invention can provide low-frequency pulse for the filling slurry according to the rheological state orientation of the slurry, change the sedimentation segregation state, solve the problems of pipe blockage, pipe explosion and the like caused by sedimentation segregation of the composite filling slurry in long-distance conveying, and realize the high-efficiency stable-state conveying of the filling slurry.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a mine filling slurry sedimentation segregation control system based on low-frequency pulse comprises a filling pipeline 1, a low-frequency pulse pump pressure system, a pipeline energy accumulator 12, an online rheology monitoring device, a filling pipeline pressure monitoring device, a filling pipeline flow monitoring device, a pulse pump pressure output pipe pressure monitoring device, a pulse pump pressure output pipe flow monitoring device and a data acquisition instrument 16.
The filling pipeline 1 is arranged in a mine roadway, the inlet of the low-frequency pulse pumping system is connected in parallel into the filling pipeline 1 through a turbulent flow pipe 4, the outlet of the low-frequency pulse pumping system is communicated with the filling pipeline 1 through a jet pipe 5, the turbulent flow pipe 4 is positioned at the upstream of the jet pipe 5, a pipeline energy accumulator 12 is arranged on the filling pipeline 1 and is positioned at the downstream of the low-frequency pulse pumping system, the online rheological monitoring system, the filling pipeline pressure monitoring device and the filling pipeline flow monitoring device are all arranged on the filling pipeline 1, the pulse pump pressure output pipe pressure monitoring device and the pulse pump pressure output pipe flow monitoring device are all arranged on the jet pipe 5, and the low-frequency pulse pump pressure system, the pipeline energy accumulator 12, the online rheological monitoring device, the filling pipeline pressure monitoring device, the filling pipeline flow monitoring device, the pulse pump pressure output pipe pressure monitoring device and the pulse pump pressure output pipe flow monitoring device are all connected with the data acquisition instrument 16 through data lines.
The mine filling slurry sedimentation and segregation control system based on the low-frequency pulse further comprises a computer 17, and the data acquisition instrument 16 is connected with the computer 17.
Further, the low-frequency pulse pumping system comprises a hydraulic station 3 and a low-frequency plunger pump 2, the hydraulic station 3 is connected with the low-frequency plunger pump 2, an inlet of the low-frequency plunger pump 2 is connected into the filling pipeline 1 in parallel through a flow disturbing pipe 4, and an outlet of the low-frequency plunger pump 2 is communicated with the filling pipeline 1 through a jet pipe 5.
The pressure monitoring device of the pulse pump pressure output pipe is a pressure gauge III10, and the flow monitoring device of the pulse pump pressure output pipe is a flow meter III 11.
The filling pipe pressure monitoring device comprises a pressure gauge I8 and a pressure gauge II13, wherein the pressure gauge I8 is arranged on the filling pipe 1 upstream of the low-frequency pulse pumping system, and the pressure gauge II13 is arranged on the filling pipe 1 downstream of the pipe accumulator 12; the charge line flow monitoring device comprises a flow meter I9 and a flow meter II14, the flow meter I9 being arranged on the charge line 1 upstream of the low frequency pulse pumping system and the flow meter II14 being arranged on the charge line 1 downstream of the line accumulator 12.
The online rheology monitoring device comprises an online rheometer I7 and an online rheometer II15, wherein the online rheometer I7 is arranged on the filling pipeline 1 upstream of the filling pipeline pressure monitoring device, the online rheometer II15 is arranged on the filling pipeline 1 downstream of the pipeline accumulator 12, and the filling pipeline pressure monitoring device and the filling pipeline flow monitoring device are both positioned between the online rheometer I7 and the online rheometer II 15.
Preferably, the distance between the online rheometer II15 and the jet pipe 5 is not less than 5 m.
Preferably, the diameter of the filling pipeline 1 is 50-200 mm, and the conveying flow of the filling pipeline 1 is 60-300 m3H; the low-frequency pulse pump pressure system releases forward low-frequency pulse pressure, the release frequency is 0.1-3 times/min, and the maximum pulse pressure is 5-30 MPa; the pipeline energy accumulator 12 is a diaphragm type energy accumulator, and the maximum bearing pressure of the diaphragm type energy accumulator is 1.3-2.0 times of the maximum pulse pressure of the low-frequency pulse pump pressure system.
Preferably, the shear stress measuring range of the on-line rheometer I7 and the shear stress measuring range of the on-line rheometer II15 are 0-1000 Pa, and the shear rate measuring range is 0-500 s-1The maximum measurement values of the pressure gauge I8 and the pressure gauge II13 are 5-30 MPa, and the maximum measurement values of the flow meter I9 and the flow meter II14 are 60-300 m3The test ranges of the pressure gauge I8, the pressure gauge II13, the flow meter I9 and the flow meter II14 are selected according to the pressure of the filling slurry in the filling pipe 1 against the inner wall of the filling pipe 1 and the flow rate of the filling slurry.
Further, a valve 6 is arranged on the turbulent flow pipe 4;
the method comprises the steps of measuring the flow direction of filling slurry of a filling pipeline 1, wherein a turbulent flow pipe 4 is positioned at the upstream of a jet pipe 5, namely the turbulent flow pipe 4 is closer to the filling slurry inlet of the filling pipeline 1 than the jet pipe 5, a pipeline accumulator 12 is arranged on the filling pipeline 1 and is positioned at the downstream of a low-frequency pulse pump system, namely the low-frequency pulse pump system is closer to the filling slurry inlet of the filling pipeline 1 than the pipeline accumulator 12, a pressure gauge I8 is arranged on the filling pipeline 1 at the upstream of the low-frequency pulse pump system, namely a pressure gauge I8 is closer to the filling slurry inlet of the filling pipeline 1 than the low-frequency pulse pump system, a pressure gauge II13 is arranged on the filling pipeline 1 at the downstream of the pipeline accumulator 12, namely the pipeline accumulator 12 is closer to the filling slurry inlet of the filling pipeline 1 than a pressure gauge II13, a flow meter I9 is arranged on the filling pipeline 1 at the upstream of the low-frequency pulse pump system, namely a flow meter I9 is closer to the filling slurry The flow meter II14 is arranged on the filling pipeline 1 downstream of the pipeline accumulator 12, namely the pipeline accumulator 12 is closer to the filling slurry inlet of the filling pipeline 1 than the flow meter II14, the online rheometer I7 is arranged on the filling pipeline 1 upstream of the filling pipeline pressure monitoring device, namely the online rheometer I7 is closer to the filling slurry inlet of the filling pipeline 1 than the filling pipeline pressure monitoring device, and the online rheometer II15 is arranged on the filling pipeline 1 downstream of the pipeline accumulator 12, namely the pipeline accumulator 12 is closer to the filling slurry inlet of the filling pipeline 1 than the online rheometer II 15;
the pipeline energy accumulator can absorb part of pulse peak pressure and slowly release the pulse peak pressure, so that the pulse wavelength is prolonged; the low-frequency pulse pump pressure system and the pipeline energy accumulator enable inert particles settled at the bottom of the pipeline or in the settlement in the filling slurry to be in a suspended state again under the low-frequency high-energy pulse disturbance, and the settlement segregation phenomenon of the pseudo-homogeneous filling slurry is effectively controlled.
The conveying flow of the filling pipeline 1 is 60-300 m3And h, the input flow of the turbulent flow pipe 4 is far smaller than the output flow of the filling pipeline 1, so that the input flow of the turbulent flow pipe 4 is negligible relative to the delivery flow of the filling pipeline 1, and the low-frequency pulse pumping system only provides low-frequency high-pressure pulse waves.
The method for controlling the mine filling slurry sedimentation segregation control system based on the low-frequency pulse comprises the following steps:
(1) a filling pipeline of a mine filling slurry sedimentation segregation control system based on low-frequency pulse is assembled, a low-frequency pulse pump pressure system, a pipeline energy accumulator, an online rheology monitoring device, a filling pipeline pressure monitoring device, a filling pipeline flow monitoring device, a pulse pump pressure output pipe pressure monitoring device, a pulse pump pressure output pipe flow monitoring device and a data acquisition instrument are assembled, the low-frequency pulse pump pressure system, the pipeline energy accumulator, the online rheology monitoring device, the filling pipeline pressure monitoring device, the filling pipeline flow monitoring device, the pulse pump pressure output pipe pressure monitoring device and the pulse pump pressure output pipe flow monitoring device are connected with the data acquisition instrument through data lines, and the data acquisition instrument can be connected with a computer to realize automatic storage and computational analysis of data;
(2) filling slurry is configured and conveyed through a filling pipeline in a self-flowing mode, and the initial t of the filling slurry at the bottom of the filling pipeline is monitored and obtained through an online rheological monitoring device before the filling slurry enters a turbulent flow pipe0The shear stress and the shear rate at the moment are used for drawing the initial t of the filling slurry at the bottom of the filling pipeline0Time shear stress and shear rate relation curve tau-gamma&And calculating an initial t0Value of the moment yield stress tauy0Acquiring initial t through monitoring of a filling pipeline pressure monitoring device and a filling pipeline flow monitoring device0The pressure of the filling pipeline and the flow of the filling slurry in the filling pipeline at the moment;
(3) the filling slurry is not connected to a low-frequency pulse pump pressure system through a turbulent flow pipe, the pressure of the filling pipeline, the flow of the filling slurry in the filling pipeline and the shear stress and shear rate of the filling slurry at the bottom of the filling pipeline are monitored and obtained through a filling pipeline pressure monitoring device, a filling pipeline flow monitoring device and an online rheology monitoring device at the downstream of the pipeline energy accumulator, and the relation curve tau-gamma of the shear stress and the shear rate of the filling slurry at the bottom of the filling pipeline at the downstream of the pipeline energy accumulator is drawn&I.e. t1Time shear stress and shear rate relation curve tau-gamma&And calculate t1Moment yield stress tauy1Calculating and judging the sedimentation and segregation state of the filling slurry;
(4) if the filling slurry is in a settlement segregation state, the filling slurry is connected into the low-frequency pulse pump pressure system through the spoiler tube, low-frequency pulse pressure is generated through the low-frequency pulse pump pressure system, the filling slurry is pumped into a filling pipeline through the jet pipe, and pumping pulse pressure and pumping pulse flow are monitored and obtained through the pulse pump pressure output pipe pressure monitoring device and the pulse pump pressure output pipe flow monitoring device;
(5) the pipeline energy accumulator absorbs partial pulse peak pressure in the filling pipeline and slowly releases the pulse peak pressure to prolong the pulse wavelength, the filling pipeline pressure, the flow of filling slurry in the filling pipeline, the shear stress and the shear rate which are prolonged by the pulse wavelength of the pipeline energy accumulator are obtained by monitoring the filling pipeline pressure monitoring device, the filling pipeline flow monitoring device and the online rheology monitoring device, and a relation curve tau-gamma of the shear stress and the shear rate of the filling slurry at the bottom of the filling pipeline at the downstream of the pipeline energy accumulator is drawn again&I.e. t1Time shear stress and shear rate relation curve tau-gamma&And calculate t1Moment yield stress tauy1Calculating and judging the sedimentation and segregation state of the filling slurry, and regulating and controlling the plunger pulse frequency f until the filling slurry is in a homogeneous conveying state;
(6) the method comprises the steps of obtaining a shear stress and shear time relation curve tau-t through an online rheological monitoring device, detecting a rheological parameter fluctuation state through the tau-t curve, calculating a fluctuation rate w and a wavelength lambda so as to analyze the disturbance degree of pulse pressure, pulse flow and plunger frequency to filling slurry in a homogeneous conveying state, and evaluating the pipeline conveying reliability, namely pulse durability.
Further, the initial t of the filling slurry at the bottom of the filling pipeline is obtained through monitoring of an online rheometer I0The shear stress and the shear rate of the filling slurry at the bottom of the downstream filling pipeline of the pipeline energy accumulator are obtained through monitoring by an online rheometer II;
further, the method for determining the state of separation of sedimentation of the filler slurry in the step (3) comprises: gradient threshold i if yield stress changesτWhen the filling slurry is not less than the preset threshold value, the filling slurry is in a sedimentation and segregation state; gradient threshold i if yield stress changesτLess than presetWhen the threshold value is reached, the filling slurry is in a homogeneous conveying state;
further, yield stress gradient threshold iτThe preset threshold value is 20-50 Pa/km;
further, yield stress gradient threshold iτIs calculated by the formula
iτ＝(τy1-τy0)/L
Wherein, tauy0The yield stress value is Pa corresponding to the on-line rheometer I; tau isy1The yield stress value corresponding to the on-line rheometer II is shown, and Pa and L are distances between the on-line rheometer I and the on-line rheometer II;
value of yield stress tauy0And τy1Are all according to the rheological characteristic curve, namely the relation curve of shear stress and shear rate&Calculating the yield stress tau per minute from the Bingham equationyAnd plastic viscosity ηpEach yield stress value tauyAnd a plastic viscosity value of ηpAll the results are obtained by fitting Bingham equation sets at 60 time points, namely the equation sets
Wherein, tau1、τ2、τ3、τ4……τ60The shear stress values at 1 st, 2 nd, 3 rd and 4 th 4 … … 60 th time points respectively,
shear rate values at 1 st, 2 nd, 3 nd, 4 th 4 … … 60 th time points, respectively;
further, the method for regulating and controlling the plunger pulse frequency f comprises the following specific steps:
1) presetting initial plunger pulse frequency f0Calculating the initial plunger pulse frequency f0Threshold value of gradient of change of yield stress ofτ；
2) If it isYield stress gradient threshold iτLess than yield stress gradient threshold iτMaintaining the initial plunger pulse frequency f0(ii) a Gradient threshold i if yield stress changesτNot less than yield stress variation gradient threshold iτThe predetermined threshold value of (a) is then predetermined to be the growth coefficient k, let t be t +1, and f be f0+ kt, and then calculating the yield stress change gradient threshold value i when the plunger pulse frequency fτTo yield stress gradient threshold iτLess than yield stress gradient threshold iτMaintaining the plunger pulse frequency f.
Further, the initial plunger pulse frequency f00.1-0.5 times/min, the growth coefficient k is 0.1-1, and t is 1-2 min;
further, the calculation method of the fluctuation ratio w and the wavelength lambda is
τmaxAt peak shear stress, τmidFor the purpose of the median shear stress,
for the moment when the maximum shear stress is the corresponding moment,
v is the average flow velocity of the filling slurry at the moment when the minimum shear stress is the corresponding moment;
the fluctuation rate reflects the strong disturbance degree of the low-frequency pulse on the filling slurry, and the larger the fluctuation rate is, the more violent the disturbance is; the wavelength reflects the persistence of the low-frequency pulse to the disturbance of the filling slurry, and the longer the wavelength is, the better the persistence is: when w is more than 1, the disturbance effect is severe; when w is more than 0.5 and less than 1, the disturbance effect is moderate; when w is more than 0 and less than 0.5, the disturbance effect is poor; when lambda & gt is larger than a preset value, the current pulse has better durability, wherein the preset value of lambda is 30-50 m;
monitoring the flow disturbance rule of the low-frequency pulse pumping system on the filling pipeline system through a flowmeter I and a flowmeter II, and evaluating the flow steady state condition; the total pressure change characteristics of the filling pipeline are monitored through the pressure gauge I and the pressure gauge II, the total energy input into the filling pipeline system by the low-frequency pulse pumping system is evaluated, and parameters are provided for on-way resistance analysis and power demand calculation.
The invention has the beneficial effects that:
(1) on the premise of not changing the existing working condition of the conveying pipeline, the invention changes the sedimentation segregation state of the slurry in the filling pipeline through low flow, high pump pressure and low frequency pulse, realizes that the bed load particles in sliding, rolling and jumping states move in a suspension state, crystallizes the pseudo-homogeneous state of the filling slurry, and finally realizes the safe and stable conveying of the filling slurry;
(2) the mine filling slurry sedimentation and segregation control system based on the low-frequency pulse has the function of effectively controlling sedimentation and segregation of multi-scale discrete particles in the filling slurry in a pipeline, realizes effective adjustment of different material compositions and pumping frequency under different working conditions through rheological state monitoring, kinematics and dynamics monitoring, and improves the homogeneous fluidity of the filling slurry in a targeted manner.
Drawings
FIG. 1 is a schematic structural diagram of a mine filling slurry sedimentation segregation control system based on low-frequency pulses;
FIG. 2 is a flow chart of the regulation of the plunger pulse frequency f;
FIG. 3 example 3 initial t0Time shear stress and shear rate relation curve tau-gamma&；
In the figure: 1-filling a pipeline, 2-low-frequency plunger pump, 3-hydraulic station, 4-turbulent flow pipe, 5-jet flow pipe, 6-valve, 7-online rheometer I, 8-pressure meter I, 9-flow meter I, 10-pressure meter III, 11-flow meter III, 12-pipeline accumulator, 13-pressure meter II, 14-flow meter II, 15-online rheometer II, 16-data collector and 17-computer.
Detailed Description
The present invention will be further described with reference to the following embodiments.
Example 1: as shown in figure 1, the mine filling slurry sedimentation and segregation control system based on low-frequency pulse comprises a filling pipeline 1, a low-frequency pulse pump pressure system, a pipeline energy accumulator 12, an online rheological monitoring device, a filling pipeline pressure monitoring device, a filling pipeline flow monitoring device, a pulse pump pressure output pipe pressure monitoring device, a pulse pump pressure output pipe flow monitoring device and a data acquisition instrument 16,
the filling pipeline 1 is arranged in a mine roadway, the inlet of the low-frequency pulse pumping system is connected in parallel into the filling pipeline 1 through a turbulent flow pipe 4, the outlet of the low-frequency pulse pumping system is communicated with the filling pipeline 1 through a jet pipe 5, the turbulent flow pipe 4 is positioned at the upstream of the jet pipe 5, a pipeline energy accumulator 12 is arranged on the filling pipeline 1 and is positioned at the downstream of the low-frequency pulse pumping system, the online rheological monitoring system, the filling pipeline pressure monitoring device and the filling pipeline flow monitoring device are all arranged on the filling pipeline 1, the pulse pump pressure output pipe pressure monitoring device and the pulse pump pressure output pipe flow monitoring device are all arranged on the jet pipe 5, and the low-frequency pulse pump pressure system, the pipeline energy accumulator 12, the online rheological monitoring device, the filling pipeline pressure monitoring device, the filling pipeline flow monitoring device, the pulse pump pressure output pipe pressure monitoring device and the pulse pump pressure output pipe flow monitoring device are all connected with the data acquisition instrument 16 through data lines;
preferably, the mine filling slurry sedimentation and segregation control system based on low-frequency pulses in the embodiment further comprises a computer 17, and the data acquisition instrument 16 is connected with the computer 17;
preferably, the low-frequency pulse pumping system in the embodiment includes a hydraulic station 3 and a low-frequency plunger pump 2, the hydraulic station 3 is connected with the low-frequency plunger pump 2, an inlet of the low-frequency plunger pump 2 is connected in parallel to a filling pipeline 1 through a turbulent flow pipe 4, and an outlet of the low-frequency plunger pump 2 is communicated with the filling pipeline 1 through a jet pipe 5;
preferably, the pressure monitoring device of the pulse pump pressure output pipe in the embodiment is a pressure gauge III10, and the flow monitoring device of the pulse pump pressure output pipe is a flow meter III 11;
preferably, the filling pipe pressure monitoring device of the present embodiment comprises a pressure gauge I8 and a pressure gauge II13, wherein the pressure gauge I8 is arranged on the filling pipe 1 upstream of the low frequency pulse pumping system, and the pressure gauge II13 is arranged on the filling pipe 1 downstream of the pipe accumulator 12; the filling pipeline flow monitoring device comprises a flow meter I9 and a flow meter II14, wherein the flow meter I9 is arranged on the filling pipeline 1 upstream of the low-frequency pulse pumping system, and the flow meter II14 is arranged on the filling pipeline 1 downstream of the pipeline accumulator 12;
preferably, the online rheology monitoring device of the embodiment includes an online rheometer I7 and an online rheometer II15, the online rheometer I7 is disposed on the filling pipe 1 upstream of the filling pipe pressure monitoring device, the online rheometer II15 is disposed on the filling pipe 1 downstream of the pipe accumulator 12, and the filling pipe pressure monitoring device and the filling pipe flow monitoring device are both located between the online rheometer I7 and the online rheometer II 15;
more preferably, the distance between the online rheometer II15 and the jet pipe 5 is not less than 5 m;
more preferably, the diameter of the filling pipeline 1 is 50-200 mm, and the delivery flow of the filling pipeline 1 is 60-300 m3H; the low-frequency pulse pump pressure system releases forward low-frequency pulse pressure, the release frequency is 0.1-3 times/min, and the maximum pulse pressure is 5-30 MPa; the pipeline energy accumulator 12 is a diaphragm type energy accumulator, and the maximum bearing pressure of the diaphragm type energy accumulator is 1.3-2.0 times of the maximum pulse pressure of the low-frequency pulse pump pressure system;
more preferably, the shear stress measuring range of the on-line rheometer I7 and the shear rate measuring range of the on-line rheometer II15 in the embodiment are 0 to 1000Pa and 0 to 500s-1The maximum measurement values of the pressure gauge I8 and the pressure gauge II13 are 5-30 MPa, and the maximum measurement values of the flow meter I9 and the flow meter II14 are 60-300 m3The test ranges of the pressure gauge I8, the pressure gauge II13, the flow meter I9 and the flow meter II14 are selected according to the pressure of the filling slurry in the filling pipe 1 on the inner wall of the filling pipe 1 and the flow rate of the filling slurry;
the turbulent flow pipe 4 of the embodiment is provided with a valve 6;
the method comprises the steps of measuring the flow direction of filling slurry of a filling pipeline 1, wherein a turbulent flow pipe 4 is positioned at the upstream of a jet pipe 5, namely the turbulent flow pipe 4 is closer to the filling slurry inlet of the filling pipeline 1 than the jet pipe 5, a pipeline accumulator 12 is arranged on the filling pipeline 1 and is positioned at the downstream of a low-frequency pulse pump system, namely the low-frequency pulse pump system is closer to the filling slurry inlet of the filling pipeline 1 than the pipeline accumulator 12, a pressure gauge I8 is arranged on the filling pipeline 1 at the upstream of the low-frequency pulse pump system, namely a pressure gauge I8 is closer to the filling slurry inlet of the filling pipeline 1 than the low-frequency pulse pump system, a pressure gauge II13 is arranged on the filling pipeline 1 at the downstream of the pipeline accumulator 12, namely the pipeline accumulator 12 is closer to the filling slurry inlet of the filling pipeline 1 than a pressure gauge II13, a flow meter I9 is arranged on the filling pipeline 1 at the upstream of the low-frequency pulse pump system, namely a flow meter I9 is closer to the filling slurry The flow meter II14 is arranged on the filling pipeline 1 downstream of the pipeline accumulator 12, namely the pipeline accumulator 12 is closer to the filling slurry inlet of the filling pipeline 1 than the flow meter II14, the online rheometer I7 is arranged on the filling pipeline 1 upstream of the filling pipeline pressure monitoring device, namely the online rheometer I7 is closer to the filling slurry inlet of the filling pipeline 1 than the filling pipeline pressure monitoring device, and the online rheometer II15 is arranged on the filling pipeline 1 downstream of the pipeline accumulator 12, namely the pipeline accumulator 12 is closer to the filling slurry inlet of the filling pipeline 1 than the online rheometer II 15;
the pipeline energy accumulator can absorb part of pulse peak pressure and slowly release the pulse peak pressure, so that the pulse wavelength is prolonged; the low-frequency pulse pump pressure system and the pipeline energy accumulator enable inert particles settled at the bottom of the pipeline or in the settlement in the filling slurry to be in a suspended state again under the low-frequency high-energy pulse disturbance, so that the settlement segregation phenomenon of the pseudo-homogeneous filling slurry is effectively controlled;
the conveying flow of the filling pipeline 1 is 60-300 m3And h, the input flow of the turbulent flow pipe 4 is far smaller than the output flow of the filling pipeline 1, so that the input flow of the turbulent flow pipe 4 is negligible relative to the delivery flow of the filling pipeline 1, and the low-frequency pulse pumping system only provides low-frequency high-pressure pulse waves.
Example 2: the method for controlling the mine filling slurry sedimentation segregation control system based on the low-frequency pulse in the embodiment 1 comprises the following steps:
(1) a filling pipeline of a mine filling slurry sedimentation segregation control system based on low-frequency pulse is assembled, a low-frequency pulse pump pressure system, a pipeline energy accumulator, an online rheology monitoring device, a filling pipeline pressure monitoring device, a filling pipeline flow monitoring device, a pulse pump pressure output pipe pressure monitoring device, a pulse pump pressure output pipe flow monitoring device and a data acquisition instrument are assembled, the low-frequency pulse pump pressure system, the pipeline energy accumulator, the online rheology monitoring device, the filling pipeline pressure monitoring device, the filling pipeline flow monitoring device, the pulse pump pressure output pipe pressure monitoring device and the pulse pump pressure output pipe flow monitoring device are connected with the data acquisition instrument through data lines, and the data acquisition instrument can be connected with a computer to realize automatic storage and computational analysis of data;
(2) filling slurry is configured and conveyed through a filling pipeline in a self-flowing mode, and the initial t of the filling slurry at the bottom of the filling pipeline is obtained through the monitoring of an online rheometer I of an online rheological monitoring device before the filling slurry enters a turbulent flow pipe0The shear stress and the shear rate at the moment are used for drawing the initial t of the filling slurry at the bottom of the filling pipeline0Time shear stress and shear rate relation curve tau-gamma&And calculating an initial t0Value of the moment yield stress tauy0Acquiring initial t through monitoring of pressure gauge I of filling pipeline pressure monitoring device and flow meter I of filling pipeline flow monitoring device0The pressure of the filling pipeline and the flow of the filling slurry in the filling pipeline at the moment; wherein the value of yield stress tauy0According to the rheological characteristic curve, i.e. the relation curve of shear stress and shear rate&Calculating the yield stress tau per minute from the Bingham equationyAnd plastic viscosity ηpEach yield stress value tauyAnd a plastic viscosity value of ηpAll the results are obtained by fitting Bingham equation sets at 60 time points, namely the equation sets
Wherein, tau1、τ2、τ3、τ4……τ60The shear stress values at 1 st, 2 nd, 3 rd and 4 th 4 … … 60 th time points respectively,
shear rate values at 1 st, 2 nd, 3 nd, 4 th 4 … … 60 th time points, respectively;
(3) the filling slurry is not connected into a low-frequency pulse pump pressure system through a turbulent flow pipe, the pressure of the filling pipeline, the flow of the filling slurry in the filling pipeline and the shear stress and shear rate of the filling slurry at the bottom of the filling pipeline are obtained through monitoring by a filling pipeline pressure monitoring device, a filling pipeline flow monitoring device and an online rheometer II of the online rheology monitoring device at the downstream of the pipeline energy accumulator, and a tau-gamma relation curve of the shear stress and the shear rate of the filling slurry at the bottom of the filling pipeline at the downstream of the pipeline energy accumulator is drawn&I.e. t1Time shear stress and shear rate relation curve tau-gamma&And calculate t1Moment yield stress tauy1Calculating and judging the sedimentation and segregation state of the filling slurry; the determination method of the sedimentation and segregation state of the filling slurry comprises the following steps: gradient threshold i if yield stress changesτWhen the filling slurry is not less than the preset threshold value, the filling slurry is in a sedimentation and segregation state; gradient threshold i if yield stress changesτWhen the filling slurry is smaller than a preset threshold value, the filling slurry is in a homogeneous conveying state; yield stress gradient threshold iτThe preset threshold value is 20-50 Pa/km;
yield stress gradient threshold iτIs calculated by the formula
iτ＝(τy1-τy0)/L
Wherein, tauy0The yield stress value is Pa corresponding to the on-line rheometer I; tau isy1The yield stress value corresponding to the on-line rheometer II is shown, and Pa and L are distances between the on-line rheometer I and the on-line rheometer II;
value of yield stress tauy1According to the rheological characteristic curve, i.e. shear stress and shear rateRelation tau-gamma&Calculating the yield stress tau per minute from the Bingham equationyAnd plastic viscosity ηpEach yield stress value tauyAnd a plastic viscosity value of ηpAll the results are obtained by fitting Bingham equation sets at 60 time points, namely the equation sets
Wherein, tau1、τ2、τ3、τ4……τ60The shear stress values at 1 st, 2 nd, 3 rd and 4 th 4 … … 60 th time points respectively,
shear rate values at 1 st, 2 nd, 3 nd, 4 th 4 … … 60 th time points, respectively;
(4) if the filling slurry is in a settlement segregation state, the filling slurry is connected into the low-frequency pulse pump pressure system through the spoiler tube, low-frequency pulse pressure is generated through the low-frequency pulse pump pressure system, the filling slurry is pumped into a filling pipeline through the jet pipe, and pumping pulse pressure and pumping pulse flow are monitored and obtained through the pulse pump pressure output pipe pressure monitoring device and the pulse pump pressure output pipe flow monitoring device;
(5) the pipeline energy accumulator absorbs partial pulse peak pressure in the filling pipeline and slowly releases the pulse peak pressure to prolong the pulse wavelength, the filling pipeline pressure, the flow of filling slurry in the filling pipeline, the shear stress and the shear rate which are prolonged by the pulse wavelength of the pipeline energy accumulator are obtained by monitoring the filling pipeline pressure monitoring device, the filling pipeline flow monitoring device and the online rheology monitoring device, and a relation curve tau-gamma of the shear stress and the shear rate of the filling slurry at the bottom of the filling pipeline at the downstream of the pipeline energy accumulator is drawn again&I.e. t1Time shear stress and shear rate relation curve tau-gamma&And calculate t1Moment yield stress tauy1Calculating and determining the state of sedimentation and segregation of the filling slurryAnd regulating the plunger pulse frequency f until the filling slurry is in a homogeneous conveying state; the method for regulating and controlling the plunger pulse frequency f (see fig. 2) comprises the following specific steps:
1) presetting initial plunger pulse frequency f0Calculating the initial plunger pulse frequency f0Threshold value of gradient of change of yield stress ofτ；
2) Gradient threshold i if yield stress changesτLess than yield stress gradient threshold iτMaintaining the initial plunger pulse frequency f0(ii) a Gradient threshold i if yield stress changesτNot less than yield stress variation gradient threshold iτThe predetermined threshold value of (a) is then predetermined to be the growth coefficient k, let t be t +1, and f be f0+ kt, and then calculating the yield stress change gradient threshold value i when the plunger pulse frequency fτTo yield stress gradient threshold iτLess than yield stress gradient threshold iτMaintaining the plunger pulse frequency f; initial plunger pulse frequency f00.1-0.5 times/min, the growth coefficient k is 0.1-1, the time interval of t value increase is 1-2 min, and the initial t is 1;
(6) acquiring a relation curve tau-t of shear stress and shear time through an online rheological monitoring device, detecting a rheological parameter fluctuation state through the tau-t curve, calculating a fluctuation rate w and a wavelength lambda so as to analyze the disturbance degree of pulse pressure, pulse flow and plunger frequency to filling slurry in a homogeneous conveying state, and evaluating the pipeline conveying reliability, namely pulse durability; wherein
The calculation method of the fluctuation ratio w and the wavelength lambda comprises the following steps
τmaxAt peak shear stress, τmidFor the purpose of the median shear stress,
for the moment when the maximum shear stress is the corresponding moment,
v is the average flow velocity of the filling slurry at the moment when the minimum shear stress is the corresponding moment;
the fluctuation rate reflects the strong disturbance degree of the low-frequency pulse on the filling slurry, and the larger the fluctuation rate is, the more violent the disturbance is; the wavelength reflects the persistence of the low-frequency pulse to the disturbance of the filling slurry, and the longer the wavelength is, the better the persistence is: when w is more than 1, the disturbance effect is severe; when w is more than 0.5 and less than 1, the disturbance effect is moderate; when w is more than 0 and less than 0.5, the disturbance effect is poor; when lambda & gt is larger than a preset value, the current pulse has better durability, wherein the preset value of lambda is 30-50 m;
monitoring the flow disturbance rule of the low-frequency pulse pumping system on the filling pipeline system through a flowmeter I and a flowmeter II, and evaluating the flow steady state condition; the total pressure change characteristics of the filling pipeline are monitored through the pressure gauge I and the pressure gauge II, the total energy input into the filling pipeline system by the low-frequency pulse pumping system is evaluated, and parameters are provided for on-way resistance analysis and power demand calculation.
Example 3: the filling slurry prepared from the full tailings, the waste rocks, the cement, the water and the like in the embodiment has the mass concentration of 72%, the proportion of the full tailings to the waste rocks is 6:4, the ratio of the ash to the sand is 1:10, the slump of the prepared filling slurry is 26cm, the pipe diameter of a filling pipeline is 100mm, the length of a horizontal pipeline is 5km, and the geometric filling multiple line of the pipeline is 3;
the method for controlling the mine filling slurry sedimentation segregation control system based on the low-frequency pulse in the embodiment 1 comprises the following steps:
(1) a filling pipeline of a mine filling slurry sedimentation segregation control system based on low-frequency pulse is assembled, a low-frequency pulse pump pressure system, a pipeline energy accumulator, an online rheology monitoring device, a filling pipeline pressure monitoring device, a filling pipeline flow monitoring device, a pulse pump pressure output pipe pressure monitoring device, a pulse pump pressure output pipe flow monitoring device and a data acquisition instrument are assembled, the low-frequency pulse pump pressure system, the pipeline energy accumulator, the online rheology monitoring device, the filling pipeline pressure monitoring device, the filling pipeline flow monitoring device, the pulse pump pressure output pipe pressure monitoring device and the pulse pump pressure output pipe flow monitoring device are connected with the data acquisition instrument through data lines, and the data acquisition instrument can be connected with a computer to realize automatic storage and computational analysis of data; because the filling failure accident is caused by pipe blockage in the horizontal pipe section when filling slurry is conveyed in test operation, the mine filling slurry sedimentation segregation control system based on low-frequency pulse is arranged at the position of 100m at the front end of the horizontal pipe of the filling pipeline;
(2) filling slurry is configured and conveyed through a filling pipeline in a self-flowing mode, and the initial t of the filling slurry at the bottom of the filling pipeline is obtained through the monitoring of an online rheometer I of an online rheological monitoring device before the filling slurry enters a turbulent flow pipe0The shear stress and the shear rate at the moment are used for drawing the initial t of the filling slurry at the bottom of the filling pipeline0Time shear stress and shear rate relation curve tau-gamma&(see FIG. 3), and calculates an initial t0Value of the moment yield stress tauy0The initial t is obtained by monitoring a pressure gauge I of a filling pipeline pressure monitoring device and a flow meter I of a filling pipeline flow monitoring device at 150Pa0The pressure of the filling pipeline at the moment is 10MPa and the flow rate of the filling slurry in the filling pipeline is 80m3H; (ii) a Wherein the value of yield stress tauy0According to the rheological characteristic curve, i.e. the relation curve of shear stress and shear rate&Calculating the yield stress tau per minute from the Bingham equationyAnd plastic viscosity ηpEach yield stress value tauyAnd a plastic viscosity value of ηpAll the results are obtained by fitting Bingham equation sets at 60 time points, namely the equation sets
Wherein, tau1、τ2、τ3、τ4……τ60The shear stress values at 1 st, 2 nd, 3 rd and 4 th 4 … … 60 th time points respectively,
shear rate values at 1 st, 2 nd, 3 nd, 4 th 4 … … 60 th time points, respectively; yield stress value tau of the present exampley0Is 150 Pa;
(3) the filling slurry is not connected into the low-frequency pulse pump pressure system through the turbulent flow tube, the pressure of the filling pipeline is 5MPa and the flow of the filling slurry in the filling pipeline is 80m through the monitoring of a pressure gauge II of a filling pipeline pressure monitoring device, a flow meter II of a filling pipeline flow monitoring device and an online rheometer II of the online rheology monitoring device at the downstream of the pipeline energy accumulator3H and the shear stress and the shear rate of the filling slurry at the bottom of the filling pipeline, and drawing a relation curve tau-gamma of the shear stress and the shear rate of the filling slurry at the bottom of the filling pipeline at the downstream of the pipeline energy accumulator&I.e. t1Time shear stress and shear rate relation curve tau-gamma&And calculate t1Moment yield stress tauy1Calculating and judging the sedimentation and segregation state of the filling slurry; the determination method of the sedimentation and segregation state of the filling slurry comprises the following steps: gradient threshold i if yield stress changesτWhen the filling slurry is not less than the preset threshold value, the filling slurry is in a sedimentation and segregation state; gradient threshold i if yield stress changesτWhen the filling slurry is smaller than a preset threshold value, the filling slurry is in a homogeneous conveying state; yield stress gradient threshold iτThe preset threshold value is 40 Pa/km;
yield stress gradient threshold iτIs calculated by the formula
iτ＝(τy1-τy0)/L
Wherein, tauy0The yield stress value is Pa corresponding to the on-line rheometer I; tau isy1The yield stress value corresponding to the on-line rheometer II is shown, and Pa and L are distances between the on-line rheometer I and the on-line rheometer II;
value of yield stress tauy1Are all according to the rheological characteristic curve, namely the relation curve of shear stress and shear rate&Calculating the yield stress tau per minute from the Bingham equationyAnd plastic viscosity ηpEach yield stressValue τyAnd a plastic viscosity value of ηpAll the results are obtained by fitting Bingham equation sets at 60 time points, namely the equation sets
Wherein, tau1、τ2、τ3、τ4……τ60The shear stress values at 1 st, 2 nd, 3 rd and 4 th 4 … … 60 th time points respectively,
shear rate values at 1 st, 2 nd, 3 nd, 4 th 4 … … 60 th time points, respectively;
(4) gradient threshold i due to yield stress variation in this exampleτIs 50Pa/km higher than yield stress change gradient threshold iτThe preset threshold value is 40Pa/km, the filling slurry is in a settlement segregation state, a valve of a turbulent flow pipe is opened, the filling slurry is connected into a low-frequency pulse pump pressure system through the turbulent flow pipe, low-frequency pulse pressure is generated through the low-frequency pulse pump pressure system, the filling slurry is pumped into a filling pipeline through a jet pipe, and pumping pulse pressure of 8MPa and pumping pulse flow of 100m are obtained through monitoring of a pulse pump pressure output pipe pressure monitoring device and a pulse pump pressure output pipe flow monitoring device3/h；
(5) In the embodiment, the maximum bearing pressure of the pipeline energy accumulator is 1.5 times of the maximum pulse pressure, the pipeline energy accumulator absorbs partial pulse peak pressure in the filling pipeline and slowly releases the partial pulse peak pressure to prolong the pulse wavelength, the filling pipeline pressure, the flow of filling slurry in the filling pipeline, the shear stress and the shear rate of the filling pipeline bottom filling slurry at the downstream of the pipeline energy accumulator are obtained by monitoring through the filling pipeline pressure monitoring device, the filling pipeline flow monitoring device and the online rheological monitoring device, and the relation curve tau-gamma of the shear stress and the shear rate of the filling pipeline bottom filling slurry at the downstream of the pipeline energy accumulator is drawn again&I.e. t1Time shear stress and shear rate relation curve tau-gamma&And calculate t1Moment yield stress tauy1Calculating and judging the sedimentation and segregation state of the filling slurry, and regulating and controlling the plunger pulse frequency f until the filling slurry is in a homogeneous conveying state; the regulation and control method of the plunger pulse frequency f (see fig. 2):
1) presetting initial plunger pulse frequency f0At 0.2 times/min, calculating the initial plunger pulse frequency f0Threshold value of gradient of change of yield stress ofτ；
2) Yield stress variation gradient threshold i of the present embodimentτThe preset threshold value is 40 Pa/km; gradient threshold i if yield stress changesτLess than yield stress gradient threshold iτMaintaining the initial plunger pulse frequency f0(ii) a While the yield stress variation gradient threshold i of the embodimentτ50Pa/km higher than the yield stress change gradient threshold iτIf the preset threshold value is 40Pa/km, the preset growth coefficient k is 0.2, let t be t +1, and f be f0+ kt, and then calculating the yield stress change gradient threshold value i when the plunger pulse frequency fτTo yield stress gradient threshold iτLess than yield stress gradient threshold iτThe preset threshold value of 40Pa/km, and the pulse frequency f of the plunger is maintained to be 0.4 times/min; wherein the time interval for increasing the value of t is 1-2 min, and the initial t is 1;
(6) acquiring a relation curve tau-t of shear stress and shear time through an online rheological monitoring device, detecting a rheological parameter fluctuation state through the tau-t curve, calculating a fluctuation rate w and a wavelength lambda so as to analyze the disturbance degree of pulse pressure, pulse flow and plunger frequency to filling slurry in a homogeneous conveying state, and evaluating the pipeline conveying reliability, namely pulse durability; wherein
The calculation method of the fluctuation ratio w and the wavelength lambda comprises the following steps
τmaxAt peak shear stress, τmidFor the purpose of the median shear stress,
for the moment when the maximum shear stress is the corresponding moment,
v is the average flow velocity of the filling slurry at the moment when the minimum shear stress is the corresponding moment;
the fluctuation rate reflects the strong disturbance degree of the low-frequency pulse on the filling slurry, and the larger the fluctuation rate is, the more violent the disturbance is; the wavelength reflects the persistence of the low-frequency pulse to the disturbance of the filling slurry, and the longer the wavelength is, the better the persistence is: when w is more than 1, the disturbance effect is severe; when w is more than 0.5 and less than 1, the disturbance effect is moderate; when w is more than 0 and less than 0.5, the disturbance effect is poor; when lambda is larger than a preset value, the current pulse has better durability, wherein the preset value of lambda is 40 m;
in this embodiment, w is 0.8, so the disturbance effect is moderate; in the embodiment, the preset value of lambda is 40m, and the actual value of lambda is 70m, so that the current pulse has better durability;
monitoring the flow disturbance rule of the low-frequency pulse pumping system on the filling pipeline system through the flowmeter I and the flowmeter II, and evaluating the flow steady state condition; the total pressure change characteristics of the filling pipeline are monitored through the pressure gauge I and the pressure gauge II, so that the total energy input by the low-frequency pulse pumping system for the filling pipeline system can be evaluated, and parameters are provided for on-way resistance analysis and power demand calculation.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes and modifications can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (10)
1. The utility model provides a mine filling ground paste subsides segregation control system based on low frequency pulse which characterized in that: comprises a filling pipeline (1), a low-frequency pulse pump pressure system, a pipeline energy accumulator (12), an online rheology monitoring device, a filling pipeline pressure monitoring device, a filling pipeline flow monitoring device, a pulse pump pressure output pipe pressure monitoring device, a pulse pump pressure output pipe flow monitoring device and a data acquisition instrument (16),
the filling pipeline (1) is arranged in a mine roadway, an inlet of a low-frequency pulse pump pressure system is connected into the filling pipeline (1) in parallel through a flow disturbing pipe (4), an outlet of the low-frequency pulse pump pressure system is communicated with the filling pipeline (1) through a jet pipe (5), the flow disturbing pipe (4) is positioned at the upstream of the jet pipe (5), a pipeline energy accumulator (12) is arranged on the filling pipeline (1) and positioned at the downstream of the low-frequency pulse pump pressure system, an online rheology monitoring system, a filling pipeline pressure monitoring device and a filling pipeline flow monitoring device are all arranged on the filling pipeline (1), a pulse pump pressure output pipe pressure monitoring device and a pulse pump pressure output pipe flow monitoring device are all arranged on the jet pipe (5), and the low-frequency pulse pump pressure system, the pipeline energy accumulator (12), the online rheology monitoring device, the filling pipeline pressure monitoring device, the filling pipeline flow monitoring device, The pulse pump pressure output pipe pressure monitoring device and the pulse pump pressure output pipe flow monitoring device are connected with a data acquisition instrument (16) through data lines.
2. The low frequency pulse-based mine fill slurry settling segregation control system of claim 1, wherein: the device also comprises a computer (17), and the data acquisition instrument (16) is connected with the computer (17).
3. The low-frequency pulse-based mine fill slurry settling segregation control system of claim 1 or 2, wherein: the low-frequency pulse pumping system comprises a hydraulic station (3) and a low-frequency plunger pump (2), wherein the hydraulic station (3) is connected with the low-frequency plunger pump (2), an inlet of the low-frequency plunger pump (2) is connected into a filling pipeline (1) in parallel through a turbulent flow pipe (4), and an outlet of the low-frequency plunger pump (2) is communicated with the filling pipeline (1) through a jet pipe (5).
4. The low frequency pulse-based mine fill slurry settling segregation control system of claim 1, wherein: the pressure monitoring device of the pulse pump pressure output pipe is a pressure gauge III (10), the flow monitoring device of the pulse pump pressure output pipe is a flow meter III (11), the filling pipeline pressure monitoring device comprises a pressure gauge I (8) and a pressure gauge II (13), the pressure gauge I (8) is arranged on the filling pipeline (1) at the upstream of the low-frequency pulse pump pressure system, and the pressure gauge II (13) is arranged on the filling pipeline (1) at the downstream of the pipeline energy accumulator (12); the filling pipeline flow monitoring device comprises a flowmeter I (9) and a flowmeter II (14), wherein the flowmeter I (9) is arranged on the filling pipeline (1) at the upstream of the low-frequency pulse pumping system, and the flowmeter II (14) is arranged on the filling pipeline (1) at the downstream of the pipeline accumulator (12); the online rheology monitoring device comprises an online rheology instrument I (7) and an online rheology instrument II (15), wherein the online rheology instrument I (7) is arranged on a filling pipeline (1) at the upstream of the filling pipeline pressure monitoring device, the online rheology instrument II (15) is arranged on the filling pipeline (1) at the downstream of the pipeline energy accumulator (12), and the filling pipeline pressure monitoring device and the filling pipeline flow monitoring device are both positioned between the online rheology instrument I (7) and the online rheology instrument II (15).
5. The low frequency pulse-based mine fill slurry settling segregation control system of claim 4, wherein: the distance between the online rheometer II (15) and the jet pipe (5) is not less than 5m, the diameter of the filling pipeline (1) is 50-200 mm, and the conveying flow of the filling pipeline (1) is 60-300 m3H; the low-frequency pulse pump pressure system releases forward low-frequency pulse pressure, the release frequency is 0.1-3 times/min, and the maximum pulse pressure is 5-30 MPa; the pipeline energy accumulator (12) is a diaphragm type energy accumulator, and the maximum bearing pressure of the diaphragm type energy accumulator is 1.3-2.0 times of the maximum pulse pressure of the low-frequency pulse pump pressure system.
6. The mine filling slurry sedimentation segregation control method based on the low-frequency pulse is characterized by comprising the following steps of: the mine filling slurry sedimentation segregation control system based on low-frequency pulse is adopted, and the method comprises the following specific steps:
(1) a filling pipeline of a mine filling slurry sedimentation segregation control system based on low-frequency pulse is assembled, a low-frequency pulse pump pressure system, a pipeline energy accumulator, an online rheology monitoring device, a filling pipeline pressure monitoring device, a filling pipeline flow monitoring device, a pulse pump pressure output pipe pressure monitoring device, a pulse pump pressure output pipe flow monitoring device and a data acquisition instrument are assembled, the low-frequency pulse pump pressure system, the pipeline energy accumulator, the online rheology monitoring device, the filling pipeline pressure monitoring device, the filling pipeline flow monitoring device, the pulse pump pressure output pipe pressure monitoring device and the pulse pump pressure output pipe flow monitoring device are connected with the data acquisition instrument through data lines, and the data acquisition instrument is connected with a computer to realize automatic storage and calculation analysis of data;
(2) filling slurry is configured and conveyed through a filling pipeline in a self-flowing mode, and the initial t of the filling slurry at the bottom of the filling pipeline is monitored and obtained through an online rheological monitoring device before the filling slurry enters a turbulent flow pipe0The shear stress and the shear rate at the moment are used for drawing the initial t of the filling slurry at the bottom of the filling pipeline0Time shear stress and shear rate relation curve tau-gamma&And calculating an initial t0Value of the moment yield stress tauy0Acquiring initial t through monitoring of a filling pipeline pressure monitoring device and a filling pipeline flow monitoring device0The pressure of the filling pipeline and the flow of the filling slurry in the filling pipeline at the moment;
(3) the filling slurry is not connected to a low-frequency pulse pump pressure system through a turbulent flow pipe, the pressure of the filling pipeline, the flow of the filling slurry in the filling pipeline and the shear stress and shear rate of the filling slurry at the bottom of the filling pipeline are monitored and obtained through a filling pipeline pressure monitoring device, a filling pipeline flow monitoring device and an online rheology monitoring device at the downstream of the pipeline energy accumulator, and the relation curve tau-gamma of the shear stress and the shear rate of the filling slurry at the bottom of the filling pipeline at the downstream of the pipeline energy accumulator is drawn&I.e. t1Time shear stress and shear rate relation curve tau-gamma&And calculate t1Moment yield stress tauy1Calculating and judging the sedimentation and segregation state of the filling slurry;
(4) if the filling slurry is in a settlement segregation state, the filling slurry is connected into the low-frequency pulse pump pressure system through the spoiler tube, low-frequency pulse pressure is generated through the low-frequency pulse pump pressure system, the filling slurry is pumped into a filling pipeline through the jet pipe, and pumping pulse pressure and pumping pulse flow are monitored and obtained through the pulse pump pressure output pipe pressure monitoring device and the pulse pump pressure output pipe flow monitoring device;
(5) the pipeline energy accumulator absorbs partial pulse peak pressure in the filling pipeline and slowly releases the pulse peak pressure to prolong the pulse wavelength, the filling pipeline pressure, the flow of filling slurry in the filling pipeline, the shear stress and the shear rate which are prolonged by the pulse wavelength of the pipeline energy accumulator are obtained by monitoring the filling pipeline pressure monitoring device, the filling pipeline flow monitoring device and the online rheology monitoring device, and a relation curve tau-gamma of the shear stress and the shear rate of the filling slurry at the bottom of the filling pipeline at the downstream of the pipeline energy accumulator is drawn again&I.e. t1Time shear stress and shear rate relation curve tau-gamma&And calculate t1Moment yield stress tauy1Calculating and judging the sedimentation and segregation state of the filling slurry, and regulating and controlling the plunger pulse frequency f until the filling slurry is in a homogeneous conveying state;
(6) the method comprises the steps of obtaining a shear stress and shear time relation curve tau-t through an online rheological monitoring device, detecting a rheological parameter fluctuation state through the tau-t curve, calculating a fluctuation rate w and a wavelength lambda so as to analyze the disturbance degree of pulse pressure, pulse flow and plunger frequency to filling slurry in a homogeneous conveying state, and evaluating the pipeline conveying reliability, namely pulse durability.
7. The method of claim 6 for controlling the sedimentation and segregation of the mine filling slurry based on the low-frequency pulse, wherein: the method for judging the sedimentation and segregation state of the filling slurry in the step (3) or the step (5) comprises the following steps: gradient threshold i if yield stress changesτWhen the filling slurry is not less than the preset threshold value, the filling slurry is in a sedimentation and segregation state; gradient threshold i if yield stress changesτAnd when the filling slurry is smaller than the preset threshold value, the filling slurry is in a homogeneous conveying state.
8. The method of claim 7 for controlling the sedimentation and segregation of mine fill slurry based on low frequency pulses, wherein: yield stress gradient threshold iτIs calculated by the formula
iτ＝(τy1-τy0)/L
Wherein, tauy0The yield stress value is Pa corresponding to the on-line rheometer I; tau isy1The yield stress value corresponding to the on-line rheometer II is shown, and Pa and L are distances between the on-line rheometer I and the on-line rheometer II.
9. The method for controlling the sedimentation and segregation of mine filling slurry based on low-frequency pulses according to claim 7 or 8, wherein: the method for regulating and controlling the plunger pulse frequency f in the step (5) comprises the following specific steps:
1) presetting initial plunger pulse frequency f0Calculating the initial plunger pulse frequency f0Threshold value of gradient of change of yield stress ofτ；
2) Gradient threshold i if yield stress changesτLess than yield stress gradient threshold iτMaintaining the initial plunger pulse frequency f0(ii) a Gradient threshold i if yield stress changesτNot less than yield stress variation gradient threshold iτThe predetermined threshold value of (a) is then predetermined to be the growth coefficient k, let t be t +1, and f be f0+ kt, and then calculating the yield stress change gradient threshold value i when the plunger pulse frequency fτTo yield stress gradient threshold iτLess than yield stress gradient threshold iτMaintaining the plunger pulse frequency f.
10. The method of claim 6 for controlling the sedimentation and segregation of the mine filling slurry based on the low-frequency pulse, wherein: the calculation method of the fluctuation rate w and the wavelength lambda in the step (6) comprises the following steps
τmaxAt peak shear stress, τmidFor the purpose of the median shear stress,
for the moment when the maximum shear stress is the corresponding moment,
v is the average flow rate of the fill slurry for the time at which the minimum shear stress is relevant.
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| CN115127960A (en) * | 2022-06-01 | 2022-09-30 | 北京科技大学 | Online rheological test method for pipeline transportation of all-solid waste paste slurry |
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