CN110067522B - Novel magnetic separation system and method capable of being automatically adjusted - Google Patents
Novel magnetic separation system and method capable of being automatically adjusted Download PDFInfo
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- CN110067522B CN110067522B CN201910407440.1A CN201910407440A CN110067522B CN 110067522 B CN110067522 B CN 110067522B CN 201910407440 A CN201910407440 A CN 201910407440A CN 110067522 B CN110067522 B CN 110067522B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
- E21B21/065—Separating solids from drilling fluids
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/16—Applying separate balls or pellets by the pressure of the drill, so-called shot-drilling
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Abstract
The invention discloses a novel magnetic separation system and method capable of being automatically adjusted, and belongs to the technical field of petroleum drilling. The invention comprises a feeding pipeline, a magnetic separator, a dynamic flow dividing mechanism, a magnetic flux dynamic regulating mechanism and a controller, wherein the dynamic flow dividing mechanism comprises a filtering device, a liquid level monitoring assembly and a circulating tank; a throttle valve is arranged between the filtering device and the magnetic separator. The magnetic separation device has the beneficial effects that the feeding amount and the magnetic flux can be adaptively and dynamically adjusted based on the treatment amount, the magnetic separation requirements of different layers, discharge capacity, particle concentration and other working conditions are met to achieve optimal working efficiency, stable operation is ensured, the economic benefit is improved, and the applicability of a magnetic separation system is enhanced.
Description
Technical Field
The invention relates to the technical field of petroleum drilling, in particular to a novel magnetic separation system and method capable of being automatically adjusted.
Background
The particle impact drilling technology belongs to a novel front drilling technology in petroleum exploration industry, and mainly utilizes steel ball particles with the diameter of 1-3 mm to impact rock at high speed and high frequency, and the rock is broken rapidly by means of instant acting force, so that high-efficiency drilling in hard and difficult-to-drill stratum is realized. The particle impact drilling technology is applied based on a particle impact drilling system, and the particle impact drilling system mainly comprises a particle injection system and a particle separation system, wherein the particle separation system is used for separating particles from mixed slurry such as particles, drilling fluid, rock debris and the like which are returned from the bottom of a well, re-injecting the particles into the bottom of the well, and improving the utilization rate of the particles so as to realize recycling.
At present, the particle separation and recovery modes mainly comprise the following two modes: firstly, vibrating recycling, namely separating mixed slurry such as particles, drilling fluid, rock fragments and the like by utilizing a single-stage or multi-stage vibrating screen, wherein the mode is simple to realize, but the particles cannot be separated from the rock fragments with the same size, and the rock breaking efficiency of particle drilling can be influenced after long-term application; and secondly, magnetic separation type recycling, namely, utilizing the characteristic that steel ball particles can be magnetically separated, and enabling mixed slurry of particles, drilling fluid, rock debris and the like to pass through a component with magnetism so as to separate and recycle the particles. Compared with vibration type recovery, magnetic separation type recovery ensures the efficiency of particle recovery, and is more suitable for the particle drilling site at the present stage.
Factors influencing the magnetic separation effect of the magnetic separator include the flow rate and the concentration of the fed mixed slurry, such as when the concentration of the mixed slurry is too large, the viscosity of the mixed slurry is increased, the fluidity of the mixed slurry is correspondingly reduced, the excessive flow rate of the mixed slurry entering the magnetic separator chamber can increase the load of the magnetic separator, the magnetic flux of the existing magnetic separator is solid, and if the solid magnetic flux is too small, the magnetic separation effect cannot be achieved. In an actual drilling site, the formula of the drilling fluid needs to be adjusted in real time in order to adapt to different stratum conditions, and the mixed slurry returned from the well is mixed with mud scraps, mineral products and the like in different layers, so that the density, viscosity, fluidity and other characteristics of the mixed slurry are changeable; after the particles are recycled, the mass of the particle impact drilling ruler is reduced due to the fact that the proportion of intact particles is reduced, and the working efficiency is affected.
Disclosure of Invention
(one) technical purpose
Aiming at the defects of the prior art, the invention provides a novel magnetic separation system and a novel magnetic separation method capable of being automatically adjusted, which aim to realize the adjustability of the feeding treatment capacity and the magnetic separation magnetic flux of the magnetic separation system, meet the magnetic separation requirements of underground working conditions of different layers, optimize the working efficiency of the magnetic separation system and improve the applicability and the economy of the magnetic separation system.
(II) technical scheme
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a novel magnetic separation system capable of being automatically adjusted comprises a feeding pipeline and a magnetic separator, wherein the feeding pipeline is communicated with the magnetic separator; the magnetic separator comprises a frame, a magnetic separation tank body, a magnetic separation barrel, a feeding box and a discharging box, wherein the magnetic separation tank body is arranged on the frame, the magnetic separation barrel is positioned in the magnetic separation tank body and used for carrying out magnetic separation treatment on mixed slurry, the feeding box and the discharging box are arranged on the frame and positioned on two sides of the magnetic separation tank body, the feeding box is communicated with the magnetic separation tank body to convey the mixed slurry into the magnetic separation tank body, and the discharging box is used for receiving particles carried out by the magnetic separation barrel.
The novel magnetic separation system capable of being automatically adjusted further comprises a dynamic shunt mechanism, a magnetic flux dynamic adjusting mechanism and a controller; the dynamic diversion mechanism comprises a filtering device, a liquid level monitoring assembly and a circulating tank, the feeding pipeline is communicated with the filtering device, the filtering device is respectively communicated to the magnetic separator and the circulating tank, and is used for respectively conveying the filtered intact particles into the magnetic separator for recycling, and conveying the crushed particles and part of drilling fluid into the circulating tank for recycling; a throttle valve is arranged between the filtering device and the circulating tank.
The magnetic separator comprises a magnetic separator body, a liquid level monitoring assembly, a magnetic flux dynamic regulating mechanism, a controller, a liquid level monitoring assembly, a throttle valve and a magnetic flux dynamic regulating mechanism, wherein the liquid level monitoring assembly and the magnetic flux dynamic regulating mechanism are both arranged on the magnetic separator body, the controller is respectively electrically connected with the liquid level monitoring assembly, the throttle valve and the magnetic flux dynamic regulating mechanism to realize signal interaction, the liquid level monitoring assembly is used for monitoring the liquid level in the magnetic separator body, the throttle valve is used for controlling the flow rate of entering the magnetic separator body, the magnetic flux dynamic regulating mechanism is used for monitoring the rotation condition of the magnetic separator body and the particle surplus in the magnetic separator body, and the controller is used for regulating the opening of the throttle valve according to a liquid level signal to control the flow rate of mixed slurry entering the magnetic separator body and controlling the magnetic flux of the magnetic separator body to keep matching with the particle surplus.
Firstly, the throttle valve can control the flow of the mixed slurry entering the magnetic separator, specifically, the opening of the throttle valve is controlled and regulated, so that the flux of the mixed slurry entering the magnetic separator is indirectly changed by changing the flux of the shunt management where the mixed slurry enters the filtering device in the feeding pipeline, the damage to the magnetic separator caused by the overlarge flow and the damage to the magnetic separator caused by the overlarge flow are avoided, and the condition that the effective working capacity of the magnetic separator cannot be achieved due to the overlarge flow is avoided, so that the working efficiency is too low is avoided. Of course, the adjustment of the throttle valve requires a combination of magnetic separation operating conditions within the magnetic separator. Therefore, the invention can ensure that the liquid level in the magnetic separator is always in a safe range, thereby protecting the magnetic separator and optimizing the magnetic separation processing capacity.
The liquid level monitoring assembly monitors the liquid level of the mixed slurry in the magnetic separation tank body in real time, calculates and judges whether the liquid level reaches a preset high-low threshold value, controls and adjusts the opening of the throttle valve if the liquid level reaches the preset high-low threshold value, and adaptively adjusts the flow entering the magnetic separator so as to maintain the mixed slurry in the magnetic separation tank body in a proper safety range.
The magnetic flux dynamic adjusting mechanism adjusts the magnetic flux of the magnetic separation barrel to coordinate the magnetic field intensity to be matched with the residual particle quantity entering the magnetic separation groove body, specifically, the magnetic field intensity is increased when the particle residual quantity is overlarge, and the magnetic field intensity is reduced or unchanged when the particle residual quantity is smaller. It should be noted that, because the characteristics of concentration, density, fluidity, etc. in the mixed slurry are variable, the magnetic flux of the magnetic separation cylinder of the existing magnetic separator is mostly fixed, and even though the magnetic separation cylinder is partitioned, the magnetic flux of the magnetic system of each region is also fixed, so that the method can not be suitable for processing the mixed slurry with different particle ratios; when the particles in the mixed slurry are too few, the working efficiency of the magnetic separation cylinder is too high and exceeds the magnetic field strength required by the particles in the mixed slurry, so that the waste of the magnetic separation efficiency is caused; when too many particles in the mixed slurry, the working efficiency of the magnetic separation barrel cannot meet the magnetic separation requirement, all particles cannot be separated, the particles which are not separated and magnetically separated are accumulated in the magnetic separation groove body, a drilling fluid discharge pipeline can be blocked, and even the magnetic separation barrel is blocked, so that the magnetic separation work of the whole system is influenced.
The magnetic separator is based on the principle of electromagnetic induction, and the magnetic separator has a magnetic force in an energized state, and the magnitude of the magnetic field or the magnetic force is determined by the magnitude of the passing current.
Further, the liquid level monitoring assembly comprises a liquid level sensor, the liquid level sensor is arranged on the magnetic separation tank body and used for monitoring the liquid level in the magnetic separation tank body in real time, and the liquid level sensor is electrically connected with the controller to realize signal interaction.
Further, the liquid level monitoring assembly comprises a liquid level high switch and a liquid level low switch, the liquid level high switch and the liquid level low switch are both arranged on the magnetic separation tank body, the position of the liquid level high switch is higher than that of the liquid level low switch, the liquid level high switch and the liquid level low switch are respectively used for realizing the alarm of the preset high and low liquid level threshold value, and the liquid level high switch and the liquid level low switch are electrically connected with the controller to realize signal interaction.
Further, the magnetic separation barrel is provided with a plurality of magnetic separation units based on electromagnetic induction adjusting magnetic flux along the periphery, and the magnetic separation units are electrically connected with the controller to realize signal interaction.
Further, the magnetic flux dynamic adjusting mechanism comprises a magnetic separation proximity switch and a demagnetization proximity switch, wherein the magnetic separation proximity switch is arranged on the lower peripheral side of the magnetic separation barrel and is close to one side of the discharge box, the magnetic separation proximity switch is positioned at the top opening of the magnetic separation groove body, and the demagnetization proximity switch is arranged on the upper peripheral side of the magnetic separation barrel and is close to one side of the discharge box; the magnetic separation proximity switch and the demagnetizing proximity switch are electrically connected with the controller so as to realize signal interaction.
The magnetic separation units are internally provided with the identifiers, the identifiers are electrically connected with the controller to realize signal interaction, and the identifiers are used for distinguishing different magnetic separation units, so that the controller can conveniently and accurately regulate and control the magnetic flux of the corresponding magnetic separation units.
Still further, magnetic flux dynamic adjustment mechanism includes the monitoring camera, the monitoring camera with the controller electricity is connected in order to realize signal interaction, the monitoring camera orientation in the magnetic separation cell body with particle between the magnetic separation section of thick bamboo for the surplus of monitoring particle is in order to feed back to the controller.
Still further, the butt has the scraper blade ware on the magnetic separation section of thick bamboo, and the scraper blade ware is close to the discharging case and is located the discharging case upside for scrape the particle that does not demagnetize so that it gets into the discharging case.
The invention also provides a magnetic separation method, which comprises the following steps:
s1, directly feeding a part of mixed slurry into a magnetic separator, shunting the other part of mixed slurry into a filtering device for filtering, feeding the well particles and part of drilling fluid obtained by filtering into the magnetic separator again, and feeding the crushed particles and part of drilling fluid obtained by filtering into a circulating tank;
s2, monitoring real-time liquid level h in magnetic separation tank body t Modifying the opening of the throttle valve to be the opening of the throttle valve until the throttle valve reaches a preset threshold value of 1.1hh is a preset low liquid level, and the time for recording the liquid level from h to 1.1h is t 1 ，/>At t 1 Valve opening before moment;
s3, calculating preset time t at each interval 2 Acquiring the real-time liquid level h at the moment t And modifying the opening of the throttle valve to At t 2 Valve opening before moment, ++>At t 2 The liquid level before the moment;
s4, monitoring the real-time liquid level h t When the liquid level in the magnetic separation tank body does not change, namelyRecording the real-time opening p of the throttle valve at this time t ' and comparing h t And h:
if h t The real-time opening of the throttle valve is modified to be more than hUp to h t When the opening of the throttle valve is reduced to be less than h, the real-time opening of the throttle valve is modified to be p t ＝p t '；
If h t H is less than or equal to h, and no modification is performed;
s5, rotating the magnetic separation cylinder,when the magnetic separation unit rotates to the magnetic separation proximity switch, a magnetic field is generated and gradually increased, particles are adsorbed on the surface of the corresponding magnetic separation unit, and the magnetic flux is obtained by the real-time variance sigma of a preset magnetic flux attenuation curve T Adjusting; when the magnetic separation unit is rotated to the demagnetizing proximity switch, the magnetic field is turned off to demagnetize, and the particles gradually fall off and are thrown into the discharge box due to inertia generated by rotation of the magnetic separation cylinder;
in the step S3A coefficient representing the real-time adjustment of the valve opening, +.>Representing t 2 Rate of change of liquid level in time t 1 The ratio of the liquid level change rates at the moment determines the opening degree of the throttle valve according to the ratio.
Further, the real-time variance of the preset magnetic flux decay curve in the step S5 isPreset time T per interval 1 Performing curve adjustment once, and->Is T 1 Curve variance before time; the monitoring camera acquires a particle remaining amount accumulation image, and image analysis is carried out by the controller to obtain the real-time accumulation height H of particles T ，/>Is T 1 Particle deposition height before time.
Further, after the magnetic separation unit in the step S5 is turned to the magnetic separation proximity switch, the magnetic separation unit is turned for 30 degrees again, and the magnetic flux of the magnetic separation unit reaches the maximum.
(III) beneficial effects
Compared with the prior art, the invention has the beneficial effects that:
the existing magnetic separation system has no adjustment mechanism to the flow of the mixed slurry, and is easy to exceed the work load of the magnetic separator to damage the magnetic separator; secondly, the magnetic flux is fixedly selected, and the working efficiency is difficult to accurately match with the characteristic change of the mixed slurry, or the magnetic flux exceeds the load of the magnetic separator or the magnetic separator cannot achieve the magnetic separation effect; the invention can adaptively and dynamically adjust the feeding amount and the magnetic flux based on the treatment amount, meets the magnetic separation requirements of different layer sections, discharge capacity, particle concentration and other working conditions to achieve optimal working efficiency, ensures stable operation, improves economic benefit and enhances the applicability of a magnetic separation system.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a front view of the magnetic separator of the present invention;
FIG. 3 is a side view of the magnetic separator of the present invention;
FIG. 4 is a functional block diagram of the present invention;
reference numerals illustrate: 1-a feeding pipeline; 2-a filtering device; 3-throttle valve; 4-magnetic separator; 41-magnetic separation cylinder; 411-magnetic separation unit; 412-an identifier; 42-vibrator; 43-a discharge box; 44-magnetic separation groove body; 45-frames; 46-feeding box; 47-speed reducer; 48-an electric motor; 49-scraper; 51-a liquid level sensor; 52-a liquid level high switch; 53-liquid level low switch; 61-magnetic separation proximity switch; 62-demagnetizing proximity switch; 63-monitoring a camera; 7-a circulation tank; 8-level gauge.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1-4, the present invention provides a novel magnetic separation system and method with automatic adjustment.
As shown in fig. 1 to 3, the invention provides a novel magnetic separation system capable of being automatically adjusted, which comprises a feeding pipeline 1 and a magnetic separator 4, wherein the feeding pipeline 1 is communicated with the magnetic separator 4; the magnetic separator 4 comprises a frame 45, a magnetic separation tank body 44, a magnetic separation barrel 41, a feeding box 46 and a discharging box 43, wherein the magnetic separation tank body 44 is arranged on the frame 45, the magnetic separation barrel 41 is arranged in the magnetic separation tank body 44 and is used for carrying out magnetic separation treatment on mixed slurry, the feeding box 46 and the discharging box 43 are arranged on the frame 45 and are arranged on two sides of the magnetic separation tank body 44, the feeding box 46 is communicated with the magnetic separation tank body 44 to convey mixed slurry into the magnetic separation tank body 44, and the discharging box 43 is used for receiving particles carried out by the magnetic separation barrel 41. The frame 45 is also provided with a speed reducer 47 and a motor 48 which are mutually linked with the magnetic separation cylinder 41 to drive the magnetic separation cylinder 41 to rotate.
Referring to fig. 1 and 4, the magnetic flux dynamic shunt device further comprises a dynamic shunt mechanism, a magnetic flux dynamic adjustment mechanism and a controller; the dynamic diversion mechanism comprises a filtering device 2, a liquid level monitoring assembly and a circulating tank 7, wherein the feeding pipeline 1 is communicated with the filtering device 2, the filtering device 2 is respectively communicated with the magnetic separator 4 and the circulating tank 7, and is used for respectively sending the intact particles obtained by filtering into the magnetic separator 4 for recycling, and sending the broken particles and part of drilling fluid into the circulating tank 7 for recycling; a throttle valve 3 is arranged between the filtering device 2 and the circulating tank 7. In the present embodiment, the filter device 2 is preferably a vibrating screen, the diameter of which is 80% of the particle diameter, and the vibration frequency is not lower than 50HZ. Of course, other arrangements of the filter device 2 may be used.
The liquid level monitoring assembly and the magnetic flux dynamic adjustment mechanism are both arranged on the magnetic separator 4, the controller is respectively electrically connected with the liquid level monitoring assembly, the throttle valve 3 and the magnetic flux dynamic adjustment mechanism to realize signal interaction, the liquid level monitoring assembly is used for monitoring the liquid level in the magnetic separation tank body 44, the throttle valve 3 is used for controlling the flow entering the magnetic separator 4, the magnetic flux dynamic adjustment mechanism is used for monitoring the rotation condition of the magnetic separation cylinder 41 and the particle surplus in the magnetic separation tank body 44, and the controller is used for adjusting the opening of the throttle valve 3 according to the liquid level signal to control the flow of mixed slurry entering the magnetic separation tank body 44 and controlling the magnetic flux of the magnetic separation cylinder 41 to keep matching with the particle surplus.
The throttle valve 3 can control the flow rate of the mixed slurry entering the magnetic separator 4, specifically, the opening of the throttle valve 3 is controlled and regulated, so that the flow rate of the mixed slurry entering the filtering device 2 in the feeding pipeline 1 is changed, and the flow rate of the mixed slurry entering the magnetic separator 4 is indirectly changed, thereby avoiding damage to the magnetic separator 4 due to overlarge flow rate and exceeding the load of the magnetic separator 4, and avoiding too low flow rate to achieve the effective working capacity of the magnetic separator 4, and resulting in too low working efficiency. Of course, the adjustment of the throttle valve 3 needs to be combined with the magnetic separation operation in the magnetic separator 4. Therefore, the invention can ensure that the liquid level in the magnetic separator 4 is always in a safe range, thereby protecting the magnetic separator 4 and optimizing the magnetic separation processing capacity.
The liquid level monitoring assembly monitors the liquid level of the mixed slurry in the magnetic separation tank body 44 in real time, calculates and judges whether the liquid level reaches a preset high-low threshold value, controls and adjusts the opening of the throttle valve 3 if the liquid level reaches the preset high-low threshold value, and adaptively adjusts the flow entering the magnetic separator 4, specifically, when the liquid level reaches a high liquid level threshold value, the flow entering the magnetic separator 4 is reduced, and when the liquid level reaches a low liquid level, the flow entering the magnetic separator 4 is increased, so that the mixed slurry in the magnetic separation tank body 44 is maintained in a proper safety range.
The magnetic flux dynamic adjustment mechanism adjusts the magnetic flux of the magnetic separation cylinder 41 to coordinate the magnetic field intensity to match the residual particle amount entering the magnetic separation tank 44, specifically, if the particle residual amount is too large, the magnetic field intensity is increased, and if the particle residual amount is small, the magnetic field intensity is reduced or unchanged. In particular, because the characteristics of concentration, density, fluidity and the like in the mixed slurry are variable, the magnetic flux of the magnetic separation cylinder of the conventional magnetic separator 4 is mostly fixed, and even though the magnetic separation cylinder 41 is partitioned, the magnetic flux of each region is also fixed, so that the method cannot be suitable for processing the mixed slurry with different particle ratios; when the particles in the mixed slurry are too few, the working efficiency of the magnetic separation cylinder 41 is too high and exceeds the magnetic field strength required by the particles in the mixed slurry, so that the magnetic separation efficiency is wasted; when the particles in the mixed slurry are too many, the working efficiency of the magnetic separation cylinder 41 cannot meet the magnetic separation requirement, all the particles cannot be separated, the particles which are not separated and magnetically separated are accumulated in the magnetic separation groove 44, the drilling fluid discharge pipeline can be blocked, and even the magnetic separation cylinder 41 is blocked, so that the magnetic separation work of the whole system is affected.
Referring to fig. 1 and 2, the liquid level monitoring assembly includes a liquid level sensor 51, where the liquid level sensor 51 is disposed on the magnetic separation tank 44 and is used for monitoring the liquid level in the magnetic separation tank 44 in real time, and the liquid level sensor 51 is electrically connected with the controller to realize signal interaction. The level monitoring assembly monitors the level of liquid in magnetic separation tank 44 by means of a liquid level sensor 51, preferably a continuous liquid level sensor. When the controller receives a feedback signal that the liquid level sensor 51 reaches a preset high-low liquid level threshold value, the controller calculates according to the liquid level height, and modifies and adjusts the opening of the throttle valve 3 according to the calculation result (the liquid level is too high, the opening is increased, the flow entering the magnetic separator 4 is indirectly reduced, the liquid level is too low, the opening is reduced, the flow entering the magnetic separator 4 is indirectly increased), and the flow entering the magnetic separator 4 is adaptively adjusted so as to maintain the mixed slurry in the magnetic separation tank 44 in a proper safety range, namely, the particle occupation ratio is in a proper interval, so that the magnetic separation load of the magnetic separator 4 can be matched, and stable operation is realized; of course, the controller can also send a command to the alarm to realize alarm at the preset high and low liquid level threshold.
Referring to fig. 1 and 2, the liquid level monitoring assembly includes a liquid level high switch 52 and a liquid level low switch 53, the liquid level high switch 52 and the liquid level low switch 53 are both disposed on the magnetic separation tank 44, the position of the liquid level high switch 52 is higher than that of the liquid level low switch 53, the liquid level high switch 52 and the liquid level low switch 53 are respectively used for realizing the alarm of the preset high and low liquid level threshold, and the liquid level high switch 52 and the liquid level low switch 53 are electrically connected with the controller to realize signal interaction. The high level switch 52 and the low level switch 53 can also send signals to respond to alarms, and can serve as a backup level detection function when the level sensor 51 is in a fault state.
Referring to fig. 1, the magnetic separation drum 41 is provided with a plurality of magnetic separation units 411 for adjusting magnetic flux based on electromagnetic induction along the circumferential side, and the magnetic separation units 411 are electrically connected with the controller to realize signal interaction. The magnetic separator 4 is based on the principle of electromagnetic induction, and the magnetic separation unit 411 has a magnetic force in the energized state, and the magnitude of the generated magnetic field or the magnitude of the magnetic force is determined by the magnitude of the passing current, and different combinations of magnetic fields can be generated. The selection principle of the magnetic separation unit 411 is as follows: the magnetic flux is adjustable between 0 and 3000GS, and the resolution is better than 100GS. In this embodiment, the magnetic separation units 411 are preferably eight, but may be other numbers and are all within the scope of the present invention.
As shown in fig. 1 to 3, the magnetic flux dynamic adjustment mechanism includes a magnetic separation proximity switch 61 and a demagnetizing proximity switch 62, the magnetic separation proximity switch 61 is disposed on the lower peripheral side of the magnetic separation drum 41 and is close to the discharge box 43, the magnetic separation proximity switch 61 is disposed at the top opening of the magnetic separation tank 44, and the demagnetizing proximity switch 62 is disposed on the upper peripheral side of the magnetic separation drum 41 and is close to the discharge box 43; the magnetic separation proximity switch 61 and the demagnetizing proximity switch 62 are electrically connected with the controller to realize signal interaction.
The magnetic separation units 411 are provided with identifiers 412, the identifiers 412 are electrically connected with the controller to realize signal interaction, and the identifiers 412 are used for sensing the magnetic separation proximity switch 61 and the demagnetizing proximity switch 62 to feed back to the controller to regulate and control the magnetic flux of the magnetic separation units 411.
When approaching the magnetic separation proximity switch 61 and the demagnetizing proximity switch 62, the magnetic separation unit 411 sends signals to the magnetic separation proximity switch 61 and the demagnetizing proximity switch 62 and feeds the signals back to the controller. As shown in fig. 1 and 3, when the magnetic separation unit 411 is switched to the magnetic separation proximity switch 61, the magnetic separation proximity switch 61 feeds back a signal to the controller, the controller controls the signal fed back by the identifier of the magnetic separation unit 411 to accurately determine which magnetic separation unit 411 is, and controls a circuit in the magnetic separation unit 411 to be electrified to generate a magnetic field, the magnetic flux gradually increases from 0, magnetic separation is started on particles, and the particles are adsorbed on the surface of the magnetic separation cylinder 41; then, the magnetic separation unit 411 rotates in the middle of the magnetic separation tank 44 to magnetically separate and adsorb the main stacking position of the particles, the magnetic separation unit 411 adsorbs the particles to rotate through the top of the magnetic separation cylinder 41, and in the process, the magnetic flux in the magnetic separation unit 411 gradually decays; when the magnetic separation unit 411 is turned to the demagnetizing proximity switch 62, the demagnetizing proximity switch 62 feeds back a signal to the controller, the controller controls no current to flow to the circuit in the magnetic separation unit 411, the magnetic flux is 0, the magnetic field disappears, the particles start to demagnetize, and the particles are thrown into and out of the feed box 43 due to inertia of the magnetic separation cylinder 41 during rotation.
The existing magnetic separator has the defects that the magnetic separation cylinder always has a magnetic field, a certain amount of magnetic force exists on particles, and the particles are seriously agglomerated due to the magnetic force, so that magnetic clusters are formed. Compared with the existing magnetic separator, the magnetic separator has the advantages that the particles are required to be demagnetized after magnetic separation, and a special demagnetizer is required to be installed. The magnetic flux of the magnetic separation unit 411 is reduced to 0, so that the magnetic separation barrel 41 is not magnetic, particles fall off from the magnetic separation barrel 41, the particles are not provided with magnetic force or can have trace magnetic force, small magnetic clusters with trace magnetic force can be left, the particles fall on the shell of the discharge box 43 to be separated, and the problem of particle agglomeration can be avoided. Therefore, the invention does not need to arrange a demagnetizer at the follow-up of the magnetic separator 4, saves cost, reduces working procedures and improves the whole demagnetizing efficiency.
Referring to fig. 1 and 3, the magnetic flux dynamic adjustment mechanism includes a monitoring camera 63, the monitoring camera 63 is electrically connected with the controller to implement signal interaction, the monitoring camera 63 faces the particles between the magnetic separation tank 44 and the magnetic separation drum 41, and is used for monitoring the residual quantity of the particles to feed back to the controller. The monitoring camera 63 transmits the photographed image to the controller, obtains the remaining amount of particles from the image analysis, and adjusts the magnetic flux of the magnetic separation unit 411 according to the remaining amount of particles. Specifically, if the accumulation amount of the residual particles is large, the internal circuit current of the magnetic separation unit 411 is increased, the magnetic flux is increased, more particles are magnetically separated and adsorbed, and the excessive accumulation of the particles is avoided to block the magnetic separation tank 44; otherwise, if the accumulation amount of the residual particles is small, the internal circuit current of the magnetic separation unit 411 can be reduced, the magnetic flux is reduced, the adsorption amount of the particles is reduced, the particle amount in the magnetic separation tank 44 is in a proper stable range, the energy consumption of the magnetic separator is reduced, and the economical efficiency of the whole magnetic separation system is improved.
Referring to fig. 2 and 3, preferably, the magnetic separation drum 41 is abutted with a scraper 49, and the scraper 49 is near the discharge bin 43 and located on the upper side of the discharge bin 43, and is used for scraping non-demagnetized particles so as to enter the discharge bin 43. Since even if the magnetic flux of the magnetic separation unit 411 becomes 0, the residual minute amount of magnetic force on the particles becomes small magnetic clusters and adheres to the magnetic separation unit 411, when the magnetic separation unit 411 rotates to the scraper 49, the magnetic clusters are scraped off by the scraper 49 and fall into the discharge bin 43.
Further improved, as shown in fig. 1, the magnetic separator 4 is further led out and provided with a liquid level meter 8 for displaying the liquid level in the magnetic separation tank 44, so that an operator can observe the liquid level change more intuitively.
Further, as shown in fig. 2, a vibrator 42 is provided on the discharge box 43 to vibrate the discharge box 43 so that particles are smoothly discharged from the discharge box 43.
The invention also provides a magnetic separation method, which comprises the following specific steps:
s1, directly feeding a part of mixed slurry into a magnetic separator 4, shunting the other part of mixed slurry into a filtering device 2 for filtering, feeding the filtered intact particles and part of drilling fluid into the magnetic separator 4 again, and feeding the filtered broken particles and part of drilling fluid into a circulating tank 7;
s2, monitoring real-time liquid level h in magnetic separation tank 44 t Modifying the opening of the throttle valve 3 to be the same as the opening of the throttle valve until the throttle valve reaches the preset threshold value of 1.1hh is a preset low liquid level, and the time for recording the liquid level from h to 1.1h is t 1 ，/>At t 1 Valve opening before moment;
s3, calculating preset time t at each interval 2 Acquiring the real-time liquid level h at the moment t And modifying the opening of the throttle valve 3 to At t 2 Valve opening before moment, ++>At t 2 The liquid level before the moment;
s4, monitoring the real-time liquid level h t When the liquid level in the magnetic separation tank 44 does not change, i.eThe real-time opening p of the throttle valve 3 at this time is recorded t ' and comparing h t And h:
if h t > h, modifying the real-time opening of the throttle valve 3 toUp to h t Down to h or belowThe real-time opening degree of the throttle valve 3 is modified to p t ＝p t '；
If h t H is less than or equal to h, and no modification is performed;
s5, rotating the magnetic separation cylinder 41, generating a magnetic field and gradually increasing the magnetic field when the magnetic separation unit 411 rotates to the magnetic separation proximity switch 61, adsorbing particles on the surface of the corresponding magnetic separation unit 411, and enabling the magnetic flux to be obtained by the real-time variance sigma of a preset magnetic flux attenuation curve T Adjusting; when the magnetic separation unit 411 is rotated to the demagnetizing proximity switch 62, the magnetic field is turned off to demagnetize, and the particles gradually fall off and are thrown into the discharge box 43 due to inertia generated by rotation of the magnetic separation barrel 41;
in the step S3A coefficient representing the real-time adjustment of the valve opening, +.>Representing t 2 Rate of change of liquid level in time t 1 The ratio of the time liquid level change rates determines the opening degree of the throttle valve 3 according to the ratio.
The real-time variance of the preset magnetic flux attenuation curve in the step S5 isPreset time T per interval 1 Performing curve adjustment once, and->Is T 1 Curve variance before time; the monitoring camera 63 acquires a particle remaining amount accumulation image, and image analysis is performed by the controller to obtain a real-time accumulation height H of particles T ，/>Is T 1 Particle deposition height before time. The magnetic separation unit 411 is switched from the magnetic separation proximity switch 61 to the demagnetization proximity switch 62, the decay curve of the magnetic flux of the magnetic separation unit 411 approximates to a normal distribution curve, and the decay curve is increased firstAnd is greatly reduced. Further, it is defined that by modifying the magnetic flux decay curve, after the magnetic separation unit 411 rotates to the magnetic separation proximity switch 61 in the step S5, the magnetic flux reaches the maximum by rotating by 30 °, and the magnetic separation unit 411 is located at the position of the maximum particle accumulation, so that the magnetic separation adsorption is most suitable for the particles.
Claims (9)
1. A magnetic separation method is characterized in that: the novel magnetic separation system capable of being automatically adjusted is adopted, the magnetic separation system comprises a feeding pipeline (1) and a magnetic separator (4), and the feeding pipeline (1) is communicated with the magnetic separator (4); the magnetic separator (4) comprises a frame (45), a magnetic separation tank body (44), a magnetic separation barrel (41), a feeding box (46) and a discharging box (43), wherein the magnetic separation tank body (44) is arranged on the frame (45), the magnetic separation barrel (41) is positioned in the magnetic separation tank body (44) and is used for carrying out magnetic separation treatment on mixed slurry, the feeding box (46) and the discharging box (43) are arranged on the frame (45) and are positioned at two sides of the magnetic separation tank body (44), the feeding box (46) is communicated with the magnetic separation tank body (44) so as to convey mixed slurry into the magnetic separation tank body (44), and the discharging box (43) is used for receiving particles carried out by the magnetic separation barrel (41);
the device also comprises a dynamic shunt mechanism, a magnetic flux dynamic adjusting mechanism and a controller; the dynamic diversion mechanism comprises a filtering device (2), a liquid level monitoring assembly and a circulating tank (7), wherein the feeding pipeline (1) is communicated with the filtering device (2), the filtering device (2) is respectively communicated to the magnetic separator (4) and the circulating tank (7), and is used for respectively conveying the intact particles obtained by filtering into the magnetic separator (4) for recycling, and conveying the broken particles and part of drilling fluid into the circulating tank (7) for recycling; a throttle valve (3) is arranged between the filtering device (2) and the circulating tank (7);
the magnetic separator comprises a magnetic separator body (44), a liquid level monitoring assembly, a magnetic flux dynamic regulating mechanism, a controller, a throttle valve (3) and a magnetic flux dynamic regulating mechanism, wherein the liquid level monitoring assembly and the magnetic flux dynamic regulating mechanism are both arranged on the magnetic separator (4), the controller is respectively electrically connected with the liquid level monitoring assembly, the throttle valve (3) and the magnetic flux dynamic regulating mechanism to realize signal interaction, the liquid level monitoring assembly is used for monitoring the liquid level in the magnetic separator body (44), the throttle valve (3) is used for controlling the flow entering the magnetic separator (4), the magnetic flux dynamic regulating mechanism is used for monitoring the rotation condition of the magnetic separator cylinder (41) and the particle residual quantity in the magnetic separator body (44), and the controller is used for regulating the opening of the throttle valve (3) according to the liquid level signal to control the flow of mixed slurry entering the magnetic separator body (44) and controlling the magnetic flux of the magnetic separator cylinder (41) to keep matching with the particle residual quantity;
the magnetic separation method comprises the following specific steps:
s1, directly feeding a part of mixed slurry into a magnetic separator (4), shunting the other part of mixed slurry into a filtering device (2) for filtering, feeding the filtered intact particles and part of drilling fluid into the magnetic separator (4) again, and feeding the filtered broken particles and part of drilling fluid into a circulating tank (7);
s2, monitoring real-time liquid level h in magnetic separation tank body (44) t Modifying the opening of the throttle valve (3) to be the opening of the throttle valve when the throttle valve reaches the preset threshold value of 1.1hh is a preset low liquid level, and the time for recording the liquid level from h to 1.1h is t 1 ，/>At t 1 Valve opening before moment;
s3, calculating preset time t at each interval 2 Acquiring the real-time liquid level h at the moment t And modifying the opening of the throttle valve (3) to At t 2 Valve opening before moment, ++>At t 2 The liquid level before the moment;
s4, monitoring the real-time liquid level h t When the liquid level in the magnetic separation tank body (44) does not change, namelyRecording the real-time opening p of the throttle valve (3) at this time t ' and comparing h t And h:
if h t > h, modifying the real-time opening of the throttle valve (3) to beUp to h t When the opening of the throttle valve (3) is reduced to be less than h, the real-time opening of the throttle valve (3) is modified to be p t ＝p t '；
If h t H is less than or equal to h, and no modification is performed;
s5, rotating the magnetic separation cylinder (41), generating a magnetic field and gradually increasing the magnetic field when the magnetic separation unit (411) rotates to the magnetic separation proximity switch (61), adsorbing particles on the surface of the corresponding magnetic separation unit (411), wherein the magnetic flux is obtained by presetting the real-time variance sigma of the magnetic flux attenuation curve T Adjusting; when the magnetic separation unit (411) rotates to the demagnetizing proximity switch (62), the magnetic field is turned off to demagnetize, and particles gradually fall off and are thrown into the discharge box (43) due to inertia generated by rotation of the magnetic separation barrel (41);
in the step S3A coefficient representing the real-time adjustment of the valve opening, +.>Representing t 2 Rate of change of liquid level in time t 1 The ratio of the liquid level change rates at the moment determines the opening degree of the throttle valve (3) according to the ratio.
2. The magnetic separation process of claim 1, wherein: the liquid level monitoring assembly comprises a liquid level sensor (51), the liquid level sensor (51) is arranged on the magnetic separation tank body (44) and is used for monitoring the liquid level in the magnetic separation tank body (44) in real time, and the liquid level sensor (51) is electrically connected with the controller to realize signal interaction.
3. The magnetic separation process of claim 1, wherein: the liquid level monitoring assembly comprises a liquid level high switch (52) and a liquid level low switch (53), the liquid level high switch (52) and the liquid level low switch (53) are both arranged on the magnetic separation tank body (44), the position of the liquid level high switch (52) is higher than that of the liquid level low switch (53), the liquid level high switch (52) and the liquid level low switch (53) are respectively used for realizing the alarm of the preset high and low liquid level threshold value, and the liquid level high switch (52) and the liquid level low switch (53) are both electrically connected with the controller to realize signal interaction.
4. The magnetic separation process of claim 1, wherein: the magnetic separation barrel (41) is provided with a plurality of magnetic separation units (411) based on electromagnetic induction magnetic flux adjustment along the periphery, and the magnetic separation units (411) are electrically connected with the controller to realize signal interaction.
5. The magnetic separation process of claim 4, wherein: the magnetic flux dynamic adjusting mechanism comprises a magnetic separation proximity switch (61) and a demagnetization proximity switch (62), wherein the magnetic separation proximity switch (61) is arranged on the lower peripheral side of the magnetic separation barrel (41) and is close to one side of the discharge box (43), the magnetic separation proximity switch (61) is positioned at the top opening of the magnetic separation groove body (44), and the demagnetization proximity switch (62) is positioned on the upper peripheral side of the magnetic separation barrel (41) and is close to one side of the discharge box (43); the magnetic separation proximity switch (61) and the demagnetizing proximity switch (62) are electrically connected with the controller so as to realize signal interaction;
the magnetic separation units (411) are internally provided with identifiers (412), the identifiers (412) are electrically connected with the controller to realize signal interaction, and the identifiers (412) are used for distinguishing different magnetic separation units (411), so that the controller can conveniently and accurately regulate and control the magnetic flux of the corresponding magnetic separation units (411).
6. The magnetic separation process of claim 5, wherein: the magnetic flux dynamic adjustment mechanism comprises a monitoring camera (63), wherein the monitoring camera (63) is electrically connected with the controller to realize signal interaction, the monitoring camera (63) faces particles between the magnetic separation groove body (44) and the magnetic separation barrel (41) and is used for monitoring the residual quantity of the particles to feed back to the controller.
7. The magnetic separation process according to any one of claims 4 to 6 wherein: the magnetic separation barrel (41) is abutted with a scraper (49), and the scraper (49) is close to the discharge box (43) and is positioned on the upper side of the discharge box (43) and used for scraping non-demagnetized particles so as to enable the particles to enter the discharge box (43).
8. The magnetic separation process of claim 1, wherein: the real-time variance of the preset magnetic flux attenuation curve in the step S5 isPreset time T per interval 1 Performing curve adjustment once, and->Is T 1 Curve variance before time; a monitoring camera (63) acquires a particle remaining amount accumulation image, and the image analysis is carried out by a controller to obtain the real-time accumulation height H of particles T ，/>Is T 1 Particle stacking height before time.
9. The magnetic separation process of claim 1, wherein: and in the step S5, after the magnetic separation unit (411) rotates to the magnetic separation proximity switch (61), the magnetic separation unit rotates for 30 degrees again, and the magnetic flux reaches the maximum.
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