CN105665156A - Coal leakage preventing system for coal preparation equipment and coal preparation equipment - Google Patents
Coal leakage preventing system for coal preparation equipment and coal preparation equipment Download PDFInfo
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- CN105665156A CN105665156A CN201610191067.7A CN201610191067A CN105665156A CN 105665156 A CN105665156 A CN 105665156A CN 201610191067 A CN201610191067 A CN 201610191067A CN 105665156 A CN105665156 A CN 105665156A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C7/00—Apparatus not provided for in group B04C1/00, B04C3/00, or B04C5/00; Multiple arrangements not provided for in one of the groups B04C1/00, B04C3/00, or B04C5/00; Combinations of apparatus covered by two or more of the groups B04C1/00, B04C3/00, or B04C5/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C11/00—Accessories, e.g. safety or control devices, not otherwise provided for, e.g. regulators, valves in inlet or overflow ducting
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Abstract
The invention discloses a coal leakage preventing system for coal preparation equipment and the coal preparation equipment. The coal leakage preventing system comprises a detection unit, a branch pipe and a control valve, and a bottom flow mouth communicates with or is disconnected from the input end of the branch pipe and a bottom flow pipe through the control valve; when the detection unit detects that decompression of a pressured two-product dense medium cyclone occurs, the control valve is controlled to enable the bottom flow mouth to communicate with the input end of the branch pipe and disconnect the bottom flow mouth from the bottom flow pipe; when the detection unit detects that decompression of the pressured two-product dense medium cyclone stops, the control valve is controlled to disconnect the bottom flow mouth from the input end of the branch pipe and enable the bottom flow mouth to communicate with the bottom flow pipe. According to the coal leakage preventing system and the coal preparation equipment, leaked coal is recycled when decompression of the pressured two-product dense medium cyclone occurs, and the system operation technology is recovered to the normal state after the decompression state returns to the normal state.
Description
Technical field
The present invention relates to coal separation correlative technology field, particularly the race coal measures that prevents of a kind of coal separation equipment is united and coal separation equipment.
Background technology
Dense-medium cyclone is a kind of equipment utilizing centrifuge field strengthening fine fraction ore particle sorting in dense medium, and the difficult choosing of density difference little (± 0.1 content is big) can be made to select fine also can obtain accurate sorting with extremely difficulty. This device structure is simple, movement-less part, efficiency of separation height. For coal preparation industry, the material size upper limit of dense-medium cyclone can reach 50mm, and effective lower limit of separation can reach 0.1mm, and the change along with swirler specifications parameter, and its material size and lower limit of separation can change to some extent. When sorting Bed for Fine Coal, the possible deviation E=0.02-0.06 of dense-medium cyclone, efficiency of separation height, meanwhile, due to the adjustability of its sorting density, industrial can taking off with it removes pyrite in coal sulphur.
By continuous development, dense-medium cyclone can be divided into two series, two kinds of toolings: can be divided into two products and three products two series according to product category, namely requires once to produce two kinds (cleaned coal and spoils) and three kinds of (cleaned coal, middle coal and spoil) products for different ature of coal and user. When coal preparation industry tooling, pressurized feeding and unpressurized feeding two kinds of modes can be divided into again according to coal and to the difference that quality product requires, after coal and dense medium are mixed by pressurized feeding, swirler is fed by pump or level pressure mode, and unpressurized feeding is material directly feeds swirler under passive state, decrease pump to the pulverizing of material, the granularity upper limit of material can be added to again.
Dense medium suspension and coal block (generally its granularity is less than 50mm) mixed material must be squeezed in dense-medium cyclone device chamber by an impeller pump by dense-medium cyclone before work, and pump enters the tangent line direction of direction along cone-shaped cavity, since like this, mixture just can rotate along swirler internal chamber wall. Meanwhile, dense-medium cyclone generally tilts to install, and swirler axis and horizontal sextant angle are 10 °, and down, overflow mouth is upward for underflow mouth.
When mixture rotates in swirler chamber, it is subject to gravity to be separated with the effect of centrifugal force, it is greater than the spoil of density of suspending liquid, the direction of suffered reactive force is identical with centrifugal acceleration direction, makes centrifugal motion in suspension, concentrates on outer formation waste pack, due to hindered falling effect, what be close to wall is big spoil, is secondly medium size, small grain size spoil, merges into spiral motion and discharges by underflow mouth along wall.It is less than the coal of density of suspending liquid, swirler is done centripetal motion, and concentrate on and form middle coal and cleaned coal band in swirling motion near the central shaft of swirler, near upflow tube, owing to two sortings occur the eddy effect bottom overflow, cleaned coal is discharged along upflow tube, middle coal and spoil are by eddy flow again, middle ribbing is play every grid effect between light particle and heavy particle, and the middle coal that this place can make ash content lower, to the motion of underflow mouth direction, is discharged as tail coal or discharged along upflow tube with cleaned coal. therefore, in dense-medium cyclone working process, material is subject to centrifugal force in device chamber, the three kinds of power effects of the gravity of the buoyancy of suspension and material self, due to the difference of material population density, centrifugal force suffered by it, buoyancy also can be different, by the interaction of two kinds of power, material is separated according to density difference, by the action of gravity of material self, heavy product material is moved downward along inclinator chamber, discharge eventually through underflow mouth, and upwards move under the effect that low density concentrate product is inhaled in device chamber, discharge eventually through overflow mouth, therefore, material passes through the interaction of three kinds of power in swirler, finally determine its whereabouts.
Generally, coal separating plant, when technological design, just needs according to raw coal size composition, density composition, argillization characteristic and to key elements such as the specification of quality of product, and dense medium swirler carries out type selecting and mounting process designs. dense-medium cyclone after installing, in working process, different according to ature of coal, by adjusting into material pump rotating speed and enter to expect that solid-to-liquid ratio adjusts separating effect, generally, feed pressure during dense-medium cyclone normal operation is 1.3Kpa, but when there being pressure two product dense-medium cyclone to start and when accident is stopped suddenly, owing to the viscosity of dense medium suspension is higher, during startup, swirler enters to expect that pump rotating speed to be reached set(ting)value and need the regular hour, and when stopping suddenly, enter to expect that pump can stop in unexpected power-off, cause the unexpected decompression of material in dense-medium cyclone, above-mentioned two situations all can cause material in dense-medium cyclone chamber to discharge from underflow mouth by deadweight, thus cause cleaned coal to lose, this kind of phenomenon is very general in dense-medium cyclone uses.
With regard to god China god east washing center Ulan Mulun coal separating plant; its smalls system adopts import KrebsD48 " φ (diameter 1200mm) has pressure two product dense-medium cyclones; and enter to expect that pump adopts import MM400-D43U swirler to enter to expect pump; motor adopts 500KW model to be the frequency converting speed regulating three-phase asynchronous electromotor of YPT450-6; often there will be underflow mouth in actual applications runs coal phenomenon; by on-the-spot observation analysis, and the reason occurring dense-medium cyclone underflow mouth to run coal phenomenon in system is summarized as follows:
1, during emergency shutdown, along with dense-medium cyclone enters to expect the unexpected power-off of pump, stop rapidly under entering to expect the recoil resistance of pump impeller material in feeding pipe road, and in swirler chamber, remain the disappearance of material along with feed pressure, centrifugal force in three kinds of reactive forces that material is suffered in device chamber disappears gradually, in device chamber, material changes kinestate under gravity gradually, spiral motion destroys gradually, then the downward direct motion of gravitate, in chamber, material is under gravity along with underflow mouth is run out of, thus is formed and run coal accident.
2, when accident opens car, owing to there being part coal in dense medium mixing tank after emergency shutdown, along with dense-medium cyclone enters to expect that the rotating speed of pump raises gradually, material enters in swirler device chamber by pipeline, but owing to dense medium suspension viscosity is higher, particularly the emergency shutdown time is more long, mixing tank inner suspension liquid sedimentation is more obvious, it is more big that swirler enters impeller drag when expecting pump startup, it is more long (for Ulan Mulun coal separating plant that swirler enters to expect that pump reaches specified speed required time, car is opened after 30 minutes at emergency shutdown, dense-medium cyclone reaches the normal speed time and is about 30 seconds), enter to expect that the material in swirler chamber squeezed into by pump with swirler, owing to feed pressure is not enough, in three kinds of suffered power, centrifugal force is less, vortex motion cannot be formed in device chamber, more cannot inhale effect in being formed in device chamber, therefore, this partial material is under gravity along the downward direct motion in device chamber, in chamber, material is under gravity along with underflow mouth is run out of, thus formed and run coal accident.
Summary of the invention
Based on this, it is necessary to for prior art when employing has pressure two product dense-medium cyclones decompression state occur, it is easy to cause the technical problem running coal, it is provided that the race coal measures that prevents of a kind of coal separation equipment is united and coal separation equipment.
The present invention provides the race coal measures that prevents of a kind of coal separation equipment to unite, described coal separation equipment includes pressure two product dense-medium cyclones, described have the underflow mouth of pressure two product dense-medium cyclones to be connected with underflow pipe, described prevent running coal measures system and comprise: detecting unit, arm and control valve, described underflow mouth by described control valve respectively input terminus and described underflow pipe with described arm be connected or disconnect;
When there being pressure two product dense-medium cyclone decompression state to occur described in described detecting unit detects, control the input terminus that described control valve is connected described underflow mouth and described arm, and disconnect described underflow mouth and described underflow pipe;
When there being pressure two product dense-medium cyclone decompression recovering state described in described detecting unit detects, control the input terminus that described control valve disconnects described underflow mouth and described arm, and it is connected described underflow mouth and described underflow pipe.
Further, described coal separation equipment also comprises entering to expect pump with the described swirler having the feeding mouth of pressure two product dense-medium cyclones to be connected, described detecting unit detects described swirler and enters to expect the frequency of pump, when described swirler enters to expect that the frequency of pump is lower than default decompression state occurrence frequency threshold value, pressure two product dense-medium cyclone decompression state is had to occur described in then judging, when described swirler enters to expect that the frequency of pump is higher than default decompression recovering state frequency threshold, then there are pressure two product dense-medium cyclone decompression recovering states described in judging.
Further, also comprising and it is arranged on the frequency sensor that described swirler enters to expect pump, the output terminal of described frequency sensor is connected with the input end signal of described detecting unit.
Further, the feed pressure in pressure two product dense-medium cyclones is had described in the detection of described detecting unit, when described feed pressure is lower than default decompression state generation pressure threshold, pressure two product dense-medium cyclone decompression state is had to occur described in then judging, when described feed pressure is higher than default decompression recovering state pressure threshold, then there are pressure two product dense-medium cyclone decompression recovering states described in judging.
Further, described in have the feeding mouth of pressure two product dense-medium cyclones that the pressure transmitter for detecting feed pressure is set, the output terminal of described pressure transmitter communicates to connect with described detecting unit.
Further, described swirler enters to expect that valve has the feeding mouth of pressure two product dense-medium cyclones to be connected with described to the discharge port of pump by entering to expect, described swirler enters to expect that the discharge port of pump is also connected with described time charging basket by self-circulation valve;
When there being pressure two product dense-medium cyclone decompression state to occur described in described detecting unit detects, enter described in control and expect that valve cuts out, control described self-circulation valve and open;
When there being pressure two product dense-medium cyclone decompression recovering state described in described detecting unit detects, enter described in control and expect that valve is opened, control described self-circulation valve and close.
Further, described cleaned coal scalping screen is also provided with cleaned coal baffle-box, and the output terminal of described arm is connected with the cleaned coal baffle-box of described cleaned coal scalping screen.
Further, described coal separation equipment also comprises back charging basket and swirler enters to expect pump, described swirler enters to expect that the discharge port of pump has the feeding mouth of pressure two product dense-medium cyclones to be connected with described, described time with described swirler, charging basket enters to expect that the material sucking port of pump is connected, and the output terminal of described arm is connected with described time charging basket.
Further, described control valve comprises the first Controlling solenoid valve and the 2nd Controlling solenoid valve, described underflow mouth is connected by described first Controlling solenoid valve with the input terminus of described arm or disconnects, and described underflow mouth is connected with described underflow pipe by described 2nd Controlling solenoid valve or is disconnected;
When there being pressure two product dense-medium cyclone decompression state to occur described in described detecting unit detects, control described first Controlling solenoid valve and open, and control described 2nd Controlling solenoid valve closedown;
When there being pressure two product dense-medium cyclone decompression recovering state described in described detecting unit detects, control described first Controlling solenoid valve and close, and control described 2nd Controlling solenoid valve and open.
The present invention provides a kind of coal separation equipment, includes pressure two product dense-medium cyclones, described in have the underflow mouth of pressure two product dense-medium cyclones to be connected with underflow pipe, also comprise and prevent race coal measures from uniting foregoing.
The present invention is by there being pressure two product dense-medium cyclones to carry out decompression state-detection, the connection with decompression recovering state control underflow mouth and underflow pipe is there is in decompression state, thus reclaimed by the race coal having pressure two product dense-medium cyclones under decompression state, and after decompression recovering state is normal, system cloud gray model technique is recovered normal.
Accompanying drawing explanation
Fig. 1 is the structural representation preventing race coal measures system of a kind of coal separation equipment of the present invention;
Fig. 2 is that the present invention prevents the workflow diagram running coal measures system;
Fig. 3 is the structural representation preventing race coal measures system of another embodiment of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described in detail.
What be illustrated in figure 1 a kind of coal separation equipment of the present invention prevents the structural representation running coal measures system, described coal separation equipment includes pressure two product dense-medium cyclones 1, described have the underflow mouth 11 of pressure two product dense-medium cyclones 1 to be connected with underflow pipe 3, described prevent running coal measures system and comprise: detecting unit, arm 2 and control valve 4, described underflow mouth 11 by described control valve 4 respectively input terminus and described underflow pipe 3 with described arm 2 be connected or disconnect;
As shown in Figure 2, its detecting step is:
Step S201, when there being pressure two product dense-medium cyclone decompression state to occur described in described detecting unit detects, controls described control valve 4 and is connected the input terminus of described underflow mouth 11 with described arm 2, and disconnect described underflow mouth 11 and described underflow pipe 3;
Step S202, when there being pressure two product dense-medium cyclone decompression recovering state described in described detecting unit detects, controls described control valve 4 and disconnects the input terminus of described underflow mouth 11 with described arm 2, and be connected described underflow mouth 11 and described underflow pipe 3.
This Controlling System and technological design have pressure two product dense-medium cyclones decompression under specific circumstances to cause underflow mouth to run coal problem for insoluble at present, devising and a kind of adopt program Automatic Detection and Control, reclaimed the device running coal by technological design, namely design has been invented and a kind of has been prevented dense-medium cyclone underflow from running the system of coal and technique.
The present invention is made up of two parts, the technique recovery system being respectively detecting unit and being made up of arm 2 and control valve 4.
Detecting unit is preferably micro-chip, and the effect of detecting unit is: have pressure two product dense-medium cyclones whether under decompression state by detection, and whether decompression state is recovered, and carrys out the operation of Controlling Technology recovery system with this.
The effect of technique recovery system is: by technological design, in conjunction with the signal that detecting and controlling system transmits, is reclaimed by the race coal having pressure two product dense-medium cyclones under decompression state, and after decompression recovering state is normal, system cloud gray model technique is recovered normal.
The present invention is by there being pressure two product dense-medium cyclones to carry out decompression state-detection, the connection with decompression recovering state control underflow mouth and underflow pipe is there is in decompression state, thus reclaimed by arm by the race coal having pressure two product dense-medium cyclones under decompression state, and after decompression recovering state is normal, system cloud gray model technique is recovered normal.
Wherein in an embodiment, described coal separation equipment also comprises entering to expect pump with the described swirler having the feeding mouth 13 of pressure two product dense-medium cyclones to be connected, described detecting unit detects described swirler and enters to expect the frequency of pump, when described swirler enters to expect that the frequency of pump is lower than default decompression state occurrence frequency threshold value, pressure two product dense-medium cyclone decompression state is had to occur described in then judging, when described swirler enters to expect that the frequency of pump is higher than default decompression recovering state frequency threshold, then there are pressure two product dense-medium cyclone decompression recovering states described in judging.
In view of having, pressure two product dense-medium cyclone 1 itself is unpowered, its material power resources enter to expect pump in swirler, and have the decompression state of pressure two product dense-medium cyclones 1 and swirler to enter to expect that the rotating speed (frequency) of pump has direct relation, therefore, the present embodiment, enters to expect that the rotating speed (frequency) of pump is set as detected object by swirler. Generally, swirler enters to expect that the rotating speed (frequency) of pump has set(ting)value when normal operation, therefore, this set(ting)value can be used as the control criterion of detecting unit, it is possible to decompression state occurrence frequency threshold value and decompression recovering state frequency threshold are all set as this set(ting)value. When detecting normal operation in real time by detecting unit, swirler enters to expect rotating speed (frequency) numerical value of pump, contrast with set(ting)value, when detecting numerical value lower than set(ting)value, detecting unit starts sequence of control immediately, by the valve arranged in Controlling Technology recycling pipeline, the recovery of coal just can be realized running. Meanwhile, after normal operation, the swirler that detecting unit records just starts sequence of control after entering to expect that the rotating speed (frequency) of pump reaches set(ting)value again, by the control valve 4 arranged in Controlling Technology recycling pipeline, just can realize the recovery of production system.
Wherein in an embodiment, also comprising and be arranged on the frequency sensor that described swirler enters to expect pump, the output terminal of described frequency sensor is connected with the input end signal of described detecting unit.
Wherein in an embodiment, the feed pressure in pressure two product dense-medium cyclones is had described in the detection of described detecting unit, when described feed pressure is lower than default decompression state generation pressure threshold, pressure two product dense-medium cyclone decompression state is had to occur described in then judging, when described feed pressure is higher than default decompression recovering state pressure threshold, then there are pressure two product dense-medium cyclone decompression recovering states described in judging.
When dense medium cyclone normal operation, its feed pressure maintains operating pressure, it is possible to reach good separating effect. When it enters to expect pump generation scram, this feed pressure meeting rapid reduction is to 0. Therefore, feed pressure is into the important testing conditions expecting pump whether normal operation, if feed pressure rapid reduction, can judge to there occurs fault into material pump.
Wherein in an embodiment, described in have the feeding mouth 13 of pressure two product dense-medium cyclones that the pressure transmitter for detecting feed pressure is set, the output terminal of described pressure transmitter and described detecting unit communicate to connect.
Wherein in an embodiment, described coal separation equipment also comprises cleaned coal scalping screen 5, and the output terminal of described arm 2 is connected with described cleaned coal scalping screen 5.
Cleaned coal scalping screen 5 is recovered in cleaned coal system for coal block. In the present embodiment, the coal block flowed out from arm 2 will flow to cleaned coal scalping screen 5, and is recovered in cleaned coal system by cleaned coal scalping screen 5, it is achieved reclaims.
Wherein in an embodiment, described cleaned coal scalping screen 5 is also provided with cleaned coal baffle-box 51, and the output terminal of described arm 2 is connected with the cleaned coal baffle-box 51 of described cleaned coal scalping screen 5.
The present embodiment increases cleaned coal baffle-box 51 so that being cushioned from the coal block of arm 2 recovery.
As shown in Figure 3, wherein in an embodiment, described coal separation equipment also comprises back charging basket 14 and swirler enters to expect pump 15, described swirler enters to expect that the discharge port 151 of pump 15 has the feeding mouth 13 of pressure two product dense-medium cyclones to be connected with described, described time charging basket 14 enters to expect that the material sucking port 152 of pump 15 is connected with described swirler, and the output terminal of described arm 2 is connected with described time charging basket 14.
The coal block that arm 2 is directly reclaimed by the present embodiment is sent into swirler and is entered to expect the material sucking port of pump, so that the coal block reclaimed can more directly send into feeding mouth 13.
Wherein in an embodiment, described swirler enters to expect that valve 16 has the feeding mouth 13 of pressure two product dense-medium cyclones to be connected with described to the discharge port 151 of pump 15 by entering to expect, described swirler enters to expect that the discharge port 151 of pump 15 is also connected with described time charging basket by self-circulation valve 17;
When there being pressure two product dense-medium cyclone decompression state to occur described in described detecting unit detects, enter to expect that valve 16 cuts out described in control, control described self-circulation valve 17 and open;
When there being pressure two product dense-medium cyclone decompression recovering state described in described detecting unit detects, enter to expect that valve 16 is opened described in control, control described self-circulation valve 17 and close.
The present embodiment, enters to expect that the feeding mouth 13 of pressure two product dense-medium cyclones is connected pump 15 discharge port with having by feeding pipe 19, and by self-circulation pipeline 18, charging basket 14 is connected with returning. When detecting unit detects that decompression state occurs, close into material valve 16, open self-circulation valve 17, by self-circulation pipeline 18, coal block is recovered to back in charging basket 14 temporary. When, after removal of faults on system, still keeping closing into material valve 16, open self-circulation valve 17, enter and expect that pump restarts, revolution at pump does not reach setting revolution or feed pressure when not reaching preset pressure, and detecting unit is still detected as decompression state and occurs, and enters to expect that pump is in circulation to material pattern. When the revolution of pump reaches setting revolution or feed pressure reaches preset pressure, detecting unit detects decompression recovering state, close into material valve 16, open self-circulation valve 17, the input terminus of described underflow mouth 11 with described arm 2 is disconnected with controlling valve 4 described in control, and it is connected described underflow mouth 11 and described underflow pipe 3, the normal sorting state of system recovery.
Wherein in an embodiment, described control valve 4 comprises the first Controlling solenoid valve 41 and the 2nd Controlling solenoid valve 42, described underflow mouth 11 is connected by described first Controlling solenoid valve 41 with the input terminus of described arm 2 or disconnects, and described underflow mouth 11 is connected by described 2nd Controlling solenoid valve 42 with described underflow pipe 3 or disconnects;
When there being pressure two product dense-medium cyclone decompression states to occur described in described detecting unit detects, control described first Controlling solenoid valve 41 and open, and control described 2nd Controlling solenoid valve 42 and close;
When there being pressure two product dense-medium cyclone decompression recovering state described in described detecting unit detects, control described first Controlling solenoid valve 41 and close, and control described 2nd Controlling solenoid valve 42 and open.
The present embodiment adopts two control valves 41,42 to control underflow mouth 11 and the break-make of arm 2 with underflow pipe 3 respectively.
Wherein in an embodiment, the input terminus of described arm 2 is higher than the output terminal of described arm 2.
The input terminus of arm 2 is higher than output terminal so that arm 2 has certain inclination angle, is convenient to the flowing of coal block in arm 2.
As most preferred embodiment of the present invention, enter to expect that the frequency of pump is as detected object taking swirler.
Specific implementation process is as follows:
(1) after entering to expect that failure of pump collection control is stopped, the first Controlling solenoid valve 41 and the action simultaneously of the 2nd Controlling solenoid valve 42, wherein the first Controlling solenoid valve 41 action is opened, and the 2nd Controlling solenoid valve 42 action is closed.
After entering to expect that failure of pump is got rid of, restart into material pump, when swirler enters to expect the numerical value that the rotating speed of pump reaches collection control program setting, the first Controlling solenoid valve 41 and the action simultaneously of the 2nd Controlling solenoid valve 42, wherein the first Controlling solenoid valve 41 action is closed, and the 2nd Controlling solenoid valve 42 action is opened.
According to the spatial arrangement having pressure two product dense-medium cyclones in coal separating plant applies and process characteristic: therefore, the underflow case 111 of underflow mouth 11 having pressure two product dense-medium cyclones 1 arranges a tee pipe fitting, the import of this tee pipe fitting is connected with underflow case 111, an outlet is connected with arm 2 by the first Controlling solenoid valve 41 or disconnects, another outlet is connected with underflow pipe 3 by the 2nd Controlling solenoid valve 42 or disconnects, underflow pipe 3 is connected with the spoil baffle-box 61 of spoil scalping screen 6, arm 2 is connected with the cleaned coal baffle-box 51 of cleaned coal scalping screen 5, coal block via cleaned coal scalping screen 5 through being back in cleaned coal system.
Utilize the present invention prevent run coal measures system, while improving coal preparing plant automation level, it is possible to effectively solve and have pressure two product dense-medium cyclone decompressions to run coal problems, there is active effect economizing on resources and improve in the economic benefit of enterprise.
As shown in Figure 1, be the structural representation of a kind of coal separation equipment of the present invention, include pressure two product dense-medium cyclones 1, described in have pressure two product dense-medium cyclones 1 underflow mouth 11 be connected with underflow pipe 3, also comprise prevent foregoing run coal measures unite.
The above embodiment only have expressed several enforcement modes of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to patent scope of the present invention. , it is also possible to make some distortion and improvement, it should be appreciated that for the person of ordinary skill of the art, without departing from the inventive concept of the premise these all belong to protection scope of the present invention. Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. the race coal measures that prevents of a coal separation equipment is united, described coal separation equipment includes pressure two product dense-medium cyclones, described have the underflow mouth of pressure two product dense-medium cyclones to be connected with underflow pipe, it is characterized in that, described prevent running coal measures system and comprise: detecting unit, arm and control valve, described underflow mouth by described control valve respectively input terminus and described underflow pipe with described arm be connected or disconnect;
When there being pressure two product dense-medium cyclone decompression state to occur described in described detecting unit detects, control the input terminus that described control valve is connected described underflow mouth and described arm, and disconnect described underflow mouth and described underflow pipe;
When there being pressure two product dense-medium cyclone decompression recovering state described in described detecting unit detects, control the input terminus that described control valve disconnects described underflow mouth and described arm, and it is connected described underflow mouth and described underflow pipe.
2. the race coal measures that prevents of coal separation equipment according to claim 1 is united, it is characterized in that, described coal separation equipment also comprises entering to expect pump with the described swirler having the feeding mouth 13 of pressure two product dense-medium cyclones to be connected, described detecting unit detects described swirler and enters to expect the frequency of pump, when described swirler enters to expect that the frequency of pump is lower than default decompression state occurrence frequency threshold value, pressure two product dense-medium cyclone decompression state is had to occur described in then judging, when described swirler enters to expect that the frequency of pump is higher than default decompression recovering state frequency threshold, pressure two product dense-medium cyclone decompression recovering states are had described in then judging.
3. the race coal measures that prevents of coal separation equipment according to claim 2 is united, it is characterised in that, also comprise and it is arranged on the frequency sensor that described swirler enters to expect pump, the output terminal of described frequency sensor is connected with the input end signal of described detecting unit.
4. the race coal measures that prevents of coal separation equipment according to claim 1 is united, it is characterized in that, the feed pressure in pressure two product dense-medium cyclones is had described in the detection of described detecting unit, when described feed pressure is lower than default decompression state generation pressure threshold, pressure two product dense-medium cyclone decompression state is had to occur described in then judging, when described feed pressure is higher than default decompression recovering state pressure threshold, then there are pressure two product dense-medium cyclone decompression recovering states described in judging.
5. the race coal measures that prevents of coal separation equipment according to claim 4 is united, it is characterized in that, described have the feeding mouth of pressure two product dense-medium cyclones to arrange the pressure transmitter for detecting feed pressure, and the output terminal of described pressure transmitter is connected with the input end signal of described detecting unit.
6. the race coal measures that prevents of coal separation equipment according to claim 1 is united, it is characterised in that, described coal separation equipment also comprises cleaned coal scalping screen, and the output terminal of described arm is connected with described cleaned coal scalping screen.
7. the race coal measures that prevents of coal separation equipment according to claim 1 is united, it is characterized in that, described coal separation equipment also comprises back charging basket and swirler enters to expect pump, described swirler enters to expect that the discharge port of pump has the feeding mouth of pressure two product dense-medium cyclones to be connected with described, described time with described swirler, charging basket enters to expect that the material sucking port of pump is connected, and the output terminal of described arm is connected with described time charging basket.
8. the race coal measures that prevents of coal separation equipment according to claim 7 is united, it is characterized in that, described swirler enters to expect that valve has the feeding mouth of pressure two product dense-medium cyclones to be connected with described to the discharge port of pump by entering to expect, described swirler enters to expect that the discharge port of pump is also connected with described time charging basket by self-circulation valve;
When there being pressure two product dense-medium cyclone decompression state to occur described in described detecting unit detects, enter described in control and expect that valve cuts out, control described self-circulation valve and open;
When there being pressure two product dense-medium cyclone decompression recovering state described in described detecting unit detects, enter described in control and expect that valve is opened, control described self-circulation valve and close.
9. coal separation equipment according to the arbitrary item of claim 1～8 prevent run coal measures system, it is characterized in that, described control valve comprises the first Controlling solenoid valve and the 2nd Controlling solenoid valve, described underflow mouth is connected by described first Controlling solenoid valve with the input terminus of described arm or disconnects, and described underflow mouth is connected with described underflow pipe by described 2nd Controlling solenoid valve or is disconnected;
When there being pressure two product dense-medium cyclone decompression state to occur described in described detecting unit detects, control described first Controlling solenoid valve and open, and control described 2nd Controlling solenoid valve closedown;
When there being pressure two product dense-medium cyclone decompression recovering state described in described detecting unit detects, control described first Controlling solenoid valve and close, and control described 2nd Controlling solenoid valve and open.
10. a coal separation equipment, include pressure two product dense-medium cyclones, described in have pressure two product dense-medium cyclones underflow mouth is connected with underflow pipe, it is characterised in that, also comprise as described in item as arbitrary in claim 1～9 preventing race coal measures unite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610191067.7A CN105665156B (en) | 2016-03-30 | 2016-03-30 | A kind of cleaning unit prevent run coal measures system and cleaning unit |
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| CN103934128A (en) * | 2014-04-03 | 2014-07-23 | 中煤科工集团唐山研究院有限公司 | Double-inlet pressure feed heavy medium cyclone and coal separation method |
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