CN117229825A - Anti-sedimentation heavy medium coarse particle pipe coal slurry conveying preparation system and preparation method - Google Patents
Anti-sedimentation heavy medium coarse particle pipe coal slurry conveying preparation system and preparation method Download PDFInfo
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- 239000003250 coal slurry Substances 0.000 title claims abstract description 65
- 239000011362 coarse particle Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 238000004062 sedimentation Methods 0.000 title claims abstract description 19
- 239000003245 coal Substances 0.000 claims abstract description 54
- 238000011084 recovery Methods 0.000 claims abstract description 44
- 238000002156 mixing Methods 0.000 claims abstract description 34
- 208000005156 Dehydration Diseases 0.000 claims abstract description 21
- 230000018044 dehydration Effects 0.000 claims abstract description 21
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000004064 recycling Methods 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 7
- 239000002002 slurry Substances 0.000 claims description 46
- 239000007788 liquid Substances 0.000 claims description 41
- 238000003756 stirring Methods 0.000 claims description 16
- 239000000706 filtrate Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 14
- 238000007689 inspection Methods 0.000 claims description 13
- 230000003139 buffering effect Effects 0.000 claims description 11
- 239000006148 magnetic separator Substances 0.000 claims description 11
- 238000012546 transfer Methods 0.000 claims description 10
- 239000010419 fine particle Substances 0.000 claims description 8
- 230000001502 supplementing effect Effects 0.000 claims description 8
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 239000013072 incoming material Substances 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 238000000265 homogenisation Methods 0.000 abstract 1
- 238000000227 grinding Methods 0.000 description 3
- 101150054854 POU1F1 gene Proteins 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000004537 pulping Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
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- 238000010276 construction Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
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Abstract
The invention discloses a preparation system and a preparation method of heavy medium coarse particle pipe coal slurry for preventing sedimentation, wherein the preparation system mainly comprises the following steps: the preparation method comprises the following steps of: the method comprises the steps of (1) preparing coarse particle pipe coal slurry, (2) carrying out homogenization mixing on the prepared coarse particle pipe coal slurry and a heavy medium, then carrying out conveying, (3) carrying out medium removal and dehydration treatment on the terminal coal slurry, arranging a heavy medium recovery device by a dehydration system to remove the heavy medium in the coarse particle coal slurry, and (4) conveying the recovered heavy medium to the head end through a heavy medium recovery pipeline so as to realize recycling of the heavy medium. The coarse particle coal slurry prepared by the method can keep good homogeneity and stability under the condition of low pipeline conveying flow rate, and meanwhile, the dehydration process required by the coal slurry is simple, the removed water is low, and the cost of secondary treatment of the coal slurry by a terminal coal user can be reduced.
Description
Technical Field
The invention belongs to the field of coal slurry pipeline transportation, and particularly relates to an anti-sedimentation heavy medium coarse particle pipe coal slurry transportation preparation system and a preparation method.
Background
The pipeline coal conveying is carried out by taking water as a carrier, crushing and grinding the water to prepare coal slurry with proper granularity and concentration, carrying the coal slurry to a terminal user in a relay way through a pipeline by a high-pressure pump, and meeting the requirements of different types of users after terminal treatment. Besides the characteristics of safety and reliability, the pipeline coal conveying device also needs to have considerable economic benefit and market competitiveness. The research of slurry conveying technology is paid attention to in China from the 80 s of the last century, and the range of conveying materials is enlarged so as to solve the defect of energy supply in China.
The disadvantages of the traditional coal slurry pipe are as follows: the ore grinding energy consumption is high, and the terminal dehydration is high in fine fraction content, so that dehydration indexes are difficult to meet the coal consumption requirements of users, multiple times of dehydration are needed, and the cost is increased. The coarse particle coal slurry is conveyed as a brand new pipeline coal conveying mode, and the particle size is improved, so that the process links of grinding the head end of a pipeline and dehydrating the terminal end of the pipeline can be effectively simplified, the early investment of pipeline construction is reduced, the power consumption is reduced, the pipeline operation cost is reduced, the cost performance and the competitiveness of coal pipeline conveying are further improved, and the method is mainly suitable for the middle-short coal slurry conveying field. However, coarse particles in the coal slurry have more obvious sedimentation characteristics, and meanwhile, the lower fine particle content of the coarse particles can increase the sedimentation probability of the particles in the pipeline, so that risks are brought to the safe transportation of the pipeline, the sedimentation problem of the fine coarse particles in the slurry is solved, and the method is a key for ensuring the transportation stability of the coarse particle coal slurry and improving the application and popularization of the technology.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an anti-sedimentation heavy medium coarse particle pipe coal slurry preparation system and a preparation method, and the stability of slurry in pipeline transportation is ensured while the upper limit of the size fraction of slurry particles is improved by introducing a heavy medium feeding and circulating system. The method is mainly suitable for coarse particle coal slurry conveyed by pipelines such as power plant coal conveying, coal chemical industry and the like. Besides reducing the sedimentation risk of coarse particle coal slurry, the terminal coal slurry is convenient to dewater by improving the upper limit of the granularity of the coal slurry, and the secondary treatment work of a terminal user on the incoming coal is greatly simplified. Meanwhile, the medium returning system ensures the recycling of heavy media and saves energy consumption.
The technical scheme provided by the invention is as follows: the utility model provides a heavy medium coarse particle pipe coal slurry preparation system of anti-settling, includes slurrying system, heavy medium feeding system and heavy medium recovery system, slurrying system includes coal pit, breaker, inspection sieve, screw conveyer, surge bin, quantitative feeder, mixed thick liquid bucket and feed pump that connect gradually, heavy medium feeding system includes medium recovery tank, heavy medium bucket and heavy medium liquid feeding pump, heavy medium liquid feeding pump's export is connected to mixed thick liquid bucket, and the outlet of feed pump passes through coal slurry transfer line and is connected to first class dewatering equipment, heavy medium recovery system includes the magnet separator, and the heavy medium filtrate outlet that contains of first class dewatering equipment is connected with the import of magnet separator, and the magnet separator passes through the chute and links to each other with the recovery tank, and the recovery tank bottom links to each other with the medium recovery tank through heavy medium return line, and the export and the filter bucket that are connected for receiving the filter that get into the filter that gets into second class dewatering equipment through the second grade dehydration feed pump, and the coarse grain that the second grade dehydration is carried to the place through the fine pile through the conveyer belt.
Further, the coal pit is connected with the breaker, the breaker below passes through the chute with the inspection sieve and links to each other, the sieve lower object outlet connection of inspection sieve is to screw conveyer, and screw conveyer export links to each other the entry of surge bin, and the surge bin export links to each other with the constant feeder, is provided with the muddy thick liquid bucket and receives the constant feeder incoming material, and the export of muddy thick liquid bucket links to each other with the feed pump.
Further, the diameter of the inspection sieve holes is set to be 6mm; the feeding amount of the buffering capacity of the buffering bin is 15-30 min, a radar level gauge is arranged at the top of the buffering bin, and a hydraulic gate is arranged at a discharge hole to control the opening of materials.
Furthermore, the quantitative feeder is provided with a variable-frequency speed regulation module and a weighing module, and is used for realizing the controllable feeding of raw coal and the real-time feeding amount detection; the slurry mixing barrel is provided with a high-speed shearing and stirring function, a flow guide baffle is arranged around the barrel wall, an ultrasonic liquid level meter is arranged at the top of the slurry mixing barrel to detect the liquid level of slurry, a heavy medium feeding opening is arranged in the slurry mixing barrel and is used for being connected with a conveying pipeline of a heavy medium feeding pump, a differential pressure densimeter is arranged at the bottom of the slurry mixing barrel, and a bottom discharge hole is connected with a feeding pump.
Further, a transfer pump is arranged on the medium recovery tank, and an air charging device is arranged at the bottom of the medium recovery tank to prevent the medium from settling, and the transfer pump is connected with the heavy medium barrel; the heavy medium barrel has a stirring function, a differential pressure densimeter is arranged at the bottom, an ultrasonic liquid level meter is arranged at the top, and a water supplementing port is arranged at the upper part so as to realize the adjustment and control of the density of the heavy medium; the dense medium liquid adding pump is provided with a frequency converter so as to realize adjustable flow, a sonar flowmeter is arranged at the outlet, and an outlet pipeline is connected to the inlet of the slurry mixing barrel.
Further, the primary dewatering equipment is selected from a decanter centrifuge or a slime centrifuge, and the screen is characterized in that: the gap between the sieve seams is less than 0.35-0.5 mm, and is used for recovering coal slurry particles with the size of more than 0.35-0.5 mm in the coal slurry; the secondary dehydration equipment is selected from a plate-and-frame filter press or a membrane filter press, and the screen is characterized in that: the gap between the sieve seams is less than 0.2mm, and is mainly used for recovering fine particle coal slurry; the recycling bin has a stirring function, a liquid level meter is arranged in the recycling bin, a differential pressure type densimeter is arranged at the bottom, an electromagnetic water supplementing valve and a flowmeter are arranged at the top, the flowmeter is in control linkage with the densimeter, and automatic water supplementing is realized according to the appointed density.
The invention provides another technical scheme that: a preparation method of heavy medium coarse particle pipe coal slurry comprises the following steps:
s1, conveying raw material coal in a coal pit to a crusher for crushing, screening by a checking screen, and conveying undersize materials to a buffer bin for buffering by a screw conveyor;
s2, opening a flat gate under the buffer bin, feeding raw coal with a specified proportion into a slurry mixing barrel through a quantitative feeder, and simultaneously opening a stirrer of the slurry mixing barrel to perform stirring operation;
s3, conveying the recovery medium in the medium recovery tank to a medium barrel through a transfer pump, adding process water to enable the concentration of the medium barrel heavy medium liquid to reach a specified concentration, adding the prepared heavy medium liquid into a slurry mixing barrel according to a certain proportion through a heavy medium liquid adding pump, stirring and curing the heavy medium liquid and coarse particle coal together to prepare pipe coal conveying slurry, and conveying the prepared coal slurry to a coal slurry conveying pipeline through a feeding pump;
s4, dehydrating the slurry conveyed by the coal slurry conveying pipeline through primary dehydration equipment, enabling the filtrate containing the heavy media to enter a magnetic separator for heavy media recovery, enabling the recovered heavy media to enter a recovery barrel, adding water to prepare the recovery media into slurry with specified concentration, and conveying the media to a medium recovery tank through a heavy media return pipeline by a medium return pump;
and S5, delivering the dielectric-removing filtrate into a dielectric-removing filtrate barrel, delivering the dielectric-removing filtrate into secondary dehydration equipment for dehydration through a secondary dehydration feeding pump, and delivering coarse particles subjected to primary dehydration and fine particles subjected to secondary dehydration to a designated coal stacking site through a conveying belt.
Further, in the step S1, raw coal is clean coal feed of a coal preparation plant, and the total moisture M=10-25%;
the particle size characteristics of the crushed undersize are as follows: -0.045mm content 2% -5%, 3 mm-6 mm content 20%, average particle size 0.9-1.6 mm.
Furthermore, in the step S3, the heavy medium adopts magnetite powder, the specific gravity of the magnetite powder is 4.6-5, the content of 325 meshes is more than 85%, and the content of more than 0.15mm is not more than 1%; the magnetite powder accounts for not more than 20% of the dry basis of the coal in the ore pulp,
the mass concentration of the heavy medium liquid in the medium barrel (10) is set to be 30-35%;
the mass concentration range of the coal slurry of the slurry mixing barrel is 35% -55%, and the mass concentration is calculated according to the following formula:
wherein, the mass of M coal-dry base coal/kg, the mass of M water-slurry water and the mass of M heavy medium-heavy medium are respectively calculated;
the stirring and curing operation time is 30-50 min.
Further, the recovery rate of the heavy medium in the step S4 is more than 98%, and the designated concentration of the returned medium is 30% -35%.
The heavy medium is adopted to replace water as a pipeline conveying medium, so that the sedimentation of coarse particles in the coal slurry can be reduced, and the safety of slurry conveying is ensured; in addition, through the medium recovery system provided by the invention, on one hand, the content of fine particles in coarse particle coal slurry is not increased, so that the dehydration efficiency is ensured; on the other hand, the medium consumption is reduced. The invention can effectively reduce the sedimentation risk in the coarse particle coal slurry conveying process, and simultaneously ensures that the dewatering efficiency of the terminal coarse particle coal slurry is not affected.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a process flow diagram of the present invention;
in the figure: 1-coal pit, 2-breaker, 3-inspection sieve, 4-screw conveyer, 5-surge bin, 6-quantitative feeder, 7-slurry mixing barrel, 8-feed pump, 9-medium recovery tank, 10-heavy medium barrel, 11-heavy medium liquid feeding pump, 12-primary dewatering equipment, 13-magnetic separator, 14-recovery barrel, 15-medium returning pump, 16-medium removing filtrate barrel, 17-secondary dewatering feed pump, 18-secondary dewatering equipment and 19-conveying belt.
Detailed Description
The present invention will be further described with reference to the following detailed description, wherein the drawings are for illustrative purposes only and are shown in schematic, rather than physical, drawings, and are not to be construed as limiting the invention, and wherein certain components of the drawings are omitted, enlarged or reduced in size, and do not represent the actual product size, so it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted, and that all other embodiments obtained by those of ordinary skill in the art without making inventive efforts, based on the embodiments of the present invention, are within the scope of protection of the present invention.
In the description of the present invention, it should be noted that the azimuth or positional relationship indicated by the terms "front", "rear", "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically 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.
The heavy medium coarse particle pipe coal slurry preparation system capable of preventing sedimentation comprises a pulping system, a heavy medium feeding system and a heavy medium recovery system, wherein the pulping system comprises a coal pit 1, a crusher 2, an inspection screen 3, a screw conveyor 4, a buffer bin 5, a quantitative feeder 6, a slurry mixing barrel 7 and a feeding pump 8 which are sequentially connected, the heavy medium feeding system comprises a medium recovery tank 9, a heavy medium barrel 10 and a heavy medium feeding pump 11, the outlet of the heavy medium feeding pump 11 is connected to the slurry mixing barrel 7, the outlet of the feeding pump 8 is connected to a primary dewatering device 12 through a coal slurry conveying pipeline, the heavy medium recovery system comprises a magnetic separator 13, the heavy medium filtrate outlet of the primary dewatering device 12 is connected with the inlet of the magnetic separator 13, the magnetic separator 13 is connected with a recovery barrel 14 through a chute, the bottom of the recovery barrel 14 is connected with a medium return pump 15 through a heavy medium return pipeline, the outlet of the magnetic separator 13 is connected with a dewatering filtrate barrel 16 for receiving the dewatering filtrate 16, the dewatering barrel 16 is conveyed to a secondary dewatering device through a secondary dewatering device 18, and the secondary dewatering device enters a secondary dewatering device through a secondary dewatering device 19 through a secondary dewatering belt.
The coal pit 1 is connected with the crusher 2, the lower part of the crusher 2 is connected with the inspection sieve 3 through a chute, the undersize outlet of the inspection sieve 3 is connected to the screw conveyor 4, the outlet of the screw conveyor 4 is connected to the inlet of the buffer bin 5, the outlet of the buffer bin 5 is connected with the quantitative feeder 6, the slurry mixing barrel 7 is arranged to receive the incoming materials of the quantitative feeder 6, and the outlet of the slurry mixing barrel 7 is connected with the feeding pump 8.
The diameter of the sieve hole of the inspection sieve 3 is set to be 6mm; the buffering capacity of the buffering bin 5 is 15-30 min, a radar level gauge is arranged at the top of the buffering bin 5, and a hydraulic gate is arranged at a discharge hole to control the opening of materials.
The quantitative feeder 6 is provided with a variable-frequency speed regulation module and a weighing module, and is used for realizing the controllable feeding of raw coal and the real-time feeding amount detection; the slurry mixing barrel 7 is provided with a high-speed shearing and stirring function, a flow guide baffle is arranged around the barrel wall, an ultrasonic liquid level meter is arranged at the top of the slurry mixing barrel 7 to detect the liquid level of slurry, a heavy medium feeding opening is arranged in the slurry mixing barrel 7 and is used for being connected with a conveying pipeline of a heavy medium liquid feeding pump 11, a differential pressure densimeter is arranged at the bottom of the slurry mixing barrel 7, and a bottom discharge hole is connected with a feeding pump 8.
The medium recovery tank 9 is provided with a transfer pump, and the bottom of the medium recovery tank is provided with an air charging device to prevent the medium from settling, and the transfer pump is connected with the heavy medium barrel 10; the heavy medium barrel 10 has a stirring function, a differential pressure densimeter is arranged at the bottom, an ultrasonic liquid level meter is arranged at the top, and a water supplementing port is arranged at the upper part so as to realize adjustment and control of the density of heavy medium; the dense medium liquid adding pump 11 is provided with a frequency converter to realize adjustable flow, a sonar flowmeter is arranged at the outlet, and an outlet pipeline is connected to the inlet of the slurry mixing barrel 7.
The primary dewatering device 12 is selected from a decanter centrifuge or a slime centrifuge, and the screen is characterized in that: the gap between the sieve seams is less than 0.35-0.5 mm, and is used for recovering coal slurry particles with the size of more than 0.35-0.5 mm in the coal slurry; the secondary dewatering device 18 is selected from a plate and frame filter press or a membrane filter press, and the screen is characterized in that: the gap between the sieve seams is less than 0.2mm, and is mainly used for recovering fine particle coal slurry; the recycling bin 14 is provided with a stirring function, a liquid level meter is arranged in the recycling bin 14, a differential pressure type densimeter is arranged at the bottom, an electromagnetic water supplementing valve and a flowmeter are arranged at the top, and the flowmeter is in control linkage with the densimeter to automatically supplement water according to the specified density.
Example 1
Raw coal particle size distribution of raw coal of 11.3% total moisture was shown in table 1 using shanxi long flame coal as raw coal.
Table 1 example 1 uses a long flame coal index
The raw coal is crushed by a ring hammer crusher to obtain a crushed coal sample by adopting the heavy medium coarse particle pipe coal slurry preparation system for preventing sedimentation as shown in figure 1 and the process flow as shown in figure 2. Sieving with linear vibrating sieve, sequentially passing through screw conveyor, buffer bin, and quantitative feeder, mixing with water and heavy medium in slurry mixing barrel, stirring, aging for 30min, and mixing slurry index shown in table 2.
Table 2 index for preparing coarse particle coal slurry as heavy medium
The heavy medium adopts magnetite powder, the specific gravity is 4.7, the content of minus 325 meshes is 86.5 percent, and the content of more than 0.15mm is 1 percent. After the concentration of the heavy medium liquid in the heavy medium barrel is configured to be 35%, the heavy medium liquid is added into the slurry mixing barrel through a heavy medium liquid adding pump, and the mass fraction of the prepared ore pulp is 55%, wherein the content of the heavy medium is 20%, and the indexes are shown in table 2. The mixed ore pulp is tested by a centrifugal slag pulp pump through an industrialized loop, the flow states of the ore pulp at three flow rates of 1.8m/s, 2.0m/s and 2.2m/s are observed through a transparent observation tube, and the properties of the ore pulp are stable, so that no deposition of solid particles is found. And (5) carrying out medium recovery and dehydration of ore pulp after the test. Wherein, the first-stage dehydration adopts a horizontal sedimentation centrifuge, the heavy medium is removed by a magnetic separator, the recovery rate is calculated to be 98.5%, and the coal slurry after the heavy medium removal is subjected to the second-stage dehydration by plate-frame filter pressing. The external moisture of the final dehydrated product was measured to be 12.8%.
Example 2
Lean coal in a certain place of elm was used as raw coal, the total moisture was 10.82%, and the particle size distribution of the raw coal was shown in table 3.
Table 3 example 2 using lean coal index
In example 1, the addition amount of the heavy medium was adjusted to 15%, a coal slime centrifuge was used as the primary dewatering equipment, a membrane filter press was used as the secondary dewatering equipment, the other steps were kept the same as those of example 1, and the slurry flow states at three flow rates of 1.8m/s, 2.0m/s and 2.2m/s were observed through loop test and dewatering measurement, and the results showed that the slurry properties were stable, and no deposition of solid particles was found. The recovery rate of the heavy medium was 99.2%, and the external moisture of the dehydrated coal was 11.84%.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a heavy medium coarse particle pipe coal slurry preparation system of anti-settling, characterized by includes slurrying system, heavy medium feeding system and heavy medium recovery system, slurrying system includes coal pit (1), breaker (2), inspection sieve (3), screw conveyer (4), buffer bin (5), quantitative feeder (6), mixing bucket (7) and feed pump (8) that connect gradually, heavy medium feeding system includes medium recovery tank (9), heavy medium bucket (10) and heavy medium feeding pump (11), the export of heavy medium feeding pump (11) is connected to mixing bucket (7), the export of feed pump (8) is connected to one-level dewatering equipment (12) through coal slurry transfer pipeline, heavy medium recovery system includes magnetic separator (13), the import connection of heavy medium-containing filtrate export and magnetic separator (13) of one-level dewatering equipment (12), magnetic separator (13) are connected with recovery bucket (14) through the chute, recovery bucket (14) bottom is connected with return pump (15), return pump (15) are connected with second dewatering medium (16) through heavy medium return tank (9) and second dewatering medium (16) are carried out to dewatering equipment (16) through the second dewatering medium return pump (16), the coarse particles after primary dehydration and the fine particles after secondary dehydration are conveyed to a designated coal stacking site by a conveying belt (19).
2. The sedimentation-preventing heavy medium coarse particle pipe coal slurry conveying preparation system according to claim 1, characterized in that a coal pit (1) is connected with a crusher (2), the lower part of the crusher (2) is connected with an inspection sieve (3) through a chute, a screen lower outlet of the inspection sieve (3) is connected to a screw conveyor (4), an outlet of the screw conveyor (4) is connected to an inlet of a buffer bin (5), an outlet of the buffer bin (5) is connected with a quantitative feeder (6), a slurry mixing barrel (7) is arranged for receiving the incoming material of the quantitative feeder (6), and an outlet of the slurry mixing barrel (7) is connected with a feeding pump (8).
3. The sedimentation-preventing heavy medium coarse particle pipe coal slurry production system according to claim 2, wherein the diameter of the screen hole of the inspection screen (3) is set to be 6mm; the buffering capacity of the buffering bin (5) is 15-30 min, a radar level gauge is arranged at the top of the buffering bin (5), and a hydraulic gate is arranged at a discharge hole to control the opening of materials.
4. The sedimentation-preventing heavy medium coarse particle pipe coal slurry preparation system according to claim 2, wherein the quantitative feeder (6) is provided with a variable frequency speed regulation module and a weighing module, and is used for realizing the controllable feeding and real-time feeding amount detection of raw coal; the utility model discloses a slurry mixing barrel, including thick liquid barrel, thick liquid barrel (7) have high-speed shearing stirring function, set up the water conservancy diversion baffle around the barrel wall, the top of thick liquid barrel (7) is provided with ultrasonic wave level gauge and detects thick liquid level, thick liquid barrel (7) set up heavy medium pan feeding opening be used for with heavy medium liquid throw the delivery line connection of pump (11), the bottom of thick liquid barrel (7) sets up differential pressure densimeter, bottom discharge gate links to each other with feed pump (8).
5. The sedimentation-preventing heavy medium coarse particle pipe coal slurry conveying system according to claim 1, wherein a transfer pump is arranged on the medium recovery tank (9), an air charging device is arranged at the bottom of the medium recovery tank to prevent the medium from sedimentation, and the transfer pump is connected with the heavy medium barrel (10); the heavy medium barrel (10) has a stirring function, a differential pressure densimeter is arranged at the bottom, an ultrasonic liquid level meter is arranged at the top, and a water supplementing port is arranged at the upper part so as to realize adjustment and control of the density of heavy medium; the dense medium liquid adding pump (11) is provided with a frequency converter to realize adjustable flow, a sonar flowmeter is arranged at the outlet, and an outlet pipeline is connected to the inlet of the slurry mixing barrel (7).
6. The anti-settling heavy medium coarse particle pipe coal slurry production system according to claim 1, wherein the primary dewatering device (12) is selected from a decanter centrifuge or a slime centrifuge, and the screen is characterized in that: the gap between the sieve seams is less than 0.35-0.5 mm, and is used for recovering coal slurry particles with the size of more than 0.35-0.5 mm in the coal slurry; the secondary dewatering device (18) is selected from a plate-and-frame filter press or a membrane filter press, and the screen is characterized in that: the gap between the sieve seams is less than 0.2mm, and is mainly used for recovering fine particle coal slurry; the recycling bin (14) is provided with a stirring function, a liquid level meter is arranged in the recycling bin (14), a differential pressure type densimeter is arranged at the bottom, an electromagnetic water supplementing valve and a flowmeter are arranged at the top, the flowmeter is in control linkage with the densimeter, and automatic water supplementing is realized according to the appointed density.
7. The preparation method of the heavy medium coarse particle pipe coal slurry for preventing sedimentation is characterized by comprising the following steps of:
step S1, conveying raw coal in a coal pit (1) to a crusher (2) for crushing, screening by a check screen (3), and conveying undersize materials to a buffer bin (5) for buffering by a screw conveyor (4);
s2, opening a flat gate under the buffer bin (5), feeding raw coal with a specified proportion into the slurry mixing barrel (7) through a quantitative feeder, and simultaneously opening a stirrer of the slurry mixing barrel (7) to perform stirring operation;
s3, conveying a recovery medium in a medium recovery tank (9) into a medium barrel (10) through a transfer pump, adding process water to enable the mass concentration of the heavy medium liquid in the medium barrel (10) to reach a specified concentration, adding the prepared heavy medium liquid into a slurry mixing barrel (7) according to a certain proportion through a heavy medium liquid adding pump (11), stirring and curing the heavy medium liquid and coarse particle coal to prepare a pipe coal slurry, and conveying the prepared coal slurry to a coal slurry conveying pipeline through a feeding pump (8);
s4, dehydrating the slurry conveyed by the coal slurry conveying pipeline through first-stage dehydrating equipment (12), enabling the filtrate containing heavy media to enter a magnetic separator (13) for heavy media recovery, enabling the recovered heavy media to enter a recovery barrel (14), adding water to prepare the recovery media into slurry with specified concentration, and conveying the media to a medium recovery tank (9) through a heavy media return pipeline by a medium return pump (15);
and S5, introducing the dielectric-removing filtrate into a dielectric-removing filtrate barrel (16), conveying the dielectric-removing filtrate into a secondary dewatering device (17) through a secondary dewatering feeding pump (17) for dewatering, and conveying the coarse particles subjected to primary dewatering and the fine particles subjected to secondary dewatering to a designated coal stacking site through a conveying belt (19).
8. The method for preparing the heavy medium coarse particle pipe coal slurry for preventing sedimentation according to claim 7, which is characterized by comprising the following steps:
the raw material coal in the step S1 is clean coal feed of a coal preparation plant, and the total moisture M=10-25%;
the particle size characteristics of the crushed undersize are as follows: -0.045mm content 2% -5%, 3 mm-6 mm content 20%, average particle size 0.9-1.6 mm.
9. The method for preparing the heavy medium coarse particle pipe coal slurry for preventing sedimentation according to claim 7, which is characterized by comprising the following steps: in the step S3, the heavy medium adopts magnetite powder, the specific gravity of the magnetite powder is 4.6-5, the content of minus 325 meshes is more than 85 percent, and the content of more than 0.15mm is not more than 1 percent; the magnetite powder accounts for not more than 20% of the dry basis of the coal in the ore pulp,
the mass concentration of the heavy medium liquid in the medium barrel (10) is set to be 30-35%;
the mass concentration range of the coal slurry of the slurry mixing barrel is 35% -55%, and the mass concentration is calculated according to the following formula:
wherein, the mass of M coal-dry base coal/kg, the mass of M water-slurry water and the mass of M heavy medium-heavy medium are respectively calculated;
the stirring and curing operation time is 30-50 min.
10. The method for preparing the heavy medium coarse particle pipe coal slurry for preventing sedimentation according to claim 7, which is characterized by comprising the following steps: the recovery rate of the heavy medium in the step S4 is more than 98 percent, and the designated concentration of the returned medium is 30-35 percent.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103816992A (en) * | 2014-03-26 | 2014-05-28 | 威海市海王旋流器有限公司 | Coarse slime dense medium sorting technology and system |
| CN105597914A (en) * | 2016-03-17 | 2016-05-25 | 威海市海王旋流器有限公司 | Dense medium jamming bed coarse slime separation system |
| CN106179717A (en) * | 2016-07-22 | 2016-12-07 | 中煤科工集团唐山研究院有限公司 | A kind of full level of thermal coal is selected in simplified heavy medium sorting process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103816992A (en) * | 2014-03-26 | 2014-05-28 | 威海市海王旋流器有限公司 | Coarse slime dense medium sorting technology and system |
| CN105597914A (en) * | 2016-03-17 | 2016-05-25 | 威海市海王旋流器有限公司 | Dense medium jamming bed coarse slime separation system |
| CN106179717A (en) * | 2016-07-22 | 2016-12-07 | 中煤科工集团唐山研究院有限公司 | A kind of full level of thermal coal is selected in simplified heavy medium sorting process |
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