CN113695070B - Treatment system and method for improving concentration of coal slurry - Google Patents

Treatment system and method for improving concentration of coal slurry Download PDF

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CN113695070B
CN113695070B CN202110993411.5A CN202110993411A CN113695070B CN 113695070 B CN113695070 B CN 113695070B CN 202110993411 A CN202110993411 A CN 202110993411A CN 113695070 B CN113695070 B CN 113695070B
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coal slurry
slurry
fine
rod mill
coal
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CN113695070A (en
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刘兵
杜雪田
杜波阳
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Shaanxi Zhongao Changxing Industrial Co ltd
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Shaanxi Zhongao Changxing Industrial Co ltd
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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
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00—General arrangement of separating plant, e.g. flow sheets
    • B03B9/005—General arrangement of separating plant, e.g. flow sheets specially adapted for coal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
    • 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
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
    • Y02E20/18—Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]

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  • Food Science & Technology (AREA)
  • Liquid Carbonaceous Fuels (AREA)
  • Crushing And Grinding (AREA)

Abstract

The application discloses a processing system and a processing method for improving the concentration of coal slurry, wherein the system comprises a rod mill system, a primary grading system, a secondary grading system and a fine mill system; a first-stage grading system is connected between the input end of the rod mill system and the output end of the rod mill system; the output end of the rod mill system is respectively connected with the gasification pipeline and the input end of the secondary separation system; the secondary stage separation system is connected with the fine grinding machine system to further separate the coal slurry input into the secondary stage separation system; the output end of the fine grinding machine system is connected with the input end of the rod mill system so as to input the ground coal slurry into the rod mill system again for mixing. The method solves the technical problems that the curing degree of the prepared coal slurry is insufficient, the concentration of the coal slurry is low and the slurry leakage phenomenon frequently occurs through the roller screen at the outlet of the rod mill in the prior art, and achieves the purposes of improving the curing degree of the coal slurry, increasing the fluidity of the coal slurry, further improving the concentration of the coal slurry and avoiding the slurry leakage phenomenon of the rod mill.

Description

Treatment system and method for improving concentration of coal slurry
Technical Field
The application relates to the technical field of coal chemical industry, in particular to a treatment system and a method for improving coal slurry concentration.
Background
Coal gasification is an important component of clean coal technology, has a tap position, converts cheap coal into clean coal gas, and can be used for producing chemical products such as synthetic ammonia, methanol, dimethyl ether and the like, and also can be used in the fields of poly-generation and the like based on coal gasification. Through years of practical exploration, china accumulates rich operation, management and manufacturing experience in the aspect of coal water slurry gasification technology, and the coal gasification technology is mature and perfect.
The concentration of coal slurry is used as a main parameter of the gasifier, and has great influence on gasification rate, coal gas quality, raw material consumption, coal slurry transportation, atomization and the like, if the concentration of the coal water slurry is too low, water entering the gasifier increases, a large amount of heat is required during evaporation of the water, the amount of oxygen is required to be increased in order to maintain the temperature of the gasifier, the specific oxygen amount is increased, and the content and gasification efficiency of the effective gas component CO+H2 are reduced.
In enterprises in China which take gasification of water-coal-slurry as a tap to produce chemical products, a single rod mill pulping process (shown in figure 1) is adopted for preparing the coal-slurry, namely coal and additives are ground together with water through a rod mill to prepare the coal-slurry, the prepared coal-slurry enters a coal-slurry tank, and is pumped into a slurry storage tank through a coal-slurry pump, and finally the coal-slurry in the slurry storage tank is pumped out for gasification through another coal-slurry pump, wherein the defect of the process is that the curing degree of the coal-slurry is insufficient, the concentration of the coal-slurry is low, the overall operation efficiency of a gasification furnace is affected, and once the concentration is improved, a slurry overflow phenomenon often occurs through a rotary screen at an outlet of the rod mill; in addition, the concentration of the coal slurry prepared by the process in the prior art is about 60%, and the defects of high viscosity, poor rheological property, poor atomization property and the like exist, so that the specific coal consumption and the specific oxygen consumption of coal gasification are high, the effective gas components are low, and the economy of coal water slurry gasification is seriously affected.
Disclosure of Invention
The processing system and the processing method for improving the concentration of the coal slurry solve the technical problems that the viscosity of the coal slurry prepared in the prior art is high, the rheological property and the atomization are poor, the curing degree is insufficient, the concentration of the coal slurry is low, the integral operation efficiency of a gasification furnace is affected, and the slurry overflow phenomenon frequently occurs through a roller screen at the outlet of a rod mill, and the purposes of improving the curing degree of the coal slurry, increasing the fluidity of the coal slurry, further improving the concentration of the coal slurry and avoiding the slurry overflow phenomenon of the rod mill are achieved.
The processing system for improving the concentration of the coal slurry comprises a rod mill system, a primary grading system, a secondary grading system and a fine mill system; the primary classification system is connected between the input end of the rod mill system and the output end of the rod mill system so as to perform primary separation on coal slurry entering the rod mill system through the primary classification system; the output end of the rod mill system is respectively connected with a gasification pipeline and the input end of the secondary separation system so as to gasify part of the coal slurry and input the rest coal slurry into the secondary separation system; the secondary grading system is connected with the fine grinding machine system to further separate the coal slurry input into the secondary grading system, and the coal slurry after further separation is input into the fine grinding machine system for grinding; the output end of the fine grinding machine system is connected with the input end of the rod mill system so as to input the ground coal slurry into the rod mill system again for mixing.
In one possible implementation, the rod mill system includes a rod mill, a low pressure coal slurry tank, and a first coal slurry pump; the first-stage classification system is connected between the outlet drum screen of the rod mill and the low-pressure coal slurry tank; the first coal slurry pump is connected with the low-pressure coal slurry tank, and the output end of the first coal slurry pump is respectively connected with a gasification pipeline and the secondary classification system, so that the coal slurry in the low-pressure coal slurry tank is pumped out and is respectively conveyed to the gasification pipeline and the secondary classification system.
In one possible implementation, the first stage classification system includes an overflow classifier and a first molecular vibrator; the input end of the overflow classifier is communicated with an outlet drum screen of the rod mill so as to perform primary separation on the coal slurry overflowed from the rod mill; the first molecular vibrator is communicated with the output end of the overflow classifier so as to carry out internal dewatering operation on the coal slurry after preliminary separation. And a coal slurry pipeline is communicated between the first molecular vibrator and the outlet drum screen of the rod mill.
In one possible implementation, the secondary classification system includes a secondary classifier, a second molecular vibrator, a coarse slurry tank, and a second slurry pump; the input end of the secondary classifier is connected with the output end of the rod mill system so as to further separate the coal slurry input into the secondary classifier; the output end of the secondary classifier is respectively connected with the second molecular vibrator and the fine grinding machine system so as to respectively convey the further separated coal slurry to the second molecular vibrator and the fine grinding machine system; the second molecular vibrator, the coarse slurry tank and the second coal slurry pump are sequentially connected in series so as to carry out internal dewatering operation on the coal slurry input to the second molecular vibrator and input the coal slurry with internal dewatering to the coarse slurry tank; the output end of the second coal slurry pump is connected with the input end of the fine grinding machine system so as to pump the coal slurry in the coarse slurry tank to the fine grinding machine system.
In one possible implementation, the fine mill system includes a fine mill, a third molecular vibrator, a fine slurry tank, and a third slurry pump; the input end of the fine grinding machine is connected with the output end of the secondary separation system so as to grind the coal slurry output by the secondary separation system again; the fine grinding machine, the third molecular vibration instrument and the fine slurry tank are sequentially connected in series so as to carry out internal dewatering operation on the coal slurry after being ground again and finally input the coal slurry into the fine slurry tank; the input end of the third coal slurry pump is connected with the fine slurry tank, and the output end of the third coal slurry pump is connected with the input end of the rod mill system so as to input the coal slurry input into the fine slurry tank into the rod mill system again for mixing.
In one possible implementation, the secondary classifier is connected to the fine slurry tank by a pipeline to directly deliver a portion of the secondary classified coal slurry to the fine slurry tank.
A method of increasing a coal slurry concentration in a treatment system, comprising the steps of:
step one, starting the rod mill, mixing raw coal, water and additives together, and putting the mixture into the rod mill for grinding and pulping;
starting the overflow classifier, directly entering part of the coal slurry after grinding and pulping into the first molecular vibrator through a coal slurry pipeline from an outlet rotary screen of the rod mill, and simultaneously entering the rest part of the coal slurry after grinding and pulping into the overflow classifier from the outlet rotary screen of the rod mill, carrying out preliminary separation on the coal slurry and finally entering the first molecular vibrator;
starting the first molecular vibrator, and enabling the coal slurry after preliminary separation to 'drive out' part of water in the coal slurry under the action of the first molecular vibrator and fall into the low-pressure coal slurry tank under the action of gravity;
step four, starting the first coal slurry pump, pumping part of the coal slurry in the low-pressure coal slurry tank to the gasification pipeline, and simultaneously pumping 10-20% of the coal slurry in the low-pressure coal slurry tank to the secondary classifier through a distributing valve;
step five, starting the secondary classifier and the second molecular vibration instrument, enabling coarse particles separated by the secondary classifier to directly enter the fine slurry tank, enabling fine particles separated by the secondary classifier to enter the second molecular vibration instrument to 'drive out' part of water in the fine particles again, and enabling the water to fall into the coarse slurry tank under the action of gravity;
step six, adding a certain amount of water into the coarse slurry tank according to a proportion to dilute the coal slurry to 45-50%;
step seven, starting the second coal slurry pump, the fine grinding machine and the third molecular vibration instrument, conveying the diluted fine particles in the coarse slurry tank to the fine grinding machine for grinding again, carrying out superfine grinding on the fine particles by the fine grinding machine to obtain nano-scale fine coal slurry (average particle size is less than or equal to 20 mu m), further continuously 'expelling' part of water in the nano-scale fine coal slurry by the third molecular vibration instrument, and finally automatically flowing into the fine slurry tank to finally obtain the fine coal slurry;
and step eight, starting the third coal slurry pump, and conveying the prepared fine coal slurry to an inlet chute or an outlet drum screen of the rod mill through the third coal slurry pump according to a set proportion and a set flow, and fully mixing the fine coal slurry with the coal slurry ground by the rod mill to obtain high-concentration coal slurry with good fluidity and grading.
One or more technical solutions provided in the present application have at least the following technical effects or advantages:
according to the method, the rod mill system, the primary grading system, the secondary grading system and the fine mill system are arranged, the primary grading system is connected between the input end of the rod mill system and the output end of the rod mill system, so that coal slurry entering the rod mill system is subjected to primary separation through the primary grading system, and meanwhile, the problem that slurry leakage and overflow frequently occur in a roller screen at an outlet of the rod mill is solved; the output end of the rod mill system is respectively connected with the gasification pipeline and the input end of the secondary separation system so as to gasify part of the coal slurry and input the rest coal slurry into the secondary separation system; then, a secondary grading system is arranged and connected with the fine grinding machine system, so that the coal slurry input into the secondary grading system is further separated, and the further separated coal slurry is input into the fine grinding machine system for grinding; finally, the output end of the fine grinding machine system is connected with the input end of the rod mill system, so that the ground coal slurry is input into the rod mill system again for mixing. The method effectively solves the technical problems that the prepared coal slurry in the prior art is high in viscosity, poor in rheological property and atomization, insufficient in curing degree and low in concentration of the coal slurry, influences the overall operation efficiency of a gasification furnace and frequently causes slurry leakage overflow phenomenon through a roller screen at an outlet of a rod mill, improves the curing degree of the coal slurry, increases the fluidity of the coal slurry, further improves the concentration of the coal slurry and avoids the slurry leakage overflow phenomenon of the rod mill, and finally forms the coal slurry with high fluidity and high concentration.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments of the present invention or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow diagram of a conventional single mill pulping process of the prior art;
FIG. 2 is a schematic process flow diagram of a treatment system for increasing the concentration of a slurry of coal according to an embodiment of the present application.
Reference numerals: 1-a rod mill system; 11-rod mill; 12-a low-pressure coal slurry tank; 13-a first slurry pump; 2-a first-stage classification system; 21-overflow classifier; 22-a first molecular vibrometer; 23-coal slurry pipeline; a 3-secondary stage classification system; 31-a secondary classifier; 32-a second molecular vibrometer; 33-a coarse stock tank; 34-a second slurry pump; 4-a fine mill system; 41-fine grinding; 42-a third molecular vibrometer; 43-fine slurry tank; 44-a third slurry pump; a 5-gasification line; 6-a coal slurry tank; 7-a coal slurry pump; 8-slurry storage tank.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all 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.
In the description of the embodiments of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the embodiments of the present invention and simplify description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 embodiments of the present invention will be understood by those of ordinary skill in the art according to specific circumstances.
Referring to FIG. 2, a processing system for increasing the concentration of coal slurry provided in an embodiment of the present application includes a rod mill 11 system 1, a primary classification system 2, a secondary classification system 3, and a fine mill system 4; a first-stage classification system 2 is connected between the input end of the rod mill system 1 and the output end of the rod mill system 1 so as to perform preliminary separation on coal slurry entering the rod mill system 1 through the first-stage classification system 2; the output end of the rod mill system 1 is respectively connected with a gasification pipeline 5 and the input end of the secondary separation system 3 so as to gasify part of coal slurry and input the rest coal slurry into the secondary separation system 3; the secondary grading system 3 is connected with the fine grinding machine system 4 to further separate the coal slurry input into the secondary grading system 3, and the further separated coal slurry is input into the fine grinding machine system 4 for grinding; the output end of the fine grinding machine system 4 is connected with the input end of the rod mill system 1 so as to input the ground coal slurry into the rod mill system 1 again for mixing.
Referring to FIG. 2, a rod mill system 1 includes a rod mill 11, a low pressure coal slurry tank 12, and a first coal slurry pump 13; a first-stage classification system 2 is connected between an outlet drum screen of the rod mill 11 and the low-pressure coal slurry tank 12; the first coal slurry pump 13 is connected with the low-pressure coal slurry tank 12, and the output end of the first coal slurry pump 13 is respectively connected with the gasification pipeline 5 and the secondary separation system 3 so as to pump out the coal slurry in the low-pressure coal slurry tank 12 and respectively convey the coal slurry to the gasification pipeline 5 and the secondary separation system 3. In the embodiment of the application, raw coal, water and additives are added into a rod mill 11 in a coal slurry preparation workshop to be ground and pulped together, a primary grading system 2 is connected between an outlet drum screen of the rod mill 11 and a low-pressure coal slurry tank 12 through a pipeline, the coal slurry ground and prepared in the rod mill 11 is subjected to primary separation through the primary grading system 2, and the primary grading system 2 can simultaneously solve the pulp leakage problem of the rod mill 11; the coal slurry in the low-pressure coal slurry tank 12 is sent to a downstream gasification user by arranging a distributing valve at the output end of the first coal slurry pump 13, and 10-20% of the coal slurry is conveyed from the low-pressure coal slurry tank 12 to the secondary grading system 3 by the distributing valve.
Referring to fig. 2, the primary classification system 2 includes an overflow classifier 21 and a first molecular vibrator 22; the input end of the overflow classifier 21 is communicated with an outlet drum screen of the rod mill 11 so as to perform primary separation on coal slurry overflowed from the rod mill 11; the first molecular vibrator 22 is communicated with the output end of the overflow classifier 21 to carry out internal dewatering operation on the coal slurry after preliminary separation. A coal slurry pipeline 23 is communicated between the first molecular vibrator 22 and the outlet rotary screen of the rod mill 11. The overflow diverter is arranged in the embodiment of the application, so that large particles and impurities can be removed from the coal slurry output by the exit roller screen of the rod mill 11, the problem of overflow slurry leakage of the rod mill 11 can be solved, and meanwhile, the primary separation of the coal slurry obtained by grinding in the rod mill 11 is realized; after the coal slurry enters the first molecular vibrator 22, part of the internal water in the coal particles overflows, namely part of the internal water in the coal particles is "driven out", and meanwhile, the coal slurry can be fully cured after intermolecular vibration, so that the fluidity is enhanced; in the embodiment of the application, the output end of the overflow classifier 21 can be directly communicated with the coal slurry pipeline 23, and the primarily separated coal slurry is mixed with the coal slurry in the coal slurry pipeline 23 and then enters the first molecular vibrator 22 for dewatering.
Referring to fig. 2, the secondary classification system 3 includes a secondary classifier 31, a second molecular vibrator 32, a coarse slurry tank 33, and a second slurry pump 34; the input end of the secondary classifier 31 is connected with the output end of the rod mill system 1 so as to further separate the coal slurry input into the secondary classifier 31; the output end of the secondary classifier 31 is respectively connected with a second molecular vibrator 32 and a fine grinding machine system 4 so as to respectively convey the further separated coal slurry to the second molecular vibrator 32 and the fine grinding machine system 4; the second molecular vibrator 32, the coarse slurry tank 33 and the second slurry pump 34 are sequentially connected in series to perform internal dewatering operation on the slurry input to the second molecular vibrator 32, and input the slurry after internal dewatering to the coarse slurry tank 33; the output of the second slurry pump 34 is connected to the input of the fine mill system 4 to pump the slurry of coal in the coarse slurry tank 33 to the fine mill system 4. In this embodiment, part of the coal slurry in the low-pressure coal slurry tank 12 is pumped out to the secondary classifier 31 by the first coal slurry pump 13 for secondary classification, the classified fine particles enter the second molecular vibration instrument 32, so that part of water in the coal particles overflows again, namely, part of water in the coal particles is 'driven out', meanwhile, the coal slurry can be fully cured after intermolecular vibration, the fluidity is further enhanced, the separated fine particle coal slurry after secondary classification enters the coarse slurry tank 33, the separated coarse particle coal slurry directly enters the fine slurry tank 43, and the fine particle coal slurry entering the coarse slurry tank 33 is conveyed to the fine grinding machine system 4 by the second coal slurry pump 34.
Referring to FIG. 2, fine mill system 4 includes a fine mill 41, a third molecular vibrator 42, a fine slurry tank 43, and a third slurry pump 44; the input end of the fine grinding machine 41 is connected with the output end of the secondary separation system 3 so as to grind the coal slurry output by the secondary separation system 3 again; the fine grinding machine 41, the third molecular vibrator 42 and the fine slurry tank 43 are connected in series in order to carry out internal dewatering operation again on the secondary ground coal slurry, and finally input into the fine slurry tank 43; the input end of the third slurry pump 44 is connected with the fine slurry tank 43, and the output end of the third slurry pump 44 is connected with the input end of the rod mill system 1, so that the slurry input into the fine slurry tank 43 is input into the rod mill system 1 again for mixing. In the embodiment of the application, a certain amount of water is added into a coarse slurry tank 33 according to a proportion to dilute coarse slurry to 45-50%, a second slurry pump 34 conveys the primarily ground fine particle coal slurry to a fine mill 41 to grind again, the fine slurry is subjected to superfine grinding by the fine mill 41 to obtain nano-scale superfine coal slurry (average particle size is less than or equal to 20 mu m), about 45-50% of nano-scale superfine coal slurry continuously drives out internal water by a third molecular vibrator 42, then the internal water flows into a fine slurry tank 43 and is mixed with coarse particle coal slurry separated from a secondary classifier 31, so that fine coal slurry is prepared, and the prepared fine coal slurry is conveyed into an inlet chute of a rod mill 11 or an outlet drum sieve by a third slurry pump 44 according to a set proportion and flow; the final fine slurry is fully mixed with the coal slurry ground by the rod mill 11 in the rod mill 11 and at the rotary screen to produce high-concentration coal slurry with good fluidity and grading.
Referring to fig. 2, the secondary classifier 31 is connected to the fine slurry tank 43 through a pipe so as to directly transfer a part of the secondary classified coal slurry to the fine slurry tank 43.
A method of increasing a coal slurry concentration in a treatment system, comprising the steps of:
step one, starting the rod mill 11, mixing raw coal, water and additives together, and putting the mixture into the rod mill 11 for grinding and pulping;
starting the overflow classifier 21, directly feeding a part of the coal slurry subjected to grinding and pulping into the first molecular vibrator 22 through a coal slurry pipeline 23 from an outlet drum screen of the rod mill 11, and simultaneously feeding the rest of the coal slurry subjected to grinding and pulping into the overflow classifier 21 from the outlet drum screen of the rod mill 11, carrying out primary separation on the coal slurry, and finally feeding the coal slurry into the first molecular vibrator 22;
step three, starting the first molecular vibration meter 22, and enabling the coal slurry after preliminary separation to "drive out" part of water in the coal slurry under the action of the first molecular vibration meter 22 and fall into the low-pressure coal slurry tank 12 under the action of gravity;
step four, starting the first coal slurry pump 13, pumping part of the coal slurry in the low-pressure coal slurry tank 12 to the gasification pipeline 5, and simultaneously pumping 10-20% of the coal slurry in the low-pressure coal slurry tank 12 to the secondary classifier 31 through a distributing valve;
step five, starting the secondary classifier 31 and the second molecular vibration meter 32, wherein coarse particles separated by the secondary classifier 31 directly enter the fine slurry tank 43, fine particles separated by the secondary classifier 31 enter the second molecular vibration meter 32 to "drive out" part of water in the fine particles again, and fall into the coarse slurry tank 33 under the action of gravity;
step six, adding a certain amount of water into the coarse slurry tank 33 according to a proportion to dilute the coal slurry to 45-50%;
step seven, the second coal slurry pump 34, the fine grinding machine 41 and the third molecular vibration device 42 are started, diluted fine particles in the coarse slurry tank 33 are conveyed to the fine grinding machine 41 for grinding again, the fine coal slurry reaching the nano level after being subjected to superfine grinding by the fine grinding machine 41 (the average particle size is less than or equal to 20 mu m), part of water in the nano level fine coal slurry is continuously 'driven out' through the third molecular vibration device 42, and finally, the water automatically flows into the fine slurry tank 43, and finally, the fine coal slurry is prepared;
and step eight, starting the third coal slurry pump 44, and conveying the prepared fine coal slurry to an inlet chute or an outlet drum screen of the rod mill 11 through the third coal slurry pump 44 according to a set proportion and a set flow rate, and fully mixing the fine coal slurry with the coal slurry ground by the rod mill 11 to obtain high-concentration coal slurry with good fluidity and grading.
The processing principle of the processing system for improving the concentration of coal slurry provided by the embodiment of the application is as follows:
after water, raw coal and additives are added into the rod mill 11, firstly, the rod mill 11 is used for grinding and pulping, an overflow classifier 21 is additionally arranged at a drum screen at the outlet of the rod mill 11, and large particles and impurities are removed through the overflow classifier 21, so that the problem of pulp leakage can be solved. The coal slurry enters the first molecular vibrator 22, so that part of internal water in the coal particles overflows, and meanwhile, the coal slurry can be fully cured after intermolecular vibration, and the fluidity is enhanced. Part of the coal slurry in the low-pressure coal slurry tank 12 is conveyed to the secondary classifier 31 for secondary classification, then enters the secondary molecular vibrator 32 again, part of water in the coal particles overflows again, the fine particle coal slurry enters the coarse slurry tank 33, and the coarse particle coal slurry directly enters the fine slurry tank 43. The coarse slurry in the coarse slurry tank 33 is again sent to the fine mill 41 for nano-scale grinding, which plays a key role in increasing the concentration of the coal slurry, and then enters the third molecular vibrator 42 again to vibrate and overflow the inner water in the coal particles as much as possible. Finally, the mixture is mixed with the coarse coal slurry from the rod mill 11, and high-fluidity high-concentration coal slurry is formed again under the vibration of the first molecular vibrator 22 with different power and frequency.
In this specification, each embodiment is described in a progressive manner, and the same or similar parts of each embodiment are referred to each other, and each embodiment is mainly described as a difference from other embodiments.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the present application; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions.

Claims (2)

1. A processing system for increasing the concentration of coal slurry, which is characterized by comprising a rod mill system (1), a primary grading system (2), a secondary grading system (3) and a fine mill system (4);
the primary classification system (2) is connected between the input end of the rod mill system (1) and the output end of the rod mill system (1) so as to perform primary separation on coal slurry entering the rod mill system (1) through the primary classification system (2);
the output end of the rod mill system (1) is respectively connected with a gasification pipeline (5) and the input end of the secondary separation system (3) so as to gasify part of the coal slurry and input the rest of the coal slurry into the secondary separation system (3);
the secondary stage separation system (3) is connected with the fine grinding machine system (4) so as to further separate the coal slurry input into the secondary stage separation system (3), and the coal slurry after further separation is input into the fine grinding machine system (4) for grinding;
the output end of the fine grinding machine system (4) is connected with the input end of the rod mill system (1) so as to input the ground coal slurry into the rod mill system (1) again for mixing;
the rod mill system (1) comprises a rod mill (11), a low-pressure coal slurry tank (12) and a first coal slurry pump (13);
the primary classification system (2) is connected between the outlet rotary screen of the rod mill (11) and the low-pressure coal slurry tank (12);
the first coal slurry pump (13) is connected with the low-pressure coal slurry tank (12), and the output end of the first coal slurry pump (13) is respectively connected with the gasification pipeline (5) and the secondary grading system (3) so as to extract the coal slurry in the low-pressure coal slurry tank (12) and respectively convey the coal slurry to the gasification pipeline (5) and the secondary grading system (3);
the primary classification system (2) comprises an overflow classifier (21) and a first molecular vibrator (22);
the input end of the overflow classifier (21) is communicated with an outlet rotary screen of the rod mill (11) so as to perform primary separation on the coal slurry overflowed from the rod mill (11);
the first molecular vibrator (22) is communicated with the output end of the overflow classifier (21) so as to carry out internal dewatering operation on the coal slurry after preliminary separation;
a coal slurry pipeline (23) is communicated between the first molecular vibrator (22) and the outlet rotary screen of the rod mill (11);
the secondary classification system (3) comprises a secondary classifier (31), a second molecular vibrator (32), a coarse slurry tank (33) and a second coal slurry pump (34);
the input end of the secondary classifier (31) is connected with the output end of the rod mill system (1) so as to further separate the coal slurry input into the secondary classifier (31);
the output end of the secondary classifier (31) is respectively connected with the second molecular vibrator (32) and the fine grinding machine system (4) so as to respectively convey the further separated coal slurry to the second molecular vibrator (32) and the fine grinding machine system (4);
the second molecular vibrator (32), the coarse slurry tank (33) and the second slurry pump (34) are sequentially connected in series to perform internal dewatering operation on the slurry input to the second molecular vibrator (32) and input the slurry after internal dewatering to the coarse slurry tank (33);
the output end of the second coal slurry pump (34) is connected with the input end of the fine grinding system (4) so as to pump the coal slurry in the coarse slurry tank (33) to the fine grinding system (4);
the fine grinding machine system (4) comprises a fine grinding machine (41), a third molecular vibration instrument (42), a fine slurry tank (43) and a third coal slurry pump (44);
the input end of the fine grinding machine (41) is connected with the output end of the secondary separation system (3) so as to grind the coal slurry output by the secondary separation system (3) again;
the fine grinding machine (41), the third molecular vibration instrument (42) and the fine slurry tank (43) are sequentially connected in series so as to carry out internal dewatering operation on the coal slurry after being ground again and finally input the coal slurry into the fine slurry tank (43);
the input end of the third coal slurry pump (44) is connected with the fine slurry tank (43), and the output end of the third coal slurry pump (44) is connected with the input end of the rod mill system (1) so as to input the coal slurry input into the fine slurry tank (43) into the rod mill system (1) again for mixing;
the secondary classifier (31) is connected with the fine slurry tank (43) through a pipeline so as to directly convey part of the coal slurry subjected to secondary classification to the fine slurry tank (43).
2. A method of increasing the concentration of a slurry of coal in a treatment system according to claim 1, comprising the steps of:
step one, starting the rod mill (11), and mixing raw coal, water and additives together, and putting the mixture into the rod mill (11) for grinding and pulping;
starting the overflow classifier (21), directly feeding part of the coal slurry subjected to grinding and pulping into the first molecular vibrator (22) from an outlet drum screen of the rod mill (11) through a coal slurry pipeline (23), and simultaneously feeding the rest part of the coal slurry subjected to grinding and pulping into the overflow classifier (21) from the outlet drum screen of the rod mill (11), carrying out primary separation on the coal slurry and feeding into the first molecular vibrator (22);
starting the first molecular vibrator (22), and overflowing part of water in the coal slurry under the action of the first molecular vibrator (22) after primary separation and falling into the low-pressure coal slurry tank (12) under the action of gravity;
step four, starting the first coal slurry pump (13), pumping part of the coal slurry in the low-pressure coal slurry tank (12) to the gasification pipeline (5), and simultaneously pumping 10-20% of the coal slurry in the low-pressure coal slurry tank (12) to the secondary classifier (31) through a distributing valve;
step five, starting the secondary classifier (31) and the second molecular vibration instrument (32), enabling coarse particles separated by the secondary classifier (31) to directly enter the fine slurry tank (43), enabling fine particles separated by the secondary classifier (31) to enter the second molecular vibration instrument (32) again to overflow part of water in the fine particles, and enabling the water to fall into the coarse slurry tank (33) under the action of gravity;
step six, adding a certain amount of water into the coarse slurry tank (33) according to a proportion to dilute the coal slurry to 45-50%;
starting the second coal slurry pump (34), the fine grinding machine (41) and the third molecular vibration instrument (42), conveying the diluted fine particles in the coarse slurry tank (33) to the fine grinding machine (41) for grinding again, carrying out superfine grinding by the fine grinding machine (41) to obtain nano-scale fine coal slurry (average particle size is less than or equal to 20 mu m), continuing to overflow part of internal water of the nano-scale fine coal slurry through the third molecular vibration instrument (42), and finally automatically flowing into the fine slurry tank (43) to finally obtain the fine coal slurry;
and step eight, starting the third coal slurry pump (44), and conveying the prepared fine coal slurry to an inlet chute or an outlet drum screen of the rod mill (11) through the third coal slurry pump (44) according to a set proportion and a set flow rate, and fully mixing the fine coal slurry with the coal slurry ground by the rod mill (11) to obtain high-concentration coal slurry with good fluidity and grading.
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