CN113695070A - Processing system and method for improving coal slurry concentration - Google Patents
Processing system and method for improving coal slurry concentration Download PDFInfo
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- CN113695070A CN113695070A CN202110993411.5A CN202110993411A CN113695070A CN 113695070 A CN113695070 A CN 113695070A CN 202110993411 A CN202110993411 A CN 202110993411A CN 113695070 A CN113695070 A CN 113695070A
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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
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- 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
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- 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
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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
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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- 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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Abstract
The application discloses a processing system and a 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 primary 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 grading system; the secondary classification system is connected with the fine grinding machine system to further separate the coal slurry input into the secondary classification system; the output end of the fine grinding machine system is connected with the input end of the rod grinding machine system, so that the ground coal slurry is input into the rod grinding machine system again to be mixed. The coal slurry aging device solves the technical problems that the coal slurry aging degree is insufficient, the coal slurry concentration is low and the slurry leakage overflow phenomenon frequently occurs through a rod mill outlet drum screen in the prior art, and achieves the purposes of improving the coal slurry aging degree, increasing the coal slurry fluidity, further improving the coal slurry concentration and avoiding the slurry leakage phenomenon of the rod mill.
Description
Technical Field
The application relates to the technical field of coal chemical industry, in particular to a processing system and method for improving coal slurry concentration.
Background
Coal gasification, which is an important component of clean coal technology, has a leading status, and 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 can also be used in the fields of poly-generation and the like based on coal gas. After years of practical exploration, China accumulates abundant operation, management and manufacturing experiences in the aspect of coal water slurry gasification technology, and the coal gasification technology is mature and perfect.
The coal slurry concentration is used as a main parameter of the gasification furnace, which has great influence on gasification rate, coal gas quality, raw material consumption, coal slurry conveying and atomization and the like, if the coal water slurry concentration is too low, the water entering the gasification furnace is increased, the water needs a large amount of heat during evaporation, in order to maintain the furnace temperature, the oxygen amount is increased, the specific oxygen amount is increased, and the content of the effective gas component CO + H2 and the gasification efficiency are reduced.
In the enterprises for producing chemical products by gasifying water-coal slurry into taps in China, the coal slurry is prepared by a single rod mill pulping process (as shown in figure 1), namely coal, an additive and water are ground into coal slurry by a rod mill, the prepared coal slurry enters a coal slurry tank, is pumped into a slurry storage tank by a coal slurry pump, and is finally pumped out and gasified by another coal slurry pump, the process has the defects that the curing degree of the coal slurry is not enough, the concentration of the coal slurry is low, the integral operation efficiency of the gasification furnace is influenced, and once the concentration is increased, the phenomenon of slurry leakage and overflow often occurs through a drum screen at the outlet of the rod mill; in addition, the concentration of the coal slurry prepared by the prior art is usually about 60%, and the defects of high viscosity, poor rheological property and atomization property and the like exist, so that the specific coal consumption and the specific oxygen consumption of coal gasification are higher, the effective gas components are lower, and the economy of coal water slurry gasification is seriously influenced.
Disclosure of Invention
The application solves the technical problems that the coal slurry prepared in the prior art is high in viscosity, poor in rheological property and atomization property, insufficient in curing degree and low in coal slurry concentration, influences the overall operation efficiency of a gasification furnace and frequently generates a slurry leakage overflow phenomenon through a rod mill outlet drum screen, and achieves the purposes of improving the coal slurry curing degree, increasing the coal slurry fluidity, further improving the coal slurry concentration and avoiding the slurry leakage overflow phenomenon of the rod mill.
The treatment system for improving the coal slurry concentration comprises a rod mill system, a primary grading system, a secondary grading system and a fine mill system; 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 primarily separated through the primary grading system; the output end of the rod mill system is respectively connected with a gasification pipeline and the input end of the secondary grading system so as to gasify part of the coal slurry and input the rest coal slurry into the secondary grading system; the secondary classification system is connected with the fine mill system so as to further separate the coal slurry input into the secondary classification system and input the coal slurry after further separation into the fine mill system for grinding; the output end of the fine mill 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.
In one possible implementation, the rod mill system includes a rod mill, a low pressure slurry tank, and a first slurry pump; the primary grading system is connected between the outlet rotary 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 the gasification pipeline and the secondary grading system, so that the coal slurry in the low-pressure coal slurry tank is pumped out and respectively conveyed to the gasification pipeline and the secondary grading system.
In one possible implementation, the primary classification system comprises an overflow classifier and a first molecular vibrator; the input end of the overflow classifier is communicated with an outlet rotary screen of the rod mill so as to carry out primary separation on the coal slurry overflowed by the rod mill; and the first molecular vibration meter is communicated with the output end of the overflow classifier so as to carry out internal dewatering operation on the coal slurry after primary separation. And a coal slurry pipeline is communicated between the first molecular vibration meter and the outlet rotary screen of the rod mill.
In one possible implementation manner, the secondary grading system comprises a secondary grader, a second molecular vibration meter, 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 to the secondary classifier; the output end of the secondary classifier is respectively connected with the second molecular vibration meter and the fine mill system so as to respectively convey the coal slurry after further separation to the second molecular vibration meter and the fine mill system; the second molecular vibration meter, the coarse slurry tank and the second slurry pump are sequentially connected in series to perform internal dewatering operation on the coal slurry input into the second molecular vibration meter, and the coal slurry subjected to internal dewatering is input into the coarse slurry tank; the output end of the second coal slurry pump is connected with the input end of the fine mill system so as to extract the coal slurry in the coarse slurry tank to the fine mill system.
In one possible implementation, the refiner system includes a refiner, a third molecular shaker, 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 classification system so as to grind the coal slurry output by the secondary classification system again; the fine grinding machine, the third molecular vibration meter and the fine slurry tank are sequentially connected in series, so that the coal slurry after being ground again is subjected to internal dewatering operation again and is finally input into the fine slurry tank; the input end of the third coal slurry pump is connected with the fine slurry groove, and the output end of the third coal slurry pump is connected with the input end of the rod mill system, so that the coal slurry input into the fine slurry groove is input into the rod mill system again for mixing.
In a possible implementation manner, the secondary classifier is connected with the fine slurry tank through a pipeline so as to directly convey part of the coal slurry after secondary classification to the fine slurry tank.
A method of a treatment system for increasing a concentration of a coal slurry, comprising the steps of:
step one, starting the rod mill, mixing raw coal, water and an additive together, and putting the mixture into the rod mill for grinding and pulping;
step two, starting the overflow classifier, enabling a part of the coal slurry after grinding and pulping to directly enter the first molecular vibration meter from an outlet rotary screen of the rod mill through a coal slurry pipeline, and enabling the rest of the coal slurry after grinding and pulping to enter the overflow classifier from the outlet rotary screen of the rod mill, preliminarily separating the coal slurry and enabling the coal slurry to recently enter the first molecular vibration meter;
starting the first molecular vibration instrument, and driving out part of water in the coal slurry after the initial separation under the action of the first molecular vibration instrument and allowing the coal slurry to 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 material distributing valve;
step five, starting the secondary classifier and the second molecular vibration meter, directly feeding the coarse particles separated by the secondary classifier into the fine slurry tank, feeding the fine particles separated by the secondary classifier into the second molecular vibration meter to drive out part of water in the fine particles again, and dropping the fine particles 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 meter, conveying the diluted fine particles in the coarse slurry tank to the fine grinding machine for grinding again, performing superfine grinding by the fine grinding machine to obtain nanoscale fine coal slurry (the average particle size is less than or equal to 20 microns), further continuously driving out part of water in the nanoscale fine coal slurry by the third molecular vibration meter, and finally automatically flowing into the fine slurry tank to finally prepare the fine coal slurry;
and step eight, starting the third coal slurry pump, feeding the prepared fine coal slurry into 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 rate, and fully mixing the fine coal slurry and the coal slurry ground by the rod mill to produce high-concentration coal slurry with good fluidity and gradation.
One or more technical solutions provided in the present application have at least the following technical effects or advantages:
the system comprises a rod mill system, a primary grading system, a secondary grading system and a fine mill system, wherein 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 primarily separated through the primary grading system, and the problem of slurry leakage and overflow frequently occurring in a drum screen at the 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 grading system so as to gasify part of the coal slurry and input the rest coal slurry into the secondary grading system; then a secondary grading system is arranged to be 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 to be ground; and finally, the output end of the fine grinding mill 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 technical problems that the overall operation efficiency of the gasification furnace is affected and the phenomenon of slurry leakage and overflow frequently occurs through an outlet drum screen of a rod mill due to the fact that the prepared coal slurry is high in viscosity, poor in rheological property and atomization property, insufficient in curing degree and low in coal slurry concentration in the prior art are effectively solved, the effects of improving the curing degree of the coal slurry, increasing the fluidity of the coal slurry, further improving the concentration of the coal slurry, avoiding the phenomenon of slurry leakage and overflow of the rod mill and finally forming the high-fluidity and high-concentration coal slurry are achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments of the present invention or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a simplified 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 coal slurry according to an embodiment of the present application.
Reference numerals: 1-a rod mill system; 11-rod mill; 12-low pressure slurry tank; 13-a first coal slurry pump; 2-a first-level grading system; 21-overflow classifier; 22-a first molecular vibrometer; 23-a coal slurry pipeline; 3-a two-stage classification system; 31-a secondary classifier; 32-a second molecular vibrometer; 33-a coarse slurry tank; 34-a second coal slurry pump; 4-a fine mill system; 41-fine grinding machine; 42-third molecular vibrometer; 43-fine pulp tank; 44-a third slurry pump; 5-a gasification pipeline; 6-coal slurry tank; 7-coal slurry pump; 8-slurry storage tank.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present 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 orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, 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," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
Referring to fig. 2, a treatment system for increasing the concentration of coal slurry provided by the embodiment of the present application includes a rod mill 11 system 1, a primary classification system 2, a secondary classification system 3, and a refiner system 4; a primary grading 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 that the coal slurry entering the rod mill system 1 is primarily separated through the primary grading system 2; the output end of the rod mill system 1 is respectively connected with the gasification pipeline 5 and the input end of the secondary grading system 3 so as to gasify part of the coal slurry and input the rest coal slurry into the secondary grading system 3; the secondary grading system 3 is connected with the fine grinding machine system 4 so as to further separate the coal slurry input into the secondary grading system 3 and input the further separated coal slurry into the fine grinding machine system 4 for grinding; the output of the refiner system 4 is connected to the input of the rod mill system 1 in order to feed the milled coal slurry again into the rod mill system 1 for mixing.
Referring to fig. 2, the rod mill system 1 includes a rod mill 11, a low pressure slurry tank 12, and a first slurry pump 13; a primary grading system 2 is connected between an 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 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 grading 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 made into slurry, a primary grading system 2 is connected between an outlet rotary screen of the rod mill 11 and a low-pressure coal slurry tank 12 through a pipeline, the coal slurry ground in the rod mill 11 is primarily separated through the primary grading system 2, and the primary grading system 2 can simultaneously solve the problem of slurry leakage of the rod mill 11; the output end of the first coal slurry pump 13 is provided with a material distributing valve to convey coal slurry in the low-pressure coal slurry tank 12 to downstream gasification users, and the output end of the first coal slurry pump is provided with a material distributing valve to convey 10-20% of coal slurry from the low-pressure coal slurry tank 12 to the secondary grading system 3.
Referring to fig. 2, the primary classification system 2 includes an overflow classifier 21 and a first molecular shaker 22; the input end of the overflow classifier 21 is communicated with an outlet rotary screen of the rod mill 11 so as to carry out primary separation on coal slurry overflowed from the rod mill 11; the first molecular vibration meter 22 is communicated with the output end of the overflow classifier 21 to perform internal dewatering operation on the primarily separated coal slurry. A coal slurry pipeline 23 is communicated between the first molecular vibration meter 22 and the outlet rotary screen of the rod mill 11. The overflow splitter is arranged in the embodiment of the application, so that large particles and impurities can be removed from the coal slurry output from the outlet rotary screen of the rod mill 11, the problem of overflow and slurry leakage of the rod mill 11 can be solved, and the coal slurry prepared by grinding in the rod mill 11 can be primarily separated; after the coal slurry enters the first molecular vibration instrument 22, part of the internal water in the coal particles overflows, namely the internal water in the coal particles is expelled, and meanwhile, the coal slurry can be fully cured after intermolecular vibration, so that the fluidity is enhanced; in the embodiment of the present application, the output end of the overflow classifier 21 may 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 vibration meter 22 for dewatering operation.
Referring to fig. 2, the secondary classification system 3 includes a secondary classifier 31, a second molecular shaker 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 to further separate the coal slurry input to the secondary classifier 31; the output end of the secondary classifier 31 is respectively connected with a second molecular vibration meter 32 and a fine grinding machine system 4, so that the coal slurry after further separation is respectively conveyed to the second molecular vibration meter 32 and the fine grinding machine system 4; the second molecular vibration meter 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 vibration meter 32, and the internally dewatered slurry is input to the coarse slurry tank 33; the output of the second slurry pump 34 is connected to the input of the refiner system 4 to pump the slurry in the coarse slurry tank 33 to the refiner system 4. In the embodiment of the present application, part of the coal slurry in the low-pressure coal slurry tank 12 is pumped out to the secondary classifier 31 through the first coal slurry pump 13 for secondary classification, the classified fine particles enter the second molecular vibration meter 32, so that part of the water in the coal particles overflows again, that is, part of the water in the coal particles is "expelled", meanwhile, the coal slurry can be sufficiently aged through intermolecular vibration, the fluidity is further enhanced, the fine particle coal slurry separated 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 mill system 4 through the second coal slurry pump 34.
Referring to FIG. 2, the refiner system 4 includes a refiner 41, a third molecular shaker 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 grading system 3 so as to grind the coal slurry output by the secondary grading system 3 again; the fine mill 41, the third molecular vibration meter 42 and the fine slurry tank 43 are connected in series in this order to perform the internal dewatering operation again on the coal slurry after the re-grinding, and finally input the coal slurry into the fine slurry tank 43; an input end of the third slurry pump 44 is connected to the fine slurry tank 43, and an output end of the third slurry pump 44 is connected to an input end of the rod mill system 1, so that the slurry input into the fine slurry tank 43 is input to 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 certain proportion to dilute the coarse slurry to 45-50%, a second slurry pump 34 conveys the primarily ground fine particle coal slurry to a fine grinding machine 41 for grinding again, the fine slurry is subjected to superfine grinding by the fine grinding machine 41 to reach nanoscale superfine coal slurry (the average particle size is less than or equal to 20 microns), about 45-50% of the nanoscale superfine coal slurry is continuously driven out by a third molecular vibration instrument 42, then automatically flows into a fine slurry tank 43 and is mixed with the coarse particle coal slurry separated from a secondary classifier 31, so that the fine coal slurry is prepared, and the prepared fine coal slurry is sent into an inlet chute or an outlet drum screen of a rod mill 11 according to a set proportion and flow rate by a third slurry pump 44; the final fine slurry is thoroughly mixed with the coal slurry ground by the rod mill 11 inside the rod mill 11 and at the trommel screen to produce high concentration coal slurry with good fluidity and gradation.
Referring to fig. 2, the secondary classifier 31 is connected to the fine slurry tank 43 through a pipe to directly deliver a part of the coal slurry after the secondary classification to the fine slurry tank 43.
A method of a treatment system for increasing a concentration of a coal slurry, 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;
step two, starting the overflow classifier 21, directly feeding a part of the coal slurry after grinding and pulping into the first molecular vibration meter 22 from an outlet rotary screen of the rod mill 11 through a coal slurry pipeline 23, and simultaneously feeding the rest of the coal slurry after grinding and pulping into the overflow classifier 21 from the outlet rotary screen of the rod mill 11, primarily separating the coal slurry, and feeding the coal slurry into the first molecular vibration meter 22 recently;
step three, starting the first molecular vibration meter 22, and driving out part of water in the coal slurry after the initial separation under the action of the first molecular vibration meter 22, and enabling the coal slurry to 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 material distributing valve;
step five, starting the secondary classifier 31 and the second molecular vibration meter 32, directly feeding the coarse particles separated by the secondary classifier 31 into the fine slurry tank 43, feeding the fine particles separated by the secondary classifier 31 into the second molecular vibration meter 32 to drive out part of water in the fine particles again, and dropping the water 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 certain proportion to dilute the coal slurry to 45-50%;
step seven, starting the second coal slurry pump 34, the fine mill 41 and the third molecular vibration meter 42, conveying the diluted fine particles in the coarse slurry tank 33 to the fine mill 41 for grinding again, performing superfine grinding by the fine mill 41 to obtain nanoscale fine coal slurry (the average particle size is less than or equal to 20 microns), further continuously driving out part of the nanoscale fine coal slurry by the third molecular vibration meter 42, and finally automatically flowing into the fine slurry tank 43 to finally prepare the fine coal slurry;
and step eight, starting the third coal slurry pump 44, feeding the prepared fine coal slurry into 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 produce high-concentration coal slurry with good fluidity and gradation.
The processing principle of the processing system for improving the coal slurry concentration provided by the embodiment of the application is as follows:
after water, raw coal and additives are added into the rod mill 11, grinding and pulping are firstly carried out through the rod mill 11, an overflow classifier 21 is additionally arranged at a rotary 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 vibration instrument 22, so that a 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, and then enters the second molecular vibration instrument 32 again, part of the moisture 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 sent to a fine mill 41 for nano-grade grinding, which plays a key role in increasing the concentration of the coal slurry, and then enters a third molecular vibration device 42 again to shake out the internal water in the coal particles as much as possible. Finally, the coal slurry is mixed with the coarse coal slurry from the rod mill 11, and the high-fluidity high-concentration coal slurry is formed again under the vibration of different powers and frequencies of the first molecular vibration instrument 22.
The embodiments in the present specification are described in a progressive manner, and the same or similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure.
Claims (7)
1. A processing system for improving the concentration of coal slurry 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 grading 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 carry out primary separation on coal slurry entering the rod mill system (1) through the primary grading 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 grading system (3) so as to gasify part of the coal slurry and input the rest coal slurry into the secondary grading system (3);
the secondary classification system (3) is connected with the fine mill system (4) so as to further separate the coal slurry input into the secondary classification system (3) and input the coal slurry after further separation into the fine mill system (4) for grinding;
the output end of the fine mill 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.
2. The coal slurry concentration increasing processing system according to claim 1, wherein 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 grading system (2) is connected between an 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), 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 that the coal slurry in the low-pressure coal slurry tank (12) is pumped out and respectively conveyed to the gasification pipeline (5) and the secondary grading system (3).
3. The coal slurry concentration increasing processing system according to claim 2, wherein the primary classification system (2) comprises an overflow classifier (21) and a first molecular vibration meter (22);
the input end of the overflow classifier (21) is communicated with an outlet rotary screen of the rod mill (11) so as to carry out primary separation on the coal slurry overflowed from the rod mill (11);
the first molecular vibration meter (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 primary separation;
a coal slurry pipeline (23) is communicated between the first molecular vibration meter (22) and an outlet rotary screen of the rod mill (11).
4. The coal slurry concentration increasing treatment system according to claim 1, wherein the two-stage classification system (3) comprises a secondary classifier (31), a second molecular vibration meter (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 to the secondary classifier (31);
the output end of the secondary classifier (31) is respectively connected with the second molecular vibration meter (32) and the fine mill system (4) so as to respectively convey the coal slurry after further separation to the second molecular vibration meter (32) and the fine mill system (4);
the second molecular vibration meter (32), the coarse slurry tank (33) and the second slurry pump (34) are sequentially connected in series so as to perform internal dewatering operation on the slurry input to the second molecular vibration meter (32) and input the internally dewatered slurry 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 mill system (4) so as to pump the coal slurry in the coarse slurry tank (33) to the fine mill system (4).
5. The coal slurry concentration increasing processing system according to claim 4, wherein the refiner system (4) comprises a refiner (41), a third molecular vibrator (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 classification system (3) so as to grind the coal slurry output by the secondary classification system (3) again;
the fine grinding machine (41), the third molecular vibration meter (42) and the fine slurry tank (43) are sequentially connected in series, so that the coal slurry after being ground again is subjected to internal dewatering operation again and is finally input into the fine slurry tank (43);
the input end of the third coal slurry pump (44) is connected with the fine slurry groove (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 groove (43) into the rod mill system (1) again for mixing.
6. The coal slurry concentration increasing treatment system according to claim 5, wherein 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 after secondary classification to the fine slurry tank (43).
7. A method of a treatment system for increasing the concentration of coal slurry, which is based on any one of claims 1 to 6, and is characterized by comprising the following steps:
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;
step two, starting the overflow classifier (21), enabling a part of the coal slurry after grinding and pulping to directly enter the first molecular vibration meter (22) from an outlet rotary screen of the rod mill (11) through a coal slurry pipeline (23), and simultaneously enabling the rest of the coal slurry after grinding and pulping to enter the overflow classifier (21) from the outlet rotary screen of the rod mill (11), primarily separating the coal slurry and recently entering the first molecular vibration meter (22);
step three, starting the first molecular vibration instrument (22), and driving out part of water in the coal slurry after the primary separation under the action of the first molecular vibration instrument (22) and enabling the coal slurry to fall into the low-pressure coal slurry tank (12) under the action of gravity;
step four, starting the first coal slurry pump (13), pumping out part of the coal slurry in the low-pressure coal slurry tank (12) to the gasification pipeline (5), and simultaneously pumping out 10-20% of the coal slurry in the low-pressure coal slurry tank (12) to the secondary classifier (31) through a material distribution valve;
step five, starting the secondary classifier (31) and the second molecular vibration meter (32), directly feeding the coarse particles separated by the secondary classifier (31) into the fine slurry tank (43), feeding the fine particles separated by the secondary classifier (31) into the second molecular vibration meter (32) to drive out part of water in the fine particles again, and dropping the water 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, starting the second coal slurry pump (34), the fine mill (41) and the third molecular vibration meter (42), conveying the diluted fine particles in the coarse slurry tank (33) to the fine mill (41) for grinding again, carrying out superfine grinding by the fine mill (41) to obtain nanoscale fine coal slurry (the average particle size is less than or equal to 20 mu m), further continuously driving out part of water in the nanoscale fine coal slurry by the third molecular vibration meter (42), and finally automatically flowing into the fine slurry tank (43) to finally prepare fine coal slurry;
and step eight, starting the third coal slurry pump (44), feeding the prepared fine coal slurry into an inlet chute or an outlet rotary 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 produce high-concentration coal slurry with good fluidity and gradation.
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