CN115058267A - Coal water slurry concentration method and coal water slurry concentration device - Google Patents
Coal water slurry concentration method and coal water slurry concentration device Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 170
- 239000002002 slurry Substances 0.000 title claims abstract description 151
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 146
- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000000203 mixture Substances 0.000 claims abstract description 62
- 238000000227 grinding Methods 0.000 claims abstract description 39
- 239000008235 industrial water Substances 0.000 claims abstract description 26
- 239000000654 additive Substances 0.000 claims abstract description 19
- 230000000996 additive effect Effects 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 18
- 238000001238 wet grinding Methods 0.000 claims abstract description 16
- 238000001914 filtration Methods 0.000 claims abstract description 12
- 238000003860 storage Methods 0.000 claims description 5
- 238000002485 combustion reaction Methods 0.000 abstract description 15
- 230000008901 benefit Effects 0.000 abstract description 9
- 239000000047 product Substances 0.000 description 21
- 229910052799 carbon Inorganic materials 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 239000003250 coal slurry Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000000498 ball milling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/32—Liquid carbonaceous fuels consisting of coal-oil suspensions or aqueous emulsions or oil emulsions
- C10L1/326—Coal-water suspensions
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Abstract
The invention provides a coal water slurry concentration method and a coal water slurry concentration device, wherein the coal water slurry concentration method comprises the following steps: adding raw coal and industrial water into a first wet grinder for wet grinding processing treatment to prepare a first mixture; conveying the first mixture into a first centrifugal filter, and homogenizing and filtering the first mixture by the first centrifugal filter to prepare a second mixture; adding the second mixture, industrial water and a grinding aid into an ultrafine wet grinder together for grinding processing treatment to prepare primary coal water slurry, wherein the grinding particle size of the ultrafine wet grinder is smaller than that of the first wet grinder; adding the primary coal water slurry, raw coal and additive into a ball mill together for processing to prepare secondary coal water slurry; conveying the second-stage coal water slurry into a second centrifugal filter for filtering treatment to obtain a finished coal water slurry; the finished coal water slurry prepared by the method has excellent stability and fluidity, high combustion heat efficiency during combustion and obvious coal saving advantage.
Description
Technical Field
The invention relates to the technical field of coal water slurry production, in particular to a coal water slurry concentration method and a coal water slurry concentration device.
Background
At present, the coal water slurry is a high-efficiency and clean coal-based special fuel and has the characteristics of high combustion efficiency, low pollutant discharge amount and the like. The concentration of the coal water slurry is directly related to the combustion efficiency and the operation cost of fuel coal water slurry industrial boilers and power station boilers. The concentration of the coal water slurry is improved, the high-efficiency stable operation of a boiler and the economic benefit of enterprises are improved, and the market competitiveness of the coal water slurry is enhanced. The concentration of the coal water slurry is improved, the advantages of the coal resources in China are favorably exerted, the requirements of social development on energy resources are met, the requirements on environmental protection and green low-carbon development are met, and the method has important significance on efficient and clean utilization of the coal resources in China.
The traditional water-coal-slurry preparation technology has the advantages that the slurry concentration is generally low, the mass fraction of slurry is generally 57-60%, the combustion efficiency of the water-coal-slurry is obviously reduced due to the low slurry concentration, and the economical efficiency and the market competitiveness of the water-coal-slurry are seriously influenced.
Disclosure of Invention
The invention provides a coal water slurry concentration method and a coal water slurry concentration device, which aim to solve the problem of low slurry concentration of the coal water slurry in the prior art.
In order to solve the above problems, according to one aspect of the present invention, there is provided a method for concentrating coal-water slurry, comprising the steps of: adding raw coal and industrial water into a first wet grinder for wet grinding processing treatment to prepare a first mixture; conveying the first mixture into a first centrifugal filter, and homogenizing and filtering the first mixture by the first centrifugal filter to prepare a second mixture; adding the second mixture, industrial water and a grinding aid into an ultrafine wet grinder together for grinding processing treatment to prepare primary coal water slurry, wherein the grinding particle size of the ultrafine wet grinder is smaller than that of the first wet grinder; adding the primary coal water slurry, the raw coal and the additive into a ball mill together for processing to prepare secondary coal water slurry; and conveying the second-stage coal water slurry into a second centrifugal filter for filtering treatment to obtain the finished coal water slurry.
Further, the coal water slurry concentration method also comprises the following steps: the mixture which is not filtered by the first centrifugal filter is re-input to the first wet grinder for a second wet grinding process.
Further, the first wet grinder is a vertical wet grinder; adding raw coal and industrial water into a first wet grinder according to the proportion of 1: 1; the second mixture is a coal-water mixture with a 100-mesh passing rate of 85% and a mass fraction of 45% -50%.
Further, adding the second mixture and industrial water into an ultrafine wet mill according to the ratio of 1: 1.5; the mass of the grinding aid accounts for 1 per mill of the mass of the second mixture; the mass fraction of the primary coal water slurry is 18-20%, and the average particle size is 450 nm.
Further, adding raw coal and primary coal water slurry into a ball mill according to the proportion of 3: 1; the mass of the additive accounts for 3 per mill of the mass of the raw coal added into the ball mill.
And further, the finished coal water slurry is the coal water slurry with the 400-mesh passing rate of 80% and the mass fraction of 78% -80%.
Further, the coal water slurry concentration method also comprises the following steps: the mixture which was not filtered through the second centrifugal filter was re-introduced into the ball mill for secondary grinding.
Further, the coal water slurry concentration method also comprises the following steps: and sending the finished coal water slurry output by the second centrifugal filter into a finished product tank for storage.
According to another aspect of the present invention, there is provided a coal water slurry concentration apparatus using the above coal water slurry concentration method, the coal water slurry concentration apparatus comprising a first wet grinder, a first centrifugal filter, an ultra-fine wet grinder, a ball mill and a second centrifugal filter connected in sequence;
a first wet grinder carries out wet grinding processing treatment on raw coal and industrial water to prepare a first mixture; homogenizing and filtering the first mixture by a first centrifugal filter to prepare a second mixture; the superfine wet grinder grinds the second mixture, the industrial water and the grinding aid to prepare primary coal water slurry; the grinding particle size of the superfine wet grinder is smaller than that of the first wet grinder; the ball mill processes the primary coal water slurry, raw coal and additive to prepare secondary coal water slurry; and the second centrifugal filter is used for filtering the second-stage coal water slurry to obtain a finished product coal water slurry.
Further, the coal water slurry concentration device also comprises a finished product tank; the finished product tank is connected with the second centrifugal filter; the finished product tank stores the finished product coal water slurry output by the second centrifugal filter;
the first centrifugal filter comprises a first return pipe, and the first return pipe is connected with the first wet grinder; the first return pipe conveys the mixture which is not filtered by the first centrifugal filter back to the first wet grinder for secondary wet grinding processing;
the second centrifugal filter comprises a second return pipe, and the second return pipe is connected with the ball mill; and the second return pipe conveys the mixture which is not filtered by the second centrifugal filter back to the ball mill for secondary grinding.
By applying the technical scheme of the invention, the invention provides a coal water slurry concentration method, which comprises the following steps: adding raw coal and industrial water into a first wet grinder for wet grinding processing treatment to prepare a first mixture; conveying the first mixture into a first centrifugal filter, and homogenizing and filtering the first mixture by the first centrifugal filter to prepare a second mixture; adding the second mixture, industrial water and a grinding aid into an ultrafine wet grinder together for grinding processing treatment to prepare primary coal water slurry, wherein the grinding particle size of the ultrafine wet grinder is smaller than that of the first wet grinder; adding the primary coal water slurry, the raw coal and the additive into a ball mill together for processing to prepare secondary coal water slurry; and conveying the second-stage coal water slurry into a second centrifugal filter for filtering treatment to obtain the finished coal water slurry. Compared with the prior art, the method uses the primary coal water slurry to replace the industrial water to be added in the step, uses the primary coal water slurry to replace the water to be slurried in the ball mill, and enables the additive to be better adsorbed on the surfaces of coal particles; compared with industrial water, the primary water-coal-slurry added into the ball mill is slurry with certain viscosity, and the slurry adheres coal to steel balls of the ball mill, so that the grinding time is prolonged, and the grinding efficiency and the processing capacity of the ball mill are improved. Therefore, the finished coal water slurry prepared by the method has excellent stability and fluidity, the concentration of the coal water slurry is improved by 18-20%, the apparent viscosity is low, and the activity and specific surface energy of carbon particles are qualitatively overflowed; when the finished coal water slurry is combusted, the combustion heat efficiency is high, the coal saving advantage is obvious, the pollutant emission can be effectively reduced on the basis of high-efficiency clean combustion, and the environment is protected.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a flow chart of a coal-water slurry concentration method provided by an embodiment of the invention;
fig. 2 shows a schematic structural diagram of a coal-water slurry concentration device provided by an embodiment of the invention.
Wherein the figures include the following reference numerals:
1. a first wet mill; 2. a first centrifugal filter; 3. ultra-fine wet mill; 4. a ball mill; 5. a second centrifugal filter; 6. and (5) a finished product can.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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.
As shown in fig. 1, an embodiment of the present invention provides a method for concentrating coal-water slurry, including the following steps:
adding raw coal and industrial water into a first wet grinder 1 for wet grinding processing treatment to prepare a first mixture;
conveying the first mixture into a first centrifugal filter 2, and homogenizing and filtering the first mixture by the first centrifugal filter 2 to prepare a second mixture;
adding the second mixture, industrial water and a grinding aid into an ultrafine wet grinder 3 together for grinding processing treatment to prepare primary coal water slurry, wherein the grinding particle size of the ultrafine wet grinder 3 is smaller than that of the first wet grinder 1;
adding the primary coal water slurry, the raw coal and the additive into a ball mill 4 together for processing treatment to prepare secondary coal water slurry;
and conveying the second-stage coal water slurry into a second centrifugal filter 5 for filtering treatment to obtain the finished coal water slurry.
The finished coal water slurry prepared by the method has excellent stability and fluidity, the concentration of the coal water slurry is improved by 18 to 20 percent, the apparent viscosity is low, and the activity and specific surface energy of carbon particles are qualitatively overflowed; when the finished coal water slurry is combusted, the combustion heat efficiency is high, the coal saving advantage is obvious, the emission of pollutants can be effectively reduced on the basis of high-efficiency clean combustion, and the environment is protected.
It is worth mentioning that: compared with the prior art, the method has the advantages that the primary coal water slurry is used for replacing industrial water to be added in the step, the primary coal water slurry is used for replacing water to be added in the step to prepare slurry in the ball mill 4, so that the additive is better adsorbed on the surfaces of coal particles, the additive is added according to the proportion of the raw coal, the additive is lower in dosage, and the utilization rate of the additive is high; compared with industrial water, the primary water-coal-slurry added into the ball mill 4 is slurry with certain viscosity, and the slurry adheres coal to steel balls of the ball mill 4, so that the grinding time is prolonged, and further, the grinding efficiency and the processing capacity of the ball mill 4 are improved.
Specifically, the coal water slurry concentration method further comprises the following steps: the mixture which has not been filtered by the first centrifugal filter 2 is re-input to the first wet grinder 1 for the second wet grinding process. The arrangement ensures that the waste phenomenon of raw materials does not occur in the concentration processing process of the coal water slurry.
The first wet grinder 1 is a vertical wet grinder; adding raw coal and industrial water into a first wet grinder 1 according to the mass ratio of 1: 1; the second mixture is a coal-water mixture with a 100-mesh passing rate of 85% and a mass fraction of 45% -50%. The arrangement ensures that the second mixture is more suitable for subsequent superfine wet grinding machine 3 to carry out grinding processing, and improves the grinding efficiency of the superfine wet grinding machine 3.
Adding the second mixture and industrial water into an ultrafine wet grinder 3 according to the mass ratio of 1: 1.5; the mass of the grinding aid accounts for 1 per mill of the mass of the second mixture; the mass fraction of the primary coal water slurry is 18-20%, and the average particle size is 450 nm. This arrangement ensures the grinding quality of the ultra-fine wet grinder 3.
Adding raw coal and primary coal water slurry into a ball mill 4 according to the mass ratio of 3: 1; the mass of the additive accounts for 3 per mill of the mass of the raw coal added into the ball mill 4. The arrangement ensures the grinding quality of the ball mill 4. In the embodiment, the dosage of the additive is added according to the proportion of the raw coal, the dosage of the additive is lower, and the utilization rate of the additive is high.
The finished coal water slurry is the coal water slurry with the 400-mesh passing rate of 80 percent and the mass fraction of 78 to 80 percent. The concentration of the finished coal water slurry is improved by 18-20% compared with the concentration of the traditional coal water slurry, the apparent viscosity is low, the activity and specific surface energy of carbon particles are qualitatively overflowed, and the high combustion thermal efficiency and the environmental protection are ensured when the finished coal water slurry is combusted.
Slurry viscosity of finished coal water slurry<1000 mPa.s (20 ℃, 100RPM), and the stability is more than or equal to 40d, namely the finished product of the coal water slurry does not precipitate within 40 days; flow class a. The finished coal water slurry has small carbon particle size, high surface activity, easy ignition, over 98 percent burnout rate,the coal water slurry can be fully combusted at 800-900 ℃, and compared with the condition that the traditional coal water slurry can be fully combusted at the temperature of over 1000 ℃, the coal water slurry finished product has lower temperature for full combustion, thereby greatly reducing SO 2 、NO X And the cost of soot emission and removal.
Specifically, the coal water slurry concentration method further comprises the following steps: the mixture which has not been filtered through the second centrifugal filter 5 is re-introduced into the ball mill 4 for secondary grinding. The arrangement ensures that the waste phenomenon of raw materials does not occur in the concentration processing process of the coal water slurry.
The coal water slurry concentration method also comprises the following steps: and sending the finished coal water slurry output by the second centrifugal filter 5 into a finished product tank 6 for storage. The finished product tank 6 ensures good storage conditions of the finished product coal water slurry, so that the finished product coal water slurry is not easy to deteriorate or be polluted by impurities.
As shown in fig. 2, the present invention further provides a coal water slurry concentration device, wherein the coal water slurry concentration device uses the coal water slurry concentration method, and comprises a first wet grinder 1, a first centrifugal filter 2, an ultra-fine wet grinder 3, a ball grinder 4 and a second centrifugal filter 5 which are connected in sequence;
a first wet grinder 1 carries out wet grinding processing treatment on raw coal and industrial water to prepare a first mixture; the first centrifugal filter 2 homogenizes and filters the first mixture to prepare a second mixture; the superfine wet grinder 3 grinds the second mixture, the industrial water and the grinding aid to prepare primary coal water slurry; the grinding particle size of the superfine wet grinder 3 is smaller than that of the first wet grinder 1; the ball mill 4 processes the primary coal water slurry, the raw coal and the additive to prepare secondary coal water slurry; and the second centrifugal filter 5 filters the second-stage coal water slurry to obtain a finished product coal water slurry.
The finished product of the coal water slurry prepared by the coal water slurry concentration device has excellent stability and fluidity, the concentration of the coal water slurry is improved by 18 to 20 percent, the apparent viscosity is low, and the activity and specific surface energy of carbon particles are qualitatively overflowed; when the finished coal water slurry is combusted, the combustion heat efficiency is high, the coal saving advantage is obvious, the emission of pollutants can be effectively reduced on the basis of high-efficiency clean combustion, and the environment is protected.
The coal water slurry concentration device also comprises a finished product tank 6; the finished product tank 6 is connected with the second centrifugal filter 5; the finished product tank 6 stores the finished coal water slurry output by the second centrifugal filter 5; the first centrifugal filter 2 comprises a first return pipe which is connected with the first wet grinder 1; the first return pipe conveys the mixture which is not filtered by the first centrifugal filter 2 back to the first wet grinder 1 for secondary wet grinding processing; the second centrifugal filter 5 comprises a second return pipe which is connected with the ball mill 4; the second return pipe conveys the mixture, which has not been filtered by the second centrifugal filter 5, back into the ball mill 4 for secondary grinding. By the arrangement, the first return pipe and the second return pipe ensure the full utilization of materials in the grinding process; the finished product tank 6 ensures good storage conditions of the finished product coal water slurry, so that the finished product coal water slurry is not easy to deteriorate or be polluted by impurities.
In conclusion, the invention provides a coal water slurry concentration method and a coal water slurry concentration device, and the finished coal water slurry prepared by the method has high concentration, excellent stability and fluidity, high combustion heat efficiency during combustion and obvious coal saving advantage.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …", "above … …", "above … …, on a surface", "above", and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for concentrating coal water slurry is characterized by comprising the following steps:
adding raw coal and industrial water into a first wet grinder (1) for wet grinding processing treatment to prepare a first mixture;
conveying the first mixture into a first centrifugal filter (2), wherein the first centrifugal filter (2) homogenizes and filters the first mixture to prepare a second mixture;
adding the second mixture, industrial water and grinding aid into an ultra-fine wet grinder (3) together for grinding processing treatment to prepare primary coal water slurry, wherein the grinding particle size of the ultra-fine wet grinder (3) is smaller than that of the first wet grinder (1);
adding the primary coal water slurry, the raw coal and the additive into a ball mill (4) together for processing treatment to prepare secondary coal water slurry;
and conveying the second-stage coal water slurry into a second centrifugal filter (5) for filtering treatment to obtain the finished product coal water slurry.
2. The method of claim 1, further comprising the steps of: re-feeding the mixture not filtered through the first centrifugal filter (2) to the first wet mill (1) for a second wet milling process.
3. The coal-water slurry concentration method according to claim 1, characterized in that the first wet mill (1) is a vertical wet mill; adding raw coal and industrial water into the first wet grinder (1) according to the ratio of 1: 1; the second mixture is a coal-water mixture with a 100-mesh passing rate of 85% and a mass fraction of 45% -50%.
4. The coal water slurry concentration method according to claim 1, wherein the second mixture and industrial water are added into the ultra-fine wet mill (3) according to the ratio of 1: 1.5; the mass of the grinding aid accounts for 1 per mill of the mass of the second mixture; the mass fraction of the primary coal water slurry is 18-20%, and the average particle size is 450 nm.
5. The coal-water slurry concentration method according to claim 1, characterized in that raw coal and the primary coal-water slurry are added into the ball mill (4) according to the ratio of 3: 1; the mass of the additive accounts for 3 per mill of the mass of the raw coal added into the ball mill (4).
6. The coal water slurry concentration method according to claim 1, wherein the finished coal water slurry is the coal water slurry with the 400-mesh passing rate of 80% and the mass fraction of 78% -80%.
7. The coal-water slurry concentration method according to claim 1, further comprising the steps of: the mixture which has not been filtered through the second centrifugal filter (5) is reintroduced into the ball mill (4) for secondary grinding.
8. The coal-water slurry concentration method according to claim 1, further comprising the steps of: and sending the finished coal water slurry output by the second centrifugal filter (5) into a finished product tank (6) for storage.
9. A coal water slurry concentration device, characterized in that the coal water slurry concentration device uses the coal water slurry concentration method of any one of claims 1 to 8, and the coal water slurry concentration device comprises a first wet grinder (1), a first centrifugal filter (2), an ultra-fine wet grinder (3), a ball grinder (4) and a second centrifugal filter (5) which are connected in sequence;
the first wet grinder (1) carries out wet grinding processing treatment on raw coal and industrial water to prepare a first mixture; the first centrifugal filter (2) is used for homogenizing and filtering the first mixture to prepare a second mixture; the superfine wet grinder (3) grinds the second mixture, the industrial water and the grinding aid to prepare the primary coal water slurry; the grinding particle size of the superfine wet grinder (3) is smaller than that of the first wet grinder (1); the ball mill (4) processes the primary coal water slurry, the raw coal and the additive to prepare the secondary coal water slurry; and the second centrifugal filter (5) filters the second-stage coal water slurry to obtain a finished product coal water slurry.
10. The coal-water slurry concentration apparatus according to claim 9, further comprising a finished product tank (6); the finished product tank (6) is connected with the second centrifugal filter (5); the finished product tank (6) stores the finished product coal water slurry output by the second centrifugal filter (5);
the first centrifugal filter (2) comprises a first return pipe which is connected with the first wet grinder (1); the first return pipe conveys the mixture which is not filtered by the first centrifugal filter (2) back to the first wet grinder (1) for secondary wet grinding processing;
the second centrifugal filter (5) comprises a second return pipe which is connected with the ball mill (4); the second return pipe conveys the mixture which is not filtered by the second centrifugal filter (5) back into the ball mill (4) for secondary grinding.
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