Ultrahigh-concentration coal water slurry preparation process and equipment based on front-end coal blending

Abstract

The invention discloses an ultrahigh-concentration coal water slurry preparation process and equipment based on front-end coal blending, and relates to the technical field of new coal water slurry preparation. The ultrahigh-concentration coal water slurry preparation process comprises the following steps: S1, taking a proper amount of coal A, feeding a coal sample A into a second rod mill for crushing and slurrying, and feeding prepared slurry A into a fine grinding machine through a fine grinding hopper for ultrafine grinding; according to the method, the two technologies are ingeniously fused, the advantages of coal blending in the aspect of improving the coal quality are exerted, the advantages of grain size distribution in the aspect of improving the physical properties of the coal slurry are utilized, and the single method that concentration is carried out only through coal blending or only through grain size distribution in the prior art is abandoned; the coal water slurry is concentrated by optimizing the combination mode of coal blending and grain size distribution, and the effects of enhancing advantages and avoiding disadvantages and complementing gains are achieved.

Description

Technical Field

[0001] The present invention relates to a new technical field of coal water slurry preparation, specifically to a preparation process and equipment for ultra-high concentration coal water slurry based on front-end coal blending. Background Technique

[0002] Coal water slurry is a liquid fuel made by physically processing coal, water and a small amount of additives. It combines the dual advantages of coal and petroleum and is regarded as a clean and efficient energy utilization method. With the growth of global energy demand and the enhancement of environmental protection awareness, coal water slurry, as an alternative energy source, has gradually received wide attention. The preparation process of coal water slurry usually includes links such as coal crushing, grinding, screening and the addition of additives, aiming to obtain a slurry with uniform particle size and good stability. This fuel is not only easy to store and transport, but also has high combustion efficiency and low pollutant emissions, and is especially suitable for fields such as power station boilers, industrial kilns and ship power. In recent years, with the continuous progress of technology and the promotion of environmental protection policies, the application scope of coal water slurry has been continuously expanded, and its market potential is huge. At the same time, in order to improve the concentration and combustion performance of coal water slurry, scientific research personnel have continuously explored new preparation processes and additives to promote the continuous innovation and development of coal water slurry technology. In short, coal water slurry, as a clean and efficient energy utilization method, has broad development prospects.

[0003] The concentration of coal water slurry is one of the key indicators to measure its quality and gasification / combustion efficiency, which is directly related to the economy and environmental protection of energy utilization. The concentration usually refers to the content of solid coal particles in coal water slurry. High concentration means higher energy density and combustion efficiency, but at the same time, it also puts higher requirements on the preparation process. At present, the means of concentrating coal water slurry in industry focus on concentrating through particle size grading. However, particle size grading has limited improvement in the concentration of coal water slurry and is not sufficient to meet the economic requirements of enterprises. Therefore, there is an urgent need to invent a preparation method and its supporting equipment for ultra-high concentration coal water slurry.

[0004] Therefore, a preparation process and equipment for ultra-high concentration coal water slurry based on front-end coal blending are proposed to solve the above problems. Summary of the Invention

[0005] In view of this, the technical problem to be solved by the present invention is to propose a preparation process and equipment for ultra-high concentration coal water slurry based on front-end coal blending, and a solution to improve the concentration of coal water slurry by optimizing the combination of coal blending and particle size grading.

[0006] To achieve the above object, the present invention provides the following technical solution: A preparation process for ultra-high concentration coal water slurry based on front-end coal blending, characterized by including

[0007] S1, Pretreatment and Pulping of Coal A: Take an appropriate amount of Coal A raw material, feed the Coal A raw material into the second rod mill for wet coarse grinding, crush it to the target particle size to generate a primary slurry, transfer the primary slurry to a fine grinding machine through a fine grinding hopper for ultra-fine grinding to form a highly dispersive A slurry;

[0008] S2, Ultra-fine Slurry Circulating Feeding: The A slurry after fine grinding is spirally conveyed to the feeding port of the first rod mill through the double-sided feeder, and the feeding rate is dynamically adjusted by the PID algorithm to ensure the fluidity of the slurry;

[0009] S3, Crushing and Dynamic Coal Blending of Coal B: Take an appropriate amount of Coal B raw material, feed the Coal B raw material into the first rod mill for wet crushing, and simultaneously inject the A slurry conveyed in step S2, and realize the dynamic mixing of Coal A and Coal B through the internal stirring of the first rod mill;

[0010] S4, Preparation and Storage of Mixed Slurry: The mixed slurry after coal blending is discharged into the mixed slurry tank through a hopper, and an ultra-high concentration coal water slurry is obtained through stirring and standing treatment.

[0011] A preparation process of ultra-high concentration coal water slurry based on front-end coal blending, the discharge port of the second rod mill corresponds to the feeding port of the fine grinding hopper, the fine grinding hopper is installed above the middle of the fine grinding machine, and the feeders symmetrically installed on both sides of the fine grinding machine are connected to the first rod mill.

[0012] A preparation process of ultra-high concentration coal water slurry based on front-end coal blending, water and additives are sprayed during the coal blending in the first rod mill and the crushing and pulping in the second rod mill, and the additives are lignosulfonate, humate or naphthalene sulfonic acid formaldehyde condensate.

[0013] A preparation equipment of ultra-high concentration coal water slurry based on front-end coal blending, including a first rod mill, feeders are installed on both sides of the first rod mill, and the feeders are fixedly connected to a fine grinding machine at both ends far away from the first rod mill, a fine grinding hopper is installed above the middle of the fine grinding machine, and a second rod mill is arranged above the fine grinding hopper, characterized in that it further includes a filtering mechanism and an anti-blocking mechanism;

[0014] The first rod mill includes a rod grinding drum and a hopper, the filtering mechanism is evenly arranged in the rod grinding drum, and the filtering mechanism is used for filtering, anti-blocking and scraping of coal;

[0015] The anti-blocking mechanism is arranged in the hopper, and the anti-blocking mechanism is used for the auxiliary feeding of coal samples.

[0016] Preferably, the first rod mill further includes a frame, a driving motor is installed on the frame, a transmission belt is drivingly connected to the driving motor, one end of the transmission belt far away from the driving motor is drivingly connected to the rod grinding drum, and the hopper is arranged in the middle of the outer surface of the rod grinding drum.

[0017] Preferably, the filtering mechanism includes an auxiliary abrasive block. A rotating shaft is rotatably connected to the bottom of the auxiliary abrasive block. Powder sieve hoppers are uniformly and fixedly connected to the outer surface of the middle part of the rod mill drum. The outer surface of the rotating shaft is slidably connected to the middle part of the powder sieve hopper. A first stirring blade is arranged on the upper surface of the middle part of the powder sieve hopper. The middle part of the first stirring blade is slidably connected to the outer surface of the rotating shaft. A second stirring blade is arranged on the lower surface of the powder sieve hopper. The middle part of the second stirring blade is slidably connected to the outer surface of the rotating shaft.

[0018] Preferably, a tension spring is rotatably connected to the side of the middle part of the second stirring blade away from the powder sieve hopper. One end of the tension spring away from the powder sieve hopper is rotatably connected to a support block. A push plate is rotatably connected to the outer circumference of the side of the support block close to the tension spring. One end of the push plate away from the support block is rotatably connected to a pressing block. Arc-shaped pressing grooves are uniformly formed on the second stirring blade. The outer surface of the pressing block is slidably connected in the arc-shaped pressing grooves.

[0019] Preferably, the anti-blocking mechanism includes a swinging block. One end of the swinging block is rotatably connected to the pressing block. The other end of the swinging block is rotatably connected to a vibration hammer. A triangular frame is rotatably connected to the middle part of the vibration hammer. The side of the triangular frame away from the vibration hammer is fixedly connected to the outer surface of the powder sieve hopper. A return spring is fixedly connected to the side of the vibration hammer close to the triangular frame. One end of the return spring away from the vibration hammer is fixedly connected to the triangular frame.

[0020] Preferably, scraping plates are uniformly and fixedly connected to the outer surface of the middle part of the rod mill drum. Grinding blocks are uniformly installed on the inner surface of the rod mill drum. Both sides of the auxiliary abrasive block are slidably connected to the middle parts of the grinding blocks.

[0021] Compared with the prior art, the present invention provides a preparation process and equipment for ultra-high-concentration water coal slurry based on front-end coal blending, and has the following beneficial effects:

[0022] 1. Although the particle size distribution has a relatively limited overall effect on improving the slurry concentration of water coal slurry, it shows unique advantages in adjusting the fluidity and stability of the coal slurry. By ingeniously integrating these two technologies, the present invention not only gives full play to the advantages of coal blending in improving coal quality, but also utilizes the advantages of particle size distribution in improving the physical properties of the coal slurry, abandoning the previous single method of only relying on coal blending for concentration or only relying on particle size distribution for concentration. By optimizing the combination of coal blending and particle size distribution to concentrate the water coal slurry, the effects of making the best use of advantages and compensating for deficiencies are achieved.

[0023] 2. When the iron rod grinds and extrudes in the rod mill drum, it extrudes the auxiliary abrasive block. The mutual extrusion between the arc-shaped extrusion groove and the extrusion block drives the rotation of the rotating shaft. The rotation of the rotating shaft drives the synchronous rotation of the first stirring blade and the second stirring blade at the same time. When the first stirring blade and the second stirring blade rotate, it can prevent the powder sieve hopper from being blocked during the grinding and filtering of the coal sample. Compared with the prior art where a filter screen is directly used for filtering, which is prone to blockage of the filter screen, in this solution, when the iron rod grinds in the rod mill drum, the first stirring blade and the second stirring blade scrape the surface of the filter holes of the powder sieve hopper through the mechanical linkage effect, thereby reducing the accumulation and blockage of the coal slurry on the surface of the filter holes of the powder sieve hopper. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a process flow chart of a super-high-concentration coal water slurry preparation process based on front-end coal blending according to the present invention;

[0025] Figure 2 is a schematic three-dimensional structure diagram of the present invention;

[0026] Figure 3 is a schematic auxiliary three-dimensional structure diagram of the present invention;

[0027] Figure 4 is a schematic diagram of the structural connection relationship of the filtering mechanism of the present invention;

[0028] Figure 5 is the present invention Figure 4 enlarged view at A in;

[0029] Figure 6 is a schematic diagram of the structural connection relationship of the anti-blocking mechanism of the present invention;

[0030] Figure 7 is a schematic auxiliary diagram of the structural connection relationship of the filtering mechanism of the present invention;

[0031] Figure 8 is the present invention Figure 7 enlarged view at B in.

[0032] In the figure:

[0033] 1. First rod mill; 2. Second rod mill; 3. Fine grinding hopper; 4. Fine grinder;

[0034] 11. Frame; 12. Driving motor; 13. Transmission belt; 14. Rod mill drum; 15. Feeding hopper;

[0035] 20. Filtering mechanism; 21. Auxiliary abrasive block; 22. Powder sieve hopper; 23. Rotating shaft; 24. First stirring blade; 25. Second stirring blade; 26. Tensile spring; 27. Support block; 28. Push plate; 29. Arc-shaped extrusion groove; 2901. Extrusion block;

[0036] 30. Anti-clogging mechanism; 31. Swing block; 32. Vibration hammer; 33. Tripod; 34. Return spring; 35. Scraper; 36. Grinding block. Detailed implementation mode

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0039] First embodiment

[0040] Please refer to Figures 1 to 8 as shown:

[0041] To solve the problems mentioned in the technical solution, the embodiment of the present application provides a preparation device for ultra-high-concentration water-coal slurry based on front-end coal blending, including a first rod mill 1. Feeding devices are installed on both sides of the first rod mill 1, and fine grinding machines 4 are fixedly connected and communicated at both ends of the feeding devices away from the first rod mill 1. A fine grinding hopper 3 is installed above the middle of the fine grinding machine 4, and a second rod mill 2 is arranged above the fine grinding hopper 3. It is characterized in that it further includes a filtering mechanism 20 and an anti-clogging mechanism 30;

[0042] The first rod mill 1 includes a rod grinding drum 14 and a feeding hopper 15. The filtering mechanism 20 is evenly arranged in the rod grinding drum 14, and the filtering mechanism 20 is used for filtering, anti-clogging and scraping of coal;

[0043] The anti-clogging mechanism 30 is arranged in the feeding hopper 15, and the anti-clogging mechanism 30 is used for auxiliary feeding of coal samples;

[0044] The first rod mill 1 further includes a frame 11. A driving motor 12 is installed on the frame 11. A transmission belt 13 is connected to the driving motor 12 in a transmission manner. One end of the transmission belt 13 away from the driving motor 12 is connected to the rod grinding drum 14 in a transmission manner. The feeding hopper 15 is arranged in the middle of the outer surface of the rod grinding drum 14;

[0045] Specifically, as Figure 8 shown, the bottom of the auxiliary abrasive block 21 is rotatably connected to a rotating shaft 23. The middle outer surface of the rod grinding drum 14 is evenly and fixedly connected with powder sieve hoppers 22. The outer surface of the rotating shaft 23 is slidably connected to the middle of the powder sieve hoppers 22. The upper surface of the middle of the powder sieve hoppers 22 is provided with a first stirring blade 24. The middle of the first stirring blade 24 is slidably connected to the outer surface of the rotating shaft 23. The lower surface of the powder sieve hoppers 22 is provided with a second stirring blade 25. The middle of the second stirring blade 25 is slidably connected to the outer surface of the rotating shaft 23;

[0046] Among them, the auxiliary abrasive block 21 is elastically higher than the grinding block 36 through the stretching spring 26. A limiting block is arranged on the outer surface of the rotating shaft 23. The first stirring blade 24 and the second stirring blade 25 can only be slidably connected to the rotating shaft 23 through the action of the limiting block.

[0047] A stretching spring 26 is rotatably connected to one side of the middle part of the second stirring blade 25 away from the powder sieve hopper 22. One end of the stretching spring 26 away from the powder sieve hopper 22 is rotatably connected to a support block 27. A push plate 28 is rotatably connected to the outer circumference of one side of the support block 27 close to the stretching spring 26. One end of the push plate 28 away from the support block 27 is rotatably connected to an extrusion block 2901. Arc-shaped extrusion grooves 29 are evenly formed on the second stirring blade 25. The outer surface of the extrusion block 2901 is slidably connected in the arc-shaped extrusion grooves 29;

[0048] In this solution, when the iron rod is ground and extruded in the rod mill drum 14, the auxiliary abrasive block 21 is extruded. The rotation of the rotating shaft 23 is driven by the mutual extrusion of the arc-shaped extrusion groove 29 and the extrusion block 2901. The first stirring blade 24 and the second stirring blade 25 are driven to rotate synchronously by the rotation of the rotating shaft 23. When the first stirring blade 24 and the second stirring blade 25 rotate, the coal sample can be prevented from blocking the powder sieve hopper 22 during grinding and filtering. Compared with the prior art in which a filter screen is directly used for filtering and is prone to blockage of the filter screen, in this solution, while the iron rod is grinding in the rod mill drum 14, the first stirring blade 24 and the second stirring blade 25 are used to scrape the surface of the filter holes of the powder sieve hopper 22 through the mechanical linkage effect, so as to reduce the accumulation and blockage of the coal material on the surface of the filter holes of the powder sieve hopper 22.

[0049] Specifically, as Figure 5 and Figure 6 shown, one end of the swing block 31 is rotatably connected to the extrusion block 2901. The other end of the swing block 31 is rotatably connected to a vibration hammer 32. The middle part of the vibration hammer 32 is rotatably connected to a tripod 33. One side of the tripod 33 away from the vibration hammer 32 is fixedly connected to the outer surface of the powder sieve hopper 22. A return spring 34 is fixedly connected to one side of the vibration hammer 32 close to the tripod 33. One end of the return spring 34 away from the vibration hammer 32 is fixedly connected to the tripod 33; Scrapers 35 are evenly fixedly connected to the outer surface of the middle part of the rod mill drum 14. Grinding blocks 36 are evenly installed on the inner surface of the rod mill drum 14. Both sides of the auxiliary abrasive block 21 are slidably connected to the middle part of the grinding blocks 36;

[0050] In this solution, the filtering mechanism 20 scrapes the surface of the filter holes, and at the same time, the anti-clogging mechanism 30 can be synchronously linked to strike the outside of the powder sieve hopper 22. Through periodic knocking, the particulate matter or impurities attached to the surface of the filter screen can be removed in time to ensure stable filtering efficiency. At the same time, in this solution, a reset spring 34 is evenly arranged on the outer surface of the middle part of the rod mill drum 14. Through the reset spring 34, the filtered slurry can be quickly pushed out, so as to reduce the accumulation and blockage in the downstream hopper 15 after filtration.

[0051] Second Embodiment

[0052] S1, Pretreatment and Pulp Preparation of Coal A: Take an appropriate amount of coal A raw material, send the coal A raw material into the second rod mill 2 for wet coarse grinding treatment, crush it to the target particle size to generate a primary slurry, and transfer the primary slurry to the fine grinder 4 through the fine grinding hopper 3 for ultra-fine grinding treatment to form a highly dispersible A slurry;

[0053] S2, Ultra-fine Slurry Circulation Feeding: The finely ground A slurry is transported to the feeding port of the first rod mill 1 through the double-sided feeder, and the feeding rate is dynamically adjusted by the PID algorithm to ensure the fluidity of the slurry;

[0054] S3, Crushing and Dynamic Coal Blending of Coal B: Take an appropriate amount of coal B raw material, send the coal B raw material into the first rod mill 1 for wet crushing, and simultaneously inject the A slurry transported in step S2. Through the internal stirring of the first rod mill 1, the dynamic mixing of coal A and coal B is realized;

[0055] S4, Preparation and Storage of Mixed Slurry: The coal-blended mixed slurry is discharged into the mixed slurry tank through the discharge hopper 15, and through stirring and static treatment, an ultra-high-concentration coal water slurry is obtained.

[0056] Among them, the second rod mill 2 and the ultra-fine grinder use a drive pump of model 250ZX500-32, and the drive of the first rod mill 1 uses a model of 300ZX500-50.

[0057] Water and additives are sprayed during coal blending in the first rod mill 1 and during crushing and pulp preparation in the second rod mill 2, and the additives are lignosulfonate, humate or naphthalene sulfonic acid formaldehyde condensate.

[0058] The above embodiments are specifically implemented as follows:

[0059] The raw coal used in this implementation is Huainan coal and Shanxi coal. Among them, the received-base moisture content of Huainan coal is 6.77%, the air-dried-base ash content is 28.69%, and the air-dried-base volatile content is 26.38%; the received-base moisture content of Shanxi coal is 8.72%, the air-dried-base ash content is 10.53%, and the air-dried-base volatile content is 26.44%.

[0060] Feed Huainan coal into the second rod mill 2 to crush the Huainan coal into pulverized coal smaller than 2.5 mm. Prepare the Huainan coal for pulping. Subsequently, feed the Huainan coal slurry into an ultrafine grinder for ultrafine grinding. Feed Shanxi coal into the first rod mill 1 for crushing. While feeding the Shanxi coal into the first rod mill 1, feed the Huainan coal slurry into the first rod mill 1 at the same time, and control the ratio of Huainan coal to Shanxi coal to be 2:8 (by mass).

[0061] 3. Feed the mixed slurry into the mixed slurry tank for standby.

[0062] 4. The water coal slurry prepared by the present invention can be used in the fields of fuel and gasification water coal slurry.

[0063] solution maximum concentration / % actual concentration / % apparent viscosity / mPa·s fluidity 3% ultrafine 67 67.23 493.7 B+ 5% ultrafine 68 68.29 544.7 B 10% ultrafine 69 69.47 785.8 B 15% ultrafine 70 70.36 864.7 B 20% ultrafine 71 71.31 1017.8 B

[0064] Data analysis: At present, the concentration of the water coal slurry used by coal gasification enterprises is usually about 60%. The ultra-high concentration water coal slurry prepared by the present invention can increase the concentration of the water coal slurry to more than 70%, greatly improving the gasification efficiency.

[0065] In view of the fact that the coal blending technology has strict requirements on coal quality and can significantly improve the coal quality characteristics, while the particle size distribution has a relatively limited overall effect on the slurry concentration of the water coal slurry, but shows unique advantages in regulating the fluidity and stability of the coal slurry. By skillfully integrating these two technologies, the present invention not only gives play to the advantages of coal blending in improving coal quality, but also utilizes the advantages of particle size distribution in improving the physical properties of the coal slurry, achieving the effect of making the best use of advantages and compensating for deficiencies and mutual enhancement.

[0066] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0067] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A preparation process of ultra-high concentration coal water slurry based on front-end coal blending, characterized in that, Including S1, pretreatment and pulping of coal A: Take an appropriate amount of coal A raw material, feed the coal A raw material into the second rod mill (2) for wet coarse grinding, crush it to the target particle size to generate a primary slurry, and transfer the primary slurry to the fine grinder (4) through the fine grinding hopper (3) for ultra-fine grinding to form a highly dispersive A slurry; S2, ultra-fine slurry circulating feeding: The A slurry after fine grinding is transported to the feeding port of the first rod mill (1) through a double-sided feeder, and the feeding rate is dynamically adjusted by the PID algorithm to ensure the fluidity of the slurry; S3, crushing and dynamic coal blending of coal B: Take an appropriate amount of coal B raw material, feed the coal B raw material into the first rod mill (1) for wet crushing, and simultaneously inject the A slurry transported in step S2, and realize the dynamic mixing of coal A and coal B through the internal stirring of the first rod mill (1); S4, preparation and storage of the mixed slurry: The mixed slurry after coal blending is discharged into the mixed slurry tank through the discharge hopper (15), and an ultra-high-concentration coal water slurry is obtained through stirring and static settling treatment.

2. The preparation process of ultra-high-concentration water-coal slurry based on front-end coal blending according to claim 1, characterized in that: Water and additives are sprayed during coal blending in the first rod mill (1) and pulp making by crushing in the second rod mill (2). The additives are lignosulfonate, humate or naphthalene sulfonic acid formaldehyde condensate.

3. An ultra-high concentration coal water slurry preparation device based on front-end coal blending, applicable to the ultra-high concentration coal water slurry preparation process according to any one of claims 1-2, comprising a first rod mill (1). Feeders are installed on both sides of the first rod mill (1), and fine grinders (4) are fixedly connected to the ends of the feeders away from the first rod mill (1). A fine grinding hopper (3) is installed above the middle of the fine grinder (4). A second rod mill (2) is arranged above the fine grinding hopper (3), characterized in that, It also includes a filtering mechanism (20) and an anti-blocking mechanism (30); The first rod mill (1) includes a rod grinding drum (14) and a discharge hopper (15). The filtering mechanism (20) is evenly arranged in the rod grinding drum (14), and the filtering mechanism (20) is used for filtering, anti-blocking and scraping of coal; The anti-blocking mechanism (30) is arranged in the discharge hopper (15), and the anti-blocking mechanism (30) is used for auxiliary feeding of coal samples.

4. The ultra-high concentration coal water slurry preparation device based on front-end coal blending according to claim 3, characterized in that: The first rod mill (1) further includes a frame (11). A driving motor (12) is installed on the frame (11). A transmission belt (13) is connected to the driving motor (12) in a transmission manner. One end of the transmission belt (13) away from the driving motor (12) is connected to the rod grinding drum (14) in a transmission manner. The discharge hopper (15) is arranged in the middle of the outer surface of the rod grinding drum (14).

5. The preparation equipment for ultra-high-concentration water-coal slurry based on front-end coal blending according to claim 3, wherein: The filtering mechanism (20) includes an auxiliary abrasive block (21). The bottom of the auxiliary abrasive block (21) is rotatably connected to a rotating shaft (23). The middle outer surface of the rod grinding drum (14) is evenly fixedly connected with powder sieve hoppers (22). The outer surface of the rotating shaft (23) is slidably connected to the middle of the powder sieve hoppers (22). The upper surface of the middle of the powder sieve hoppers (22) is provided with a first stirring blade (24). The middle of the first stirring blade (24) is slidably connected to the outer surface of the rotating shaft (23). The lower surface of the powder sieve hoppers (22) is provided with a second stirring blade (25). The middle of the second stirring blade (25) is slidably connected to the outer surface of the rotating shaft (23).

6. The ultra-high concentration coal water slurry preparation device based on front-end coal blending according to claim 5, characterized in that: One side of the middle part of the second stirring blade (25) away from the powder sieve hopper (22) is rotatably connected with a tension spring (26). One end of the tension spring (26) away from the powder sieve hopper (22) is rotatably connected with a support block (27). The outer circumference of one side of the support block (27) close to the tension spring (26) is rotatably connected with a push plate (28). One end of the push plate (28) away from the support block (27) is rotatably connected with an extrusion block (2901). Arc-shaped extrusion grooves (29) are evenly formed on the second stirring blade (25). The outer surface of the extrusion block (2901) is slidably connected in the arc-shaped extrusion grooves (29).

7. The ultra-high concentration coal water slurry preparation device based on front-end coal blending according to claim 6, characterized in that: The anti-blocking mechanism (30) includes a swing block (31). One end of the swing block (31) is rotatably connected to the extrusion block (2901). The other end of the swing block (31) is rotatably connected with a vibration hammer (32). The middle part of the vibration hammer (32) is rotatably connected with a triangular frame (33). One side of the triangular frame (33) away from the vibration hammer (32) is fixedly connected to the outer surface of the powder sieve hopper (22). A return spring (34) is fixedly connected to one side of the vibration hammer (32) close to the triangular frame (33). One end of the return spring (34) away from the vibration hammer (32) is fixedly connected to the triangular frame (33).

8. The ultra-high concentration water coal slurry preparation device based on front-end coal blending according to claim 7, wherein: Scrapers (35) are evenly fixedly connected to the outer surface of the middle part of the rod mill drum (14). Grinding blocks (36) are evenly installed on the inner surface of the rod mill drum (14). Both sides of the auxiliary abrasive block (21) are slidably connected to the middle parts of the grinding blocks (36).

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