A fully automatic coarse particle coal slurry particle size grading preparation system and method

Abstract

The application discloses a kind of full-automatic coarse coal slurry particle size grading preparation systems, comprising: coarse coal particle size grading system, material bin and pulp preparation tank;Coarse coal particle size grading system, including rotary disc and fixed bottom plate;Rotary disc is disc structure, middle part is provided with driving device;Rotary disc is evenly provided with multiple through cavities around the periphery direction;The fixed bottom plate keeps fixed unmoved, and is provided with multiple through fixed apertures, and when rotary disc rotates, it can be overlapped with its cavity, and the screen mesh with screen mesh specification gradually increasing is built-in in different fixed apertures;The material bin is fixed below fixed aperture and is communicated with fixed aperture, and each material bin is provided with two layers of storage space inside, and lower storage space is communicated with pulp preparation tank;Also disclose corresponding preparation method;Let different particle size coal particles mix with set mass ratio, realize the accurate and rapid classification of coal particle size;From coal feeding, particle size grading to coal slurry preparation whole-process automation operation, reduce manual and improve the safety and reliability of production.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of coal slurry preparation, and more particularly relates to a full-automatic coarse-grained coal slurry particle size grading preparation system and method. BACKGROUND

[0002] In the field of coal resource utilization and transportation, coarse-grained coal slurry has a specific application scenario in the medium and short distance coal transportation. The traditional coal water slurry preparation technology for gasification and combustion is relatively mature, but coarse-grained coal slurry is different from it, and the particle size grading becomes a key technical difficulty in the preparation process.

[0003] In the existing coarse-grained coal slurry preparation process, the industry generally adopts the combination process of fine crusher crushing and vibrating screen to control the particle size. Although this traditional process can screen and process the particle size of the coal material to a certain extent, it has significant limitations. It can only control the upper limit of the particle size of the material, and it is difficult to optimize the particle size grading of the coarse-grained coal slurry. Due to the lack of effective particle size grading optimization means, the conveying concentration and rheological properties of the coarse-grained coal slurry in the conveying process cannot reach the ideal state, which directly affects the safety and economy of the coarse-grained coal slurry conveying.

[0004] Under the background of the current double-carbon economy, pipeline coal transportation, as a coal transportation method with important application value and broad development prospects, puts forward higher requirements for the quality and performance of coarse-grained coal slurry. Therefore, there is an urgent need for a new technology and new system that can effectively solve the problems of single function of existing coarse-grained coal slurry preparation process and equipment, difficulty in coal slurry particle size grading optimization, and complex equipment operation, etc., to promote the further development and wide application of pipeline coal transportation technology, and improve the utilization efficiency and economic benefit of coal resources in the medium and short distance transportation link. SUMMARY

[0005] The present application aims to provide a new full-automatic system and method for slurry preparation equipment and process, which solves the limitations of single function of existing coarse-grained coal slurry preparation process and equipment, difficulty in coal slurry particle size grading optimization, and complex equipment operation, etc. under the technical conditions, and helps the industry to move towards a more advanced and sustainable direction.

[0006] In view of the above defects or improvement needs of the prior art, according to the first aspect of the present application, a full-automatic coarse-grained coal slurry particle size grading preparation system is provided, which comprises: a coarse-grained coal particle size grading system, a material bin and a slurry preparation tank.

[0007] The coarse coal particle size grading system comprises a rotating disc and a fixed base plate; the rotating disc is a disc-shaped structure, and a driving device (the driving device comprises a spring disc rotating shaft and a variable speed motor) is arranged in the middle part to drive the rotating disc to rotate; a plurality of through cavities are uniformly arranged around the driving device in the circumferential direction; the rotating disc is rotatably arranged above the fixed base plate, and the radius of the rotating disc is smaller than that of the fixed base plate;

[0008] An installation plate is arranged at the outermost end of the fixed base plate, and a grating positioner and an infrared sensor are arranged above the installation plate, and the heights of the grating positioner and the infrared sensor are higher than the upper surface of the rotating disc; the fixed base plate is fixed and stationary, and a plurality of through fixed openings that can overlap with the cavities of the rotating disc when the rotating disc rotates are arranged, and the fixed openings are provided with screen meshes with gradually increasing specifications; a material bin is fixed below the fixed openings and is in communication with the fixed openings; each material bin is provided with upper and lower storage spaces, the bottom of the upper storage space is provided with a linkage switch for opening the bottom of the upper storage space, and the bin wall of the upper storage space is provided with an electromagnetic bin wall vibrator for driving the bin body to vibrate; the bottom of the lower storage space is provided with a quality sensing switch for opening the bottom of the lower storage space, and the lower storage space is in communication with a pulping tank after the quality sensing switch is opened.

[0009] The pulping tank is a hollow inner cavity tank body, and is provided with an internal stirrer, a quality sensor and an external water pipeline, and a discharge port is arranged at the bottom of the tank body.

[0010] Further, a dust cover is arranged at the upper part of the rotating disc, and a feeding port is arranged on one side of the dust cover and is matched with a feeding device.

[0011] Further, the screen mesh is a mesh structure with mesh holes, and the electromagnetic bin wall vibrator is opened to cause the material bin and the screen mesh to vibrate through the electromagnetic bin wall vibrator.

[0012] Further, the external water pipeline and the discharge port are both water pipeline structures provided with a switch valve; one end of the external water pipeline is connected with a water source, the other end penetrates the tank body of the pulping tank and extends into the inside of the tank body; and the upper end of the discharge port is in communication with the bottom end of the pulping tank.

[0013] Further, the installation plate comprises a first installation plate and a second installation plate arranged at the other end of the fixed base plate; the first installation plate and the second installation plate are respectively connected with the grating positioner and the infrared sensor;

[0014] The internal quality sensor is arranged at the bottom of the pulping tank, and the upper part receives the coal particles falling from the material bin.

[0015] Further, the internal stirrer comprises a stirring shaft, a stirring paddle and a driving motor, and is arranged above the bottom end of the pulping tank.

[0016] As another aspect of the present application, it also relates to a full-automatic coarse-grained coal slurry particle size grading preparation method, comprising the following steps:

[0017] S1 Set the coal slurry parameters through the control system and position the rotating disc using the grating positioner to determine its rotation direction and speed;

[0018] S2 Feed the coarse-grained coal material into the storage space formed by the rotating disc and the fixed bottom disc through the feeding device and move it along with the rotating disc;

[0019] S3 Trigger the electromagnetic bin wall vibrator to start when the infrared sensor senses the material to make the material bin drive the screen to vibrate;

[0020] S4 The screen aperture is designed to increase in size, and the material is pushed by the rotating disc and falls into the corresponding material bin through the screen according to the diameter size; the screen aperture is designed to increase in size in the clockwise direction, and when the material is pushed to the screen, the small-diameter material is preferentially slipped through the small-aperture screen to the corresponding material bin, and the large-diameter material is sequentially pushed by the rotating disc to slip into the subsequent material bin;

[0021] S5 The linkage switch and the mass inductive switch of the material bin control the material to fall into the slurry preparation tank according to the change of the mass of the bottom layer material; the specific working mode of the linkage switch and the mass inductive switch is that at the beginning, the linkage switch of each particle size grading material bin is opened and the mass inductive switch is closed, and the material falls from the upper layer of the material bin to the bottom layer of the material bin; when the mass of the bottom layer material reaches the set parameter, the linkage switch is closed and the mass inductive switch is opened.

[0022] S6 Calculate the amount of clean water in combination with the data of the built-in mass sensor in the slurry preparation tank and open the clean water pipeline to mix the different particle size coal particles dropped from the material bin after grading with clean water to prepare slurry, and then discharge it through the discharge port.

[0023] Further, the mass inductive switch of the material bin in step S5 opens the coal particles in the corresponding material bin to the slurry preparation tank according to the set mass ratio of different particle sizes of coal particles required for coarse-grained coal slurry preparation.

[0024] Further, the method for calculating the amount of clean water in step S6 is: first, determine the particle size distribution of coal and the mass proportion of each particle size, and the environmental temperature in the slurry preparation process. Specifically, this method calculates the required amount of clean water by comprehensively considering the influence of the particle size distribution, mass proportion and temperature of coal on the viscosity of coal slurry; the calculation formula is as follows:

[0025]

[0026] V water represents the required clean water volume, m coal represents the total mass of coal in the slurry preparation tank, C slurryρs represents the predetermined coal slurry concentration water ρs represents the predetermined coal slurry concentration

[0027] The function is defined as follows:

[0028]

[0029] wherein a, b, c and e are constants determined according to experimental data or empirical models, used to describe the influence of temperature and particle size distribution on the viscosity of coal slurry;

[0030] T is the ambient temperature, used to represent the influence of temperature on the viscosity of coal slurry, and a temperature sensor is provided in the system;

[0031] w i is the mass fraction of particles in the i-th particle size interval;

[0032] d i is the representative particle size value of the i-th particle size interval;

[0033] n is the total number of particle size intervals;

[0034] is a weighted sum, representing the comprehensive influence of particles of different sizes on the viscosity of coal slurry, wherein e is an index used to describe the degree of influence of particle size on the viscosity of coal slurry;

[0035] The constants a, b, c and e determined through experiments can make the function more accurately reflect the actual working conditions, thereby improving the accuracy of coal slurry preparation and the consistency of coal slurry quality.

[0036] Overall, compared with the prior art, the above technical solutions conceived by the present application can achieve the following beneficial effects:

[0037] 1. The full-automatic coarse particle coal slurry particle size grading preparation system of the present application adopts a particle size grading system including a rotating disc, a fixed bottom disc and a specific screen layout. The internal cavity of the rotating disc forms a storage space with the fixed bottom disc, and rotates under the drive of a variable speed motor. In cooperation with the screen with increasing aperture in the clockwise direction, after the infrared sensor triggers vibration, the material falls into the corresponding material bin in order of diameter size, allowing different particle size coal particles to be mixed in a set mass ratio, achieving accurate and rapid grading of coal particle size, effectively solving the problem that the traditional process is difficult to optimize the particle size grading of coal slurry, and improving the quality stability and conveying performance of coarse particle coal slurry.

[0038] 2. The full-automatic coarse particle coal slurry particle size grading preparation system of the present application, through the layered design of the material bin, and the linkage switch and the quality induction switch are respectively arranged in each layer, and the two switches are cooperatively arranged; while the different particle size coal particles are graded and stored, the quality induction switch is opened and closed according to the required quality proportion of the coal particles of different particle sizes for the preparation of the coarse particle coal slurry, and the coal particles are put in as needed; from the coal feeding, particle size grading to the full-process automatic operation of the coal slurry preparation, no excessive manual intervention is needed, the production efficiency is greatly improved, the labor cost is reduced, and the safety and reliability of the production process are improved. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 It is a whole structure schematic diagram of the preferred embodiment of the present application.

[0040] Figure 2 It is a three-dimensional structure schematic diagram of the rotating disc and the fixed bottom disc of the preferred embodiment of the present application (for clear expression of the structure, only one cavity and fixed opening and screen is drawn).

[0041] Figure 3 It is a structure schematic diagram of the fixed bottom disc of the preferred embodiment of the present application (for clear expression of the structure, only one cavity and fixed opening and screen is drawn).

[0042] Figure 4 It is a whole structure schematic diagram of the material bin of the preferred embodiment of the present application.

[0043] In all the drawings, the same reference signs represent the same technical features, specifically: 1 - dust cover, 2 - rotating disc, 21 - cavity, 3 - grating positioner, 4 - fixed bottom disc, 41 - fixed opening, 5 - mounting plate, 51 - first mounting plate, 52 - second mounting plate, 6 - infrared inductor, 7 - spring disc rotating shaft, 8 - variable speed motor, 9 - screen, 10 - material bin, 11 - electromagnetic bin wall vibrator, 12 - linkage switch, 13 - quality induction switch, 14 - slurry preparation tank, 15 - agitator, 16 - clean water pipeline, 17 - quality sensor, 18 - discharge port, 19 - feeding device, 20 - control system. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0045] Example 1

[0046] Please refer to Figure 1 andFigure 2 In order to achieve the above-mentioned purpose, the embodiment 1 proposes a full-automatic coarse particle coal slurry particle size grading preparation system, which comprises a coarse particle coal particle size grading system, a material bin 10 and a slurry preparation tank 14.

[0047] The coarse particle coal particle size grading system comprises a rotating disc 2 and a fixed base disc 4, wherein the rotating disc 2 is arranged above the fixed base disc 4 and has a smaller radius than the fixed base disc 4.

[0048] The rotating disc 2 has a certain thickness and is in a disc-shaped structure. The rotating disc can be integrally cast by using high-quality carbon steel material to ensure the stability of the structure and to withstand the impact and friction of the coal material. A spring disc rotating shaft is firmly welded in the middle of the rotating disc. The rotating shaft is closely connected with a variable speed motor. The variable speed motor is equipped with an advanced frequency conversion speed controller. The rotating speed of the rotating disc can be accurately controlled and can be arbitrarily selected within a certain range to meet the differentiated requirements of different working conditions on the coal particle stirring speed. The variable speed motor is arranged in the rotating disc. A plurality of cavities with the same diameter are uniformly distributed in the circumferential direction of the variable speed motor. The inner wall of the cavity is finely polished, which can reduce the probability of material jamming and facilitate smooth movement of the material.

[0049] As a preferred scheme, in order to reduce environmental pollution, a dust cover 1 is arranged on the upper part of the rotating disc 2. The dust cover is a high-strength transparent acrylic dust cover. A feeding port is formed in the middle of one side of the dust cover. The feeding port is seamlessly connected with a high-power feeding belt machine through a flexible sealing pipeline to prevent dust from escaping during coal feeding and to maintain a clean working environment.

[0050] Please refer to Figure 3 The fixed base disc 4 is made of corrosion-resistant stainless steel plate and is installed on a heavy steel structure base to ensure that there is no shaking or displacement during operation. The first mounting plate 51 and the second mounting plate 52 are respectively welded at the two ends of the circumferential area of the fixed base disc. The grating positioner 3 is arranged on the first mounting plate to identify the initial position of the rotating disc. The infrared sensor 6 is firmly installed at the second mounting plate to quickly capture the information of the material approaching. The fixed base disc 4 remains stationary. A plurality of fixed holes are uniformly formed on the surface of the fixed base disc 4. Different specifications of screens are arranged in different fixed holes. The specifications of the screen apertures increase in turn in the clockwise or counterclockwise direction. The fixed holes make the material bin 10 and the cavities 21 in the rotating disc 2 communicate with each other. The screen is made of high-strength manganese steel, which has excellent wear resistance and impact resistance to ensure that the screen is not damaged during long-term screening operation.

[0051] Specifically, the screen 9 is a planar mesh structure with mesh holes. When the electromagnetic bin wall vibrator 11 is turned on, the electromagnetic bin wall vibrator 11 vibrates the material bin 10 and the screen 9.

[0052] In some other embodiments, to improve the adaptability of the device to different types of coal, an improved full-automatic coarse-grained coal slurry particle size grading preparation system is also provided, which comprises an adjustable screen system composed of a plurality of screens with different aperture sizes, and the screens can be quickly replaced and adjusted according to the particle size and component characteristics of the coal. Specifically, the screen system is designed in a modular structure, each module corresponds to a screen with a specific aperture size, and can be quickly disassembled and installed through simple mechanical or hydraulic devices to adapt to the particle size distribution and physical properties of different coals.

[0053] Please refer to Figure 4 The material bin 10 is in the shape of a cuboid or a cylinder as a whole, with a hollow inner cavity, which is ingeniously divided into upper and lower storage spaces. The bottom of the upper storage space is equipped with an electromagnetic linkage switch, which can quickly control the falling of the material. Four electromagnetic bin wall vibrators are evenly embedded around the bin wall, which are used to assist in the screening and falling of the material, and to prevent the material from being blocked. A mass inductive switch is accurately installed at the bottom of the lower storage space, which monitors the mass of the material in real time and accurately opens when the preset value is reached, so that the lower material can smoothly fall into the slurry preparation tank.

[0054] The slurry preparation tank 14 is a hollow tank body, the main body of which is made of special alloy steel that is resistant to acid and alkali and high temperature, and the inner wall of the tank body is lined with a polytetrafluoroethylene anti-sticking coating to reduce the wall sticking and residue of the coal slurry. An agitator 15 and a mass sensor 17 are built-in, and a clean water pipeline 16 is connected externally, and a discharge port 18 is provided at the bottom of the slurry preparation tank.

[0055] Specifically, as a preferred scheme, the agitator 15 includes an agitator shaft, agitator blades, and a driving motor, which are arranged above the center of the bottom end of the slurry preparation tank 14. The agitator shaft is made of stainless steel, and a plurality of groups of double-layer three-blade agitator blades are evenly welded on the shaft in a spiral shape. The agitator blades are made of high-strength wear-resistant alloy to ensure efficient and durable stirring, and are matched with an intelligent speed regulation system to flexibly control the stirring speed.

[0056] The clean water pipeline 16 is connected with an electric butterfly valve as a switch valve in series, and the butterfly valve has rapid response and good sealing performance.

[0057] Specifically, one end of the clean water pipeline 16 is connected with a water source, and the other end penetrates the tank body of the slurry preparation tank 14, extends into the inside of the tank body, and bends downward close to the tank bottom. The upper end of the discharge port 18 is connected with the bottom end of the slurry preparation tank 14 in a penetrating manner. A pneumatic knife gate valve is installed at the bottom discharge port, which is convenient for remote control and precise control of the discharge of the coal slurry.

[0058] As a preferred scheme, the built-in mass sensor 17 is arranged at the bottom of the slurry preparation tank 14, and the upper part receives the coal particles falling from the material bin 9. A high-precision mass sensor is installed at the center of the bottom of the tank to real-time feedback the mass information of the material and the coal slurry in the tank.

[0059] Example 2

[0060] The present embodiment 2 proposes a full-automatic coarse particle coal slurry particle size grading preparation method, comprising:

[0061] Start-up preparation and parameter setting: the operator starts the control system, and the interface displays a clear and intuitive device state monitoring and parameter setting panel. According to the specific specifications of the coarse particle coal slurry required for this production, the total mass of the coal slurry and the particle size grading requirements are set. At the same time, the rotational disc speed preset value and the electromagnetic bin wall vibrator frequency are input into the control system, laying the foundation for the upcoming production process. The grating positioner automatically locates and calibrates the rotational disc 2 to the standard starting position, ensuring that the starting state of the material screening is consistent.

[0062] Feeding process: start the feeding belt conveyor to continuously feed the pre-crushed coarse particle coal material to the rotational disc 2 feeding port, and the material smoothly falls into the cavity of the rotational disc 2 along the sealed pipeline. As the variable speed motor 8 drives the rotational disc to rotate at a constant speed, the material moves smoothly along the predetermined clockwise direction and gradually approaches the screen 9 area.

[0063] In some other embodiments, in some cases, the coal slurry material may accumulate, so proper forward and reverse rotation is required. In this case, the number of forward and reverse rotations of the rotational disc 2 can also be set, wherein the number of forward and reverse rotations of the rotational disc 2 is in a predetermined ratio to achieve effective classification of coal particles. Specifically, the rotational disc 2 first rotates forward for a certain number of revolutions at a predetermined speed, and then rotates backward for a certain number of revolutions at the same or different speed. By periodically repeating the above forward and reverse rotation process, dynamic classification of coal particles on the rotational disc 2 is achieved. This method allows dynamic adjustment of the number of forward and reverse rotations and speed according to the particle size distribution and mass proportion of the coal to optimize the classification effect. Through the method of the present application, the residence time of particles on the rotational disc 2 can be reduced, and the flowability of particles can be improved, thereby improving the classification efficiency and uniformity.

[0064] Particle size screening trigger: when the infrared sensor 6 sensitively captures the material approaching the screen, it immediately sends an electrical signal to the control system 20, which quickly instructs the electromagnetic bin wall vibrator 11 to start. Instantly, the material bin 10 is accompanied by high-frequency vibration of the electromagnetic bin wall vibrator 11, which drives the built-in screen 9 to vibrate, and the coal material is pushed by the rotational disc 2 and the vibration of the screen 9, starting the particle size screening process.

[0065] Precise particle size classification: following the increasing aperture rule of the screen 9, the smallest coal particles first slide through the smallest screen 9 and fall onto the upper layer of the corresponding material bin 10; the material in other diameter ranges then falls accurately into the corresponding bin, and so on. Different diameter ranges of coal particles are sorted into their respective bins, achieving rapid and accurate particle size classification in an orderly manner. During the entire classification process, the rotational disc 2 speed and the electromagnetic bin wall vibrator 11 frequency remain stable, ensuring the continuity and accuracy of the screening.

[0066] Material control: After the material enters the material bin 10, the upper linkage switch 12 is in an open state, and the material falls smoothly to the lower layer. The lower mass inductive switch 13 monitors the material accumulation quality in real time. Once the lower layer material quality in the certain size material bin reaches the preset proportion corresponding value, the linkage switch 12 is immediately closed, and the mass inductive switch 13 is simultaneously opened. The material is accurately and orderly dropped into the pulping tank 14, and the predetermined particle size ratio is strictly followed.

[0067] Pulping and discharging process: After the material of each size is sequentially dropped into the pulping tank 14, the mass sensor 17 rapidly collects the real-time mass information of the material in the tank and transmits the data to the control system 20. The control system 20 calculates the required amount of clean water and automatically opens the electric butterfly valve of the clean water pipeline 16. The clear water flows into the pulping tank 14 at a preset flow rate. Specifically, the method for calculating the amount of clean water is as follows: first, determine the particle size distribution of the coal and the mass proportion of each particle size, as well as the environmental temperature during the pulping process. Specifically, this method calculates the required amount of clean water by considering the influence of particle size distribution, mass proportion, and temperature on the viscosity of coal slurry; the calculation formula is as follows:

[0068]

[0069] V water represents the required volume of clean water, m coal C represents the total mass of coal in the pulping tank, slurry ρ represents the predetermined concentration of coal slurry, water T represents the environmental temperature f(T, particle size distribution) is a function that considers the influence of temperature and particle size distribution, used to adjust the amount of clean water to compensate for the influence of temperature change and particle size distribution on the viscosity of coal slurry;

[0070] The function is defined as follows:

[0071]

[0072] where a, b, c, and e are constants determined based on experimental data or empirical models, used to describe the influence of temperature and particle size distribution on the viscosity of coal slurry;

[0073] T is the environmental temperature, used to represent the influence of temperature on the viscosity of coal slurry, and a temperature sensor is provided in the system;

[0074] w i is the mass proportion of particles in the i-th particle size interval;

[0075] d i is the representative particle size value of the i-th particle size interval;

[0076] n is the total number of particle size intervals;

[0077] is a weighted sum, representing the comprehensive influence of different particle sizes on the viscosity of coal slurry, wherein e is an index used to describe the degree of influence of particle size on the viscosity of coal slurry;

[0078] The constants a, b, c and e determined by experiments can make the function more accurately reflect the actual working conditions, thereby improving the accuracy of coal slurry preparation and the consistency of coal slurry quality.

[0079] At the same time, the stirrer is started, the driving motor drives the stirring shaft and stirring paddle of the stirrer 15 to rotate at high speed, and the material and clean water are fully and uniformly mixed and stirred, and after high-intensity stirring, the coarse particle coal slurry with uniform and delicate texture and excellent rheological properties is prepared. Finally, the pneumatic knife gate valve of the discharge port 18 is controlled, the coal slurry is discharged at a stable flow rate according to the requirements, and the whole preparation process is completed.

[0080] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the present application and is not intended to limit the present application, and any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A fully automatic coarse-grained coal slurry particle size grading preparation system, characterized in that, The application relates to a coarse-grained coal particle grading system, a material bin (10) and a slurry preparation tank (14). The coarse-grained coal particle grading system comprises a rotating disc (2) and a fixed bottom disc (4); the rotating disc (2) is in a disc structure, and a driving device for driving the rotating disc (2) to rotate is arranged in the middle part; a plurality of through cavities (21) are uniformly arranged around the driving device in the circumferential direction; the rotating disc (2) is rotatably arranged above the fixed bottom disc (4) and has a smaller radius than the fixed bottom disc (4); an installation plate (5) is arranged at the outermost end of the fixed bottom disc (4), and a grating positioner (3) and an infrared sensor (6) are arranged above the installation plate (5) and have a height higher than the upper surface of the rotating disc (2); the fixed bottom disc (4) is fixed and a plurality of through fixed holes (41) are arranged and can overlap the cavities of the rotating disc (2) during rotation of the rotating disc (2); the fixed holes (41) are provided with screen meshes (9) with screen hole specifications increasing in sequence. The material bin (10) is fixed below the fixed holes (41) and is communicated with the fixed holes (41); each material bin (10) is internally provided with upper and lower two layers of storage spaces, the bottom of the upper layer of storage spaces is provided with a linkage switch (12) for controlling opening of the bottom of the layer, and the wall of the upper layer of storage spaces is provided with an electromagnetic bin wall vibrator (11) for driving the bin body to vibrate; the bottom of the lower layer of storage spaces is provided with a quality induction switch (13) for controlling opening of the bottom of the layer; after the quality induction switch is opened, the lower layer of storage spaces is communicated with the slurry preparation tank (14). The slurry preparation tank (14) is a hollow inner cavity tank body, and is internally provided with a stirrer (15), a quality sensor (17) and an external water pipeline (16); and a discharge port (18) is arranged at the bottom of the slurry preparation tank (14). A dust cover (1) is arranged at the upper part of the rotating disc (2), and a feeding port is arranged on one side of the dust cover (1) and is matched with a feeding device (19).

2. The full-automatic coarse-grained coal slurry particle size grading preparation system according to claim 1, characterized in that: The screen mesh (9) is in a mesh structure with mesh holes; after the electromagnetic bin wall vibrator (11) is opened, the material bin (10) and the screen mesh (9) are vibrated by the electromagnetic bin wall vibrator (11).

3. The full-automatic coarse-grained coal slurry particle size grading preparation system according to claim 1, characterized in that: The external water pipeline (16) and the discharge port (18) are both water pipeline structures provided with switch valves; one end of the external water pipeline (16) is connected with a water source, the other end penetrates the tank body of the slurry preparation tank (14) and extends into the tank body; and the upper end of the discharge port (18) is connected with the bottom end of the slurry preparation tank (14).

4. The full-automatic coarse-grained coal slurry particle size grading preparation system according to claim 1, characterized in that: The installation plate comprises a first installation plate (51) and a second installation plate (52) arranged at the other end of the fixed bottom disc (4); the first installation plate (51) and the second installation plate (52) are respectively connected with the grating positioner (3) and the infrared sensor (6).

5. The full-automatic coarse-grained coal slurry particle size grading preparation system according to claim 1, characterized in that: The built-in stirrer (15) comprises a stirring shaft, a stirring paddle and a driving motor, and is arranged above the bottom end of the slurry preparation tank (14).

6. The full-automatic coarse-grained coal slurry particle size grading preparation system according to any one of claims 1-5, characterized in that: S1. The coal slurry parameters are set through a control system (20) and the rotating disc (2) is positioned by the grating positioner (3), so that the rotating direction and rotating speed of the rotating disc (2) are determined.

7. A fully automatic coarse particle coal slurry particle size grading preparation method, which is realized by using the fully automatic coarse particle coal slurry particle size grading preparation system according to claims 1-6, characterized in that, ​ ​ S2. The coarse-grained coal material is fed into the storage space formed by the rotating disc (2) and the fixed bottom disc (4) through the feeding device (19) and moves with the rotating disc; S3. The infrared sensor (6) senses the material and triggers the electromagnetic bin wall vibrator (11) to open, so that the material bin (10) drives the screen (9) to vibrate; S4. The screen (9) has an increasing aperture design, and the material falls into the corresponding material bin through the screen (9) under the push of the rotating disc (2) according to the diameter size; the screen (9) has an increasing aperture design, that is, the aperture of the screen (9) increases in the clockwise direction, and when the material is pushed to the screen (9), small-diameter material preferentially slides through the small-aperture screen (9) to the corresponding material bin (10), and large-diameter material is sequentially pushed by the rotating disc (2) to slide to the subsequent material bin (10); S5. The linkage switch (12) and the mass inductive switch (13) of the material bin (10) control the material to fall into the pulping tank (14) according to the change of the mass of the bottom layer material; the linkage switch (12) and the mass inductive switch (13) have the following specific working mode: initially, the linkage switch (12) of each particle size grading material bin (10) is opened and the mass inductive switch (13) is closed, and the material falls from the upper layer of the material bin (10) to the bottom layer of the material bin (10); when the mass of the bottom layer material reaches the set parameter, the linkage switch (12) is closed and the mass inductive switch (13) is opened; S6. According to the built-in mass sensor (17) of the pulping tank (14), the amount of clean water is calculated and the clean water pipeline (16) is opened, and the different particle size coal particles discharged from the material bin (10) after grading are mixed with clean water to prepare slurry, and after completion, the material is discharged through the discharge port (18).

8. The full-automatic coarse-grained coal slurry particle size grading preparation method according to claim 7, characterized in that: The mass inductive switch (13) of the material bin (10) in step S5 opens to put the coal particles in the corresponding material bin (10) into the pulping tank (14) according to the set mass ratio of different particle sizes of coal particles required for coarse-grained coal slurry preparation.

9. The full-automatic coarse-grained coal slurry particle size grading preparation method according to claim 7, characterized in that: The method for calculating the amount of clean water in step S6 is: first, determine the particle size distribution of coal and the mass proportion of each particle size, and the environmental temperature during pulping; specifically, this method calculates the required amount of clean water by considering the influence of coal particle size distribution, mass proportion and temperature on coal slurry viscosity; the calculation formula is as follows: V water Indicates the required clean water volume, m coal Indicates the total mass of coal in the slurry tank, C slurry represents the predetermined coal slurry concentration, ρ water represents the density of water, T represents the ambient temperature, and f(T, particle size distribution) is a function that takes into account the effects of temperature and particle size distribution and is used to adjust the amount of clean water to compensate for the effects of temperature changes and particle size distribution on coal slurry viscosity; The function is defined as follows: where a, b, c and e are constants determined according to experimental data or empirical models, used to describe the influence of temperature and particle size distribution on coal slurry viscosity; T is the environmental temperature, used to represent the influence of temperature on coal slurry viscosity, and a temperature sensor is provided in the system; w i is the mass proportion of particles in the i-th particle size interval; d i is the representative particle size value of the i-th particle size interval; n is the total number of particle size intervals; is a weighted sum, representing the comprehensive influence of particles of different sizes on the viscosity of the coal slurry, where e is an index used to describe the degree of influence of particle size on the viscosity of the coal slurry; The constants a, b, c and e determined by experiments can make the function more accurately reflect the actual working conditions, thereby improving the accuracy of coal slurry preparation and the consistency of coal slurry quality.

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