Coal slurry preparation system

Abstract

The utility model provides a coal slurry preparation system, comprising: a coal mill provided with a feed port and a discharge port; the drum screen is communicated with the discharge hole and is fixedly connected with the coal mill; the driving assembly is in driving connection with the coal mill so as to drive the coal mill to rotate around the axial direction of the driving assembly; the feeding device is provided with an inlet and an outlet, and the outlet is communicated with the feeding port and is rotatably connected with the feeding port; the feeding pipe is communicated with an inlet of the feeding device; the outer cover covers the drum screen and abuts against the outer wall of the coal mill; the coal slurry storage tank is communicated with the outer cover through a coal slurry pipeline; the discharge pipe is communicated with the drum screen and located on the side, away from the coal mill, of the coal slurry storage tank, and a discharge valve is installed in the discharge pipe; the first end of the communicating pipeline communicates with the outer cover, and an exhaust fan is arranged in the communicating pipeline; the emptying pipeline is connected with the second end of the communicating pipeline, and an emptying valve is arranged in the emptying pipeline; the two opposite ends of the circulating pipeline are connected with the second end of the communicating pipeline and an inlet of the feeding device correspondingly, and a circulating valve is arranged in the circulating pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of coal slurry preparation, in particular to a coal slurry preparation system. Background Art

[0002] In industrial production, various production wastewaters are generally used to prepare water-coal slurry. Raw coal, water, and additives are fed to the pulverizer through a feed device in a certain proportion. Inside the pulverizer, the coal particles are ground by steel rods or steel balls, becoming finer and entering the coal slurry drum screen. Qualified coal slurry is filtered through the drum screen and then enters the coal slurry storage tank. The larger coal lumps and debris that are screened out are discharged through the discharge pipe. The wastewater and raw coal will generate a certain amount of heat during the pulverizer grinding process, evaporating some steam and some odorous gases. The odorous steam is emitted from the pulverizer drum screen, which is not conducive to the operator's inspection of the coal slurry status in the pulverizer. Utility Model Content

[0003] In view of this, the utility model provides a coal slurry preparation system to solve the above technical problems.

[0004] The coal slurry preparation system provided by the utility model includes:

[0005] A coal mill, wherein the coal mill is provided with an inlet and an outlet;

[0006] a drum screen, the drum screen being communicated with the discharge port and fixedly connected to the coal mill;

[0007] a drive assembly, the drive assembly being drivingly connected to the coal mill to drive the coal mill to rotate about its axial direction;

[0008] A feeding device, wherein the feeding device is provided with an inlet and an outlet, the outlet is connected to the feeding port and is rotatably connected thereto;

[0009] a feed pipe, the feed pipe being in communication with an inlet of the feed device;

[0010] an outer cover, wherein the outer cover covers the drum screen and abuts against an outer wall of the coal mill;

[0011] a coal slurry storage tank, the coal slurry storage tank being connected to the outer cover via a coal slurry pipeline;

[0012] a discharge pipe, the discharge pipe being in communication with the drum screen and being located on a side of the coal slurry storage tank away from the coal mill, wherein a discharge valve is installed in the discharge pipe;

[0013] a communicating pipe, wherein a first end of the communicating pipe is in communication with the outer cover, and an exhaust fan is provided in the communicating pipe;

[0014] a vent pipe connected to the second end of the communicating pipe, wherein a vent valve is provided in the vent pipe;

[0015] A circulation pipeline, wherein opposite ends of the circulation pipeline are respectively connected to the second end of the communicating pipeline and the inlet of the feeding device, and a circulation valve is provided in the circulation pipeline.

[0016] Optionally, the coal slurry preparation system further includes: an air supply pipeline, the air supply pipeline is connected to the circulation pipeline, and an air supply valve is provided in the air supply pipeline.

[0017] Optionally, the coal slurry preparation system further includes:

[0018] a first coal slurry detector and a second coal slurry detector arranged in the drum screen along the axial direction thereof at intervals;

[0019] a controller, wherein an input end of the controller is communicatively connected to output ends of the first coal slurry detector and the second coal slurry detector;

[0020] An alarm, wherein an input end of the alarm is communicatively connected to an output end of the controller.

[0021] Optionally, the coal slurry preparation system also includes: a raw coal pipeline, a water inlet pipeline and an additive pipeline, the raw coal pipeline, the water inlet pipeline and the additive pipeline are respectively connected to the feed pipe, a water supply valve is installed on the water inlet pipeline, and the control end of the water supply valve is communicatively connected to the output end of the controller.

[0022] Optionally, a camera is provided in the drum screen.

[0023] Optionally, the coal slurry preparation system further includes: a flushing water pipeline, which passes through the outer cover and extends into the drum screen, and is used to flush the first coal slurry detector, the second coal slurry detector and the camera, and a flushing valve is installed on the flushing water pipeline.

[0024] Optionally, the coal slurry preparation system further includes: a purge air pipeline, which passes through the outer cover and extends into the drum screen, and is used to purge the first coal slurry detector, the second coal slurry detector and the camera, and a purge valve is installed on the purge air pipeline.

[0025] Optionally, the coal slurry preparation system further comprises: a coarse particle storage tank, the coarse particle storage tank is provided with an inlet and a discharge port, the inlet is communicated with the discharge pipe, and the discharge port is provided with a discharge valve.

[0026] Optionally, the coal slurry preparation system further includes:

[0027] A material level meter, the material level meter is arranged in the coarse particle storage tank, and the output end of the material level meter is communicatively connected to the input end of the controller;

[0028] The output end of the controller is communicatively connected with the control ends of the discharge valve and the exhaust valve.

[0029] Optionally, the coal slurry preparation system further includes: a balancing pipeline, the balancing pipeline being connected to the coarse particle storage tank, and a pressure balancing valve being provided on the balancing pipeline.

[0030] Compared with the prior art, the above technical solution provided by the present invention has at least the following beneficial effects:

[0031] By adopting the coal slurry preparation system of the present invention, during the operation of the system, the odorous gas and steam generated inside the coal mill and the drum screen flow in the circulation loop formed by the coal mill, the drum screen, the connecting pipe, the circulation pipe and the feeding device, and will not be released into the external environment, which can prevent the operator from inhaling and will not cause environmental pollution. In addition, the non-discharge of steam can reduce the heat loss of the coal slurry, thereby further saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of a coal slurry preparation system according to an embodiment of the present invention.

[0033] Reference numerals:

[0034] 1: Coal mill; 2: Drum screen; 3: Feed device; 4: Feed pipe; 5: Outer cover; 6: Coal slurry storage tank; 7: Discharge pipe; 8: Connecting pipe; 9: Vent pipe; 10: Circulation pipe; 11: Coal slurry pipeline; 12: Discharge valve; 13: Exhaust fan; 14: Vent valve; 15: Circulation valve; 16: Air supply pipeline; 17: Air supply valve; 18: First coal slurry detector; 19: Second coal slurry detector; 20: Raw coal pipeline; 21: Water inlet pipeline; 22: Additive pipeline; 23: Water supply valve; 24: Camera; 25: Flushing water pipeline; 26: Purge air pipeline; 27: Coarse particle storage tank; 28: Discharge valve; 29: Level meter; 30: Balance pipeline; 31: Pressure balance valve; 32: Flushing valve; 33: Purge valve. DETAILED DESCRIPTION

[0035] The embodiments of the present invention will be further described below with reference to the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0036] Figure 1 This is a schematic diagram of a coal slurry preparation system according to an embodiment of the present invention. Figure 1 As shown, the coal slurry preparation system includes a coal mill 1, a drum screen 2, a drive assembly (not shown), a feeding device 3, a feeding pipe 4, an outer cover 5, a coal slurry storage tank 6, a discharge pipe 7, a connecting pipe 8, a venting pipe 9 and a circulation pipe 10. The coal mill 1 is provided with a feed port and a discharge port; the drum screen 2 is connected to the discharge port and is fixedly connected to the coal mill 1; the drive assembly is driven and connected to the coal mill 1 to drive the coal mill 1 to rotate around its axial direction; the feeding device 3 is provided with an inlet and an outlet, the outlet is connected to the feed port and is rotatably connected; the feed pipe 4 is connected to the inlet of the feeding device 3; the outer cover 5 covers the drum screen 2 and abuts against the outer wall of the coal mill 1; the coal slurry storage tank 6 is connected to the outer cover 5 through the coal slurry pipeline 11; the discharge pipe 7 is connected to the drum screen 2 and is located on the side of the coal slurry storage tank 6 away from the coal mill 1, and a discharge valve 12 is installed in the discharge pipe 7; the first end of the connecting pipe 8 is connected to the outer cover 5, and an exhaust fan 13 is provided in the connecting pipe 8; the vent pipe 9 is connected to the second end of the connecting pipe 8, and a vent valve 14 is provided in the vent pipe 9; the opposite ends of the circulation pipe 10 are respectively connected to the second end of the communicating pipe 8 and the inlet of the feeding device 3, and a circulation valve 15 is provided in the circulation pipe 10.

[0037] During the normal operation of the system in preparing coal slurry, the vent valve 14 is closed, the circulation valve 15 and the discharge valve 12 are opened, the exhaust fan 13 and the drive assembly are started, and the pulverizer 1 rotates under the drive of the drive assembly, and drives the drum screen 2 fixedly connected to it to rotate accordingly. The mixture of raw coal, water and coal slurry additives enters the feeding device 3 through the feeding pipe 4, and further enters the rotating pulverizer 1 through the feeding device 3. Under the grinding action of the steel rods or steel balls in the pulverizer 1, the coal particles are fined to form coal slurry, and enter the drum screen 2 as the pulverizer 1 rotates. The coal slurry is filtered by the drum screen 2, and the coal slurry that meets the particle size requirements passes through the drum screen 2 and falls into the outer cover 5, and further falls into the coal slurry storage tank 6 for storage through the coal slurry pipeline 11 connected to the outer cover 5. Coal blocks and debris with larger particles are further moved away from the pulverizer 1 as the drum screen 2 rotates, and finally fall into the discharge pipe 7 connected to the drum screen 2 and are discharged to the outside. During the operation of the system, under the suction of the exhaust fan 13, the odorous gases and steam generated inside the drum screen 2 are discharged through the connecting pipe 8 connected to the outer cover 5, enter the circulation pipe 10 connected thereto, and are further discharged into the feeding device 3 connected to the circulation pipe 10, where they mix with the material at a relatively low temperature, causing the steam to condense. During the process of preparing coal slurry during the operation of the system, the odorous gases and steam always circulate and reach saturation in the circulation loop formed by the coal mill 1, the drum screen 2, the connecting pipe 8, the circulation pipe 10 and the feeding device 3, and are not released to the outside of the system. When the system stops running and the internal system needs to be inspected and repaired, the circulation valve 15 and the discharge valve 12 are closed, and the vent valve 14 is opened, so that the coal mill 1 and the drum screen 2 are connected to the external atmosphere, forming air circulation, which is convenient for personnel to perform inspections and other operations.

[0038] By adopting the coal slurry preparation system of the present invention, during the operation of the system, the odorous gas and steam generated inside the coal mill 1 and the drum screen 2 flow in the circulation loop formed by the coal mill 1, the drum screen 2, the connecting pipe 8, the circulation pipe 10 and the feeding device 3, and will not be dispersed into the external environment, which can prevent the operator from inhaling and will not cause environmental pollution. In addition, the non-discharge of steam can also reduce the heat loss of the coal slurry, thereby further saving energy.

[0039] like Figure 1As shown, in this embodiment, the coal mill 1 and the drum screen 2 are coaxially arranged, the feed port at the left end of the coal mill 1 is connected to the outlet of the feed device 3, and the discharge port at the right end is connected to the drum screen 2. The coal mill 1 and the drum screen 2 are fixedly connected so that when the driving component drives the coal mill 1 to rotate, the drum screen 2 rotates accordingly. The outer cover 5 and the drum screen 2 are both hollow cylindrical. The outer cover 5 is sleeved on the outside of the drum screen 2 and is coaxially arranged with the drum screen 2 and abuts against the right outer wall of the coal mill 1. During the rotation of the coal mill 1, the outer cover 5 is in close contact with the right side wall of the coal mill 1, which does not affect the normal rotation of the coal mill 1 and can ensure that the coal slurry does not leak out from the contact point between the outer cover 5 and the coal mill 1. In order to further prevent the coal slurry from leaking out, a sealing ring can be set between the outer cover 5 and the outer wall of the coal mill 1. The outer cover 5 has a hole at approximately the center of its lower sidewall, connecting it to a coal slurry pipeline 11. This pipeline 11 connects to the coal slurry storage tank 6. Coal slurry ground in the pulverizer 1 and reaching the required particle size is filtered by the drum screen 2 and then falls into the outer cover 5. It is then transported through the coal slurry pipeline 11 to the coal slurry storage tank 6 for storage. At the rightmost end of the drum screen 2 and outer cover 5, away from the pulverizer 1, a discharge pipe 7 penetrates the outer cover 5 and the drum screen 2. Coarse coal particles and impurities that do not meet the required particle size and move to the rightmost end of the drum screen 2 as it rotates are discharged to the outside through the discharge pipe 7. The outer cover 5 is connected to a connecting pipe 8 at approximately the center of its upper sidewall. The upper ends of the connecting pipe 8 are connected to a vent pipe 9 and a circulation pipe 10, respectively. The left end of the circulation pipe 10 extends to connect to the inlet of the feed device 3, forming a closed loop. The vent pipe 9 is connected to the atmosphere. According to the actual application situation, the driving component can be composed of any structure as long as it can drive the coal mill 1 to rotate. The coal mill 1 is a mature existing technology, and its specific working principle will not be repeated here. The specifications and dimensions of the coal mill 1, the drum screen 2, and the outer cover 5 can be adjusted, and the screening standard of the drum screen 2 can also be adjusted.

[0040] Optionally, the coal slurry preparation system further includes an air supply pipe 16, which is connected to the circulation pipe 10 and has an air supply valve 17 disposed therein. This arrangement can achieve rapid air supply and ventilation in the coal mill 1.

[0041] like Figure 1 As shown, the air supply pipe 16 is connected to one end of the circulation pipe 10 near the feeding device 3. When the coal mill 1 is shut down for maintenance, the circulation valve 15 is closed, the vent valve 14 and the air supply valve 17 are opened, and the exhaust fan 13 is started. Then, under the suction of the exhaust fan 13, fresh air from the outside enters the feeding device 3 through the circulation pipe 10, and further flows through the coal mill 1, the drum screen 2 and the connecting pipe 8, and finally replaces the original turbid air inside and is discharged through the vent pipe 9, thereby ensuring the circulation of fresh air in the coal mill 1 and the drum screen 2, and ensuring the safety of the maintenance process.

[0042] Optionally, the coal slurry preparation system further includes a first coal slurry detector 18 and a second coal slurry detector 19 spaced apart along the axial direction of the drum screen 2, a controller (not shown), and an alarm (not shown). The input end of the controller is communicatively connected to the output end of the first coal slurry detector 18 and the second coal slurry detector 19; the input end of the alarm is communicatively connected to the output end of the controller. This arrangement can monitor the position of the coal slurry passing through the drum screen 2 through the first coal slurry detector 18 and the second coal slurry detector 19. If the coal slurry passes through the drum screen 2 and falls into the outer cover 5 between the first coal slurry detector 18 and the second coal slurry detector 19, it indicates that the coal slurry is within an appropriate concentration range and there is no need to adjust the coal slurry concentration. If the coal slurry passes through the drum screen 2 and falls into the outer cover 5 before it moves to the position of the first coal slurry detector 18, or if the coal slurry has not completely passed through the drum screen 2 and falls into the outer cover 5 when it moves to the position of the second coal slurry detector 19, it indicates that the coal slurry concentration is inappropriate and needs to be adjusted. At this time, the controller controls the alarm to sound an alarm to prompt the operator to take action.

[0043] like Figure 1 As shown, the first coal slurry detector 18 and the second coal slurry detector 19 are horizontally spaced apart in the drum screen 2. The first coal slurry detector 18 is close to the left end of the drum screen 2 and keeps a certain distance from the left end. The second coal slurry detector 19 is close to the right end of the drum screen 2 and keeps a certain distance from the right end. The first coal slurry detector 18 monitors the first position data of the coal slurry in real time, and the second coal slurry detector 19 monitors the second position data of the coal slurry in real time, and transmits the first position data and the second position data to the controller in real time. When the first position data indicates that the coal slurry is detected, and the second position data indicates that the coal slurry is not detected, at this time, the coal slurry is in an appropriate concentration range and there is no need to adjust the coal slurry concentration; when both the first position data and the second position data indicate that the coal slurry is not detected, it indicates that the concentration of the coal slurry is too low, and it has passed through the drum screen 2 and fallen into the outer cover 5 before moving to the position of the first coal slurry detector 18. At this time, the controller controls the alarm to sound an alarm to prompt the operator to adjust and increase the coal slurry concentration; when both the first position data and the second position data indicate that the coal slurry is detected, it indicates that the concentration of the coal slurry is too high, and it has not completely passed through the drum screen 2 and fallen into the outer cover 5 when moving to the position of the second coal slurry detector 19. At this time, the controller controls the alarm to sound an alarm to prompt the operator to adjust and reduce the coal slurry concentration. Depending on the actual application, the alarm can be an audible alarm, a light alarm, or other alarms. Different alarms can also be issued for situations where the coal slurry concentration is too low or too high. The controller controls the alarm's alarm logic based on changes in the first position data and the second position data. This can be implemented using existing mature algorithms, and its specific working principle will not be detailed here.

[0044] Optionally, the coal slurry preparation system further includes a raw coal pipeline 20, a water inlet pipeline 21, and an additive pipeline 22. Each of these pipelines is connected to the feed pipe 4. A water supply valve 23 is mounted on the water inlet pipeline 21, and the control end of the water supply valve 23 is communicatively connected to the output end of the controller. This arrangement allows the opening of the water supply valve 23 to be automatically controlled based on changes in coal slurry concentration, thereby adjusting the coal slurry concentration and eliminating manual adjustment.

[0045] like Figure 1 As shown, in this embodiment, the raw coal pipeline 20, the water inlet pipeline 21, and the additive pipeline 22 are respectively connected to the feed pipe 4. The raw coal, water, and additives are transported into the feed pipe 4 in a certain proportion and further enter the feed device 3. When the first position data and the second position data both indicate that no coal slurry is detected, it indicates that the concentration of the coal slurry is too low. At this time, the controller controls the opening of the water supply valve 23 to decrease, and the amount of water entering the feed device 3 per unit time is reduced, thereby appropriately increasing the concentration of the coal slurry; when the first position data and the second position data both indicate that coal slurry is detected, it indicates that the concentration of the coal slurry is too high. At this time, the controller controls the opening of the water supply valve 23 to increase, and the amount of water entering the feed device 3 per unit time is increased, thereby appropriately reducing the concentration of the coal slurry.

[0046] Optionally, a camera 24 is provided in the drum screen 2. Through the camera 24, the internal conditions of the drum screen 2 and the coal mill 1 can be observed more intuitively, eliminating the need for manual on-site inspections and reducing the labor intensity of on-site operators.

[0047] like Figure 1 As shown, the camera 24 is mounted near the right end of the trommel 2. The image data captured by the camera 24 can be transmitted to an external display device. The number of cameras 24 and their specific installation positions within the trommel 2 can be adjusted according to actual application conditions. The cameras 24 can be of any specifications and models suitable for the working environment within the trommel 2.

[0048] Optionally, the coal slurry preparation system further includes a flushing water line 25, which passes through the outer cover 5 and extends into the drum screen 2. The flushing water line 25 is used to flush the first coal slurry detector 18, the second coal slurry detector 19, and the camera 24. A flushing valve 32 is installed on the flushing water line 25. To prevent the coal slurry detector and the camera 24 from being covered by the coal slurry and becoming ineffective, the flushing water line 25 can be used to spray water on the coal slurry detector and the camera 24 to ensure that they are not covered by the coal slurry and maintain normal working condition.

[0049] like Figure 1As shown, in this embodiment, the flushing water pipeline 25 passes through the right end side wall of the outer cover 5 and extends to the interior of the drum screen 2, and is connected to a branch pipeline inside the drum screen 2, corresponding to the positions of the first coal slurry detector 18, the second coal slurry detector 19 and the camera 24 respectively. The flushing water pipeline 25 is connected to a high-pressure water source. When the flushing valve 32 is opened, the high-pressure water source is sprayed toward the first coal slurry detector 18, the second coal slurry detector 19 and the camera 24 to clean the covered coal slurry. The opening timing of the flushing valve 32 can be set as needed. For example, the opening time can be manually selected based on operating experience, or the opening time interval can be set in the controller. The flushing valve 32 is automatically opened after each set time interval. The flushing valve 32 can also be opened when it is observed that the image transmitted by the camera 24 is not clear.

[0050] Optionally, the coal slurry preparation system further includes a purge air line 26, which passes through the outer cover 5 and extends into the drum screen 2. The purge air line 26 is used to purge the first coal slurry detector 18, the second coal slurry detector 19, and the camera 24. A purge valve 33 is installed on the purge air line 26. After flushing the first coal slurry detector 18, the second coal slurry detector 19, and the camera 24 with the flushing water line 25, any water marks remaining on the surface can be dried by introducing airflow through the purge air line 26, thereby quickly eliminating the water marks.

[0051] like Figure 1 As shown, in this embodiment, the purge air line 26 is connected to the flushing water line 25 on the left side of the flushing valve 32. When the coal slurry detector and camera 24 need to be flushed, the flushing valve 32 is opened and the purge valve 33 is closed at the same time. The high-pressure water source enters the drum screen 2 through the flushing water line 25 and is sprayed out at the corresponding positions of the coal slurry detector and camera 24 to perform the flushing operation. After the flushing is completed, when the coal slurry detector and camera 24 need to be purged and dried, the flushing valve 32 is closed and the purge valve 33 is opened at the same time. The high-pressure air source enters the drum screen 2 through the purge air line 26 and the flushing water line 25 and is sprayed out at the corresponding positions of the coal slurry detector and camera 24 to perform the purging and drying operation. The purge air line 26 can also directly pass through the outer cover 5 and extend into the drum screen 2, corresponding to the coal slurry detector and camera 24.

[0052] Optionally, the coal slurry preparation system further includes a coarse particle storage tank 27, which has an inlet and a discharge port. The inlet is connected to the discharge pipe 7, and the discharge port is equipped with a discharge valve 28. During system operation, coal lumps and debris with larger particle sizes that cannot pass through the drum screen 2 are transported to the discharge pipe 7 as the drum screen 2 rotates. They then fall into the coarse particle storage tank 27 through the discharge pipe 7, where they are stored. After a certain amount of coal is stored, it is discharged in a centralized manner, making it easier for operators to handle the coal.

[0053] like Figure 1As shown, during the operation of the system, the discharge valve 12 is opened and the discharge valve 28 is closed at the same time, and the coal lumps and debris with larger particle sizes are discharged through the discharge pipe 7 to the coarse particle storage tank 27 for storage; after the system has been running for a period of time, when it is determined that there are more coal lumps stored in the coarse particle storage tank 27, the discharge valve 12 is closed and the discharge valve 28 is opened at the same time, and the coal lumps and debris in the coarse particle storage tank 27 are discharged.

[0054] Optionally, the coal slurry preparation system further includes a level meter 29 , which is disposed in the coarse particle storage tank 27 , and the output end of the level meter 29 is communicatively connected to the input end of the controller; the output end of the controller is communicatively connected to the control end of the discharge valve 12 and the discharge valve 28 .

[0055] When the system is running, the discharge valve 12 is in the open state and the discharge valve 28 is in the closed state. Figure 1 As shown, the material level meter 29 is set near the top of the coarse particle storage tank 27, and monitors the material height data in the coarse particle storage tank 27 in real time, and transmits the material height data to the controller. The controller has a pre-stored height threshold. When the material height data is greater than the height threshold, the controller controls the discharge valve 12 to close and the discharge valve 28 to open, so as to discharge the material in the coarse particle storage tank 27. After the discharge time is set, the discharge valve 28 is controlled to close and the discharge valve 12 is opened. The control logic of the controller controlling the opening and closing of the discharge valve 12 and the discharge valve 28 according to the material height data monitored by the material level meter 29 can be implemented according to existing mature algorithms, and its specific working principle will not be repeated here.

[0056] Optionally, the coal slurry preparation system further includes a balancing line 30, which is connected to the coarse particle storage tank 27 and is provided with a pressure balancing valve 31. When the discharge valve 12 is closed and the discharge valve 28 is opened to discharge the coal lumps and debris in the coarse particle storage tank 27, if a negative pressure is formed in the coarse particle storage tank 27, the coal lumps and debris will not be easily discharged. The balancing line 30 introduces airflow, eliminates the negative pressure, and facilitates the smooth discharge of the coal lumps and debris.

[0057] The balance pipe 30 is provided with a pressure balance valve 31, one end of which is connected to the coarse particle storage tank 27 and the other end can be connected to the atmosphere. When the coarse particle storage tank 27 is discharging, the pressure balance valve 31 is opened, and the coarse particle storage tank 27 is connected to the atmosphere, and no negative pressure is formed inside. The other end of the balance pipe 30 can also be connected to the atmosphere. Figure 1 As shown, the purge air line 26 is connected to the purge valve 33 on the side away from the drum screen 2. When the coarse particle storage tank 27 is discharging, the pressure balance valve 31 is opened, and the balance line 30 is connected to the high-pressure gas source. The high-pressure gas source enters the coarse particle storage tank 27 through the purge air line 26 and the balance line 30, promoting the smooth discharge of coal and debris inside. The balance line 30 can also be connected to a high-pressure water source instead of a high-pressure gas source.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A coal slurry preparation system, characterized in that: include: A coal mill, wherein the coal mill is provided with an inlet and an outlet; a drum screen, the drum screen being communicated with the discharge port and fixedly connected to the coal mill; a drive assembly, the drive assembly being drivingly connected to the coal mill to drive the coal mill to rotate about its axial direction; A feeding device, wherein the feeding device is provided with an inlet and an outlet, the outlet is connected to the feeding port and is rotatably connected thereto; a feed pipe, the feed pipe being in communication with an inlet of the feed device; an outer cover, wherein the outer cover covers the drum screen and abuts against an outer wall of the coal mill; a coal slurry storage tank, the coal slurry storage tank being connected to the outer cover via a coal slurry pipeline; a discharge pipe, the discharge pipe being in communication with the drum screen and being located on a side of the coal slurry storage tank away from the coal mill, wherein a discharge valve is installed in the discharge pipe; a communicating pipe, wherein a first end of the communicating pipe is in communication with the outer cover, and an exhaust fan is provided in the communicating pipe; a vent pipe connected to the second end of the communicating pipe, wherein a vent valve is provided in the vent pipe; A circulation pipeline, wherein opposite ends of the circulation pipeline are respectively connected to the second end of the communicating pipeline and the inlet of the feeding device, and a circulation valve is provided in the circulation pipeline.

2. The coal slurry preparation system according to claim 1, characterized in that: Also includes: An air supply pipeline is connected to the circulation pipeline, and an air supply valve is provided in the air supply pipeline.

3. The coal slurry preparation system according to claim 1 or 2, characterized in that: Also includes: a first coal slurry detector and a second coal slurry detector arranged in the drum screen along the axial direction thereof at intervals; a controller, wherein an input end of the controller is communicatively connected to output ends of the first coal slurry detector and the second coal slurry detector; An alarm, wherein an input end of the alarm is communicatively connected to an output end of the controller.

4. The coal slurry preparation system according to claim 3, characterized in that: It also includes a raw coal pipeline, a water inlet pipeline and an additive pipeline. The raw coal pipeline, the water inlet pipeline and the additive pipeline are respectively connected to the feed pipe. A water supply valve is installed on the water inlet pipeline. The control end of the water supply valve is communicatively connected to the output end of the controller.

5. The coal slurry preparation system according to claim 3, characterized in that: A camera is provided in the drum screen.

6. The coal slurry preparation system according to claim 5, characterized in that: Also includes: A flushing water pipeline passes through the outer cover and extends into the drum screen, and is used for flushing the first coal slurry detector, the second coal slurry detector and the camera. A flushing valve is installed on the flushing water pipeline.

7. The coal slurry preparation system according to claim 6, characterized in that: Also includes: A purge air pipeline passes through the outer cover and extends into the drum screen, and is used for purging the first coal slurry detector, the second coal slurry detector and the camera. A purge valve is installed on the purge air pipeline.

8. The coal slurry preparation system according to claim 3, characterized in that: Also includes: A coarse particle storage tank is provided with an inlet and a discharge port, wherein the inlet is communicated with the discharge pipe, and the discharge port is provided with a discharge valve.

9. The coal slurry preparation system according to claim 8, characterized in that: Also includes: A material level meter, the material level meter is arranged in the coarse particle storage tank, and the output end of the material level meter is communicatively connected to the input end of the controller; The output end of the controller is communicatively connected with the control ends of the discharge valve and the exhaust valve.

10. The coal slurry preparation system according to claim 8, characterized in that: Also includes: A balancing pipeline is connected to the coarse particle storage tank, and a pressure balancing valve is provided on the balancing pipeline.

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