A production system for increasing the concentration of coal water slurry

Abstract

The utility model belongs to a kind of production system of improving coal water slurry concentration;Including raw material coal shed, and rod mill, the raw material coal shed is connected with primary coal bunker by primary crushing unit, primary coal bunker is connected with the import of rod mill and secondary crushing unit respectively, secondary crushing unit is connected with the import of rod mill by secondary coal bunker;The import of rod mill is also connected with coal grinding water tank and additive tank, the outlet of rod mill is connected with primary drum screen, the dust outlet of primary drum screen is connected with tail gas treatment unit, the coal water slurry outlet of primary drum screen is connected with coal water slurry stirring treatment unit;Through the coal powder of two different particle sizes, before adding water to form coal water slurry, they fill each other, reduce gap, can improve the packing efficiency of coal in water, to improve the concentration of coal water slurry, it not only can solve the problem existing in the operation of existing fine grinder, adjust coal water slurry concentration according to actual requirement, and make the concentration of coal water slurry highest to about 65%.

Description

Technical Field

[0001] This utility model belongs to the field of coal-water slurry preparation technology, specifically a production system for increasing the concentration of coal-water slurry. Background Technology

[0002] Coal-water slurry is a coal-based fluid feedstock composed of coal, water, and additives. As a feedstock for coal-water slurry gasification, it is widely used in the production of synthetic ammonia, methanol, olefins, oil products, and natural gas. Specifically, coal-water slurry consists of 50-70% coal, 30-50% water, and 0.1-1.0% additives. It possesses the combustion characteristics of coal while exhibiting liquid combustion application characteristics similar to heavy oil, making it an excellent fuel and gasification feedstock. For production operations, increasing the concentration of coal-water slurry can effectively reduce specific coal consumption and specific oxygen consumption during the production process, increase coal slurry gas production, reduce production and operating costs, and improve production economics.

[0003] In industrial coal-water slurry preparation systems, water, coal, and additives are added to a rod mill in specific proportions for mixing and grinding. This system results in a low coal bulk density, with a slurry concentration limited to below 60%. To increase the concentration, some companies introduce a fine grinding mill after the rod mill to further grind the coal slurry. The finely ground slurry is then returned to the rod mill for mixing, improving particle size distribution and bulking efficiency, thus raising the coal-water slurry concentration to around 63%. However, using a fine grinding mill presents several problems: 1. It has limited processing capacity and a high failure rate; 2. Excessive ineffective grinding during the fine grinding process leads to low grinding efficiency. Due to these issues, some companies, even after purchasing such equipment, often leave their fine grinding mills idle. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a production system for increasing the concentration of coal-water slurry, thereby solving the technical problems existing in the prior art.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A production system for increasing the concentration of coal-water slurry includes a raw coal shed and a rod mill. The raw coal shed is connected to a primary coal bunker via a primary crushing unit. The primary coal bunker is connected to the inlet of the rod mill and a secondary crushing unit. The secondary crushing unit is connected to the inlet of the rod mill via a secondary coal bunker. The inlet of the rod mill is also connected to a coal grinding water tank and an additive tank. The outlet of the rod mill is connected to a primary drum screen. The dust outlet of the primary drum screen is connected to a tail gas treatment unit. The coal-water slurry outlet of the primary drum screen is connected to a coal-water slurry mixing and treatment unit.

[0007] The beneficial effects of this utility model are as follows: This utility model abandons the traditional technical route of using a fine grinding mill for wet grinding to increase the concentration of coal-water slurry. Instead, it crushes the coal in the raw coal bunker into coal powder of the same particle size using a primary crushing unit. Based on the target concentration of the coal-water slurry, a portion of the coal powder from the primary coal bunker is transported to a secondary crushing unit for deep crushing. Then, according to the actual situation, two different particle sizes of coal powder are transported to a rod mill to prepare the coal-water slurry. In other words, this utility model contains two different particle sizes of coal powder. Before water is added to form the coal-water slurry, the two particles fill each other, reducing voids and improving the coal's packing efficiency in water, thereby increasing the concentration of the coal-water slurry. Specifically, the above method can not only increase the coal-water slurry concentration to a maximum of about 65%, but also adjust the concentration according to actual conditions. The above process setting not only solves the problems existing in the operation of existing fine grinding mills, but also adjusts the coal-water slurry concentration according to actual requirements, and increases the concentration of the coal-water slurry to a maximum of about 65%.

[0008] Preferably, the primary crushing unit includes a cross screen, the inlet of which is connected to the raw material coal shed, the undersize outlet of which is connected to the primary coal bunker, the oversize outlet of which is connected to the primary crusher, and the outlet of which is connected to the primary coal bunker.

[0009] Preferably, the secondary crushing unit includes a fine cross screen connected to the outlet of the primary coal bunker, the undersize outlet of the fine cross screen is connected to the secondary coal bunker, the oversize outlet of the fine cross screen is connected to the secondary crusher, and the outlet of the secondary crusher is connected to the secondary coal bunker.

[0010] Preferably, the secondary crushing unit includes a medium-speed roller mill connected to the outlet of the primary coal bunker, the outlet of the medium-speed roller mill being connected to a cyclone separator, and the solid phase outlet of the cyclone separator being connected to the secondary coal bunker.

[0011] Preferably, the gas phase outlet of the cyclone separator is connected to the inlet of the medium-speed roller mill via a gas phase pipeline with a circulating fan, and a fresh air pipeline with a valve is provided on the gas phase pipeline between the gas phase outlet of the cyclone separator and the circulating fan.

[0012] Preferably, a first weighing feeder is provided between the primary coal bunker and the inlet of the rod mill, and a second weighing feeder is provided between the secondary coal bunker and the inlet of the rod mill.

[0013] Preferably, a coal grinding water pump is provided between the coal grinding water tank and the inlet of the rod mill, and an additive pump is provided between the additive tank and the inlet of the rod mill.

[0014] Preferably, the coal-water slurry mixing and processing unit includes a discharge trough connected to the coal-water slurry outlet of the primary drum screen. The outlet of the discharge trough is connected to the coal-water slurry tank via a primary coal slurry pump and a secondary drum screen. The outlet of the coal-water slurry tank is connected to the coal-water slurry usage section via a secondary coal slurry pump.

[0015] Preferably, the discharge trough and the coal-water slurry trough are respectively provided with a stirring section for achieving a homogeneous state of the material; the stirring section includes a stirring motor provided at the top of the discharge trough and the coal-water slurry trough, the main shaft of the stirring motor is connected to a stirring shaft extending into the trough, and the bottom of the stirring shaft is provided with stirring blades.

[0016] Preferably, the exhaust gas treatment unit includes a scrubbing tower connected to the dust outlet of the primary drum screen, the gas phase outlet of the scrubbing tower being connected to the inlet of a gas-liquid separator, the gas phase outlet of the gas-liquid separator being connected to the inlet of an acid washing tower, the gas phase outlet of the acid washing tower being connected to the inlet of an alkaline washing tower, and the gas phase outlet of the alkaline washing tower being connected to an exhaust pipe.

[0017] The beneficial effects of this utility model are as follows:

[0018] 1. Compared with the traditional fine grinding process, the present invention addresses the problems of equipment blockage and uneven distribution of coal slurry particles that may occur during the grinding process of traditional fine grinding mills. The multi-stage crushing process of the present invention can optimize the particle size distribution of coal powder, making the coal particles entering the rod mill more rationally graded. This allows coal particles of different sizes to fill each other in the rod mill, reducing the gaps between particles and effectively improving the coal's stacking efficiency in water.

[0019] 2. In contrast to the shortcomings of excessive ineffective grinding in fine grinding mills, this utility model, by setting up a primary coal bunker, can not only supply raw materials to the rod mill, but also supply the secondary crushing unit with relatively uniform particle size, all of which are small coal powder; thus achieving the characteristics of reducing crushing load and improving crushing efficiency; that is, it can achieve precise control of the crushing process, thereby improving the stability and economy of the entire production system.

[0020] 3. This utility model can store two different particle sizes of coal powder for preparing coal-water slurry according to actual conditions. By setting up a weighing feeder, the concentration of coal-water slurry can be precisely controlled to meet the requirements of coal-water slurry in different production scenarios. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model.

[0023] Figure 2This is a structural schematic diagram of Embodiment 2 of the present invention.

[0024] In the diagram: 1. Raw coal shed; 2. Coal mill water tank; 3. Coal mill water pump; 4. Additive tank; 5. Additive pump; 6. First weighing feeder; 7. Second weighing feeder; 8. Medium-speed roller mill; 9. Fresh air duct; 10. Cyclone separator; 11. Circulating fan; 12. Rod mill; 13. Primary drum screen; 14. Discharge chute; 15. Primary coal slurry pump; 16. Secondary drum screen; 17. Coal-water slurry tank; 18. Secondary coal slurry pump; 19. Washing tower; 20. Gas-liquid separator; 21. Acid washing tower; 22. Alkali washing tower; 23. Coal-water slurry application section; 24. Agitator motor; 25. Agitator shaft; 26. Agitator blades; 27. Primary crusher; 28. Secondary crusher; 29. ​​Primary coal bunker; 30. Secondary coal bunker; 31. Cross screen; 32. Fine cross screen; 33. Drainage pipe. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0026] Example 1

[0027] like Figure 1As shown, a production system for increasing the concentration of coal-water slurry includes a raw coal shed 1 and a rod mill 12. The raw coal shed 1 is connected to a primary coal bunker 29 via a primary crushing unit. The primary coal bunker 29 is connected to the inlet of the rod mill 12 and a secondary crushing unit. The secondary crushing unit is connected to the inlet of the rod mill 12 via a secondary coal bunker 30. The inlet of the rod mill 12 is also connected to a coal grinding water tank 2 and an additive tank 4. The outlet of the rod mill 12 is connected to a primary drum screen 13. The dust outlet of the primary drum screen 13 is connected to a tail gas treatment unit. The coal-water slurry outlet of the primary drum screen 13 is connected to a coal-water slurry mixing and treatment unit. This invention employs a two-stage crushing method, resulting in two different particle sizes of coal powder in the raw coal processing section, enabling the preparation of coal-water slurries of varying concentrations. Furthermore, the coal powder particle size in the secondary coal bunker 30 is smaller than that in the primary coal bunker 29. In other words, the secondary crushing unit crushes the coal powder in the primary coal bunker 29. This crushing method reduces the crushing load on the secondary crushing unit, achieving energy saving and consumption reduction. The primary crushing unit includes a cross screen 31. The inlet of the cross screen 31 is connected to the raw coal shed 1, the undersize outlet of the cross screen 31 is connected to the primary coal bunker 29, the oversize outlet of the cross screen 31 is connected to the primary crusher 27, and the outlet of the primary crusher 27 is connected to the primary coal bunker 29. This invention uses a cross screen 31 to screen raw coal. This method allows coal powder that meets the particle size requirements of the primary coal bunker 29 to directly enter the primary coal bunker 29, while coal powder that does not meet the particle size requirements of the primary coal bunker 29 is crushed by the primary crusher 27. This method can maintain a relatively consistent particle size of coal powder in the primary coal bunker 29 while reducing the crushing load on the primary crusher 27, laying the foundation for subsequent coal-water slurry preparation and secondary crushing. The secondary crushing unit includes a fine cross screen 32 connected to the outlet of the primary coal bunker 29. The undersize outlet of the fine cross screen 32 is connected to the secondary coal bunker 30, and the oversize outlet of the fine cross screen 32 is connected to the secondary crusher 28. The outlet of the secondary crusher 28 is connected to the secondary coal bunker 30. It should be noted that the particle size of coal powder passing through the fine cross screen 32 is smaller than that passing through the cross screen 31. By using the fine cross screen 32 to screen the coal powder from the primary coal bunker 29, the processing load of the secondary crusher 28 can be reduced while ensuring that the particle size of the coal powder in the secondary coal bunker 30 remains basically consistent, thereby improving efficiency and reducing energy consumption. A first weighing feeder 6 is provided between the primary coal bunker 29 and the inlet of the rod mill 12, and a second weighing feeder 7 is provided between the secondary coal bunker 30 and the inlet of the rod mill 12. In actual use, different proportions of coal powder particle sizes are input into the rod mill 12 through the above-mentioned weighing feeders to achieve the characteristic of preparing coal-water slurry of different concentrations. A coal mill water pump 3 is provided between the coal mill water tank 2 and the inlet of the rod mill 12, and an additive pump 5 is provided between the additive tank 4 and the inlet of the rod mill 12.The coal-water slurry mixing and processing unit includes a discharge trough 14 connected to the coal-water slurry outlet of the primary drum screen 13. The outlet of the discharge trough 14 is connected to the coal-water slurry tank 17 via a primary coal slurry pump 15 and a secondary drum screen 16. The outlet of the coal-water slurry tank 17 is connected to the coal-water slurry usage section 23 via a secondary coal slurry pump 18. This configuration ensures the coal-water slurry is in a homogeneous state, laying the foundation for its subsequent use. The coal-water slurry usage section 23 can be a gasifier in a gasification system or a coal-water slurry boiler, etc. The discharge trough 14 and the coal-water slurry tank 17 are each equipped with a mixing section to ensure the material is in a homogeneous state. The mixing section includes a mixing motor 24 mounted on the top of the discharge trough 14 and the coal-water slurry tank 17. The main shaft of the mixing motor 24 is connected to a mixing shaft 25 extending into the tank. Mixing blades 26 are located at the bottom of the mixing shaft 25. The exhaust gas treatment unit includes a scrubbing tower 19 connected to the dust outlet of the primary drum screen 13. The gas phase outlet of the scrubbing tower 19 is connected to the inlet of the gas-liquid separator 20, the gas phase outlet of the gas-liquid separator 20 is connected to the inlet of the acid washing tower 21, the gas phase outlet of the acid washing tower 21 is connected to the inlet of the alkaline washing tower 22, and the gas phase outlet of the alkaline washing tower 22 is connected to the exhaust pipe 33. This configuration enables the treatment of exhaust gas generated during the grinding process, achieving emission standards and environmental friendliness.

[0028] The working principle of this embodiment is as follows: Raw coal in the raw coal shed 1 enters the cross screen 31 (this conveying can use conventional conveying equipment, such as belt conveyors, scraper conveyors, etc.) for screening; for example, if the coal powder particle size in the primary coal bunker 29 is less than 10mm, the raw coal is screened by the cross screen 31, and coal particles with a diameter less than 10mm directly enter the primary coal bunker 29, while those that fail the screening are sent to the primary crusher 27, that is, the raw coal that fails the screening enters the primary crusher 27 and is crushed into particles smaller than 10mm. Coal particles with a diameter of mm are fed into the primary coal bunker 29. A portion of the coal powder in the primary bunker 29 enters the rod mill 12 to prepare coal-water slurry, while the other portion enters the fine cross screen 32. For example, coal powder particles smaller than 5mm in diameter in the secondary coal bunker 30 are screened by the fine cross screen 32. Coal particles smaller than 5mm in diameter directly enter the secondary coal bunker 30. Those that fail the screening are sent to the secondary crusher 28 to be crushed into coal particles smaller than 5mm in diameter before being sent to the secondary coal bunker 30. The coal powder from the secondary coal bunker 30 is fed into the rod mill 12. The coal powder from the primary coal bunker 29 and the secondary coal bunker 30 is fed into the rod mill 12 in a specific ratio via their respective weighing feeders. Simultaneously, the pulverized coal from the pulverizing water tank 2 is pumped into the rod mill 12 via the pulverizing water pump 3, and the additives from the additive tank 4 are pumped into the rod mill 12 via the additive pump 5. The materials are mixed and ground in the rod mill 12 to produce a coal-water slurry, which then enters the primary drum screen. After screening in 13 (removing large particles), the slurry enters the discharge trough 14. Further, it is pumped by the primary coal slurry pump 15 to the secondary drum screen 16 for screening to remove more large particles before entering the coal-water slurry tank 17 for use in the subsequent coal-water slurry application section 23. During the flow of the coal-water slurry into the discharge trough 14 and the coal-water slurry tank 17, the stirring motor 24 remains running to ensure a homogeneous state (preventing coal powder sedimentation and ensuring the stability of the coal-water slurry during transportation), laying the foundation for subsequent separation and use. The exhaust gas generated in the rod mill 12 enters the washing tower 19 through the dust outlet of the primary drum screen 13. The gas phase then enters the gas-liquid separator 20 for gas-liquid separation. The separated gas phase passes through the acid washing tower 21 for acid washing, and then enters the alkali washing tower 22 for alkali washing. Finally, the gas phase is harmlessly discharged through the exhaust pipe 33, preventing environmental pollution.

[0029] Example 2

[0030] like Figure 2As shown, a production system for increasing the concentration of coal-water slurry includes a raw coal shed 1 and a rod mill 12. The raw coal shed 1 is connected to a primary coal bunker 29 via a primary crushing unit. The primary coal bunker 29 is connected to the inlet of the rod mill 12 and a secondary crushing unit. The secondary crushing unit is connected to the inlet of the rod mill 12 via a secondary coal bunker 30. The inlet of the rod mill 12 is also connected to a coal grinding water tank 2 and an additive tank 4. The outlet of the rod mill 12 is connected to a primary drum screen 13. The dust outlet of the primary drum screen 13 is connected to a tail gas treatment unit, and the coal-water slurry outlet of the primary drum screen 13 is connected to a coal-water slurry mixing and treatment unit. The primary crushing unit includes a cross screen 31. The inlet of the cross screen 31 is connected to the raw coal shed 1. The undersize outlet of the cross screen 31 is connected to the primary coal bunker 29, and the oversize outlet of the cross screen 31 is connected to a primary crusher 27. The outlet of the primary crusher 27 is connected to the primary coal bunker 29. The secondary crushing unit includes a medium-speed roller mill 8 connected to the outlet of the primary coal bunker 29. The outlet of the medium-speed roller mill 8 is connected to a cyclone separator 10, and the solid phase outlet of the cyclone separator 10 is connected to the secondary coal bunker 30. A portion of the coal powder in the primary coal bunker 29 can enter the medium-speed roller mill 8 for further crushing. After crushing, the powder enters the cyclone separator 10, where it is collected and sent to the secondary coal bunker 30. The gas phase outlet of the cyclone separator 10 is connected to the inlet of the medium-speed roller mill 8 via a gas phase pipe equipped with a circulating fan 11. A fresh air duct 9 with a valve is installed on the gas phase pipe between the gas phase outlet of the cyclone separator 10 and the circulating fan 11. This configuration allows for the recycling and reuse of dust generated during grinding, thereby reducing production costs. A first weighing feeder 6 is provided between the inlet of the primary coal bunker 29 and the rod mill 12, and a second weighing feeder 7 is provided between the inlet of the secondary coal bunker 30 and the rod mill 12. A coal mill water pump 3 is provided between the inlet of the coal mill water tank 2 and the rod mill 12, and an additive pump 5 is provided between the additive tank 4 and the rod mill 12. The coal-water slurry mixing and treatment unit includes a discharge trough 14 connected to the coal-water slurry outlet of the primary drum screen 13. The outlet of the discharge trough 14 is connected to the coal-water slurry tank 17 through the primary coal slurry pump 15 and the secondary drum screen 16. The outlet of the coal-water slurry tank 17 is connected to the coal-water slurry use section 23 through the secondary coal slurry pump 18. The discharge trough 14 and the coal-water slurry trough 17 are respectively provided with a stirring section for achieving a homogeneous state of the material; the stirring section includes a stirring motor 24 provided at the top of the discharge trough 14 and the coal-water slurry trough 17, the main shaft of the stirring motor 24 is connected to a stirring shaft 25 extending into the trough, and the bottom of the stirring shaft 25 is provided with stirring blades 26.The exhaust gas treatment unit includes a scrubbing tower 19 connected to the dust outlet of the primary drum screen 13. The gas phase outlet of the scrubbing tower 19 is connected to the inlet of the gas-liquid separator 20. The gas phase outlet of the gas-liquid separator 20 is connected to the inlet of the acid washing tower 21. The gas phase outlet of the acid washing tower 21 is connected to the inlet of the alkaline washing tower 22. The gas phase outlet of the alkaline washing tower 22 is connected to the exhaust pipe 33.

[0031] The working principle of this embodiment is as follows: Raw coal in the raw coal shed 1 enters the cross screen 31 for screening (this conveying can use conventional conveying equipment, such as belt conveyors, scraper conveyors, etc.); for example, the coal powder particle size in the primary coal silo 29 is less than 10mm. After screening by the cross screen 31, coal particles with a diameter less than 10mm directly enter the primary coal silo 29, and those that fail screening are sent to the primary crusher 27. That is, the raw coal that fails screening is crushed into coal particles with a diameter less than 10mm in the primary crusher 27 and then sent to the primary coal silo 29; part of the coal powder in the primary coal silo 29 enters the rod mill 12 to prepare coal-water slurry, and the other part enters the medium-speed roller mill 8 for grinding. For example, it can be ground to a coal powder particle size of less than 5mm according to the actual situation. The coal powder particles are separated by the cyclone separator 10 and enter the secondary coal silo 30. The airflow is sent back to the medium-speed roller mill 8 by the circulating fan 11. At the same time, fresh air is introduced into the system through the fresh air duct 9; the secondary coal... The pulverized coal in bin 30 is fed into rod mill 12. The pulverized coal in the primary coal bin 29 and the secondary coal bin 30 are fed into rod mill 12 in a certain proportion through their respective weighing feeders. At the same time, the pulverized coal water in the pulverizing water tank 2 is fed into rod mill 12 through pulverizing water pump 3, and the additives in the additive tank 4 are fed into rod mill 12 through additive pump 5. The above materials are mixed and ground in rod mill 12 to make coal-water slurry. The coal-water slurry is screened in primary drum screen 13 (to remove large particles) and then enters discharge tank 14. Further, it is sent to secondary drum screen 16 by primary coal slurry pump 15 to screen and remove large particles before entering coal-water slurry tank 17 for use in subsequent coal-water slurry use section 23. When the coal-water slurry enters discharge tank 14 and coal-water slurry tank 17, the stirring motor 24 is always running to keep the coal-water slurry in a homogeneous state (to prevent coal powder particles from settling and to ensure the stability of the coal-water slurry during transportation), laying the foundation for subsequent separation and use. The exhaust gas generated in the rod mill 12 enters the washing tower 19 through the dust outlet of the primary drum screen 13 and is then washed. The gas phase then enters the gas-liquid separator 20 for gas-liquid separation. The gas phase after gas-liquid separation passes through the acid washing tower 21 for acid washing. The acid-washed gas phase then enters the alkaline washing tower 22 for alkaline washing. Finally, the gas phase is harmlessly discharged through the exhaust pipe 33 to prevent it from causing pollution to the environment.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A production system for increasing the concentration of coal-water slurry, the production system comprising a raw coal shed (1) and a rod mill (12), characterized in that: The raw material coal shed (1) is connected to the primary coal bunker (29) through the primary crushing unit. The primary coal bunker (29) is connected to the inlet of the rod mill (12) and the secondary crushing unit respectively. The secondary crushing unit is connected to the inlet of the rod mill (12) through the secondary coal bunker (30). The inlet of the rod mill (12) is also connected to the coal grinding water tank (2) and the additive tank (4). The outlet of the rod mill (12) is connected to the primary drum screen (13), the dust outlet of the primary drum screen (13) is connected to the exhaust gas treatment unit, and the water-coal slurry outlet of the primary drum screen (13) is connected to the water-coal slurry mixing and treatment unit.

2. The production system for increasing the concentration of coal-water slurry according to claim 1, characterized in that: The primary crushing unit includes a cross screen (31), the inlet of which is connected to the raw material coal shed (1), the undersize outlet of which is connected to the primary coal bunker (29), the oversize outlet of which is connected to the primary crusher (27), and the outlet of which is connected to the primary coal bunker (29).

3. The production system for increasing the concentration of coal-water slurry according to claim 2, characterized in that: The secondary crushing unit includes a fine cross screen (32) connected to the outlet of the primary coal bunker (29). The undersize outlet of the fine cross screen (32) is connected to the secondary coal bunker (30), the oversize outlet of the fine cross screen (32) is connected to the secondary crusher (28), and the outlet of the secondary crusher (28) is connected to the secondary coal bunker (30).

4. The production system for increasing the concentration of coal-water slurry according to claim 2, characterized in that: The secondary crushing unit includes a medium-speed roller mill (8) connected to the outlet of the primary coal bunker (29). The outlet of the medium-speed roller mill (8) is connected to a cyclone separator (10), and the solid phase outlet of the cyclone separator (10) is connected to the secondary coal bunker (30).

5. A production system for increasing the concentration of coal-water slurry according to claim 4, characterized in that: The gas phase outlet of the cyclone separator (10) is connected to the inlet of the medium-speed roller mill (8) through a gas phase pipe with a circulating fan (11). A fresh air pipe (9) with a valve is provided on the gas phase pipe between the gas phase outlet of the cyclone separator (10) and the circulating fan (11).

6. A production system for increasing the concentration of coal-water slurry according to claim 3 or 4, characterized in that: A first weighing feeder (6) is provided between the inlet of the primary coal bunker (29) and the inlet of the rod mill (12), and a second weighing feeder (7) is provided between the inlet of the secondary coal bunker (30) and the inlet of the rod mill (12).

7. A production system for increasing the concentration of coal-water slurry according to claim 1, characterized in that: A coal grinding water pump (3) is provided between the inlet of the coal grinding water tank (2) and the inlet of the rod mill (12), and an additive pump (5) is provided between the additive tank (4) and the inlet of the rod mill (12).

8. A production system for increasing the concentration of coal-water slurry according to claim 1, characterized in that: The coal-water slurry mixing and processing unit includes a discharge trough (14) connected to the coal-water slurry outlet of the primary drum screen (13). The outlet of the discharge trough (14) is connected to the coal-water slurry tank (17) via a primary coal slurry pump (15) and a secondary drum screen (16). The outlet of the coal-water slurry tank (17) is connected to the coal-water slurry usage section (23) via a secondary coal slurry pump (18).

9. A production system for increasing the concentration of coal-water slurry according to claim 8, characterized in that: The discharge trough (14) and the coal-water slurry trough (17) are respectively equipped with stirring sections for achieving a homogeneous state of materials; The mixing unit includes a mixing motor (24) installed at the top of the discharge trough (14) and the coal-water slurry trough (17). The main shaft of the mixing motor (24) is connected to a mixing shaft (25) extending into the trough. The bottom of the mixing shaft (25) is provided with mixing blades (26).

10. A production system for increasing the concentration of coal-water slurry according to claim 1, characterized in that: The exhaust gas treatment unit includes a scrubbing tower (19) connected to the dust outlet of the primary drum screen (13). The gas phase outlet of the scrubbing tower (19) is connected to the inlet of the gas-liquid separator (20). The gas phase outlet of the gas-liquid separator (20) is connected to the inlet of the acid washing tower (21). The gas phase outlet of the acid washing tower (21) is connected to the inlet of the alkaline washing tower (22). The gas phase outlet of the alkaline washing tower (22) is connected to the exhaust pipe (33).

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