Coal mill for preparing coal slurry
By using air selection and filter technology in the coal mill, the problem of uneven coarse and fine coal particles in the water coal slurry is solved, and the uniformity of the coal powder particle size and the quality of water coal slurry are improved, ensuring the synthesis of ammonia Stability and efficiency.
Patent Information
- Application Number
- CN202421005299.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-10
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-05-10
AI Technical Summary
The coarse and fineness of coal particles in the water coal slurry output by existing coal mills affects the carbon conversion rate and product quality of the synthesis ammonia process.
A coal grinder for coal slurry preparation is designed, using air selection method to mix coal particles below the threshold mass with water and additives, and block larger coal particles through the filter between the air conduit and the coal grinding cylinder to ensure that Coal powder particle size uniformity.
The mixture of coal particles within a certain mass range is achieved, the ratio of water and additives is controlled, the quality and stability of water coal slurry is improved, the strong exhaust fan is protected, and the uniformity of the particle size of the coal powder is ensured.
Smart Images
Figure CN222266941U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of coal slurry preparation, in particular to a coal mill for coal slurry preparation. Background Art
[0002] Water-coal slurry is the main raw material for the synthetic ammonia process. The quality of water-coal slurry is particularly important for the cost control of the synthetic ammonia process. Improving the quality of water-coal slurry is becoming increasingly important in industrial production. In the coal slurry preparation process, the raw coal is screened and crushed at the raw material storage position and then conveyed to the feed port of the coal mill by belt. It is then fully ground and compacted in the coal mill with appropriate amount of water and additives, and then passes through the coal mill discharge port. After the coarse and fine particles are separated by the first-level drum screen, it enters the coal mill discharge trough and is pumped to the gasifier by coal slurry.
[0003] Existing coal mills usually directly add coal, water and additives into the coal mill for blending and grinding. Therefore, the coal particles in the output water-coal slurry are always mixed with water and additives of uneven size. The serious unevenness of coal particles will make it difficult to ensure the quality of the mixed coal slurry, affect the final carbon conversion rate of the gasifier and further affect the use effect, such as the output of synthetic ammonia. Utility Model Content
[0004] In view of the deficiencies of the prior art, the utility model provides a coal pulverizer for preparing coal slurry to solve the problem mentioned in the background art that the coal particles in the water-coal slurry output by the existing coal pulverizer are always unevenly coarse and fine and mixed with water and additives.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a coal mill for preparing coal slurry, comprising a coal mill barrel, the interior of the coal mill barrel is fixedly connected with a feed pipe, an auger body is rotatably arranged inside the coal mill barrel, a first motor that drives the auger body to rotate is fixedly installed on the right outer wall of the coal mill barrel, an air duct is fixedly connected inside the coal mill barrel, and the end of the air duct away from the coal mill barrel is connected to the input end of a powerful exhaust fan through a discharge pipe; the output end of the powerful exhaust fan is connected to a mixing barrel and is provided with a flow sensor; a second motor is fixedly installed on the right outer wall of the mixing barrel at a position corresponding to the coal mill barrel; a grinding disc is fixedly installed on the rotating output shaft of the second motor, and the grinding disc is located inside the coal mill barrel near the air duct and is sealed and connected to the coal mill barrel;
[0006] A triangular plate is fixedly installed inside the coal grinding cylinder; the output end of the second motor is rotatably connected to a side of the triangular plate away from the first motor; the auger body is rotatably connected to the other side of the triangular plate;
[0007] The mixing barrel is rotatably connected with a stirring rod, and two connecting rods are fixedly installed on the top outer wall of the mixing barrel. Liquid pumps are fixedly installed on the outer walls of the two connecting rods. The two liquid pumps respectively input water and additives into the mixing barrel through corresponding liquid inlet pipes;
[0008] A third motor for driving the stirring rod to rotate is fixedly mounted on the top outer wall of the mixing barrel.
[0009] Furthermore, the bottom of the mixing cylinder is fixedly connected to a diaphragm pump, and the outer wall of the mixing cylinder is provided with an observation window.
[0010] Furthermore, the grinding disc is provided with a grinding disc mechanism fixed to the rotating output shaft of the second motor, and an outer edge fixing disc rotatably connected to the grinding disc; the outer wall of the outer edge fixing disc is detachably fixedly connected to the inner wall of the coal grinding cylinder.
[0011] Furthermore, the outer edge of the grinding disc is connected to the coal grinding cylinder in a plug-in manner, and a rubber sealing ring is provided on the inner wall of the coal grinding cylinder at the connection.
[0012] Furthermore, a filter is provided at the connection between the air guide pipe and the coal grinding cylinder.
[0013] Furthermore, the bottom of the mixing barrel is arranged in an arc shape and is provided with a control valve.
[0014] Furthermore, the first motor and the second motor rotate in opposite directions.
[0015] Compared with the prior art, the beneficial effects of the utility model are:
[0016] 1. The utility model uses air selection to suck coal particles with a mass below a threshold into a mixing barrel for mixing with water and additives. During mixing, water and additives enter the mixing barrel through pipelines respectively, so that on the one hand, the coal particles during mixing are always within a certain mass range, that is, a certain particle size range, and on the other hand, effective control of the mixing ratio of water and additives is achieved, so that the output water-coal slurry has better quality.
[0017] 2. The coal pulverizer for preparing coal slurry can block larger granular coal through the filter between the air guide pipe and the coal pulverizer cylinder, so as to limit the larger coal from entering the mixing cylinder. On the one hand, it can protect the powerful exhaust fan, and on the other hand, it can make the particle size of the coal powder input into the mixing cylinder more uniform, thereby further improving the quality of the coal slurry. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a three-dimensional schematic diagram of the structure of the utility model;
[0019] Figure 2 This is a schematic diagram of the front view of the structure of the utility model;
[0020] Figure 3 The utility model structure Figure 2 Enlarged schematic diagram at point A in the middle.
[0021] In the figure: 1. Coal grinding cylinder; 2. Feeding pipe; 3. First motor; 4. Auger body; 5. Air guide pipe; 6. Powerful exhaust fan; 7. Mixing cylinder; 8. Second motor; 9. Grinding disc; 10. Triangular plate; 11. Stirring rod; 12. Connecting rod; 13. Liquid inlet pipe; 14. Liquid pump; 15. Diaphragm pump; 16. Observation window; 17. Third motor. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0023] Example:
[0024] A coal mill for preparing coal slurry, such as Figure 1-2 As shown, it includes a coal milling cylinder 1, wherein the interior of the coal milling cylinder 1 is fixedly connected with a feed pipe 2, an auger body 4 is rotatably arranged inside the coal milling cylinder 1, a first motor 3 which drives the auger body 4 to rotate is fixedly installed on the right outer wall of the coal milling cylinder 1, an air duct 5 is fixedly connected inside the coal milling cylinder 1, and one end of the air duct 5 away from the coal milling cylinder 1 is connected to the input end of a powerful exhaust fan 6 through a discharge pipe; the output end of the powerful exhaust fan 6 is connected to a mixing cylinder 7 and is provided with a flow sensor; a second motor 8 is fixedly installed on the right outer wall of the mixing cylinder 7 at a position corresponding to the coal milling cylinder 1; a grinding disc 9 is fixedly installed on the rotating output shaft of the second motor 8, and the grinding disc 9 is located inside the coal milling cylinder 1 near the air duct 5 and is sealed and connected to the coal milling cylinder 1;
[0025] A triangular plate 10 is fixedly installed inside the coal grinding cylinder 1; the output end of the second motor 8 is rotatably connected to the side of the triangular plate 10 away from the first motor 3; the auger body 4 is rotatably connected to the other side of the triangular plate 10;
[0026] The mixing barrel 7 is rotatably connected with a stirring rod 11, and two connecting rods 12 are fixedly installed on the top outer wall of the mixing barrel 7. Liquid pumps 14 are fixedly installed on the outer walls of the two connecting rods 12. The two liquid pumps 14 respectively input water and additives into the mixing barrel 7 through corresponding liquid inlet pipes 13;
[0027] A third motor 17 is fixedly mounted on the top outer wall of the mixing barrel 7 to drive the stirring rod 11 to rotate.
[0028] When it is necessary to produce coal slurry and grind coal, first, the coal is fed into the coal mill barrel 1 through the feed pipe 2. At this time, the first motor 3 will drive the auger body 4 to rotate, and the auger body 4 will drive the coal to move to the left. The auger body 4 and the coal mill barrel 1 can cooperate to achieve the effect of extrusion, crushing and transferring coal to the left, and the coal can be squeezed onto the grinding disc 9. The second motor 8 drives the grinding disc 9 to rotate, and the grinding disc 9 will grind the coal. Then the smaller granular coal powder produced by the grinding disc 9 will be sucked by the powerful exhaust fan 6 through the air duct 5 and transported to the inside of the mixing barrel 7. The flow sensor is used to record the coal powder entering the mixing barrel 7. The two liquid pumps 14 are controlled as needed, and water and additives are input into the mixing barrel 7 according to the mass ratio with the coal powder. Finally, the third motor 17 is turned on, and the third motor 17 will drive the stirring rod 11 to rotate to mix the coal powder, water and additives.
[0029] The coal powder input into the mixing barrel 7 of the utility model is selected by the powerful exhaust fan 6, so that only the coal particles with a mass lower than the preset mass (corresponding to a certain range of particle size) can enter the mixing barrel 7 to participate in the mixing process of the water-coal slurry. Therefore, the coal particles in the produced water-coal slurry are more uniform than those in the prior art, and the quality and stability of the slurry are better.
[0030] Example 2
[0031] On the basis of Example 1, the bottom of the mixing cylinder 7 is fixedly connected to a diaphragm pump 15 , and the outer wall of the mixing cylinder 7 is provided with an observation window 16 .
[0032] Specifically, a diaphragm pump 15 is provided at the bottom of the mixing barrel 7 to achieve a better effect of transmitting the coal slurry, and an observation window 16 provided on the outer wall of the mixing barrel 7 can be used to observe the mixing situation inside the mixing barrel 7;
[0033] Example 3
[0034] On the basis of Example 1, the grinding disc 9 is provided with a grinding disc mechanism fixed to the rotating output shaft of the second motor 8, and an outer edge fixed disc rotatably connected to the grinding disc. The outer edge disc surface of the grinding disc 9 is plug-in connected to the coal grinding cylinder 1, and a rubber sealing ring is provided on the inner wall of the coal grinding cylinder 1 at the connection.
[0035] Specifically, the outer edge fixed disk is detachably fixedly connected to the coal grinding cylinder 1, which can achieve the effect of stably rotating the grinding disk 9. The setting of the rubber sealing ring can play a sealing role to prevent the ground coal powder from leaking out.
[0036] Example 4
[0037] On the basis of Example 1, the outer wall of the auger body 4 is rotatably connected to the inside of the triangular plate 10, and the output end of the first motor 3 is fixedly connected to the axis of the auger body 4;
[0038] Specifically, the auger body 4 is rotatably connected to the triangular plate 10 to achieve the effect of stably rotating the auger body 4 , and the first motor 3 is connected to the auger body 4 to achieve the effect of driving the auger body 4 to rotate.
[0039] Example 5
[0040] On the basis of Example 1, a filter screen is provided at the connection between the air guide pipe 5 and the coal grinding cylinder 1 .
[0041] Specifically, a filter is designed between the air duct 5 and the coal grinding cylinder 1 to block larger granular coal, thereby limiting the entry of larger coal into the mixing cylinder 7. It can protect the powerful exhaust fan 6 and make the coal powder input into the mixing cylinder 7 finer, thereby improving the quality of the coal slurry.
[0042] Example 6
[0043] On the basis of Example 1, a stabilizing rod is fixedly installed inside the grinding disc 9 , and the outer wall of the stabilizing rod is rotatably connected to the inside of the triangular plate 10 .
[0044] Specifically, the stabilizing rod disposed inside the grinding disc 9 can stabilize the rotation of the grinding disc 9, and the stabilizing rod and the triangular plate 10 are used to stabilize the structure;
[0045] Example 7
[0046] On the basis of Example 1, the interior of the mixing barrel 7 is fixedly connected to the outer walls of the two liquid inlet pipes 13, and the output end of the third motor 17 is fixedly connected to the axis of the stirring rod 11;
[0047] Specifically, the mixing barrel 7 is connected with the two liquid inlet pipes 13 to facilitate the input of water and additives. The two liquid inlet pipes 13 can classify water and additives and input them into the mixing barrel 7. The third motor 17 is connected with the stirring rod 11 to achieve the effect of driving the stirring rod 11 to rotate.
[0048] Example 8
[0049] On the basis of Example 1, the bottom of the mixing barrel 7 is arranged in an arc shape, and a control valve is arranged at the bottom of the mixing barrel 7
[0050] Specifically, the bottom of the mixing barrel 7 is arranged in an arc shape to achieve the effect of collecting and converging the mixed materials, and the control valve arranged at the bottom of the mixing barrel 7 can control the discharge of the mixing barrel 7.
[0051] Example 9
[0052] Based on the first embodiment, the first motor 3 and the second motor 8 rotate in opposite directions.
[0053] Specifically, the first motor 3 and the second motor 8 rotate in opposite directions, so that the coal in the coal grinding drum 1 is subjected to opposite forces, thereby achieving a faster and more efficient grinding effect.
[0054] In the embodiment of the utility model: the first motor 3, the powerful exhaust fan 6, the second motor 8, the third motor 17, the liquid pump 14 and the diaphragm pump 15 are existing structures, and the control circuit can be realized by simple programming by technicians in this field. It belongs to the common knowledge in the field and is only used without modification. Therefore, the control method and circuit connection are not described in detail.
[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A coal mill for preparing coal slurry, comprising a coal mill cylinder (1), characterized in that: The coal mill cylinder (1) is fixedly connected to a feed pipe (2), a screw main body (4) is rotatably arranged inside the coal mill cylinder (1), a first motor (3) for driving the screw main body (4) to rotate is fixedly installed on the right outer wall of the coal mill cylinder (1), an air guide pipe (5) is fixedly connected to the inside of the coal mill cylinder (1), and the end of the air guide pipe (5) away from the coal mill cylinder (1) is connected to the input end of a powerful exhaust fan (6) through a discharge pipe; the output end of the powerful exhaust fan (6) is connected to a mixing cylinder (7) and is provided with a flow sensor; a second motor (8) is fixedly installed on the right outer wall of the mixing cylinder (7) at a position corresponding to the coal mill cylinder (1); a grinding disc (9) is fixedly installed on the rotating output shaft of the second motor (8), and the grinding disc (9) is located inside the coal mill cylinder (1) near the air guide pipe (5) and is sealed and connected to the coal mill cylinder (1); A triangular plate (10) is fixedly installed inside the coal grinding cylinder (1); the output end of the second motor (8) is rotatably connected to a side of the triangular plate (10) away from the first motor (3); the auger body (4) is rotatably connected to the other side of the triangular plate (10); The mixing barrel (7) is rotatably connected to a stirring rod (11), and two connecting rods (12) are fixedly mounted on the top outer wall of the mixing barrel (7). Liquid pumps (14) are fixedly mounted on the outer walls of the two connecting rods (12). The two liquid pumps (14) respectively input water and additives into the mixing barrel (7) through corresponding liquid inlet pipes (13); A third motor (17) for driving the stirring rod (11) to rotate is fixedly mounted on the top outer wall of the mixing barrel (7).
2. A coal mill for preparing coal slurry according to claim 1, characterized in that: The bottom of the mixing cylinder (7) is fixedly connected to a diaphragm pump (15), and the outer wall of the mixing cylinder (7) is provided with an observation window (16).
3. A coal mill for preparing coal slurry according to claim 1, characterized in that: The grinding disc (9) is provided with a grinding disc mechanism fixed to the rotating output shaft of the second motor (8), and an outer edge fixing disc rotatably connected to the grinding disc; the outer wall of the outer edge fixing disc is detachably fixedly connected to the inner wall of the coal grinding cylinder (1).
4. A coal mill for preparing coal slurry according to claim 3, characterized in that: The outer edge of the grinding disc (9) is connected to the coal grinding cylinder (1) in a plug-in manner, and a rubber sealing ring is provided on the inner wall of the coal grinding cylinder (1) at the connection point.
5. A coal mill for preparing coal slurry according to claim 1, characterized in that: A filter screen is provided at the connection between the air guide pipe (5) and the coal grinding cylinder (1).
6. A coal mill for preparing coal slurry according to claim 1, characterized in that: The bottom of the mixing cylinder (7) is arranged in an arc shape and is provided with a control valve.
7. A coal mill for preparing coal slurry according to claim 1, characterized in that: The first motor (3) and the second motor (8) rotate in opposite directions.