Coal mill for thermal power generation

Abstract

The invention provides a coal mill for thermal power generation, which is used for solving the problem that the size of coal is not distinguished when the coal is milled, and comprises a milling mechanism arranged in a milling cylinder, and the milling mechanism is used for milling coal briquettes in the milling cylinder; the screening mechanism is arranged on the grinding cylinder and comprises a feeding hole, a first discharging hole and a second discharging hole; the first discharge port is connected with the grinding cylinder, the grinding cylinder further comprises a third discharge port, and the second discharge port is connected with the third discharge port; the screening mechanism is used for conveying coal briquettes in the coal into the grinding cylinder through the first discharging opening; the screening mechanism is further used for conveying coal particles in the coal into the third discharging opening through the second discharging opening. The screening mechanism is arranged on the coal mill, fine particles in coal are screened out before entering the coal mill, the burden of the milling mechanism is reduced, in addition, the second discharging port of the screening mechanism is connected with the third discharging port of the powdered ink barrel, the fine particles of the coal are conveyed out through one discharging port, and collection is convenient.

Description

Technical Field

[0001] The invention belongs to the field of thermal power generation, and in particular relates to a coal mill for thermal power generation. Background Art

[0002] Electricity is an energy source that uses electrical energy as a driving force. Thermal power generation is the main method of producing electrical energy in my country. When generating electricity, by utilizing the heat energy generated by the combustion of combustibles in the boiler, there are three types of energy conversion processes in thermal power generation: fuel chemical energy-steam thermal energy-mechanical energy-electrical energy. Simply put, it uses the heat of fuel to heat water to form high-temperature and high-pressure superheated steam, and then the steam enters the steam turbine along the pipeline and continues to expand and do work, impacting the turbine rotor to rotate at high speed, driving the generator rotor (electromagnetic field) to rotate, and the stator coil cuts the magnetic lines of force to generate electrical energy, and then uses the step-up transformer to increase the voltage to the system voltage, connect to the system grid, and transmit electrical energy to the outside.

[0003] Coal is usually used in thermal power generation. When the coal is transported from the coal plant to the thermal power station, the size of the coal is uneven, and most of it is coal lumps. It is difficult for the coal lumps to burn fully in the boiler. Therefore, before putting the coal into the boiler, the coal needs to be ground, that is, the coal lumps are ground into smaller coal particles for full combustion.

[0004] When the existing coal mill is in use, all coals of different sizes are uniformly put into the coal mill for grinding. After grinding, the coal enters the next process or is directly transferred to the boiler through the coal outlet at the bottom of the coal mill. However, although this method can grind the coal into smaller particles, the coal transported from the coal plant contains not only coal lumps but also particles that can be burned without grinding. If the whole coal is put into the grinder, it will increase the burden on the coal mill on the one hand and reduce the efficiency of thermal power generation on the other. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a coal mill for thermal power generation, which is used to solve the problem in the prior art that the size of coal is not distinguished when grinding coal.

[0006] To achieve the above-mentioned purpose and other related purposes, the present invention provides a coal mill for thermal power generation, which includes: a grinding cylinder, a grinding mechanism and a screening mechanism; the grinding mechanism is arranged in the grinding cylinder, and the grinding mechanism is used to grind the coal blocks in the grinding cylinder; the screening mechanism is arranged on the grinding cylinder, and includes a feed port, a first discharge port and a second discharge port; the first discharge port is connected to the grinding cylinder, and the grinding cylinder also includes a third discharge port, and the second discharge port is connected to the third discharge port; the screening mechanism is used to transfer the coal blocks in the coal to the grinding cylinder through the first discharge port; the screening mechanism is also used to transfer the coal particles in the coal to the third discharge port through the second discharge port.

[0007] Optionally, the screening mechanism comprises a screen; the screen is arranged at the bottom of the feed inlet, and the angle formed by a straight line perpendicular to the screen and the central axis of the grinding cylinder is an acute angle.

[0008] Optionally, the grinding cylinder further comprises a disturbance mechanism; the disturbance mechanism is used to disturb the coal blocks in the grinding cylinder.

[0009] Optionally, the disturbance mechanism includes a driving member, a transmission member and a disturbance member; the driving member is arranged outside the grinding cylinder; the disturbance member is arranged inside the grinding cylinder, and the driving member drives the disturbance member to move through the transmission member.

[0010] Optionally, the disturbance member is rotatably connected to the inner wall of the grinding cylinder.

[0011] Optionally, a connecting member is provided on the disturbance member, a through hole is provided on the connecting member, a rotating shaft is provided on the transmission member, and the transmission member is connected to the through hole via the rotating shaft.

[0012] Optionally, a blocking member is further provided in the grinding cylinder, and the connecting end between the disturbance member and the grinding cylinder is arranged within the angle formed by the blocking member and the inner side wall of the grinding cylinder.

[0013] Optionally, the coal mill also includes a base and a sprinkler mechanism, the sprinkler mechanism includes a water tank, a water pump and a water inlet pipe; the water tank is arranged on the base, one end of the water pump is connected to the water tank, and the other end is connected to the water inlet pipe; the water inlet pipe is arranged in the grinding cylinder; the water pump is used to spray the water in the water tank onto the coal blocks in the grinding cylinder through the water inlet pipe.

[0014] Optionally, the watering mechanism includes a plurality of spray heads, which are symmetrically arranged on the inner wall of the grinding cylinder.

[0015] Optionally, the grinding mechanism includes a grinding head, the grinding head is provided with a plurality of water spray holes, and the water inlet pipe is connected to the water spray holes.

[0016] As described above, a coal mill for thermal power generation according to the present invention has at least the following beneficial effects: the present invention provides a screening mechanism on the coal mill to screen out fine particles in the coal before entering the coal mill, thereby reducing the burden of the grinding mechanism; in addition, the second discharge port of the screening mechanism is connected to the third discharge port of the toner cartridge, so that the fine particles of the coal are transmitted out through one discharge port for easy collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a schematic structural diagram of the coal mill of the present invention.

[0018] Figure 2 Shown is a schematic top view of a coal mill according to the present invention.

[0019] Figure 3 Display as Figure 2 Sectional view taken along AA. DETAILED DESCRIPTION

[0020] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0021] Please refer to all the following drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0022] The following embodiments are only for illustration purposes and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0023] See also Figure 1-3 The present invention provides a coal mill for thermal power generation, which includes a grinding cylinder 1, a grinding mechanism 2 and a screening mechanism 3; the grinding mechanism 2 is arranged in the grinding cylinder 1, and is used to grind the coal blocks in the grinding cylinder 1; the screening mechanism 3 is arranged on the grinding cylinder 1, and includes a feed port 31, a first discharge port 32 and a second discharge port 33; the first discharge port 32 is connected to the grinding cylinder 1, and the grinding cylinder 1 also includes a third discharge port 11, and the second discharge port 33 is connected to the third discharge port 11; the screening mechanism 3 is used to transfer the coal blocks in the coal to the grinding cylinder 1 through the first discharge port 32; the screening mechanism 3 is also used to transfer the coal particles in the coal to the third discharge port 11 through the second discharge port 33. It can be understood that after the grinding mechanism 2 grinds the coal blocks into fine particles, the coal particles are automatically transferred out of the grinding cylinder 1 through the third discharge port 11 due to gravity. After screening the coal, the screening mechanism 3 transfers the coal particles to the third discharge port 11 through the second discharge port 33, that is, the coal particles are all transferred out through the same discharge port, which is convenient for collecting the coal particles or transferring them to the boiler for combustion using a conveying mechanism.

[0024] The screening mechanism 3 includes a screen 34, which is arranged at the bottom of the feed port 31. The angle formed by the straight line perpendicular to the screen 34 and the central axis of the grinding cylinder 1 is an acute angle. The screen 34 can be a filter plate with multiple holes. When the coal enters the screening mechanism 3 through the feed port 31, the screen 34 automatically separates the coal lumps and particles in the coal, that is, the fine particles pass through the screen 34 and enter the second discharge port 33. Since the coal lumps cannot pass through the screening holes, they enter the grinding cylinder 1. The angle formed by the straight line perpendicular to the screen 34 and the central axis of the grinding cylinder 1 is an acute angle, that is, the screen 34 and the grinding cylinder 1 are arranged obliquely so that the coal lumps can enter the grinding cylinder 1 by gravity.

[0025] The milling cylinder 1 also includes a disturbance mechanism 12, which is used to disturb the coal blocks in the milling cylinder 1. When the milling mechanism 2 grinds the coal blocks in the milling cylinder 1, since the milling mechanism 2 usually presses tightly against the coal blocks and then grinds the coal through the grinding head 21, after grinding for a period of time, due to the gravity or pressing force of the milling mechanism 2, the coal is piled up, which is not convenient for the milling mechanism 2 to grind. Therefore, the coal is disturbed by the disturbance mechanism 12, that is, the coal is driven to move so that the coal is no longer tightly piled together. Specifically, the disturbance mechanism 12 includes a driving member 121, a transmission member 122 and a disturbance member 123, the driving member 121 is arranged outside the milling cylinder 1, the disturbance member 123 is arranged inside the milling cylinder 1, and the driving member 121 drives the disturbance member 123 to move through the transmission member 122. In a specific implementation, a through hole for the transmission member 122 to pass through may be provided on the grinding cylinder 1, and a linear bearing may be provided in the through hole to facilitate the transmission member 122 to slide in the through hole. The driving member 121 may be a motor or a cylinder. When the driving member 121 is a motor, the transmission member 122 may be a screw. Preferably, the driving member 121 is a cylinder, which can withstand a large force, so as to disturb the accumulated coal.

[0026] The disturbance member 123 is rotatably connected to the inner wall of the grinding cylinder 1. In a specific implementation, the connection end between the transmission member 122 and the disturbance member 123 is away from the connection end between the disturbance member 123 and the inner wall of the grinding cylinder 1, so that the transmission member 122 can drive the disturbance member 123 to rotate.

[0027] The disturbance member 123 is provided with a connecting member 1231 , and the connecting member 1231 is provided with a through hole, which may be a waist-shaped hole. The transmission member 122 is provided with a rotating shaft 1221 , and the transmission member 122 is connected to the through hole via the rotating shaft 1221 .

[0028] A blocking member 13 is also provided in the milling cylinder 1, and the connection end of the disturbance member 123 and the milling cylinder is arranged within the angle formed by the blocking member 13 and the inner side wall of the milling cylinder 1. Since there are coal lumps and fine coal particles in the milling cylinder 1, the blocking member 13 is provided, and the connection end of the disturbance member 123 and the milling cylinder is arranged within the angle formed by the blocking member 13 and the inner side wall of the milling cylinder 1, so as to prevent the coal particles from entering the disturbance member 123 and the rotating end of the milling cylinder 1 and affecting the rotation of the disturbance member 123.

[0029] The coal mill also includes a base 4 and a water sprinkling mechanism 5, the water sprinkling mechanism 5 includes a water tank 51, a water pump 52 and a water inlet pipe 53; the water tank 51 is arranged on the base 4, one end of the water pump 52 is connected to the water tank 51, and the other end is connected to the water inlet pipe 53; the water inlet pipe 53 is arranged in the mill tube 1; the water pump 52 is used to spray the water in the water tank 51 onto the coal blocks in the mill tube 1 through the water inlet pipe 53. Since the coal mill grinds the coal into fine particles, when the particles are transmitted through the third discharge port 11, they are easily affected by the wind, causing the coal particles to be scattered in the air with the wind, so a water sprinkling mechanism 5 is provided to absorb the coal particles through water to prevent the coal from being scattered in the air. In addition, after absorbing water, the coal particles can also play a role in combustion. Specifically, the water sprinkling mechanism 5 includes a plurality of nozzles, which are symmetrically arranged on the inner wall of the mill tube 1. In another embodiment, a plurality of water spray holes 212 are provided on the grinding head 21, and the water inlet pipe 53 is connected to the water spray holes 212. That is, the water inlet pipe 53 sprays water on the coal through the water spray holes 212.

[0030] In summary, the present invention screens out fine particles in the coal before entering the coal mill by setting a screening mechanism 3 on the coal mill, thereby reducing the burden on the grinding mechanism 2. In addition, the second discharge port 33 of the screening mechanism 3 is connected to the third discharge port 11 of the toner cartridge, so that all fine particles of the coal are transmitted out through one discharge port for easy collection. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0031] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A coal mill for thermal power generation, characterized in that: The coal mill comprises: a grinding cylinder, a grinding mechanism and a screening mechanism; The grinding mechanism is arranged in the grinding cylinder, and the grinding mechanism is used to grind the coal blocks in the grinding cylinder; The screening mechanism is arranged on the grinding cylinder, and comprises a feed port, a first discharge port and a second discharge port; the first discharge port is connected to the grinding cylinder, the grinding cylinder further comprises a third discharge port, and the second discharge port is connected to the third discharge port; The screening mechanism is used to transfer coal lumps in the coal into the grinding cylinder through the first discharge port; the screening mechanism is also used to transfer coal particles in the coal into the third discharge port through the second discharge port.

2. A coal mill for thermal power generation according to claim 1, characterized in that: The screening mechanism comprises a screen; the screen is arranged at the bottom of the feed port, and the angle formed by a straight line perpendicular to the screen and the central axis of the grinding cylinder is an acute angle.

3. A coal mill for thermal power generation according to claim 1, characterized in that: The grinding cylinder also includes a disturbance mechanism; the disturbance mechanism is used to disturb the coal blocks in the grinding cylinder.

4. A coal mill for thermal power generation according to claim 3, characterized in that: The disturbance mechanism comprises a driving member, a transmission member and a disturbance member; The driving member is arranged outside the grinding cylinder; the disturbing member is arranged inside the grinding cylinder, and the driving member drives the disturbing member to move through the transmission member.

5. A coal mill for thermal power generation according to claim 4, characterized in that: The disturbance member is rotatably connected to the inner side wall of the grinding cylinder.

6. A coal mill for thermal power generation according to claim 4, characterized in that: The disturbance member is provided with a connecting member, the connecting member is provided with a through hole, the transmission member is provided with a rotating shaft, and the transmission member is connected to the through hole through the rotating shaft.

7. A coal mill for thermal power generation according to claim 4, characterized in that: A blocking member is also provided in the grinding cylinder, and the connecting end of the disturbance member and the grinding cylinder is arranged within the angle formed by the blocking member and the inner side wall of the grinding cylinder.

8. A coal mill for thermal power generation according to claim 1, characterized in that: The coal mill also includes a base and a water sprinkling mechanism, and the water sprinkling mechanism includes a water tank, a water pump and a water inlet pipe; The water tank is arranged on the base, one end of the water pump is connected to the water tank, and the other end is connected to the water inlet pipe; the water inlet pipe is arranged in the grinding cylinder; The water pump is used to spray the water in the water tank onto the coal blocks in the grinding cylinder through the water inlet pipe.

9. A coal mill for thermal power generation according to claim 8, characterized in that: The watering mechanism comprises a plurality of spray heads, and the spray heads are symmetrically arranged on the inner side wall of the grinding cylinder.

10. A coal mill for thermal power generation according to claim 9, characterized in that: The grinding mechanism comprises a grinding head, a plurality of water spray holes are arranged on the grinding head, and the water inlet pipe is connected to the water spray holes.

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