A new type of double inner cone medium speed coal mill pulverized coal separator

Abstract

This invention provides a novel double-inner-cone medium-speed coal mill pulverized coal separator, belonging to the field of thermal power generation technology. It includes a shell, inside which is an inner cone. A pulverized coal distributor, a coal drop pipe, a pulverized coal outlet pipe, and a rotating shaft are inserted into the upper surface of the shell. This invention designs the pulverized coal particles to encounter the inner side of the inner cone during their downward rotation. Because the inner cone is slit, it collects coarser pulverized coal particles, resulting in better separation of qualified pulverized coal. The collected particles fall to the bottom of the inner cone and the shell cone, and are returned to the coal mill for re-grinding via an airlock. The slit-type inner cone collects coarser pulverized coal particles, preventing them from being carried out of the coal powder conveying pipe by the gas, thus improving the uniformity of the pulverized coal and effectively reducing backmixing, resulting in finer pulverized coal particles at the separator outlet.

Description

Technical Field

[0001] This utility model relates to the field of thermal power generation technology, and in particular to a novel double-inner-cone medium-speed coal mill pulverizer. Background Technology

[0002] Currently, there are two main types of medium-speed pulverized coal separators used in coal-fired power plants: dynamic separators and static separators. Dynamic separators produce finer pulverized coal with better uniformity. However, due to the complex rotating structure of dynamic separators, which also require an additional motor, control system, and sealing air system, many problems frequently arise during operation, resulting in high operating and maintenance costs. Traditional static separators have relatively stable operating performance, but the quality of the pulverized coal they produce is not as good as that of dynamic separators.

[0003] The limited separation space at the lower part of the inner cone causes coarser coal particles to be mixed with some finer particles during collection, while finer particles, moving upwards, also carry coarser particles, resulting in backmixing. Some coarser particles, upon hitting the inner wall of the inner cone, move upwards and may even be carried by the airflow to the coal separator outlet. Other coarser particles, accumulating at the lower part of the inner cone, are carried out of the coal separator by the upward airflow. These phenomena ultimately lead to poor coal powder fineness and insufficient uniformity.

[0004] The separation space at the bottom of the inner cone is limited. During the collection process, coarser coal powder particles will carry away some finer coal powder particles, and the finer coal powder particles will also carry away coarser coal powder particles as they move upward, causing back mixing. Some coarser coal powder particles will move upward after hitting the inner wall of the inner cone, and may even be carried by the airflow to the outlet of the coal powder separator. Some coarser coal powder particles will also be carried out of the coal powder separator by the upward airflow during the accumulation process at the bottom of the inner cone. These phenomena ultimately result in poor coal powder fineness and insufficient uniformity index.

[0005] In order to better collect coarser coal particles while ensuring that qualified coal particles reach the coal powder outlet pipe smoothly, there is an urgent need to develop a static separator with better performance indicators. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a novel double-inner-cone medium-speed coal mill coal powder separator to solve the existing problems of coal powder separation, effectively reducing back-mixing, increasing separation space, reducing coal powder fineness, and improving coal powder uniformity index.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0008] A novel double-inner-cone medium-speed coal mill pulverizer includes a shell, an inner cone inside the shell, a pulverizer distributor inserted into the upper surface of the shell, a coal drop pipe inserted into the inside of the pulverizer, a pulverizer outlet pipe inserted into the upper surface of the pulverizer, a rotating shaft at the inner top of the shell, an air lock on the lower surface of the shell, a blade seat fitted onto the surface of the shell, radial blades on the surface of the blade seat, an outer inner cone inside the inner cone, an inner inner cone on the inner sidewall of the outer inner cone, and a pulverizer inlet at the bottom of the shell.

[0009] Optionally, the shape of the slits in the outer inner cone is an oblique line, and the slits in the outer inner cone are evenly distributed around the circumference.

[0010] Optionally, the number of slits in the outer inner cone is several, and the slits in the outer inner cone are located in the middle region.

[0011] Optionally, the shape of the slits in the inner cone of the inner layer is a straight line, and the slits in the inner cone of the inner layer are evenly distributed around the circumference.

[0012] Optionally, the number of slits in the inner cone of the inner layer is between 12 and 20, and the slits in the inner cone of the inner layer are located in the middle region.

[0013] Optionally, the outer inner cone and the inner inner cone are a double-layered hollow structure, and the inner inner cone and the outer inner cone form a channel.

[0014] Optionally, a sealing ring is provided at the top of the inner cone and outer cone channel, and an airlock is provided at the bottom of the inner cone and outer cone channel.

[0015] Optionally, the inner top of the housing is provided with a mounting groove, and the mounting groove contains a number of rotating shafts.

[0016] Optionally, one end of the blade seat is provided with a shaft hole, and a rotating shaft is provided inside the shaft hole. The blade seat and the rotating shaft are at the same height.

[0017] Optionally, the upper surface of the pulverized coal distributor is fitted with two pulverized coal outlet pipes, and a pulverized coal hole is opened in the center of the upper surface of the pulverized coal distributor, with a coal drop pipe inserted inside the pulverized coal hole.

[0018] Compared with the prior art, this utility model has at least the following beneficial effects:

[0019] In the above scheme, pulverized coal and gas enter from the pulverized coal inlet and rotate upwards. Radial blades change the direction of motion, causing the gas to enter the inner cone and begin downward centrifugal motion. Workers can install different outer and inner cones within the shell according to actual conditions. Coarser pulverized coal particles encounter the inner side of the inner cone during their downward rotation. Because the inner cone is slit, it collects the coarser pulverized coal particles during their movement within the cone. For the remaining pulverized coal... In terms of separation, the larger separation space allows for better separation of qualified coal powder. The collected coal powder particles fall into the channel between the inner cone and the outer cone, sliding directly to the bottom of the inner cone and the outer cone. They then return to the coal mill for re-grinding via the airlock. Thus, after the slit-type inner cone collects coarser coal powder particles, these particles are not carried out by the gas into the coal powder conveying pipeline, improving the uniformity of the coal powder and effectively reducing backmixing. This results in finer coal powder particles with a high uniformity index at the outlet of the coal powder separator. Attached Figure Description

[0020] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the present invention and, together with the specification, further serve to explain the principles of the present invention and enable those skilled in the art to implement and use the present invention.

[0021] Figure 1 A three-dimensional structural diagram of a new type of pulverized coal separator for a double-inner-cone medium-speed coal mill.

[0022] Figure 2 A schematic diagram of the outer shell structure of a new type of double-inner-cone medium-speed coal mill coal powder separator;

[0023] Figure 3 A schematic diagram of the coal powder distributor in a new type of double-inner-cone medium-speed coal mill coal powder separator.

[0024] Figure 4 A schematic diagram of the planar structure of the inner cone of the coal powder separator shell of a new type of double inner cone medium-speed coal mill.

[0025] Figure 5 A schematic diagram of the radial blade planar structure of a coal powder separator for a novel double-inner-cone medium-speed coal mill.

[0026] Figure 6 A schematic diagram of the radial blade structure of a new type of double-inner-cone medium-speed coal mill coal powder separator;

[0027] Figure 7 A schematic diagram of the outer inner cone structure of the pulverized coal separator in a novel double inner cone type medium-speed coal mill.

[0028] Figure 8This is a schematic diagram of the inner cone structure of the pulverized coal separator in a novel double-inner-cone medium-speed coal mill.

[0029] Figure label:

[0030] 1. Outer shell; 2. Inner cone of the shell; 3. Pulverized coal distributor; 4. Coal drop pipe; 5. Pulverized coal outlet pipe; 6. Rotating shaft; 7. Airlock; 8. Blade seat; 9. Radial blade; 10. Outer inner cone; 11. Inner inner cone; 12. Pulverized coal inlet.

[0031] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiment of this utility model. However, this is only for illustrative purposes and is not intended to limit this utility model to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0032] The present invention provides a novel double-inner-cone medium-speed coal mill pulverizer separator in conjunction with the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; for some known technologies, those skilled in the art can also use other alternative methods to implement the invention. Furthermore, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0033] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0034] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0035] It is understood that the meanings of “on”, “above”, and “above” in this utility model should be interpreted in the broadest manner, such that “on” not only means “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” not only means “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0036] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0037] like Figures 1 to 7 As shown, this utility model provides a novel double-inner-cone medium-speed coal mill pulverizer, including a shell 1. Inside the shell 1 is an inner cone 2. A pulverizer 3 is inserted into the upper surface of the shell 1. A coal drop pipe 4 is inserted into the inside of the pulverizer 3. Two pulverizer outlet pipes 5 are inserted into the upper surface of the pulverizer 3. A pulverizer hole is formed at the center of the upper surface of the pulverizer 3, and the coal drop pipe 4 is inserted into the inside of the pulverizer hole. A pulverizer outlet pipe 5 is inserted into the upper surface of the pulverizer 3. A rotating shaft 6 is provided at the inner top of the shell 1. A mounting groove is provided at the inner top of the shell 1, and several rotating shafts 6 are provided inside the mounting groove. An airlock 7 is provided on the lower surface of the shell 1. A blade seat 8 is fitted onto the surface of the shell 1. One end of the blade seat 8 has a shaft hole, and the rotating shaft 6 is located inside the shaft hole. The blade seat 8 is at the same height as the rotating shaft 6. Radial blades 9 are provided on the surface of the blade seat 8. The interior of body 2 is provided with an outer inner cone 10. The slits of the outer inner cone 10 are oblique lines and are evenly distributed around the circumference. The number of slits in the outer inner cone 10 is fixed, and the slits are located in the middle area. The inner wall of the outer inner cone 10 is provided with an inner inner cone 11. The slits of the inner inner cone 11 are straight lines and are evenly distributed around the circumference. The number of slits is between 12 and 20. The slits of the inner cone 11 are located in the middle area. The outer cone 10 and the inner cone 11 are a double-layered hollow structure. The inner cone 11 and the outer cone 10 form a channel. The top of the channel between the inner cone 11 and the outer cone 10 is provided with a sealing ring. The bottom of the channel between the inner cone 11 and the outer cone 10 is provided with an airlock 7. The bottom of the outer shell 1 is provided with a pulverized coal inlet 12.

[0038] Coal powder and gas enter through the coal powder inlet 12 and rotate upwards. The radial blades 9 change the direction of motion. The inner side of the inner cone 2 can be fitted with both the outer inner cone 10 and the inner inner cone 11. Depending on the actual situation, either the outer inner cone 10 or the inner inner cone 11 can be installed inside the inner cone 2. When using the inner cone 2 with the inner inner cone 11 installed, the coal powder enters the inner inner cone 11 and begins a downward centrifugal motion. Coarser coal powder particles will encounter the inner inner cone during this downward rotation. Inside cone 11, as the coal powder particles move within the inner cone 11, the slits in the inner cone 11 allow for the collection of coarser coal powder particles. This collection provides a larger separation space for the remaining coal powder, enabling better separation of qualified coal powder. The collected coal powder particles fall into the channel between the inner cone 11 and the outer cone 2, sliding directly to the bottom of both structures. They then return to the mill via the airlock 7 for re-grinding, thus reducing the size of the coarser coal powder particles. It will not be carried out by gas into the pulverized coal conveying pipeline, thus improving the uniformity of the pulverized coal and effectively avoiding backmixing. This results in finer pulverized coal particles at the outlet of the pulverized coal separator, with a high uniformity index. When using the inner cone 2 of the shell with the outer inner cone 10 installed, the particles enter the outer inner cone 10 and begin to undergo downward centrifugal motion. During this downward rotation, coarser pulverized coal particles will encounter the inner side of the outer inner cone 10. Because the outer inner cone 10 is slit, it can collect the coarser pulverized coal particles during their movement within the outer inner cone 10, thereby reducing the uniformity. After the coarse coal powder particles are collected, there is a larger separation space for the remaining coal powder, which can better separate qualified coal powder. The collected coal powder particles fall into the channel between the outer inner cone 10 and the inner cone 2 of the shell, and slide directly to the bottom of the outer inner cone 10 and the inner cone 2 of the shell. They are then returned to the coal mill for re-grinding through the air lock 7. Thus, the coarser coal powder particles will not be carried out by the gas to the coal powder conveying pipeline, which improves the uniformity of the coal powder and effectively avoids back mixing. This results in finer coal powder particles with a high uniformity index at the outlet of the coal powder separator.

[0039] The working principle provided by this utility model is as follows: In a traditional medium-speed coal powder separator, coal powder and gas enter through the coal powder inlet 12 and rotate upwards. The radial blades 9 change the direction of motion, and the coal powder enters the inner cone and begins to undergo downward centrifugal motion. During this downward rotation, coarser coal powder particles encounter the inner side of the inner cone. Some of these particles are rebounded and rotate upwards. This rebound may carry the coarser particles out of the equipment or cause them to slide to the bottom of the inner cone. The remaining coarser particles continue to move downwards. The coal powder particles are collected and returned to the coal mill for regrinding via the airlock 7. During the brief pause in the downward-moving coarser coal powder without passing through the airlock 7, they are carried by the upward airflow into the coal powder distributor 3, causing them to enter the coal powder outlet pipe 5. This results in the coal powder entering the boiler being coarser and less uniform. When using this device, and using the inner cone 2 of the shell with the inner cone 11 installed, the coarser coal powder particles will encounter the inner side of the inner cone 11 during their downward rotational movement. During the movement of the coal powder particles within the inner cone 11, because the inner cone 11 is slit, it can... The coarser coal particles are collected and slide directly to the bottom of the inner cone 11 and the outer cone 2 in the channel between them. They then return to the coal mill for re-grinding via the airlock 7. This process completely separates them from the qualified coal particles, effectively preventing back-mixing and resulting in finer, more uniform coal particles at the coal separator outlet. When using this device, if the outer cone 2 (with the outer cone 10 installed) is used, coarser coal particles will encounter the inner side of the outer cone 10 during their downward rotation. During the movement within the inner cone 10, because the outer inner cone 10 is slit, coarser coal powder particles can be collected and directly slide down to the bottom of the outer inner cone 10 and the inner cone 2 of the shell in the channel between the outer inner cone 10 and the inner cone 2 of the shell. They then return to the coal mill for re-grinding through the airlock 7. Thus, they are completely separated from qualified coal powder particles during this process, effectively avoiding back mixing. This results in finer coal powder particles at the outlet of the coal powder separator and a higher uniformity index. As a result, workers can install different outer inner cones 10 and inner inner cones 11 in the inner cone 2 of the shell according to the actual situation.

[0040] This utility model encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this utility model. To provide the public with a thorough understanding of this utility model, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand this utility model even without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of this utility model, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0041] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A novel double-inner-cone type medium-speed coal mill pulverizer, characterized in that, The device includes an outer shell, an inner cone inside the shell, a pulverized coal distributor inserted into the upper surface of the shell, a coal drop pipe inserted into the inside of the pulverized coal distributor, a pulverized coal outlet pipe inserted into the upper surface of the pulverized coal distributor, a rotating shaft at the inner top of the shell, an airlock on the lower surface of the shell, a blade seat fitted onto the surface of the shell, radial blades on the surface of the blade seat, an outer inner cone inside the inner cone, an inner inner cone on the inner sidewall of the outer inner cone, and a pulverized coal inlet at the bottom of the shell.

2. The novel double-inner-cone medium-speed coal mill pulverizer according to claim 1, characterized in that, The outer inner cone has a slit shape that is oblique, and the slits are evenly distributed around the circumference.

3. The novel double-inner-cone medium-speed coal mill pulverizer according to claim 2, characterized in that, The number of slits in the inner cone of the outer layer is several, and the slits in the inner cone of the outer layer are located in the middle region.

4. The novel double-inner-cone medium-speed coal mill pulverizer according to claim 1, characterized in that, The inner cone of the inner layer has a straight slit shape, and the slits of the inner cone are evenly distributed around the circumference.

5. The novel double-inner-cone medium-speed coal mill pulverizer according to claim 4, characterized in that, The number of slits in the inner cone of the inner layer is between 12 and 20, and the slits in the inner cone of the inner layer are located in the middle area.

6. The novel double-inner-cone medium-speed coal mill pulverizer according to claim 1, characterized in that, The outer inner cone and the inner inner cone are a double-layered hollow structure, and the inner inner cone and the outer inner cone form a channel.

7. The novel double-inner-cone medium-speed coal mill pulverizer according to claim 1, characterized in that, The inner cone and outer cone channels are provided with a sealing ring at the top and an airlock at the bottom.

8. The novel double-inner-cone medium-speed coal mill pulverizer according to claim 1, characterized in that, The inner top of the outer casing is provided with a mounting groove, and a number of rotating shafts are provided inside the mounting groove.

9. The novel double-inner-cone medium-speed coal mill pulverizer according to claim 1, characterized in that, One end of the blade seat is provided with a shaft hole, and a rotating shaft is provided inside the shaft hole. The blade seat and the rotating shaft are at the same height.

10. The novel double-inner-cone medium-speed coal mill pulverizer according to claim 1, characterized in that, The upper surface of the pulverized coal distributor is fitted with two pulverized coal outlet pipes. A pulverized coal hole is opened in the center of the upper surface of the pulverized coal distributor, and a coal drop pipe is inserted into the inside of the pulverized coal hole.

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