Impeller device and coal mill

Abstract

The invention relates to an impeller device and a coal mill. Wherein the impeller device comprises an inner ring, an outer ring and a plurality of partition plates, and a cavity is formed between the inner ring and the outer ring; the multiple partition plates are arranged in the cavity at equal intervals, a nozzle cavity is formed between every two adjacent partition plates, each nozzle cavity is provided with an inlet and an outlet, each partition plate is provided with a first end face and a second end face which are opposite in the thickness direction of the partition plate, and the included angle alpha between the second end face and the plane perpendicular to the axis of the outer ring is 40-50 degrees. The partition plate is provided with a third end and a fourth end which are opposite in the axis direction of the outer ring, and the thickness of the partition plate at the fourth end is larger than that of the third end. According to the impeller device, under the condition that the original power of the coal mill is not changed, after the primary hot air flows through the impeller device and is discharged from the outlet, the air speed of the primary hot air is increased, so that coal slag is blown into a separator and is prevented from falling off and being discharged along with slag stone, the coal content in the slag stone discharged by the coal mill is reduced, and the coal mill is protected. And the slag discharge amount of the coal mill is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mills, and in particular to an impeller device and a coal mill. Background Art

[0002] HP bowl coal mill is a device used to crush coal into powder particles. Its impeller device is bolted to the outer cylindrical surface of the drive yoke of the grinding bowl and rotates with the drive yoke. The qualified coal powder crushed by the grinding device is brought into the separator by the primary hot air flowing through the impeller device and sent to the boiler through the coal powder pipeline, and the slag that is difficult to grind is discharged. However, the flow rate of the primary hot air flowing through the nozzle of the impeller device is low, resulting in many coal blocks that should not be discharged being discharged together with the slag, resulting in a large amount of slag discharge. The high coal content in the slag is easy to cause sintering, resulting in blockage and even affecting the operation of the system. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art to at least some extent. To this end, an embodiment of the present invention provides an impeller device, which increases the wind speed of the primary hot air, thereby blowing up the coal slag and bringing it into the separator, preventing the coal slag from falling and being discharged with the slag, thereby reducing the coal content in the slag discharged from the coal mill and reducing the slag discharge amount of the coal mill.

[0004] An embodiment of the present invention provides a coal pulverizer.

[0005] The impeller device of an embodiment of the present invention includes an inner ring, an outer ring and a plurality of partitions, wherein the inner ring and the outer ring are coaxially arranged, the inner ring is located on the inner side of the outer ring, and a cavity is formed between the inner ring and the outer ring; the plurality of partitions are arranged in the cavity at equal intervals, a nozzle cavity is formed between two adjacent partitions, the nozzle cavity has an inlet and an outlet, the partition has a first end face and a second end face relative to each other in the thickness direction thereof, the angle between the second end face and a plane perpendicular to the axis of the outer ring is α, and α is 40°-50°, the partition has a third end and a fourth end relative to each other in the axial direction of the outer ring, the inlet is formed between the third ends of two adjacent partitions, the outlet is formed between the fourth ends of two adjacent partitions, and the thickness of the partition at the fourth end is greater than the thickness at the third end.

[0006] By means of the impeller device of the embodiment of the present invention, without changing the original power of the coal mill, after the primary hot air flows through the impeller device and is discharged from the outlet, the wind speed of the primary hot air is increased, thereby blowing up the coal slag and bringing it into the separator to prevent the coal slag from falling and being discharged with the slag stone, thereby reducing the coal content in the slag stone discharged from the coal mill and reducing the slag discharge amount of the coal mill.

[0007] In some embodiments, the thickness of the third end is 11-13 mm, and the thickness of the fourth end is 14-16 mm.

[0008] In some embodiments, the thickness of the first end is 12 mm and the thickness of the second end is 15 mm.

[0009] In some embodiments, the first plane and the second end surface are both planes.

[0010] In some embodiments, the number of the nozzle chambers is 42.

[0011] In some embodiments, two sides of the partition are respectively welded to the inner ring and the outer ring.

[0012] In some embodiments, the inner ring plate includes a first ring portion and a second ring portion, the first ring portion is connected to the partition plate, the second ring portion is located at the outlet side of the nozzle, and a first mounting hole is provided on the second ring portion.

[0013] In some embodiments, a groove is provided on the second ring portion, and the first mounting hole is located at the groove.

[0014] The coal mill in the embodiment of the present invention comprises a grinding bowl and the impeller device, wherein the inner ring of the impeller device is arranged on the grinding bowl.

[0015] The coal mill according to the embodiment of the present invention has the advantages of small slag discharge amount and small coal content in slag.

[0016] In some embodiments, a second mounting hole is provided on the upper side of the grinding bowl; the inner ring plate includes a first ring portion and a second ring portion, the first ring portion is connected to the partition, the second ring portion is located on the outlet side of the nozzle, and a first mounting hole is provided on the second ring portion, and the first mounting hole and the second mounting hole are connected by bolts to fix the inner ring and the grinding bowl. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural schematic diagram of a coal mill according to an embodiment of the present invention;

[0018] Figure 2 is a partial structural schematic diagram of an impeller device according to an embodiment of the present invention;

[0019] Figure 3 yes Figure 2 Expanded view of CC in the middle;

[0020] Figure 4 yes Figure 2 Schematic diagram of the cross-sectional structure of AA;

[0021] Reference numerals:

[0022] Coal mill 1000;

[0023] Impeller device 100, grinding bowl 200;

[0024] Inner ring 1 , first ring portion 11 , second ring portion 12 , first mounting hole 13 , partition plate 2 , nozzle cavity 20 , second end surface 21 , third end 22 , fourth end 23 , outer ring 3 . DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0026] Please refer to the attached Figures 1 to 4 , the impeller device 100 and the coal mill 1000 according to the embodiment of the present invention are described in detail.

[0027] The coal mill 1000 of the embodiment of the present invention comprises a grinding bowl 200 and an impeller device 100. The impeller device 100 is arranged on the grinding bowl 200.

[0028] The impeller device 100 of the embodiment of the present invention comprises an inner ring 1, an outer ring 3 and a plurality of partitions 2. The inner ring 1 and the outer ring 3 are coaxially arranged, the inner ring 1 is located on the inner side of the outer ring 3, the inner ring 1 is arranged on the grinding bowl 200, and a cavity is formed between the inner ring 1 and the outer ring 3. A plurality of partitions 2 are arranged in the cavity at equal intervals, and a nozzle cavity 20 is formed between two adjacent partitions 2. The nozzle cavity 20 has an inlet and an outlet, and hot air enters the nozzle cavity 20 from the inlet and is discharged from the outlet. The partition 2 has a first end face and a second end face 21 opposite to each other in the thickness direction thereof, and the angle between the second end face 21 and the plane perpendicular to the axis of the outer ring 3 is α, and α is 40°-50°. The partition 2 has a third end 22 and a fourth end 23 opposite to each other in the axis direction of the outer ring 3, an inlet is formed between the third ends 22 of two adjacent partitions 2, and an outlet is formed between the fourth ends 23 of two adjacent partitions 2, and the thickness of the partition 2 at the fourth end 23 is greater than the thickness of the third end 22.

[0029] like Figure 1 As shown, in the use state, the axis of the impeller device 100 extends in the up-down direction, that is, the axis of the outer ring 3 (inner ring 1) extends in the up-down direction, then the plane perpendicular to the axis of the outer ring 3 is the horizontal plane, and the angle between the second end face 21 and the horizontal plane is α. The third end 22 of the partition 2 is the lower end of the partition 2, and the fourth end 23 of the partition 2 is the upper end of the partition 2.

[0030] The thickness of the fourth end 23 of the partition 2 of the impeller device 100 of the embodiment of the present invention is greater than the thickness of the third end 22, so that the effective cross-sectional area of ​​the outlet of the nozzle cavity 20 formed between the two partitions 2 is smaller than the effective cross-sectional area of ​​the inlet, and the space of the nozzle cavity 20 is reduced from the inlet to the outlet, so that the wind speed of the hot air increases after passing through the nozzle cavity 20. At the same time, the outlet of the nozzle cavity 20 is smaller than the inlet, which can prevent slag or coal slag from falling into the nozzle cavity 20 and getting stuck in the nozzle cavity 20, and avoid clogging of the nozzle cavity 20, thereby ensuring that the hot air is evenly distributed and flows stably when passing through the impeller device 100, which is conducive to avoiding the loss of wind speed caused by local eddy currents and turbulence.

[0031] And, if Figure 2 and Figure 3 As shown, α is 40°-50°. Compared with the vertical setting of the partition (α is 0°) or the small inclination setting of the partition in the related art, the inclination angle of the partition 2 in the embodiment of the present invention is larger, and the inclination degree of the partition 2 is larger. When the hot air flows from bottom to top through the partition 2, the wind flow forms a convergence effect, which is beneficial to improve the wind speed of the hot air flowing out of the outlet. At the same time, the evenly distributed inclined partitions 2 are also beneficial to reduce the primary wind resistance, reduce the resistance when the wind flows through the third end 22 and the nozzle cavity 20, and make the primary hot air flow even, stable and smooth when passing through the impeller device 100.

[0032] Therefore, through the impeller device 100 of the embodiment of the present invention, without changing the original power of the coal mill 1000, after the primary hot air flows through the impeller device 100 and is discharged from the outlet, the wind speed of the primary hot air is increased, thereby blowing the coal slag into the separator, preventing the coal slag from falling and being discharged with the slag, thereby reducing the coal content in the slag discharged from the coal mill 1000 and reducing the slag discharge amount of the coal mill 1000.

[0033] For example, α is 43°, 44°, 45° or 46°. In this embodiment, α is 45°.

[0034] In some embodiments, the thickness of the third end 22 is 11-13 mm, and the thickness of the fourth end 23 is 14-16 mm. For example, the thickness of the third end 22 is 11 mm, 12 mm or 13 mm, and the thickness of the fourth end 23 is 14 mm, 15 mm or 16 mm.

[0035] In this embodiment, the thickness of the first end is 12 mm, and the thickness of the second end is 15 mm.

[0036] The number of nozzle cavities 20 is 42. For the HP863 coal mill in the related art, the number of nozzle cavities 20 is increased, and the flow area of ​​the nozzle cavity 20 is reduced, which can ensure that the wind speed of the hot air after passing through the nozzle cavity 20 is high, except for the stone coal, and other coal slag cannot flow into the slag discharge chamber through the impeller device 100, further reducing the discharge of coal slag with the slag stone, further reducing the coal content in the slag stone discharged from the coal mill 1000, and further reducing the slag discharge amount of the coal mill 1000.

[0037] In some embodiments, the first plane and the second end face 21 are both planes, that is, the thickness of the partition 2 gradually increases from the third end 22 to the fourth end 23. Such a partition 2 is easy to process and manufacture, which is beneficial to reduce the manufacturing difficulty and manufacturing cost of the impeller device 100, thereby helping to reduce the modification cost of the coal mill 1000.

[0038] Both sides of the partition plate 2 are respectively welded to the inner ring 1 and the outer ring 3. That is, the inner side of the partition plate 2 is welded to the inner ring 1, and the outer side of the partition plate 2 is welded to the outer ring 3.

[0039] In some embodiments, the inner ring 1 plate includes a first ring portion 11 and a second ring portion 12 , the first ring portion 11 is connected to the partition 2 , and the second ring portion 12 is located at the outlet side of the nozzle, in other words, the second ring portion 12 is located on the upper side of the first ring portion 11 .

[0040] Specifically, in this embodiment, the inner ring 1 and the outer ring 3 are respectively formed by connecting six arc-shaped plates.

[0041] A first mounting hole 13 is formed on the second ring portion 12 , and a second mounting hole is formed on the upper side of the grinding bowl 200 . The first mounting hole 13 and the second mounting hole are connected by bolts to fix the inner ring 1 and the grinding bowl 200 .

[0042] The first mounting hole 13 is used to cooperate with the bolt to mount the inner ring 1 on the grinding bowl 200. The first mounting hole 13 is located on the second ring portion 12, and the first mounting hole 13 is located on the upper side of the outlet of the nozzle cavity 20. On the one hand, it reduces the space occupied by the bolts installed on the inner ring 1 in the nozzle cavity 20, avoids the bolts from causing wind resistance in the nozzle cavity 20, and reduces the flow rate of the hot air. On the other hand, it also avoids the bolts from being eroded by the hot air, which can extend the service life of the bolts, avoid the bolts from loosening or even falling off, thereby avoiding the loosening of the impeller device 100, avoiding the frequent replacement and installation of the bolts and causing the coal mill 1000 to shut down, and improving the firmness and reliability of the impeller device 100 installed on the grinding bowl 200.

[0043] In some embodiments, a groove (not shown in the figure) is provided on the second ring portion 12, and the first mounting hole 13 is located at the groove. The groove of the second ring portion 12 can provide a space for the bolt head of the bolt, prevent hot air from flowing through the bolt, further prevent the hot air from corroding the bolt, further extend the service life of the bolt, further prevent the bolt from loosening or even falling, further prevent the impeller device 100 from loosening, further prevent the coal mill 1000 from shutting down due to frequent replacement and installation of bolts, and further improve the firmness and reliability of the impeller device 100 installed on the grinding bowl 200.

[0044] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0048] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0049] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An impeller device (100), characterized in that: include: An inner ring (1) and an outer ring (3), wherein the inner ring (1) and the outer ring (3) are coaxially arranged, the inner ring (1) is located on the inner side of the outer ring (3), and a cavity is formed between the inner ring (1) and the outer ring (3); and A plurality of partitions (2) are arranged in the cavity at equal intervals, a nozzle cavity (20) is formed between two adjacent partitions (2), the nozzle cavity (20) having an inlet and an outlet, the partition (2) having a first end face and a second end face (21) opposite to each other in the thickness direction thereof, the angle between the second end face (21) and a plane perpendicular to the axis of the outer ring (3) is α, α being 40°-50°, the partition (2) having a third end (22) and a fourth end (23) opposite to each other in the axis direction of the outer ring (3), the inlet being formed between the third ends (22) of two adjacent partitions (2), the outlet being formed between the fourth ends (23) of two adjacent partitions (2), the thickness of the partition (2) at the fourth end (23) being greater than the thickness of the third end (22).

2. The impeller device (100) according to claim 1, characterized in that: The thickness of the third end (22) is 11-13 mm, and the thickness of the fourth end (23) is 14-16 mm.

3. The impeller device (100) according to claim 2, characterized in that: The thickness of the first end is 12 mm, and the thickness of the second end is 15 mm.

4. The impeller device (100) according to claim 2, characterized in that: The first plane and the second end surface (21) are both planes.

5. The impeller device (100) according to claim 2, characterized in that: The number of the nozzle chambers (20) is 42.

6. The impeller device (100) according to claim 1, characterized in that: Both sides of the partition plate (2) are respectively connected to the inner ring (1) and the outer ring (3) by welding.

7. The impeller device (100) according to claim 1, characterized in that: The inner ring (1) plate comprises a first ring portion (11) and a second ring portion (12), wherein the first ring portion (11) is connected to the partition plate (2), and the second ring portion (12) is located at the outlet side of the nozzle, and a first mounting hole (13) is provided on the second ring portion (12).

8. The impeller device (100) according to claim 7, characterized in that: The second ring portion (12) is provided with a groove, and the first mounting hole (13) is located in the groove.

9. A coal mill (1000), characterized in that: It comprises a grinding bowl (200) and an impeller device (100) according to any one of claims 1 to 8, wherein an inner ring (1) of the impeller device (100) is arranged on the grinding bowl (200).

10. The coal pulverizer (1000) according to claim 9, characterized in that: A second mounting hole is provided on the upper side of the grinding bowl (200); the inner ring (1) plate comprises a first ring portion (11) and a second ring portion (12), the first ring portion (11) is connected to the partition (2), the second ring portion (12) is located on the outlet side of the nozzle, a first mounting hole (13) is provided on the second ring portion (12), the first mounting hole (13) and the second mounting hole are connected by bolts to fix the inner ring (1) and the grinding bowl (200).

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