Multi-stage pulverized coal separator with dynamic guide vanes

Abstract

The invention discloses a multi-stage pulverized coal separator with dynamic guide vanes. The multi-stage pulverized coal separator comprises a mounting rack; the transmission assembly is assembled on the mounting frame and is used for conveying pulverized coal; the screening assembly is assembled on the mounting frame and is used for screening pulverized coal with qualified sizes; the threaded discharging opening is fixedly connected to the side face of the mounting frame; and the circulating connecting pipe is fixedly connected to the tail end of the mounting frame. The screening efficiency of the separator is high.

Description

Technical Field

[0001] This invention belongs to the technical field of multi-stage pulverized coal separators, and relates to a multi-stage pulverized coal separator with dynamic guide vanes. Background Technology

[0002] A multi-stage pulverized coal separator with dynamic guide vanes is a device that utilizes a multi-stage separation structure and adjustable guide vanes to achieve efficient classification and separation of pulverized coal particles. By dynamically adjusting the angle of the guide vanes, the airflow distribution is optimized to improve separation accuracy and processing capacity, making it widely used in pulverized coal combustion and processing.

[0003] CN206642897U discloses a vortex-inertia coupling coarse powder separator, which includes at least: a shell, the shell being a hollow inverted conical structure, the bottom end of the shell being provided with a powder return pipe and an inlet pipe, and the top end of the shell being provided with an outlet pipe; a flow guiding device, the flow guiding device being disposed inside the inlet pipe, the flow guiding device including at least an adjusting component and a plurality of flow guiding blades spaced circumferentially along the inlet pipe, a flow guiding channel for gas flow being formed between adjacent two flow guiding blades, the adjusting component including at least an adjusting shaft aligned with each of the flow guiding blades, the adjusting shaft being radially arranged along the inlet pipe and fixedly connected to the flow guiding blades aligned with the adjusting shaft, the adjusting shaft extending outward from the inlet pipe and being rotatable relative to the inlet pipe, and the rotation of the adjusting shaft driving the flow guiding blades to rotate around the axis of the adjusting shaft. By rotating the adjusting shaft to drive the guide vanes to rotate, the tilt angle of the guide vanes can be adjusted. This reduces the wear of the fixed position of the vanes on the inlet pipe caused by the flow velocity, thus solving the problem that the required particle size fineness increases due to the larger angle of the stationary vanes, requiring frequent maintenance or replacement of the guide vanes. This reduces the labor intensity of the workers, extends the service life of the guide vanes, and can separate coarse powder with the required particle size fineness. It also has the advantages of flexible adjustment and wide load adaptability. By driving multiple adjusting shafts to rotate synchronously through the linkage adjusting ring, the linkage of all guide vanes can be realized, changing the tilt angle of all guide vanes and making the tilt angle of all guide vanes consistent, thus making the operation of adjusting the tilt angle of the guide vanes simpler and more convenient.

[0004] Publication No. CN102600954A discloses a double-volute coal powder separator, which consists of an air pipe, a guide plate, a separation chamber, a coal inlet pipe, a coal outlet pipe, spiral blades, and a spiral feed housing. The outer surface of the air pipe is provided with spiral blades, and both ends of the spiral blades are connected to the air pipe. The other parts are suspended above the outer surface of the air pipe with gaps. One end of the air pipe and the spiral blades is located in the separation chamber, and the other end is wrapped in the spiral feed housing. A coal inlet pipe is provided above one end of the spiral blades in the separation chamber. A guide plate is provided on the side of the coal inlet pipe. The guide plate is inclined and bent into an arc-shaped rolled edge at the top. The position of the arc-shaped rolled edge corresponds to the position of the coal outlet pipe. Two pulverized coal separators are located on both sides of the coal mill. Pulverized coal enters the pulverized coal separator through pulverized coal inlet B and is fed into the coal mill by the spiral blades. Air enters the coal mill through air inlet A and air pipe, carrying the fine pulverized coal in the coal mill back into the pulverized coal separator. The fine pulverized coal and air enter the separation chamber through the gaps in the spiral blades. During separation, the pulverized coal is guided by the guide plate to rotate. Coarse particles are subjected to centrifugal force and slide down the wall, while fine pulverized coal is discharged from the pulverized coal outlet C.

[0005] However, although the existing multi-stage coal powder separator with dynamic guide vanes can adjust the real-time feed pressure of the separator through the dynamic guide vanes, the pressure of the coal powder is still relatively high when it enters the screening stage. Most existing devices directly screen the high-pressure coal powder, and although multiple screening layers are used, the screening efficiency is still poor. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a multi-stage coal powder separator with dynamic guide vanes, which has a high screening efficiency.

[0007] To achieve the above objectives, this invention discloses a multi-stage pulverized coal separator with dynamic guide vanes, comprising:

[0008] Mounting rack;

[0009] A transmission assembly mounted on the mounting frame, the transmission assembly being used to convey pulverized coal;

[0010] A screening assembly mounted on the mounting frame, the screening assembly being used to screen coal powder of acceptable size;

[0011] A threaded outlet is fixedly connected to the side of the mounting bracket;

[0012] A circulation connecting pipe fixedly connected to the end of the mounting bracket.

[0013] A further improvement of the multi-stage pulverized coal separator with dynamic guide vanes described in this invention is as follows:

[0014] Furthermore, the transmission assembly includes:

[0015] A connecting groove is formed on the side wall of the mounting frame. An outer pipe is fixedly connected to one end of the connecting groove. A rotating groove is formed on the other end of the outer pipe. A feed port is connected to the top of the outer pipe.

[0016] Furthermore, a rotating rod is fitted inside the rotating groove, the rotating rod is connected to the output end of the first motor, and a spiral blade is fixedly connected to the surface of the rotating rod.

[0017] Furthermore, the first motor is mounted on the side wall of the outer pipe and is fitted into the rotating slot.

[0018] Furthermore, the rotating rod forms a mutually rotating structure with the rotating groove via the first motor, and the rotating rod and the spiral blade rotate synchronously.

[0019] Furthermore, the screening component includes:

[0020] An integrated groove is formed in the side wall of the mounting frame. A toothed ring is fitted inside the integrated groove. A gear is meshed on the surface of the toothed ring. One side of the toothed ring is connected to a rotating sleeve. The other side of the gear is connected to the output end of a second motor. A screening barrel is threadedly connected to the rotating sleeve. Screening holes are formed on the inner wall of the screening barrel.

[0021] Furthermore, the spiral blades are respectively attached to the inner walls of the outer connecting pipe and the screening barrel, and the ends of the rotating rod and the spiral blades extend and fit into the screening barrel.

[0022] Furthermore, the threaded discharge port is located directly below the side surface of the screening barrel, and a circulation connection pipe is rotatably connected to the end of the screening barrel.

[0023] Furthermore, the screening holes are provided in multiple sets, and the screening holes are distributed at equal angles and equal intervals on the inner wall of the screening barrel.

[0024] Furthermore, the gear and the output end of the second motor are both fitted into the integrated groove, and the gear and the gear ring form a mutually rotating structure through the second motor.

[0025] The present invention has the following beneficial effects:

[0026] The multi-stage coal powder separator with dynamic guide vanes described in this invention effectively reduces the pressure of conveying coal powder through the dynamic guiding effect of the spiral vanes, achieving stable conveying and uniform distribution of coal powder. This avoids direct screening of pressurized coal powder. In conjunction with the multiple sets of equal-angle screening holes and rotary screening in the screening barrel, the screening accuracy and efficiency are effectively improved. At the same time, the circulation connection pipe enables the return and recycling of unqualified particles for crushing, reducing material waste, enhancing the continuity and automation level of the system, and improving the overall stability and reliability of coal powder separation.

[0027] Furthermore, the transmission assembly drives the rotating rod and spiral blades to rotate via a first motor. The spiral blades adhere closely to the outer connecting pipe and the inner wall of the screening barrel, creating a continuous pushing force for the coal powder. This design not only prevents coal powder from depositing and clogging in the pipeline but also initially disperses the coal powder through the rotation of the spiral blades, allowing for preliminary separation of coarse and fine particles before they enter the screening assembly, reducing the burden on subsequent screening. The outer connecting pipe is directly connected to the feed inlet. After entering through the feed inlet, the coal powder is quickly conveyed to the screening barrel by the spiral blades, reducing the residence time of coal powder in the pipeline in traditional separators and improving the compactness of the overall separation process.

[0028] Furthermore, the inner wall of the screening drum features multiple sets of screening holes distributed at equal angles and intervals, forming a multi-stage screening structure. During the rotation of the screening drum, fine particles pass through the screening holes into the qualified coal powder collection system, while coarse particles are retained and returned to the coal mill for regrinding via a circulation connection pipe. This design significantly improves screening accuracy and ensures the uniformity of the output coal powder. A second motor drives a gear that meshes with a gear ring, rotating the screening drum. By adjusting the speed of the second motor, the rotational speed of the screening drum can be changed, thereby dynamically adjusting the throughput efficiency of the screening holes. For example, increasing the rotational speed enhances centrifugal force, allowing more fine particles to pass through the screening holes, enabling online adjustment of the coal powder fineness to adapt to different coal qualities and combustion requirements.

[0029] Furthermore, the circulating connection pipe reintroduces the coarse coal powder from the end of the screening tank into the coal mill, forming a closed-loop coal powder circulation system. This design avoids waste of coarse coal powder, improves the overall utilization rate of coal powder, and reduces the risk of equipment wear and failure due to coarse coal powder accumulation. The closed-loop circulation system balances the feed and discharge rates of the coal mill, preventing equipment vibration or shutdown due to coal powder accumulation or insufficient supply, significantly improving the operational stability of the pulverizing system. Attached Figure Description

[0030] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0031] Figure 1 This is a side view of the external structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the cross-sectional side view of the part of the present invention;

[0033] Figure 3 This is a cross-sectional exploded side view of the various components of the present invention;

[0034] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle;

[0035] Figure 5 For the present invention Figure 3 Enlarged structural diagram at point B.

[0036] Among them, 1 is the mounting bracket, 201 is the connecting groove, 202 is the external pipe, 203 is the rotating groove, 204 is the feed inlet, 205 is the rotating rod, 206 is the first motor, 207 is the spiral blade, 301 is the integrated groove, 302 is the gear ring, 303 is the gear, 304 is the rotating sleeve, 305 is the second motor, 306 is the screening barrel, 307 is the screening hole, 4 is the threaded discharge port, and 5 is the circulation connecting pipe. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0039] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0040] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this invention generally indicates that the preceding and following objects have an "or" relationship.

[0041] It should be understood that although terms such as first, second, third, etc., may be used in the embodiments of the present invention to describe the preset range, these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from one another. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0042] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0044] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0045] This invention provides a multi-stage pulverized coal separator with dynamic guide vanes, such as... Figure 1-5 As shown, a multi-stage coal powder separator with dynamic guide vanes includes: a mounting frame 1; a transmission assembly mounted on the mounting frame 1 for stable transmission of coal powder; a screening assembly mounted on the mounting frame 1 for screening coal powder of qualified size; a threaded discharge port 4 fixedly connected to one side of the mounting frame 1; and a circulation connection pipe 5 fixedly connected to the end of the mounting frame 1.

[0046] In this embodiment, pressurized pulverized coal enters the outer pipe 202 through the feed inlet 204 via a connected external device. After entering the outer pipe 202, the pulverized coal is pushed by the rotational force of the spiral blade 207, and the pressure gradually decreases during the pushing process. Then, the first motor 206 is started, which drives the rotating rod 205 to rotate, thereby driving the spiral blade 207 to push the pulverized coal. After the pulverized coal enters the screening barrel 306, the second motor 305 drives the gear 303 to mesh with the gear ring 302 to rotate, thereby driving the screening barrel 306 to rotate. The pulverized coal is uniformly screened in the screening barrel 306 while being stably conveyed. Qualified particles are discharged through the threaded discharge port 4 and directly enter the combustion chamber for combustion through the connecting pipe. Unqualified particles are returned to the combustion chamber for crushing through the circulation connecting pipe 5, thus achieving stable conveying and efficient screening.

[0047] In a further preferred embodiment of the present invention, the transmission assembly includes: a connecting groove 201 formed on the side wall of the mounting frame 1, an outer pipe 202 fixedly connected to the outer edge of one end of the connecting groove 201, a rotating groove 203 formed at the other end of the outer pipe 202, a feed inlet 204 connected to the top end of the outer pipe 202, a rotating rod 205 embedded inside the rotating groove 203, one side of the rotating rod 205 being connected to the output end of the first motor 206, and a spiral blade 207 fixedly connected to the surface of the rotating rod 205.

[0048] In this embodiment, the transmission assembly is used to feed pulverized coal from the feed inlet 204 into the outer pipe 202, and then stably convey it to the screening barrel 306 through the connecting groove 201. The first motor 206 drives the rotating rod 205 to rotate, which in turn drives the spiral blade 207 fixed on its surface to rotate, so as to achieve uniform propulsion of pulverized coal in the outer pipe 202 and the screening barrel 306, thereby ensuring that pulverized coal enters the screening area continuously and stably, and improving the overall conveying efficiency.

[0049] In a further preferred embodiment of the present invention, the main body of the first motor 206 is mounted on the side wall of the outer pipe 202, and the first motor 206 is fitted into the rotating groove 203.

[0050] In this embodiment, the first motor 206 is used to drive the rotating rod 205 to rotate, thereby driving the spiral blade 207 to rotate, so as to realize the stable conveying of coal powder in the external pipe 202 and the screening barrel 306.

[0051] In a further preferred embodiment of the present invention, the rotating rod 205 forms a mutually rotating structure with the rotating groove 203 via the first motor 206, and the rotating rod 205 and the spiral plate 207 rotate synchronously.

[0052] In this embodiment, the rotating rod 205 is driven to rotate by the first motor 206, which in turn drives the spiral blade 207 to rotate, thereby realizing the propulsion and conveying of coal powder in the outer pipe 202 and the screening barrel 306.

[0053] In a further preferred embodiment of the present invention, the screening assembly includes: an integrated groove 301 formed on the side wall of the mounting frame 1, a toothed ring 302 fitted inside the integrated groove 301, a gear 303 meshing on the surface of the toothed ring 302, one side of the toothed ring 302 being connected to a rotating sleeve 304, one side of the gear 303 being connected to the output end of a second motor 305, and a screening barrel 306 threadedly connected to the other side of the rotating sleeve 304, with screening holes 307 formed on the inner wall of the screening barrel 306.

[0054] In this embodiment, the screening component is used to screen the incoming coal powder. The second motor 305 drives the gear 303 to rotate. The gear 303 engages with the gear ring 302, which drives the rotating sleeve 304 and the screening barrel 306 to rotate, so that the coal powder is screened at the screening hole 307. Qualified coal powder is discharged through the screening hole 307, and unqualified coal powder enters the circulation connecting pipe 5 from the end for backflow and crushing, thereby improving screening efficiency and accuracy.

[0055] In a further preferred embodiment of the present invention, the other side of the spiral blade 207 is respectively attached to the inner wall of the outer pipe 202 and the screening barrel 306, and one end of the rotating rod 205 and the spiral blade 207 extends and is embedded in the screening barrel 306.

[0056] In this embodiment, the spiral blade 207 is fixed to the surface of the rotating rod 205, and as it rotates, it pushes the coal powder along the inner wall of the outer pipe 202 and the screening barrel 306, so as to achieve continuous and uniform conveying.

[0057] In a further preferred embodiment of the present invention, the threaded discharge port 4 is located directly below the side surface of the screening barrel 306, and the end of the screening barrel 306 is rotatably connected to a circulation connecting pipe 5.

[0058] In this embodiment, the threaded discharge port 4 is located below the screening barrel 306 to stably discharge the qualified coal powder discharged from the screening hole 307, thereby achieving precise discharge. The circulation connecting pipe 5 is connected to the end of the screening barrel 306 to return unscreened or unqualified coal powder for crushing.

[0059] In a further preferred embodiment of the present invention, multiple sets of sieve holes 307 are provided, and the sieve holes 307 are distributed at equal angles and equal intervals on the inner wall of the sieve barrel 306.

[0060] In this embodiment, the screening holes 307 are evenly distributed on the inner wall of the screening barrel 306 to select coal powder of qualified size, so that fine particles can pass through and be discharged, thereby achieving efficient screening function.

[0061] In a further preferred embodiment of the present invention, the output ends of the gear 303 and the second motor 305 are both fitted into the integrated groove 301, and the gear 303 and the gear ring 302 form a mutually rotating structure through the second motor 305.

[0062] In this embodiment, both gear 303 and the second motor 305 are fitted into the integrated groove 301. The second motor 305 drives gear 303 to rotate, thereby driving gear ring 302 to rotate synchronously. Gear ring 302 is connected to rotating sleeve 304, which in turn drives screening barrel 306 to rotate, realizing dynamic screening of coal powder. This transmission structure ensures stable operation of the screening assembly and improves screening efficiency and accuracy.

[0063] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0064] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

[0065] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A multi-stage pulverized coal separator with dynamic guide vanes, characterized in that, include: Mounting bracket (1); A transmission assembly mounted on the mounting frame (1), the transmission assembly being used to convey pulverized coal; A screening assembly mounted on the mounting frame (1) is used for screening coal powder of acceptable size; The threaded outlet (4) is fixedly connected to the side of the mounting bracket (1); A circulation connecting pipe (5) is fixedly connected to the end of the mounting bracket (1).

2. The multi-stage pulverized coal separator with dynamic guide vanes according to claim 1, characterized in that, The transmission assembly includes: A connecting groove (201) is provided on the side wall of the mounting frame (1). An outer pipe (202) is fixedly connected to the outer edge of one end of the connecting groove (201). A rotating groove (203) is provided on the other end of the outer pipe (202). A feed inlet (204) is connected to the top of the outer pipe (202).

3. The multi-stage pulverized coal separator with dynamic guide vanes according to claim 2, characterized in that, A rotating rod (205) is fitted inside the rotating groove (203). The rotating rod (205) is connected to the output end of the first motor (206). A spiral blade (207) is fixedly connected to the surface of the rotating rod (205).

4. The multi-stage pulverized coal separator with dynamic guide vanes according to claim 3, characterized in that, The first motor (206) is installed on the side wall of the outer pipe (202) and is fitted into the rotating groove (203).

5. The multi-stage pulverized coal separator with dynamic guide vanes according to claim 3, characterized in that, The rotating rod (205) forms a mutually rotating structure with the rotating groove (203) through the first motor (206), and the rotating rod (205) and the spiral plate (207) rotate synchronously.

6. The multi-stage pulverized coal separator with dynamic guide vanes according to claim 1, characterized in that, The screening component includes: An integrated groove (301) is formed on the side wall of the mounting frame (1). A toothed ring (302) is fitted inside the integrated groove (301). A gear (303) meshes on the surface of the toothed ring (302). One side of the toothed ring (302) is connected to a rotating sleeve (304). The other side of the gear (303) is connected to the output end of a second motor (305). A screening barrel (306) is threaded onto the rotating sleeve (304). Screening holes (307) are formed on the inner wall of the screening barrel (306).

7. The multi-stage pulverized coal separator with dynamic guide vanes according to claim 6, characterized in that, The spiral blade (207) is attached to the inner wall of the outer pipe (202) and the screening barrel (306) respectively, and the ends of the rotating rod (205) and the spiral blade (207) extend and fit into the screening barrel (306).

8. The multi-stage pulverized coal separator with dynamic guide vanes according to claim 6, characterized in that, The threaded discharge port (4) is located directly below the side surface of the screening barrel (306), and the end of the screening barrel (306) is rotatably connected to a circulation connecting pipe (5).

9. The multi-stage pulverized coal separator with dynamic guide vanes according to claim 6, characterized in that, The sieve holes (307) are provided in multiple sets, and the sieve holes (307) are distributed at equal angles and equal intervals on the inner wall of the sieve barrel (306).

10. The multi-stage pulverized coal separator with dynamic guide vanes according to claim 6, characterized in that, The output ends of the gear (303) and the second motor (305) are both fitted into the integrated groove (301), and the gear (303) and the gear ring (302) form a mutually rotating structure through the second motor (305).

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