Pulverized coal separation device and combustor

Abstract

The utility model relates to the technical field of W flame boilers, and provides a pulverized coal separating device and a burner, which comprise a pulverized coal concentrator, which comprises a shell, and a central bluff body and a swirl vane which are arranged in the shell; the thick pulverized coal channel is communicated with the shell; the head end of the thin pulverized coal channel is close to the pulverized coal concentrator, the head end of the thin pulverized coal channel is arranged in the thick pulverized coal channel, a thin pulverized coal receiving flaring is movably arranged at the head end of the thin pulverized coal channel, and the thin pulverized coal receiving flaring adjusts pulverized coal airflow entering the thin pulverized coal channel through movement of the thin pulverized coal receiving flaring. By adjusting the distance between the thin pulverized coal airflow inlet and the pulverized coal concentrator, the pulverized coal proportion of thin pulverized coal airflow can be flexibly adjusted within the range of 20%-40%, so that the purpose of adjusting the separation characteristic of the dense-thin pulverized coal separation device is achieved, and the adjustment requirement of flexible operation of a current power station boiler can be better met.

Description

Technical Field

[0001] The utility model relates to the technical field of W-flame boilers, and in particular to a pulverized coal separation device and a burner. Background Art

[0002] In order to make the pulverized coal burn out better and reduce NOx emissions, a pulverized coal concentration and separation device is generally used to concentrate and separate the pulverized coal to achieve pulverized coal concentration and concentration combustion. The pulverized coal concentration and concentration combustion technology is a pulverized coal combustion technology with high combustion efficiency, good stable combustion characteristics, and low nitrogen oxide emissions. It has been widely used in coal-fired power plants in my country.

[0003] However, the pulverized coal concentration separation devices in the prior art are generally fixed structures, and the separation characteristics cannot be adjusted, and cannot better meet the adjustment needs of the current flexible operation of power station boilers, such as the Chinese utility model patent with publication number CN216924344U.

[0004] There are also a few pulverized coal concentration separation devices that are movably arranged, such as the Chinese invention patent with publication number CN 111189044 A, which discloses a W-flame boiler pulverized coal airflow velocity adjustable burner and its adjustment method; the relative connection position of the thread is adjusted by manually rotating the support rod, so as to adjust the upper and lower positions of the support rod, thereby achieving the function of adjusting the pulverized coal concentration; however, this mechanism can only be adjusted when not in use, and cannot be dynamically adjusted when in working state. Utility Model Content

[0005] The utility model aims to provide a coal powder separation device and a burner to solve the above problems.

[0006] The embodiment of the utility model is realized through the following technical scheme: a coal powder separation device, including a coal powder concentrator, which includes a shell and a central blunt body and swirl blades arranged inside the shell; a concentrated coal powder channel, which is connected to the shell; a light coal powder channel whose head end is close to the coal powder concentrator and whose head end is arranged in the concentrated coal powder channel, and the head end of the light coal powder channel is movably provided with a light coal powder receiving expansion port, and the light coal powder receiving expansion port adjusts the coal powder airflow entering the light coal powder channel through its own movement.

[0007] Furthermore, the light coal powder receiving opening is expanded to be a cylindrical structure, and is sleeved inside the light coal powder channel.

[0008] Furthermore, a bell mouth is provided at one end of the light coal powder receiving expansion port close to the coal powder concentrator.

[0009] Furthermore, a first pull rod is provided, one end of which is fixedly connected to the light coal powder receiving expansion port, and the first pull rod drives the light coal powder receiving expansion port to move away from or close to the central bluff body.

[0010] Furthermore, the concentrated coal powder channel and the light coal powder channel are bifurcated structures with elbows, and the upper halves of the concentrated coal powder channel and the light coal powder channel are coaxially arranged.

[0011] Furthermore, the inner diameter of the bell mouth is d, the distance between the bell mouth and the central blunt body is H, the inner diameter of the shell is D; 0.4D<d<0.7D; 0.4D<H<1.2D.

[0012] Furthermore, the central bluff body, the swirl blades and the inner wall of the shell are formed of integral SI C ceramics; the pulverized coal receiving expansion port is integrally formed of SI C material.

[0013] Furthermore, the pulverized coal receiver is expanded into a valve, which is used to adjust the opening size of the head end of the light coal powder channel.

[0014] Furthermore, a driving rod is provided, one end of which is connected to the valve, and the other end of which is arranged outside the concentrated coal powder channel, and the driving rod is used to control the valve.

[0015] A burner comprises a coal powder separation device, a concentrated coal powder air flow outlet pipe, a concentrated coal powder air flow nozzle, a light coal powder air flow outlet pipe, a light coal powder air flow nozzle and an adjusting baffle.

[0016] The utility model has at least the following advantages and beneficial effects:

[0017] 1. A dual-channel radial pulverized coal thick and thin separation structure is adopted. By adjusting the distance between the pulverized coal airflow inlet and the pulverized coal concentrator, the pulverized coal proportion of the pulverized coal airflow can be flexibly adjusted within the range of 20% to 40%, thereby achieving the purpose of adjusting the separation characteristics of the pulverized coal thick and thin separation device.

[0018] 2. An active light coal powder receiving expansion port is provided to adjust the distance between the light coal powder airflow inlet and the coal powder concentrator. The light coal powder expansion port is provided in the light coal powder channel, so that dynamic adjustment can be achieved and adjustment can be made within the operation time, which is quick and effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of a first state of a pulverized coal separation device provided in the first embodiment;

[0021] Figure 2A schematic diagram of a second state of a pulverized coal separation device provided in the first embodiment;

[0022] Figure 3 A schematic diagram of the structure of a pulverized coal concentrator in a pulverized coal separation device provided in the first embodiment;

[0023] Figure 4 A schematic diagram of the structure of a light coal powder receiving expansion port in a coal powder separation device provided in the first embodiment;

[0024] Figure 5 A schematic diagram of the installation structure of a rib plate in a coal powder separation device provided in the first embodiment;

[0025] Figure 6 A schematic diagram of the structure of a coal powder separation device provided in the second embodiment;

[0026] Figure 7 A schematic diagram of the structure of a butterfly plate in a pulverized coal separation device provided in the second embodiment;

[0027] Icons: 1-central blunt body, 2-swirl blades, 3-rich coal powder channel, 4-shell, 5-light coal powder channel, 6-light coal powder receiving expansion, 7-bell mouth, 8-first pull rod, 9-rib plate, 10-butterfly plate, 11-driving rod, 12-sliding sleeve, 13-sliding rod, 14-sealing pipe seat, 15-driving rod. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] 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 present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Embodiment 1

[0031] like Figure 1As shown in FIG. 2 , in this embodiment, a pulverized coal separation device is mainly disclosed, including a pulverized coal concentrator, a concentrated pulverized coal channel 3 and a light pulverized coal channel 5; wherein the pulverized coal concentrator is connected to the concentrated pulverized coal channel 3, and one end of the light pulverized coal channel 5 is arranged inside the concentrated pulverized coal channel 3, and the pulverized coal airflow is formed into an outer circle of concentrated pulverized coal airflow and an inner circle of light pulverized coal airflow through the pulverized coal concentrator, wherein the concentrated pulverized coal airflow passes through the concentrated pulverized coal channel 3, and the light pulverized coal airflow passes through the light pulverized coal channel 5; the pulverized coal is concentrated and separated to realize concentrated and light pulverized coal combustion.

[0032] Specifically, Figure 3 As shown, the pulverized coal concentrator includes a shell 4 and a central bluff body 1 and swirl blades 2 arranged inside the shell 4. Figure 1 As shown, the concentrated coal powder channel 3 is connected to the shell 4; the head end of the light coal powder channel 5 is arranged inside the concentrated coal powder channel 3 and the head ends of the two are arranged coaxially, and both the concentrated coal powder channel 3 and the light coal powder channel 5 adopt a bifurcated structure with an elbow outlet; that is, Figure 1 ,2, if the concentrated coal powder channel 3 is a cylindrical cylinder, the light coal powder channel 5 is a cylindrical cylinder, and the head ends of the two are coaxially arranged, such as Figure 1 , 2, the tail ends of the two are separated to the "left" and "right" respectively to avoid interference with other components; of course, the concentrated coal powder channel 3 or the light coal powder channel 5 can be rectangular, triangular or other row shapes, as long as the head end is coaxial and the tail end is bifurcated; in addition, the head end of the light coal powder channel 5 is arranged close to the coal powder concentrator to collect the light coal powder airflow; it should also be noted that the remaining accessories of the coal powder concentrator, the light coal powder channel 5 or the concentrated coal powder channel 3 can adopt the existing technology, and must adopt the contents of the embodiment in the Chinese utility model patent with publication number CN216924344U.

[0033] In the present embodiment, a light coal powder receiving expansion port 6 is movably provided at the head end of the light coal powder channel 5, and the light coal powder receiving expansion port 6 adjusts the coal powder airflow entering the light coal powder channel 5 through its own movement; thereby, the coal powder proportion of the light coal powder airflow can be flexibly adjusted within the range of 20% to 40%, thereby achieving the purpose of adjusting the separation characteristics of the coal powder thick-thin separation device, and can better meet the adjustment needs of the current flexible operation of power station boilers.

[0034] Specifically, Figure 4 ,5, the light coal powder channel 5 and the light coal powder receiving expansion 6 are both cylindrical structures, and are sleeved inside the light coal powder channel 5; by extending or retracting the light coal powder receiving expansion 6 toward the light coal powder channel 5, the distance between the light coal powder channel 5 and the central blunt body 1 can be changed, thereby adjusting the proportion of the light coal powder airflow; further, as Figure 1As shown in Figures 2 and 4, a bell mouth 7 is provided at one end of the light coal powder receiving expansion port 6 close to the coal powder concentrator to expand the collection of the light coal powder airflow and better achieve the separation efficiency of the light coal powder and the concentrated coal powder.

[0035] For the driving device for driving the light coal powder receiving expansion mouth 6, in some embodiments, an electric telescopic rod can be used for driving. In the present embodiment, a first pull rod 8 is used for manual driving to reduce the internal structure and thus reduce the failure rate. Specifically, one end of the first pull rod 8 is fixedly connected to the light coal powder receiving expansion mouth 6, and the other end is arranged along the axial direction of the head end of the light coal powder channel 5 and extends to the outside of the light coal powder channel 5. By manually pushing and pulling the first pull rod 8, the first pull rod 8 drives the light coal powder receiving expansion mouth 6 away from or close to the central blunt body 1 to adjust the light coal powder concentration ratio; preferably, the first pull rod 8 is fixed in the light coal powder receiving expansion mouth 6 by a plurality of circumferential ribs 9, so that the pull rod and the light coal powder receiving expansion mouth 6 are fixed as a whole.

[0036] Further, the inner diameter of the bell mouth 7 is d, the distance between the bell mouth 7 and the central bluff body 1 is H, and the inner diameter of the shell 4 is D; 0.4D<d<0.7D; 0.4D<H<1.2D. The proportion of pulverized coal in the pulverized coal airflow can be flexibly adjusted within the range of 20% to 40%; In addition, in this embodiment, the central bluff body 1, the swirl blade 2 and the inner wall of the shell 4 are formed by integral SIC ceramics; the pulverized coal receiving flare 6 is integrally formed by SIC ceramics, thereby improving the wear resistance and service life; Of course, in other embodiments, rare alloys can also be used to achieve wear resistance; In addition, the angle α of the swirl blade 2 is preferably 15° to 35°, which is the most efficient; Finally, in order to ensure sealing, in this embodiment, the sealing of the first connecting rod adopts the following structure, specifically, the first pull rod 8 extends from the lower elbow of the pulverized coal channel 5 to the outside of the device, and a sealing pipe seat 14 is provided at the extension to prevent leakage of the pulverized coal airflow; the sealing pipe seat 14 adopts an existing structure, such as a rubber or spring seal.

[0037] Finally, in this embodiment, a burner is also disclosed, including the above-mentioned coal powder separation device, a concentrated coal powder airflow outlet pipe, a concentrated coal powder airflow nozzle, a light coal powder airflow outlet pipe, a light coal powder airflow nozzle and an adjusting baffle; wherein the concentrated coal powder airflow outlet pipe, the concentrated coal powder airflow nozzle, the light coal powder airflow outlet pipe, the light coal powder airflow nozzle and the adjusting baffle are existing structures, for example: the concentrated coal powder airflow outlet pipe is connected to the tail end of the concentrated coal powder channel 3, and the concentrated coal powder airflow outlet pipe is connected to the concentrated coal powder airflow nozzle; the light coal powder airflow outlet pipe is connected to the tail end of the light coal powder channel 5, and the light coal powder airflow outlet pipe is connected to the light coal powder airflow nozzle, and the adjusting baffle is arranged in the light coal powder airflow outlet to adjust the airflow.

[0038] Embodiment 2

[0039] like Figure 6 As shown, in this embodiment, a coal powder separation device is mainly disclosed, and its main structure is exactly the same as that of the first embodiment. The difference lies in that, in this embodiment, the movable structure of the light coal powder receiving expansion 6 is different. In the first embodiment, a cylindrical light coal powder receiving expansion 6 that can be adjusted at any time is mainly used to realize the size control of the light coal powder airflow. In this embodiment, the size of the light coal powder airflow is controlled by directly controlling the inlet size of the light coal powder airflow.

[0040] Specifically, the pulverized coal receiver is expanded into a valve, which is used to adjust the opening size of the head end of the light pulverized coal channel; the valve can be a butterfly valve; further, a driving rod is provided, one end of which is connected to the valve, and the other end is arranged on the outside of the rich pulverized coal channel, and the rotation of the valve is controlled by rotating the driving rod, thereby controlling the opening size; Figure 7 As shown, the driving rod 11 can be a rod; in some embodiments, the butterfly plate 10 of the butterfly valve is not completely a circular plate, and a sliding rod 13 is provided on the butterfly plate 10, and a sliding sleeve 12 is provided on the sliding rod 13. The sliding sleeve 12 connects the driving rod 11, and the butterfly plate 10 can be driven to rotate by pulling the driving rod 11 to achieve the control of the opening size; it should be noted that the head end of the light coal powder channel 5 serves as the valve body.

[0041] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A coal powder separation device, comprising: A pulverized coal concentrator comprises a shell (4) and a central bluff body (1) and swirl blades (2) arranged inside the shell (4); A concentrated coal powder channel (3) connected to the housing (4); a light coal powder channel (5) having a head end close to the coal powder concentrator and a head end arranged in the concentrated coal powder channel (3), It is characterized in that A light coal powder receiving expansion opening (6) is movably provided at the head end of the light coal powder channel (5), and the light coal powder receiving expansion opening (6) adjusts the coal powder airflow entering the light coal powder channel (5) through its own movement.

2. The pulverized coal separation device according to claim 1, characterized in that: The light coal powder receiving expansion port (6) is a cylindrical structure, and is sleeved inside the light coal powder channel (5).

3. The pulverized coal separation device according to claim 2, characterized in that: The light coal powder receiving expansion port (6) is provided with a bell mouth (7) at one end close to the coal powder concentrator.

4. The pulverized coal separation device according to claim 3, characterized in that: A first pull rod (8) is also provided, one end of which is fixedly connected to the light coal powder receiving expansion opening (6), and the first pull rod (8) drives the light coal powder receiving expansion opening (6) to move away from or close to the central bluff body (1).

5. The pulverized coal separation device according to claim 4, characterized in that: The concentrated coal powder channel (3) and the light coal powder channel (5) are bifurcated structures with elbows, and the upper halves of the concentrated coal powder channel (3) and the light coal powder channel (5) are coaxially arranged.

6. The pulverized coal separation device according to claim 5, characterized in that: The inner diameter of the bell mouth (7) is d, the distance between the bell mouth (7) and the central bluff body (1) is H, and the inner diameter of the shell (4) is D; 0.4D<d<0.7D; 0.4D<H<1.2D.

7. The pulverized coal separation device according to claim 6, characterized in that: The central bluff body (1), the swirl blades (2) and the inner wall of the shell (4) are integrally formed of SIC ceramics; the light coal powder receiving expansion opening (6) is integrally formed of SIC material.

8. The pulverized coal separation device according to claim 1, characterized in that: The pulverized coal receiver is expanded to form a valve (10) for adjusting the opening size of the head end of the pulverized coal channel (5).

9. The pulverized coal separation device according to claim 8, characterized in that: A driving rod (11) is also provided, one end of which is connected to the valve (10) and the other end of which is arranged outside the concentrated coal powder channel (3). The driving rod (11) is used to control the valve (10).

10. A burner, characterized in that: It comprises a coal powder separation device as claimed in any one of claims 1 to 9, a concentrated coal powder airflow outlet pipe, a concentrated coal powder airflow nozzle, a light coal powder airflow outlet pipe, a light coal powder airflow nozzle and an adjusting baffle.

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