A mechanism for separating coal powder

Abstract

The utility model provides a kind of coal powder concentration and dilution separation mechanism, it includes louver mechanism and isolation baffle.Louver mechanism includes multiple pieces of separation blade with set distance, multiple pieces of separation blade rotationally and obliquely arranged in the lower part of primary air passage, the end of separation blade close to coal powder nozzle is higher than the end close to input, the coal powder airflow in primary air passage is divided into upper dense area and lower dilute area by centrifugal effect of louver mechanism, isolation baffle is arranged between louver mechanism and coal powder nozzle, isolation baffle includes inclined section and horizontal section, inclined section is located at the end of horizontal section away from coal powder nozzle, inclined section extends obliquely to the direction of dense area, and horizontal section extends along the axial direction of primary air passage.The coal powder concentration and dilution separation mechanism of the utility model can adjust the concentration and dilution separation ratio of coal powder airflow flexibly by adjusting the inclination of separation blade and isolation baffle according to the coal quality and actual combustion condition, to realize the efficient coal powder concentration and dilution separation effect.

Description

Technical Field

[0001] This utility model relates to the field of boiler combustion equipment, and in particular to a coal powder concentration separation mechanism. Background Technology

[0002] A pulverized coal burner is a device that enables pulverized coal to burn completely in a short time, generating a high-temperature vortex. Current pulverized coal burners utilize rich-lean separation combustion technology to separate the primary air and pulverized coal streams into two streams with significantly different concentrations: a rich phase and a lean phase. The rich phase stream has a higher pulverized coal concentration, which reduces the ignition heat of the pulverized coal, accelerates the chemical reaction rate, and increases the flame propagation speed, thereby improving combustion stability and efficiency. Furthermore, the low-oxygen environment in the rich phase inhibits fuel nitrogen conversion, while the low-temperature combustion in the lean phase reduces the formation of thermal NOx. However, existing pulverized coal burner technologies suffer from poor separation of the rich and lean phase streams and an inability to flexibly adjust the rich-lean separation ratio.

[0003] Therefore, it is necessary to provide a coal powder concentration separation mechanism to solve the above-mentioned technical problems. Utility Model Content

[0004] This utility model provides a coal powder concentration separation mechanism, which solves the problem in the prior art of coal powder burners that the separation effect of the two airflows of the concentrated phase and the desiccated phase is not good and the concentration-desiccation ratio cannot be flexibly adjusted by the combination of an adjustable louver mechanism and an isolation baffle.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: a coal powder concentration separation mechanism is set in a primary air channel, one end of the primary air channel is an inlet for inputting coal powder airflow, and the other end of the primary air channel is detachably connected to a coal powder nozzle, the coal powder nozzle having a nozzle orifice, and the coal powder concentration separation mechanism includes a louver mechanism and an isolation baffle set in the primary air channel;

[0006] The louver mechanism includes multiple separating blades spaced at a predetermined distance. These separating blades are rotatably and obliquely disposed in the lower part of the primary air duct. The end of each separating blade near the pulverized coal nozzle is higher than the end near the inlet. The rotation axis of each separating blade is perpendicular to the axial direction of the primary air duct. The centrifugal force of the louver mechanism divides the pulverized coal airflow in the primary air duct into an upper concentrated zone and a lower depleted zone. An isolation baffle is disposed between the louver mechanism and the pulverized coal nozzle. The isolation baffle includes an inclined section and a horizontal section. The inclined section is located at the end of the horizontal section away from the pulverized coal nozzle and extends obliquely towards the concentrated zone. The horizontal section extends along the axial direction of the primary air duct.

[0007] The primary air duct is equipped with an oxygen supply mechanism, which includes an oxygen-enriched duct and a central body.

[0008] One end of the oxygen-enriched channel is a nozzle extending through the primary air channel, located in the concentrated zone. The other end of the oxygen-enriched channel is located outside the primary air channel and connected to the oxygen evaporation device. The nozzle includes a gradually expanding section that extends outward along the axial direction of the nozzle. The inner diameter of the gradually expanding section gradually increases. The central body is adjustablely disposed within the nozzle along the axial direction of the nozzle, and an annular flow channel is formed between the central body and the inner wall of the nozzle.

[0009] In this invention, the separating blades are inclined at an angle α to the axial direction of the primary air duct, and the adjustment range of the angle α is 15° to 30°.

[0010] The multiple separating blades are positioned at different heights within the primary air duct, with the separating blades closer to the pulverized coal nozzle positioned higher than those farther from the pulverized coal nozzle.

[0011] Furthermore, the height spacing between adjacent separating blades is 1 / 5 to 1 / 3 of the height of the primary air duct.

[0012] In this invention, the inclined section is rotatably connected to the horizontal section, and the inclined section forms an angle β with the axial direction of the primary air duct. The adjustment range of the angle β is 15° to 30°.

[0013] In this invention, the length of the inclined segment is 1.5 to 2.5 times the length of the horizontal segment.

[0014] In this utility model, the two ends of the separating blade are provided with rotating shafts that are rotatably connected to the primary air duct. One end of the rotating shaft passes through the primary air duct and is connected to a control rod. The control rod is perpendicular to the rotating shaft, and the control rods connected to multiple separating blades are connected to the same drive rod.

[0015] The drive rod is slidably connected to the outer surface of the primary air duct. The drive rod is provided with multiple limiting threaded holes. The control rod is provided with an elongated hole. The screw passes through the elongated hole and connects with the limiting threaded hole. The screw is movably engaged with the elongated hole. The two ends of the drive rod are provided with fixing threaded holes. The screw is connected through the fixing threaded holes and squeezes against the primary air duct, thereby fixing the position of the drive rod.

[0016] In this invention, a V-shaped blunt body is provided inside the pulverized coal nozzle, and the thickness of the blunt body at the end near the input port is less than the thickness at the end away from the input port.

[0017] In this invention, peripheral air channels are symmetrically arranged on both sides of the pulverized coal nozzle, and the air blowing direction of the peripheral air channels is inclined towards the central axis of the pulverized coal nozzle.

[0018] The primary air duct is connected to the primary air box, and the perimeter air duct is connected to the secondary air box.

[0019] Compared with the prior art, the advantages of this utility model are as follows: the coal powder concentration separation mechanism of this utility model can flexibly adjust the concentration separation ratio of the coal powder airflow by adjusting the inclination angle of the separation blades and isolation baffles according to the coal quality and actual combustion conditions, so as to achieve a highly efficient coal powder concentration separation effect. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments are briefly introduced below. The drawings described below are only the corresponding drawings of some embodiments of this utility model.

[0021] Figure 1 This is a schematic diagram of a preferred embodiment of the coal powder concentration-degradation separation mechanism of this utility model.

[0022] Figure 2 This is a schematic diagram of the control lever and drive lever in this utility model.

[0023] Figure 3 This is a schematic diagram of the inclined section connecting the rotary adjustment component in this utility model. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] The directional terms mentioned in this utility model, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom", are only for reference to the orientation of the accompanying drawings. The directional terms used are for the purpose of explaining and understanding this utility model, and are not intended to limit this utility model.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, a connection can be a detachable connection or a connection of an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] Existing pulverized coal burners suffer from poor separation of the dense and desalinated gas streams and cannot flexibly adjust the dense-desalinated separation ratio.

[0028] The following is a preferred embodiment of a coal powder concentration-degradation separation mechanism provided by this utility model, which can solve the above-mentioned technical problems.

[0029] Please refer to Figure 1 ,in Figure 1 This is a schematic diagram of a preferred embodiment of the pulverized coal concentration-degradation mechanism of this utility model. In the figure, units with similar structures are indicated by the same reference numerals.

[0030] This embodiment provides a pulverized coal concentration separation mechanism, which is disposed within a primary air duct 11. One end of the primary air duct 11 is an inlet 111 for inputting pulverized coal airflow, and the other end of the primary air duct 11 is detachably connected to a pulverized coal nozzle 15, which has a nozzle orifice 151. The pulverized coal concentration separation mechanism includes a louver mechanism 12 and an isolation baffle 13 disposed within the primary air duct 11.

[0031] The louver mechanism 12 includes multiple separating blades 121 spaced at a predetermined distance. These blades 121 are rotatably and obliquely positioned in the lower part of the primary air duct 11. The end of each separating blade 121 near the pulverized coal nozzle 15 is higher than the end near the inlet 111. The rotation axis of the separating blades 121 is perpendicular to the axial direction of the primary air duct 11. The centrifugal force of the louver mechanism 12 divides the pulverized coal airflow within the primary air duct 11 into an upper concentrated zone and a lower depleted zone. An isolation baffle 13 is positioned between the louver mechanism 12 and the pulverized coal nozzle 15. The isolation baffle 13 includes an inclined section 131 and a horizontal section 132. The inclined section 131 is located at the end of the horizontal section 132 furthest from the pulverized coal nozzle 15. The inclined section 131 extends obliquely towards the concentrated zone, while the horizontal section 132 extends along the axial direction of the primary air duct 11. The inclined section 131 and the horizontal section 132 are rotatably connected.

[0032] An oxygenation mechanism 19 is provided on the primary air duct 11. The oxygenation mechanism 19 includes an oxygen-enriched duct 191 and a central body 192.

[0033] One end of the oxygen-enriched channel 191 is a nozzle extending through the primary air channel 11, located in the concentrated zone. The other end of the oxygen-enriched channel 191 is located outside the primary air channel 11 and is connected to the oxygen evaporation device. The nozzle includes a gradually expanding section, which is axially aligned with the nozzle and points outward. The inner diameter of the gradually expanding section gradually increases. The central body 192 is adjustablely disposed inside the nozzle along the axial direction of the nozzle. An annular flow channel is formed between the central body 192 and the inner wall of the nozzle.

[0034] Specifically, after the central body 192 is adjusted to its position within the nozzle, the oxygen supply mechanism 19 is installed. A rocker arm 193 can also be provided, but is not limited to, one end of which is rotatably connected to the central body 192 via a connecting rod, and the other end of which is rotatably connected to the primary air duct 11 and extends to the outside of the primary air duct 11. This allows the rocker arm 193 to be operated within the primary air duct 11, thereby driving the central body 192 to move. The mechanism driving the central body 192 can also be other linear drive mechanisms, cam-linkage mechanisms, etc.

[0035] The operator can adjust the size of the annular flow channel by manipulating the joystick 193 to change the position of the central body 192, thus flexibly controlling the oxygen flow rate. In this way, for different load conditions and different coal powder concentrations, the position of the central body 192 can be adjusted to achieve the best mixing effect between coal powder and oxygen flow.

[0036] In this embodiment, the tilt angle of the separating blade 121 and the inclined section 131 can be adjusted. The tilt angle of the separating blade 121 and the inclined section 131 can be adjusted according to the coal quality and actual combustion conditions to flexibly adjust the concentration-to-lean ratio of the pulverized coal airflow and achieve a highly efficient pulverized coal concentration-to-lean ratio separation effect.

[0037] In this embodiment, the separation blade 121 is tilted at an angle α with the axial direction of the primary air passage 11, and the tilt angle α is adjustable in the range of 15° to 30°.

[0038] Among them, multiple separation blades 121 are arranged at different heights in the primary air duct 11, with the separation blades 121 closer to the pulverized coal nozzle 15 being higher than those further away from the pulverized coal nozzle 15.

[0039] Furthermore, the height spacing b between adjacent separating blades 121 is 1 / 5 to 1 / 3 of the height a of the primary air duct 11.

[0040] In this embodiment, the inclined section 131 forms an angle β with the axial direction of the primary air duct 11, and the adjustment range of the angle β is 15° to 30°.

[0041] In this embodiment, the length of the inclined segment is 1.5 to 2.5 times the length of the horizontal segment 132.

[0042] Please refer to Figure 2 In this embodiment, the two ends of the separating blade 121 are provided with rotating shafts 1211 that are rotatably connected to the primary air duct 11. One end of the rotating shaft 1211 passes through the primary air duct 11 and is connected to a control rod 16, which is perpendicular to the rotating shaft 1211. The control rods 16 connected to multiple separating blades 121 are connected to the same drive rod 17. This allows the tilt angle of multiple separating blades 121 to be adjusted by operating a single drive rod 17, making adjustment convenient.

[0043] Specifically, the drive rod 17 is slidably connected to the outer surface of the primary air duct 11. A slide rail can be provided on the outer surface of the primary air duct 11, and the drive rod 17 is slidably connected to the slide rail. Preferably, the axial direction of the drive rod 17 is parallel to the line connecting the centers of the plurality of rotating shafts 1211. Fixed threaded holes 172 can be provided through both ends of the drive rod 17. Screws are connected through the fixed threaded holes 172 and pressed against the primary air duct 11 or the slide rail, thereby fixing the position of the drive rod 17.

[0044] The drive rod 17 has multiple limiting threaded holes 171, and the control rod 16 has an elongated hole 161. A screw passes through the elongated hole 161 and connects to the limiting threaded holes 171, with the screw engaging with the elongated hole 161. After passing through the elongated hole 161, the screw can connect to the limiting threaded holes 171 at different positions. This allows multiple separating blades 121 to not only adjust their tilt angles synchronously but also to adjust the tilt angle of each individual separating blade 121 individually, thus creating differences in the tilt angles of the multiple separating blades 121. For example, the tilt angle of the separating blade 121 closer to the pulverized coal nozzle 15 can be adjusted to be larger.

[0045] Please refer to Figure 3 Additionally, the two ends of the inclined section 131 can also be provided with rotating shafts 133 that are rotatably connected to the inner wall of the primary air duct 11, and one end of the rotating shaft 133 passes through the primary air duct 11 and is connected to a rotating adjustment member 18. The rotating adjustment member 18 includes an arc-shaped plate portion, on which an arc-shaped groove 181 is provided. A threaded hole can be provided on the outer surface of the primary air duct 11. A screw passes through the arc-shaped groove 181 and is threadedly connected to the threaded hole. The screw fixes the rotating adjustment member 18 to the outer surface of the primary air duct 11.

[0046] In this embodiment, a V-shaped blunt body 14 is provided inside the pulverized coal nozzle 15. The thickness of the blunt body 14 at the end near the inlet 111 is less than the thickness at the end away from the inlet 111. The blunt body 14 can form a local backflow zone in front of the pulverized coal nozzle 15, enhance the turbulence intensity of the airflow, improve the mixing degree of pulverized coal and oxygen, and further improve the combustion stability of the pulverized coal airflow.

[0047] In this embodiment, peripheral air channels 152 are symmetrically arranged on both sides of the pulverized coal nozzle 15, and the air blowing direction of the peripheral air channels 152 is inclined towards the central axis of the pulverized coal nozzle 15. The peripheral air channels 152 can supplement oxygen for pulverized coal combustion, enhance the mixing of pulverized coal and oxygen, promote complete combustion, and improve combustion efficiency.

[0048] The primary air duct 11 is connected to the primary air box, and the perimeter air duct 152 is connected to the secondary air box.

[0049] The pulverized coal concentration separation mechanism of this preferred embodiment uses multiple separating blades to guide the pulverized coal airflow at an angle, and centrifugal force to divide the pulverized coal airflow in the primary air channel into an upper concentrated zone and a lower depleted zone. Simultaneously, the concentration-to-depletion ratio of the pulverized coal airflow can be flexibly adjusted by changing the inclination angle of the separating blades and isolation baffles according to the quality of the coal used and the actual combustion conditions, achieving a highly efficient pulverized coal concentration-to-depletion separation effect.

[0050] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A coal powder concentration separation mechanism, characterized in that, The coal powder concentration separation mechanism is set in a primary air duct (11), one end of which is an inlet (111) for inputting coal powder airflow, and the other end of which is detachably connected to a coal powder nozzle (15). The coal powder nozzle (15) has a nozzle orifice (151). The coal powder concentration separation mechanism includes a louver mechanism (12) and an isolation baffle (13) set in the primary air duct (11). The louver mechanism (12) includes multiple separating blades (121) spaced at a predetermined distance. These separating blades (121) are rotatable and inclined within the lower part of the primary air duct (11). The end of each separating blade (121) near the pulverized coal nozzle (15) is higher than the end near the inlet (111). The rotation axis of each separating blade (121) is perpendicular to the axial direction of the primary air duct (11). The centrifugal force of the louver mechanism (12) propels the primary air duct (11)... The coal powder airflow inside is divided into an upper concentrated zone and a lower dilute zone. The isolation baffle (13) is disposed between the louver mechanism (12) and the coal powder nozzle (15). The isolation baffle (13) includes an inclined section (131) and a horizontal section (132). The inclined section (131) is located at the end of the horizontal section (132) away from the coal powder nozzle (15). The inclined section (131) extends inclined towards the concentrated zone, and the horizontal section (132) extends along the axial direction of the primary air channel (11). The primary air duct (11) is provided with an oxygen supply mechanism (19), which includes an oxygen-enriched duct (191) and a central body (192). One end of the oxygen-enriched channel (191) is a nozzle extending through the primary air channel (11) and located in the enrichment zone. The other end of the oxygen-enriched channel (191) is located outside the primary air channel (11) and is connected to the oxygen evaporation device. The nozzle includes a gradually expanding section that gradually increases in diameter along the axial direction of the nozzle and in the direction pointing outward. The central body (192) is adjustablely disposed inside the nozzle along the axial direction of the nozzle, and an annular flow channel is formed between the central body (192) and the inner wall of the nozzle.

2. The coal powder concentration separation mechanism according to claim 1, characterized by, The separation blade (121) is inclined at an angle α to the axial direction of the primary air passage (11), and the adjustment range of the angle α is 15° to 30°.

3. The coal powder concentration separation mechanism according to claim 1, characterized by, Multiple separation blades (121) are arranged at different heights within the primary air duct (11), with the separation blades (121) closer to the pulverized coal nozzle (15) positioned higher than those further away from the pulverized coal nozzle (15).

4. The coal powder concentration separation mechanism according to claim 3, characterized by The height spacing between adjacent separation blades (121) is 1 / 5 to 1 / 3 of the height of the primary air duct (11).

5. The coal powder concentration separation mechanism according to claim 1, wherein The inclined section (131) is rotatably connected to the horizontal section (132). The inclined section (131) is inclined at an angle β with the axial direction of the primary air duct (11). The adjustment range of the angle β is 15° to 30°.

6. The coal powder concentration separation mechanism according to claim 1, wherein The length of the inclined segment is 1.5 to 2.5 times the length of the horizontal segment (132).

7. The pulverized coal concentration separation mechanism according to claim 1, characterized in that, The two ends of the separating blade (121) are provided with rotating shafts (1211) that are rotatably connected to the primary air channel (11). One end of the rotating shaft (1211) passes through the primary air channel (11) and is connected to a control rod (16). The control rod (16) is perpendicular to the rotating shaft (1211). The control rods (16) connected to multiple separating blades (121) are connected to the same drive rod (17). The drive rod (17) is slidably connected to the outer surface of the primary air duct (11). The drive rod (17) is provided with a plurality of limiting threaded holes (171). The control rod (16) is provided with an elongated hole (161). The screw passes through the elongated hole (161) and connects with the limiting threaded hole (171). The screw is movably engaged with the elongated hole (161). The two ends of the drive rod (17) are provided with fixing threaded holes (172). The screw is connected through the fixing threaded hole (172) and squeezes the primary air duct (11) to fix the position of the drive rod (17).

8. The coal powder concentration separation mechanism according to claim 1, wherein The pulverized coal nozzle (15) is provided with a V-shaped blunt body (14), and the thickness of the blunt body (14) at the end near the inlet (111) is less than the thickness of the end away from the inlet (111).

9. The coal powder concentration separation mechanism according to claim 1, wherein The coal powder nozzle (15) is symmetrically provided with perimeter air channels (152) on both sides, and the air blowing direction of the perimeter air channels (152) is inclined towards the central axis of the coal powder nozzle (15).

10. The coal powder concentration separation mechanism according to claim 9, wherein The primary air duct (11) is connected to the primary air box, and the perimeter air duct (152) is connected to the secondary air box.

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