A dual-channel burner

Abstract

The present invention belongs to the field of pulverized coal burners, and in particular relates to a dual-channel burner, comprising a mounting base arranged on the ground, a burner shell arranged on the mounting base, a combustion assembly arranged between the shell and the mounting base, a front duct fixedly arranged on the front side of the shell, a vortex blade group rotatably arranged in the front duct, a main feed pipe connected to the interior of the shell fixedly arranged on the rear side of the shell, and a secondary feed pipe connected to the interior of the shell fixedly connected to the rear side of the shell through a fixed base. A mixing mechanism for mixing two different types of coal is arranged between the shell, the secondary feed pipe and the vortex blade group. The present invention can reduce the quality gap between high-quality pulverized coal and low-quality pulverized coal during combustion, effectively solve the problem of flame instability caused by quality differences when different types of coal are mixed, and significantly improve the stability of the combustion process.

Description

Technical Field

[0001] The invention belongs to the field of pulverized coal burners, and in particular relates to a dual-channel burner. Background Art

[0002] There are five major types of coal worldwide (lignite, sub-bituminous coal, bituminous coal, lean coal, and anthracite), each with significant differences in volatile matter, calorific value, and ash melting point. To balance combustion efficiency and economic efficiency, a blended combustion of different coal types is often employed.

[0003] Before different types of coal are mixed and burned through the burner, the two different types of coal are first crushed, and then the primary air carries the coal powder through the coal distribution pipe under the action of the external pneumatic conveying system and is transported into the furnace. The coal powder is then dispersed in the furnace through the cyclone, and then combustion-supporting air is injected into the furnace through the secondary air system. Finally, it is ignited by the ignition nozzle and burned. Due to the different quality of coal types, for example, anthracite powder and lean coal are difficult to burn, the ignition points of flammable coal powder and difficult to burn coal powder are different, and the mixing is insufficient when entering the furnace, which is prone to flame instability and coking problems. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a dual-channel burner for solving the problems mentioned in the above background technology.

[0005] In order to achieve the above-mentioned objectives, the embodiments of the present application provide the following technical solutions: The present invention provides a dual-channel burner, comprising a mounting base arranged on the ground, a burner shell arranged on the mounting base, a combustion assembly arranged between the shell and the mounting base, a front duct fixedly arranged on the front side of the shell, a vortex blade group rotatably arranged in the front duct, a main feed pipe connected to the interior of the shell fixedly arranged on the rear side of the shell, and a secondary feed pipe connected to the interior of the shell fixedly connected to the rear side of the shell through a fixing base. A mixing mechanism for mixing two different types of coal is arranged between the shell, the secondary feed pipe and the vortex blade group, a smoke conveying pipe 1 and a smoke conveying pipe 2 connected to the interior of the shell and used to convey high-temperature flue gas are fixedly arranged on the outside of the shell, and a part of the pipe body section of the secondary feed pipe is fixedly arranged in the smoke conveying pipe 1. The mixing mechanism includes a driven mixing rack rotatably arranged inside the shell, the driven mixing rack divides the interior of the shell into a smoke guide chamber and a mixing chamber, the smoke conveying pipe 1 and the smoke conveying pipe 2 are both connected to the smoke guide chamber and are used to convey high-temperature smoke to drive the driven mixing rack to rotate and mix while preheating the mixing chamber, an active mixing rack is jointly arranged between the vortex blade group and the auxiliary feed pipe, and a drive component that drives the active mixing rack to rotate is provided on the rear side of the shell.

[0006] According to a favorable embodiment, an annular distribution plate with a hollow interior is fixedly provided on the inner wall of the rear side of the shell, and a plurality of strip-shaped distribution holes are evenly opened on the front side of the annular distribution plate along its circumferential direction. One end of the main feed pipe extends to the interior of the mixing chamber and is fixedly connected to the annular distribution plate, and the feed pipe is communicated with the annular distribution plate.

[0007] According to a favorable embodiment, a smoke inlet and a smoke outlet connected to the smoke guide chamber are provided on the outer side of the shell, the smoke inlet is arranged in an arc shape, one end of the first smoke delivery pipe is fixedly arranged on the outer side of the shell at the port located at the smoke inlet, and one end of the second smoke delivery pipe is fixedly arranged on the outer side of the shell at the port located at the smoke outlet.

[0008] According to an advantageous embodiment, the driven mixing frame comprises an annular isolation plate rotatably arranged inside the shell, a plurality of driven blades are evenly fixedly arranged on the outer side of the annular isolation plate along its circumferential direction, and a plurality of stirring bars are evenly fixedly arranged on the inner side of the annular isolation plate along its circumferential direction.

[0009] According to a favorable embodiment, the active mixing rack includes a rotating tube rotatably arranged on the rear side wall of the shell and having a hollow structure, one end of the rotating tube movably passes through the rear side wall of the shell and extends into the interior thereof, and the portion of the rotating tube located inside the mixing chamber is evenly provided with a plurality of mixing branch pipes, the surface of the mixing branch pipes is evenly and densely covered with discharge holes, and adjacent mixing branch pipes and stirring bars are staggered up and down.

[0010] According to an advantageous embodiment, one end of the rotating tube located inside the housing is fixedly connected to the vortex blade assembly, and one end of the auxiliary feed pipe is coaxially rotatably sleeved on the other end surface of the rotating tube.

[0011] According to a favorable embodiment, the drive assembly includes a drive motor fixedly arranged on the rear side of the fixed seat, and a connecting shaft fixedly connected to the output shaft of the drive motor is rotatably arranged on the rear side of the shell. The surface of the connecting shaft and the surface of the rotating tube are coaxially equipped with transmission gears, and the two transmission gears are engaged with each other.

[0012] According to a favorable embodiment, the combustion assembly includes a combustion tube fixedly connected to the front end of the front guide tube through a flange, an igniter is fixedly provided inside the combustion tube, and a secondary air supply pipe connected to the interior of the combustion tube is fixedly provided on the combustion tube, one end of the secondary air supply pipe is fixedly connected to a blower, and the blower is fixedly provided on the mounting base.

[0013] Compared with the prior art, the dual-channel burner provided by the embodiment of the present invention has the following beneficial effects:

[0014] 1. In the present invention, a mixing mechanism is provided and high-temperature flue gas is used to drive the driven mixing rack to rotate, thereby driving the stirring bars to fully mix the pulverized coal in the mixing chamber. At the same time, the high-temperature flue gas preheats the pulverized coal, making it easier for low-quality pulverized coal to burn, thereby improving the combustion quality of low-quality pulverized coal, thereby reducing the quality gap between high-quality pulverized coal and low-quality pulverized coal during combustion, effectively solving the problem of flame instability caused by quality differences when different types of coal are mixed, and significantly improving the stability of the combustion process.

[0015] 2. In the present invention, the active mixing rack and the driven mixing rack work together, the mixing branch pipes and the stirring bars are staggered and rotated in opposite directions, so that high-quality coal powder and low-quality coal powder are fully mixed with the primary air in the mixing chamber, avoiding low combustion efficiency or coking problems caused by uneven distribution of coal powder.

[0016] 3. In the present invention, a portion of the auxiliary feed pipe is arranged inside the smoke conveying pipe 1, so that the low-quality coal powder is preheated by the high-temperature flue gas before entering the mixing chamber. The heat conduction of the annular isolation plate further heats the coal powder in the mixing chamber. The dual preheating mechanism significantly improves the combustion efficiency of the low-quality coal powder and reduces the incomplete combustion phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a first-view stereoscopic structural diagram of the present invention.

[0018] Figure 2 This is a second perspective three-dimensional structural diagram of the present invention.

[0019] Figure 3 This is a main sectional plan view of the shell of the present invention.

[0020] Figure 4 It is a partially cutaway three-dimensional structural diagram of the shell and the combustion tube in the present invention.

[0021] Figure 5 This is a schematic diagram of the exploded structure of the internal structure of the shell in the present invention.

[0022] Figure 6 Schematic diagram of the flow path of high-temperature flue gas in the present invention.

[0023] The reference numerals in the figure are: 1. mounting base; 2. outer shell; 3. combustion assembly; 31. combustion tube; 32. igniter; 33. secondary air supply tube; 34. air blower; 4. front duct; 5. vortex blade group; 6. main feed pipe; 7. fixing base; 8. auxiliary feed pipe; 9. mixing mechanism; 91. driven mixing rack; 911. annular isolation plate; 912. driven blade; 913. stirring bar; 92. active mixing rack; 921. rotating tube; 922. mixing branch pipe; 93. driving assembly; 931. driving motor; 932. transmission gear; 10. smoke conveying duct one; 11. smoke conveying duct two; 12. smoke guide chamber; 13. mixing chamber; 14. annular distribution plate; 15. smoke inlet. DETAILED DESCRIPTION

[0024] The following is combined with Figure 1 -Attached Figure 6 This application is described in further detail.

[0025] Please refer to Figure 1 and Figure 4 A dual-channel burner includes a mounting base 1 arranged on the ground, a burner shell 2 is arranged on the mounting base 1, a combustion assembly 3 is arranged between the shell 2 and the mounting base 1, a front duct 4 is fixedly arranged on the front side of the shell 2, a vortex blade group 5 is rotatably arranged in the front duct 4, a main feed pipe 6 communicating with the interior of the shell 2 is fixedly arranged on the rear side of the shell 2, and an auxiliary feed pipe 8 communicating with the interior of the shell 2 is fixedly connected to the rear side of the shell 2 through a fixing base 7.

[0026] See Figure 1 、 Figure 2 and Figure 4 The combustion assembly 3 includes a combustion tube 31 fixedly connected to the front end of the front guide tube 4 through a flange, an igniter 32 is fixedly provided inside the combustion tube 31, and a secondary air supply pipe 33 connected to the interior of the combustion tube 31 is fixedly provided, and one end of the secondary air supply pipe 33 is fixedly connected to a blower 34, and the blower 34 is fixedly provided on the mounting base 1.

[0027] During specific operation, high-quality coal powder enters the main feed pipe 6 according to a certain proportion, and primary air is generated by an external air supply device and injected into the main feed pipe 6. The primary air injects the high-quality coal powder into the outer shell 2, and the low-quality coal powder is sent into the auxiliary feed pipe 8 according to a certain proportion and sent into the outer shell 2 through the primary air. After mixing, it enters the combustion tube 31 driven by the vortex blade group 5 and is ignited by the igniter and burned. In this process, the mixed coal powder is transported by the secondary air generated by the blower 34.

[0028] See Figure 3 、 Figure 4 and Figure 6A mixing mechanism 9 for mixing two different types of coal is commonly provided between the outer shell 2, the auxiliary feed pipe 8 and the vortex blade group 5. A smoke conveying pipe 10 and a smoke conveying pipe 2 11 are fixedly provided on the outer side of the outer shell 2 and are connected to the interior of the outer shell 2 and used to convey high-temperature flue gas. Part of the pipe body section of the auxiliary feed pipe 8 is fixedly provided in the smoke conveying pipe 1 10.

[0029] See Figure 3 、 Figure 4 and Figure 5 The mixing mechanism 9 includes a driven mixing rack 91 rotatably mounted within the housing 2. The driven mixing rack 91 includes an annular isolation plate 911 rotatably mounted within the housing 2. The annular isolation plate 911 is sealed against the front and rear inner walls of the housing 2 and is made of an alloy material with excellent thermal conductivity. The annular isolation plate 911 divides the interior of the housing 2 into a flue gas flow chamber 12 and a mixing chamber 13. Multiple driven blades 912 are uniformly fixedly mounted on the outer side of the annular isolation plate 911 along its circumference, and multiple stirring bars 913 are uniformly fixedly mounted on the inner side of the annular isolation plate 911 along its circumference.

[0030] See Figure 3 A smoke inlet 15 and a smoke outlet connected to the smoke guide chamber 12 are provided on the outside of the shell 2. The smoke inlet 15 is arranged in an arc shape, so that the smoke is injected into the smoke guide chamber 12 tangentially along the inner wall of the shell 2, thereby pushing the driven blades 912. One end of the smoke conveying pipe 10 is fixedly arranged on the outside of the shell 2 at the end of the smoke inlet 15, and one end of the smoke conveying pipe 2 11 is fixedly arranged on the outside of the shell 2 at the end of the smoke outlet. Both the smoke conveying pipe 10 and the smoke conveying pipe 2 11 are connected to the smoke guide chamber 12.

[0031] During operation, the external high-temperature flue gas passes through the smoke conveying pipe 10 and is injected into the smoke guide chamber 12 inside the shell 2 from the smoke inlet 15 outside the shell 2. Figure 6As shown, the high-temperature flue gas entering the flue gas guide chamber 12 not only drives the driven blades 912 to rotate the annular isolation plate 911, thereby driving the stirring bars 913 on the inner ring of the annular isolation plate 911 to rotate, but also stirs the pulverized coal in the mixing chamber 13, so that the two types of pulverized coal in the mixing chamber 13 are mixed with the primary air. At the same time, the high-temperature flue gas entering the flue gas guide chamber 12 not only insulates the mixing chamber 13 but also heats the annular isolation plate 911. The heat of the high-temperature flue gas is transferred to the air inside the mixing chamber 13 through the annular isolation plate 911, preheating the two types of pulverized coal therein, which is conducive to promoting the subsequent full combustion of the two types of pulverized coal. Furthermore, as the low-quality pulverized coal is injected into mixing chamber 13 through auxiliary feed pipe 8, the high-temperature flue gas within flue 10 preheats the low-quality coal as it passes through the intersection of auxiliary feed pipe 8 and flue pipe 10. This raises the temperature of the low-quality coal before it enters mixing chamber 13, further facilitating rapid and complete combustion of the low-quality coal after mixing with the high-quality coal, and improving the stability of the mixed combustion of coals of different qualities. The high-temperature combustion gas travels along flue gas guide chamber 12 and is ultimately discharged through flue pipe 2 11, which is connected to external purification equipment.

[0032] See Figure 4 、 Figure 5 An active mixing rack 92 is located between the vortex blade assembly 5 and the auxiliary feed pipe 8. This rack comprises a hollow rotating tube 921 rotatably mounted on the rear sidewall of the housing 2. One end of the rotating tube 921 extends through the rear sidewall of the housing 2 and into its interior. The portion of the rotating tube 921 located within the mixing chamber 13 is uniformly provided with multiple mixing branches 922. These branches are uniformly and densely covered with discharge holes, and adjacent mixing branches 922 are staggered vertically with the stirring bars 913. One end of the rotating tube 921 located within the housing 2 is fixedly connected to the vortex blade assembly 5, while one end of the auxiliary feed pipe is coaxially and rotatably mounted on the other end of the rotating tube 921.

[0033] See Figure 4 and Figure 5 A driving assembly 93 for driving the active mixing rack 92 to rotate is provided on the rear side of the shell 2. The driving assembly 93 includes a driving motor 931 fixedly provided on the rear side of the fixed seat 7. A connecting shaft (not shown in the figure) fixedly connected to the output shaft of the driving motor 931 is rotatably provided on the rear side of the shell 2. The surface of the connecting shaft and the surface of the rotating tube 921 are coaxially covered with a transmission gear 932, and the two transmission gears 932 are meshed with each other.

[0034] See Figure 3 、 Figure 4 and Figure 5To ensure uniform injection of high-quality pulverized coal into the interior of housing 2, a hollow annular distribution plate 14 is fixedly mounted on the rear inner wall of housing 2. Multiple strip-shaped distribution holes are uniformly formed along the circumference of the front side of annular distribution plate 14. One end of main feed pipe 6 extends into mixing chamber 13 and is fixedly connected to annular distribution plate 14. The feed pipe communicates with annular distribution plate 14. High-quality pulverized coal enters annular distribution plate 14 through the main feed pipe and is then uniformly injected into housing 2 through the strip-shaped distribution holes in annular distribution plate 14.

[0035] During operation, low-quality pulverized coal is transported from the auxiliary feed pipe and fed into the rotating pipe 921. The pulverized coal inside the rotating pipe 921 enters the mixing branch pipe 922 and is eventually discharged into the mixing chamber 13 through the discharge hole. At the same time, high-quality pulverized coal enters the mixing chamber 13 through the main feed pipe 6. The drive motor 931 controls the rotation of the connecting shaft and cooperates with the transmission gear 932 to rotate the rotating pipe 921. The rotation of the rotating pipe 921 causes the mixing branch pipe 922 to rotate in the opposite direction of the stirring bar 913. During the rotation process, not only can the low-quality pulverized coal be evenly sprinkled into the mixing chamber 13, but the mixing branch pipe 922 itself can also cooperate with the stirring bar 913 to further stir the low-quality pulverized coal and high-quality pulverized coal floating in the mixing chamber 13, so that the two types of pulverized coal are fully mixed with the primary air before being fed into the combustion pipe 31.

[0036] The rotating tube 921 can drive the vortex blade group 5 to rotate while rotating, so that the two types of coal powder mixed in the mixing chamber 13 enter the combustion tube 31 and flow to the igniter 32 for ignition with the assistance of the secondary air generated by the blower 34.

[0037] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A dual-channel burner, comprising a mounting base disposed on the ground, characterized in that: The burner housing is provided on the mounting base, and a combustion assembly is provided between the housing and the mounting base. A front conduit is fixedly provided on the front side of the housing, and a vortex blade group is rotatably provided in the front conduit. A main feed pipe communicating with the interior of the housing is fixedly provided on the rear side of the housing, and an auxiliary feed pipe communicating with the interior of the housing is fixedly connected to the rear side of the housing through a fixing base. A mixing mechanism for mixing two different types of coal is provided between the outer shell, the auxiliary feed pipe, and the vortex blade group. A first and a second smoke delivery pipe are fixedly provided on the outer side of the outer shell and communicate with the interior thereof for conveying high-temperature flue gas. A portion of the pipe body of the auxiliary feed pipe is fixedly provided in the first smoke delivery pipe. The mixing mechanism includes a driven mixing rack rotatably arranged inside the shell, the driven mixing rack divides the interior of the shell into a smoke guide chamber and a mixing chamber, the smoke delivery pipe 1 and the smoke delivery pipe 2 are both connected to the smoke guide chamber and are used to deliver high-temperature smoke to drive the driven mixing rack to rotate and mix while preheating the mixing chamber, an active mixing rack is commonly arranged between the vortex blade group and the auxiliary feed pipe, and a drive assembly that drives the active mixing rack to rotate is provided on the rear side of the shell; The driven mixing frame includes an annular isolation plate rotatably arranged inside the housing, a plurality of driven blades are evenly fixedly arranged on the outer side of the annular isolation plate along its circumferential direction, and a plurality of stirring bars are evenly fixedly arranged on the inner side of the annular isolation plate along its circumferential direction; The active mixing frame includes a rotating tube rotatably arranged on the rear side wall of the shell and having a hollow structure. One end of the rotating tube movably penetrates the rear side wall of the shell and extends into the interior thereof. The portion of the rotating tube located inside the mixing chamber is evenly provided with a plurality of mixing branch pipes. The surfaces of the mixing branch pipes are evenly and densely covered with discharge holes. Adjacent mixing branch pipes and stirring bars are staggered vertically. The driving assembly includes a driving motor fixedly arranged on the rear side of the fixing seat, and a connecting shaft fixedly connected to the output shaft of the driving motor is rotatably arranged on the rear side of the shell. The surface of the connecting shaft and the surface of the rotating tube are coaxially sleeved with transmission gears, and the two transmission gears are engaged with each other.

2. A dual-channel burner according to claim 1, characterized in that: An annular distribution plate with a hollow interior is fixedly provided on the inner wall of the rear side of the shell, and a plurality of strip distribution holes are evenly opened on the front side of the annular distribution plate along its circumferential direction. One end of the main feed pipe extends to the interior of the mixing chamber and is fixedly connected to the annular distribution plate, and the feed pipe is communicated with the annular distribution plate.

3. A dual-channel burner according to claim 1, characterized in that: A smoke inlet and a smoke outlet connected to the smoke guide chamber are provided on the outside of the shell. The smoke inlet is arranged in an arc shape. One end of the first smoke delivery pipe is fixedly arranged on the outside of the shell at the port of the smoke inlet. One end of the second smoke delivery pipe is fixedly arranged on the outside of the shell at the port of the smoke outlet.

4. A dual-channel burner according to claim 1, characterized in that: One end of the rotating tube located inside the shell is fixedly connected to the vortex blade group, and one end of the auxiliary feed pipe is coaxially rotatably sleeved on the other end surface of the rotating tube.

5. The dual-channel burner according to claim 1, characterized in that: The combustion assembly includes a combustion tube fixedly connected to the front end of the front guide tube through a flange, an igniter is fixedly provided inside the combustion tube, and a secondary air supply pipe connected to the interior of the combustion tube is fixedly provided on the combustion tube, one end of the secondary air supply pipe is fixedly connected to a blower, and the blower is fixedly provided on the mounting base.

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