A device for avoiding the burnout of a primary air cylinder of a swirl burner

Abstract

The application discloses a device for avoiding the burnout of a primary air cylinder of a swirl burner, comprising a first booster fan, a second booster fan and a main pipe; the air inlet end of the first booster fan is communicated with a hot secondary air main pipe, the air outlet end of the first booster fan is communicated with the main pipe, and the first booster fan is used for providing hot air for the main pipe; the air inlet end of the second booster fan is communicated with external air, the air outlet end of the second booster fan is communicated with the main pipe, and the second booster fan is used for providing cold air for the main pipe; and the air outlet end of the main pipe is communicated with the burner, and the main pipe is used for mixing the hot air and the cold air. The application can effectively solve the problem of the burnout of the burner central air cylinder, the combustion stabilizing tooth and the primary air cylinder caused by the insufficient cooling air volume for cooling the high-temperature entrained flue gas.

Description

Technical Field

[0001] This invention relates to the field of swirl burner cooling technology, and in particular to a device for preventing the primary air duct of a swirl burner from burning out. Background Technology

[0002] Power plant boiler burners are divided into swirl burners and once-through burners. Swirl burners divide the combustion air into four parts: primary air, inner secondary air, outer secondary air, and central air. The primary air-coal mixture first enters the burner's primary air inlet bend, then passes through the burner's primary air duct and a coal pulverizer arranged within it. The concentrator causes radial separation of the coal pulverized airflow. The concentrated coal pulverized airflow enters the annular recirculation zone from the outer circumference of the primary air duct, passes through the flame-stabilizing toothed ring at the duct outlet, and ignites. The diluted coal pulverized airflow is injected into the furnace from the central area of ​​the primary air duct and ignites in the inner recirculation zone. The burner's secondary air box provides inner and outer secondary air to operating burners and cooling air to shut-down burners. However, in current boilers, when a certain burner is shut down, insufficient cooling airflow can damage the high-temperature entrained smoke, leading to burnout of the burner's central air duct, flame-stabilizing teeth, and primary air duct.

[0003] Therefore, there is an urgent need to design a device to prevent the primary air duct of the swirl burner from burning out, in order to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a device for preventing the primary air duct of a swirl burner from burning out, comprising: a first booster fan, a second booster fan, and a main pipe;

[0005] The air inlet of the first booster fan is connected to the hot secondary air main pipe, and the air outlet of the first booster fan is connected to the main pipe. The first booster fan is used to provide hot air to the main pipe.

[0006] The air inlet of the second booster fan is connected to the outside air, and the air outlet of the second booster fan is connected to the main pipe. The second booster fan is used to provide cold air to the main pipe.

[0007] The outlet of the main pipe is connected to the burner via a pneumatic damper, and the main pipe is used to mix the hot air and the cold air.

[0008] Preferably, the main pipe includes a main pipe body, with a cold air inlet pipe and a hot air inlet pipe fixedly connected to both ends of the main pipe body, respectively. The main pipe body is connected to the second booster fan through the cold air inlet pipe, and the main pipe body is connected to the first booster fan through the hot air inlet pipe. The pneumatic damper is fixedly connected to the outside of the main pipe body and is connected to the main pipe body. A cold air diffuser is rotatably connected to the inner wall of the main pipe body near the cold air inlet pipe, and the cold air diffuser is connected to the cold air inlet pipe. A hot air diffuser is fixedly connected to the inner wall of the main pipe body near the hot air inlet pipe, and the hot air diffuser is connected to the hot air inlet pipe. The hot air diffuser is also drively connected to the cold air diffuser.

[0009] Preferably, the cold air diffuser includes a tube shaft rotatably connected to the inner wall of the main tube body, the tube shaft is connected to the cold air inlet pipe, and the tube shaft is drivenly connected to the hot air diffuser; an agitator blade is fixedly connected to the outer wall of the tube shaft, the agitator blade has a hollow structure, a plurality of air vents are provided on the agitator blade, and all the agitator blades are connected to the tube shaft.

[0010] Preferably, the hot air diffuser includes an annular pipe fixedly connected to the inner wall of the main pipe body, the annular pipe communicating with the hot air inlet pipe, and a plurality of nozzles fixedly connected to the side of the annular pipe near the pipe shaft, the plurality of nozzles communicating with the annular pipe, and the plurality of nozzles being drively connected to the pipe shaft.

[0011] Preferably, the plurality of nozzles are equidistantly distributed along the circumference, and the plurality of nozzles are all inclined, with an impeller fixed to the end of the tube shaft, and the plurality of nozzles providing power to the impeller.

[0012] Preferably, the pneumatic control valve includes a valve body, the inlet end of the valve body is fixedly connected to the outer wall of the main pipe body and communicates with the main pipe body, and the outlet end of the valve body is communicated with the burner; a valve core assembly is installed in the valve body, and an adjustment component is provided on the side of the valve core assembly away from the main pipe body, the adjustment component being used to adjust the valve core assembly.

[0013] Preferably, the valve core assembly includes a fixing block fixedly connected to the valve body, the fixing block being located on the side of the valve body's outlet end away from the main pipe body; a sliding rod is slidably connected through the fixing block, and a blocking block is fixedly connected to the side of the sliding rod near the main pipe body, the blocking block being used to block the valve body's inlet end; a first limiting plate and a second limiting plate are respectively provided on both sides of the fixing block, the first limiting plate and the second limiting plate being fixedly sleeved on the sliding rod; a spring is fixedly connected to the side of the second limiting plate away from the main pipe body, the spring being sleeved on the sliding rod, the end of the spring being fixedly connected to the adjusting component, and the end of the sliding rod away from the main pipe body being slidably connected to the adjusting component.

[0014] Preferably, the adjusting assembly includes an adjusting block slidably embedded in the inner wall of the valve body on the side away from the main pipe body, and the end of the spring is fixedly connected to the adjusting block; a groove is formed on the side of the adjusting block near the main pipe body, and the end of the slide rod away from the main pipe body is slidably connected to the groove; a screw is threadedly connected to the end of the valve body away from the main pipe body, and the end of the screw near the main pipe body is rotatably connected to the adjusting block.

[0015] The present invention discloses the following technical effects:

[0016] In operation, the first booster fan pressurizes and heats the air source provided by the hot secondary air main pipe and sends it into the main pipe body. The second booster fan pressurizes the external gas and sends it into the main pipe body. The nozzles inside the main pipe body cause the hot air to diffuse within the main pipe body and drive the impeller to rotate. When the impeller rotates, it drives the pipe shaft to rotate. The cold air diffuses along the stirring blades into the main pipe body, and the stirring of the stirring blades accelerates the formation of cooling gas. When the pressure inside the main pipe body is greater than the preload of the starter regulating spring, it pushes the sealing block, and the cooling air enters the burner along the outlet end of the valve body to cool the combustion stabilizing teeth, primary air duct, and central air duct inside the burner, preventing the high-temperature flue gas drawn into the burner from burning it. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a device for preventing the primary air duct of a swirl burner from burning out, according to the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of the main pipe and the pneumatic control valve in this invention;

[0020] Figure 3 for Figure 2 Enlarged view of A in the middle;

[0021] Figure 4 This is a schematic diagram of the agitator blade in Embodiment 2 of the present invention;

[0022] The components include: 1. Hot secondary air main pipe; 2. Electric gate valve; 3. First booster fan; 4. Second booster fan; 5. First manual gate valve; 6. Electric regulating valve; 7. Main pipe; 8. Second manual gate valve; 9. Pneumatic regulating valve; 10. Check valve; 11. Burner; 701. Cold air inlet pipe; 702. Main pipe body; 703. Pipe shaft; 704. Impeller; 705. Annular pipe; 706. Nozzle; 707. Hot air inlet pipe; 708. Agitator blades; 709. Vent hole; 710. Pressure gauge; 711. Temperature gauge; 901. Valve body; 902. Screw; 903. Sealing block; 904. Adjusting block; 905. Spring; 906. First limit plate; 907. Slide rod; 908. Fixing block; 909. Adjusting knob; 910. Second limit plate. Detailed Implementation

[0023] 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 embodiments of the present invention, and not all embodiments. 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.

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Example 1:

[0026] Reference Figure 1-3 The present invention provides a device for avoiding burnout of the primary air duct of a swirl burner, comprising: a first booster fan 3, a second booster fan 4, and a main pipe 7;

[0027] The air inlet of the first booster fan 3 is connected to the hot secondary air main pipe 1, and the air outlet of the first booster fan 3 is connected to the main pipe 7. The first booster fan 3 is used to provide hot air to the main pipe 7.

[0028] The air inlet of the second booster fan 4 is connected to the outside air, and the air outlet of the second booster fan 4 is connected to the main pipe 7. The second booster fan 4 is used to provide cold air to the main pipe 7.

[0029] The outlet of the main pipe 7 is connected to the burner 11 via a pneumatic damper 9. The main pipe 7 is used to mix hot air and cold air.

[0030] Furthermore, the first booster fan 3 is a hot air fan, and the second booster fan 4 is a cold air fan.

[0031] Furthermore, an electric gate valve 2 is installed between the first booster fan 3 and the hot secondary air duct, and the first booster fan 3 is connected to the hot secondary air duct through the electric gate valve 2.

[0032] Furthermore, the first booster fan 3 and the second booster fan 4 are connected to the main pipe 7 in sequence through the first manual gate valve 5 and the electric regulating valve 6.

[0033] Furthermore, the main pipe 7 includes a main pipe body 702, with a cold air inlet pipe 701 and a hot air inlet pipe 707 fixedly connected to both ends of the main pipe body 702. The main pipe body 702 is connected to the second booster fan 4 through the cold air inlet pipe 701 and to the first booster fan 3 through the hot air inlet pipe 707. A pneumatic damper 9 is fixedly connected to the outside of the main pipe body 702 and is connected to the main pipe body 702. A cold air diffuser is rotatably connected to the inner wall of the main pipe body 702 near the cold air inlet pipe 701 and is connected to the cold air inlet pipe 701. A hot air diffuser is fixedly connected to the inner wall of the main pipe body 702 near the hot air inlet pipe 707 and is connected to the hot air inlet pipe 707. The hot air diffuser is also connected to the cold air diffuser.

[0034] Furthermore, in order to more intuitively observe the temperature and pressure inside the main pipe body 702, a pressure gauge 710 and a temperature gauge 711 are installed on the main pipe body 702.

[0035] Furthermore, the cold air diffuser includes a tube shaft 703 rotatably connected to the inner wall of the main tube body 702. The tube shaft 703 is connected to the cold air inlet pipe 701 and is drivenly connected to the hot air diffuser. An agitator blade 708 is fixedly attached to the outer wall of the tube shaft 703. The agitator blade 708 has a hollow structure and several vent holes 709 are provided on the agitator blade 708. All agitator blades 708 are connected to the tube shaft 703.

[0036] The rotation of the tube shaft 703 drives the agitator blades 708 to rotate, which not only accelerates the mixing of hot and cold air, but also allows the cold air to diffuse more quickly within the main tube body 702 because the cold air is discharged into the main tube body 702 through several vent holes 709 on the agitator blades 708.

[0037] Furthermore, the hot air diffuser includes an annular pipe 705 fixedly connected to the inner wall of the main pipe body 702. The annular pipe 705 is connected to the hot air inlet pipe 707. Several nozzles 706 are fixedly connected to the side of the annular pipe 705 near the pipe shaft 703. The several nozzles 706 are all connected to the annular pipe 705 and are drivenly connected to the pipe shaft 703.

[0038] By setting up several nozzles 706, hot air can be sprayed out along several nozzles 706, which can better diffuse the hot air to the main pipe body 702, and allow the hot air and cold air to come into better contact and mix, thereby improving the efficiency of cooling gas formation.

[0039] Furthermore, a number of nozzles 706 are equidistantly distributed along the circumference, and all of the nozzles 706 are inclined. An impeller 704 is fixed to the end of the tube shaft 703, and the nozzles 706 provide power to the impeller 704.

[0040] When the first booster fan 3 delivers hot air to the annular pipe 705 and sprays it out from several nozzles 706 on the annular pipe 705, the airflow drives the impeller 704 to rotate. The rotation of the impeller 704 drives the pipe shaft 703 to rotate, which in turn drives the stirring blades 708 to rotate. The stirring blades 708 can accelerate the mixing of hot air and cold air, and better form cooling gas in the main pipe body 702.

[0041] Furthermore, the pneumatic control valve 9 includes a valve body 901, the air inlet end of the valve body 901 is fixedly connected to the outer wall of the main pipe body 702 and the air inlet end of the valve body 901 is connected to the main pipe body 702, and the air outlet end of the valve body 901 is connected to the burner 11; a valve core assembly is installed inside the valve body 901, and an adjustment component is provided on the side of the valve core assembly away from the main pipe body 702, the adjustment component is used to adjust the valve core assembly.

[0042] Furthermore, a second manual gate valve 8 is fixedly connected to the outer wall of the main pipe body 702, and the air inlet end of the valve body 901 is fixedly connected to the air outlet end of the second manual gate valve 8.

[0043] Furthermore, the outlet end of the valve body 901 is connected to a check valve 10, which is connected to the burner 11.

[0044] Furthermore, the valve core assembly includes a fixing block 908 fixedly connected within the valve body 901. The fixing block 908 is located on the side of the valve body 901 away from the main pipe body 702 at the outlet end. A slide rod 907 is slidably connected through the fixing block 908. A blocking block 903 is fixedly connected to the side of the slide rod 907 near the main pipe body 702. The blocking block 903 is used to block the inlet end of the valve body 901. A first limiting plate 906 and a second limiting plate 910 are respectively provided on both sides of the fixing block 908. Both the first limiting plate 906 and the second limiting plate 910 are fixedly sleeved on the slide rod 907. A spring 905 is fixedly connected to the side of the second limiting plate 910 away from the main pipe body 702. The spring 905 is sleeved on the slide rod 907. The end of the spring 905 is fixedly connected to the adjusting component, and the end of the slide rod 907 away from the main pipe body 702 is slidably connected to the adjusting component.

[0045] When the cooling gas pressure inside the main pipe body 702 is greater than the preload of the spring 905, the cooling gas pushes the sealing block 903, and the sealing block 903 releases the blockage on the air inlet end of the valve body 901. The cooling gas can then enter the burner 11 along the valve body 901 to cool it. When the pressure inside the main pipe body 702 is less than the preload of the spring 905, the sealing block 903 re-seals the air inlet end of the valve body 901 under the action of the elastic force.

[0046] Furthermore, the adjustment assembly includes an adjustment block 904 slidably embedded in the inner wall of the valve body 901 on the side away from the main pipe body 702, and the end of the spring 905 is fixedly connected to the adjustment block 904; a groove is provided on the side of the adjustment block 904 near the main pipe body 702, and the end of the slide rod 907 away from the main pipe body 702 is slidably connected in the groove; a screw rod 902 is threadedly connected to the end of the valve body 901 away from the main pipe body 702, and the end of the screw rod 902 near the main pipe body 702 is rotatably connected to the adjustment block 904.

[0047] Furthermore, to facilitate the rotation of the screw 902, an adjustment knob 909 is fixedly connected to the end of the screw 902 away from the main tube body 702.

[0048] Rotating the adjustment knob 909 causes the screw 902 to rotate. Since the valve body 901 is threadedly connected to the screw 902, rotating the screw 902 can adjust the adjustment block 904 to move closer to or further away from the main pipe body 702. In its natural state, the second limiting plate 910 is in contact with the fixing block 908. Therefore, the movement of the fixing block 908 can adjust the pre-tightening force of the spring 905, thereby adjusting the pressure of the cooling gas in the main pipe body 702. When the pressure exceeds the elastic force of the spring 905, the blocking block 903 is pushed to allow the cooling gas in the main pipe body 702 to enter the burner 11 through the outlet of the valve body 901, cooling the burner 11's combustion stabilizing teeth, primary air duct, and central air duct, preventing the high-temperature flue gas drawn into the burner 11 from burning it.

[0049] Working process: The first booster fan 3 pressurizes and heats the air source provided by the hot secondary air main pipe 1 and sends it to the main pipe body 702. The second booster fan 4 pressurizes the outside gas and sends it to the main pipe body 702. The nozzle 706 in the main pipe body 702 causes the hot air to diffuse in the main pipe body 702 and drives the impeller 704 to rotate. When the impeller 704 rotates, it drives the pipe shaft 703 to rotate. The cold air diffuses to the main pipe body 702 along the stirring blade 708. The stirring of the stirring blade 708 accelerates the formation of cooling gas. When the pressure in the main pipe body 702 is greater than the pre-pressure of the starting regulating spring 905, it pushes the sealing block 903. The cooling air enters the burner 11 along the outlet end of the valve body 901 to cool the combustion stabilizing teeth, primary air duct and central air duct in the burner 11, and avoids the high temperature flue gas drawn into the burner 11 from burning it.

[0050] Example 2:

[0051] Reference Figure 4 The difference between Example 2 and Example 1 is that the stirring blade 708 is spiral-shaped. When the spiral stirring blade 708 rotates, it can form a swirling flow, which can better move the cold air towards the nozzle 706, so that the hot air and cold air can be counteracted, and the cold air and hot air can be mixed better.

[0052] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0053] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A device for preventing burn-out of the primary air duct of a swirl burner, characterized in that, include: First booster fan (3), second booster fan (4) and main pipe (7); The air inlet of the first booster fan (3) is connected to the hot secondary air main pipe (1), and the air outlet of the first booster fan (3) is connected to the main pipe (7). The first booster fan (3) is used to provide hot air to the main pipe (7). The air inlet of the second booster fan (4) is connected to the outside air, and the air outlet of the second booster fan (4) is connected to the main pipe (7). The second booster fan (4) is used to provide cold air to the main pipe (7). The outlet of the main pipe (7) is connected to the burner (11) through a pneumatic damper (9), and the main pipe (7) is used to mix the hot air and the cold air. The main pipe (7) includes a main pipe body (702), with a cold air inlet pipe (701) and a hot air inlet pipe (707) fixedly connected to both ends of the main pipe body (702). The main pipe body (702) is connected to the second booster fan (4) through the cold air inlet pipe (701), and to the first booster fan (3) through the hot air inlet pipe (707). The pneumatic damper (9) is fixedly connected to the main pipe body (702). The outer side of the main pipe (702) is connected to the main pipe body (702); a cold air diffuser is rotatably connected to the inner wall of the main pipe body (702) near the cold air inlet pipe (701), and the cold air diffuser is connected to the cold air inlet pipe (701). A hot air diffuser is fixedly connected to the inner wall of the main pipe body (702) near the hot air inlet pipe (707), and the hot air diffuser is connected to the cold air diffuser. The cold air diffuser includes a tube shaft (703) rotatably connected to the inner wall of the main tube body (702). The tube shaft (703) is connected to the cold air inlet pipe (701) and is drivenly connected to the hot air diffuser. An agitator blade (708) is fixedly connected to the outer wall of the tube shaft (703). The agitator blade (708) has a hollow structure and is provided with several vent holes (709). All agitator blades (708) are connected to the tube shaft (703). The hot air diffuser includes an annular pipe (705) fixedly connected to the inner wall of the main pipe body (702). The annular pipe (705) is connected to the hot air inlet pipe (707). A plurality of nozzles (706) are fixedly connected to the side of the annular pipe (705) near the pipe shaft (703). The plurality of nozzles (706) are all connected to the annular pipe (705) and are drivenly connected to the pipe shaft (703). A plurality of nozzles (706) are equidistantly distributed along the circumference, and all of the nozzles (706) are inclined. An impeller (704) is fixedly connected to the end of the tube shaft (703), and the nozzles (706) provide power to the impeller (704).

2. The device for preventing burn-out of the primary air duct of a swirl burner according to claim 1, characterized in that: The pneumatic control valve (9) includes a valve body (901), the air inlet of the valve body (901) is fixedly connected to the outer wall of the main pipe body (702), and the air inlet of the valve body (901) is connected to the main pipe body (702), and the air outlet of the valve body (901) is connected to the burner (11); a valve core assembly is installed inside the valve body (901), and an adjustment component is provided on the side of the valve core assembly away from the main pipe body (702), the adjustment component being used to adjust the valve core assembly.

3. The device for preventing burn-out of the primary air duct of a swirl burner according to claim 2, characterized in that: The valve core assembly includes a fixing block (908) fixedly connected within the valve body (901). The fixing block (908) is located on the side of the valve body (901) away from the main pipe body (702) at the outlet end. A sliding rod (907) is slidably connected through the fixing block (908). A sealing block (903) is fixedly connected to the side of the sliding rod (907) near the main pipe body (702). The sealing block (903) is used to seal the inlet end of the valve body (901). A second sealing block is provided on each side of the fixing block (908). A limiting plate (906) and a second limiting plate (910) are provided. Both the first limiting plate (906) and the second limiting plate (910) are fixedly sleeved on the slide rod (907). A spring (905) is fixedly connected to the side of the second limiting plate (910) away from the main tube body (702). The spring (905) is sleeved on the slide rod (907). The end of the spring (905) is fixedly connected to the adjusting component. The end of the slide rod (907) away from the main tube body (702) is slidably connected to the adjusting component.

4. The device for preventing burn-out of the primary air duct of a swirl burner according to claim 3, characterized in that: The adjusting assembly includes an adjusting block (904) slidably embedded in the inner wall of the valve body (901) on the side away from the main pipe body (702), and the end of the spring (905) is fixedly connected to the adjusting block (904); the adjusting block (904) has a groove on the side near the main pipe body (702), and the end of the slide rod (907) away from the main pipe body (702) is slidably connected to the groove; the end of the valve body (901) away from the main pipe body (702) is threadedly connected to a screw (902), and the end of the screw (902) near the main pipe body (702) is rotatably connected to the adjusting block (904).

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