Double-screw particle blanking combustion equipment

Abstract

The double-screw particle blanking combustion equipment comprises a rack, a storage bin and a spiral feeding mechanism, the spiral feeding mechanism comprises a first feeding barrel and a second feeding barrel, the second feeding barrel is arranged below the first feeding barrel and fixed to the rack, a feeding opening is formed in the lower portion of the first feeding barrel and communicated with the second feeding barrel, and the second feeding barrel is communicated with the storage bin. One end of the second feeding cylinder penetrates out of the rack to form a discharge port; a first spiral assembly is arranged in the first feeding barrel, a second spiral assembly is arranged in the second feeding barrel, and an obstacle removing device for removing fuel at the discharging port is arranged at the tail end of the second spiral assembly. The obstacle removing device which is safe, fast and convenient to remove residues is arranged at the tail end of the discharging port of the spiral feeding mechanism, the residues are synchronously removed when the device runs, the discharging port cannot be blocked by the residues, normal use of the device cannot be affected, the working efficiency of the device is effectively improved, and the failure rate of the device is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of auxiliary combustion equipment, in particular to a twin-screw particle blanking combustion equipment. Background Art

[0002] The feeding system of the combustion furnace using biomass pellets as fuel generally adopts a screw feeding method. The fuel enters the feeding pipe from the hopper, is pushed forward by the feeding screw in the feeding pipe, and is output to the furnace from the discharge end of the feeding pipe.

[0003] In the prior art, the Chinese utility model with publication number CN206377685U provides a spiral feeding device, which processes the spiral blades of the screw rod through a special process, and transports the biomass pellet fuel to the biomass burner through the outlet of the feeder, which greatly helps the continuous and stable operation of the biomass burner, and has the characteristics of uniform feeding and easy control of feeding amount; and in the prior art, the Chinese invention application with publication number CN111486444A also provides a two-stage auger for biomass combustion equipment. Although the two-stage auger adopts a stepped design, it can perform two spiral conveyings on the material, ensuring the uniform transportation of the material in the feeding mechanism.

[0004] However, after long-term use, the two screw feeders disclosed above may experience problems such as material jamming and clogging at the feeder outlet, resulting in unstable material feeding, affecting biomass combustion, and causing equipment shutdown. Therefore, the present invention provides a twin-screw pellet combustion device that can solve the above problems. Utility Model Content

[0005] The utility model provides a twin-screw particle dropping combustion equipment, including a frame, a storage bin, and a spiral feeding mechanism. The spiral feeding mechanism includes a first feeding barrel and a second feeding barrel. The second feeding barrel is arranged below the first feeding barrel and fixed on the frame. A feeding port is provided below the first feeding barrel to connect with the second feeding barrel. One end of the second feeding barrel passes through the frame to form a discharge port. A first spiral component is provided in the first feeding barrel, and a second spiral component is provided in the second feeding barrel. A clearing device for clearing fuel at the discharge port is provided at the end of the second spiral component.

[0006] Preferably, the obstacle clearing device has a connecting portion and an obstacle clearing portion, the connecting portion is connected to the end of the second screw assembly and rotates with the second screw assembly, and the obstacle clearing portion extends to the periphery of the discharge port.

[0007] Preferably, the obstacle clearing portion is parallel to the discharge port and spaced a certain distance apart.

[0008] Preferably, the spiral feeding mechanism transports the fuel from the storage bin to the combustion chamber, and a plurality of circular tubes are arranged around the discharge port to connect the combustion chamber and the interior of the frame, and the circular tubes are arranged between the discharge port and the obstacle removal part.

[0009] Preferably, the storage bin, the first feeding cylinder and the second feeding cylinder are arranged in the same vertical direction.

[0010] Preferably, a control device for controlling the spiral feeding mechanism is provided on the frame, the first spiral assembly includes a first screw and a first motor for controlling the first screw, the second spiral assembly includes a second screw and a second motor for controlling the second screw, the first motor and the second motor are electrically connected to the control device respectively, the control device includes a gear adjustment button, and the control device controls the spiral feeding mechanism through the gear adjustment button.

[0011] Preferably, the gear adjustment button includes a first gear, a second gear, a third gear and a fourth gear.

[0012] Preferably, the operating speed of the first spiral assembly is lower than the operating speed of the second spiral assembly.

[0013] Preferably, the rack further comprises a temperature protection device arranged at the bottom and electrically connected to the control device.

[0014] Preferably, the storage bin includes a manual blanking switch, which is arranged at the connection between the storage bin and the spiral feeding mechanism, and controls the supply of fuel.

[0015] Compared with the existing technology, the beneficial effects of the present invention are: by adopting a double-layer spiral feeding mechanism, and the feeding amount of the first spiral component is smaller than the feeding amount of the second spiral component, the phenomenon of backfire and smoke backflow is effectively reduced, and at the same time the spiral feeding mechanism can perform two spiral conveyings on the material, ensuring the uniform conveying of the material in the feeding mechanism; by providing a safe, fast and convenient slag removal device at the end of the discharge port of the spiral feeding mechanism, and cleaning the residue synchronously when the equipment is running, the discharge port will not be blocked by the residue, and will not affect the normal use of the equipment, effectively improving the working efficiency of the equipment and reducing the failure rate of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a front view of the utility model;

[0019] Figure 3This is a schematic diagram of the internal structure of the utility model;

[0020] Figure 4 This is a cross-sectional view of the internal structure of the utility model;

[0021] Figure 5 This is a schematic diagram of the internal structure of the present invention from another angle;

[0022] Figure 6 This is a structural diagram of the obstacle removal device of the present utility model;

[0023] Figure 7 This is another schematic diagram of the structure of the obstacle removal device of the present invention.

[0024] In the picture:

[0025] Frame (1); control device (11); temperature protection device (12); gear adjustment button (13); gear number display (14); external power interface (15); support leg (16); height adjustment device (17); storage bin (2); manual blanking switch (21); main body (22); bin cover (23); screw feeding mechanism (3); first feeding barrel (4); feeding port (41); second feeding barrel (5); discharge port (51); first screw assembly (6); first screw (61); first motor (62); second screw assembly (7); second screw (71); second motor (72); obstacle clearing device (8); connecting portion (81); obstacle clearing portion (82); round tube (9). DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] References herein to "embodiments" or "implementations" mean that a particular feature, structure, or characteristic described in connection with the embodiments or implementations may be included in at least one embodiment of the present application. The appearance of such phrases in various places in the specification does not necessarily refer to the same embodiment, nor do they constitute independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] In this specification, for convenience, words and phrases indicating orientation or positional relationships, such as "middle," "upper," "lower," "front," "back," "vertical," "horizontal," "top," "bottom," "inside," and "outside," are used to illustrate the positional relationships of constituent elements with reference to the accompanying drawings. This is merely for the purpose of facilitating the description of this specification and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present disclosure. The positional relationships of constituent elements may be appropriately changed depending on the orientation of the constituent elements being described. Therefore, the present disclosure is not limited to the words and phrases described in the specification and may be appropriately replaced depending on the circumstances.

[0029] like Figures 1 to 7 As shown, the utility model provides a twin-screw particle dropping combustion equipment, including a frame 1, a storage bin 2, and a spiral feeding mechanism 3. The spiral feeding mechanism 3 is arranged inside the frame 1 and transports the fuel in the storage bin 2 to the combustion chamber (not shown in the figure).

[0030] Among them, the spiral feeding mechanism 3 includes a first feeding drum 4 and a second feeding drum 5. The second feeding drum 5 is arranged below the first feeding drum 4 and fixed on the frame 1. A feeding port 41 is provided below the first feeding drum 4 to communicate with the second feeding drum 5. One end of the second feeding drum 5 passes through the frame 1 to form a discharge port 51. The storage bin 2, the first feeding drum 4 and the second feeding drum 5 are arranged in the same vertical direction.

[0031] The first feeding barrel 4 is provided with a first screw assembly 6, the second feeding barrel 5 is provided with a second screw assembly 7, and the end of the second screw assembly 7 is provided with a clearing device 8 for clearing the fuel at the discharge port 51. Figure 6 As shown, the obstacle removal device 8 includes a connecting portion 81 and an obstacle removal portion 82. The connecting portion 81 is connected to the end of the second screw assembly 7 and rotates synchronously with the rotation direction and speed of the second screw assembly 7 to clear the accumulated fuel around the discharge port 51 and prevent the discharge port 51 from being blocked. The obstacle removal portion 82 extends to the outer periphery of the discharge port 51 and is parallel to the discharge port 51 and spaced a certain distance apart.

[0032] In this embodiment, the obstacle removal device is a generally L-shaped lever. The shorter end of the lever forms a connecting portion 81 and is connected to the end of the second screw assembly 7. In some embodiments (not shown), the connection between the connecting portion 81 and the second screw assembly 7 can be a welding connection, a threaded connection, or any other desired connection method; the longer end of the lever forms the obstacle removal portion 82. In some embodiments (such as Figure 7The side of the obstacle removal portion 82 also has tapered triangular teeth. Compared with a flat obstacle removal portion 82, the obstacle removal portion 82 with triangular teeth is more efficient and effective in removing debris. In other embodiments (not shown), the side of the obstacle removal portion 82 can also be shaped like slender comb teeth or any other desired shape.

[0033] When the equipment needs to be operated, the user puts the fuel into the storage bin 2, and the fuel falls from the storage bin 2 into the first feeding barrel 4, is transported to the feeding port 41 through the first screw assembly 6, falls from the feeding port 41 into the second feeding barrel 5, and is then transported to the discharge port 51 through the second screw assembly 7, and falls into the combustion chamber for combustion. Since the spiral feeding mechanism 3 adopts a double-layer spiral feeding structure, and the feeding amount of the first screw assembly 6 is smaller than the feeding amount of the second screw assembly 7, this design effectively reduces the phenomenon of backfire and backsmoke. At the same time, the spiral feeding mechanism 3 can perform two spiral conveyings on the material, ensuring the uniform conveying of the material in the feeding mechanism 3; the end of the second screw assembly 7 is provided with an obstacle clearing device 8. After the fuel burns for a period of time, the residue will accumulate near the discharge port 51. At this time, the obstacle clearing device 8 will rotate with the operation of the screw assembly to clean the residue near the discharge port 51, avoid clogging of the discharge port 51, reduce the failure rate of the equipment, and improve the working efficiency of the equipment.

[0034] like Figure 3 As shown, the fuel storage bin 2 is roughly cylindrical and includes a cylindrical main body 22 and a bin cover 23 spliced ​​together by four baffles. The two baffles are fixed together with bolts. The upper end of the main body 22 has an opening. The interior of the main body 22 is used to store fuel, and the upper end of the main body 22 is covered with a bin cover 23.

[0035] In some embodiments (not shown in the figures), the main body 22 of the storage bin 2 can be integrally formed and is not limited to being spliced ​​using baffles. The portion where the main body 22 of the storage bin 2 is connected to the frame 1 is tapered and is provided with two manual drop switches 21, which control the supply of fuel. When in use, the fuel is put into the opening at the upper end of the main body 22 of the storage bin 2, and then the bin cover 23 is covered on the opening to prevent the fuel in the storage bin 2 from contacting the outside world. The manual drop switch 21 is in a normally open state during normal combustion. When the combustion needs to be paused or the drop needs to be stopped, you can choose to manually close this switch to block the falling of the granular fuel.

[0036] like Figure 2 、 Figure 3 、 Figure 4 and Figure 5As shown, the frame 1 is provided with a control device 11 for controlling the screw feeding mechanism 3. The control device 11 includes a gear adjustment button 13, a gear number display 14, and an external power supply interface 15. The control device 11 controls the screw feeding mechanism 3 through the gear adjustment button 13. The first screw assembly 6 includes a first screw 61 and a first motor 62 for controlling the first screw 61. The second screw assembly 7 includes a second screw 71 and a second motor 72 for controlling the second screw 71. The first motor 62 and the second motor 72 are respectively electrically connected to the control device 11. The first motor 62 and / or the second motor 72 are preferably low-noise motors and will not cause noise impact on the surrounding environment during operation.

[0037] When an external power source is connected via the external power interface 15 and the control device 11 is activated, the control device 11 supplies power to the first motor 62 and the second motor 72, which in turn drives the first screw 61 and the second screw 71 to operate according to a pre-programmed program for five minutes before operating according to the parameters of the gear setting. This five-minute program is intended to transfer fuel from the storage bin 2 to the combustion chamber to prepare the fuel base for combustion.

[0038] To pause or stop combustion, operate the gear adjustment button 13 to close. The first screw 61 will stop rotating, suspending the supply of fuel to the second feed barrel 5 and preventing new fuel from being supplied. The second screw 71 will continue to operate for approximately 10 minutes while the gear adjustment button 13 is closed. This is to completely clear the remaining pellet fuel in the second feed barrel 5 and prevent it from remaining there. Once all the pellet fuel has been cleared, the external power supply can be unplugged and the entire device can be stopped.

[0039] The control device 11 is also provided with an anti-stuck program to prevent the spiral feeding mechanism 3 from malfunctioning such as jamming during the rotation of the first screw 61 and the second screw 71 due to the uneven size of the granular fuel. The control device 11 will automatically start the anti-stuck program, that is, with creep and current protection functions. The control device 11 controls the first motor 62 and / or the second motor 72 to creep in a forward and reverse manner to solve the jam problem and ensure that the fuel can be normally delivered to the combustion chamber.

[0040] When the power supply device is started, the first motor 62 begins to rotate counterclockwise or clockwise at a set speed and drives the first screw 61. When the first screw 61 rotates, the fuel will intermittently drop downward along the direction of rotation of the screw 61 to meet the fuel supply of the second screw 71; the second motor 72 and the first motor 62 run synchronously and drive the second screw 71. The rotation direction of the second screw 71 is consistent with the rotation direction of the first screw 61, and rotates clockwise or counterclockwise. When the first screw 61 drops the fuel, the second screw 71 will use a rotating pushing method to transfer the fuel to the end outlet 51 of the second screw 71, so that the fuel can fall into the combustion chamber for combustion.

[0041] The gear adjustment button 13 is divided into four gears. The rotation speed and time of each gear are different and can be adjusted according to the use requirements to control the speed and time of blanking. However, the operating speed of the first screw 61 must be lower than the operating speed of the second screw 71. The specific speed is that when the first motor 62 rotates and drives the first screw 61 to rotate 0.3 turns, the second motor 72 rotates and drives the second screw 71 to rotate 1 turn. The four gears include the first gear, the second gear, the third gear and the fourth gear. The specific parameters of the gears are:

[0042] When the gear adjustment button 13 is in the first gear: the first motor 62 rotates and drives the first screw 61 to run for 1.5 seconds and then stops for 8.5 seconds; the second motor 72 rotates and drives the second screw 71 to run for 6 seconds and then stops for 4 seconds;

[0043] When the gear adjustment button 13 is in the second gear: the first motor 62 rotates and drives the first screw 61 to run for 3 seconds and then stops for 7 seconds; the second motor 72 rotates and drives the second screw 71 to run for 8 seconds and then stops for 2 seconds;

[0044] When the gear adjustment button 13 is in the third gear: the first motor 62 rotates and drives the first screw 61 to run for 4.5 seconds and then stops for 5.8 seconds; the second motor 72 rotates and drives the second screw 71 to run for 9 seconds and then stops for 1 second;

[0045] When the gear adjustment button 13 is in the fourth gear: the first motor 62 rotates and drives the first screw rod 61 to run for 6 seconds and then stops for 4 seconds, and the second motor 72 rotates and drives the second screw rod 71 to run continuously.

[0046] like Figure 3 and Figure 4As shown, the rack 1 also includes a temperature protection device 12, support legs 16, and a height adjustment device 17. The temperature protection device 12 is electrically connected to the control device 11. In this embodiment, the temperature protection device 12 is provided at the bottom of the rack 1 near the control device 11. The temperature protection device 12 is preferably a fan. When the temperature inside the rack 1 reaches 55°C, the fan starts operating, thereby achieving a cooling effect inside the rack 1.

[0047] Several circular tubes 9 are also arranged around the discharge port 51, connecting the combustion chamber and the interior of the frame 1. The circular tubes 9 are arranged between the discharge port 51 and the obstacle removal portion 82. These circular tubes 9 form a secondary combustion device. One end of the circular tube 9 is arranged outside the combustion chamber or inside the frame 1, serving as an air inlet through which cold air enters; the other end is arranged inside the combustion chamber, serving as an air outlet through which hot air is discharged, thereby achieving a secondary combustion effect. This design is to ensure that the granular fuel in the combustion chamber is fully burned. This design can prevent the flame from burning back into the interior of the frame 1 and avoiding ignition of the fuel inside the frame 1.

[0048] The technical means disclosed in the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A twin-screw pellet feeding and combustion device, comprising a frame (1), a storage bin (2), and a screw feeding mechanism (3), characterized in that: The spiral feeding mechanism (3) comprises a first feeding barrel (4) and a second feeding barrel (5); the second feeding barrel (5) is arranged below the first feeding barrel (4) and fixed on the frame (1); a feeding port (41) is provided below the first feeding barrel (4) to communicate with the second feeding barrel (5); one end of the second feeding barrel (5) passes through the frame (1) to form a discharge port (51); a first spiral assembly (6) is provided in the first feeding barrel (4), a second spiral assembly (7) is provided in the second feeding barrel (5), and a clearing device (8) for clearing fuel at the discharge port (51) is provided at the end of the second spiral assembly (7).

2. The twin-screw pellet burning equipment according to claim 1, characterized in that: The obstacle clearing device (8) comprises a connecting portion (81) and an obstacle clearing portion (82); the connecting portion (81) is connected to the end of the second screw assembly (7) and rotates along with the second screw assembly (7); and the obstacle clearing portion (82) extends to the outer periphery of the discharge port (51).

3. The twin-screw pellet burning equipment according to claim 2, characterized in that: The obstacle clearing portion (82) is parallel to the discharge port (51) and spaced at a certain distance therebetween.

4. The twin-screw pellet burning device according to claim 3, characterized in that: A plurality of circular tubes (9) are arranged around the discharge port (51) and communicate with the outside of the frame (1) and the inside of the frame (1). The circular tubes (9) are arranged between the discharge port (51) and the obstacle clearing portion (82).

5. A twin-screw pellet feeding and combustion device according to any one of claims 1 to 4, characterized in that: The storage bin (2), the first feeding cylinder (4) and the second feeding cylinder (5) are arranged in the same vertical direction.

6. A twin-screw pellet feeding and combustion device according to any one of claims 1 to 4, characterized in that: A control device (11) for controlling a spiral feeding mechanism (3) is provided on the frame (1); a first spiral assembly (6) includes a first screw (61) and a first motor (62) for controlling the first screw (61); a second spiral assembly (7) includes a second screw (71) and a second motor (72) for controlling the second screw (71); the first motor (62) and the second motor (72) are electrically connected to the control device (11), respectively; the control device (11) includes a gear adjustment button (13); and the control device (11) controls the spiral feeding mechanism (3) via the gear adjustment button (13).

7. The double-helix component particle falling combustion equipment according to claim 6, characterized in that: The gear adjustment button (13) includes a first gear, a second gear, a third gear and a fourth gear.

8. The twin-screw pellet burning equipment according to claim 7, characterized in that: The operating speed of the first spiral assembly (6) is lower than the operating speed of the second spiral assembly (7).

9. The twin-screw pellet burning equipment according to claim 1, characterized in that: The rack (1) further comprises a temperature protection device (12) arranged at the bottom, and the temperature protection device (12) is electrically connected to the control device (11).

10. The twin-screw pellet burning equipment according to claim 1, characterized in that: The storage bin (2) comprises a manual blanking switch (21), which is arranged at the connection between the storage bin (2) and the spiral feeding mechanism (3), and controls the supply of fuel.

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