A feeding device for a bubbling fluidized bed biomass boiler based on fluidized gas regulation

Abstract

This invention discloses a feeding device for a bubbling fluidized bed biomass boiler based on fluidizing gas regulation, relating to the field of fuel conveying technology. It includes a feed pipe, a feed tube, and a vertical pipe. The feed pipe is connected to the upper surface of the vertical pipe, and the feed tube is connected to the bottom end of the vertical pipe. A feeding mechanism is disposed inside the feed pipe and the vertical pipe. The feeding mechanism includes an auger rotatably connected to the inside of the feed pipe. A second rotating shaft is fixedly connected to the left end of the auger, and a first helical gear is fixedly connected to the left end of the second rotating shaft. The top end of the vertical pipe is rotatably connected to the first rotating shaft, and a second helical gear is fixedly connected to the lower end of the first rotating shaft. This invention aims to solve the problem of particles jamming together, causing arch bridges to form, ultimately leading to fuel flow interruption and a sudden influx of biomass fuel when the arch bridge collapses, affecting the stable delivery of biomass fuel.

Description

Technical Field

[0001] This invention relates to the field of fuel delivery technology, and more specifically, to a bubbling fluidized bed biomass boiler feeding device based on fluidizing gas regulation. Background Technology

[0002] The feeding device for a bubbling fluidized bed biomass boiler based on fluidizing gas regulation refers to a feeding device used in a bubbling fluidized bed boiler. It uses a variable frequency fan to inject controllable fluidizing gas into the feeding pipe. By changing the airflow speed, direction and pressure, the biomass particles are continuously, uniformly and sealed from the hopper into the bubbling bed furnace.

[0003] When transporting biomass fuel, long or flaky particles such as straw and bark in the biomass fuel are prone to interlocking, or contain a lot of powder, oil, and static electricity, causing the particles to stick together tightly, resulting in the particles jamming each other and forming an arch bridge. This eventually leads to the interruption of fuel flow. When the arch bridge collapses, a large amount of biomass fuel will suddenly rush in, affecting the stable transport of biomass fuel. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention aims to provide a bubbling fluidized bed biomass boiler feeding device based on fluidizing gas regulation, in order to solve the problem of particles jamming each other, causing arch bridges to form, which ultimately leads to interruption of fuel flow and sudden influx of biomass fuel when the arch bridges collapse, affecting the stable delivery of biomass fuel.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] A feeding device for a bubbling fluidized bed biomass boiler based on fluidizing gas regulation includes a feed pipe, a feed tube, and a vertical pipe. The feed pipe is connected to the upper surface of the vertical pipe, and the feed tube is connected to the bottom end of the vertical pipe. A feeding mechanism is disposed inside the feed pipe and the vertical pipe. The feeding mechanism includes an auger rotatably connected to the inside of the feed pipe. A second rotating shaft is fixedly connected to the left end of the auger, and a first helical gear is fixedly connected to the left end of the second rotating shaft. The top end of the inside of the vertical pipe is rotatably connected to the first rotating shaft, and a second helical gear is fixedly connected to the lower end of the first rotating shaft. An isolation chamber is fixedly connected inside the vertical pipe, and a vertical shaft is inserted inside the isolation chamber. A connecting protrusion is fixedly connected to the lower surface of the second helical gear, and a roller is rotatably connected to the surface of the connecting protrusion.

[0007] Furthermore, a first motor is fixedly connected to the right end of the feed pipe, the output shaft of the first motor is fixedly connected to the right end of the auger, a feed hopper is connected to the surface of the feed pipe, the first helical gear meshes with the second helical gear, a first spring is fixedly connected to the lower surface of the isolation chamber, a sleeve is fixedly sleeved on the surface of the vertical shaft, the lower end of the first spring is fixedly connected to the upper end of the sleeve, and multiple swing frames are rotatably connected to the surface of the vertical shaft, with rolling half wheels fixedly connected to the surface of each of the multiple swing frames.

[0008] Furthermore, multiple separating blades are fixedly connected at the connection between the feed pipe and the vertical pipe.

[0009] Furthermore, the right surface of the vertical pipe is connected to a side compartment, and the interior of the side compartment is rotatably connected to a third rotating shaft, the surface of which is fixedly connected to a sealing plate.

[0010] Furthermore, a second spring is fixedly connected to the upper surface of the sealing plate, the upper end of the second spring is fixedly connected to the inner top of the side compartment, a horizontal isolation plate is fixedly connected to the inside of the vertical pipe, and an inclined isolation plate is fixedly connected to the lower surface of the isolation compartment.

[0011] Furthermore, the right surface of the vertical pipe is connected to an air inlet duct, the inside of which is rotatably connected to a fourth rotating shaft, and the surface of the fourth rotating shaft is fixedly connected to multiple pusher blades. The rear surface of the air inlet duct is fixedly connected to a second motor, and the output shaft of the second motor is fixedly connected to the rear end of the fourth rotating shaft.

[0012] Furthermore, the air outlet of the inclined air inlet is inclined downward.

[0013] Furthermore, the right end of the feeding pipe is connected to an air inlet pipe, and a variable frequency fan is installed inside the air inlet pipe. The variable frequency fan is equipped with fan blades, and a honeycomb block is fixedly connected inside the discharge end of the feeding pipe.

[0014] Furthermore, a fifth rotating shaft is fixedly connected to the surface of the fan blades on the variable frequency fan, and multiple frames are fixedly connected to the front end of the fifth rotating shaft, with a cutting mesh fixedly connected inside the frames.

[0015] Furthermore, a guide frame is fixedly connected inside the feed pipe.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] (1) In this design, the rotating auger drives the rollers to move, compressing the vertical shaft. The first spring, in conjunction with the rollers, causes the vertical shaft to move up and down repeatedly, effectively clearing the vertical pipe and reducing the likelihood of bridging within the pipe. The vertical shaft's movement also causes the half-wheels to roll along the inner wall of the pipe, oscillating the swing frame and increasing the clearing range, further reducing the chance of bridging within the pipe.

[0018] (2) This scheme uses the pusher blades to spray the outside air at an angle downward to create an air curtain. When the biomass fuel falls to the bottom, it prevents dust and flue gas from backflowing, which would cause the high-temperature flue gas to carry sparks back to the feed pipe and ignite the dry biomass pellets. This reduces the probability of backfire and prevents the flue gas from escaping from unplanned locations and causing pollution due to increased fugitive emissions.

[0019] (3) In the process of biomass fuel injection, the honeycomb block can cut the biomass fuel and the large air vortex into small vortices, quickly restore the consistency of the biomass fuel flow direction, and prevent the airflow from continuing to move along the bend due to inertia after passing through the bend, causing the injection direction to deviate from the outlet normal and generate a deflection angle, resulting in the skewed biomass fuel being injected too thin or too thick, making it difficult to control the uniformity of the biomass fuel.

[0020] (4) When the fan blades on the variable frequency fan rotate, the cutting mesh rotates at high speed. When the biomass fuel passes by, the cutting mesh hits the biomass fuel and crushes the biomass fuel with larger particle size or length. This prevents the biomass fuel particle size or length from being larger than the holes on the honeycomb block, which would cause the holes on the honeycomb block to be blocked.

[0021] (5) In the event of a backfire explosion, this solution will generate an upward airflow inside the vertical pipe, which will cause the sealing plate to rotate upward until the sealing plate touches the lower end of the inclined isolation plate. The vertical pipe can then be isolated by the sealing plate and the horizontal isolation plate, thus blocking the backfire flow path and preventing the flame from spreading upward and igniting other biomass fuels, thereby improving the safety of biomass fuel transportation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the internal structure of the feed pipe of the present invention;

[0024] Figure 3 This is a schematic diagram of the internal structure of the feed pipe, feed tube, and vertical pipe of the present invention;

[0025] Figure 4This is a schematic diagram of the internal structure of the vertical pipe of the present invention;

[0026] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle;

[0027] Figure 6 This is a schematic diagram of the internal structure of the air inlet duct of the present invention;

[0028] Figure 7 This is a schematic diagram of the internal structure of the feed tube of the present invention.

[0029] Explanation of the labels in the diagram:

[0030] 1. Feed pipe; 2. Feed tube; 3. Vertical pipe;

[0031] 401. Feed hopper; 402. First motor; 403. Screwdriver; 404. First rotating shaft; 405. First helical gear; 406. Separating blade; 407. Second rotating shaft; 408. Vertical shaft; 409. Swing frame; 410. Rolling half-wheel; 411. Second helical gear; 412. Isolation chamber; 413. Sleeve; 414. First spring; 415. Roller; 416. Connecting protrusion; 417. Side chamber; 418. Third rotating shaft; 419. Sealing plate; 420. Second spring; 421. Horizontal isolation plate; 422. Inclined isolation plate;

[0032] 501. Air inlet duct; 502. Fourth rotating shaft; 503. Propeller blades; 504. Second motor;

[0033] 601. Material guide frame; 602. Honeycomb block; 603. Fifth rotating shaft; 604. Air inlet duct; 605. Variable frequency fan; 606. Frame; 607. Cutting mesh. Detailed Implementation

[0034] 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.

[0035] Please see Figures 1-5A feeding device for a bubbling fluidized bed biomass boiler based on fluidizing gas regulation includes a feed pipe 1, a feed pipe 2, and a vertical pipe 3. The feed pipe 1 is connected to the upper surface of the vertical pipe 3, and the feed pipe 2 is connected to the bottom end of the vertical pipe 3. A feeding mechanism is disposed inside the feed pipe 1 and the vertical pipe 3. The feeding mechanism includes an auger 403 rotatably connected to the inside of the feed pipe 1. The auger 403 can transport biomass fuel to the front end and then drop it into the vertical pipe 3.

[0036] The left end of the auger 403 is fixedly connected to a second rotating shaft 407, and the left end of the second rotating shaft 407 is fixedly connected to a first helical gear 405. The top end of the vertical pipe 3 is rotatably connected to a first rotating shaft 404, and the lower end of the first rotating shaft 404 is fixedly connected to a second helical gear 411. An isolation chamber 412 is fixedly connected inside the vertical pipe 3, and a vertical shaft 408 is inserted inside the isolation chamber 412. The vertical shaft 408 moves up and down repeatedly to unclog the vertical pipe 3. A connecting protrusion 416 is fixedly connected to the lower surface of the second helical gear 411. A roller 415 is rotatably connected to the surface of block 416. When the roller 415 moves above the vertical shaft 408, it squeezes the vertical shaft 408, causing it to move downward and reducing wear on the vertical shaft 408. A first motor 402 is fixedly connected to the right end of the feed pipe 1. The output shaft of the first motor 402 is fixedly connected to the right end of the auger 403. A feed hopper 401 is connected to the surface of the feed pipe 1. The first helical gear 405 meshes with the second helical gear 411. Power is transmitted through the cooperation of the first helical gear 405 and the second helical gear 411, thereby driving the roller 415 to move.

[0037] The lower surface of the isolation chamber 412 is fixedly connected to a first spring 414, and the surface of the vertical shaft 408 is fixedly fitted with a sleeve 413. The lower end of the first spring 414 is fixedly connected to the upper end of the sleeve 413. When the roller 415 disengages from the vertical shaft 408, the first spring 414 drives the vertical shaft 408 to move upward again. The surface of the vertical shaft 408 is rotatably connected to multiple swing frames 409. The swing frames 409 swing back and forth, which can increase the unblocking range and further reduce the probability of biomass fuel bridging inside the vertical pipe 3. The surfaces of the multiple swing frames 409 are fixedly connected to rolling half-wheels 410. When the vertical shaft 408 moves up and down, the rolling half-wheels 410 can roll back and forth on the inner wall of the vertical pipe 3, thereby driving the swing frames 409 to swing back and forth.

[0038] Multiple separating blades 406 are fixedly connected at the connection between the feed pipe 1 and the vertical pipe 3. The separating blades 406 can prevent the biomass fuel from being extruded from the auger 403 in a long strip shape, which would cause blockage of the vertical pipe 3. The right surface of the vertical pipe 3 is connected to a side chamber 417. The side chamber 417 is rotatably connected to a third rotating shaft 418. A sealing plate 419 is fixedly connected to the surface of the third rotating shaft 418. In the event of a backfire explosion, an upward airflow will be generated inside the vertical pipe 3, which will drive the sealing plate 419 to rotate upward until the sealing plate 419 abuts against the lower end of the inclined isolation plate 422. The sealing plate 419 and the horizontal isolation plate 421 can then isolate the vertical pipe 3, blocking the backfire flow path and preventing the flame from spreading upward and igniting other biomass fuels, thereby improving the safety of biomass fuel transportation.

[0039] The upper surface of the sealing plate 419 is fixedly connected to a second spring 420. The upper end of the second spring 420 is fixedly connected to the inner top of the side chamber 417. After the flame is extinguished by isolating the backfire, the sealing plate 419 can be rotated downward by the rebound of the second spring 420 to open the vertical pipe 3 for refeeding. The interior of the vertical pipe 3 is fixedly connected to a horizontal isolation plate 421, and the lower surface of the isolation chamber 412 is fixedly connected to an inclined isolation plate 422.

[0040] By adopting the above technical solution, when transporting biomass fuel, the biomass fuel enters the feed pipe 1 through the feed hopper 401, and the first motor 402 drives the auger 403 to rotate. The auger 403 then transports the biomass fuel to the front end, where it falls into the vertical pipe 3. Simultaneously, the rotation of the auger 403 drives the second rotating shaft 407 to rotate, and the power is transmitted through the engagement of the first helical gear 405 and the second helical gear 411, thereby moving the roller 415. When the roller 415 moves above the vertical shaft 408, it squeezes the vertical shaft 408, causing it to move downwards. At this time, the first spring 414 is in a stretched state. When the roller 415 disengages from above the vertical shaft 408, the first spring 414 drives the vertical shaft 408 to move upwards again until the roller 415 squeezes and pushes the vertical shaft 408 again. This repetitive motion allows the vertical shaft 408 to move up and down repeatedly, achieving the effect of clearing the vertical pipe 3 and reducing the probability of biomass fuel bridging inside the vertical pipe 3. Because the arc surface of the rolling half-wheel 410 is in contact with the inner wall of the vertical pipe 3, the rolling half-wheel 410 can roll back and forth on the inner wall of the vertical pipe 3 when the vertical shaft 408 moves up and down, thereby driving the swing frame 409 to swing back and forth, which increases the clearing range and further reduces the probability of biomass fuel bridging inside the vertical pipe 3.

[0041] like Figure 6 As shown, the right surface of the vertical pipe 3 is connected to an air inlet 501. The air inlet 501 is rotatably connected to a fourth rotating shaft 502. Multiple pusher blades 503 are fixedly connected to the surface of the fourth rotating shaft 502. The horizontally straight pusher blades 503 can push air straight into the air inlet 501, reducing the presence of eddies during air flow. The rear surface of the air inlet 501 is fixedly connected to a second motor 504. The output shaft of the second motor 504 is fixedly connected to the rear end of the fourth rotating shaft 502. The inclined air outlet of the air inlet 501 is inclined downward. When air is pushed into the air inlet 501, an air curtain is generated, which can prevent dust and flue gas from backflowing when biomass fuel falls to the bottom, reducing the probability of backfire and preventing the disorderly escape of backflowing flue gas from unplanned locations, thus increasing the concentration of fugitive emissions and causing pollution.

[0042] By adopting the above technical solution, during the process of biomass fuel falling into the vertical pipe 3, the second motor 504 drives the fourth rotating shaft 502 and multiple pusher blades 503 to rotate. The pusher blades 503 push the outside air into the vertical pipe 3, and the air is guided by the air inlet duct 501 to spray the air in an inclined downward state. The horizontal and straight pusher blades 503 can push the air straight into the air inlet duct 501, reducing the existence of eddies during air flow, thus generating an air curtain. This can prevent dust and flue gas from backflowing when the biomass fuel falls to the bottom, which would cause high-temperature flue gas to carry sparks back to the feed pipe 1 and ignite the dry biomass pellets. This reduces the probability of backfire and prevents backflowing flue gas from randomly escaping from unplanned locations, which would increase the concentration of fugitive emissions and cause pollution.

[0043] like Figure 7As shown, the right end of the feed pipe 2 is connected to an air inlet pipe 604. A variable frequency fan 605 is installed inside the air inlet pipe 604, and fan blades are mounted on the variable frequency fan 605. A honeycomb block 602 is fixedly connected inside the discharge end of the feed pipe 2. During the biomass fuel injection process, the honeycomb block 602 can quickly restore the consistency of the biomass fuel flow direction, preventing the airflow from continuing to bend due to inertia after passing through a bend, causing the injection direction to deviate from the outlet normal and generate a deflection angle. This would result in the biomass fuel being injected too thinly or too thickly, making it difficult to control the uniformity of the biomass fuel. The variable frequency fan 605... A fifth rotating shaft 603 is fixedly connected to the surface of the upper fan blade 05. Multiple frames 606 are fixedly connected to the front end of the fifth rotating shaft 603. A cutting mesh 607 is fixedly connected inside the frame 606. When biomass fuel passes through, the cutting mesh 607 hits the biomass fuel and breaks up the biomass fuel with larger particle size or length. This prevents the biomass fuel particle size or length from being larger than the holes on the honeycomb block 602, which would cause the holes on the honeycomb block 602 to be blocked. A guide frame 601 is fixedly connected inside the feed pipe 2, which can reduce dead corners and prevent the biomass fuel from accumulating in large quantities in dead corners.

[0044] By adopting the above technical solution, after the biomass fuel falls into the feed pipe 2, the variable frequency fan 605 blows the biomass fuel out of the feed pipe 2, so that the biomass fuel enters the fluidized bed. During the process of biomass fuel spraying, the honeycomb block 602 can cut the biomass fuel and the large vortex of air into small vortices, quickly restore the consistency of the flow direction of the biomass fuel, and prevent the airflow from continuing to move along the bend due to inertia after passing through the bend, causing the spray direction to deviate from the outlet normal and generate a deflection angle, resulting in the skewed biomass fuel being sprayed out too thin or too thick, making it difficult to control the uniformity of the biomass fuel.

[0045] When the fan blades on the variable frequency fan 605 rotate, they synchronously drive the fifth rotating shaft 603 to rotate, which in turn drives the cutting mesh 607 on the frame 606 to rotate at high speed. Since the cutting mesh 607 is woven from fine and tough steel wire, when biomass fuel passes by, the cutting mesh 607 hits the biomass fuel, which can break up the biomass fuel with larger particle size or length, thereby preventing the biomass fuel particle size or length from being larger than the holes on the honeycomb block 602, which would cause the holes on the honeycomb block 602 to be blocked.

[0046] Instructions for use: First, biomass fuel enters the feed pipe 1 through the feed hopper 401;

[0047] Next, the first motor 402 drives the screw conveyor 403 to rotate, and the screw conveyor 403 transports the biomass fuel to the front end and then drops it into the vertical pipe 3;

[0048] Next, the fan blades on the variable frequency fan 605 rotate and drive the cutting mesh 607 to crush the biomass fuel with larger particle size or length.

[0049] At the same time, the vertical axis 408 moves up and down repeatedly to achieve the effect of clearing the vertical pipe 3;

[0050] At the same time, the rolling half-wheel 410 rolls back and forth on the inner wall of the vertical pipe 3, driving the swing frame 409 to swing back and forth;

[0051] Finally, the biomass fuel is blown out of the feed pipe 2 by the variable frequency fan 605, so that the biomass fuel enters the fluidized bed.

[0052] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A feeding device for a bubbling fluidized bed biomass boiler based on fluidizing gas regulation, comprising a feed pipe (1), a feed tube (2), and a vertical pipe (3), wherein the feed pipe (1) is connected to the upper surface of the vertical pipe (3), and the feed tube (2) is connected to the bottom end of the vertical pipe (3), characterized in that: The feeding mechanism is located inside the feed pipe (1) and the vertical pipe (3). The feeding mechanism includes an auger (403) rotatably connected to the inside of the feed pipe (1). A second rotating shaft (407) is fixedly connected to the left end of the auger (403). A first helical gear (405) is fixedly connected to the left end of the second rotating shaft (407). A first rotating shaft (404) is rotatably connected to the top end of the inside of the vertical pipe (3). The lower end of the first rotating shaft (404) is fixed. A second helical gear (411) is connected to the vertical pipe (3), and an isolation chamber (412) is fixedly connected inside the vertical pipe (3). A vertical shaft (408) is inserted inside the isolation chamber (412). A connecting protrusion (416) is fixedly connected to the lower surface of the second helical gear (411), and a roller (415) is rotatably connected to the surface of the connecting protrusion (416). The first helical gear (405) meshes with the second helical gear (411), and the lower surface of the isolation chamber (412) is connected to the vertical pipe (3). A first spring (414) is fixedly connected to the surface of the vertical shaft (408), and a sleeve (413) is fixedly fitted on the surface of the vertical shaft (408). The lower end of the first spring (414) is fixedly connected to the upper end of the sleeve (413). Multiple swing frames (409) are rotatably connected to the surface of the vertical shaft (408), and rolling half wheels (410) are fixedly connected to the surface of each of the multiple swing frames (409). The right surface of the vertical pipe (3) is connected to a side compartment (417). A third rotating shaft (418) is rotatably connected to the inside of the side compartment (417). A sealing plate (419) is fixedly connected to the surface of the third rotating shaft (418). A second spring (420) is fixedly connected to the upper surface of the sealing plate (419). The upper end of the second spring (420) is fixedly connected to the top end of the inside of the side compartment (417). A transverse isolation plate (421) is fixedly connected to the inside of the vertical pipe (3). An inclined isolation plate (422) is fixedly connected to the lower surface of the isolation compartment (412). The right surface of the vertical pipe (3) is connected to an air inlet (501), and the inside of the air inlet (501) is rotatably connected to a fourth rotating shaft (502). Multiple pusher blades (503) are fixedly connected to the surface of the fourth rotating shaft (502). The right end of the feeding pipe (2) is connected to an air inlet pipe (604). A variable frequency fan (605) is installed inside the air inlet pipe (604). A fan blade is installed on the variable frequency fan (605). A honeycomb block (602) is fixedly connected inside the discharge end of the feeding pipe (2). A fifth rotating shaft (603) is fixedly connected to the surface of the fan blade on the variable frequency fan (605). Multiple frames (606) are fixedly connected to the front end of the fifth rotating shaft (603). A cutting mesh (607) is fixedly connected inside the frame (606). A guide frame (601) is fixedly connected inside the feeding pipe (2).

2. The feeding device for a bubbling fluidized bed biomass boiler based on fluidizing gas regulation according to claim 1, characterized in that: The right end of the feed pipe (1) is fixedly connected to a first motor (402), the output shaft of the first motor (402) is fixedly connected to the right end of the auger (403), and the surface of the feed pipe (1) is connected to a feed hopper (401).

3. The feeding device for a bubbling fluidized bed biomass boiler based on fluidizing gas regulation according to claim 1, characterized in that: Multiple separating blades (406) are fixedly connected at the connection between the feed pipe (1) and the vertical pipe (3).

4. The feeding device for a bubbling fluidized bed biomass boiler based on fluidizing gas regulation according to claim 1, characterized in that: The rear surface of the air inlet duct (501) is fixedly connected to a second motor (504), and the output shaft of the second motor (504) is fixedly connected to the rear end of the fourth rotating shaft (502).

5. The feeding device for a bubbling fluidized bed biomass boiler based on fluidizing gas regulation according to claim 1, characterized in that: The air outlet of the inlet duct (501) is inclined and set downwards.

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