A bubbling fluidized bed boiler that burns biomass fuel

Abstract

This invention discloses a bubbling fluidized bed boiler for burning biomass fuel, belonging to the field of boiler technology. It includes a boiler body with a wind chamber and air ducts fixedly installed on it. This design uses a filter plate to allow the combusted slag to enter the discharge chamber. The slag preheats the airflow within the wind chamber, thus utilizing the preheated slag. The wind chamber design prevents the slag from combining with the airflow, which would affect the fluidization effect of the bed material. When slag needs to be discharged from the discharge chamber, the operator starts a motor, which drives an auger. During the auger's rotation, the slag moves towards the outside of the boiler body, achieving automatic slag discharge. This prevents the bed material from being mistakenly discharged and avoids the slag from re-contacting the airflow, thus improving the fluidization effect and enhancing the slag discharge efficiency.

Description

Technical Field

[0001] This invention relates to the field of boiler technology, and more specifically, to a bubbling fluidized bed boiler that burns biomass fuel. Background Technology

[0002] Bubbling fluidized bed boilers that burn biomass fuels are efficient, clean, and flexible combustion devices that apply bubbling fluidized bed combustion technology to biomass fuels. They play an important role in biomass energy utilization (such as power generation, heating, and combined heat and power), and are particularly suitable for small and medium-scale applications and fuel diversity needs.

[0003] A bubbling fluidized bed incinerator is a highly efficient reactor that uses aerodynamics to fluidize a bed of inert solid carrier particles (typically silica sand), creating favorable conditions for combustion by ensuring sufficient contact between reactants and air. The operation of this device relies on the uniform distribution of air within the solid particle bed, forming bubbles through specific equipment. These bubbles flow upwards within the bed, creating intense turbulence, which allows the combustion reaction to proceed rapidly and completely. Fluidized air enters from a wind chamber at the bottom of the incinerator and is distributed through an air distribution plate (usually composed of a metal plate covered with a refractory protective layer) at the top of the wind chamber and air caps installed on the air distribution plate. Because the air distribution plate forms a closed area below the bed, slag or bed material can only be discharged through lateral discharge ports at the bottom of the bed. The discharged material is cooled by a water-cooled slag cooler and collected in a hopper. This discharge structure restricts the discharge of slag or bed material; for example, slag or bed material located at the bottom is difficult to discharge naturally.

[0004] To address the aforementioned issues, some solutions have been proposed in existing technologies. For example, Chinese invention application CN119146435A discloses a bubbling fluidized bed incinerator. This device, by setting up a slag discharge trough, allows the slag or bed material produced by combustion to slide or roll along the inclined surface to the slag discharge trough near the furnace wall by gravity, enabling the slag to be self-unloaded into the slag discharge trough instead of remaining on the gas distribution plate and affecting fluidization. Although existing technologies can avoid slag remaining on the top wall of the gas distribution plate and affecting the fluidization effect to a certain extent, they still have certain limitations in practical use. Because the slag discharge trough is flush with the edge of the gas distribution plate, some of the furnace material can easily flow into the slag discharge trough during fluidization. In addition, the density of slag is generally less than that of the bed material, so the slag is generally located above the bed material, which affects the slag discharge effect. This results in a large amount of slag remaining inside the boiler. When there is too much slag in the boiler, the slag will clump together, causing uneven fluidization, resulting in localized excessively high bed temperatures, requiring boiler shutdown for maintenance, and even causing deformation of the venting plates, increasing the operating risk of the boiler and causing serious economic losses. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of this invention is to provide a bubbling fluidized bed boiler that burns biomass fuel, which can improve the ash removal effect.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A bubbling fluidized bed boiler for burning biomass fuel includes a boiler body, an air chamber fixedly installed on the boiler body, an air duct fixedly installed on the air chamber, an air distribution plate fixedly installed on the top wall of the air chamber, and air distribution holes evenly opened on the air distribution plate. A discharge assembly is provided on the boiler body.

[0008] The discharge assembly includes a discharge chamber located on the boiler body, and a filter plate is provided in the discharge chamber. A motor is fixedly installed on the boiler body, and a discharge chute communicating with the discharge chamber is provided on the boiler body. An auger fixedly connected to the output end of the motor is rotatably installed in the discharge chute, and a linkage assembly is provided on the air distribution plate.

[0009] Furthermore, the linkage component includes a rotating rod rotatably mounted on the air distribution plate, an impeller that cooperates with the air duct is fixedly mounted on the rotating rod, an agitator rod is uniformly fixedly mounted on the rotating rod, and a linkage plate that fits against the filter plate is fixedly mounted on the agitator rod. A scraper that fits against the air distribution plate is fixedly mounted on the rotating rod.

[0010] Furthermore, an annular groove is provided on the air distribution plate, and a first spring is installed between the filter plate and the annular groove. A push rod is fixedly installed on the top wall of the filter plate, and the top wall of the push rod is inclined.

[0011] Furthermore, elastic rods are uniformly fixedly installed on the side wall of the filter plate, and protrusions that cooperate with the elastic rods are uniformly fixedly installed on the side wall of the discharge trough.

[0012] Furthermore, heat-conducting rods are uniformly fixedly installed on the top wall of the discharge trough, and impact rods are uniformly fixedly installed on the rotating rod.

[0013] Furthermore, a groove is provided on the bottom wall of the air chamber to cooperate with the heat-conducting rod, and a sealing plate is slidably installed on both the inner wall and the bottom wall of the air chamber, and the sealing plate is slidably engaged with the heat-conducting rod.

[0014] Furthermore, a feed cylinder is fixedly installed on the side wall of the boiler body, and a flue is fixedly installed on the top wall of the boiler body.

[0015] Furthermore, a mixing rod is uniformly fixedly installed on the rotating rod.

[0016] Furthermore, the push rod is provided in two sets, and the two sets of push rods are symmetrically arranged around the rotating rod.

[0017] Furthermore, an annular plate for sealing the annular groove is fixedly installed on the side wall of the filter plate.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] (1) This scheme uses a filter plate, through which the slag after combustion can enter the discharge chamber. At this time, the slag can preheat the airflow in the air chamber, thus utilizing the preheating of the slag. The air chamber design can also prevent the slag from combining with the airflow, which would affect the fluidization effect of the bed material. When it is necessary to discharge the slag from the discharge chamber, the operator can start the motor, which will drive the auger to rotate. During the rotation of the auger, the slag can be moved towards the outside of the boiler body, thus achieving automatic slag discharge, avoiding the bed material from being mistakenly discharged, and also preventing the slag from contacting the airflow again and affecting the fluidization effect, thereby improving the slag discharge effect.

[0020] (2) In this scheme, the airflow enters the air chamber and the airflow drives the rotating rod to rotate through the impeller. During the rotation of the rotating rod, the bed material is stirred by the stirring rod. The air bubbles are also broken up during the rotation of the stirring rod, which further improves the combustion efficiency of the fuel. During the stirring of the bed material, the slag is also moved quickly towards the filter plate, which ensures that the slag moves quickly through the filter plate into the discharge chamber. During the rotation of the stirring rod, the linkage plate is also rotated. During the rotation of the linkage plate, large particles of bed material on the filter plate are cleaned, which ensures that the slag passes through the filter plate normally and further improves the slag discharge effect.

[0021] (3) This scheme uses the cooperation of push rod and stirring rod. The stirring rod drives the filter plate to shake up and down through the push rod. During the shaking of the filter plate, the bed material and unburned fuel on the top wall of the filter plate can move towards the top wall of the air distribution plate. During the shaking of the filter plate, the slag can also quickly pass through the side wall of the filter plate and enter the discharge chamber. During the reciprocating motion of the filter plate, the protrusion will hit the elastic rod and drive the elastic rod to shake. Then the elastic rod can transmit the vibration to the filter plate, thereby increasing the fluidity of the slag and bed material, ensuring that the slag quickly passes through the filter plate and enters the discharge chamber. During the shaking of the filter plate, the filter plate can also be prevented from being blocked, which would affect the slag passage effect and further improve the slag discharge effect. Attached Figure Description

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

[0023] Figure 2 This is a cross-sectional view of the present invention;

[0024] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0025] Figure 4 For the present invention Figure 2 Enlarged view at point B in the middle;

[0026] Figure 5 This is a combined diagram of the air distribution plate, filter plate, and annular plate of the present invention;

[0027] Figure 6 This is a combination diagram of the rotating rod, stirring rod, mixing rod, impeller, and linkage plate of the present invention;

[0028] Figure 7 This is a diagram showing the combination of the heat-conducting rod and the sealing plate of the present invention.

[0029] Explanation of the labels in the diagram:

[0030] 1. Boiler body; 2. Air chamber; 3. Air duct; 4. Air distribution plate;

[0031] 5. Discharge assembly; 501. Discharge chamber; 502. Filter plate; 503. Motor; 504. Discharge chute; 505. Screw conveyor;

[0032] 6. Linkage components; 601. Rotating rod; 602. Impeller; 603. Stirring rod; 604. Linkage plate; 605. Scraper;

[0033] 701. First spring; 702. Push rod; 703. Annular groove; 704. Elastic rod; 705. Protrusion;

[0034] 801. Heat-conducting rod; 802. Impact rod; 803. Tank body; 804. Sealing plate;

[0035] 9. Feed cylinder; 10. Smoke pipe; 11. Mixing rod; 12. Annular plate. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] Please see Figures 1 to 7 A bubbling fluidized bed boiler that burns biomass fuel includes a boiler body 1, an air chamber 2 fixedly installed on the boiler body 1, an air duct 3 fixedly installed on the air chamber 2, an air distribution plate 4 fixedly installed on the top wall of the air chamber 2, and air distribution holes evenly opened on the air distribution plate 4, and a discharge assembly 5 is provided on the boiler body 1.

[0038] The discharge assembly 5 includes a discharge chamber 501 opened on the boiler body 1, and a filter plate 502 is provided in the discharge chamber 501. A motor 503 is fixedly installed on the boiler body 1. A discharge trough 504 communicating with the discharge chamber 501 is opened on the boiler body 1. An auger 505 fixedly connected to the output end of the motor 503 is rotatably installed in the discharge trough 504. A linkage assembly 6 is provided on the air distribution plate 4.

[0039] The linkage component 6 includes a rotating rod 601 rotatably mounted on the air distribution plate 4, an impeller 602 that cooperates with the air duct 3 is fixedly mounted on the rotating rod 601, agitating rods 603 are uniformly fixedly mounted on the rotating rod 601, and a linkage plate 604 that is in contact with the filter plate 502 is fixedly mounted on the agitating rod 603. A scraper 605 that is in contact with the air distribution plate 4 is fixedly mounted on the rotating rod 601.

[0040] When in use, the bed material on the top wall of the air distribution plate 4 is preheated first, and then biomass fuel is put into the boiler. At the same time, the airflow enters the air chamber 2 through the air duct 3 and enters the bed material through the air chamber 2, thereby driving the bed material to fluidize. Then the bubbles rise, coalesce and break up in the bed material. In this area, the bed material and fuel pellets are violently mixed and tumbled. The biomass pellets entering the high-temperature bed are rapidly heated and dried, and undergo thermal decomposition, releasing a large amount of volatile combustible gas. The volatiles mix with secondary air in the suspended section or dilute phase zone above the bed and burn to form a flame. The slag after combustion can then enter the discharge chamber 501 through the filter plate 502. At this time, the slag can preheat the airflow in the air chamber 2, thus preheating the slag for utilization. The air chamber 2 is designed to prevent the slag from re-combining with the airflow and affecting the fluidization effect of the bed material. When it is necessary to discharge the slag in the discharge chamber 501, the operator can start the motor 503, which drives the auger 505 to rotate. During the rotation of the auger 505, the slag can be moved out of the boiler body 1, thereby achieving automatic slag discharge, preventing the bed material from being mistakenly discharged, and preventing the slag from re-contacting with the airflow and affecting the fluidization effect, thus improving the slag discharge effect.

[0041] As the airflow enters the wind chamber 2, it impacts the impeller 602, causing it to rotate. This rotation of the impeller 602 drives the rotating rod 601, which in turn drives the agitating rod 603. The agitating rod 603 agitates the bed material, improving fluidization and breaking up air bubbles, further enhancing fuel combustion efficiency. The rotation of the rotating rod 601 also drives the scraper 605 to rotate, which in turn... The stirring rod 603 cleans large particles of material on the top wall of the air distribution plate 4, thereby preventing large particles from clogging the air distribution holes and affecting the fluidization effect of the bed material. During the stirring of the bed material by the stirring rod 603, the slag can also be moved quickly towards the filter plate 502, thereby ensuring that the slag moves quickly through the filter plate 502 into the discharge chamber 501. At the same time, the rotation of the stirring rod 603 can drive the linkage plate 604 to rotate, and the rotation of the linkage plate 604 can clean large particles of bed material on the filter plate 502, thereby ensuring that the slag passes through the filter plate 502 normally, further improving the slag discharge effect.

[0042] like Figure 2 , Figure 4 As shown, an annular groove 703 is provided on the air distribution plate 4, and a first spring 701 is installed between the filter plate 502 and the annular groove 703. A push rod 702 is fixedly installed on the top wall of the filter plate 502, and the top wall of the push rod 702 is inclined.

[0043] Elastic rods 704 are uniformly fixedly installed on the side wall of the filter plate 502, and protrusions 705 that cooperate with the elastic rods 704 are uniformly fixedly installed on the side wall of the discharge trough 504.

[0044] By adopting the above technical solution, during the rotation of the stirring rod 603 driven by the rotating rod 601, the stirring rod 603 gradually contacts the inclined surface of the push rod 702 and applies a downward pushing force to the inclined surface of the push rod 702. Then, under the action of the pushing force, the push rod 702 moves downward, and during the downward movement of the push rod 702, it drives the filter plate 502 to move downward and squeezes the first spring 701. After the push rod 702 disengages from the stirring rod 603, the first spring 701 drives the filter plate 502 to move upward. That is, during the rotation of the stirring rod 603, the filter plate 502 can be shaken up and down. During the shaking of the filter plate 502, the bed material and unburned fuel on the top wall of the filter plate 502 can move towards the top wall of the air distribution plate 4. In addition, during the shaking of the filter plate 502, the slag can also be quickly passed through the side wall of the filter plate 502 into the discharge chamber 501, further improving the slag discharge effect.

[0045] During the reciprocating motion of the filter plate 502, the filter plate 502 drives the elastic rod 704 to move up and down. During this reciprocating motion, the protrusion 705 impacts the elastic rod 704, causing it to deform. After the elastic rod 704 disengages from the protrusion 705, it vibrates and resets under its own elastic force. This vibration is transmitted to the filter plate 502, causing it to vibrate. This vibration further vibrates the surrounding bed material and slag, increasing the fluidity of the slag and bed material. This ensures that the slag quickly passes through the filter plate 502 and enters the discharge chamber 501. In addition, the vibration of the filter plate 502 also prevents blockage, which would affect the slag passage and further improve the slag discharge effect.

[0046] like Figure 2 , Figure 3 As shown, heat-conducting rods 801 are uniformly fixedly installed on the top wall of the discharge trough 504, and impact rods 802 are uniformly fixedly installed on the rotating rod 601.

[0047] The bottom wall of the air chamber 2 is provided with a groove 803 that cooperates with the heat-conducting rod 801. The inner wall and bottom wall of the air chamber 2 are slidably installed with a sealing plate 804, and the sealing plate 804 is slidably engaged with the heat-conducting rod 801.

[0048] By adopting the above technical solution, after the slag enters the discharge chamber 501, the heat-conducting rod 801 can transfer the heat of the high-temperature slag to the air chamber 2, thereby improving the utilization effect of the slag heat. Furthermore, during the rotation of the rotating rod 601, it can also drive the impact rod 802 to rotate. During the rotation of the impact rod 802, it will impact the heat-conducting rod 801. Since the heat-conducting rod 801 is elastic and the end of the impact rod 802 away from the rotating rod 601 is inclined, the heat-conducting rod 801 deforms and vibrates after the impact. The heat-conducting rod 801 can then transmit the vibration of the impact to the bottom wall of the discharge chamber 501, thereby allowing the slag to accumulate evenly in the discharge chamber 501. This prevents the slag from accumulating directly below the filter plate 502, which would affect the slag storage capacity in the discharge chamber 501. Simultaneously, after the vibration is transmitted to the discharge chamber 501, it ensures that the slag flows normally into the discharge trough 504, further improving the slag discharge effect.

[0049] After the impact rod 802 comes into contact with the heat-conducting rod 801, the impact rod 802 will drive the heat-conducting rod 801 to swing in the tank 803. During the swinging process of the impact rod 802, the sealing plate 804 can seal the tank 803. In addition, by opening the tank 803, the swing amplitude of the heat-conducting rod 801 can be increased, thereby improving the vibration effect.

[0050] like Figure 2As shown, a feed cylinder 9 is fixedly installed on the side wall of the boiler body 1, and a flue pipe 10 is fixedly installed on the top wall of the boiler body 1.

[0051] The mixing rods 11 are uniformly fixedly installed on the rotating rod 601.

[0052] By adopting the above technical solution, when in use, the user can put fuel into the boiler body 1 through the feed cylinder 9, and the flue gas after combustion can be discharged to the outside through the flue pipe 10. In addition, during the rotation of the rotating rod 601, the mixing rod 11 can be driven to stir the volatile fuel and oxygen, thereby improving the combustion effect.

[0053] like Figure 2 , Figure 5 As shown, there are two sets of push rods 702, and the two sets of push rods 702 are symmetrically arranged around the rotating rod 601.

[0054] An annular plate 12 for sealing the annular groove 703 is fixedly installed on the side wall of the filter plate 502.

[0055] By adopting the above technical solution, during the process of the rotating rod 601 driving the filter plate 502 to move up and down reciprocally through the stirring rod 603 and the push rod 702, by symmetrically arranging two sets of push rods 702 around the rotating rod 601, the filter plate 502 can be evenly stressed, thereby preventing the filter plate 502 from getting stuck. In addition, by setting the annular plate 12, the annular groove 703 can be separated from the slag, thereby ensuring the normal movement of the filter plate 502.

[0056] Instructions for use: First, the slag after combustion can enter the discharge chamber 501 through the filter plate 502. At this time, the slag can preheat the airflow in the air chamber 2, so that the slag can be preheated and utilized. The air chamber 2 can prevent the slag from combining with the airflow again. When it is necessary to discharge the slag in the discharge chamber 501, the operator can start the motor 503. Then the motor 503 drives the auger 505 to rotate. During the rotation of the auger 505, the slag can be moved out of the boiler body 1.

[0057] Then, as the airflow enters the air chamber 2, it impacts the impeller 602, causing it to rotate. This rotation of the impeller 602 drives the rotating rod 601 to rotate, which in turn drives the agitating rod 603 to rotate. The agitating rod 603 agitates the bed material and breaks up air bubbles. The rotating rod 601 also drives the scraper 605 to rotate, which in turn agitates the air distribution plate 4. Large particles on the top wall are cleaned to prevent them from clogging the air distribution holes and affecting the fluidization effect of the bed material. During the stirring process of the stirring rod 603, the slag can also be moved quickly towards the filter plate 502, so as to ensure that the slag moves quickly through the filter plate 502 into the discharge chamber 501. At the same time, the rotation of the stirring rod 603 can drive the linkage plate 604 to rotate. During the rotation of the linkage plate 604, large particles on the filter plate 502 can be cleaned, so as to ensure that the slag passes through the filter plate 502 normally.

[0058] Furthermore, during the rotation of the rotating rod 601 driving the stirring rod 603 to rotate, the stirring rod 603 drives the filter plate 502 to move downwards and compresses the first spring 701. After the push rod 702 disengages from the stirring rod 603, the first spring 701 drives the filter plate 502 to move upwards. That is, during the rotation of the stirring rod 603, the filter plate 502 can be shaken up and down. During the shaking of the filter plate 502, the bed material and unburned fuel on the top wall of the filter plate 502 can move towards the top wall of the air distribution plate 4. During the shaking of the filter plate 502, the slag can also be quickly passed through the side wall of the filter plate 502 into the discharge chamber 501. During the reciprocating motion, the filter plate 502 drives the elastic rod 704 to move up and down repeatedly. During the reciprocating motion of the filter plate 502, the protrusion 705 will hit the elastic rod 704 and cause the elastic rod 704 to deform. After the elastic rod 704 loses contact with the protrusion 705, the elastic rod 704 will shake and reset under its own elastic force. During the shaking of the elastic rod 704, the vibration can be transmitted to the filter plate 502, causing the filter plate 502 to shake. Then, during the shaking of the filter plate 502, the bed material and slag around the filter plate 502 can shake, thereby increasing the fluidity of the slag and bed material and ensuring that the slag quickly passes through the filter plate 502 and enters the discharge chamber 501.

[0059] Finally, after the slag enters the discharge chamber 501, the heat-conducting rod 801 can transfer the heat of the high-temperature slag to the air chamber 2, thereby improving the utilization effect of the slag heat. During the rotation of the rotating rod 601, it can also drive the impact rod 802 to rotate. Then, during the rotation of the impact rod 802, it will impact the heat-conducting rod 801. Since the heat-conducting rod 801 is elastic, after the impact, the heat-conducting rod 801 will deform and vibrate. Then, the heat-conducting rod 801 can transmit the impact vibration to the bottom wall of the discharge chamber 501, so that the slag can be evenly accumulated in the discharge chamber 501, thereby avoiding the accumulation of slag directly below the filter plate 502, which would affect the slag storage capacity in the discharge chamber 501. At the same time, after the vibration is transmitted to the discharge chamber 501, it ensures that the slag flows normally into the discharge chute 504.

[0060] 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 bubbling fluidized bed boiler for burning biomass fuel, comprising a boiler body (1), characterized in that: A wind chamber (2) is fixedly installed on the boiler body (1), and a wind duct (3) is fixedly installed on the wind chamber (2). A wind distribution plate (4) is fixedly installed on the top wall of the wind chamber (2), and wind distribution holes are evenly opened on the wind distribution plate (4). A discharge assembly (5) is provided on the boiler body (1). The discharge assembly (5) includes a discharge chamber (501) opened on the boiler body (1), and a filter plate (502) is provided in the discharge chamber (501). A motor (503) is fixedly installed on the boiler body (1). A discharge trough (504) communicating with the discharge chamber (501) is opened on the boiler body (1). An auger (505) fixedly connected to the output end of the motor (503) is rotatably installed in the discharge trough (504). A linkage assembly (6) is provided on the air distribution plate (4). The linkage component (6) includes a rotating rod (601) rotatably mounted on the air distribution plate (4), an impeller (602) that cooperates with the air duct (3) is fixedly mounted on the rotating rod (601), an agitator (603) is uniformly fixedly mounted on the rotating rod (601), and a linkage plate (604) that fits against the filter plate (502) is fixedly mounted on the agitator (603), and a scraper (605) that fits against the air distribution plate (4) is fixedly mounted on the rotating rod (601). The air distribution plate (4) is provided with an annular groove (703), and a first spring (701) is installed between the filter plate (502) and the annular groove (703). A push rod (702) is fixedly installed on the top wall of the filter plate (502), and the top wall of the push rod (702) is inclined. Elastic rods (704) are uniformly fixedly installed on the side wall of the filter plate (502), and protrusions (705) that cooperate with the elastic rods (704) are uniformly fixedly installed on the side wall of the discharge trough (504). Heat-conducting rods (801) are uniformly fixedly installed on the top wall of the discharge trough (504), and impact rods (802) are uniformly fixedly installed on the rotating rod (601). The bottom wall of the air chamber (2) is provided with a groove (803) that cooperates with the heat-conducting rod (801). The inner wall and bottom wall of the air chamber (2) are slidably installed with a sealing plate (804), and the sealing plate (804) is slidably cooperated with the heat-conducting rod (801).

2. A bubbling fluidized bed boiler for burning biomass fuel according to claim 1, characterized in that: A feed cylinder (9) is fixedly installed on the side wall of the boiler body (1), and a flue pipe (10) is fixedly installed on the top wall of the boiler body (1).

3. A bubbling fluidized bed boiler for burning biomass fuel according to claim 1, characterized in that: A mixing rod (11) is uniformly fixedly installed on the rotating rod (601).

4. A bubbling fluidized bed boiler for burning biomass fuel according to claim 1, characterized in that: The push rod (702) is provided in two sets, and the two sets of push rods (702) are symmetrically arranged around the rotating rod (601).

5. A bubbling fluidized bed boiler for burning biomass fuel according to claim 1, characterized in that: An annular plate (12) for sealing the annular groove (703) is fixedly installed on the side wall of the filter plate (502).

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