Bubbling fluidized bed boiler for combusting biomass fuel

Abstract

The invention discloses a bubbling fluidized bed boiler for burning biomass fuel, and belongs to the technical field of boilers, the bubbling fluidized bed boiler comprises a boiler body, an air chamber is fixedly mounted on the boiler body, and an air pipe is fixedly mounted on the air chamber. According to the scheme, through the filter plate, burnt slag can enter the discharge chamber through the filter plate, the slag can preliminarily heat airflow in the air chamber at the moment, so that the slag can be preheated and utilized, the arrangement of the air chamber can prevent the slag from being combined with the airflow to influence the fluidization effect of bed materials, and when the slag in the discharge chamber needs to be discharged, the slag can be conveniently discharged. A user can start the motor, then the motor drives the auger to rotate, slag can be driven to move out of the boiler body in the auger rotating process, and therefore automatic slag discharging can be achieved, bed materials are prevented from being discharged by mistake, the situation that the slag makes contact with airflow again, and the fluidization effect is affected can be avoided, and the slag discharging effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of boilers, and more particularly to a bubbling fluidized bed boiler for burning biomass fuel. BACKGROUND

[0002] The bubbling fluidized bed boiler for burning biomass fuel is a high-efficiency, clean and flexible combustion device that applies the bubbling fluidized bed combustion technology to biomass fuel. It plays an important role in the utilization of biomass energy (such as power generation, heating, and cogeneration), and is particularly suitable for small and medium-scale applications and fuel diversity requirements.

[0003] The bubbling fluidized bed incinerator is a high-efficiency reaction device that creates favorable conditions for the combustion of reactants and air by air power to drive the bed layer of inert solid carrier particles (typical carriers such as quartz sand) to flow, so that the combustion reaction can be carried out quickly and fully. The operation of this device relies on the uniform distribution of air in the solid particle bed, the formation of bubbles through a specific device, and the upward flow of bubbles in the solid particle bed to form turbulent flow, so that the combustion reaction can be carried out quickly and fully. The fluidized air enters from the air chamber at the bottom of the incinerator, is distributed through the air distribution plate (usually composed of a metal plate covered with a refractory protective layer) at the top of the air chamber and the air cap installed on the air distribution plate. Since the air distribution plate forms a closed area below the bed layer, the slag or bed material can only be discharged laterally through the discharge port at the bottom of the bed layer. The discharged material is cooled by a water-cooled slag cooler and then collected in a hopper. This discharge structure limits the discharge of slag or bed material, for example, the slag or bed material at the bottom is difficult to discharge naturally.

[0004] To solve the above problems, some solutions are provided in the prior art. For example, the bubbling fluidized bed incinerator disclosed in Chinese Patent Application No. CN119146435A sets up a slag discharge groove, so that the slag or bed material generated by combustion can slide or roll along the slope to the slag discharge groove near the wall, allowing the slag to be discharged into the slag discharge groove instead of staying on the air distribution plate and affecting fluidization. Although the prior art can to some extent avoid the slag staying on the top wall of the air distribution plate and affecting the fluidization effect, there are still some limitations in actual use. Since the slag discharge groove is flush with the edge of the air distribution plate, part of the slag may flow into the slag discharge groove during fluidization. In addition, the density of the slag is generally less than that of the bed material, so that the slag is generally located above the bed material, thereby affecting the discharge effect of the slag, resulting in a large amount of slag staying inside the boiler. When there is too much slag in the boiler, the slag will clump, causing uneven fluidization and local overheating of the bed temperature, which requires shutdown and maintenance, and even causes deformation of the air distribution plate, increasing the risk of use of the boiler and causing serious economic losses. SUMMARY

[0005] In view of the problems existing in the prior art, the object of the present invention is to provide a bubbling fluidized bed boiler burning biomass fuel, which can achieve the purpose of improving the slagging effect.

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

[0007] A bubbling fluidized bed boiler for burning biomass fuel comprises a boiler body, a wind chamber fixedly mounted on the boiler body, an air duct fixedly mounted on the wind chamber, an air distribution plate fixedly mounted on the top wall of the wind chamber, and air distribution holes evenly formed on the air distribution plate, and a discharge assembly provided on the boiler body;

[0008] The discharge assembly includes a discharge chamber opened on the boiler body, and a filter plate is provided in the discharge chamber, a motor is fixedly installed on the boiler body, a discharge trough connected to the discharge chamber is opened on the boiler body, an auger fixedly connected to the output end of the motor is rotatably installed in the discharge trough, and a linkage assembly is provided on the air distribution plate.

[0009] Furthermore, the linkage assembly includes a rotating rod rotatably mounted on the air distribution plate, a wheel that cooperates with the air duct is fixedly mounted on the rotating rod, a stirring rod is evenly fixedly mounted on the rotating rod, and a linkage plate that fits the filter plate is fixedly mounted on the stirring rod, and a scraper that fits the air distribution plate is fixedly mounted on the rotating rod.

[0010] Furthermore, an annular groove is provided on the air distribution plate, 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 an inclined surface.

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

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

[0013] Furthermore, a groove body cooperating with the heat conducting rod is opened on the bottom wall of the air chamber, and a blocking plate is slidably mounted on the inner wall and the bottom wall of the air chamber, and the blocking plate is slidably matched with the heat conducting rod.

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

[0015] Furthermore, mixing rods are evenly and fixedly mounted on the rotating rods.

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

[0017] Further, the side wall of the filter plate is fixedly provided with an annular plate for plugging the annular groove.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] (1) In this scheme, the filter plate is used, and the slag after combustion can pass through the filter plate into the discharge chamber. At this time, the slag can preliminarily heat the airflow in the air chamber, so that the preheating of the slag can be utilized. The setting of the air chamber can avoid the combination of the slag and the airflow, and affect the fluidization effect of the bed material. When it is necessary to discharge the slag in the discharge chamber, the user can start the motor, and then the motor drives the auger to rotate. In the process of rotating the auger, the slag can be moved outward to the boiler body, so that automatic slagging can be realized, the bed material can be prevented from being misdischarged, and the slag can be prevented from contacting the airflow again to affect the fluidization effect, thereby improving the slagging effect.

[0020] (2) In this scheme, the stirring rod is used. In the process of the airflow entering the air chamber, the airflow drives the rotating rod to rotate through the impeller, and in the process of rotating the rotating rod, the bed material is stirred through the stirring rod. Then, in the process of rotating the stirring rod, the air bubbles can be dispersed, so that the combustion efficiency of the fuel is further improved. In the process of stirring the bed material by the stirring rod, the slag can be quickly moved to the filter plate, so that the slag can be quickly moved to the discharge chamber through the filter plate. In the process of rotating the stirring rod, the linkage plate can be rotated, and in the process of rotating the linkage plate, the large-particle bed material on the filter plate can be cleaned, so that the slag can normally pass through the filter plate, and the slagging effect is further improved.

[0021] (3) In this scheme, the push rod and the stirring rod are matched. The stirring rod drives the filter plate to shake up and down through the push rod. In the process of shaking the filter plate, the bed material on the top wall of the filter plate and the fuel that is not fully combusted can be moved to the top wall of the air distribution plate. In the process of shaking the filter plate, the slag can be quickly moved to the discharge chamber through the side wall of the filter plate. In the process of reciprocating the filter plate up and down, the convex block can hit the elastic rod and drive the elastic rod to shake. Then, the elastic rod can transmit the vibration to the filter plate, so that the flowability of the slag and the bed material is increased, the slag can be quickly moved to the discharge chamber through the filter plate, and in the process of shaking the filter plate, the filter plate can be prevented from being blocked, so that the slag passing effect is affected, and the slagging effect is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic view of the present application;

[0023] Figure 2 is a sectional view of the present application;

[0024] Figure 3 is an enlarged view of A in the present application Figure 2 ;

[0025] Figure 4 For the invention Figure 2 Enlarged view at B;

[0026] Figure 5 For the invention air distribution plate, filter plate, ring plate combination;

[0027] Figure 6 For the invention of the combination of the rod, stirring rod, mixing rod, impeller, linkage plate;

[0028] Figure 7 For the invention of the combination of the heat conduction rod, blocking plate.

[0029] Explanation of figure mark:

[0030] 1, boiler body; 2, air chamber; 3, air pipe; 4, air distribution plate;

[0031] 5, discharge assembly; 501, discharge chamber; 502, filter plate; 503, motor; 504, discharge groove; 505, auger;

[0032] 6, linkage assembly; 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 conduction rod; 802, impact rod; 803, groove; 804, blocking plate;

[0035] 9, feeding cylinder; 10, smoke pipe; 11, mixing rod; 12, ring plate. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0037] Please refer to Figures 1 to 7 A bubbling fluidized bed boiler burning biomass fuel, comprising a boiler body 1, a wind chamber 2 is fixedly installed on the boiler body 1, and an air pipe 3 is fixedly installed on the wind chamber 2, a top wall of the wind chamber 2 is fixedly installed with an air distribution plate 4, and air distribution holes are uniformly formed on the air distribution plate 4, and a discharge assembly 5 is arranged on the boiler body 1;

[0038] The discharge assembly 5 comprises a discharge chamber 501 formed on the boiler body 1, and a filter plate 502 is arranged in the discharge chamber 501, a motor 503 is fixedly arranged on the boiler body 1, a discharge groove 504 is formed on the boiler body 1 and communicates with the discharge chamber 501, a screw 505 is rotatably arranged in the discharge groove 504 and is fixedly connected with the output end of the motor 503, and the air distribution plate 4 is provided with a linkage assembly 6.

[0039] The linkage assembly 6 comprises a rotating rod 601 rotatably arranged on the air distribution plate 4, an impeller 602 fixedly arranged on the rotating rod 601 and matched with the air pipe 3, stirring rods 603 uniformly fixedly arranged on the rotating rod 601, linkage plates 604 fixedly arranged on the stirring rods 603 and matched with the filter plate 502, and a scraper 605 fixedly arranged on the rotating rod 601 and matched with the air distribution plate 4.

[0040] In use, the bed material on the top wall of the air distribution plate 4 is preheated, then the biomass fuel is put into the boiler, at the same time, the airflow enters the air chamber 2 through the air pipe 3 and enters the bed material through the air chamber 2, so as to drive the bed material to be fluidized, then the bubbles rise, coalesce and break in the bed material. The bed material and the fuel particles are mixed and rolled in this area, and the biomass particles entering the high-temperature bed layer are rapidly heated, dried and pyrolyzed to release a large amount of volatile combustible gas, the volatile is mixed with the secondary air in the space above the bed layer or the dilute phase zone and is combusted to form a flame, then the slag after combustion can enter the discharge chamber 501 through the filter plate 502, at this time, the slag can preliminarily heat the airflow in the air chamber 2, so as to utilize the preheating of the slag, and the air chamber 2 can avoid the slag from combining with the airflow again and affecting the fluidization effect of the bed material. When the slag in the discharge chamber 501 needs to be discharged, the user can start the motor 503, then the motor 503 drives the screw 505 to rotate, and the slag can be moved out of the boiler body 1 in the process of rotation of the screw 505, so as to realize automatic slag discharge, avoid the bed material from being misdischarged, and also avoid the slag from contacting the airflow again and affecting the fluidization effect, thereby improving the slag discharge effect.

[0041] In the process of air flow into the air chamber 2, the air flow will hit the impeller 602 and drive the impeller 602 to rotate, and then the impeller 602 can drive the rotating rod 601 to rotate in the process of rotating, and the stirring rod 603 can be driven to rotate in the process of rotating the rotating rod 601, and the bed material can be stirred in the process of rotating the stirring rod 603, thereby improving the fluidization effect, and the bubbles can be dispersed in the process of rotating the stirring rod 603, thereby further improving the combustion efficiency of the fuel, and the scraper 605 can be driven to rotate in the process of rotating the rotating rod 601, and then the large particle material on the top wall of the air distribution plate 4 can be cleaned in the process of rotating the scraper 605, thereby avoiding the large particle material from blocking the air distribution hole, affecting the bed material fluidization effect, and in the process of stirring the bed material by the stirring rod 603, the slag can be quickly moved to the filter plate 502, thereby ensuring that the slag quickly moves through the filter plate 502 to the discharge chamber 501, and in the process of rotating the stirring rod 603, the linkage plate 604 can be driven to rotate, and then the large particle bed material on the filter plate 502 can be cleaned in the process of rotating the linkage plate 604, thereby ensuring that the slag normally passes through the filter plate 502, and further improving the slag discharge effect.

[0042] As shown in Figure 2 , Figure 4 The air distribution plate 4 is provided with an annular groove 703, and the filter plate 502 and the annular groove 703 are jointly provided with a first spring 701, and the top wall of the filter plate 502 is fixedly provided with a push rod 702, and the top wall of the push rod 702 is inclined.

[0043] The side wall of the filter plate 502 is uniformly provided with an elastic rod 704, and the side wall of the discharge chute 504 is uniformly provided with a protrusion 705 matched with the elastic rod 704.

[0044] By adopting the above technical scheme, in the process of the rotating rod 601 driving the stirring rod 603 to rotate, 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, and then under the action of the pushing force, the push rod 702 moves downward, and in the process of the push rod 702 moving downward, the filter plate 502 moves downward and presses the first spring 701, and after the push rod 702 and the stirring rod 603 are disengaged, the first spring 701 drives the filter plate 502 to move upward, that is, in the process of rotating the stirring rod 603, the filter plate 502 can be driven to vibrate up and down, and in the process of the filter plate 502 vibrating, the bed material on the top wall of the filter plate 502 and the fuel that is not fully combusted can move to the top wall of the air distribution plate 4, in addition, in the process of the filter plate 502 vibrating, the slag can quickly pass through the side wall of the filter plate 502 into the discharge chamber 501, thereby further improving the slag discharge effect.

[0045] During the reciprocating movement of the filter plate 502, the filter plate 502 drives the elastic rod 704 to reciprocate up and down, and during the reciprocating movement of the filter plate 502, the convex block 705 will hit the elastic rod 704 and make the elastic rod 704 deform, and after the elastic rod 704 and the convex block 705 are out of contact, the elastic rod 704 shakes and resets under the action of its own elasticity, and during the shaking of the elastic rod 704, the vibration can be transmitted to the filter plate 502, and the filter plate 502 is shaken, and then during the shaking of the filter plate 502, the bed material and the slag around the filter plate 502 can be shaken, thereby increasing the flowability of the slag and the bed material, ensuring that the slag quickly passes through the filter plate 502 into the discharge chamber 501, and in addition, during the shaking of the filter plate 502, the filter plate 502 can be prevented from being blocked, affecting the passing effect of the slag, and further improving the slag discharge effect.

[0046] As shown in Figure 2 , Figure 3 , the top wall of the discharge chute 504 is uniformly and fixedly provided with a heat conduction rod 801, and the rotating rod 601 is uniformly and fixedly provided with a hitting rod 802.

[0047] The bottom wall of the air chamber 2 is provided with a groove 803 matched with the heat conduction rod 801, and the inner wall and the bottom wall of the air chamber 2 are both slidably provided with a blocking plate 804, and the blocking plate 804 is in sliding cooperation with the heat conduction rod 801.

[0048] By adopting the above technical scheme, after the slag enters the discharge chamber 501, the heat conduction rod 801 can transmit the heat of the high-temperature slag to the air chamber 2, thereby improving the utilization effect of the heat of the slag, and during the rotation of the rotating rod 601, the hitting rod 802 can also be driven to rotate, and then during the rotation of the hitting rod 802, the heat conduction rod 801 is hit, and since the heat conduction rod 801 is elastic and the end of the hitting rod 802 away from the rotating rod 601 is a slope, after being hit, the heat conduction rod 801 deforms and vibrates, and then the heat conduction rod 801 can transmit the vibration of the hitting to the bottom wall of the discharge chamber 501, so that the slag can be uniformly stacked in the discharge chamber 501, thereby avoiding the slag from being stacked directly below the filter plate 502, affecting the storage capacity of the slag in the discharge chamber 501, and at the same time, after the vibration is transmitted to the discharge chamber 501, the slag can flow into the discharge chute 504 normally, further improving the slag discharge effect.

[0049] After the hitting rod 802 contacts the heat conduction rod 801, the hitting rod 802 drives the heat conduction rod 801 to swing in the groove 803, and during the swinging of the hitting rod 802, the blocking plate 804 can block the groove 803, and by providing the groove 803, the swinging amplitude of the heat conduction rod 801 can be improved, thereby improving the vibration effect.

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

[0051] The mixing rods 11 are evenly fixedly mounted on the rotating rod 601 .

[0052] By adopting the above technical solution, during use, the user can put the fuel into the boiler body 1 through the feed barrel 9, and the smoke after combustion can be discharged to the outside through the smoke pipe 10, and 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, the push rods 702 are provided in two groups, and the two groups 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 mounted on the side wall of the filter plate 502 .

[0055] By adopting the above technical solution, in the process of the rotating rod 601 driving the filter plate 502 to move back and forth up and down through the stirring rod 603 and the push rod 702, by symmetrically arranging two groups of push rods 702 around the rotating rod 601, the filter plate 502 can be evenly stressed, thereby avoiding the filter plate 502 from getting stuck, and by arranging 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 burned slag can pass through the filter plate 502 and enter the discharge chamber 501. At this time, the slag can preliminarily heat the airflow in the wind chamber 2, so that the slag can be preheated and utilized. The setting of the wind chamber 2 can prevent the slag from combining with the airflow again. When the slag in the discharge chamber 501 needs to be discharged, the user can start the motor 503, and then the motor 503 drives the auger 505 to rotate. During the rotation of the auger 505, the slag can be driven to move outside the boiler body 1.

[0057] Then, in the process of air flow into the wind chamber 2, the air flow will hit the impeller 602 and drive the impeller 602 to rotate, and then the impeller 602 can drive the rotating rod 601 to rotate in the process of rotating, and the stirring rod 603 can be rotated in the process of rotating the rotating rod 601, and the bed material can be stirred in the process of rotating the stirring rod 603, and the bubbles can be dispersed in the process of rotating the stirring rod 603, and the scraper 605 can be rotated in the process of rotating the rotating rod 601, and then the large particle material on the top wall of the distribution plate 4 can be cleaned in the process of rotating the scraper 605, so as to avoid the large particle material from blocking the distribution hole, affecting the fluidization effect of the bed material, and in the process of stirring the bed material by the stirring rod 603, the slag can be quickly moved to the filter plate 502, so as to ensure that the slag quickly moves through the filter plate 502 to the discharge chamber 501, and in the process of rotating the stirring rod 603, the linkage plate 604 can be rotated, and then the large particle bed material on the filter plate 502 can be cleaned in the process of rotating the linkage plate 604, so as to ensure that the slag normally passes through the filter plate 502.

[0058] In addition, in the process of rotating the stirring rod 603 driven by the rotating rod 601, the filter plate 502 is driven downward by the stirring rod 603 in the process of rotating the stirring rod 603, and the first spring 701 is extruded, and after the push rod 702 is separated from the stirring rod 603, the first spring 701 drives the filter plate 502 to move upward, that is, the filter plate 502 can be shaken up and down in the process of rotating the stirring rod 603, and the bed material on the top wall of the filter plate 502 and the fuel not fully combusted can be moved to the top wall of the distribution plate 4 in the process of shaking the filter plate 502, and the slag can quickly pass through the side wall of the filter plate 502 into the discharge chamber 501 in the process of shaking the filter plate 502; and in the process of reciprocating the filter plate 502, the filter plate 502 drives the elastic rod 704 to reciprocate up and down, and in the process of reciprocating the filter plate 502, the protrusion 705 will hit the elastic rod 704 and make the elastic rod 704 deform, and after the elastic rod 704 is separated from the protrusion 705, the elastic rod 704 is shaken and reset under the action of its own elasticity, and in the process of shaking the elastic rod 704, the vibration can be transmitted to the filter plate 502 and make the filter plate 502 shake, and then the bed material and the slag around the filter plate 502 can be shaken in the process of shaking the filter plate 502, thereby increasing the flowability of the slag and the bed material, and ensuring that the slag quickly passes through the filter plate 502 into the discharge chamber 501.

[0059] Finally, after the slag enters into the discharging chamber 501, the heat conduction rod 801 can transfer the heat of the high-temperature slag into the air chamber 2, thereby improving the utilization effect of the slag heat, and the impact rod 802 can be driven to rotate in the process of the rotation of the rotating rod 601, and then the impact rod 802 can impact the heat conduction rod 801 in the process of the rotation of the impact rod 802. Since the heat conduction rod 801 is elastic, after the impact, the heat conduction rod 801 is deformed and vibrates, and then the heat conduction rod 801 can transfer the vibration of the impact to the bottom wall of the discharging chamber 501, so that the slag can be uniformly stacked in the discharging chamber 501, thereby avoiding the slag from being stacked directly below the filter plate 502, affecting the storage capacity of the slag in the discharging chamber 501, and at the same time, after the vibration is transferred to the discharging chamber 501, the slag can be ensured to flow into the discharging chute 504 normally.

[0060] The above merely provides the preferred but not limiting embodiments of the present application. Any person skilled in the art, according to the technical range disclosed by the present application, can make equivalent replacements or changes to the technical solutions and the improved concepts of the present application, which should be covered by the protection range of the present application.

Claims

1. A bubbling fluidized bed boiler for burning biomass fuel, comprising a boiler body (1), characterized in that: The boiler body (1) is fixedly mounted with an air chamber (2), and an air duct (3) is fixedly mounted on the air chamber (2); an air distribution plate (4) is fixedly mounted on the top wall of the air chamber (2), and air distribution holes are evenly arranged on the air distribution plate (4); and a discharge assembly (5) is provided on the boiler body (1); The discharge assembly (5) comprises a discharge chamber (501) provided on the boiler body (1), a filter plate (502) being provided in the discharge chamber (501), a motor (503) being fixedly mounted on the boiler body (1), a discharge trough (504) being provided on the boiler body (1) and communicating with the discharge chamber (501), an auger (505) being rotatably mounted in the discharge trough (504) and being fixedly connected to the output end of the motor (503), and a linkage assembly (6) being provided on the air distribution plate (4).

2. The bubbling fluidized bed boiler for burning biomass fuel according to claim 1, characterized in that: The linkage assembly (6) comprises a rotating rod (601) rotatably mounted on the air distribution plate (4); an impeller (602) cooperating with the air duct (3) is fixedly mounted on the rotating rod (601); a stirring rod (603) is evenly fixedly mounted on the rotating rod (601); a linkage plate (604) affixed to the filter plate (502) is fixedly mounted on the stirring rod (603); and a scraper (605) affixed to the air distribution plate (4) is fixedly mounted on the rotating rod (601).

3. The bubbling fluidized bed boiler for burning biomass fuel according to claim 2, characterized in that: An annular groove (703) is provided on the air distribution plate (4), 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 an inclined surface.

4. The bubbling fluidized bed boiler for burning biomass fuel according to claim 3, characterized in that: Elastic rods (704) are evenly fixedly mounted on the side walls of the filter plate (502), and protrusions (705) that cooperate with the elastic rods (704) are evenly fixedly mounted on the side walls of the discharge trough (504).

5. The bubbling fluidized bed boiler for burning biomass fuel according to claim 2, characterized in that: Heat-conducting rods (801) are evenly fixedly mounted on the top wall of the discharge trough (504), and impact rods (802) are evenly fixedly mounted on the rotating rod (601).

6. The bubbling fluidized bed boiler for burning biomass fuel according to claim 5, characterized in that: A groove body (803) cooperating with the heat-conducting rod (801) is provided on the bottom wall of the air chamber (2), and a blocking plate (804) is slidably mounted on the inner wall and the bottom wall of the air chamber (2), and the blocking plate (804) is slidably cooperating with the heat-conducting rod (801).

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

8. The bubbling fluidized bed boiler for burning biomass fuel according to claim 2, characterized in that: The mixing rods (11) are evenly fixedly mounted on the rotating rod (601).

9. The bubbling fluidized bed boiler for burning biomass fuel according to claim 3, characterized in that: The push rods (702) are provided in two groups, and the two groups of push rods (702) are symmetrically arranged around the rotating rod (601).

10. The bubbling fluidized bed boiler for burning biomass fuel according to claim 3, characterized in that: An annular plate (12) for sealing the annular groove (703) is fixedly mounted on the side wall of the filter plate (502).

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