Biomass pellet combustion device and combustion method

Abstract

An embodiment of the present application provides a biomass pellet combustion device and method. In the device, the furnace body has a combustion chamber, a feeding port, and an ash outlet; the rotating shaft is rotatably connected to the furnace body; a first gas passage is provided on the rotating shaft; the gas delivery pipe is configured to communicate with the first gas passage; the driving device is arranged on the furnace body and is configured to drive the rotating shaft; the baffle is arranged in the combustion chamber, below the feeding port and above the ash outlet, and is fixed to the rotating shaft; a second gas passage communicating with the first gas passage is provided on the baffle; the baffle has a jet surface for carrying biomass pellets, and a plurality of gas outlets communicating with the second gas passage are provided on the jet surface; the baffle is configured to have a first position and a second position; when the baffle is in the first position, the included angle between the jet surface and the horizontal direction is a first included angle; when the baffle is in the second position, the included angle between the jet surface and the horizontal direction is a second included angle; the first included angle is smaller than the second included angle.

Description

Technical Field

[0001] This application belongs to the technical field of waste treatment, and particularly relates to a biomass pellet combustion device and a combustion method. Background Art

[0002] In recent years, the development and recycling of biomass fuels have received unprecedented attention. Biomass fuels mainly come from shredded firewood, firewood, straw, corncobs, various fruit shells, etc.; through a series of deep processing, biomass fuels are usually produced into biomass pellets, and then burned to be converted into biomass energy to provide alternative energy for industry, which not only solves the problem of the treatment of agricultural and forestry waste, but also reduces the emissions of CO2 and harmful gases into the atmosphere.

[0003] For example, Chinese Patent No. CN103591573B discloses a biomass combustion furnace, including a combustion base, a combustion chamber provided on the combustion base, and a flange provided on the combustion chamber. It is characterized in that: the combustion base includes a combustion base body, a feeding device and a second blower. One end of the combustion base body is provided with an ash storage box, and the other end is provided with an air inlet box. A combustion trough communicating with the ash storage box and the air inlet box is provided on the upper part of the combustion base body. The combustion trough is provided with ventilation holes. The combustion trough, the bottom surface, the side surface, the ash storage box and the air box of the combustion base body together form a cavity. An air inlet communicating with the air box is opened on the side surface of the cavity connected to the air box. The feeding device is arranged outside the combustion base body and leads to the combustion trough through the air box. The second blower is communicated with the air box. The combustion trough is composed of a bottom plate and two side plates. The two side plates expand upward and outward along the direction away from the bottom plate, and the included angle between them is 100°-130°. In the technical solution provided by this patent, due to its special structural design, the ash generated after the biomass is burned on the combustion trough is blown into the ash storage box in the opposite direction by the air from the air inlet chamber along the combustion trough and collected by the ash storage box.

[0004] Since the air inlet box is arranged on one side in the above patent, the air distribution inside the furnace body is not uniform enough, which leads to insufficient combustion of the biomass combustion furnace and reduces the combustion efficiency. Summary of the Invention

[0005] This application proposes a biomass pellet combustion device and a combustion method, aiming to improve the gas distribution in the combustion device and facilitate ash discharge.

[0006] An embodiment of this application proposes a biomass pellet combustion device, including:

[0007] A furnace body having a combustion chamber, a feeding port communicating with the fuel chamber, and an ash outlet communicating with the combustion chamber;

[0008] A rotating shaft rotatably connected to the furnace body; a first gas passage is provided on the rotating shaft;

[0009] An air delivery pipe configured to communicate with the first gas passage;

[0010] A driving device provided on the furnace body and configured to drive the rotating shaft;

[0011] A baffle provided in the combustion chamber, below the feeding port and above the ash outlet, and fixed to the rotating shaft; a second gas passage communicating with the first gas passage is provided on the baffle; the baffle has a jet surface provided with a plurality of gas outlets communicating with the second gas passage, and the plurality of gas outlets are spaced apart in a direction extending from the connecting section of the baffle and the rotating shaft towards the interior of the furnace body;

[0012] The baffle is configured to have a first position and a second position; when the baffle is in the first position, the included angle between the jet surface and the horizontal direction is a first included angle and is oriented towards the heat receiving body; when the baffle is in the second position, the included angle between the jet surface and the horizontal direction is a second included angle; the first included angle is less than the second included angle.

[0013] Optionally, the second included angle is at least greater than 60°, and the first included angle is less than or equal to 45°.

[0014] Optionally, there are two rotating shafts and two baffles, and the rotating shafts are connected to the baffles in a one-to-one correspondence;

[0015] Among them, the two rotating shafts are respectively provided on opposite wall bodies of the furnace body; the two baffles are symmetrically arranged.

[0016] Optionally, the baffle extends from the rotating shaft towards the combustion chamber; the second gas passage has a first unit passage extending in the extending direction of the baffle, and the first unit passage communicates with the first gas passage; the plurality of gas outlets are spaced apart on the jet surface and communicate with the first unit passage.

[0017] Optionally, the cross-sectional area of the first unit passage gradually decreases in a direction away from the rotating shaft.

[0018] Optionally, the gas ejection directions of the plurality of gas outlets and the jet surface all have a third included angle, and the third included angles of the plurality of gas outlets gradually decrease in a direction away from the rotating shaft, and the third included angle of the gas outlet closest to the rotating shaft is not greater than 90°.

[0019] Optionally, the second gas channel further has a second gas unit channel that communicates with and intersects the first unit channel.

[0020] The plurality of gas outlets are spaced apart on the jet surface, and a part of them communicate with the second gas unit channel.

[0021] Optionally, there are multiple parallel first unit channels.

[0022] The present application also provides a method for burning biomass particles, using the combustion device as described above. The method includes: during combustion, biomass particles are input through the feeding port and combustion-supporting gas is input through the gas delivery pipe, and the driving device is controlled to drive the rotating shaft to rotate so that the baffle is adjusted to the first position and maintained at the first position within the first time period; the driving device is controlled to drive the rotating shaft to rotate to adjust the baffle to the second position and maintain the baffle at the second position within the second time period.

[0023] Optionally, within the first time period, combustion-supporting gas is input through the gas delivery pipe at a first pressure; within the second time period, combustion-supporting gas is input through the gas delivery pipe at a second pressure; wherein, the first pressure is greater than the second pressure.

[0024] In the technical solution of the embodiment of the present application, a baffle is provided in the combustion furnace body, and the baffle is connected to a rotating shaft; a second gas channel and gas outlets communicating with the second gas channel are provided in the baffle; a first gas channel communicating with the second gas channel is provided in the rotating shaft; the first gas channel is communicated with the gas delivery pipe; since the gas outlets are provided on the jet surface, and the jet surface faces the heating body when the baffle is in the first position; during combustion, the combustion-supporting gas is ejected from a plurality of gas outlets on the jet surface, and the plurality of gas outlets are spaced apart in the direction extending from the connection section of the baffle and the rotating shaft towards the inside of the furnace body, so that the combustion-supporting gas can be ejected at different positions of the cross-section of the furnace body, making the distribution of the combustion-supporting gas uniform, so that the biomass particles can burn sufficiently; while in the ash discharging state, the baffle is rotated to the second position, at this time, compared with the first position, the baffle is closer to the vertical state, and the cross-section occupied by the baffle is smaller at this time, so that when the gas is ejected, the gas blows the ash to the middle position of the furnace body, making the ash more concentrated in the middle position of the furnace body, facilitating ash discharging. Description of the Drawings

[0025] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1 It is a schematic structural diagram of the biomass pellet combustion device in the combustion state according to the embodiment of the present application;

[0027] Figure 2 It is a schematic structural diagram of the biomass pellet combustion device in the combustion (accompanied by ash discharge) or only ash discharge state according to the embodiment of the present application;

[0028] Figure 3 It is a first schematic structural diagram of the baffle and the rotating shaft in the combustion device according to the embodiment of the present application;

[0029] Figure 4 It is a second schematic structural diagram of the baffle and the rotating shaft in the combustion device according to the embodiment of the present application;

[0030] Figure 5 It is a third schematic structural diagram of the baffle and the rotating shaft in the combustion device according to the embodiment of the present application;

[0031] Figure 6 It is a fourth schematic structural diagram of the baffle and the rotating shaft in the combustion device according to the embodiment of the present application.

[0032] List of reference numerals:

[0033] 10. Furnace body; 11. Combustion chamber; 12. Feeding port; 13. Ash outlet; 20. Baffle; 21. Rotating shaft; 201. Second gas passage; 2011. First unit passage; 2012. Second unit passage; 202. Gas outlet; Jet surface 203; 211. First gas passage; α1. First included angle; α2. Second included angle; α3. Third included angle. Detailed implementation manners

[0034] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive. Moreover, 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 invention, rather than all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0037] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0038] In this application, the term "exemplary" is used to mean "serving as an example, instance, or illustration". Any embodiment described as "exemplary" in this application is not necessarily to be construed as more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. In the following description, details are set forth for the purpose of explanation. It should be understood that the invention can be practiced without these specific details. In other instances, well-known structures and processes are not elaborated in detail to avoid obscuring the description of the invention with unnecessary details. Therefore, the invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed in this application.

[0039] Biomass pellet combustion is one of the ways of biomass recycling. Biomass pellets burn in the furnace body. In the prior art, oxygen is usually supplied at the bottom of the furnace body to provide a combustion-supporting agent for the combustion of biomass pellets. This gas supply method has the technical deficiency that the gas is unevenly distributed in the furnace body, which in turn affects the combustion efficiency. Therefore, the embodiments of this application provide a biomass pellet combustion device, aiming to improve the technical problem of uneven gas distribution in the furnace body and also facilitate ash discharge.

[0040] Refer to Figure 1 As shown, the embodiments of this application propose a biomass pellet combustion device, including:

[0041] A furnace body 10, having a combustion chamber 11, a feeding port 12 communicating with the fuel chamber, and an ash outlet 13 communicating with the combustion chamber 11;

[0042] A rotating shaft 21, the rotating shaft 21 is rotatably connected to the furnace body 10; a first gas passage 211 is provided on the rotating shaft 21;

[0043] A gas transmission pipe (not shown), the gas transmission pipe is configured to communicate with the first gas passage 211;

[0044] A driving device (not shown), the driving device is provided on the furnace body 10 and is configured to drive the rotating shaft 21;

[0045] a baffle 20, the baffle 20 being arranged in the combustion chamber 11, being located at the lower side of the charging port 12 and the upper side of the ash outlet 13, and being fixed on the rotating shaft 21; the baffle 20 being provided with a second gas channel 201 communicating with the first gas channel 211; the baffle 20 having an air jet surface 203, the air jet surface 203 being provided with a plurality of gas outlets 202 communicating with the second gas channel 201, the plurality of gas outlets 202 being arranged at intervals in a direction extending from a connection section of the baffle 20 and the rotating shaft 21 toward the inside of the furnace body 10;

[0046] The baffle 20 is configured to have a first position and a second position; when the baffle 20 is in the first position, the angle between the jet surface 203 and the horizontal direction is a first angle α1 and is set toward the heat body; when the baffle 20 is in the second position, the angle between the jet surface 203 and the horizontal direction is a second angle α2; the first angle α1 is smaller than the second angle α2.

[0047] In the technical solution of the embodiment of the present application, a baffle 20 is arranged in the combustion furnace body 10, and the baffle 20 is connected to a rotating shaft 21; a second gas channel 201 and a gas outlet 202 connected to the second gas channel 201 are arranged in the baffle 20; a first gas channel 211 connected to the second gas channel 201 is arranged in the rotating shaft 21; and the first gas channel 211 is connected through a gas pipe; since the gas outlet 202 is arranged on the jet surface 203, the jet surface 203 is arranged toward the heat receiving body when the baffle 20 is in the first position; during combustion, the combustion-supporting gas is ejected from the plurality of gas outlets 202 on the jet surface 203 The plurality of gas outlets 202 are arranged at intervals in a direction extending from the connection section between the baffle 20 and the rotating shaft 21 toward the inside of the furnace body 10, so that the combustion-supporting gas can be ejected at different positions of the cross section of the furnace body 10, so that the combustion-supporting gas is evenly distributed, so that the biomass particles can be fully burned; and in the ash discharge state, the baffle 20 is rotated to the second position. At this time, relative to the first position, the baffle 20 is closer to a vertical state, and the cross section occupied by the baffle 20 is smaller, so that when the gas is ejected, the gas blows the ash to the middle position of the furnace body 10, so that the ash is more concentrated in the middle position of the furnace body 10, so as to facilitate ash discharge.

[0048] It should be noted that the driving device is usually provided with a stepping motor. The combustion treatment device is provided with a control system, and the control system is configured to control the rotation of the stepping motor to drive the baffle 20 to switch states between a first position and a second position. Control the driving device to drive the rotating shaft 21 to rotate so that the baffle 20 is adjusted to the first position and maintain the baffle 20 in the first position within a first time period; control the driving device to drive the rotating shaft 21 to rotate to adjust the baffle 20 to the second position and maintain the baffle 20 in the second position within a second time period.

[0049] That is, in the embodiment, the first time period is the combustion period, and the second time period is the ash discharge period. Usually, the combustion period is generally longer, and the ash discharge period is generally shorter. In the embodiment, since during combustion, a part of the ash will be deposited on the jet surface 203; while during ash discharge, by adjusting the baffle 20 to the second position, the ash can be more easily blown away by the gas. And during combustion, in order to improve the combustion efficiency, the baffle 20 will be adjusted to the first position, and the cross-section occupied by the baffle 20 is larger, facilitating the gas to disperse.

[0050] In the embodiment, the ash outlet 13 is usually arranged at the bottom of the furnace body 10, and the feeding inlet is usually arranged on the side of the furnace body 10. The feeding device for biomass particles usually uses a screw conveyor for feeding.

[0051] In some alternative embodiments, the second included angle α2 is at least greater than 60°, and the first included angle α1 is less than or equal to 45°. In the embodiment, the second included angle α2 being at least greater than 60° is to facilitate the baffle 20 to be closer to the vertical state during ash discharge; the first included angle α1 being less than or equal to 40° is to facilitate the baffle 20 to occupy more of the combustion area in the combustion chamber 11 so that the blown gas can be dispersed within the combustion area. In some embodiments, during combustion, the first included angle α1 can be 0°, that is, the baffle 20 is horizontal. And during ash discharge, the second included angle α2 is 90°, that is, the baffle 20 is vertical.

[0052] In some embodiments, since the heated wall of the heat-receiving body is arc-shaped, its bottom serves as the main rapid-heating area. Thus, in some embodiments, there are two rotating shafts 21 and two baffles 20, and the rotating shafts 21 are respectively and correspondingly connected to the baffles 20; wherein, the two rotating shafts 21 are respectively arranged on two opposite wall bodies of the furnace body 10; the two baffles 20 are symmetrically arranged. It can be understood that the baffles 20 can be symmetrically arranged. For example, when the first included angle α1 is adjusted to 0°, the two baffles 20 can be in contact with each other. In some embodiments, during combustion, when the two baffles 20 are in the first position, the normal lines of their respective gas jet surfaces 203 intersect at the center of curvature of the heated wall. At this time, the direction of the ejected gas points to the center of curvature of the heated wall, so that the generated heat can be more conducted to the heated wall under the action of the air flow, and more absorbed by the heated wall, improving the utilization rate of biomass particle energy.

[0053] As shown in Figure 1 , when the two baffles 20 are both in the first position, at this time, the space between the two baffles 20 occupies a larger space in the horizontal direction of the combustion chamber 11, facilitating the diffusion of the combustion-supporting gas in the horizontal direction after it is ejected, and facilitating the supply of the combustion-supporting agent for the combustion of biomass particles; moreover, the combustion-supporting gas ejection ports mostly have an upward component, so as to lift the heat upward and improve the heat transfer efficiency.

[0054] As shown in Figure 2 , when the two baffles 20 are in the second position, at this time, the space between the two baffles 20 occupies a smaller space in the horizontal direction of the combustion chamber 11 and is close to the vertical state. At this time, the combustion-supporting gas ejected by the two baffles 20 mostly has a horizontal component, so that the ash is blown between the two, and then under the action of gravity, the ash falls, facilitating ash discharge.

[0055] In some alternative embodiments, the baffle 20 is formed by extending from the rotating shaft 21 towards the combustion chamber 11. The second gas passage 201 has a first unit passage 2011 extending in the extending direction of the baffle 20. As shown in Figure 3 , the first unit passage 2011 is communicated with the first gas passage 211; the plurality of gas outlets 202 are arranged at intervals on the gas jet surface 203 and are communicated with the first unit passage 2011. The first unit passage 2011 is used to guide the combustion-supporting gas to each of the gas outlets 202 arranged at intervals, so that the combustion-supporting gas can be ejected at different cross-sectional positions of the combustion chamber 11, and the combustion-supporting gas can be evenly distributed in the cross-section.

[0056] Generally, the heat-receiving body is installed at the middle position of the combustion device, as shown in Figure 4As shown, in some alternative embodiments, the cross-sectional area of the first unit channel 2011 gradually decreases in the direction away from the rotation axis 21. That is to say, the first unit channel 2011 has the function of increasing the gas pressure, so that the gas is ejected at a certain pressure near the middle position of the chamber, facilitating the guiding of heat energy to the heated body.

[0057] In some alternative embodiments, as Figure 6 shown, the gas ejection directions of several of the gas outlets 202 and the jet surface 203 all have a third included angle α3, and the third included angle α3 of several of the gas outlets 202 gradually decreases in the direction away from the rotation axis 21, and the third included angle α3 of the gas outlet 202 closest to the rotation axis 21 is not greater than 90°. In this embodiment, since the gas ejection directions of the gas outlets 202 are different and are arranged such that the third included angle α3 gradually decreases in the direction away from the rotation axis 21, when the baffle 20 is in the first position, the gas ejection direction is more directed towards the middle position of the combustion chamber 11. The different gas ejection directions facilitate the interaction of multiple airflows when they meet, enabling the airflows to fully diffuse within the combustion chamber 11.

[0058] When the baffle 20 is in the second position, the gas ejection direction is more downward, facilitating the blowing of the ash towards the ash outlet 13 and improving the ash discharge efficiency.

[0059] Moreover, in the embodiment, the third included angle α3 of the gas outlet 202 closest to the rotation axis 21 is not greater than 90°. This is mainly to avoid the gas ejection direction being towards the side wall of the combustion device when in the first position, and to avoid the gas ejection direction having a relatively large upward component or having an upward component (this is mainly related to the setting of the second included angle α2) when in the second position.

[0060] In some alternative embodiments, as Figure 5 shown, the second gas channel 201 further has a second unit channel 2012 that communicates with and intersects the first unit channel 2011. The several gas outlets 202 are spaced apart on the jet surface 203, and a part of them communicates with the second unit channel 2012. By setting it this way, it mainly improves the arrangement density of the gas outlets 202 to increase the intake air volume per unit time.

[0061] In some alternative embodiments, there are multiple parallel first unit channels 2011. By setting it this way, it mainly improves the arrangement density of the gas outlets 202 to increase the intake air volume per unit time.

[0062] The present application also provides a method for burning biomass particles, which uses the combustion device as described above. The method includes: during combustion, biomass particles are fed through the feeding port 12 and combustion-supporting gas is input through the gas delivery pipe, and the driving device is controlled to drive the rotating shaft 21 to rotate, so that the baffle 20 is adjusted to the first position and the baffle 20 is maintained at the first position within the first time period; the driving device is controlled to drive the rotating shaft 21 to rotate to adjust the baffle 20 to the second position and the baffle 20 is maintained at the second position within the second time period.

[0063] In the technical solution of the embodiment of the present application, a baffle 20 is arranged in the combustion furnace body 10, and the baffle 20 is connected to a rotating shaft 21; a second gas passage 201 and a gas outlet 202 communicating with the second gas passage 201 are arranged in the baffle 20; a first gas passage 211 communicating with the second gas passage 201 is arranged in the rotating shaft 21; and it is communicated with the first gas passage 211 through a gas delivery pipe. Since the gas outlet 202 is arranged on the jet surface 203, and the jet surface 203 faces the heating body when the baffle 20 is in the first position. By controlling the baffle 20 to be in the first position within the first time period, during combustion, the combustion-supporting gas is ejected from a plurality of gas outlets 202 on the jet surface 203, and the plurality of gas outlets 202 are arranged at intervals in the direction extending from the connection section of the baffle 20 and the rotating shaft 21 towards the inside of the furnace body 10, so that the combustion-supporting gas can be ejected at different positions of the cross-section of the furnace body 10, making the distribution of the combustion-supporting gas uniform, so that the biomass particles can burn sufficiently. By controlling the baffle 20 to be in the second position within the second time period, in the ash discharge state, the baffle 20 is rotated to the second position. At this time, compared with the first position, the baffle 20 is closer to the vertical state, and the cross-section occupied by the baffle 20 is smaller at this time, so that when the gas is ejected, the gas blows the ash to the middle position of the furnace body 10, making the ash more concentrated in the middle position of the furnace body 10, which is convenient for ash discharge.

[0064] In some embodiments, during the ash discharge state, biomass particles can also be fed through the feeding port 12. At this time, in the second position state, the direction of the ejected gas has a component in the direction of orientation and has a lifting force to meet the combustion of biomass particles, so as to ensure that the biomass particles in the furnace body 10 are in a combustion state during ash discharge, so as to ensure the furnace temperature and facilitate quickly entering the combustion state when the baffle 20 is adjusted to the first position.

[0065] During the first time period, combustion-supporting gas is input through the gas delivery pipe at a first pressure; during the second time period, combustion-supporting gas is input through the gas delivery pipe at a second pressure; wherein, the first pressure is greater than the second pressure. In this embodiment, during the second time period, it is mainly used to blow away the ash on the baffle 20. In order to save combustion-supporting gas, the injection pressure of the combustion-supporting gas is reduced. When the baffle 20 is in the second position, the ash is more affected by gravity in the direction of gravity and can slide off the baffle 20 based on gravity, so the pressure of the injected combustion-supporting gas can be reduced.

[0066] The above has introduced in detail a biomass pellet combustion device and a combustion method provided by an embodiment of the present application. Specific examples are used herein to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. Biomass pellet combustion device, characterized in that, Comprising: A furnace body, having a combustion chamber, a feeding port communicating with the combustion chamber, and an ash outlet communicating with the combustion chamber; A rotating shaft, which is rotatably connected to the furnace body; a first gas passage is provided on the rotating shaft; A gas delivery pipe, which is configured to communicate with the first gas passage; A driving device, which is arranged on the furnace body and configured to drive the rotating shaft; A baffle plate, which is arranged in the combustion chamber, below the feeding port and above the ash outlet, and is fixed to the rotating shaft; a second gas passage communicating with the first gas passage is provided on the baffle plate; the baffle plate has a jet surface, and a plurality of gas outlets communicating with the second gas passage are provided on the jet surface, and the plurality of gas outlets are spaced apart in a direction extending from the connection section of the baffle plate and the rotating shaft towards the interior of the furnace body; The baffle plate is configured to have a first position and a second position; when the baffle plate is in the first position, the included angle between the jet surface and the horizontal direction is a first included angle and is set towards the heating body; when the baffle plate is in the second position, the included angle between the jet surface and the horizontal direction is a second included angle; the first included angle is less than the second included angle.

2. The biomass pellet combustion device according to claim 1, wherein The second included angle is at least greater than 60°, and the first included angle is less than or equal to 45°.

3. The biomass pellet combustion device according to claim 1, characterized in that, There are two rotating shafts and two baffle plates, and the rotating shafts are connected to the baffle plates in a one-to-one correspondence; Wherein, the two rotating shafts are respectively arranged on opposite wall bodies of the furnace body; the two baffle plates are symmetrically arranged.

4. The biomass pellet combustion device according to claim 1, characterized in that, The baffle plate extends from the rotating shaft towards the combustion chamber; the second gas passage has a first unit passage extending in the extending direction of the baffle plate, and the first unit passage communicates with the first gas passage; the plurality of gas outlets are spaced apart on the jet surface and communicate with the first unit passage.

5. The biomass pellet combustion device according to claim 4, characterized in that, The cross-sectional area of the first unit passage gradually decreases in a direction away from the rotating shaft.

6. The biomass pellet combustion device according to claim 4 or 5, characterized in that, The gas ejection directions of the plurality of gas outlets and the jet surface all have a third included angle, and the third included angles of the plurality of gas outlets gradually decrease in a direction away from the rotating shaft, and the third included angle of the gas outlet closest to the rotating shaft is not greater than 90°.

7. The biomass pellet combustion device according to claim 4, characterized in that, The second gas passage further has a second gas unit passage communicating with and intersecting the first unit passage, The plurality of gas outlets are spaced apart on the jet surface, and a part of them communicates with the second gas unit passage.

8. The biomass pellet combustion device according to claim 4, wherein, There are multiple parallel first unit passages.

9. A method for burning biomass particles, characterized in that, Using the combustion device according to any one of claims 1 to 8; the method includes: During combustion, biomass particles are input through the feeding port and combustion-supporting gas is input through the gas delivery pipe, and the driving device is controlled to drive the rotating shaft to rotate, so that the baffle plate is adjusted to the first position and the baffle plate is maintained in the first position within a first time period; Controlling the driving device to drive the rotating shaft to rotate to adjust the baffle plate to the second position and maintaining the baffle plate in the second position within a second time period.

10. The biomass pellet combustion method according to claim 9, characterized in that, During the first time period, combustion-supporting gas is input through the gas pipeline at a first pressure; during the second time period, combustion-supporting gas is input through the gas pipeline at a second pressure; wherein, the first pressure is greater than the second pressure.

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