A biomass combustion furnace

Abstract

This invention provides a biomass combustion furnace, comprising a furnace body, a staged combustion mechanism, an ignition mechanism, and a partitioning mechanism built into the combustion body, and a blower combustion-aiding mechanism located outside the furnace body. The staged combustion mechanism is located below the feed inlet, and a ventilation chamber is formed between the staged combustion mechanism and the bottom plate of the furnace body. The staged combustion mechanism includes a first combustion section and a second combustion section. The partitioning mechanism divides the ventilation chamber into a first ventilation chamber and a second ventilation chamber, and the partitioning mechanism has ventilation holes connecting the first and second ventilation chambers. The first combustion section has a first blowing hole connecting to the first ventilation chamber, and the second combustion section has a second blowing hole connecting to the second ventilation chamber with a diameter smaller than the first blowing hole. This application achieves zoned combustion, which can reduce biomass pellet coking, making the staged combustion mechanism cleaner, and also reduces blown-up ash, preventing blockage of the heat exchange tubes located at the top of the furnace body.

Description

Technical Field

[0001] This invention relates to the field of combustion equipment technology, and in particular to a biomass combustion furnace. Background Technology

[0002] Biomass fuel refers to fuel made by burning biomass materials, primarily agricultural and forestry waste such as straw, sawdust, bagasse, and rice husks, which is distinct from fossil fuels. The main application of biomass fuel is in biomass pellet fuel, which uses agricultural and forestry waste as raw material and processes it through crushing, mixing, extrusion, and drying to produce various shaped pellets that can be directly burned—a clean fuel.

[0003] Biomass fuel is formed into pellet-like biofuels. With the widespread use of biomass fuels, combustion furnaces for burning biomass fuels have emerged. Existing biomass combustion furnaces generally place the biomass fuel on the grate of the furnace for centralized combustion. This combustion method results in incomplete combustion of fuel, and the biomass fuel is prone to coking on the grate, affecting the combustion effect.

[0004] Therefore, it is necessary to propose a biomass combustion furnace to solve or at least alleviate the above-mentioned defects. Summary of the Invention

[0005] The main objective of this invention is to provide a biomass combustion furnace to solve the problem that existing biomass combustion furnaces generally concentrate biomass fuel on the grate of the furnace for overall combustion. This combustion method has the problems of incomplete fuel combustion, which makes the biomass fuel easy to coke on the grate and affect the combustion effect.

[0006] To achieve the above objectives, the present invention provides a biomass combustion furnace, comprising a combustion furnace body, a staged combustion mechanism, an ignition mechanism, and a separation mechanism built into the combustion furnace body, and a blower combustion-aiding mechanism located outside the combustion furnace body; wherein, The combustion furnace body has a feed hole, a slag discharge hole, and a connecting hole that matches the blower combustion mechanism; The ignition mechanism is used to ignite the biomass fuel from the feed port; The staged combustion mechanism is located below the feed hole. The staged combustion mechanism is fixedly connected to the inner wall of the combustion furnace body. A ventilation chamber is formed between the staged combustion mechanism and the bottom plate of the combustion furnace body. The staged combustion mechanism includes a first combustion section and a second combustion section connected to each other for biomass fuel to be bed-burned. The first combustion section is located close to the feed hole, and the second combustion section is located away from the feed hole. The partitioning mechanism is disposed in the ventilation chamber, and the partitioning mechanism divides the ventilation chamber into a first ventilation chamber corresponding to the first combustion section and a second ventilation chamber corresponding to the second combustion section; the partitioning mechanism has a ventilation hole connecting the first ventilation chamber and the second ventilation chamber; the blower combustion mechanism is connected to the first ventilation chamber through the connecting hole; the first combustion section has a first blowing hole connecting to the first ventilation chamber, and the second combustion section has a second blowing hole connecting to the second ventilation chamber with a diameter smaller than the first blowing hole; The first blowing hole is used to blow air from the first ventilation chamber toward the biomass fuel located on the first combustion section, and to move the biomass fuel toward the second combustion section; The second blowing hole is used to blow air from the first ventilation chamber into the second ventilation chamber through the ventilation hole toward the second combustion section.

[0007] Preferably, it further includes a material conveying mechanism, which includes a drive motor, a first feeding mechanism and a second feeding mechanism that are drively connected to the drive motor, wherein... The output shaft of the drive motor is provided with a first sprocket; The first feeding mechanism includes a cylindrical first housing and a first helical blade shaft rotatably disposed within the first housing; the first helical blade shaft includes a first driving end and a first discharging end disposed opposite to each other, the first driving end of the first helical blade shaft extends out of the first housing, and a second sprocket is fixed on the first driving end; the top of the first housing has a first feeding opening on the side near the first driving end, and the bottom of the first housing has a first discharging opening on the side near the first discharging end; The second feeding mechanism is located below the first feeding mechanism and includes a cylindrical second outer shell and a second helical blade shaft rotatably disposed within the second outer shell. The second helical blade shaft includes a second driving end and a second discharge end disposed opposite to each other. The second driving end of the second helical blade shaft extends out of the second outer shell, and a third sprocket is fixed on the second driving end. A second feeding opening is formed on the top of the second outer shell on the side near the second driving end. A second discharge opening communicating with the feeding hole is opened on the second outer shell near the second discharge end. The second feeding opening and the first discharge opening are connected by a feeding channel.

[0008] Preferably, the partitioning mechanism includes horizontal and vertical partitions connected to each other. The horizontal partition is arranged horizontally directly below the first combustion section. One end of the horizontal partition is connected to the inner wall of the combustion furnace body, and the other end is connected to the lower end of the vertical partition. The vertical partition is arranged vertically along the boundary between the first combustion section and the second combustion section. The horizontal partition has a plurality of ventilation holes that connect the first ventilation chamber and the second ventilation chamber.

[0009] Preferably, the second combustion section is disposed below the first combustion section.

[0010] Preferably, the blower combustion mechanism is a blower.

[0011] Preferably, the ignition mechanism is located directly below the feed port.

[0012] Preferably, the first blowing hole is inclined from the bottom of the first combustion section toward the second combustion section.

[0013] Preferably, the lengths of the first combustion section and the second combustion section are equal.

[0014] Preferably, the first sprocket is connected to the second and third sprockets via a chain.

[0015] Preferably, the diameter of the ventilation hole is smaller than the diameter of the first blowing hole.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a biomass combustion furnace, comprising a furnace body, a staged combustion mechanism, an ignition mechanism, and a separating mechanism built into the combustion body, and a blower combustion-aiding mechanism located outside the furnace body. The staged combustion mechanism is located below the feed inlet, and a ventilation chamber is formed between the staged combustion mechanism and the bottom plate of the furnace body. The staged combustion mechanism includes a first combustion section and a second combustion section. The separating mechanism divides the ventilation chamber into a first ventilation chamber and a second ventilation chamber, and the separating mechanism has ventilation holes connecting the first and second ventilation chambers. The first combustion section has a first blowing hole connecting to the first ventilation chamber, and the second combustion section has a second blowing hole connecting to the second ventilation chamber with a diameter smaller than the first blowing hole. This application achieves zoned combustion, which can reduce biomass pellet coking, making the staged combustion mechanism cleaner, while also reducing blown-up ash, preventing blockage of the heat exchange tubes located at the top of the furnace body, and improving combustion quality and efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a front view of the overall structure in one embodiment of the present invention; Figure 2 This is a top view of the overall structure in one embodiment of the present invention; Figure 3 This is an isometric view of the overall structure in one embodiment of the present invention.

[0019] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0020] Explanation of icon numbers: 10. Combustion furnace body; 20. Staged combustion mechanism; 210. First combustion section; 220. First blowing hole; 230. Second combustion section; 240. Second blowing hole; 250. Ventilation chamber; 251. First ventilation chamber; 252. Second ventilation chamber; 30. Ignition mechanism; 40. Separation mechanism; 410. Horizontal partition; 420. Vertical partition; 430. Ventilation hole; 50. Blower combustion mechanism; 60. First feeding mechanism; 610. First outer shell; 620. First helical blade shaft; 630. First feed opening; 640. Second sprocket; 70. Second feeding mechanism; 710. Second outer shell; 720. Second helical blade shaft; 730. Second discharge opening; 740. Third sprocket; 750. Feeding channel; 80. Biomass fuel. Detailed Implementation

[0021] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0024] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions 1 is contradictory or cannot be implemented, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0025] Please see the appendix Figure 1-3 A biomass combustion furnace according to one embodiment of the present invention includes a combustion furnace body 10, a staged combustion mechanism 20, an ignition mechanism 30, and a separation mechanism 40 built into the combustion furnace body, and a blower combustion-aiding mechanism 50 located outside the combustion furnace body 10; wherein, The combustion furnace body 10 has a feed hole (not shown in the figure), a slag discharge hole (not shown in the figure), and a connecting hole (not shown in the figure) that matches the blower combustion mechanism 50. The ignition mechanism 30 is used to ignite the biomass fuel 80 from the feed port; The staged combustion mechanism 20 is located below the feed inlet and is fixedly connected to the inner wall of the combustion furnace body 10. A ventilation chamber 250 is formed between the staged combustion mechanism 20 and the bottom plate of the combustion furnace body 10. The staged combustion mechanism 20 includes a first combustion section 210 and a second combustion section 230 connected to each other for biomass fuel 80 to be burned on the bed. The first combustion section 210 is located close to the feed inlet, and the second combustion section is located away from the feed inlet. For example, the first combustion section 210 and the second combustion section 230 can be a grate known to those skilled in the art, and the grate has multiple through holes for air circulation and dust falling off.

[0026] The partitioning mechanism 40 is disposed within the ventilation chamber 250, dividing the ventilation chamber 250 into a first ventilation chamber 251 corresponding to the first combustion section 210 and a second ventilation chamber 252 corresponding to the second combustion section 230. The partitioning mechanism 40 has a ventilation hole 430 connecting the first ventilation chamber 251 and the second ventilation chamber 252. The blower combustion mechanism 50 is connected to the first ventilation chamber 251 through the ventilation hole 430. The first combustion section 210 has a first blowing hole 220 connecting to the first ventilation chamber 251, and the second combustion section 230 has a second blowing hole 240 connecting to the second ventilation chamber 252 with a smaller diameter than the first blowing hole 220.

[0027] The slag discharge hole can be used to periodically clean the fuel dust located in the ventilation chamber 250.

[0028] Workflow: Please refer to again Figure 1 In this diagram, the small arrows corresponding to the blower combustion mechanism 50 represent the airflow direction. Biomass fuel 80 enters the combustion furnace body 10 through the feed hole. The ignition mechanism 30 ignites the biomass fuel 80 from the feed hole. The biomass fuel 80 first falls into the first combustion section 210 and burns. The air supply end of the blower combustion mechanism 50 enters the first ventilation chamber 251 through the connecting hole. The air entering the first ventilation chamber 251 is divided into two streams. One stream is blown through the first blowing hole 220 to the first combustion section 210 to assist the combustion of the biomass fuel 80 located in the first combustion section 210. The other stream enters the second ventilation chamber 252 through the ventilation hole 430. The air entering the second ventilation chamber 252 is blown through the second blowing hole 240 to the second combustion section 230 to assist the combustion of the biomass fuel 80 located in the second combustion section 230.

[0029] It is understandable that the first combustion section 210 is located near the feed port. The biomass fuel 80 entering the combustion furnace body 10 will first fall to the first combustion section 210. After a period of combustion, the particles of the biomass fuel 80 will become smaller. When the weight of the burning biomass fuel 80 is less than the air force from the first blowing port 220, the biomass fuel 80 will be blown up and enter the second combustion section 230 to continue burning. Since the aperture of the second blowing port 240 is smaller than that of the first blowing port 220, the second combustion section 230 can allow the smaller biomass fuel 80 particles to continue burning. This application achieves zoned combustion, which can reduce biomass particle coking, making the first combustion section 210 and the second combustion section 230 cleaner. At the same time, it can also reduce the amount of ash blown up and prevent the heat exchange tubes (not shown) located at the top of the combustion furnace body 10 from becoming clogged.

[0030] In a preferred embodiment of the present invention, a material conveying mechanism (not shown in the figure) is further included. The material conveying mechanism includes a drive motor (not shown in the figure), a first feeding mechanism 60 and a second feeding mechanism 70 that are drively connected to the drive motor. The output shaft of the drive motor is equipped with a first sprocket (not shown in the figure). The first feeding mechanism 60 includes a cylindrical first housing 610 and a first helical blade shaft 620 rotatably disposed within the first housing 610. The first helical blade shaft 620 includes a first driving end and a first discharging end disposed opposite to each other. The first driving end of the first helical blade shaft 620 extends out of the first housing 610, and a second sprocket 640 is fixed on the first driving end. The top of the first housing 610 has a first feeding opening 630 on the side near the first driving end, and the bottom of the first housing 610 has a first discharging opening (not shown in the figure) on the side near the first discharging end. The second feeding mechanism 70 is disposed below the first feeding mechanism 60, and includes a cylindrical second housing 710 and a second helical blade shaft 720 rotatably disposed within the second housing 710. The second helical blade shaft 720 includes a second driving end and a second discharge end disposed opposite to each other. The second driving end of the second helical blade shaft 720 extends out of the second housing 710, and a third sprocket 740 is fixed on the second driving end. A second feeding opening (not shown in the figure) is formed on the top of the second housing 710 near the second driving end. A second discharge opening 730 communicating with the feeding hole is opened near the second discharge end of the second housing 710. The second feeding opening and the first discharge opening are connected by a feeding channel 750.

[0031] Working process: Biomass fuel 80 enters the first outer shell 610 through the first feed opening 630. The drive motor drives the first sprocket to rotate, which in turn drives the second sprocket 640, which in turn drives the first spiral blade shaft 620 to rotate. This transfers the biomass fuel 80 from the first feed opening 630 to the first discharge opening. Then, it enters the second outer shell 710 through the second feed opening via the feeding channel 750. The drive motor can be configured to synchronously drive the third sprocket 740 to rotate, which in turn drives the second spiral blade shaft 720 to rotate. This transfers the biomass fuel 80 from the second feed opening to the second discharge opening 730, and then sends it through the feed hole into the interior of the combustion furnace body 10 for combustion.

[0032] In a preferred embodiment, the partitioning mechanism 40 includes a horizontal partition 410 and a vertical partition 420 connected to each other. The horizontal partition 410 is arranged horizontally directly below the first combustion section 210. One end of the horizontal partition 410 is connected to the inner wall of the combustion furnace body 10, and the other end is connected to the lower end of the vertical partition 420. The vertical partition 420 is arranged vertically along the boundary between the first combustion section 210 and the second combustion section 230. The horizontal partition 410 has a plurality of ventilation holes 430 that connect the first ventilation chamber 251 and the second ventilation chamber 252.

[0033] Furthermore, the second combustion section 230 is positioned lower than the first combustion section 210. In this embodiment, by positioning the second combustion section 230 lower than the first combustion section 210, the biomass fuel 80 from the first combustion section 210 can be better placed on the bed for secondary combustion.

[0034] Furthermore, the blower-assisted combustion mechanism 50 is a blower. Blowers are characterized by stable operation, minimal vibration, large air volume, and are readily available in actual production.

[0035] Furthermore, the ignition mechanism 30 is located directly below the feed hole. In other embodiments, those skilled in the art may place the ignition mechanism 30 in other locations, but it is necessary to ensure that the ignition mechanism 30 can ignite the biomass fuel 80 entering the combustion furnace body 10. The specific type of the ignition mechanism 30 can be selected according to actual needs, for example, a silicon nitride ignition rod can be used.

[0036] In a preferred embodiment, the first blowing hole 220 is inclined from the bottom of the first combustion section 210 toward the second combustion section 230. In this embodiment, by inclining the first blowing hole 220 and ensuring that the blowing direction of the first blowing hole 220 is inclined toward the second combustion section 230, it is possible to blow the biomass fuel into the second combustion section 230 for further combustion after the biomass has burned to a certain particle size, that is, when the weight of the biomass fuel 80 is less than the wind force of the first blowing hole 220, thereby improving the degree of combustion.

[0037] Furthermore, the lengths of the first combustion section 210 and the second combustion section 230 are equal. It is understood that in other embodiments, the lengths of the first combustion section 210 and the second combustion section 230 can be adaptively adjusted according to actual needs.

[0038] In another preferred embodiment, the first sprocket is connected to the second sprocket 640 and the third sprocket 740 via a chain. The first sprocket, driven by the output shaft of the drive motor, simultaneously drives the second sprocket 640 and the third sprocket 740 to rotate via the chain, thereby simultaneously driving the first helical blade shaft 620 and the second helical blade shaft 720 to rotate. Compared with the traditional single-drive method, this improves the compactness of the structure, significantly enhances the linkage, and makes it more stable and reliable.

[0039] Furthermore, the diameter of the ventilation hole 430 is smaller than that of the first blowing hole 220. This arrangement allows more air from the blower combustion mechanism 50 to be blown towards the first combustion section 210, ensuring the combustion of the large-diameter biomass fuel 80 in the first combustion section 210.

[0040] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A biomass combustion furnace, characterized by, It includes a combustion furnace body, a staged combustion mechanism, an ignition mechanism, and a separation mechanism built into the combustion furnace body, and a blower combustion-aiding mechanism located outside the combustion furnace body; wherein, The combustion furnace body has a feed hole, a slag discharge hole, and a connecting hole that matches the blower combustion mechanism; The ignition mechanism is used to ignite the biomass fuel from the feed port; The staged combustion mechanism is located below the feed hole. The staged combustion mechanism is fixedly connected to the inner wall of the combustion furnace body. A ventilation chamber is formed between the staged combustion mechanism and the bottom plate of the combustion furnace body. The staged combustion mechanism includes a first combustion section and a second combustion section connected to each other for biomass fuel to be bed-burned. The first combustion section is located close to the feed hole, and the second combustion section is located away from the feed hole. The partitioning mechanism is disposed in the ventilation chamber, and the partitioning mechanism divides the ventilation chamber into a first ventilation chamber corresponding to the first combustion section and a second ventilation chamber corresponding to the second combustion section; the partitioning mechanism has a ventilation hole connecting the first ventilation chamber and the second ventilation chamber; the blower combustion mechanism is connected to the first ventilation chamber through the connecting hole; the first combustion section has a first blowing hole connecting to the first ventilation chamber, and the second combustion section has a second blowing hole connecting to the second ventilation chamber with a diameter smaller than the first blowing hole; The first blowing hole is used to blow air from the first ventilation chamber toward the biomass fuel located on the first combustion section, and to move the biomass fuel toward the second combustion section; The second blowing hole is used to blow air from the first ventilation chamber into the second ventilation chamber through the ventilation hole toward the second combustion section; The partitioning mechanism includes interconnected horizontal and vertical partitions. The horizontal partition is arranged horizontally directly below the first combustion section. One end of the horizontal partition is connected to the inner wall of the combustion furnace body, and the other end is connected to the lower end of the vertical partition. The vertical partition is arranged vertically along the boundary between the first combustion section and the second combustion section. The horizontal partition has a plurality of ventilation holes that connect the first ventilation chamber and the second ventilation chamber. The first blowing hole is inclined from the bottom of the first combustion section toward the second combustion section; The diameter of the ventilation hole is smaller than the diameter of the first blowing hole.

2. The biomass combustion furnace according to claim 1, characterized by It also includes a material conveying mechanism, which comprises a drive motor, a first feeding mechanism and a second feeding mechanism that are drively connected to the drive motor, wherein... The output shaft of the drive motor is provided with a first sprocket; The first feeding mechanism includes a cylindrical first housing and a first helical blade shaft rotatably disposed within the first housing; the first helical blade shaft includes a first driving end and a first discharging end disposed opposite to each other, the first driving end of the first helical blade shaft extends out of the first housing, and a second sprocket is fixed on the first driving end; the top of the first housing has a first feeding opening on the side near the first driving end, and the bottom of the first housing has a first discharging opening on the side near the first discharging end; The second feeding mechanism is located below the first feeding mechanism and includes a cylindrical second outer shell and a second helical blade shaft rotatably disposed within the second outer shell. The second helical blade shaft includes a second driving end and a second discharge end disposed opposite to each other. The second driving end of the second helical blade shaft extends out of the second outer shell, and a third sprocket is fixed on the second driving end. A second feeding opening is formed on the top of the second outer shell on the side near the second driving end. A second discharge opening communicating with the feeding hole is opened on the second outer shell near the second discharge end. The second feeding opening and the first discharge opening are connected by a feeding channel.

3. The biomass combustion furnace according to claim 1, characterized in that, The second combustion section is positioned lower than the first combustion section.

4. The biomass combustion furnace according to claim 1, characterized in that, The blower-assisted combustion mechanism is a blower.

5. The biomass combustion furnace according to claim 1, characterized in that, The ignition mechanism is located directly below the feed port.

6. The biomass combustion furnace according to claim 1, characterized in that, The first combustion section and the second combustion section have the same length.

7. The biomass combustion furnace according to claim 2, characterized in that, The first sprocket is connected to the second and third sprockets via a chain.

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